WO2007122938A1 - 吸収体及びその製造方法 - Google Patents
吸収体及びその製造方法 Download PDFInfo
- Publication number
- WO2007122938A1 WO2007122938A1 PCT/JP2007/055564 JP2007055564W WO2007122938A1 WO 2007122938 A1 WO2007122938 A1 WO 2007122938A1 JP 2007055564 W JP2007055564 W JP 2007055564W WO 2007122938 A1 WO2007122938 A1 WO 2007122938A1
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- WO
- WIPO (PCT)
- Prior art keywords
- fiber
- fibers
- absorbent
- absorbent body
- web
- Prior art date
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Classifications
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- A—HUMAN NECESSITIES
- A61—MEDICAL OR VETERINARY SCIENCE; HYGIENE
- A61F—FILTERS IMPLANTABLE INTO BLOOD VESSELS; PROSTHESES; DEVICES PROVIDING PATENCY TO, OR PREVENTING COLLAPSING OF, TUBULAR STRUCTURES OF THE BODY, e.g. STENTS; ORTHOPAEDIC, NURSING OR CONTRACEPTIVE DEVICES; FOMENTATION; TREATMENT OR PROTECTION OF EYES OR EARS; BANDAGES, DRESSINGS OR ABSORBENT PADS; FIRST-AID KITS
- A61F13/00—Bandages or dressings; Absorbent pads
- A61F13/15—Absorbent pads, e.g. sanitary towels, swabs or tampons for external or internal application to the body; Supporting or fastening means therefor; Tampon applicators
- A61F13/53—Absorbent pads, e.g. sanitary towels, swabs or tampons for external or internal application to the body; Supporting or fastening means therefor; Tampon applicators characterised by the absorbing medium
- A61F13/531—Absorbent pads, e.g. sanitary towels, swabs or tampons for external or internal application to the body; Supporting or fastening means therefor; Tampon applicators characterised by the absorbing medium having a homogeneous composition through the thickness of the pad
-
- A—HUMAN NECESSITIES
- A61—MEDICAL OR VETERINARY SCIENCE; HYGIENE
- A61F—FILTERS IMPLANTABLE INTO BLOOD VESSELS; PROSTHESES; DEVICES PROVIDING PATENCY TO, OR PREVENTING COLLAPSING OF, TUBULAR STRUCTURES OF THE BODY, e.g. STENTS; ORTHOPAEDIC, NURSING OR CONTRACEPTIVE DEVICES; FOMENTATION; TREATMENT OR PROTECTION OF EYES OR EARS; BANDAGES, DRESSINGS OR ABSORBENT PADS; FIRST-AID KITS
- A61F13/00—Bandages or dressings; Absorbent pads
- A61F13/15—Absorbent pads, e.g. sanitary towels, swabs or tampons for external or internal application to the body; Supporting or fastening means therefor; Tampon applicators
-
- A—HUMAN NECESSITIES
- A61—MEDICAL OR VETERINARY SCIENCE; HYGIENE
- A61F—FILTERS IMPLANTABLE INTO BLOOD VESSELS; PROSTHESES; DEVICES PROVIDING PATENCY TO, OR PREVENTING COLLAPSING OF, TUBULAR STRUCTURES OF THE BODY, e.g. STENTS; ORTHOPAEDIC, NURSING OR CONTRACEPTIVE DEVICES; FOMENTATION; TREATMENT OR PROTECTION OF EYES OR EARS; BANDAGES, DRESSINGS OR ABSORBENT PADS; FIRST-AID KITS
- A61F13/00—Bandages or dressings; Absorbent pads
- A61F13/15—Absorbent pads, e.g. sanitary towels, swabs or tampons for external or internal application to the body; Supporting or fastening means therefor; Tampon applicators
- A61F13/15577—Apparatus or processes for manufacturing
- A61F13/15617—Making absorbent pads from fibres or pulverulent material with or without treatment of the fibres
- A61F13/15658—Forming continuous, e.g. composite, fibrous webs, e.g. involving the application of pulverulent material on parts thereof
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- A—HUMAN NECESSITIES
- A61—MEDICAL OR VETERINARY SCIENCE; HYGIENE
- A61F—FILTERS IMPLANTABLE INTO BLOOD VESSELS; PROSTHESES; DEVICES PROVIDING PATENCY TO, OR PREVENTING COLLAPSING OF, TUBULAR STRUCTURES OF THE BODY, e.g. STENTS; ORTHOPAEDIC, NURSING OR CONTRACEPTIVE DEVICES; FOMENTATION; TREATMENT OR PROTECTION OF EYES OR EARS; BANDAGES, DRESSINGS OR ABSORBENT PADS; FIRST-AID KITS
- A61F13/00—Bandages or dressings; Absorbent pads
- A61F13/15—Absorbent pads, e.g. sanitary towels, swabs or tampons for external or internal application to the body; Supporting or fastening means therefor; Tampon applicators
- A61F13/45—Absorbent pads, e.g. sanitary towels, swabs or tampons for external or internal application to the body; Supporting or fastening means therefor; Tampon applicators characterised by the shape
- A61F13/49—Absorbent articles specially adapted to be worn around the waist, e.g. diapers
-
- A—HUMAN NECESSITIES
- A61—MEDICAL OR VETERINARY SCIENCE; HYGIENE
- A61F—FILTERS IMPLANTABLE INTO BLOOD VESSELS; PROSTHESES; DEVICES PROVIDING PATENCY TO, OR PREVENTING COLLAPSING OF, TUBULAR STRUCTURES OF THE BODY, e.g. STENTS; ORTHOPAEDIC, NURSING OR CONTRACEPTIVE DEVICES; FOMENTATION; TREATMENT OR PROTECTION OF EYES OR EARS; BANDAGES, DRESSINGS OR ABSORBENT PADS; FIRST-AID KITS
- A61F13/00—Bandages or dressings; Absorbent pads
- A61F13/15—Absorbent pads, e.g. sanitary towels, swabs or tampons for external or internal application to the body; Supporting or fastening means therefor; Tampon applicators
- A61F13/53—Absorbent pads, e.g. sanitary towels, swabs or tampons for external or internal application to the body; Supporting or fastening means therefor; Tampon applicators characterised by the absorbing medium
-
- A—HUMAN NECESSITIES
- A61—MEDICAL OR VETERINARY SCIENCE; HYGIENE
- A61F—FILTERS IMPLANTABLE INTO BLOOD VESSELS; PROSTHESES; DEVICES PROVIDING PATENCY TO, OR PREVENTING COLLAPSING OF, TUBULAR STRUCTURES OF THE BODY, e.g. STENTS; ORTHOPAEDIC, NURSING OR CONTRACEPTIVE DEVICES; FOMENTATION; TREATMENT OR PROTECTION OF EYES OR EARS; BANDAGES, DRESSINGS OR ABSORBENT PADS; FIRST-AID KITS
- A61F13/00—Bandages or dressings; Absorbent pads
- A61F13/15—Absorbent pads, e.g. sanitary towels, swabs or tampons for external or internal application to the body; Supporting or fastening means therefor; Tampon applicators
- A61F13/53—Absorbent pads, e.g. sanitary towels, swabs or tampons for external or internal application to the body; Supporting or fastening means therefor; Tampon applicators characterised by the absorbing medium
- A61F13/531—Absorbent pads, e.g. sanitary towels, swabs or tampons for external or internal application to the body; Supporting or fastening means therefor; Tampon applicators characterised by the absorbing medium having a homogeneous composition through the thickness of the pad
- A61F13/532—Absorbent pads, e.g. sanitary towels, swabs or tampons for external or internal application to the body; Supporting or fastening means therefor; Tampon applicators characterised by the absorbing medium having a homogeneous composition through the thickness of the pad inhomogeneous in the plane of the pad
- A61F13/5323—Absorbent pads, e.g. sanitary towels, swabs or tampons for external or internal application to the body; Supporting or fastening means therefor; Tampon applicators characterised by the absorbing medium having a homogeneous composition through the thickness of the pad inhomogeneous in the plane of the pad having absorbent material located in discrete regions, e.g. pockets
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- A—HUMAN NECESSITIES
- A61—MEDICAL OR VETERINARY SCIENCE; HYGIENE
- A61F—FILTERS IMPLANTABLE INTO BLOOD VESSELS; PROSTHESES; DEVICES PROVIDING PATENCY TO, OR PREVENTING COLLAPSING OF, TUBULAR STRUCTURES OF THE BODY, e.g. STENTS; ORTHOPAEDIC, NURSING OR CONTRACEPTIVE DEVICES; FOMENTATION; TREATMENT OR PROTECTION OF EYES OR EARS; BANDAGES, DRESSINGS OR ABSORBENT PADS; FIRST-AID KITS
- A61F13/00—Bandages or dressings; Absorbent pads
- A61F13/15—Absorbent pads, e.g. sanitary towels, swabs or tampons for external or internal application to the body; Supporting or fastening means therefor; Tampon applicators
- A61F13/53—Absorbent pads, e.g. sanitary towels, swabs or tampons for external or internal application to the body; Supporting or fastening means therefor; Tampon applicators characterised by the absorbing medium
- A61F13/531—Absorbent pads, e.g. sanitary towels, swabs or tampons for external or internal application to the body; Supporting or fastening means therefor; Tampon applicators characterised by the absorbing medium having a homogeneous composition through the thickness of the pad
- A61F13/532—Absorbent pads, e.g. sanitary towels, swabs or tampons for external or internal application to the body; Supporting or fastening means therefor; Tampon applicators characterised by the absorbing medium having a homogeneous composition through the thickness of the pad inhomogeneous in the plane of the pad
- A61F13/533—Absorbent pads, e.g. sanitary towels, swabs or tampons for external or internal application to the body; Supporting or fastening means therefor; Tampon applicators characterised by the absorbing medium having a homogeneous composition through the thickness of the pad inhomogeneous in the plane of the pad having discontinuous areas of compression
-
- A—HUMAN NECESSITIES
- A61—MEDICAL OR VETERINARY SCIENCE; HYGIENE
- A61F—FILTERS IMPLANTABLE INTO BLOOD VESSELS; PROSTHESES; DEVICES PROVIDING PATENCY TO, OR PREVENTING COLLAPSING OF, TUBULAR STRUCTURES OF THE BODY, e.g. STENTS; ORTHOPAEDIC, NURSING OR CONTRACEPTIVE DEVICES; FOMENTATION; TREATMENT OR PROTECTION OF EYES OR EARS; BANDAGES, DRESSINGS OR ABSORBENT PADS; FIRST-AID KITS
- A61F13/00—Bandages or dressings; Absorbent pads
- A61F13/15—Absorbent pads, e.g. sanitary towels, swabs or tampons for external or internal application to the body; Supporting or fastening means therefor; Tampon applicators
- A61F13/53—Absorbent pads, e.g. sanitary towels, swabs or tampons for external or internal application to the body; Supporting or fastening means therefor; Tampon applicators characterised by the absorbing medium
- A61F13/534—Absorbent pads, e.g. sanitary towels, swabs or tampons for external or internal application to the body; Supporting or fastening means therefor; Tampon applicators characterised by the absorbing medium having an inhomogeneous composition through the thickness of the pad
- A61F13/53409—Absorbent pads, e.g. sanitary towels, swabs or tampons for external or internal application to the body; Supporting or fastening means therefor; Tampon applicators characterised by the absorbing medium having an inhomogeneous composition through the thickness of the pad having a folded core
- A61F13/53418—Absorbent pads, e.g. sanitary towels, swabs or tampons for external or internal application to the body; Supporting or fastening means therefor; Tampon applicators characterised by the absorbing medium having an inhomogeneous composition through the thickness of the pad having a folded core having a C-folded cross-section
-
- A—HUMAN NECESSITIES
- A61—MEDICAL OR VETERINARY SCIENCE; HYGIENE
- A61F—FILTERS IMPLANTABLE INTO BLOOD VESSELS; PROSTHESES; DEVICES PROVIDING PATENCY TO, OR PREVENTING COLLAPSING OF, TUBULAR STRUCTURES OF THE BODY, e.g. STENTS; ORTHOPAEDIC, NURSING OR CONTRACEPTIVE DEVICES; FOMENTATION; TREATMENT OR PROTECTION OF EYES OR EARS; BANDAGES, DRESSINGS OR ABSORBENT PADS; FIRST-AID KITS
- A61F13/00—Bandages or dressings; Absorbent pads
- A61F13/15—Absorbent pads, e.g. sanitary towels, swabs or tampons for external or internal application to the body; Supporting or fastening means therefor; Tampon applicators
- A61F13/53—Absorbent pads, e.g. sanitary towels, swabs or tampons for external or internal application to the body; Supporting or fastening means therefor; Tampon applicators characterised by the absorbing medium
- A61F13/534—Absorbent pads, e.g. sanitary towels, swabs or tampons for external or internal application to the body; Supporting or fastening means therefor; Tampon applicators characterised by the absorbing medium having an inhomogeneous composition through the thickness of the pad
- A61F13/535—Absorbent pads, e.g. sanitary towels, swabs or tampons for external or internal application to the body; Supporting or fastening means therefor; Tampon applicators characterised by the absorbing medium having an inhomogeneous composition through the thickness of the pad inhomogeneous in the plane of the pad, e.g. core absorbent layers being of different sizes
-
- A—HUMAN NECESSITIES
- A61—MEDICAL OR VETERINARY SCIENCE; HYGIENE
- A61F—FILTERS IMPLANTABLE INTO BLOOD VESSELS; PROSTHESES; DEVICES PROVIDING PATENCY TO, OR PREVENTING COLLAPSING OF, TUBULAR STRUCTURES OF THE BODY, e.g. STENTS; ORTHOPAEDIC, NURSING OR CONTRACEPTIVE DEVICES; FOMENTATION; TREATMENT OR PROTECTION OF EYES OR EARS; BANDAGES, DRESSINGS OR ABSORBENT PADS; FIRST-AID KITS
- A61F13/00—Bandages or dressings; Absorbent pads
- A61F13/15—Absorbent pads, e.g. sanitary towels, swabs or tampons for external or internal application to the body; Supporting or fastening means therefor; Tampon applicators
- A61F13/53—Absorbent pads, e.g. sanitary towels, swabs or tampons for external or internal application to the body; Supporting or fastening means therefor; Tampon applicators characterised by the absorbing medium
- A61F2013/530131—Absorbent pads, e.g. sanitary towels, swabs or tampons for external or internal application to the body; Supporting or fastening means therefor; Tampon applicators characterised by the absorbing medium being made in fibre but being not pulp
- A61F2013/530138—Absorbent pads, e.g. sanitary towels, swabs or tampons for external or internal application to the body; Supporting or fastening means therefor; Tampon applicators characterised by the absorbing medium being made in fibre but being not pulp characterized by the fibre length
- A61F2013/530145—Absorbent pads, e.g. sanitary towels, swabs or tampons for external or internal application to the body; Supporting or fastening means therefor; Tampon applicators characterised by the absorbing medium being made in fibre but being not pulp characterized by the fibre length being short
-
- A—HUMAN NECESSITIES
- A61—MEDICAL OR VETERINARY SCIENCE; HYGIENE
- A61F—FILTERS IMPLANTABLE INTO BLOOD VESSELS; PROSTHESES; DEVICES PROVIDING PATENCY TO, OR PREVENTING COLLAPSING OF, TUBULAR STRUCTURES OF THE BODY, e.g. STENTS; ORTHOPAEDIC, NURSING OR CONTRACEPTIVE DEVICES; FOMENTATION; TREATMENT OR PROTECTION OF EYES OR EARS; BANDAGES, DRESSINGS OR ABSORBENT PADS; FIRST-AID KITS
- A61F13/00—Bandages or dressings; Absorbent pads
- A61F13/15—Absorbent pads, e.g. sanitary towels, swabs or tampons for external or internal application to the body; Supporting or fastening means therefor; Tampon applicators
- A61F13/53—Absorbent pads, e.g. sanitary towels, swabs or tampons for external or internal application to the body; Supporting or fastening means therefor; Tampon applicators characterised by the absorbing medium
- A61F2013/530131—Absorbent pads, e.g. sanitary towels, swabs or tampons for external or internal application to the body; Supporting or fastening means therefor; Tampon applicators characterised by the absorbing medium being made in fibre but being not pulp
- A61F2013/530138—Absorbent pads, e.g. sanitary towels, swabs or tampons for external or internal application to the body; Supporting or fastening means therefor; Tampon applicators characterised by the absorbing medium being made in fibre but being not pulp characterized by the fibre length
- A61F2013/530153—Absorbent pads, e.g. sanitary towels, swabs or tampons for external or internal application to the body; Supporting or fastening means therefor; Tampon applicators characterised by the absorbing medium being made in fibre but being not pulp characterized by the fibre length being long
-
- A—HUMAN NECESSITIES
- A61—MEDICAL OR VETERINARY SCIENCE; HYGIENE
- A61F—FILTERS IMPLANTABLE INTO BLOOD VESSELS; PROSTHESES; DEVICES PROVIDING PATENCY TO, OR PREVENTING COLLAPSING OF, TUBULAR STRUCTURES OF THE BODY, e.g. STENTS; ORTHOPAEDIC, NURSING OR CONTRACEPTIVE DEVICES; FOMENTATION; TREATMENT OR PROTECTION OF EYES OR EARS; BANDAGES, DRESSINGS OR ABSORBENT PADS; FIRST-AID KITS
- A61F13/00—Bandages or dressings; Absorbent pads
- A61F13/15—Absorbent pads, e.g. sanitary towels, swabs or tampons for external or internal application to the body; Supporting or fastening means therefor; Tampon applicators
- A61F13/53—Absorbent pads, e.g. sanitary towels, swabs or tampons for external or internal application to the body; Supporting or fastening means therefor; Tampon applicators characterised by the absorbing medium
- A61F2013/530131—Absorbent pads, e.g. sanitary towels, swabs or tampons for external or internal application to the body; Supporting or fastening means therefor; Tampon applicators characterised by the absorbing medium being made in fibre but being not pulp
- A61F2013/530343—Absorbent pads, e.g. sanitary towels, swabs or tampons for external or internal application to the body; Supporting or fastening means therefor; Tampon applicators characterised by the absorbing medium being made in fibre but being not pulp being natural fibres
-
- A—HUMAN NECESSITIES
- A61—MEDICAL OR VETERINARY SCIENCE; HYGIENE
- A61F—FILTERS IMPLANTABLE INTO BLOOD VESSELS; PROSTHESES; DEVICES PROVIDING PATENCY TO, OR PREVENTING COLLAPSING OF, TUBULAR STRUCTURES OF THE BODY, e.g. STENTS; ORTHOPAEDIC, NURSING OR CONTRACEPTIVE DEVICES; FOMENTATION; TREATMENT OR PROTECTION OF EYES OR EARS; BANDAGES, DRESSINGS OR ABSORBENT PADS; FIRST-AID KITS
- A61F13/00—Bandages or dressings; Absorbent pads
- A61F13/15—Absorbent pads, e.g. sanitary towels, swabs or tampons for external or internal application to the body; Supporting or fastening means therefor; Tampon applicators
- A61F13/53—Absorbent pads, e.g. sanitary towels, swabs or tampons for external or internal application to the body; Supporting or fastening means therefor; Tampon applicators characterised by the absorbing medium
- A61F2013/530481—Absorbent pads, e.g. sanitary towels, swabs or tampons for external or internal application to the body; Supporting or fastening means therefor; Tampon applicators characterised by the absorbing medium having superabsorbent materials, i.e. highly absorbent polymer gel materials
- A61F2013/53051—Absorbent pads, e.g. sanitary towels, swabs or tampons for external or internal application to the body; Supporting or fastening means therefor; Tampon applicators characterised by the absorbing medium having superabsorbent materials, i.e. highly absorbent polymer gel materials being only in particular parts or specially arranged
-
- A—HUMAN NECESSITIES
- A61—MEDICAL OR VETERINARY SCIENCE; HYGIENE
- A61F—FILTERS IMPLANTABLE INTO BLOOD VESSELS; PROSTHESES; DEVICES PROVIDING PATENCY TO, OR PREVENTING COLLAPSING OF, TUBULAR STRUCTURES OF THE BODY, e.g. STENTS; ORTHOPAEDIC, NURSING OR CONTRACEPTIVE DEVICES; FOMENTATION; TREATMENT OR PROTECTION OF EYES OR EARS; BANDAGES, DRESSINGS OR ABSORBENT PADS; FIRST-AID KITS
- A61F13/00—Bandages or dressings; Absorbent pads
- A61F13/15—Absorbent pads, e.g. sanitary towels, swabs or tampons for external or internal application to the body; Supporting or fastening means therefor; Tampon applicators
- A61F13/53—Absorbent pads, e.g. sanitary towels, swabs or tampons for external or internal application to the body; Supporting or fastening means therefor; Tampon applicators characterised by the absorbing medium
- A61F2013/530481—Absorbent pads, e.g. sanitary towels, swabs or tampons for external or internal application to the body; Supporting or fastening means therefor; Tampon applicators characterised by the absorbing medium having superabsorbent materials, i.e. highly absorbent polymer gel materials
- A61F2013/53051—Absorbent pads, e.g. sanitary towels, swabs or tampons for external or internal application to the body; Supporting or fastening means therefor; Tampon applicators characterised by the absorbing medium having superabsorbent materials, i.e. highly absorbent polymer gel materials being only in particular parts or specially arranged
- A61F2013/530518—Absorbent pads, e.g. sanitary towels, swabs or tampons for external or internal application to the body; Supporting or fastening means therefor; Tampon applicators characterised by the absorbing medium having superabsorbent materials, i.e. highly absorbent polymer gel materials being only in particular parts or specially arranged the maximum being at the crotch
-
- A—HUMAN NECESSITIES
- A61—MEDICAL OR VETERINARY SCIENCE; HYGIENE
- A61F—FILTERS IMPLANTABLE INTO BLOOD VESSELS; PROSTHESES; DEVICES PROVIDING PATENCY TO, OR PREVENTING COLLAPSING OF, TUBULAR STRUCTURES OF THE BODY, e.g. STENTS; ORTHOPAEDIC, NURSING OR CONTRACEPTIVE DEVICES; FOMENTATION; TREATMENT OR PROTECTION OF EYES OR EARS; BANDAGES, DRESSINGS OR ABSORBENT PADS; FIRST-AID KITS
- A61F13/00—Bandages or dressings; Absorbent pads
- A61F13/15—Absorbent pads, e.g. sanitary towels, swabs or tampons for external or internal application to the body; Supporting or fastening means therefor; Tampon applicators
- A61F13/53—Absorbent pads, e.g. sanitary towels, swabs or tampons for external or internal application to the body; Supporting or fastening means therefor; Tampon applicators characterised by the absorbing medium
- A61F2013/530481—Absorbent pads, e.g. sanitary towels, swabs or tampons for external or internal application to the body; Supporting or fastening means therefor; Tampon applicators characterised by the absorbing medium having superabsorbent materials, i.e. highly absorbent polymer gel materials
- A61F2013/530583—Absorbent pads, e.g. sanitary towels, swabs or tampons for external or internal application to the body; Supporting or fastening means therefor; Tampon applicators characterised by the absorbing medium having superabsorbent materials, i.e. highly absorbent polymer gel materials characterized by the form
- A61F2013/530591—Absorbent pads, e.g. sanitary towels, swabs or tampons for external or internal application to the body; Supporting or fastening means therefor; Tampon applicators characterised by the absorbing medium having superabsorbent materials, i.e. highly absorbent polymer gel materials characterized by the form in granules or particles
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- Y—GENERAL TAGGING OF NEW TECHNOLOGICAL DEVELOPMENTS; GENERAL TAGGING OF CROSS-SECTIONAL TECHNOLOGIES SPANNING OVER SEVERAL SECTIONS OF THE IPC; TECHNICAL SUBJECTS COVERED BY FORMER USPC CROSS-REFERENCE ART COLLECTIONS [XRACs] AND DIGESTS
- Y10—TECHNICAL SUBJECTS COVERED BY FORMER USPC
- Y10T—TECHNICAL SUBJECTS COVERED BY FORMER US CLASSIFICATION
- Y10T29/00—Metal working
- Y10T29/49—Method of mechanical manufacture
- Y10T29/49826—Assembling or joining
Definitions
- the present invention relates to an absorbent body preferably used for various absorbent articles such as disposable diapers, sanitary napkins, incontinence pads and the like, and a method for producing the same. Furthermore, this invention relates to the series article provided with this absorber.
- Absorbents for absorbent articles using continuous filament spread tows are known.
- an absorbent body comprising a tow layer of crimpable acetate fibers and a powder frame pulp layer laminated on one side of this layer, wherein both layers are integrated with a press in the thickness direction of the absorbent body
- Patent Document 1 an absorbent body comprising a tow layer of crimpable acetate fibers and a powder frame pulp layer laminated on one side of this layer, wherein both layers are integrated with a press in the thickness direction of the absorbent body
- Patent Document 1 According to this absorber, it is said that the diffusibility of body fluid is improved.
- acetate fiber is inferior in water absorption capacity to pulp, a large amount of pulverized pulp is used to increase the absorption capacity of this absorber. Must. As a result, the absorber becomes thick, the flexibility is lowered, and the wearing feeling of the absorbent article is lowered.
- the tow layer composed of continuous filaments is preferable from the viewpoint of spot absorbability when the liquid supplied to the skin contact surface is absorbed from a narrow range.
- the tow layer since a tow layer having acetate fiber strength is easily covered by a part of the tow layer, the tow layer is easily broken or distorted by the movement of the wearer. If the pulverized pulp layer is thick, breakage and twisting are prevented to some extent. However, in that case, the absorber becomes thick, the flexibility is lowered, and the wearing feeling of the absorbent article is lowered.
- the water-absorbing core is composed of an upper layer, a lower layer, and an absorbent layer located between both layers, and as the absorbent layer, a fiber layer also serving as a tuca of acetate fibers is disposed on a spray layer of a superabsorbent polymer.
- a fiber layer also serving as a tuca of acetate fibers is disposed on a spray layer of a superabsorbent polymer.
- a part of the superabsorbent polymer is bonded to the lower layer by an adhesive, and another part is contained in the fiber layer of the tow.
- this water absorbing core although a part of the superabsorbent polymer is accommodated in the fiber layer of the tow, most of the superabsorbent polymer is bonded to the lower layer.
- tow fiber There is a separate vascular layer and a spray layer of superabsorbent polymer.
- Patent Document 1 Japanese Patent Laid-Open No. 57-160457
- Patent Document 2 W099Z49826A1
- Patent Document 3 Japanese Patent Application Laid-Open No. 07-024003
- the present invention provides an absorbent body comprising a fiber assembly including long fibers and short fibers which are synthetic or semi-synthetic fibers.
- the present invention is an absorbent body having a long-fiber web and agglomerated particles contained in the web, wherein at least a part of the range in which the particles are distributed in a plane direction of the web.
- the present invention provides an absorbent body in which fibers are cut to produce a large number of short fibers.
- the present invention includes an absorbent body having a long fiber web and agglomerated particles contained in the web, wherein the long fiber is cut into a part of the web to produce a large number of short fibers.
- the production method of the present invention after agglomerated particles of a web of hydrophilic long fibers are sprayed, at least a part of a range in which the particles are dispersed is pressed in the thickness direction, and the long fibers in the part are The manufacturing method of an absorber is provided that is pressed against and cut.
- the present invention provides an absorbent article comprising the absorbent body, wherein the short fiber is present in a portion that is disposed to face the excretory part of the wearer when worn.
- the present invention comprises an absorbent core including a fibrous web, and the fibrous web is mainly composed of synthetic or semi-synthetic fibers, and the constituent fibers that are synthetic or semi-synthetic fibers are mixed with the absorbent.
- the first fiber group in which the ratio is less than 1Z4 the second fiber group in which the ratio is greater than or equal to 1Z4 and less than 2Z4, and the ratio is greater than or equal to 2Z4 and less than 3Z4
- it is divided into a third fiber group that is full and a fourth fiber group that has a ratio of 3Z4 or more, it contains fibers of three or more fiber groups of the first to fourth fiber groups
- An absorber is provided (hereinafter, the first invention is referred to as this invention).
- the present invention includes an absorbent core including a fibrous web, and the fibrous web is mainly composed of a synthetic or semi-synthetic fiber, and the constituent fiber that is a synthetic or semi-synthetic fiber is used as a fiber length.
- an absorbent body comprising fibers of three or more of the first to fourth fiber groups is provided (hereinafter referred to as the second invention). Sometimes it refers to this invention).
- the present invention is a method for producing an absorbent body according to the first, second, or second aspect of the present invention, comprising a cutting step of spraying particles on a long fiber web and then pressing the web in the thickness direction. In the cutting step, the long fibers are pressed against the particles, and cut into various lengths so that fibers of three or more fiber groups out of the first to fourth fiber groups are formed. It provides a method for manufacturing the absorber.
- the present invention is the method for manufacturing an absorbent body according to the first and second aspects of the invention or the second aspect of the invention, wherein the first cutting step of forming a plurality of first cut portions on the long fiber web, the first cut
- the present invention provides a method for manufacturing an absorbent body, comprising a second cutting step of forming a plurality of second cut portions in a pattern different from the first cut portion on the web in which the portions are formed.
- the present invention is the method for producing an absorbent body according to the first, second, or second invention, wherein a cutting member in which cutting protrusions are randomly arranged is pressed against a long fiber web, and the long fiber is
- the present invention also provides a method for producing an absorbent body, comprising a cutting step of cutting so as to produce fibers of various lengths.
- the present invention is an absorbent body comprising a web including short fibers and long fibers,
- the present invention provides an absorbent body that is oriented in one direction in the plane of the absorbent body and that has a degree of orientation of 1.2 or more of the entire constituent fibers of the web (hereinafter referred to as the third invention). It means invention).
- FIG. 1 is a partially cutaway perspective view showing an embodiment of an absorbent body according to the present invention.
- FIG. 2 is a schematic cross-sectional view showing a cross section taken along line II-II of the absorber shown in FIG.
- FIG. 3 is an explanatory view (schematic plan view) for explaining the effect of the absorber shown in FIG. 1.
- FIG. 4 is a perspective view schematically showing a process according to an embodiment of the manufacturing method of the absorbent body of the present invention together with an apparatus.
- FIG. 5 is a conceptual diagram showing how long fibers are cut by an absorbent polymer.
- FIG. 6 (a) to FIG. 6 (e) are schematic plan views showing other embodiments of the absorbent body of the present invention.
- FIG. 7 is a cross-sectional view (corresponding to FIG. 2) showing still another embodiment of the absorbent body of the present invention.
- FIG. 8 is a developed plan view showing a disposable diaper (an embodiment of the absorbent article of the present invention) using still another embodiment of the absorbent body of the present invention.
- FIG. 9 is a schematic cross-sectional view showing a cross section taken along line II of FIG.
- FIG. 10 is a schematic cross-sectional view showing a cross section taken along the line III-III of FIG. 8 in use.
- FIG. 11 is a schematic view showing a cross-sectional structure in the width direction in another embodiment of the absorbent article of the present invention.
- FIG. 12 is a schematic diagram (corresponding to FIG. 11) showing a cross-sectional structure in the width direction in still another embodiment of the absorbent article of the present invention.
- FIG. 13 (a) and FIG. 13 (b) are views showing still another embodiment of the absorbent body of the present invention.
- FIG. 13 (a) is a plan view
- FIG. 13 (b) is a sectional view taken along the line IV-IV in FIG. 13 (a).
- FIG. 14 (a) and FIG. 14 (b) are diagrams showing still another embodiment of the absorbent body of the present invention.
- FIG. 14 (a) is a plan view
- FIG. 14 (b) is a cross-sectional view taken along line V—V in FIG. 14 (a).
- FIG. 15 (a) and FIG. 15 (b) are views showing still another embodiment of the absorbent body of the present invention.
- Fig. 15 (a) is a plan view
- Fig. 15 (b) is a sectional view taken along line VI-VI in Fig. 15 (a).
- FIG. 16 (a) and FIG. 16 (b) are views showing still another embodiment of the absorbent body of the present invention.
- 16 (a) is a plan view
- FIG. 16 (b) is a sectional view taken along the line VII-VII in FIG. 16 (a).
- FIG. 17 (a) to FIG. 17 (c) are views showing still another embodiment of the absorbent body of the present invention
- FIG. 17 (a) is a plan view
- FIG. 17 (b) is FIG. It is the VIII-VIII sectional view taken on the line of (a).
- FIG. 18 (a) and FIG. 18 (b) are diagrams showing a further example of the method for producing an absorbent body of the present invention.
- FIG. 19 is a developed plan view of a pressure roll showing an example of the arrangement of cutting protrusions used in the manufacturing method shown in FIG. 18 (b).
- FIG. 20 is a diagram showing a method for manufacturing an absorbent body according to another embodiment of the present invention.
- FIG. 21 (a) and FIG. 21 (b) are explanatory diagrams of a method for evaluating the shape of a fiber cross section.
- FIG. 22 is a partially cutaway perspective view showing an embodiment of the absorbent body of the present invention (second or third).
- FIG. 23 is a perspective view schematically showing one embodiment of a manufacturing method of an absorbent body of the present invention together with an apparatus.
- FIG. 24 is a perspective view showing another embodiment of the method for producing an absorbent body of the present invention.
- FIG. 25 A diagram showing a formation pattern of the first and second cut portions in the embodiment shown in FIG.
- FIG. 26 is a schematic view showing still another embodiment of the method for producing an absorbent body of the present invention.
- FIG. 27 is an enlarged perspective view showing an example of a pressing roll that can be used in the manufacturing method of FIG.
- FIGS. 28 (a) to 28 (c) are diagrams showing the dispersion pattern of the superabsorbent polymer in Example 11, FIG. 28 (a) is a plan view, and FIG. 28 (b) is an absorber. A cross-sectional view along the longitudinal direction, Fig. 2
- FIGS. 29 (a) to 29 (c) are diagrams showing the dispersion pattern of the superabsorbent polymer in Example 12, FIG. 29 (a) is a plan view, and FIG. 29 (b) is an absorber. A cross-sectional view along the longitudinal direction, Fig. 2
- FIG. 30 is a perspective view, partly broken, showing an embodiment of an absorbent body of the present invention.
- FIG. 31 is a schematic cross-sectional view showing a cross section along line II of the absorber shown in FIG. 30.
- FIG. 32 is an explanatory view (schematic plan view) for explaining the effect of the absorber shown in FIG. 30.
- FIG. 33 is a perspective view schematically showing a process according to an embodiment of the manufacturing method of the absorbent body of the present invention together with an apparatus.
- FIG. 34 (a) to FIG. 34 (e) are schematic plan views showing other embodiments of the absorbent body of the present invention (third invention).
- FIG. 35 (a) is a plan view showing still another embodiment of the absorbent body of the present invention
- FIG. 35 (b) is a sectional view taken along the line bb of FIG. 35 (a). .
- FIG. 36 is a developed plan view showing a disposable diaper (an embodiment of the absorbent article of the present invention) using still another embodiment of the absorbent body of the present invention.
- FIG. 37 is a perspective view showing an embodiment of the absorbent body of the present invention in a partially broken view.
- FIG. 38 is a schematic cross-sectional view showing a cross section along line II-II of the absorber shown in FIG.
- FIG. 39 (a) and FIG. 39 (b) are views showing still another embodiment of the absorbent body of the present invention.
- FIG. 39 (a) is a plan view
- FIG. 39 (b) is a sectional view taken along the line IV-IV in FIG. 39 (a).
- FIG. 40 (a) and FIG. 40 (b) are diagrams showing still another embodiment of the absorbent body of the present invention.
- FIG. 40 (a) is a plan view
- FIG. 40 (b) is a cross-sectional view taken along line V—V in FIG. 40 (a).
- FIG. 41 (a) and FIG. 41 (b) are views showing still another embodiment of the absorbent body of the present invention.
- FIG. 41 (a) is a plan view
- FIG. 41 (b) is a cross-sectional view taken along line VI-VI in FIG. 41 (a).
- FIG. 42 (a) and FIG. 42 (b) are views showing still another embodiment of the absorbent body of the present invention.
- FIG. 42 (a) is a plan view
- FIG. 42 (b) is a cross-sectional view taken along the line VII-VII in FIG. 42 (a).
- FIG. 43 (a) and FIG. 43 (b) are diagrams showing still another embodiment of the absorbent body of the present invention.
- FIG. 43 (a) is a plan view
- FIG. 43 (b) is a cross-sectional view taken along the line VIII-VIII of FIG. 43 (a).
- FIG. 44 (a) is a diagram showing a further example of a method for producing an absorbent body according to the present invention.
- FIG. 44 (b) is a diagram showing a further example of the method for producing an absorbent body of the present invention.
- FIG. 45 is a developed plan view of a pressure roll showing an example of the arrangement of cutting protrusions used in the manufacturing method shown in FIG. 44 (b).
- FIG. 46 is a diagram showing a method for manufacturing an absorbent body according to another embodiment of the present invention.
- FIG. 47 is a cross-sectional view showing still another embodiment of the absorbent body of the present invention.
- FIG. 48 is a cross-sectional view showing still another embodiment of the absorbent body according to the present invention.
- FIG. 49 is a plan view of an absorbent body showing an example of the arrangement of joints.
- FIG. 50 (a) is an electron micrograph showing an example of a massive absorbent polymer.
- the absorbent polymer is obtained by casting an absorbent polymer-containing gel polymerized by an aqueous solution polymerization method into a plate shape and drying it. It was obtained by pulverization later.
- Fig. 50 (b) is an electron micrograph showing another example of a bulky absorbent polymer.
- the absorbent polymer controls the type of surfactant and stirring force by the reverse phase suspension polymerization method. This is the result of agglomeration of irregular shaped particles.
- the absorbent body 10 of the first embodiment has a hydrophilic long fiber web 12 and a massive absorbent polymer 13 (a massive particle) force contained in the web 12. And an wrap sheet 14 covering the absorbent core 11.
- the absorbent body 10 has a rectangular shape in plan view, and in a state where the absorbent body 10 is incorporated in an absorbent article, the longitudinal direction of the absorbent body matches the front-rear direction of the wearer when worn.
- the long fiber web 12 originally has a long fiber strength.
- the long fiber in a part of the web 12 is cut into short fibers. It has become.
- a portion formed by cutting the same long fiber as a portion having a long fiber strength is also a part of the long fiber web.
- the long fiber web 12 including short fibers generated by cutting long fibers is a fiber assembly including long fibers and short fibers that are synthetic or semi-synthetic fibers.
- the absorbent polymer 13 in the absorbent body 10 is unevenly distributed in a part of the absorbent body 10 in the planar direction. Specifically, as shown in FIG. 1 and FIG. 2, a region M (hereinafter also referred to as the center region M) having a predetermined width in the center in the width direction of the absorbent body 10 in the plane direction of the long fiber web 12 is used. It is unevenly distributed in the position.
- the absorbent polymer 13 is distributed substantially uniformly in the portion located in the central region M, while substantially in the portions located in both outer side regions S, S of the central region M. It exists, isn't it.
- the range in which the absorbent polymer 13 is distributed is the long fibers 121 constituting the portions located in the side regions S, S and There are a large number of short fibers 122 formed by cutting the same long fibers.
- the long fibers 121 constituting the portions located in the side regions S and S in the web 12 maintain the form of the long fibers.
- the long fibers 121 located in the side regions S and S are oriented in the longitudinal direction of the web 12.
- the long fiber web 12 preferably includes crimped long fibers as the long fibers.
- the crimp rate (JIS L0208) of the long fiber is preferably 10 to 90%, more preferably 10 to 60%, and still more preferably 10 to 50%.
- the crimp of the long fibers makes the absorbent body 10 flexible and easy to deform as a whole. When incorporated in an absorbent article, the absorbent body 10 can be fitted to the wearer or deformed into a concave shape to prevent it. It is possible to improve the deformability to a concave shape when improving leakage.
- the long fiber web 12 preferably includes crimped short fibers as short fibers 122 (hereinafter, also referred to as short fibers derived from long fibers) generated by cutting the long fibers. It is preferable that the crimped short fiber has a crimp rate comparable to that of the above-described crimped long fiber. When the short fibers are crimped, the absorbent polymer is more stably held in the web, and the absorbent polymer is prevented from moving in the web or dropping of the web force.
- the crimp of the long fiber and the short fiber may be two-dimensional or three-dimensional!
- the crimp rate of long fibers is defined as the percentage of the difference between the length A when the long fibers are stretched and the length B of the original long fibers with respect to the length A when stretched. It is calculated from the formula of
- Crimp rate ((A—B) ZA) X 100 (%)
- the length of the original long fiber means a length in which the long fiber is in a natural state and both ends of the long fiber are connected by a straight line.
- the natural state refers to a state in which one end of a long fiber is fixed to a horizontal plate and hung downward by its own weight.
- the length when the long fiber is stretched is the length at the minimum load when the long fiber is stretched until there is no crimp.
- the crimp rate of the long fibers is as described above, and the number of crimps is preferably 2 to 25, particularly 4 to 20, especially 10 to 20 per lcm.
- the crimp rate of the short fiber is measured in the same manner. However, the crimp rate is measured on fibers with a length of 10 mm or more.
- Hydrophilic long fibers are inherently hydrophilic fibers and are not inherently hydrophilic, but are subjected to a hydrophilization treatment. Thus, both of the fibers imparted with hydrophilicity are included.
- acetate cellulose triacetate and z or cellulose diacetate are preferably used.
- Nylon, acrylic fiber, or the like can also be used as the long fibers constituting the web (similar to the short fibers derived from long fibers).
- Hydrophilic long fibers (similar to short fibers derived from long fibers) have a moisture content of less than 10%, particularly 1 to 8%, from the viewpoint of ensuring liquid permeability, that is, by absorbing water. However, since it is not plasticized, it does not soften, or the fibers do not swell, and therefore clogging does not occur. In addition, fibers with high moisture content absorb moisture, or the fibers themselves have strong hydrophilic properties, so that they are particularly absorbent articles by hydrogen bonding between fibers or between different parts of the same fiber.
- the product When the product is compressed to control its thickness in the manufacturing process of the product, or when the absorbent article is placed in a compressed state for a long time in a pack or the like, the product becomes hard and the wearing feeling is reduced or rubbed. There is a possibility of causing physical troubles.
- the moisture content is measured by the method described in paragraph [0025] of Patent Document 2.
- the long fiber means a fiber having a fiber length of preferably 70 mm or more, more preferably 80 mm or more, and even more preferably 100 mm or more when the fiber length is measured by the average fiber length measurement method (Method C) of JIS L1015. I mean. However, when the total length L of the web to be measured (see Fig. 1) is less than 100 mm, preferably 50% or more, more preferably 70% or more, more preferably 80% or more of the fibers in the web.
- the fiber of the web is assumed to be a long fiber when it extends over the entire length of the web.
- the long fiber used in the present invention is generally called a continuous filament. A bundle of continuous filaments is generally called a tow. Therefore, the long fiber in the present invention is a concept including a continuous filament.
- the short fiber is a fiber measured by the same measurement method as that for the long fiber.
- the absorbent body of the present invention is close to a very short fiber (less than 5 mm in length) or powder that seems to be difficult to measure by the measurement method of JIS L1015 or may contain a large error! , Things may be included.
- the long fibers in the present invention are obtained by compressing and compressing a part of the long fiber web in the presence of massive particles (such as massive absorbent polymer) during the production of the absorbent.
- the fiber strength is preferably 3 gZd or less, and is preferably 0.5 to 2.5 gZd.
- the fiber strength is measured as follows.
- JIS L1015 chemical fiber staple test method The test was performed in accordance with the tensile strength section. That is, one fiber was attached to a copy sheet so that the length (space distance) of the unfixed portion of the fiber was 20 mm (10 mm when the fiber was short). Specifically, each end of the fiber is attached to an 18 mm wide adhesive tape (Nichiban Co., Ltd.'s scotch tape (Products) so that the distance between the adhesive tapes is 20 mm (or 10 mm for short fibers). Name)] was fixed to the copy paper.
- This sample was attached to a chuck of a tensile tester, the paper was cut in the vicinity of the upper and lower affixing tape portions, and subjected to a tensile test.
- the apparatus used was an ORIENTEC RTC-1150A type Tensilon tensile tester.
- the measurement range was switched appropriately using a full scale 5 kg load cell.
- the pulling speed was 300mmZmin. Measurement was performed at 10 points, and the average value was taken as the measured value. Measurements were added, except for measurements that were 20% or more above the average value.
- the fineness of the long fibers is preferably 1.0 to 10 dtex, and particularly preferably 1.5 to 8 dtex.
- the fiber strength is preferably 3 gZd or less, and is preferably 0.5 to 2.5 gZd.
- Short fibers obtained by cutting long fibers with massive particles usually have a different cross-sectional shape at the end of the fiber and a cross-sectional shape at the center of the fiber. Whether or not the cross-sectional shape at the end and the cross-sectional shape at the center of the fiber are different can be determined as follows.
- the cross-sectional shape of the fiber end portion and the fiber center portion is observed using an electron microscope.
- the cross-sectional shape of the fiber end is observed from the cross-sectional direction in the fiber long axis direction by attaching the fiber vertically to the sample stage.
- the cross-sectional shape shall be the contour within the depth of focus of the electron microscope, and is not a projection of the end cross-section. Then, the cross-sectional shape of either one of both end portions is the cross-sectional shape of the end of the fiber.
- the center of the fiber the center of the apparent length of the fiber is cut with a force razor so as not to cause tailing of the fat, and observed in the same manner.
- the apparent length of the fiber is the distance between the ends when the ends are fixed on a cardboard or the like with a minimum load so that the fibers do not stretch.
- the image of the end cross section and the image of the fiber center cross section are compared, and when both the shapes are approximately the same and the area is also approximately the same, In other cases, it is determined that “the cross-sectional shape at the end of the fiber and the cross-sectional shape at the center of the fiber are not the same”.
- the cross-sectional areas are substantially the same, as shown in Fig. 21 (a), when the image of the end cross-section and the image of the cross-section at the center of the fiber are superimposed, This is the case where the total area S1 of the part a where the two do not overlap is 30% or less of the area S2 of the part b where the two images overlap [(S1ZS2) is 0.3 or less].
- Fig. 21 (a) shows a case where the end cross section and the fiber center cross section have the shape "substantially the same” and the cross-sectional area is also “substantially the same”.
- the cross-sectional area does not correspond to “substantially the same” and the cross-sectional area does not correspond to “substantially the same”.
- the short fibers derived from the long fibers are used for the individual short fibers from the viewpoint of obtaining good spot absorbability. It is preferable that the positions of both ends (cut ends) in the longitudinal direction are randomly positioned in the longitudinal direction of the absorbent body.
- the lump shape is an irregular and square shape, or an irregular shape having a plurality of irregularities on the surface irregularly.
- Fig. 50 (a) is an electron micrograph showing an example of an absorbent polymer having an irregular shape and an angular shape
- Fig. 50 (b) is irregular and has a plurality of irregularities on the surface
- 2 is an electron micrograph showing an example of a shaped absorbent polymer.
- Massive absorbent polymer refers to a water-absorbing polymer-polymerized absorbent polymer-containing gel that is cast into a plate and pulverized after drying, or the type of surfactant and stirring force are controlled by reverse-phase suspension polymerization. As a result, the irregular shaped particles are aggregated.
- non-absorptive absorbent polymers include spherical ones, a plurality of spherical aggregates, fibrous ones, and scale-like ones. Power of the density of the absorbent polymer bulk is 0. 5 ⁇ 0. 8gZcm 3 is preferable instrument 0. 55-0. More preferably 7 g / cm 3.
- the average particle diameter of the massive absorption '14 positive mer is preferably 150 to 600 m, particularly 200 to 500 m.
- the material of the absorbent polymer various known polymer materials conventionally used for absorbent bodies such as disposable diapers and sanitary napkins can be used.
- poly (sodium phthalate) (vinyl alcohol acrylate) ) Copolymer cross-linked sodium polyacrylate, (starch-acrylic acid) graft polymer, (isobutylene maleic anhydride) copolymer and saponified product thereof, potassium polyacrylate, cesium polyacrylate, etc. It is done.
- the absorbent polymer is preferably one that has the ability to absorb and retain water or saline more than 20 times its own weight.
- the massive particles in addition to the massive absorbent polymer, for example, organic powders such as cellulose powder, activated carbon, silica, and various clay minerals such as alumina (zeolite, sepiolite, bentonite, strong crankinite, etc.), inorganic and inorganic particles (extinguishing) Odorants and antibacterial agents can be used. These Can be used singly or in combination of two or more.
- organic powders such as cellulose powder, activated carbon, silica, and various clay minerals such as alumina (zeolite, sepiolite, bentonite, strong crankinite, etc.), inorganic and inorganic particles (extinguishing) Odorants and antibacterial agents can be used. These Can be used singly or in combination of two or more.
- the inorganic particles those partially substituted with metal sites can be used. These may be used as aggregates, or may be used in combination with another carrier. Two or more of these massive particles can be used in combination.
- the average particle diameter of porous particles such as activated carbon and silica gel is preferably 20 to 300 m, particularly 50 to 150 ⁇ m.
- the average diameter of the aggregate or the complex with the carrier is preferably 150 to 600 / ⁇ ⁇ , particularly 200 to 500 m.
- the function of these components is to suppress the smell of excreta absorbed by the absorber and the smell derived from the material.
- a block polymer and a non-block polymer can be used in combination.
- a block polymer and a non-block polymer can be used in combination.
- Non-bulk polymers include a method of spray-drying with a mixture of a monomer, a polymerization initiator, a crosslinking agent, etc., and a method of adjusting the type of solvent or surfactant by reverse phase suspension polymerization (generally, By reducing the difference in sp value between the polymer and the solvent, it is possible to obtain a spherical polymer free from surface irregularities).
- the absorbent polymer of the present invention compresses the absorbent polymer with a roll or the like and cuts a part of the long fiber, a part of the absorbent polymer may be crushed and the particle size may be reduced. including .
- Absorbent polymers with a small particle size are more likely to be packed more closely than absorbent polymers with a large particle size! /, So there is a possibility of causing gel blocking and a decrease in liquid uptake rate into the absorber.
- an absorbent polymer subjected to surface cross-linking is used, the weakly cross-linked portion is exposed by pulverization, and similarly there is a risk of gel blocking. Gel blocking leads to liquid residue on the surface and liquid return.
- the absorbent body of the present invention can contain various buffering agents so that a buffer system is established when excrement is absorbed by the absorbent body. That is, various organic and inorganic buffering agents, that is, acetic acid, phosphoric acid, succinic acid, succinic acid, adipic acid, malic acid, lactic acid or salts thereof can be used alone or in combination, or various amino acids can be used. .
- various organic and inorganic buffering agents have the effect of neutralizing excrement, for example, ammonia generated by the decomposition of urine, and keeping the diaper neutral to weakly acidic. Even if the excrement returns to the skin, the effect on the skin can be reduced.
- various organic and inorganic buffering agents have a function of neutralizing alkalis such as ammonia.
- hydrophilic fine powders or short fibers are allowed to coexist in the web for the purpose of enhancing the spot absorbency, which is the effect of the present invention, and for the purpose of improving the liquid retention and absorption rate and improving the dryness.
- Hydrophilic fine powders or short fibers include fibrillated or fibrillated cellulose powder, carboxymethyl cellulose and its metal salt, carboxyethyl cellulose and its metal salt, hydroxyethyl cellulose and its Examples include short fibers such as derivatives, silk powder, nylon powder, rayon, cotton, and wool. Among these, it is preferable to use cellulose powder because the above effect can be improved to the maximum.
- the hydrophilic fine powder or short fiber may be sprayed on the web before spraying the absorbent polymer, or may be mixed with the absorbent polymer and sprayed on the web at the same time.
- the fiber length of the cut short fibers of the present invention is shortened, the web shape retention is improved, the web compression recovery is improved, and the web is less likely to be twisted. Further, it is preferable to join the long fibers constituting the web for the purpose of improving the web transportability.
- a water-soluble adhesive such as polyvinyl acetate or atelier emulsion can be used.
- the long fiber is made of acetate
- an agent capable of dissolving and plasticizing acetate such as triacetin
- triacetin is sprayed on the web after spraying the absorbent polymer to dissolve and plasticize the acetate, and the long fiber You can join them together.
- Another method for joining long fibers includes a method in which a synthetic pulp of thermoplastic resin is dispersed in a web and then heated to melt the synthetic pulp. Synthetic pulp can be spread on the web simultaneously with or before the absorbent polymer. When spraying, it is preferable to suck from the surface of the web opposite to the spray surface so that the synthetic norp and the absorbent polymer are fully distributed in the web. Long fibers heat In the case of a plastic resin, it is preferable to use a synthetic pulp made of a thermoplastic resin having a lower melting point than that of the thermoplastic resin.
- the top of the web and Z or below or in addition to or instead of this, One or more sheet materials such as non-woven paper are laminated or covered on the side, and the web and the sheet material are joined by an adhesive applied to the sheet, or heat-sealed.
- a method is mentioned. According to this method, a sheet-like absorbent body in which a web is sandwiched and fixed between a pair of sheet materials can be obtained.
- Such a sheet-like absorbent body has high rigidity due to the bonding with the sheet material and the rigidity of the sheet material itself, thereby improving the handling property, and can be easily transported by itself. it can.
- this sheet-like absorbent body can be easily cut or cut into a desired shape, an absorbent body corresponding to the shape of the absorbent article can be easily produced.
- an adhesive is applied so as not to impair the water permeability, softness, and air permeability of the web.
- the fiber can be joined at many joining points without impairing the properties of the web.
- UFD fiber trademark
- a hydrophilic adhesive or a hydrophobic adhesive can be used with no particular limitation on the type of adhesive.
- Particularly preferred are hydrophilic adhesives. Examples of the hydrophilic adhesive include cycloflex (registered trademark of National 'Starch and Chemical Co., Delaware, USA) which is a hydrophilic hot melt pressure-sensitive adhesive.
- the adhesion between the sheet material and the web is mainly the force by which the surfaces adhere to each other.
- the adhering agent is included in the web, and includes bonding the fibers inside the web in the thickness direction.
- the sheet material on the web and Z or below is also advantageous from the standpoint of enhancing the absorbent performance of the absorbent body.
- various fiber sheets and fiber webs as the sheet material. Examples thereof include air-through nonwoven fabric, airlaid nonwoven fabric, dry pulp nonwoven fabric, paper containing crosslinked norp and crosslinked pulp, and composites thereof. These sheet materials may be used singly or may be used by superposing a plurality of sheets.
- the fibers that make up these sheet materials should have a fiber diameter of 1.7 to 12 dtex, especially 2.2 to 7.8 dtex, especially 3.3 to 5.6 dte X.
- the soot amount is preferably 15 to 200 g / m 2 , more preferably 20 to 150 g / m 2 , and particularly preferably 25 to 120 gZm 2 .
- the basis weight is 15 ⁇ : LOOgZm 2 , especially 20-80gZm 2 , especially It is preferable to be 25 to 50 g / m 2 .
- the absorber On the other hand, if you want to improve the cushioning properties of the absorber, if you want to make the absorber less likely to squeeze, if you want to give the absorber a compression recovery property, or if you want to suppress the transpiration of water vapor from the absorber, increase the amount.
- the central region M where the short fibers are generated is positioned at the portion P facing the wearer's liquid excretion portion.
- the fluid excreted from the fluid excretion part urine, menstrual blood, etc.
- the absorbent body 10 is smoothly absorbed from a narrow area of the body 10. Then, the liquid absorbed in the absorbent body 10 is absorbed by the absorbent polymer 13 unevenly distributed at the site, and is stably held in the absorbent body 10.
- the liquid diffuses to the side regions S and S.
- the long fibers exist in each of the side regions S and S while maintaining their form, and they are oriented in the longitudinal direction of the absorber, the liquid reaching the side regions s and S is absorbed. It diffuses well in the longitudinal direction of the body 10 (front and rear direction of the wearer), and diffusion in the direction across the side regions S and S is suppressed. As a result, leakage of liquid from both side edges of the absorber 10 is effectively prevented, and a wide range of the absorber is effectively utilized.
- the absorbent polymer 13 and the short fibers 12 2 derived from long fibers in the absorbent body 10 of the present embodiment are both present in the central region M of the absorbent body 10, and the absorbent polymer (particles) 1
- the range in which 3 is distributed and the range in which short fibers 122 are produced are the same.
- the width of the range in which the short fibers 13 are generated in the width direction of the absorbent body 10 is the width (side region) that is substantially free of short fibers that are preferably 20-95%, especially 50-85% of the total width W of the absorbent body 10 (see Fig. 1). It is preferable that W2 (see Fig. 1) is 5 to 80%, particularly 15 to 50% of the total width W of the absorber 10.
- a water-permeable sheet material such as a pulp sheet such as tissue paper or a water-permeable nonwoven fabric is preferably used.
- the absorbent polymer 13 and the short fiber 122 are substantially included, and the portion W2 is covered with the wrap sheet and may not be included.
- the absorbent polymer used in the embodiment of the present invention has a water absorption of 30 gZg or more, particularly 30 to 50 gZg, by the centrifugal dehydration method.
- the point power for preventing the gel feeling after liquid absorption from being lowered is preferable.
- the absorption amount of the absorbent polymer by centrifugal dehydration is measured as follows. In other words, the absorbent polymer lg was swollen with 150 ml of physiological saline for 30 minutes, then placed in a 250 mesh nylon mesh bag, dehydrated with a centrifuge at 143G (800 rpm) for 10 minutes, and the whole after dehydration. Measure the weight. Next, the water absorption (gZg) by centrifugal dehydration is calculated according to the following formula.
- the absorbent polymer can Due to the occurrence of gel blocking and due to the fact that the liquid passage time measured in 1) is 20 seconds or less, especially 2 to 15 seconds, especially 4 to 10 seconds. It is preferable to prevent the deterioration of the absorption performance, and to prevent the leakage due to the drainage of the liquid caused by the inadequate absorption.
- the measurement of the liquid transit time is as follows. That is
- the absorbent polymer it is more preferable to use an absorbent polymer having high liquid permeability under load.
- the absorbent polymer preferably has a flow rate value of 30 to 300 mlZmin, more preferably 32 to 200 mlZmin, and even more preferably 35 to: LOOmlZmin. is there.
- the liquid flow rate is less than 30 mlZmin, the absorbent polymers saturated and swollen by the liquid absorption adhere to each other under load and prevent the passage of the liquid, which easily causes gel blocking.
- the larger the value of the liquid flow rate the better from the viewpoint of preventing the occurrence of gel blocking.
- the liquid flow rate is as high as OmlZmin, the occurrence of gel blocking is almost certainly prevented.
- the liquid flow rate exceeds 300mlZmin, the fluidity of the liquid in the absorber is too high, especially when many excretions are excreted at once, or in older infants or adults.
- the excretion rate is fast, the liquid may be sufficiently fixed and the fluid may leak when the absorber is made thinner.
- increasing the flow rate increases the degree of cross-linking of the absorbent polymer, lowers the absorption capacity per unit weight of the absorbent polymer, and requires a large amount of absorbent polymer to be used. Nah ...
- Filtration cylindrical tube equipped with a metal net (mesh size 150 m) and a narrow tube (inner diameter 4 mm, length 8 cm) with a wire mesh (opening 2 mm) at the lower end of a vertically standing cylinder (inner diameter 25.4 mm) Prepare. With the cock closed, adjust the particle size to 850 to 150; ⁇ ⁇ in the cylindrical tube. Add 0.32 g of the measured sample. Next, 50 ml of 0.9% by weight physiological saline is poured into the cylindrical tube.
- the absorbent polymer that can be used in the preferred embodiment of the present invention, those that satisfy the above-mentioned characteristics are preferred. Specific examples include sodium polyacrylate and (vinyl alcohol acrylate). ) Copolymer, cross-linked poly (sodium acrylate), (starch-acrylic acid) graft polymer, (isobutylene maleic anhydride) copolymer and saponified product thereof, potassium polyacrylate, cesium polyacrylate, etc. . In order to satisfy the above characteristics, for example, a crosslink density gradient should be provided on the surface of the absorbent polymer particles. Alternatively, the absorbent polymer particles may be non-spherical amorphous particles. Specifically, the method described in JP-A-7-184956, column 7, line 28 to column 9, line 6 can be used.
- the absorbent body of the present invention having a long fiber web has a sparse structure with large gaps between fibers compared to a conventional absorbent body mainly composed of flap pulp. It also has good liquid permeability. Therefore, when the absorption rate of the absorbent polymer is low, the liquid may pass through the absorber before being absorbed by the absorbent polymer, and may not be sufficiently absorbed by the absorber. From this viewpoint, it is preferable that the absorbent polymer contained in the web has a sufficiently high absorption rate. As a result, the liquid can be reliably held in the absorber.
- the absorption rate of an absorbent polymer is generally expressed in the art by the measured value of the DW method. The absorption rate by the DW method (mlZO.
- 3g-3 Osec is measured using an apparatus (Demand Wett ability Tester) generally known as an apparatus for performing the DW method.
- the surface of the physiological saline is set to an equal water level.
- the amount of water absorption at the time when the absorbent polymer is sprayed is taken as 0, and the amount of water absorption after 30 seconds (this amount of absorption is measured on the burette scale indicating the amount of physiological saline) is measured.
- the value of absorption obtained is taken as the water absorption rate.
- the absorption rate can be designed by the shape, particle size, bulk density, degree of crosslinking, etc. of the absorbent polymer.
- the absorption rate measured according to the DW method is 2 to: LOmlZO. 3g-30sec,
- an absorptive polymer of 4 to 8 mlZ0.3g '30 sec is preferably used.
- the absorption polymer having such an absorption rate has been avoided in the conventional absorber mainly composed of fluff norp because it causes gel blocking and thus liquid leakage. is there.
- the web has a sparse structure! /, Resulting in high uptake of liquid into the web and high passage speed of the taken up liquid. Even if an absorptive polymer having an absorption rate is used, gel blocking is difficult to occur. Conversely, liquid leakage is effectively prevented.
- an absorbent polymer having a short liquid passage time or an absorbent polymer having a high absorption speed may be used alone! However, the liquid passage time and the absorption speed are within the above desired range.
- Another absorbent polymer may be mixed or coexisted.
- the absorbent polymer S1 having a relatively short liquid passage time and the absorbent polymer S2 having a relatively long liquid passage time may be mixed and used. In this case, when the absorbent polymer S1 and the absorbent polymer S2 are compared, the absorbent polymer S2 has higher absorption capacity and absorption rate, but is less resistant to gel blocking.
- the absorbent polymer S1 and the absorbent polymer S2 coexist, the absorbent polymer S1, which is hard (that is, hard to gel block), enters between the absorbent polymer S2 with high absorption performance, making the absorber more efficient Can be used.
- an absorbent polymer S3 having a relatively high absorption rate and an absorbent polymer S4 having a relatively low absorption rate coexist.
- the absorbent polymer S3 is arranged on the back sheet side and the absorbent polymer S4 is arranged on the top sheet side, so that the absorption rate of the liquid in the absorber is further increased and the liquid fixing ability is also increased.
- the same effect can be obtained by arranging the absorbent polymer S1 having a short liquid passage time on the top sheet side and the absorbent polymer S3 having a high absorption rate on the back sheet side.
- the amount of liquid return is further reduced even though the absorbent body of the present invention is thin and soft.
- the amount of liquid return is preferably lg or less, more preferably 0.5 g or less, and even more preferably 0.25 g or less.
- the method for measuring the amount of liquid return is as follows. In the case of infant paper diapers (size M), 160 g of colored physiological saline is injected into the center in the width direction at a position 150 mm from the edge of the diaper of the diaper using a funnel. Red No. 1 is used for coloring, and the amount of pigment added is 50 ppm (0.5 g for 10 liters of physiological saline).
- Advantech filter paper No. 4A Ten minutes after the completion of the injection, 10 sheets of Advantech filter paper No. 4A are placed on the diaper. Apply pressure of 3. 43kPa from the top of the filter paper for 2 minutes to allow the filter paper to absorb the physiological saline. Measure the weight of the filter paper and use the increase in weight as the liquid return amount. Perform three measurements. If the size of the diaper is different, change the injection volume of physiological saline and the pressure condition of the filter paper as follows. In the case of baby diapers, pressurize the filter paper at 3. 43 kPa, and change the amount of saline injected according to the size of the diaper (new baby, S size is 120 g, other sizes are 160 g).
- the pressure on the filter paper is standardized at 5.15 kPa.
- the solution to be injected should be 10 g of horse blood instead of saline.
- the absorbent body manufacturing apparatus shown in FIG. 4 uses a fiber opening mechanism 2 and a fiber opening mechanism 2 to obtain a long fiber web 12 by opening and opening the tow 12a having a long fiber force in the longitudinal direction while continuously conveying the tow 12a.
- Tension relief mechanism 3 that transports the opened web 12 to a supply position of polymer 13 in a tension-relieved state 3.
- Lap sheet supply mechanism 4 that supplies wrap sheet 14 to one side of long fiber web 12 4.
- Wrap Absorbent polymer supply mechanism 6 for supplying the absorbent polymer 13 to the web 12 on the sheet 14 from the side opposite to the wrap sheet 14 side, and portions 14a of the wrap sheet 14 extending from both side edges of the web 12 , 14a is folded back, and the web 12 is covered with the wrap sheet 14.
- a long fiber cutting mechanism 8 for cutting the long fibers in a part of the web 12 by compressing the 12 with the wrap sheet in the thickness direction is provided.
- the opening mechanism 2 is configured to continuously pull out the band-like tow 12a from the folded and compressed original fabric, and sequentially open the tow 12a during the conveyance.
- the opening mechanism 2 includes opening machines (banding jets) 21 to 23.
- a guide 24 is provided between the spreaders 21 and 22 for lowering the tow 11 after being sent upward, and between the spreaders 22 and 23, a pretensioning roll 25 and a bloomer roll are provided.
- the spreaders 21 to 23 are devices that widen the width of the tow being conveyed by blowing air.
- the pretensioning roll 25 includes a pair of rolls 250 and 251 that roll up the tow 12a opened by the spreader 21 and feed it at a predetermined speed.
- the bloomer roll 26 includes a metal groove roll 260 having a large number of grooves and ridges extending in the circumferential direction, and an anvil roll 261 having a peripheral surface formed of rubber. A difference in speed is provided between the groove portion 260 and the protruding portion of the groove roll 260 presses and applies tension to the groove portion of the groove roll 260. Open 12a.
- the tension relaxation mechanism 3 includes a feed roll 31 and a vacuum conveyor 32 that are arranged downstream of the spreader 23.
- the feed roll 31 includes a pair of rolls 310 and 311 that are rotationally driven at a peripheral speed lower than the peripheral speed V2 of the bloomer roll 26.
- Feed roll 31 is a state in which a long fiber web 12 obtained by opening the tow 12a by the opening mechanism 2 is stretched between the pretensioning roll 25 and the bloomer roll 26 to increase the tension. It is supplied on the lap sheet 14 supplied on the vacuum conveyor 32 in a state where the tension is relaxed rather than the tow or web.
- the vacuum conveyor 32 includes a breathable endless belt 320 driven by a feed speed V4 slower than the feed speed V3 of the feed roll 31 (the peripheral speed of the pair of rolls 310 and 311), and a vacuum box 321. ing.
- the web 12 supplied onto the lap sheet 14 on the vacuum conveyor 32 is further conveyed by the endless belt 320 while being in a state of relaxed tension, and is conveyed to a polymer supply position.
- the wrap sheet supply mechanism 4 supplies the wrap sheet 14 to one side of the long fiber web 12. To do.
- the wrap sheet supply mechanism 4 is powered by the unwinding means of the wrap sheet 14 and a guide roll (not shown) that guides the unwrapped wrap sheet 14 to the vacuum conveyor 32. And a drive device (not shown) for driving the roll 41.
- the absorbent polymer supply mechanism 6 sprays the absorbent polymer 13 from a polymer supply port arranged on the upper surface side (the surface side opposite to the wrap sheet 14 side) of the long fiber web 12.
- a vacuum box 321 is located on the opposite side of the polymer supply port across the endless belt 320, and the absorbent polymer can be sprayed under the state of being sucked from the back side of the web 12 by the vacuum box 321. it can.
- the width of the polymer supply port in the direction perpendicular to the conveyance direction (longitudinal direction) of the web 12 is narrower than the width of the web, and the polymer 13 is dispersed only in a predetermined width region in the center of the web 12 in the width direction. It is made like that.
- the folding mechanism 7 includes folding guides 71 on both sides in the flow direction.
- the wrap sheet 14 is pulled by a pair of rolls 80 and 81 constituting the long fiber cutting mechanism 8 and is continuously conveyed, while the wrap sheet 14 extends outward from both side edges of the web 12. Minutes 14a and 14a are each folded back by the guide 71 to the upper surface side of the web 12. By this folding, the upper surface side of the web 12 is also covered with the wrap sheet 14, and as a result, the upper and lower surfaces of the web 12 are covered with the wrap sheet 14.
- the long fiber cutting mechanism 8 is a composite comprising a long fiber web 12 coated on both sides with a wrap sheet (hereinafter referred to as a long fiber web 12 on which a polymer is dispersed and a wrap sheet 14 covering the web).
- a pair of rolls 80 and 81 that compress and compress in the thickness direction across the absorbent continuum 100 are also provided.
- One roll 80 has an outer peripheral surface 80S of a portion located on both sides of the central region in the axial length direction because the outer peripheral surface 80M of a predetermined width portion in the center in the axial length direction is an elastic material force such as rubber and silicon. Is made of hard material (inelastic material) such as metal such as steel. The width of the outer peripheral surface 80M made of an elastic material in the roll 80 in the direction perpendicular to the web 12 is substantially the same as the width in the same direction of the polymer supply port.
- An absorbent continuous body cutting mechanism 5 is provided downstream of the long fiber cutting mechanism 8.
- the continuous body cutting mechanism 5 includes a cutter roll 51 having a cutting blade 51a extending in the axial direction, An absorbent roll 52, and cut the absorbent body 100 into individual absorbent body lengths to be incorporated into the absorbent article.
- the band-like tow 12a is continuously drawn from the raw fabric by the fiber opening mechanism 2, and the fiber opening machines 21 to The compressed tow 12a is widened and the tow 12a is stretched by stretching the tow 12a due to the circumferential speed difference between the pretensioning roll 25 and the bloomer roll 26. obtain.
- the obtained web 12 is supplied via a feed roll 31 onto a lap sheet 14 supplied onto a vacuum conveyor 32.
- the absorbent polymer 13 is sprayed on the web 12 by the absorbent polymer supply mechanism 6.
- the absorbent polymer 13 is dispersed only in a region having a predetermined width in the center in the width direction of the web 12. Further, the absorbent polymer 13 is continuously sprayed in the longitudinal direction of the web 12. The amount of the absorbent polymer 13 sprayed is more preferably equal to or more than the basis weight of the web 12 from the viewpoint of cutting the long fibers satisfactorily when cutting the long fibers described later. Is 2 times or more, more preferably 3 times or more. For example, if the basis weight of the web 12 was 30GZm 2, application rate of the absorbent polymer 13,. 30 to 400 g / m 2, particularly preferably the force be 60 ⁇ 300g / m 2 ⁇ .
- the web 12 obtained by opening the tow 12a is laminated on the lap sheet 14 in a state where the web 12 is contracted from the maximum stretched state when the tow 12a is opened.
- the circumferential speed V2 of the bloomer roll 26 is made faster than the circumferential speed VI of the pretensioning roll 25 to open the tow 12a, while the circumferential speed V2 of the bloomer roll 26 is By reducing the conveyance speed V4 of the wrap sheet 14 (same as the conveyance speed of the endless belt 320 of the vacuum conveyor 32), the tension of the web 12 on the vacuum conveyor 32 is relaxed to develop crimpability.
- the preferable crimp rate of the above-mentioned long fibers and short fibers can be efficiently expressed.
- the maximum stretched state when opening the tow 12a is between the pretensioning roll 25 and the bloomer roll 26. This is an extended state.
- a wrap sheet 14 having a width sufficient to cover both the upper and lower surfaces of the web 12 is used as the wrap sheet 14.
- the wrap sheet 14 has portions 14 a and 14 a extending from both side edges of the web 12.
- the upper surface side is also covered with a wrap sheet.
- various materials conventionally used when enveloping the absorbent core can be used without particular limitation.
- the absorbent continuous body 100 is subjected to pressure compression by the long fiber cutting mechanism 8 described above and the cutting of long fibers thereby.
- This pressure compression and the cutting of the long fibers by this process are carried out by passing the absorbent continuous body 100 through a pair of rolls 80, 81 and covering the entire area or a part of the web 12 where the absorbent polymer 13 is dispersed. Pressing in the thickness direction is performed.
- the long fiber is cut in a range in which the absorbent polymer 13 is dispersed, and between the outer peripheral surface 80M made of an elastic material of one roll 80 and the outer peripheral surface made of a hard material of the other roll 81. Occurs in the sandwiched and pressurized area.
- the long fibers are cut by the long fibers 121 being pressed against the massive absorbent polymer 13 and the continuous absorbent body in which the long fibers in a part of the web 12 are cut.
- the body 100 is cut into a desired size according to the type, size, and the like of the absorbent article into which the body 100 is cut by the absorbent continuous body cutting mechanism 5 to obtain the absorbent body 10.
- the absorber 10 having the above-described form can be efficiently and continuously produced in this manner.
- Examples of the absorbent article into which the absorbent body according to the present invention is incorporated include disposable diapers, sanitary napkins, panty liners (orimono sheets), incontinence pads, and the like.
- the absorbent article generally includes a liquid-permeable top sheet, a liquid-impermeable or water-repellent back sheet, and an absorbent body interposed between these two sheets.
- the method for manufacturing the absorbent body 10 of the present embodiment a desired part can be obtained by appropriately adjusting the range in which the massive absorbent polymer is dispersed and the range in which the long fibers are cut by pressure compression.
- An absorber having a region excellent in spot absorptivity can be efficiently manufactured.
- the force of cutting the long fibers with a compression roll is sprayed on the pre-cut fibers. The same effect can be obtained even when combined.
- the fiber cutting method can be a known method such as a method of cutting a plurality of rolls engraved with many slits, a method using a cutter blade, or using a water flow or laser. . Since the long fibers are crimped, even if some of the fibers are cut, the fibers are entangled with each other and can be carried on a conveyor or the like.
- Fig. 6 (a) to Fig. 6 (e) are diagrams schematically showing an absorbent body according to another embodiment of the present invention.
- the area with the diagonal line of the downward slanting line is the area where the RA force-absorbing polymer is sprayed (the same as the area where the absorbent polymer is distributed)
- the region RB indicated by the dotted diagonal line is the range in which the web 12 is pressed and compressed to produce short fibers derived from long fibers.
- the absorbent shown in Fig. 6 (a) includes a range RB where short fibers are generated in a range RA where the absorbent polymer is distributed. Specifically, in either the longitudinal direction or the width direction of the absorbent body, short fibers are generated and the range RB is narrower than the range RA in which the absorbent polymer is distributed.
- the absorbent body shown in FIG. 6 (a) is the above-described roll manufacturing method in the absorbent body manufacturing method described above, in the circumferential direction of the outer peripheral surface, a cut portion made of an elastic material and a hard material such as a metal (non-elastic material). ) And the non-cut portions are formed alternately, and the width of the cut portion in the direction perpendicular to the web 12 is smaller than the width in the same direction of the polymer supply port.
- the long fiber at the portion compressed and compressed between the cut portion of the roll 80, which is an elastic material, and the outer peripheral surface of the roll 81, which is a hard material force, is cut.
- a concave portion can be formed between the cutting portions, and the concave portion can be used as a V or non-cutting portion without cutting the long fiber.
- the absorber shown in Fig. 6 (b) also includes the range RB in which short fibers are generated in the range RA in which the absorbent polymer is distributed. Specifically, in the width direction of the absorbent body, the range in which short fibers are generated than the range RA in which the absorbent polymer is distributed. In the longitudinal direction of the absorbent body in which the width of RB is narrow, the absorbency The range where polymer is distributed RA and short fibers are generated, the range where RB The length is the same.
- the absorbent body shown in FIG. 6 (b) has the width force in the direction perpendicular to the web 12 of the outer peripheral surface 80M that also has elastic material force as the roll 80 in the above-described manufacturing method of the absorbent body. It can manufacture by using a roll narrower than the width
- the absorbent body shown in FIG. 6 (c) is formed by intermittently spraying the absorbent polymer, and as the roll 80, a cut portion made of an elastic material in the circumferential direction of the outer peripheral surface.
- non-cutting portions made of a hard material (non-elastic material) or non-cutting portions that are concave portions are alternately formed, and the width in the direction perpendicular to the web 12 of the cut portion is the same direction of the polymer supply port. It can be manufactured by using the same roll as the width.
- Each absorber shown in Fig. 6 (d) and Fig. 6 (e) has a narrower range RB in which short fibers are produced than the range RA in which the absorbent polymer is distributed.
- the absorbent body shown in FIG. 6 (d) has an absorbent polymer dispersed on the entire surface of the web, and the roll 80 has a cut portion made of an elastic material in the circumferential direction of the outer peripheral surface.
- Non-cut portions made of hard material (non-elastic material) or non-cut portions which are concave portions are alternately formed, and the width of the cut portion in the direction perpendicular to the web 12 is the same direction of the polymer supply port.
- the absorbent body shown in FIG. 6 (e) is the above-described manufacturing method of the absorbent body, in which the absorbent polymer is spread over the entire surface of the web, and the roll 80 is cut in the circumferential direction of the outer peripheral surface with an elastic material force. It can be produced by using a roll in which the part is formed continuously and the width of the cut part in the direction perpendicular to the web 12 is the same as the width of the polymer supply port in the same direction.
- the long fibers are present in regions other than those indicated by the range RB.
- the absorbent body of the present invention is, for example, long at the front and rear end portions in the longitudinal direction of the absorbent body, like the respective absorbent bodies shown in FIGS. 6 (a), 6 (c) and 6 (d). While having the part which has a fiber force, it may have the part in which many short fibers derived from a long fiber exist among them. In that case, as shown in Fig. 6 (a), Fig. 6 (c), and Fig.
- the left and right sides of the absorber also have portions made of long fibers, and as a whole
- the part made of long fibers is short fiber It is preferable to enclose the area where the fiber is formed, but it may be one that does not have long fiber strength portions on both the left and right sides of the absorbent body.
- the range RB where the short fibers are generated shows excellent spot absorbability, so that the range RB faces the liquid excretion part of the wearer.
- an absorbent article such as a disposable diaper or sanitary napkin so as to be positioned at the site, the liquid excretion part force excreted liquid (urine, menstrual blood, etc.) is narrow in the absorber 10 It is absorbed smoothly from the range and is stably held by the absorbent polymer present in the part.
- the absorbent body when a large amount of liquid is supplied or a large amount of liquid is absorbed by the absorbent body, when the liquid reaches both sides in the longitudinal direction of the absorbent body, the long fibers oriented in the longitudinal direction of the absorbent body The liquid diffuses well in the longitudinal direction of the absorbent body (the wearer's longitudinal direction), and the wide range of the absorbent body is effectively used, while the diffusion of the absorbent body in the width direction is suppressed.
- FIG. 7 is a view showing an absorbent body according to still another embodiment of the present invention.
- the bulky absorbent polymer 13 is unevenly distributed on a part in the thickness direction of the absorbent body, that is, on one side of the upper and lower surfaces. Then, long fibers are cut and a large number of short fibers 122 are generated in substantially the entire region in which the absorbent polymer 13 is distributed in the plane direction of the web 12.
- the absorbent polymer 13 is dispersed in the central region in the width direction of the strip-shaped long fiber web having a width approximately twice the width of the absorbent body 10A, and the central region is made of elastic material and metal. After pressing and compressing between them, the long fibers in the central region are cut into short fibers 122, and then the portions located on both outer sides of the central region are folded back and stacked on the central region. It is obtained from Kotoko.
- the absorbent body 10A is preferably incorporated in the absorbent article so as to be positioned on the skin side of the wearer's skin where the massive absorbent polymer 13 on both the upper and lower surfaces is unevenly distributed.
- FIGS. 8 to 10 are views showing a state in which an absorbent body 104 according to still another embodiment of the present invention is incorporated in a pants-type disposable diaper 101.
- This disposable diaper 101 is an embodiment of the absorbent article of the present invention.
- the disposable diaper 101 includes a liquid-permeable top sheet 102, a liquid-impermeable or water-repellent back sheet 103, and a liquid-retaining absorbent 104 positioned between the two sheets 102 and 103.
- An absorbent main body 105 and an exterior body 110 that is positioned on the outer side (non-skin contact surface side) of the absorbent main body 105 and that bonds and fixes the absorbent main body 105 are provided.
- the exterior body 110 has a waist opening and a pair of redder openings in which both side edges of the portion located on the ventral side A are joined to both side edges of the portion located on the back side B. It is in the form of Figure 8
- FIG. 2 shows a state in which the joint portion is peeled off, the diaper is developed in a planar shape, and the elastic member of each portion is extended.
- the exterior body 110 also includes two sheets 111 and 112, and elastic members and caps of each part fixed between the two sheets.
- the disposable diaper 101 there are two sheets of M-Mil, 112, a waist elastic member 171 that forms a waist gather at the periphery of the waist opening, and a periphery of the redder opening.
- the waist elastic members 191 forming one are fixed in an extended state.
- Each elastic member 71, 81, 91 is joined by a joining means such as a hot-melt adhesive.
- the sheet 111 has extending portions extending from the front and rear end edges of the sheet 112 in the diaper front-rear direction, and each of the extending portions has the absorbent main body 105 disposed on the sheet 112 of the exterior body 110. After that, the absorbent body 105 is folded and bonded to the absorbent body 105 so as to cover the front and rear ends of the absorbent body 105.
- the absorbent body 104 of the present embodiment configures the first absorbent core 141 constituting the non-skin contact surface side of the absorbent body 104 and the skin contact surface side of the absorbent body 104. And a second absorption core 142.
- the first absorbent core 141 is disposed on the non-skin contact surface side of the second absorbent core 142.
- the second absorbent core 142 includes a long-fiber web and massive particles contained in the web, and the particles are distributed in the plane direction of the web. In at least part of the range, the long fibers are cut to form a large number of short fibers.
- the second absorbent core 142 has a rectangular shape in plan view, and has a length over the substantially entire length of the absorbent main body 105 including the absorbent body 104 and a width slightly smaller than the width of the absorbent main body 105. ing.
- the first absorbent core 141 has a substantially rectangular shape when seen in a plan view. However, the first absorbent core 141 is deformed into a three-dimensional shape of the absorbent body 104 on the left and right of the portion arranged in the crotch C of the diaper 101. It has missing parts 144 and 144 that make For the deformation of the absorbent body 104 into the three-dimensional shape, the absorbent body 104 is deformed so as to form a concave shape in the cross section in the diaper width direction (for example, the cross section shown in FIG. 10). A typical example is a longitudinal deformation that deforms to form a concave shape in the cross section, and a composite deformation that combines these two deformations.
- the missing portion 144 in the present embodiment is located along the longitudinal direction of the absorber 104 at a portion spaced from the side edge portion 143 of the absorber 104 in the crotch C. It is formed to extend.
- the central position in the longitudinal direction of the diaper is a position that bisects the overall length in the longitudinal direction of the diaper that has been unfolded and extended, and is the position of line III-III in FIG.
- both ends 144a and 144b in the longitudinal direction of the missing portion 144 in the first absorbent core 141 are open to the side edge portion 143 of the absorber 104. Therefore, the first absorption core 141 is divided into a plurality of parts. That is, the crotch C is divided into a central piece 141M located in the center of the absorbent body 104 in the width direction, and the crotch C is divided into left and right side pieces 141S and 141S located on both sides of the central piece 141M. Yes.
- the missing part includes a gap generated between a plurality of divided pieces as in the missing part 144 of the present embodiment.
- the second absorbent core 142 at the center in the width direction of the crotch C of the diaper 101 which is the excretory part facing part of the diaper 101, has a short length due to long fibers.
- Many fibers 122 are produced. More specifically, short fibers derived from long fibers are generated in a portion overlapping the portion between the left and right missing portions 144, 144 in the first absorbent core 141 (the portion that also has the central piece 141M force).
- the long fiber 121 constituting the web maintains the shape of the long fiber, and the liquid in the diaper width direction is not Diffusion is suppressed and the side leakage prevention property is improved.
- the first absorbent core 141 overlaps with a portion located between the left and right missing portions 144, 144 (portion that also has the central piece 141M force), and the side piece 141S. , 141F is a short fiber derived from long fiber.
- the portion overlapping the left and right missing portions 144, 144 even when the long fiber 121 constituting the web is in the form of maintaining the form of the long fiber, the same effect as the diaper can be exhibited. .
- the first absorbent core 141 in the present embodiment is arranged so as to overlap the non-skin contact surface side of the second absorbent core 142.
- the missing portions 144 and 144 are located below the second absorbent core 142.
- the skin contact surface side of the absorbent body is the surface side of the absorbent body that faces the wearer's skin when worn, and the non-skin contact surface side of the absorbent body is the both sides of the absorbent body. Of these, it is the side facing away from the wearer's skin when worn.
- the deformability of the absorber into the three-dimensional shape is improved because the first absorbent core 141 has the missing portion 144.
- Both side portions of the absorbent body 104 specifically, portions located on both sides of the central piece 141M of the first absorbent core 141, easily stand up toward the wearer's skin side when the diaper is worn.
- both sides of the absorbent body 104 stand up well and form an ideal three-dimensional shape that wraps around the urination part, and the action of the central piece 141M located at the center in the width direction of the absorbent body 104 makes it possible to From the viewpoint of preventing kinking of the absorber, the distance W3 between the side edge portion 143 of the absorber and the missing portion 144 (position of the missing portion near the center in the diaper width direction) in the diaper width direction (see Fig. 8) ) Is preferably 10 to 40% of the width W (see FIG. 8) of the absorber 104, and preferably 20 to 30%.
- the width W4 between the left and right missing parts 144 (see Fig. 8) is 20-120mm, especially 40-: LOOmm force ⁇ Preferred! / ⁇ .
- the width of the missing part 144 is preferably 3 to 20 mm, especially 5 to 15 mm. Further, the length of the missing portion 144 in the longitudinal direction of the diaper (in this embodiment, the side piece 141 S is the same as the length of the diaper in the infant's diaper (10-35cm, especially 15-30cm). It is recommended for adult diapers, 15-55cm, especially 20-50c. m is preferred.
- the bending rigidity in the diaper width direction of the first absorbent core 141 and the second absorbent core 142 is smaller in the second absorbent core 142 than in the first absorbent core 41.
- the second absorbent core 142 preferably has a bending rigidity in the diaper width direction that is 10 to 5 Og, particularly 20 to 40 g smaller than that of the first absorbent core 141.
- the second absorbent core 142 has a bending rigidity in the diaper width direction of 50 g or less, particularly preferably 40 g or less.
- First absorption core (first absorption core) F41 has a bending rigidity in the diaper width direction. Is preferably 30 to 80 g, particularly 40 to 70 g.
- the bending stiffness of the first absorbent core and the second absorbent core in the diaper width direction can be measured as follows.
- the bending stiffness value can be measured with a handle meter.
- the measuring method using the handle meter conforms to the Japanese Industrial Standard “JIS L-1096 (—General Textile Testing Method)”.
- JIS L-1096 General Textile Testing Method
- An absorbent body cut to 150 mm in the longitudinal direction and 100 mm in the width direction is placed on the support base with a 30 mm width groove in the direction perpendicular to the groove. Press the center of the absorber with a blade with a thickness of 2mm, and measure the resistance value (g) when the absorber is pushed in 8mm with a load cell.
- the equipment used in this invention is a hand tester (handle meter method) HOM-2 manufactured by Daiei Scientific Instruments. The average of 3 points is taken as the measured value.
- the absorbent body 104 in the present embodiment as a whole has a vertically long rectangular plan view shape in the front-rear direction of the diaper. Further, the absorbent body 104 is fixed between the top sheet 102 and the back sheet 103 in a state where the absorbent body 104 is entirely covered with a tissue paper or a water permeable wrap sheet (not shown) having a water permeable nonwoven fabric. ing.
- the surface sheet 102 in the diaper 101 is such that portions extending from both side edges of the absorbent body 104 are wound around the non-skin contact surface of the absorbent body 104, and the absorbent body.
- the non-skin contact surface side is fixed to the back sheet 103 with an adhesive (not shown).
- Each of the first absorbent core 141 and the second absorbent core 142 may be covered with a wrap sheet.
- the first absorbent core 141 and the second absorbent core 142 may be partially bonded with an adhesive or the like, and may or may not be bonded.
- Leak-proof cuffs 106 are provided on both sides of the absorbent main body 105 in the longitudinal direction of the disposable diaper 101 so as to extend in the longitudinal direction of the diaper.
- the leak-proof cuff 106 is formed by a leak-proof cuff forming sheet 160 and an elastic member 161 fixed to the leak-proof cuff forming sheet 160 in an expanded state.
- the leak-proof cuff forming sheet 160 is preferably disposed so as to cover both side edges 105c of the absorbent main body 105.
- a leak-proof cuff having standing property can be formed in the crotch part, and due to the presence of the leak-proof cuff, the side edge of the absorbent main body is attached to the wearer. It means that it is in direct contact with your skin.
- the leak-proof cuff forming sheet 160 is applied to the ventral portion A and the back portion B (preferably the crotch portion C) of the diaper 101 in the expanded and extended state (see FIG. 8).
- the diaper absorbent main body 105 is preferably arranged so as to extend from the skin contact surface side 105a to the non-skin contact surface side 105b.
- the leak-proof cuff forming sheet 160 is fixed to the skin contact surface side 105b of the absorbent main body 105 in each of the abdominal part A and the back part B. With such a configuration, the leak-proof cuff is easy to wrap around both sides of the absorbent main body, and the leak-proof property is improved.
- the skin contact surface side 105a is the surface of the absorbent main body 105 that faces toward the wearer's skin when worn, and the non-skin contact surface side 105b of the absorbent main body 105 is the absorbency. Of the two sides of the main body 105, the side facing the opposite side to the wearer's skin when worn.
- leak-proof cuff 106 can stand at least in crotch C.
- a plurality of elastic members 161 are fixed along the free end 162 in the vicinity of the free end 162 of the leak-proof cuff 106.
- the sheet 160 for forming a leak-proof cuff is folded in two at the bent portions 163 and 164 on the stomach side A and the back side B, respectively, and is in a trifold state. Above, it is fixed by known joining means (heat seal, adhesive, etc.).
- a sheet-shaped water-repellent sheet having a predetermined width is folded as a leak-proof cuff forming sheet 160 in two along a fold line along its longitudinal direction, and the opposite layers are hot-melted.
- a two-layered sheet bonded with a mold adhesive or partial heat or ultrasonic seal is used.
- the elastic member 161 is fixed in an expanded state between the layers of the two-layer structure sheet.
- the absorbent main body 105 in the crotch portion C is provided with a leak-proof cuff 106 at a position inside the diaper width direction with respect to both side edges 105c in the width direction of the absorbent main body 105.
- the fixing part 167 connects the leak-proof cuff forming sheet 160 and the extended part of the surface sheet 102 that has been wound down by known joining means such as heat sealing, high-frequency sealing, ultrasonic sealing, and hot-melt adhesive. It is formed by joining.
- an elastic member 166 for raising the side part of the absorbent main body is disposed in an extended state at a portion of the absorbent main body 105 on the outer side in the diaper width direction than the fixed portion 167.
- the elastic members 166 are arranged on both side edges of the absorbent main body 105 so as to extend along the side edges and between the ventral side A and the back side B.
- the elastic member 166 in the disposable diaper 101 according to the present embodiment is not particularly limited as long as the elastic member 166 is outside the force fixing portion 167 disposed on both side edges of the absorbent main body 105, and the absorbent body. It can also be arranged between 104 and the top sheet 102 located on the skin contact surface side, between the absorber 104 and the back sheet 103, inside the wrap sheet (not shown) of the absorber 104, and the like. It can be placed in more than one of these two locations. However, it is preferable that the absorbent main body 105 be disposed on both side edges or in the vicinity thereof.
- the fixing part 167 is preferably 5 to 50 mm from both side edge parts 105c of the absorbent main body 105, particularly about 10 to 30 mm, and is present at a site that enters the inside of the diaper width direction.
- the position P1 of the fixed end of the leak-proof cuff 106 is the position of the missing part 144 (the central end of the missing part 144 in the diaper width direction).
- the position of the part is preferably substantially the same as P2.
- the fixed end of the leak-proof cuff 106 is a portion where the absorbent main body 105 and the leak-proof cuff forming sheet 160 are joined, which exists on the opposite side of the free end of the leak-proof cuff 106.
- Absorbent body 5 due to the fact that the positions P1 and P2 As a result, it is possible to further improve the leakage prevention performance because the absorbent body can more easily form an ideal three-dimensional shape that wraps around the urination part.
- the distance between both the positions PI and P2 is taken into account. This includes cases where L (see Fig. 10) is within 10 mm.
- the distance W4 between the side edge portion 141 and the missing portion 144 of the absorber 104 described above, the width W of the absorber, the width W3 between the left and right missing portions 144, the width of the missing portion, the absorbent main body 105 of the fixing portion 167 A preferable numerical range such as a distance from both side edges 105c and a distance between the positions PI and P2 is measured at a central position in the longitudinal direction of the diaper.
- the presence of the elastic member 166, the absorbent main body 105, and the leakage-proofing force can be obtained in consideration of the fact that both side portions of the absorber 104 can be easily bent and raised.
- FIG. 10 due to the fixing portion with the forming sheet 160 being in a specific position, between the both sides of the absorbent body 104 or the both sides of the absorbent body that stands up, A concave pocket structure is formed.
- the pocket structure makes it difficult for excrement to leak out, and when the large amount of urine is excreted in a short period of time, or when watery stools or loose stools that are difficult to absorb are excreted, the concave structure It is difficult for the excrement to leak from the pocket structure. Further, even when leaking from the concave pocket, the leak-proof cuff 106 covering the side edge of the absorbent main body 105 is present, so that leakage from the diaper is prevented. That is, even if excrement exceeds the side edge of the absorbent main body standing upright at the crotch, this leak-proof cuff should be positioned outside it to prevent further excrement leakage. Because it can, it has excellent leakage performance. In addition, since the side edge of the absorbent main body is in direct contact with the wearer's skin when worn by the leak-proof cuff 106, a sense of incongruity during wearing can be prevented.
- the crotch part C is a part that is particularly susceptible to pressure from the left and right forces due to the movement of the wearer, and the compression force applied from the left and right by the movement of the wearer in that part is applied to the absorber 104. Since both sides are relieved by standing up, the pad stiffness (such as the anti-slip effect) of the absorber 104 can be improved.
- the missing part 144 is opened by the movement of the wearer spreading his legs or twisting the upper body,
- the missing portion 44 of the first absorbent core 141 is a low-rigidity second absorbent core 14 2
- the second absorbent core 142 covers the gap formed between the central piece 141M of the first absorbent core 141 and the side edge portion, and excrement is prevented from leaking through this gap.
- the side leakage prevention performance can be dramatically improved, so that the main body absorbs while improving the leakage prevention performance or suppressing the deterioration. It is possible to improve the fit by narrowing the width of the sleeve and the width of the crotch. Such an effect is that the leak-proof cuff 106 in the crotch C can stand up to the wearer's skin and secure a sufficient height, and even if it is crushed, it has a substantial liquid absorption surface. Combined with the fact that it is difficult to narrow it, it is played more reliably.
- the short fibers contained in the second absorbent core and the massive particles dispersed to generate the short fibers are biased to the central portion in the width direction.
- the disposable diaper having a narrow crotch width for example, a disposable diaper that satisfies the following conditions is particularly preferred, and an example can be given.
- the width of the absorbent body 104; the maximum width at the back side B and the ventral side A is 60 to 140 mm, particularly 80 to 120 mm, the maximum width at the crotch is 50 to 140 mm, and the special width is 70 to 120 mm.
- Reference numeral 109 in FIGS. 9 and 10 is an adhesive that joins the absorbent main body 105 and the exterior body 110.
- the first absorbent core 141 used in the present embodiment is such that the liquid diffusion rate in the diaper width direction is faster than the liquid diffusion rate in the diaper longitudinal direction until the liquid reaches the front end of the diaper. It is preferable from the point that the pre-leakage prevention performance is improved by taking time.
- FIGS. 13 to 17 are views showing an absorbent body according to still another embodiment of the present invention. Each absorber 10B shown in FIGS. 13 to 17: The LOF includes short fibers in the hatched portions in each figure.
- an upper fiber layer 91 mainly composed of short fibers and a lower fiber layer 92 mainly composed of long fibers are laminated.
- the absorbent core 9 having a two-layer structure fiber aggregate force and a wrap sheet (not shown) covering the absorbent core 9 are also provided. Similar to the absorbent body 10 shown in FIGS. 1 and 2, the wrap sheet covers the upper and lower surfaces of the absorbent core 9 and both sides in the longitudinal direction.
- An “absorber comprising a fiber assembly including long fibers and short fibers that are synthetic or semi-synthetic fibers” means that an absorbent core having a fiber assembly force, such as the absorber 10B, is It may be covered with a simple wrap sheet.
- the short fibers in the absorbent body 10B are unevenly distributed in the upper fiber layer 91 disposed on the skin side of the wearer when incorporated in the absorbent article, and the long fibers are worn by the wearer when incorporated in the absorbent article. It is unevenly distributed in the lower fiber layer 92 disposed on the opposite side to the skin side. That is, the long fibers and the short fibers are unevenly distributed in different parts in the thickness direction of the absorbent body.
- the proportion of short fibers having a fiber length of less than 70 mm in the constituent fibers is preferably 50 to 100% on a weight basis, more preferably 60 to 100%, still more preferably 80 to: LOO%.
- the proportion of long fibers having a fiber length of more than 70 mm in the constituent fibers is preferably 50 to 100% on a weight basis, more preferably 60 to 100%, still more preferably 80 to 100%.
- the upper fiber layer 91 containing short fibers exhibits excellent spot absorptivity.
- an absorbent article such as a disposable diaper or sanitary napkin so that it is located at the part facing the liquid excretion part
- the liquid excreted in the liquid excretion part (urine, menstrual blood, etc.) Can be absorbed smoothly into the absorber.
- the liquid is disposed on both sides in the longitudinal direction of the absorbent body or on the non-skin contact surface side of the upper fiber layer 91.
- the long fibers used allow the liquid to diffuse well in the longitudinal direction of the absorbent body (front and back direction of the wearer) and effectively use a wide area of the absorbent body, while suppressing the diffusion of the absorbent body in the width direction. As a result, excellent side leakage prevention performance can be obtained.
- the width of the upper fiber layer 91 is narrower than the width of the lower fiber layer 92, but the width of the upper fiber layer 91 may be substantially the same as the width of the lower fiber layer 92.
- Each absorbent body 10C shown in Figs. 14 to 17: LOF is composed of an absorbent core 9 composed of a single-layer fiber assembly 93, a wrap sheet (not shown) and a force covering the absorbent core 9. It becomes.
- the wrap sheet covers the upper and lower surfaces of the absorbent core 9.
- the wrap sheet preferably covers the upper and lower surfaces of the portion 9S where at least the short fibers of the absorbent core 9 are unevenly distributed.
- the absorbent body 10C shown in Fig. 14 (a) and Fig. 14 (b) has a portion 9S in which short fibers are unevenly distributed on one end side in the longitudinal direction of the absorbent core 9 made of the fiber assembly 93, A portion 9L in which long fibers are unevenly distributed is provided on the other end side in the longitudinal direction. Distributing the short fiber 9S on the crotch part of the disposable diaper over the abdomen, and arranging the 9L uneven fiber 9L on the back side of the diaper provides excellent spot absorption at the crotch of the diaper. And so-called pre-leakage (leakage caused by abdominal side force) can be effectively prevented. On the other hand, if the front and rear sides of the absorber are arranged in reverse, so-called rear leakage can be effectively prevented.
- the absorbent body 10D shown in Figs. 15 (a) and 15 (b) has a horseshoe-shaped portion 9S in which short fibers are unevenly distributed on one end side in the longitudinal direction of the absorbent core 9 made of the fiber assembly 93. And has a portion 9L in which long fibers are unevenly distributed on the other end side in the longitudinal direction.
- the absorbent polymer is unevenly distributed on the side of the portion 9S in the longitudinal direction.
- This absorbent body 10D is absorbed by absorbing the urine preferentially on the ventral side by incorporating the portion 9L side in the longitudinal direction into the diaper facing the back side (back side) of the wearer.
- the polymer can be held, and by increasing the thickness of the portion, it is possible to prevent soft stool from flowing to the front side of the buttocks side force beyond the crotch.
- the absorbent body 10E shown in FIGS. 16 (a) and 16 (b) has a portion 9S in which short fibers are unevenly distributed at the center in the width direction of the absorbent core 9 made of the fiber assembly 93. On both sides of the portion 9S, there are portions 9L in which long fibers are unevenly distributed.
- the portion 9S where the short fibers are unevenly distributed has a ratio of short fibers having a fiber length of less than 70 mm in the constituent fibers of 50 to L00% by weight. Is preferably 60 to 100%, more preferably 80 to 100%.
- the ratio of the preferable short fibers is the portion including the short fibers derived from the long fibers in the long fiber web 12 of the absorbent body 10 shown in FIGS. The same applies to (the portion located in the central region M) and the above-described absorbers IOC and 10D.
- the long fiber is unevenly distributed and does not substantially contain the short fiber, or the portion 9L containing a small amount of short fiber and no force compared to the portion 9S includes the fiber in the constituent fibers.
- the ratio force of long fibers exceeding 70 mm in length is preferably 50 to 100% by weight, more preferably 60 to L00%, and still more preferably 80 to L00%.
- the elastic members for raising both side portions of the absorbent body 10E are the skin contact surface side, the non-skin contact surface side of the absorbent body 10E, the vicinity of the side edge of the absorbent body 10E, the inside of the absorbent body 10 and the like. Can be mentioned.
- the portion 9S in which short fibers are present is dispersed in the absorbent core 9 made of the fiber assembly 93.
- the presence of a plurality of parts containing short fibers in a random or regular pattern allows the parts containing short fibers to absorb and swell quickly, and the bulge caused by the swelling causes the skin and diaper to remain after swelling. The air permeability between them is maintained well.
- FIG. 17 (b) instead of dispersing the portion 9S where the short fibers are present in the fiber assembly composed of a single layer, as shown in FIG.
- Absorbent core 9 is composed of fiber layers 91 and 92, and one layer 92 is mainly composed of long fibers.
- the other layer 91 may be a short fiber-based layer having a number of divided pieces.
- the part 9S containing short fibers contains only a small amount of short fibers!
- it is preferable that the absorbent polymer is not substantially contained in the portion 9L containing a small amount of short fibers and no force.
- substantially means that the amount of absorbent polymer in 9L is less than 1Z10 compared to the amount of absorbent polymer contained in 9S, and that the absorbent polymer that was intended to be placed in the 9S part during the manufacturing process. Including the case where it is unintentionally mixed in a small amount of 9L.
- the absorbent polymer By disposing the absorbent polymer in this way, the 9S portion is raised compared to the 9L portion, and air permeability can be ensured.
- the short fibers in the absorbent bodies 10B to 10F are all synthetic or semi-synthetic fibers.
- Synthetic fibers that can be used as short fibers include polyethylene, polypropylene, polyethylene terephthalate, polybutylene terephthalate, polytetramethylene terephthalate, nylon, acrylic fiber, vinylon, etc. alone or in combination (eccentric and concentric core-sheath type, It can be used in a side-by-side type.
- semisynthetic fibers that can be used as short fibers include rayon, cellulose triacetate, and Z or cellulose diacetate.
- Synthetic and semi-synthetic fibers can be used individually or in combination of two or more of the above.
- the expression synthetic or semi-synthetic fiber also includes the combined use of synthetic fiber and semi-synthetic fiber.
- Absorbent body 10B The LOF is not produced by cutting the long fibers with massive particles, and the LOF is different from the absorbent body 10 of the first embodiment described above. Differently.
- the upper fiber layer 91 in the absorbent body 10B shown in FIG. 13 (a) and FIG. 13 (b) has a card web manufactured using a card machine, an air laid web using air, or a wet web using water. Can be configured.
- the fibers that make up the card web It is already short fiber at the stage of supplying raw cotton.
- the lower fiber layer 92 in the absorbent body 10B can have a web force obtained by opening the tow in the same manner as the above-described absorbent body manufacturing method.
- a web force obtained by tearing a web obtained by melt spinning, such as spunbond, or a film obtained by melting and extruding a resin (stretched as necessary) can be used.
- Fig. 18 (a) is a diagram showing an example of a manufacturing method of the absorbent body 10B.
- the short fiber 122A weighed by the hopper 94 is supplied to the card machine 95 to obtain a strip-shaped card web 91A, and the non-aggregate absorbent polymer is formed on the web 91A.
- the long fiber web 12 obtained by opening the tow is stacked on the polymer spray surface of the web 91A, and then the laminate is placed between a pair of rollers 96, 96. Insert and pressurize in the thickness direction. The pressurization by the pair of rollers 96, 96 is performed under the condition that the thickness of the laminate is reduced and the shape retention is improved, but the long fibers are not substantially cut.
- the lap sheet After pressing with a pair of rollers 96, 96, the lap sheet is supplied by a wrap sheet supply mechanism (not shown) to cover the laminate, and then cut into a length corresponding to one absorber to absorb the above-described absorption. A large number of bodies 10B are obtained continuously.
- the absorbent polymer 13 is supplied so as to be sandwiched between the card web 91A and the long fiber web 12, and in the obtained absorbent body 10B, The absorbent polymer is unevenly distributed in the vicinity of the boundary between the upper absorbent layer 91 and the lower absorbent layer 92 in the thickness direction of the absorbent body.
- Fig. 18 (b) is a diagram showing an example of a method for producing the absorber 10C ⁇ : LOF.
- the long fiber web 12 obtained by opening the tow is continuously conveyed, and the web 12 is stacked on the stretchable sheet 14a.
- the web 12 on which the absorbent polymer 13 is dispersed is passed between a pair of rollers 97 and 97, and the absorbent polymer 13 is pushed into the web 12.
- the long fibers in the web 12 are partially cut through a long fiber cutting device 98.
- the long fiber cutting device 98 is capable of cutting long fibers regardless of the presence or absence of massive particles.
- the long fiber cutting device 98 includes a pressurizing portion having cutting protrusions on the peripheral surface or surface thereof.
- the pressing part is pressed against the web 12 in a state of being sandwiched between the sheets 14a and 14b, it is possible to use one configured to cut the long fibers in the part pressed by the cutting projection.
- the elongating sheets 14a and 14b do not easily perforate the sheet even when pressed with the cutting protrusions.
- FIG. 19 shows an example of the arrangement of the cutting protrusions of the cutting device 98 when the absorbent body 10E shown in FIGS. 16 (a) and 16 (b) is manufactured.
- the arrangement of the cutting projections formed on (the surface of the pressure part) is shown by unfolding the roll.
- cutting protrusions are formed in a staggered arrangement in the portion 98M corresponding to the center portion in the width direction of the web 12, and by pressing the web 12 with the portion 98M, the web 12 A large number of short fibers can be produced in the central region.
- the projections for cutting are not formed on the portions 98S and 98S corresponding to the both side portions of the web 12, and short fibers are not substantially generated in the left and right side regions of the web 12.
- the absorbers IOC, 10D, and 10F can be manufactured in the same manner except that the arrangement of the cutting protrusions formed on the surface of the pressure unit is changed.
- the distribution pattern of the massive particles in the production method shown in FIG. 4 is changed, and the range of the hatched portion in each figure of the absorbent body shown in FIGS. And an absorbent body in which short fibers derived from long fibers are produced.
- FIG. 20 is a diagram showing a method for manufacturing an absorbent body according to still another embodiment of the present invention.
- a long fiber web 12 obtained by opening a tow is supplied to a long fiber cutting device 99, and the long fiber is partially cut by the cutting device 99 to obtain a long fiber.
- the short fibers, the long fibers that have been cut, and the web that has the force are formed into a web based on the speed ratio between the pair of rolls 310, 311 and the cutting device 99. Pull and stretch. At this time, incompletely cut fibers are cut to form short fibers.
- the stretched state of the web is relaxed between the pair of rolls 310, 311 and the vacuum conveyor 32, and the absorbent web is sucked onto the relaxed web from the opposite side by the vacuum conveyor 32.
- Supply polymer 13 Then, a lap sheet is supplied by a wrap sheet supply mechanism (not shown) to cover the laminate, and then the absorbent body Cut to the length of the sheet.
- the cutting device 99 can be used without particular limitation as long as it can cut fibers.
- a rotary die cutter, a press cutting blade, or a laser can be used.
- an absorbent body comprising a fiber assembly including long fibers and short fibers derived from long fibers, in which long fibers and short fibers are mixed, is obtained.
- the constituent fibers are not bonded to each other in the fiber assembly including the short fibers or the long fiber web because the swelling of the absorbent polymer is not inhibited.
- the term “bond” refers to a state in which fibers are fused and united, and the bond cannot be removed even when the water-absorbing polymer swells, and the fibers are intertwined with each other. The state in which the fibers are stuck together by the Noinda and the binding is loosened or detached by excretion, and the fibers can move by swelling of the water-absorbing polymer is not included in the “bonding”.
- a long fiber web containing short fibers derived from long fibers and an absorbent polymer may be laminated with a piled product containing fluff pulp.
- the absorbent fiber shown in FIGS. 1 and 2 and the long fiber web 12 in the absorbent bodies shown in FIGS. 6 (a) to 6 (e) are laminated on a piled fabric containing fluff pulp, and the whole of these is laminated. It can also be coated with a wrap sheet to form an absorber.
- Such an absorbent body is preferably used by being incorporated into an absorbent article so that the long fiber web 12 is located on the skin side of the wearer.
- the first absorbent core 141 in the absorbent body 104 described above also serves as a piled cloth containing fluff pulp.
- a piled product containing fluff pulp a piled product of flap pulp only, a mixed product of fluff pulp and absorbent polymer particles, fluff norp and heat-fusible synthetic fiber are mixed and integrated by heat treatment.
- the content of flap pulp in the piled product containing fluff pulp can be, for example, 50 to: LOO mass%.
- the absorbent article of the present invention may include the above-described other absorbers in place of the above-described absorber 104. Further, instead of a pants-type disposable diaper, an unfolded disposable diaper may be used. Further, the absorbent body of the present invention may be disposed between an absorbent body having a general configuration in a conventional disposable diaper or the like and a surface sheet, and used as a so-called sublayer or second sheet.
- the absorbent article of the present invention comprising the absorbent body of each of the above embodiments may have two or more pairs of opposing solid gathers.
- elastic strands 221 extending in the longitudinal direction of the absorbent article are arranged in an extended state on the side edges of the reservoir fluff 220 extending laterally from the side edges of the absorbent body 201, and the redder gather 222
- a first three-dimensional gear gather 223 and a second three-dimensional gather 224 having a base end portion are disposed between the redder gather 222 and the side edge portion of the absorbent body 201.
- the first three-dimensional gather 223 is arranged near the redder gear and the second three-dimensional gather 224 is arranged near the absorber.
- These three gathers located in the redder flap 222 are arranged so that the contraction force of the outermost gear gather is larger than the contraction force of the gathers located inward. It is preferable to adjust the force. That is, it is preferable that L1> L2, L3, where L1 is the contraction force of Redder gather 222, L2 is the contraction force of first solid gather 223, and L3 is the contraction force of second solid gather 224. In particular, it is preferable that the gather contraction force gradually decreases as the outermost gather is directed inward. That is, it is preferable that L1> L2> L3. The reason is as follows.
- the conventional design method for absorbent articles is to reduce the thickness of the absorbent article and increase the gather contraction force in order to prevent the liquid from leaking. It was based on the idea of not leaving a gap between them. However, if the contraction force of the gathers is too strong, the traces can easily touch the skin. In addition, as in the present invention, it is thin, flexible, and absorbent. In such a case, the absorbent article shrinks due to the shrinkage force of the gathers, making it difficult to wear. Further, if the gather contraction force is too strong, a downward force due to the contraction force acts on the absorbent article during the mounting of the absorbent article, and the shift tends to occur.
- the gather contraction force is measured by the following method. Cut the gather from the absorbent article and use it as the measurement sample. Use Tensilon ORIENTEC RTC-1150A to draw a hysteresis curve of the measurement sample. The stress at the return of this hysteresis curve is defined as the contraction force. The speed of pulling and returning is 300mmZmin. The initial length of the sample is 100 mm, and the maximum elongation is 100 mm (twice the original length). The stress when the hysteresis curve returns is the value measured when the specimen is returned 50 mm from the maximum elongation. The measurement is the average of 5 points. If the maximum elongation is less than 100 mm, the elongation shall be up to 50 mm, and the value at that time shall be the measured value.
- two sets of redder gathers and a pair of opposing three-dimensional gathers are used.
- two or more pairs of opposing three-dimensional gears may be used without using redder gathers.
- FIG. 12 two sets of three-dimensional gathers, a first three-dimensional gather 223 and a second three-dimensional gather 224, are used. In this case as well, it is preferable to gradually reduce the contraction force of the three-dimensional gathers from the outside in the width direction of the absorbent article to the inside for the same reason as described above.
- the absorbent body 10G shown in FIG. 22 includes an absorbent core 11 including a fiber web 12, and the fiber web 12 is mainly composed of synthetic or semi-synthetic fibers and is a synthetic or semi-synthetic fiber.
- the fiber A first fiber group that is less than force a second fiber group that has a ratio of 1Z4 or more and less than 2Z4, a third fiber group that has a ratio of 2Z4 or more and less than 3Z4, and the ratio is 3Z4 or more
- the fibers of three or more fiber groups of the first to fourth fiber groups are included. 22 is a schematic cross-sectional view taken along the line II-II of the absorbent body 10 shown in FIG.
- the absorbent body 10G includes an absorbent core 11 and a wrap sheet 14 that covers the absorbent core 11.
- the absorbent core 11 is also a fiber web 12 and an absorbent polymer 13 contained in the fiber web 12.
- the fiber web 12 includes fibers having various lengths from fibers having a sufficiently short length with respect to the entire length L of the absorbent core 11 to fibers having a length substantially the same as the entire length L.
- the fiber web 12 is mainly composed of synthetic or semi-synthetic fibers.
- the constituent fibers that are synthetic or semi-synthetic fibers are used as the total length of the absorbent core 11.
- the first fiber group whose ratio is less than 1Z4
- the second fiber group whose ratio is 1Z4 or more and less than 2Z4
- the ratio is 2Z4 or more and less than 3Z4
- the fibers include three or more fiber groups of the first to fourth fiber groups. Whether or not to use the standard.
- the absorbent body 10G has excellent spot absorbability. In addition, even when an external force is applied during use, it is less likely to be destroyed or distorted. More preferably, the fiber web 12 includes fibers of all fiber groups of the first to fourth fiber groups.
- the fibers classified into the first fiber group When the fibers classified into the first fiber group are included, it is possible to exhibit the spot absorptivity and thereby improve the absorption rate.
- the strength of the absorber increases due to the intertwining of fibers of a certain length in addition to the appearance of spot absorbability, which is added during use. Destruction against external force can be suppressed.
- Including the fibers classified into the third fiber group prevents the absorbent body from partially swelling by spreading the liquid more widely in the plane direction of the absorbent body. Suppresses skin troubles and prevents leakage due to partial capacity overload.
- the inclusion of fibers classified into the fourth fiber group has the advantages of stabilizing the overall structure of the absorbent body (preventing slippage) and improving line transportability in the manufacturing process.
- the force related to the absorption of liquid in the absorber is the capillary force of the fiber assembly (of course, the absorption power of the superabsorbent polymer and the capillary force acting between the superabsorbent polymer and the superabsorbent polymer.
- the capillary force of the fiber assembly of course, the absorption power of the superabsorbent polymer and the capillary force acting between the superabsorbent polymer and the superabsorbent polymer.
- Absorption by the absorber is thought to be entangled with the effects of these capillary forces and external forces. That is, during excretion, the pressure of urination is applied as a force related to the absorption of the liquid.
- the fiber web 12 includes fibers of three or more fiber groups out of the first to fourth fiber groups can be determined as follows.
- a region R of, for example, 200 X 100 mm (longitudinal direction X width direction) is set on the fiber web 12 constituting the absorbent core 11, and tweezers are inserted from the region R. Use to pick out 30 fibers at random. Then, the fiber length of each fiber is measured, and based on the measured value, each fiber is classified into any one of the first to fourth fiber groups.
- each of the 1st-4th fiber group when the fiber classified into the fiber group is multiple, it judges that the fiber of the fiber group is included.
- each of the three or more fiber groups of the first to fourth fiber groups includes the fibers of the fiber group
- “three or more of the first to fourth fiber groups” It contains the fibers of the fiber group.
- each of all the fiber groups of the first to fourth fiber groups includes the fibers of the fiber group
- “all of the first to fourth fiber groups” It is judged that it includes the fibers of the fiber group.
- the size of the region R is appropriately changed depending on the size and shape of the absorbent body (in the case where the fibrous web is disposed on a part of the absorbent body, the size and shape of the fibrous web).
- the dimension in the longitudinal direction is set to a dimension that exceeds at least 1Z2 of the total length of the absorbent body (or fiber web). More specifically,
- the maximum width that can be taken over the entire length of the absorbent body (or fiber web) is the length of the region R.
- the width is different, and the absorbent body (or fiber web) has a different width in the longitudinal direction (for example, T-shaped, I
- the width of the narrowest part is the width of the region R.
- the sampling position on the absorbent body (or fiber web) should be the center of the region R at the crotch (the lowest part of the body) when worn.
- the region R is set by avoiding the missing part by directing the front side of the absorbent body (or fiber web).
- the dimension of the region R is set based on the above index except for the missing portion.
- the longitudinal direction of the absorbent body (or fiber web) is the longest V constituting the fiber web, and the fiber group is oriented.
- the direction in which the fiber is oriented in a specific direction is the longitudinal direction of the absorbent article.
- the fibers of the first to fourth fiber groups are in the plane direction of the fiber web 12, or they overlap at all in the thickness direction, or In the case of partial overlap, the region R is divided into 3 blocks each in length and width and 9 blocks in the system, and 3 fibers are sampled from each block, and the fiber length distribution of the entire absorbent body is measured. Determine whether it contains fibers from more than 3 of the 4th fiber groups.
- fibers classified into the first fiber group it is particularly preferable to contain fibers classified into the first fiber group.
- fibers that are classified into the fourth fiber group from the viewpoint of improving the stability of the structure of the entire absorbent body (preventing stagnation) and improving line transportability in the manufacturing process. And are preferred. From the viewpoint of the total strength, it is preferable that the fibers of all sections of the first to fourth fiber groups are included.
- the first to fourth fiber groups in the constituent fibers of the fiber web 12 The ratio of the fibers to be classified is preferably 0 to 80%, 0 to 80%, 0 to 80%, and 0 to 50% in this order, 10 to 60%, 10 to 60%, and 10 to 60. % And 5-30% more preferred than power! /.
- three or more groups of fibers selected from the group of the first to fourth fibers are unevenly distributed! /.
- the size of the absorbent core 11 is appropriately determined according to the use of the absorbent body 4 and is not particularly limited.
- the total length L of the absorbent core is 100 to 600 mm in the case of diapers for infants, In particular, 150 to 500 mm force S is preferable, and in the case of a sanitary napkin or a light incontinence pad in which 250 to 900 mm, particularly 300 to 800 mm is preferable in the case of an adult diaper, 50 to 500 mm, particularly 70 to 450 mm is preferable.
- the fiber web 12 in the present embodiment is obtained from a crimped long-fiber web 12A as described in the production method described later. Therefore, the fiber taken out from the fiber web includes a crimped fiber. When measuring the fiber length of such a fiber, it is measured in a state including the crimp. That is, the fiber length of the crimped fiber is the same as the “original fiber length” in the crimping rate measurement method described later.
- the fiber web 12 preferably includes crimped fibers as in the present embodiment.
- the crimp rate (JIS L0208) of the fiber is preferably 10 to 90%, more preferably 10 to 60%, and still more preferably 10 to 50%.
- the crimping of the constituent fibers of the fiber web 12 makes the absorbent body 10G flexible and easily deformed as a whole.For example, when it is incorporated in an absorbent article, When deformed into a concave shape to improve leakage resistance, the deformability to the concave shape can be enhanced. Further, since the fiber web 12 contains crimped fibers, the absorbent polymer or the like is more stably held in the fiber web, and the absorbent polymer moves in the web or the web force is also dropped. This is also suppressed.
- the preferred crimp rate described above is preferably satisfied by at least the fibers of the first fiber group. More preferably, the first and the longest fibers contained in the absorbent body, more preferably, the fibers of all fiber groups contained in the absorbent body are filled.
- the crimp of the fiber can be two-dimensional or three-dimensional!
- the crimp rate of the fiber is defined as a percentage of the difference between the length A when the fiber is stretched and the length B of the original fiber with respect to the length A when stretched. Is calculated from
- Crimp rate ((A—B) ZA) X 100 (%)
- the length of the original fiber refers to a length in which the fiber is in a natural state and both ends of the fiber are connected by a straight line.
- the natural state is a state where one end of the fiber is fixed to a horizontal plate and hung downward by its own weight.
- the length when the fiber is stretched is the length at the minimum load when the fiber is stretched until there is no crimp.
- the crimp rate of the fiber is as described above, and the number of crimps is preferably 2 to 25, particularly 4 to 20, particularly 10 to 20 per lcm.
- the absorbent body 10G of the present embodiment will be further described.
- the absorbent body 10G has a rectangular shape in plan view, and in the state of being incorporated in an absorbent article, the longitudinal direction of the absorbent body and the wear This matches the wearer's front-rear direction.
- the constituent fiber forces of the fiber web 12 are generally oriented in a specific direction in the plane (X direction in FIG. 22).
- the total length L of the absorbent core 11 is such that the constituent fibers of the fibrous web 12 (particularly the fibers of the longest group of fibers contained in the absorbent body) are generally in a specific direction within the plane (FIG. 22).
- the fibers of the first to fourth fiber groups in this embodiment are all composed of synthetic or semi-synthetic fibers.
- Synthetic fibers include polyethylene, polypropylene, polyethylene terephthalate, polybutylene terephthalate, polytetramethylene terephthalate, nylon, acrylic, etc. It is done.
- Examples of semisynthetic fibers include rayon, acetate (cellulose triacetate and cellulose diacetate), lyocell, tencel, and cupra. Synthetic and semi-synthetic fibers can be used individually or in combination of two or more of the above. The expression synthetic or semi-synthetic fiber also includes the combined use of synthetic fiber and semi-synthetic fiber.
- the fiber web is mainly composed of synthetic or semi-synthetic fibers, it has a wide range of control over fiber length, fiber diameter, and hydrophilicity compared to conventional absorbent bodies mainly composed of pulp fibers. It is possible to design an absorber with little liquid accumulation and liquid return, or less decrease in speed due to repeated absorption where there is no sag when wet, high compressive strength when wet! Therefore, since there is little liquid return, the fiber length and fiber diameter can be controlled, so that there is an advantage that it is difficult to break even if it is thin and can be easily joined to other members constituting the absorbent article.
- the fiber web 12 in the present embodiment has a synthetic or semi-synthetic fiber content of 100% in the fiber web 12, but the fiber web 12 may contain fibers other than synthetic or semi-synthetic fibers. good.
- the content of the synthetic or semi-synthetic fiber in the constituent fibers of the fiber web 12 is preferably 80 to: L00% by weight, particularly 90 to 100%.
- fibers other than synthetic or semi-synthetic fibers include pulp fibers and cotton fibers.
- the fibers of the first to fourth fiber groups constituting the fiber web 12 are preferably hydrophilic fibers.
- Hydrophilic fibers include both fibers that are inherently hydrophilic and fibers that are not inherently hydrophilic but have been rendered hydrophilic by being subjected to a hydrophilic treatment.
- the Preferred are fibers that are inherently hydrophilic, more preferred are fibers consisting of acetate and rayon, and acetate is particularly preferred because the bulkiness is maintained even when the web is wet.
- As the acetate it is preferred to use cellulose triacetate and Z or cellulose diacetate.
- the absorbent polymer 13 in the absorbent body 10G of the present embodiment is unevenly distributed in part of the planar direction of the absorbent body 10G. Specifically, as shown in FIG. 22 and FIG. 2, in a portion located in a region M (hereinafter also referred to as the center region M) having a predetermined width in the center in the width direction of the absorbent body 10G in the plane direction of the fiber web 12. It is unevenly distributed.
- Absorbent polymer 13 is the central region M Is distributed substantially uniformly in the portion located in the middle region M, but is not substantially present in the portions located in the outer side regions S, S of the central region M.
- the fibers 122 classified into the above-mentioned first fiber group are distributed substantially uniformly, and the fiber web 12 is divided into the first fiber group.
- the fibers (not shown) that are divided into the second to fourth fiber groups are also distributed in a range substantially the same as the distribution range of the fibers 122 to be formed. That is, in the central region M, fibers 121 divided into the first to fourth fiber groups are mixed.
- the absorbent body is more excellent in the expression of spot absorptivity and the resulting improvement in the absorption rate, the absorbent body strength, and the liquid diffusibility.
- spot absorptivity and liquid diffusivity are based on the above-mentioned [design to achieve both spot absorptivity and liquid diffusibility].
- the fiber web 12 in the side region S of the absorbent body 10G extends over the entire length of the force-absorbing core 11 of the constituent fibers, and is a fiber 121 divided into the above-described fourth fiber group. is there.
- the embodiment in which the fiber web 12 includes fibers of three or more fiber groups of the first to fourth fiber groups includes, for example, a distribution range of fibers divided into the first to fourth fiber groups. In the plane direction or the thickness direction of the fiber web 12, they are completely overlapped! /, although there are cases, the distribution range force of the fibers of three or more fiber groups of the first to fourth fiber groups is included. It is preferable that the fiber web 12 overlaps at least part of the plane direction or thickness direction of the web 12! In the present embodiment, all of the fibers of the first to fourth fiber groups may be mixed with only the fibers of the first to third fiber groups in the force center area M distributed in the force center area M. it can.
- the width W1 of the range in which the fibers of the first to third fiber groups exist, or the range in which all of the fibers of the first to fourth fiber groups exist (the central region M in this embodiment) is
- the total width W of the absorber 4 is preferably 20 to 100%, preferably 50 to 90%.
- the absorbent polymer 13 various known absorbent polymers conventionally used in absorbent bodies such as disposable diapers and sanitary napkins can be used.
- the material of the absorbent polymer 13 include poly (sodium acrylate), ((butyl alcohol acrylate) copolymer, crosslinked poly (sodium acrylate), (starch-acrylic acid) graft polymer, (iso (Butylene maleic anhydride) copolymer and its kenne, potassium polyacrylate, and cesium polyacrylate.
- the absorbent polymer 13 has a physiological water absorption amount of 30 gZg or more, particularly 30 to 50 gZg by centrifugal dehydration.
- the point power which prevents that a gel feeling falls is also preferable.
- the absorbent polymer has a liquid passage time of 20 seconds or less, particularly 2 to 15 seconds, particularly 4 to 10 seconds, to prevent the occurrence of gel blocking and the resulting decrease in absorption performance. Also, it is preferable from the viewpoint of preventing leakage due to liquid leakage due to inadequate absorption! /.
- the fiber web 12 preferably contains fibers that are divided into the first or second fiber group having a short fiber length.
- the kinking of the absorber inhibits stable performance and leads to a sense of incongruity at the time of wearing. This occurs when the absorber is subjected to stress and is unable to relieve the stress.
- stress applied to a part of the absorbent body reaches the entire absorbent body through the fibers, so that the entire absorbent body is kinked.
- the fiber web 12 contains fibers of the first to third fiber groups, when a tensile force or a compressive force is applied to a part of the absorbent body 10G during use of the absorbent body 10G, the force However, it does not reach the entire absorber, and it becomes distorted.
- a water-permeable sheet material such as tissue paper or a water-permeable nonwoven fabric is preferably used.
- the absorber 10G is manufactured in the same manner as the method of manufacturing the absorber 10 described above using the absorber manufacturing apparatus shown in FIG.
- the manufacturing apparatus of the absorbent body shown in FIG. 23 and the manufacturing method of the absorbent body 10G using the same are not particularly described, similar to the manufacturing apparatus of the absorbent body shown in FIG. 4 and the manufacturing method of the absorbent body 10 using the same. It is.
- the absorbent polymer is sprayed on the web 12A having a long fiber strength obtained by opening the tow 12a. That is, the absorbent polymer 13 is used as the particles. It is preferable to use a superabsorbent polymer that is at least partially agglomerated.
- the bulky absorbent polymer is obtained by casting an absorbent polymer-containing gel polymerized by an aqueous solution polymerization into a plate shape and then pulverizing it after drying, or by using a reverse phase suspension polymerization method to determine the type of surfactant and stirring force. By controlling, the amorphous particles are aggregated. On the other hand, there are spherical and plural spherical aggregates, fibers and scales.
- the average particle size of the bulk absorbent polymer (and the bulk particles other than the absorbent polymer) is 150-600 ⁇ m, especially 200-500 ⁇ m.
- organic and inorganic particles such as cellulose powder, activated carbon, silica, alumina and various clay minerals (zeolite, sepiolite, bentonite, cantalinite, hectorite, smectite, etc.) (Deodorant and antibacterial agent) can also be used.
- inorganic particles those partially substituted with metal sites can be used. These may be used as an aggregate, or may be used in combination with another carrier. These particles can be used in combination of two or more.
- the average diameter of the aggregate or the complex with the carrier should be 150-600 ⁇ m, especially 200-500 ⁇ m.
- the absorbent polymer 13 is dispersed only in a region having a predetermined width in the center in the width direction of the web 12A. Further, the absorbent polymer 13 is continuously sprayed in the longitudinal direction of the web 12A.
- the strength density of the absorbent polymer 13 varies with the length of long fibers in the long fiber cutting described below. From the viewpoint of cutting into a long length to produce the fibers classified into the first to third fiber groups described above, the force is preferably 0.5 to 0.8 g / cm 3 force, preferably 0.55 to 0.7 g / cm 3 power ⁇ better than! / ⁇ .
- the particle size distribution of the absorbent polymer 13 is determined from the viewpoint of producing the fibers of the first to third fiber groups described above by cutting the long fibers into various lengths in the long fiber cutting described below. It is preferable that the average particle diameter is in the range of 250 to 450 ⁇ m, and the presence ratio of particles of 425 ⁇ m or more is 5 to 40%. Further, the presence of particles of 425 ⁇ m or more A ratio of 10 to 35% is more preferable for efficiently cutting the fiber and suppressing the roughness of the absorbent body. Since particles having a large particle size are difficult to be densely packed, the fibers are easily cut when the fibers are sandwiched between the superabsorbent polymers or between the superabsorbent polymer rolls.
- the superabsorbent polymer 13 can be sprayed by a method of giving a basis weight distribution that is continuous in the longitudinal direction or a method of spraying discontinuously in the longitudinal direction.
- the ratio of the superabsorbent polymer to the long fibers is at least the same amount, preferably at least twice, more preferably at least three times. Therefore, when giving a continuous and basis weight distribution, in the longitudinal direction, the same amount or more, preferably 2 times or more, more preferably 3 times as much as the region A in which the ratio of the superabsorbent polymer to the long fibers is less than the same amount. Divided into the above-mentioned area B.
- the higher the basis weight of the superabsorbent polymer the higher the probability of fiber cutting and shorter fibers.
- the abundance ratio and distribution of the fibers of the first to third fiber groups can be controlled.
- a short fiber for example, a fiber of the first fiber group
- the force S that can exert the spot absorbency and thereby improve the absorption rate while the liquid concentrates.
- liquid return increases. Therefore, this problem can be solved by distributing many superabsorbent polymers in the region where the fibers of the first fiber group are present.
- the fibers of the third fiber group in the presence region of longer fibers, for example, the fibers of the third fiber group, it has a function of diffusing liquid over a wide range in the plane direction of the absorbent body. It is effective to design with higher diffusivity utilizing orientation.
- granular superabsorbent polymer is less likely to cut fibers, so a mixture of bulk superabsorbent polymer and granular superabsorbent polymer is used.
- the distribution of the fiber length can also be controlled by separating the region where the massive superabsorbent polymer is dispersed and the region where the particulate superabsorbent polymer is dispersed.
- fiber cutting can be controlled by the ratio of superabsorbent polymer to fiber, similarly, when the amount of superabsorbent polymer is constant, the fiber length distribution can also be controlled by changing the amount of fiber. I can do it. In other words, the area should be set so that the amount of fiber is less than the same amount as the superabsorbent polymer (fiber is easy to cut! Thus, it is possible to provide a region in which some of the fibers are cut and some of them are not cut.
- Examples of a method for causing a lot of relatively short fibers to exist include the following methods.
- set the roll surface hardness to a low value for example, lower the JIS hardness of rubber.
- a low value for example, lower the JIS hardness of rubber.
- reduce the diameter of the mouthpiece examples include increasing the linear pressure, combining these rolls, and passing the rolls multiple times.
- the fiber or the superabsorbent polymer bites into the roll surface and promotes cutting.
- a wrap sheet 14 having a sufficient width to cover both the upper and lower surfaces of the web 12A is used as the wrap sheet 14.
- the wrap sheet 14 has portions 14a and 14a extending from both side edges of the web 12 after the absorbent polymer 13 has been supplied to the web 12.
- the upper side is also covered with a wrap sheet.
- various materials conventionally used for enveloping the absorbent core can be used without particular limitation.
- the absorbent continuous body 100 is compressed and compressed by the above-described long fiber cutting mechanism 8 and the long fibers are cut.
- This pressure compression and the cutting of the long fibers are performed by passing the absorbent body continuous body 100 through a pair of rolls 80 and 81, and in the thickness direction of the entire area or a part of the web 12A where the absorbent polymer 13 is dispersed. Caro pressure is applied.
- the long fiber is cut in a range where the absorbent polymer 13 is dispersed, and between the outer peripheral surface 80M made of an elastic material of one roll 80 and the outer peripheral surface made of a hard material of the other roll 81. Occurs in the sandwiched and pressurized area.
- This long fiber cut is shown in Figure 5.
- the long fiber 121 is pressed against the massive absorbent polymer 13 and the absorbent continuous body 100 in which the long fibers in a part of the web 12A are cut is cut from the absorbent continuous body.
- the absorbent article 10G is cut into a desired dimension according to the type and dimension of the absorbent article into which it is incorporated.
- the absorber 10G having the above-described form can be efficiently and continuously produced in this manner.
- the long fibers used in the present invention are generally called continuous filaments.
- a bundle of continuous filaments is generally called a tow. Therefore, the long fiber in the present invention is a concept including a continuous filament.
- the fiber strength is 3 g from the viewpoint of cutting a long fiber by compressing and compressing a long fiber web in the presence of massive particles (such as massive absorbent polymer).
- Zd or less is preferred 0.5 to 2.5 gZd is preferred.
- the fiber strength is measured as follows.
- JIS L1015 chemical fiber staple test method The test was performed in accordance with the tensile strength section. That is, one fiber was attached to a copy sheet so that the length (space distance) of the unfixed portion of the fiber was 20 mm (10 mm when the fiber was short). Specifically, each end of the fiber is attached to an 18 mm wide adhesive tape (Nichiban Co., Ltd.'s scotch tape (Products) so that the distance between the adhesive tapes is 20 mm (or 10 mm for short fibers). Name)] was fixed to the copy paper.
- This sample was attached to a chuck of a tensile tester, the paper was cut in the vicinity of the upper and lower adhesive tapes, and used for a tensile test.
- the apparatus used was an ORIENTEC RTC-1150A type Tensilon tensile tester. The measurement range was switched appropriately using a full scale 5 kg load cell. The pulling speed was 300mmZmin. Measurement was performed at 10 points, and the average value was taken as the measured value. Measurements were added, except for measurements that were 20% or more above the average value.
- the fineness of the long fibers is preferably 1.0 to LOdtex, particularly preferably 1.5 to 8 dtex.
- the fibers of the first to fourth fiber groups obtained by the production method of the present embodiment are not aligned in the longitudinal direction of the absorbent body at the positions of the longitudinal ends (cut ends). Located in the Random.
- the fibers of the first to fourth fiber groups obtained by the production method of the present embodiment are not joined to each other, but can be joined.
- a method of joining after or before the cutting process of long fibers, a method of thermally fusing the intersections of fibers by hot air treatment such as an air-through method, a method of performing heat embossing, or spraying or coating various binders and plasticizers And so on.
- An adhesive may be used for joining the fibers.
- the first cutting mechanism 8A includes a cutter roll 383 having a large number of blades 382 on the peripheral surface, and an anvil roll 384 that receives the blades of the roll 382 on the peripheral surface, and a web 12A introduced between both rolls.
- the first cutting mechanism 308B includes a cutter roll 387 having a large number of blades 386 on its peripheral surface, and a plurality of first cutting portions 385 in which long fibers are cut (first cutting step). And an anvil roll 388 that receives the blade of 387 on the peripheral surface, and a plurality of second cut portions 389 in which long fibers are cut are formed on the web 12A ′ introduced between the two rolls (second cut). Process).
- the first cutting section 385 includes a cutting section row 385L having a plurality of cutting section forces in series in the width direction of the web 12A, at regular intervals in the flow direction of the web 12A.
- the cut portions of adjacent cut portion rows are formed so that the positions in the width direction of the web 12A are shifted by a half pitch of the cut portion pitch in each cut portion row.
- the second cut portions 389 are formed so as to occur at a constant interval in the flow direction of the web 12A, a cut portion row 3981 ⁇ having a plurality of cutting portion forces arranged obliquely with respect to the longitudinal direction of the web 12A.
- the positions in the width direction of the web 12A are shifted from each other by a distance shorter than the half pitch of the cut portions of the cut portion rows of the first cut portions.
- the long fibers can be cut into various lengths by sequentially cutting the long fibers in the long fiber web by the first and second cutting processes in which the formation patterns of the cutting portions are different.
- the fiber web 12 containing the fiber of the 3rd fiber group can be obtained easily.
- the aggregated or non-agglomerated absorbent polymer 13 is sprayed on the obtained fiber web 12, it is an embodiment of the present invention if it is cut to the length of one absorbent article.
- An absorber (not shown) is obtained.
- a single wrap sheet 14 is joined to one side of the web before cutting the long fiber web, and after the absorbent polymer 13 is sprayed, another wrap sheet (not shown) is used. ), And the fiber web 12 is coated with these two wrap sheets, and then cut to the length of one absorbent article.
- the fiber length and distribution can be easily controlled.
- a lap sheet (not shown) is joined to one side of the long-fiber web 12A obtained in the same manner as in the embodiment shown in FIG. 23, and then this laminate is cut.
- the long fiber is cut by mechanism 308C.
- the cutting mechanism 38C includes a pressing roll 392 having a large number of convex portions 391 on the peripheral surface, and a smooth peripheral receiving roll 393 disposed opposite to the roll, and a web 12A introduced between the two rolls. Apply pressure between the convex part 391 and the peripheral surface of the roll 393. Cut the long fiber to be placed.
- the aggregated or non-agglomerated absorbent polymer 13 is sprayed on the obtained fiber web 12, it is cut into a length corresponding to one absorbent article, which is an embodiment of the present invention.
- An absorber (not shown) is obtained.
- a single wrap sheet 14 is joined to one side of the web before cutting the long fiber web, and after the absorbent polymer 13 is sprayed, another wrap sheet (not shown) is used. ), And the fiber web 12 is coated with these two wrap sheets, and then cut to the length of one absorbent article.
- an absorbent body of the present embodiment it is possible to independently control the distribution of the superabsorbent polymer and the fiber distribution.
- the criteria for classifying the synthetic or semi-synthetic fibers that are constituent fibers into the first to fourth fiber groups are different from those of the absorbent body of the first invention. That is, in the second invention, the constituent fibers (synthetic or semi-synthetic fiber) of the fiber web sampled in the same manner as in the first invention are divided into the first fiber group having a fiber length of less than 25 mm and the fiber length. It is divided into a second fiber group having a fiber length of 50 mm or more and less than 50 mm, a third fiber group having a fiber length of 50 mm or more and less than 100 mm, and a fourth fiber group having a fiber length of 100 mm or more.
- the absorbent body of the second invention includes fibers of three or more fiber groups out of the first to fourth fiber groups thus divided.
- the absorbent body as an embodiment of the second invention and a manufacturing method thereof are the first to fourth fiber groups classified according to the criteria in the first invention. Instead of including or generating these fibers, those that include or generate the fibers of the first to fourth fiber groups classified according to the criteria of the second invention may be mentioned.
- the second invention is the same as the first invention, except that the constituent fiber, which is a synthetic or semi-synthetic fiber, is changed to the first to fourth fiber groups, and the preferred structure is the same as the first invention.
- the description of the first invention or the embodiment thereof described above is similarly applied.
- the absorbers of the first and second inventions and the production methods thereof are not limited to the above-described embodiments, and can be variously changed.
- the above-described absorbent body 10G includes the first to fourth fiber webs 12 extending in the width direction of the force absorber 10G in which the first to fourth fibers are mixed in the fiber web 12 in the central region M. Mixing of fibers is acceptable.
- the fiber web 12 is composed of a plurality of web covers each including at least one kind of fibers of the first to fourth fibers, whereby the fiber web 12 having a fiber distribution in the thickness direction. Can be formed.
- the fiber web 12 may be laminated with a piled product including fluff pulp.
- the fiber web 12 and the piled fiber containing fluff norp may be laminated in a state where each is wrapped with a wrap sheet, or the fiber web 12 and the piled fiber containing fluff pulp are laminated.
- Such an absorbent body is preferably used by being incorporated in an absorbent material so that the fiber web 12 is located on the skin side of the wearer.
- a piled product containing fluff pulp a piled product of only flap pulp, a mixed pile of fluff pulp and absorbent polymer particles, fluff norp and heat-synthetic synthetic fiber are mixed and integrated by heat treatment.
- Mixed mixed fiber, fluff pulp, mixed fiber made by mixing absorbent polymer particles and heat-fusible synthetic fiber and integrated by heat treatment, fluff pulp stacked fiber, embossed, and embossed A mixed product of fluff pulp and absorbent polymer particles applied, a mixed product of fluff pulp subjected to water spraying treatment and absorbent polymer particles, and the like can be used.
- the content of flap pulp in the piled product containing fluff pulp can be, for example, 50 to: LOO mass%.
- a cutter roll as used in the embodiment shown in Figs. 24 and 25, the position of the blade of which is the pressing roll 392.
- the thing provided at random like the convex part of can be used.
- a pressing roll and a receiving roll as used in the embodiment shown in FIGS. 26 and 27 are used.
- Examples of the absorbent article into which the absorbent body according to the present invention is incorporated include disposable diapers, sanitary napkins, panty liners (orimono sheets), incontinence pads, and the like.
- the absorbent article generally includes a liquid-permeable top sheet, a liquid-impermeable or water-repellent back sheet, and an absorbent body interposed between these two sheets.
- FIG. 30 is a partially broken perspective view showing an embodiment of the absorbent body of the present invention.
- 31 is a cross-sectional view taken along line II-II in FIG.
- the absorbent body 10H shown in FIG. 30 includes, as shown in FIGS. 30 and 31, a web 413 including long fibers 411 and short fibers 412, and an absorbent core 415 including particles 414 contained in the web 41 3;
- the wrap sheet 416 that covers the absorbent core 415 also acts as a force. That is, the core 415 in the absorber 10H of this embodiment is a single layer.
- the absorbent body 10H has a rectangular shape in plan view, and the longitudinal direction of the absorbent body 10H matches the front / rear direction of the wearer at the time of wearing when the absorbent body 10H is incorporated in an absorbent article.
- the particles 414 included in the web 413 are particles of an absorbent polymer in the present embodiment.
- the absorbent polymer particles 414 are unevenly distributed in a part of the absorbent body 10H in the planar direction. Specifically, as shown in FIG. 30 and FIG. 31, in the planar direction of the absorber 10H, it is unevenly distributed in a region M having a predetermined width in the center in the width direction of the absorber 10H (hereinafter also referred to as “center region M”). is doing.
- the absorbent polymer 414 is substantially present in the lateral regions S 1, S 2 on both outer sides of the central region M, the force being distributed substantially uniformly in the central region M.
- Short fibers 412 are present in the area in which the absorbent polymer 414 is distributed in the plane direction of the web 413, that is, in the portion located in the central region M.
- long fibers 411 are present in portions of the web 413 located in the side regions S, S.
- the long fibers 411 and the short fibers 412 are unevenly distributed at different sites in the planar direction of the absorbent body 10H.
- the short fibers 412 present in the central region M are oriented in one direction in the plane of the absorber 10H. Yes.
- the long fibers 411 located in the side regions S and S are also oriented in one direction in the plane of the absorbent body 10H, like the short fibers 412.
- the orientation directions of the long fibers 411 and the short fibers 412 are the same. Specifically, both the long fibers 411 and the short fibers 412 are oriented in the longitudinal direction of the absorbent body 10H.
- the absorbent body 10H is a disposable diaper or sanitary napkin so that the central region M where the short fibers are present is located at the portion P facing the wearer's liquid excretion part. It is used by being incorporated into an absorbent article such as. Therefore, when the constituent fibers present in the central region M of the absorbent body 10H are oriented in the longitudinal direction of the absorbent body 10H, the liquid excreted in the central region M is absorbed from a narrow range of the absorbent body 10H. It is absorbed smoothly inside. Then, the liquid absorbed in the absorber 10H is absorbed by the absorbent polymer 414 unevenly distributed at the site, and is stably held in the absorber 10H.
- the constituent fibers in the central region M of the absorbent body 10H are set to have an overall orientation degree of 1.2 or more, and preferably 1.4 or more.
- the value of the degree of orientation is higher than the degree of orientation of the stable fiber in a web manufactured by a card machine using, for example, a stable fiber.
- the degree of orientation of the short fibers 412 is preferably set to 1.2 or more, more preferably 1.3 or more, and further preferably 1.4 or more.
- the degree of orientation is measured using Microwave molecular orientation analyzer MOA-2001A manufactured by KANZAKI. Before the measurement, prepare an absorber in a state where a load of 24.5 kPa is applied for 12 hours to eliminate the effects of thickness recovery and wrinkles. When removing the absorbent body from the product, remove the absorbent body from the product with the above-mentioned load applied, and apply the load to the absorbent body after removal. At this time, it is necessary to take out the absorber while maintaining the structure as much as possible so as not to cause an error in the measured value of the degree of orientation. For this purpose, for example, write a size frame to be sampled on the product beforehand, and take out the absorber so that the frame is distorted! /.
- the absorber is sampled along the longitudinal direction, and the longitudinal direction of the absorber is Set it so that it is in the vertical direction of the mounting part.
- the sampling size is set according to the equipment.
- the fiber may be oriented in either the longitudinal direction or the width direction of the absorbent body. To measure. If the measured value is within the above range, the fiber is oriented.
- the degree of orientation of only the short fibers or only the long fibers is measured by the following method. After measuring the degree of orientation of the web in advance, the abundance ratio of short fibers and long fibers at the measurement target location is measured. When short fibers or long fibers are present in a proportion exceeding 80%, the orientation degree of the entire web at the part is regarded as the orientation degree of fibers exceeding 80%. When the ratio of long fibers is Z and the ratio of short fibers is 20Z80 to 80Z20, the short fibers should be extracted from the sample piece so that they are evenly distributed in the plane of the absorber, and the degree of orientation should be measured. repeat.
- the ratio of long fibers to short fibers is calculated for each measurement stage from the amount of fibers extracted at each measurement stage, and the ratio of long fibers to short fibers is plotted against the degree of orientation. To do. Extrapolating from the obtained plot, the degree of orientation of short fibers or long fibers is calculated.
- the orientation degree of the long fibers 411 is preferably set to 1.2 or more, more preferably 1.4 or more.
- the measuring method of the orientation degree of the long fibers 411 is the same as the measuring method of the orientation degree of the short fibers 412. [0190] Specific means for orienting the long fibers 411 and the short fibers 412 will be described in the description of the manufacturing method of the absorbent body 10H.
- the basis weight of the long fiber 411 in the absorbent body 10H is preferably 10 ⁇ 100gZm 2.
- the basis weight of the short fiber 412 is preferably 10 to: LOOg Zm 2 .
- the weight ratio of long fiber 411 and short fiber 412 (the former Z the latter) is 5/95 to 80/20, especially 20/80 to 50/50.
- the basis weight of the absorbent polymer is preferably a 10 ⁇ 500gZm 2.
- the weight ratio of the web 413 including the long fibers 411 and the short fibers 412 to the absorbent polymer (the former Z and the latter) is preferably 1Z0.5 to 1Z15, particularly 1Z2 to 1Z10.
- the width of the range containing the absorbent polymer 414 in the width direction of the absorbent body 10H (same as the width of the central region M) W1 (see Fig. 30) is incorporated into the absorbent article and used. From the viewpoint of preventing side leakage at this time, it is preferably 20 to 95%, particularly 50 to 85% of the entire width W (see FIG. 30) of the absorbent body 10H.
- the width of the absorber 10H in the width direction where the absorbent polymer 414 is not contained (same as the width of the side region S) W2 (see FIG. 30) is 5 to 80% of the total width W of the absorber 10H. In particular, it is preferably 15 to 50%.
- the long fibers 411 are preferably crimped.
- the crimp rate (JIS L0208) of the long fiber 411 is preferably 10 to 90%, more preferably 10 to 60%, and still more preferably 10 to 50%.
- the crimping of the long fibers 411 makes the absorbent body 10H flexible and easy to deform as a whole, and fits to the wearer when incorporated into an absorbent article, or deforms into a concave shape. Therefore, it is possible to improve the deformability to the concave shape when improving leakage prevention.
- the short fibers 412 are also preferably crimped. It is preferable that the crimped short fiber 412 has a crimp rate comparable to that of the above-described crimped long fiber 411. Since the short fibers 412 are crimped, the absorbent polymer 414 is more stably held in the web 413, and it is effective that the polymer 414 moves in the web 413 or falls off the web 413. To be suppressed.
- the crimps of the long fibers 411 and the short fibers 412 may be two-dimensional or three-dimensional.
- the crimp ratio is the difference between the length A when the fiber is stretched and the length B of the original fiber. It is defined as a percentage of the length of the sword and is calculated from the following formula.
- Crimp rate ((A— B) ZA) X 100 (%)
- the length of the original fiber means a length in which the fiber is in a natural state and both ends of the fiber are connected by a straight line.
- the natural state is a state where one end of the fiber is fixed to a horizontal plate and hung downward by its own weight.
- the length when the fiber is stretched is the length at the minimum load when the fiber is stretched until there is no crimp.
- the crimp ratios of the long fibers 411 and the short fibers 412 are as described above, and the number of crimps is preferably 2 to 25, particularly 4 to 20, particularly 10 to 20 per lcm.
- the long fibers 411 preferably have hydrophilicity.
- the hydrophilic long fibers 411 include both fibers that are inherently hydrophilic and fibers that are not inherently hydrophilic but have been rendered hydrophilic by being subjected to a hydrophilic treatment. Is done.
- Preferred fibers that are inherently hydrophilic are acetate and rayon fibers, and acetate is particularly preferred because the bulkiness is maintained even when the web is wet.
- As the acetate it is preferable to use cell mouth triacetate and z or cellulose diacetate.
- nylon, acrylic fiber, or the like can be used as the hydrophilic long fiber 411.
- the short fibers 412 also have hydrophilicity like the long fibers 411.
- the constituent material and the like of the short fiber 412 the description described above with respect to the long fiber 411 is applied.
- the short fiber 412 may be composed of the same material as the long fiber 411 or may be different.
- the water content is less than 10%, particularly 1 to 8%. V is not plasticized, so it does not soften, or is not preferred because it does not swell!
- fibers with an excessively high moisture content are particularly absorbed by hydrogen bonding between fibers or between different parts of the same fiber because the fibers absorb moisture or the hydrophilicity of the fiber itself is strong.
- the long fiber is preferably 70 mm or more, more preferably 80 mm or more, and even more preferably 100 mm or more when the fiber length is measured by the average fiber length measurement method (Method C) of JIS L1015.
- Method C average fiber length measurement method
- the total length L of the web to be measured is less than 100 mm, for example, when the total length of the absorbent article is less than 100 mm, it is more preferably 50% or more with respect to the total length L of the web.
- the long fibers used in the present invention are generally called continuous filaments.
- a bundle of continuous filaments is generally called a tow. Therefore, the long fiber in the present invention is a concept including a continuous filament.
- the short fiber means a fiber having a fiber length S measured by the same measurement method as that for the long fiber S of less than 70 mm, more preferably 5 mm or more and less than 70 mm, and still more preferably 10 mm or more and 50 mm or less. That's right.
- Pulp fibers normally used in the art as absorbent bodies for absorbent articles are not included in the short fibers in the present invention. That is, the short fiber in the present invention is a fiber other than pulp fiber.
- the short fibers and the long fibers contained in the web 413 are preferably short fibers, long fibers or short fibers and long fibers are not joined.
- bonding means that the fibers are bonded to each other by bonding using an adhesive or the like over almost the entire web, and the bonding is maintained even when the liquid becomes wet after absorbing the liquid. It means the state.
- water-soluble binders when fibers are in a state of being bonded together when dried, the binder dissolves due to moisture, and the fibers can move freely.
- the adhesive is present at the interface between the web and the other member, and a very small part of the web is joined by the adhesive.
- the short fibers and the long fibers included in the web 413 may or may not be entangled between the short fibers, the long fibers, or the short fibers and the long fibers.
- the entanglement means include entanglement using a high-pressure water flow (water jet) and entanglement using a needle.
- the fineness of the long fibers 411 and the short fibers 412 is not particularly limited.
- Long fiber 411 and short fiber 412 have a fineness of 1.0 to: LOdtex, especially 1.5 to 8 dtex It is preferable.
- the fineness of the long fibers 411 and the short fibers 412 may be the same or different.
- particles of an absorbent polymer are preferably used.
- a massive superabsorbent polymer is preferred. Since the web of the present invention is highly oriented, it is difficult for the ratio of the superabsorbent polymer to the fiber to be difficult to be caught between the fiber and the superabsorbent polymer. Therefore, the shape of the superabsorbent polymer is a lump (cornered shape. Includes aggregates. When expressed in terms of force density, it is preferably 0.5 to 0.8 g / cm 3 , more preferably 0.6 to 0.8 g / cm 3 ), the entanglement with the fiber is increased and the web can be loaded with a highly absorbent polymer at a high concentration.
- Massive absorbent polymer particles can be obtained by casting an absorbent polymer-hydrated gel polymerized by an aqueous solution polymerization into a plate shape and then crushing it after drying. By controlling, it is formed by agglomeration of amorphous particles.
- the average particle size of the massive absorption '14 positomer is preferably 150 to 600 / ⁇ ⁇ , particularly 200 to 500 m.
- the average particle diameter of the massive particles 414 is 20 to 300 ⁇ m, particularly 50 to It is preferably 150 ⁇ m.
- the material of the absorbent polymer various known polymer materials that have been used in the past for absorbent bodies such as disposable diapers and sanitary napkins can be used.
- poly (sodium acrylate), (vinyl alcohol acrylate) copolymer, cross-linked poly (sodium acrylate), (starch-acrylic acid) graft polymer, (isobutylene maleic anhydride) copolymer and its kenne poly Examples include potassium acrylate and polycesium acrylate.
- the absorbable polymer has a saline water absorption of 30 gZg or more, particularly 30 to 50 gZ g by the centrifugal dehydration method, in order to prevent a reduction in the amount used and a decrease in gel feeling after liquid absorption. I prefer that.
- the method for measuring the amount of absorption of the absorbent polymer by centrifugal dehydration is as described above.
- an absorbent body having a highly oriented fibrous web has excellent liquid diffusibility.
- a highly absorbent polymer having high liquid permeability As the absorbent polymer, a polymer having high liquid permeability under load is more preferable from the viewpoint of effectively preventing the gel blocking.
- the absorbent polymer preferably has a flow rate value of 30 to 300 ml / min, more preferably 32 to 200 mlZmin, and still more preferably 35 to LOOmlZmin.
- a flow rate value of 30 to 300 ml / min, more preferably 32 to 200 mlZmin, and still more preferably 35 to LOOmlZmin.
- This load substantially corresponds to the body pressure applied to the absorbent body while wearing the absorbent article.
- a specific method for measuring the flow rate is described, for example, in paragraph 0005 of Japanese Patent Laid-Open No. 2003-235889.
- measurement is performed by changing 0.200 g, which is 0.20 g, which is the weight of the sample used in the measurement method described in this publication.
- the flow rate is measured according to the following procedure.
- Filtration cylindrical tube equipped with a metal net (mesh size 150 m) and a narrow tube (inner diameter 4 mm, length 8 cm) with a wire mesh (opening 2 mm) at the lower end of a vertically standing cylinder (inner diameter 25.4 mm) Prepare. With the cock closed, 0.32 g of a measurement sample adjusted to a particle size of 850 to 150; ⁇ ⁇ is charged into the cylindrical tube. Next, 50 ml of 0.9% by weight physiological saline is poured into the cylindrical tube.
- the absorbent polymer preferably has a sufficiently high absorption rate. As a result, the liquid can be reliably held even in the absorbent body 10H having enhanced liquid diffusibility due to the oriented fibers.
- the absorption rate of the absorbent polymer is expressed by the measured value by the VORTEX method.
- the VORTEX method is known as a method for showing the ability to fix a liquid when the superabsorbent polymer is forcibly exposed to the liquid.
- the DW method (Demand Wettability) method is known as a method for expressing the absorption rate of a superabsorbent polymer.
- the DW method is a method that evaluates both the force of sucking up the liquid and the force that the superabsorbent polymer takes into the gel at the same time.
- the diffusion of the liquid is performed. Therefore, it is preferable to use the VORTEX method, which is an evaluation method in which the liquid is forcibly exposed to the liquid rather than the force of sucking up the liquid.
- the absorption rate measured according to the VORTEX method is 5 to 60 seconds, preferably 10 to 50 seconds, and more preferably 15 to 40 seconds.
- VORTEX When the value of VORTEX is shorter than 5 seconds, the absorption rate of the superabsorbent polymer is too high, so that the liquid diffusibility, which is a feature of the present invention, is not sufficiently exhibited. In addition, if the value of VORT EX exceeds 60 seconds, the liquid may remain in the absorber, which may cause leakage.
- the VORTEX method was performed in accordance with JIS K7224-1996. That is, 50 g of 0.9 wt% sodium chloride aqueous solution (physiological saline, manufactured by Otsuka Pharmaceutical Co., Ltd.) was weighed in a beaker and stirred at 600 ⁇ 60 rotations per minute using a magnetic stirrer. 2.0 g of the superabsorbent polymer was put into the liquid at the center of the vortex, and the time until the stirrer chip was covered was measured.
- the evaluation of the absorption rate by the VORTEX method is evaluated by measuring the time, so that the shorter the measurement time, the faster the absorption rate is considered.
- the absorption rate and the absorption time are described with the same significance and should be appropriately replaced.
- the absorption rate can be designed by the shape, particle size, bulk density, degree of crosslinking, etc. of the superabsorbent polymer.
- the absorbent polymer particles may be non-spherical amorphous particles. Specifically, the method described in JP-A-7-184956, column 7, line 28 to column 9, line 6 can be used.
- a high-absorbency polymer having a high liquid passing rate and a high absorption rate alone.
- the liquid passing rate and the absorption rate are within the above desired range.
- These absorptive polymers may be mixed or coexisted.
- a relatively high liquid passing speed V and the absorbent polymer S 1 are mixed with an absorbent polymer S 2 having a relatively high absorption speed.
- the absorbent polymer S2 has higher absorption capacity and absorption rate, but has lower resistance to gel blocking.
- the absorbent polymer S1 and the absorbent polymer S2 coexist, the absorbent polymer S1, which is hard (that is, hard to cause gel blocking), enters between the absorbent polymer S2 with high absorption performance. Can be used.
- an absorbent polymer S3 having a relatively high flow rate and an absorbent polymer S4 having a relatively high absorption rate coexist.
- the absorbent polymer S3, which has a high flow rate is placed near the urine portion of the absorbent article (the second to fourth from the ventral side when the absorbent is roughly divided into 5 parts in the length direction).
- the absorbent polymer S4 By disposing the absorbent polymer S4 in the vicinity of the front end portion and the rear end portion, it is possible to further increase the liquid uptake speed of the absorber and also improve the liquid fixing ability.
- the superabsorbent polymer S3 having a high flow rate is formed by placing the absorber in the middle of the absorber (when the absorber is roughly divided into five equal parts in the length direction, the second to fourth positions from the ventral side and the absorber When it is divided into five equal parts in the width direction, it is placed in the middle part (near the 2nd to 4th parts excluding both ends), so that the absorption speed is high! Can also be arranged.
- the same effect can be obtained by arranging the superabsorbent polymer S3 having a high liquid velocity on the top sheet side and the superabsorbent polymer S4 having a high absorption rate on the backsheet side.
- various buffering agents can be included so that a buffer system is established when excrement is absorbed by the absorbent body 10H. That is, various organic and inorganic buffers, that is, acetic acid, phosphoric acid, succinic acid, succinic acid, adipic acid, malic acid, lactic acid, or salts thereof can be used alone or in combination, or various amino acids can be used. . Ma
- various organic and inorganic buffering agents have the effect of neutralizing excrement, for example, ammonia generated by the decomposition of urine, and keeping the diaper neutral to weakly acidic. Even if there is a liquid return of the excrement, the influence on the skin can be reduced.
- various organic and inorganic buffering agents have a function of neutralizing alkali such as ammonia, so long fibers
- the particles 414 instead of or in addition to the above-described absorbent polymer particles, for example, cellulose powder, activated carbon, silica, alumina, various clay minerals (zeolite, sepiolite, bentonite, cantalinite, etc.), etc.
- Organic and inorganic particles can be used.
- the inorganic particles those partially substituted with metal sites can be used. These may be used in combination with another carrier which may be used as an aggregate. Two or more kinds of these particles can be used in combination.
- the average diameter of the aggregate with the agglomerate or carrier is preferably 150 to 600 / ⁇ ⁇ , particularly 200 to 500 m.
- the function of these components is to suppress the odor of excreta absorbed by the absorber 10H and the odor derived from the material.
- hydrophilic fine powder can coexist in the web 413.
- the hydrophilic fine powder include cellulose powder, carboxymethyl cellulose and its metal salt, carboxyethyl cellulose and its metal salt, hydroxyethyl cellulose and its derivative, which are fibrillated or fibrillated.
- examples include silk powder and nylon powder. Among these, it is preferable to use cellulose powder because the above effect can be improved to the maximum.
- the hydrophilic fine powder may be mixed with an absorbent polymer that may be spread on the web before the absorbent polymer is spread, and both may be spread simultaneously on the web.
- the shape of the embossed part is determined by the drawability and design of the liquid, such as a circle, rectangle, square, or line.
- the long fiber existing region is subjected to an embossing process that blocks the diffusibility of the liquid, for example, a linear embossing process that extends in a direction perpendicular to the direction in which the fibers are oriented. I like to give it to you.
- the web is formed on or in the upper and / or lower sides of the web 413, or in addition to or instead of the web.
- One side or the other side of 413 is a sheet material such as non-woven paper, or a sheet material is overlapped or covered, and a method of joining the web 413 and the sheet material with an adhesive, or a method of heat-sealing. It is done. According to this method, a sheet-like absorbent body in which the web 413 is sandwiched and fixed between a pair of sheet materials can be obtained.
- Such a sheet-like absorber has a high rigidity due to the bonding with the sheet material and the rigidity of the sheet material itself, thereby improving the handleability, so that it can be easily conveyed by itself. Can do. Moreover, since this sheet-like absorbent body can be easily cut into a desired shape or removed from the body, an absorbent body corresponding to the shape of the absorbent article can be easily produced.
- an adhesive is added so as not to impair the water permeability, softness, and air permeability of the web 413. It is preferable to apply.
- hydrophilic adhesive Either a hydrophilic adhesive or a hydrophobic adhesive that is not particularly limited in the type of adhesive can be used. Particularly preferred is a hydrophilic adhesive.
- hydrophilic adhesives include cycloflex (National Starch and Chemi, Delaware, USA), which is a hydrophilic hot melt adhesive. Registered trademark of Cal Co.).
- the surfaces of each other are mainly bonded to each other. However, some of the adhesive may sink into the web 413 and bond the fibers inside the web 413 in the thickness direction. is there.
- Stacking the sheet material on the web 413 and Z or below is also advantageous from the viewpoint of improving the absorption performance of the absorbent body 10H.
- various fiber sheets and fiber webs as the sheet material. Examples include air-through nonwoven fabric, airlaid nonwoven fabric, dry pulp nonwoven fabric, crosslinked pulp and paper containing crosslinked pulp, and composites thereof. These sheet materials may be used singly or as a plurality of sheets.
- the fibers constituting these sheet materials have a fiber diameter of 1.7 to 12 dtex, particularly 2.2 to 7.8 dtex, particularly 3.3 to 5.6 dtex.
- the amount of soot is preferably 15 to 200 g / m 2 , in particular 20 to 150 g / m 2 , in particular 25 to 120 g / m 2 .
- the basis weight should be 15 ⁇ : LOOgZm 2 , Special 20 ⁇ It is preferably 80 gZm 2 , particularly 25 to 50 g / m 2 .
- the basis weight should be 25 to 200 g, particularly 30 to 150 g / m 2 , especially 40 to 120 g / m 2 .
- a water-permeable sheet material such as a pulp sheet such as tissue paper or a water-permeable nonwoven fabric is preferably used.
- the absorbent body manufacturing apparatus shown in the figure has a continuous filament tow 41 la that is continuously conveyed and stretched in the longitudinal direction for opening to obtain a opened tow 41 lb.
- Tension relaxation mechanism that transports lb to the supply position of polymer 414 in a relaxed state 3
- Fiber cutting mechanism that cuts continuous filaments in a part of 41 lb of opened fiber tow 408, 41 lb on one side of opened fiber tow
- a wrap sheet supply mechanism 404 for supplying the wrap sheet 416, an absorbent polymer supply mechanism 6 for supplying the absorbent polymer 414 from the surface opposite to the wrap sheet 416 side to the opening tow 41 lb on the wrap sheet 416, Wrap sheet 416, open toe 41 lb on both sides
- the folded portions 7 416 a and 416 a are folded back, and a folding mechanism 7 that covers both sides of the opened tow 41 lb with the wrap sheet 416 is provided.
- the opening mechanism 402 has the same configuration as that in the absorbent body manufacturing apparatus shown in Fig. 4 and Fig. 23 described above, and opens the tow 41la in the same manner.
- the long fibers constituting the open tow 41 lb are intertwined with each other and in a highly oriented state.
- the long fiber cutting mechanism 408 includes a pair of rolls 480 and 481 that press and compress in the thickness direction across 41 lb of the opening tow! Ronole 480, 481 ⁇ Cross center in the width direction ⁇ Coo! / ⁇ , meshing with each other, forming a gear shape, and when the web is sandwiched between the gears, some fibers of the web are cut and short fibers Form.
- the width of the meshing portions of the rolls 480 and 481 in the direction perpendicular to the absorber continuous body 100 is substantially the same as the width in the same direction of the polymer supply port. At this time, the uncut long fibers remain at both ends of the web in the width direction, and are responsible for the tension of the entire web. Note that a tension relaxation mechanism 403, which will be described later, is adjusted together with the influence of the long fiber cutting mechanism 408.
- the continuous filament cutting method includes, for example, a method in which a spread tow is squeezed into a plurality of rolls with a large number of slits as described above, a method using a cutter blade, other methods such as water flow and laser. For example, a known method can be used. Since the continuous filament F has a crimp, even if a part of the continuous filament F is cut, the fibers are intertwined with each other, so that the continuous filament F can be carried on a conveyor or the like.
- the tension relaxation mechanism 403 includes a feed roll 31 and a vacuum conveyor 32 that are arranged downstream of the fiber spreader 23.
- the feed roll 31 includes a pair of rolls 310 and 311 that are rotationally driven at a peripheral speed lower than the peripheral speed V2 of the bloomer roll 26.
- the feed roll 31 was made by opening a tow 41 lb obtained by opening the tow 41 la by the opening mechanism 2 and extending the tension between the pretensioning roll 25 and the bloomer roll 26 to increase the tension. It is supplied on the lap sheet 416 supplied on the vacuum conveyor 32 in a state where the tension is relaxed rather than the tow in the state.
- the vacuum conveyor 32 includes a breathable endless belt 320 driven by a feed speed V4 that is slower than the feed speed V3 of the feed roll 31 (the circumferential speed of the pair of rolls 310 and 311), and a vacuum box 321. .
- the spread tow 41 lb supplied on the wrap sheet 416 on the vacuum conveyor 3 2 is kept in a relaxed state. Further, it is further conveyed by the endless belt 320 and conveyed to the polymer supply position.
- the wrap sheet supply mechanism 4 supplies the wrap sheet 416 to one side of the open fiber tow 41 lb.
- the wrap sheet supply mechanism 4 includes a feeding means for the wrap sheet 416 and a guide roll (not shown) for guiding the unwrapped lap sheet 416 to the vacuum conveyor 32.
- a rolled roll 441 and a drive device (not shown) for driving the roll 441 are provided.
- the absorbent polymer supply mechanism 6 sprays the absorbent polymer 414 from the polymer supply port arranged on the upper surface side of the fiber opening tow 41 lb (the side opposite to the wrap sheet 416 side).
- a vacuum box 321 is positioned on the opposite side of the polymer supply port across the endless belt 320, and the absorbent polymer 414 is sucked from the back side of the opened tow 411b by the vacuum box 321. Spraying can also be performed.
- the width of the polymer supply port in the direction perpendicular to the conveying direction (longitudinal direction) of the opening tow 411b is narrower than the width of 41 lb of the opening tow 41b.
- the polymer 414 is sprayed only in the region.
- the folding mechanism 7 includes folding guides 71 on both sides in the flow direction.
- the wrap sheet 416 is pulled by a pair of rolls 480 and 481 constituting the long fiber cutting mechanism 408 and continuously conveyed, and extends outward from both side edges of the opening tow 41 lb of the wrap sheet 416.
- the protruding portions 416a and 416a are folded back by the guide 71 to the upper surface side of the opening tow 41 lb.
- the upper surface side of the opened tow 41 lb is also covered with the wrap sheet 416, and as a result, the upper and lower surfaces of the opened tow 41 lb are covered with the wrap sheet 416.
- a cutting mechanism 5 for the absorber continuum 100 is provided downstream of the folding mechanism 7.
- the cutting mechanism 5 of the absorbent body continuum 100 includes a cutter roll 51 having a cutting blade 51a extending in the axial direction and an anvil roll 52, and the absorbent body continuum 100 is incorporated into each absorbent article. Cut to length of absorber.
- a continuous filament tow 41 la having crimps is continuously drawn and opened by the opening mechanism 2. Widening and pretensioning roll of tow 411a by compressed air of textile machine 21-23 The tow 41 la is opened by stretching the tow 41 la due to the difference in peripheral speed between 5 and bloominda roll 26. Then, 41 lb of the resulting spread tow is supplied via a feed roll 31 onto a wrap sheet 416 supplied onto a vacuum conveyor 32.
- the above-described fiber cutting mechanism 8 cuts continuous filaments and forms short fibers.
- the continuous filament is cut at least in a range where the absorbent polymer 414 is dispersed, and further, in a portion pressed between the meshing portions of the rolls 480 and 481 and pressed.
- This continuous filament cut is caused by pressing against the edge of the continuous filament F force gear, thereby forming short fibers 412.
- the orientation direction of the short fibers 412 generated by cutting the continuous filament F is hardly changed from the orientation direction of the continuous filament F before cutting, and the orientation direction of the continuous filament F before cutting is maintained.
- the long fiber 411 in which the continuous filament F is held without being cut, the short fiber 412 generated by cutting the continuous filament F, and a powerful web 413 are formed from the open tow 41 lb. Is done.
- the absorbent polymer 414 is sprayed to the opened tow 411b by the absorbent polymer supply mechanism 6.
- Absorbent polymer 414 is sprayed only in the region of the predetermined width in the center of the width direction of the open tow 41 lb.
- Absorbent polymer 414 is continuously sprayed in the longitudinal direction of 41 lb of open tow.
- the application amount of the absorbent polymer 414 is preferably equal to or more than the basis weight of 41 lb of the spread tow, more preferably 2 times or more, and further preferably 3 times or more. For example, if the basis weight of an open tow 41 lb is 30 gZm 2 , the application rate of the absorbent polymer 414 should be 30-400 g / m 2 , especially 60-300 g / m 2 .
- the wrap sheet 416 is formed in a state in which the opened tow 41 lb obtained by opening the tow 41 la is contracted from the maximum stretched state when the tow 41 la is opened. Laminated on top. More specifically, the peripheral speed V2 of the bloomer roll 26 is made faster than the peripheral speed VI of the pretensioning roll 25 to open the tow 41 la, while the peripheral speed V2 of the bloomer roll 26 is Decreasing the conveying speed V4 of the wrap sheet 14 (same as the conveying speed of the endless belt 3 20 of the vacuum conveyor 32), thereby reducing the opening tow on the vacuum conveyor 32. 41 lbs of tension is released to develop crimpability.
- the preferable crimp rate of the above-mentioned long fibers 411 and short fibers 412 can be efficiently expressed.
- the maximum stretched state when opening the tow 41 la is the stretched state between the pretensioning roll 25 and the blooming roll 26.
- a wrap sheet 416 having a width sufficient to cover both upper and lower surfaces of the opened tow 41 lb is used.
- the wrap sheet 416 includes portions 416a and 416a extending from both side edges of the opened tow 41 lb after the absorbent polymer 414 is supplied to the opened tow 41 lb. Is folded back to the upper surface side of the open tow 41 lb, and the upper surface side is also covered with the wrap sheet 416.
- the absorber continuum 100 is cut into a desired size according to the type and size of the absorbent article into which the absorbent continuum 100 is cut by the absorber continuum cutting mechanism 5, and the absorber 10H and Is done. According to this manufacturing method, the absorber 10H having the above-described form can be efficiently and continuously produced in this manner.
- Another method for controlling the orientation of the short fibers includes the following method.
- the force of cutting the continuous filament F with a compression roll while maintaining the web orientation in the process of controlling the tension of 41 lb of the spread tow was produced from the short fiber 412 instead.
- the same effect can be obtained by dispersing the absorbent polymer 414 on a web with controlled orientation.
- a web with a controlled degree of orientation is first prepared. That is, first, a short fiber cut in advance is passed through a card machine that is usually used, and a heat treatment is performed after a web is produced.
- the web in this state has an orientation degree of less than 1.2. Therefore, by applying a heat embossing process in a state where tension is further applied to the web (for example, the web can be sandwiched between two rolls and the web can be stretched in the length direction using the rotation speed ratio of the rolls).
- a web with more oriented fibers is obtained.
- the stretching ratio is adjusted by appropriately adjusting the processing conditions so that the degree of orientation is 1.2 or more.
- the short fiber web can be stretched in the transverse direction.
- FIGS. 34 (a) to 34 (e) schematically show an absorbent body according to another embodiment of the third invention.
- the area RA force with the diagonal line of the lower right slanted line is the area where the absorbent polymer is sprayed (the same as the area where the absorbent polymer is distributed), and the area RB force with the slanted line of the lower left dotted line is RB force
- RB force This is the range in which the short fiber 412 derived from the continuous filament F was produced by pressure-compressing the opened tow 4 l ib.
- the range RA where the absorbent polymer is distributed includes the range RB where the short fibers oriented in the longitudinal direction of the absorber are distributed. Specifically, in both the longitudinal direction and the width direction of the absorbent body, the range RB where the short fibers are distributed is narrower than the range RA where the absorbent polymer is distributed.
- the absorbent body shown in FIG. 34 (a) is the above-described roll manufacturing method of the absorbent body as the roll 480 described above. ), And the width in the direction perpendicular to the opening tow 411b of the cut portion is smaller than the width in the same direction of the polymer supply port. . In this case, the continuous filament at the portion compressed and compressed between the rolls 480 and 481 is cut.
- the absorber shown in Fig. 34 (b) also includes the range RB in which short fibers oriented in the longitudinal direction of the absorber are distributed in the range RA in which the absorbent polymer is distributed. Specifically, in the width direction of the absorber, the range in which short fibers are distributed than the range RA in which the absorbent polymer is distributed. In the longitudinal direction of the absorber in which the width of RB is narrow, the absorbent polymer is distributed. The range RA and the range where short fibers are distributed RB have the same length.
- the absorber shown in FIG. 34 (b) is the same as that of the polymer supply port in the manufacturing method of the absorber described above in the direction perpendicular to the 41 lb. It can be manufactured by using a tool that is narrower than the width in the direction.
- the range RA in which the absorbent polymer is distributed coincides with the range RB in which short fibers oriented in the longitudinal direction of the absorber are distributed.
- the absorbent body shown in FIG. 34 (c) is obtained by intermittently spraying the absorbent polymer in the above-described manufacturing method of the absorbent body, and the cut portion and the non-engagement portion in which the rolls 480 and 481 are swallowed together
- a non-cutting portion or a non-cutting portion made of a concave portion is formed alternately, and the width of the cut portion in the direction perpendicular to the opening web 41 lb is the same as the width in the same direction of the polymer supply port. , Can be manufactured.
- the range RB in which short fibers are generated is narrower than the range RA in which the absorbent polymer is distributed.
- the absorber shown in FIG. 34 (d) and FIG. 34 (e) is the above-described absorber manufacturing method, in which the rolls 80 and 81 are squeezed together and a non-cut part made up of a non-pinch part. Alternatively, it is produced by using a roll in which non-cut portions which are concave portions are alternately formed and the width in the direction perpendicular to the open web 41 lb of the cut portion is the same as the width in the same direction of the polymer supply port. be able to.
- the absorbent polymer is dispersed on the entire surface of the web, and in FIG. 34 (d) and FIG. 34 (e), the long fibers are present in regions other than those indicated by the range RB.
- the absorbent body of the present invention has long fibers at the front and rear ends in the longitudinal direction of the absorbent body, such as the absorbent bodies shown in Figs. 34 (a), 34 (c), and 34 (d). On the other hand, it may have a portion having 411 and a portion where the short fiber 412 exists between them. In that case, like the absorbent body shown in FIGS. 34 (a), 34 (c), and 34 (d), the left and right sides of the absorbent body also have portions made of long fibers 411. It is preferable that the portion made of the fiber 411 surrounds the range where the short fiber 412 exists, but does not have the portion made of the long fiber 411 on the left and right sides of the absorbent body. Also good.
- the range RB in which the short fibers 412 oriented in the longitudinal direction are present exhibits excellent spot absorptivity.
- the liquid excretion part force (urine and menstrual blood) by being used in absorbent articles such as disposable diapers and sanitary napkins so as to be located at the part facing the liquid excretion part of the wearer Etc.) is absorbed smoothly from a narrow range of the absorbent body 10, and is stably held by the absorbent polymer present in that portion.
- the absorbent body when a large amount of liquid is supplied or a large amount of liquid is absorbed by the absorbent body, when the liquid reaches both sides in the longitudinal direction of the absorbent body, the long fibers oriented in the longitudinal direction of the absorbent body As a result, the liquid diffuses well in the longitudinal direction of the absorbent body (front and rear direction of the wearer), and the wide range of the absorbent body is effectively used, while the diffusion of the absorbent body in the width direction is suppressed.
- the absorbent body 101 shown in Fig. 35 has a two-layer structure in which an upper web 91 mainly composed of short fibers and a lower web 92 mainly composed of long fibers are laminated. It becomes power with the absorptive core 9 and the wrap sheet (not shown) covering the absorbent core 9.
- the wrap sheet covers the upper and lower surfaces and both longitudinal sides of the absorbent core 9 in the same manner as the absorbent body 10H shown in FIGS.
- the short fibers in the absorbent body 101 are unevenly distributed in the upper web 91 disposed on the wearer's skin side when incorporated in the absorbent article.
- the long fibers are unevenly distributed in the lower web 92 disposed on the opposite side of the wearer's skin when incorporated in the absorbent article. That is, the long fibers and the short fibers are unevenly distributed in different parts in the thickness direction of the absorbent body 101.
- the short fibers are oriented in the longitudinal direction of the absorbent body in the plane of the absorbent body 101.
- the long fibers are also oriented in the longitudinal direction of the absorbent body in the plane of the absorbent body 101.
- the proportion of short fibers in the constituent fibers is preferably 50 to: L00% on a weight basis, more preferably 60 to 100%, still more preferably 80 to 100%. is there.
- the proportion of long fibers in the constituent fibers is preferably 50 to 100%, more preferably 60 to 100%, more preferably 80 to 100%, based on weight. .
- Absorbent body 101 contains absorbent polymer particles (not shown) as particles.
- the absorbent polymer particles may be contained in the entire upper web 91 and the entire lower web 92. Alternatively, it may be included only in the upper web 91 or only in the lower web 92. That is, the absorbent polymer particles may be unevenly distributed at a specific site in the thickness direction of the absorbent body 101.
- the upper web 91 including short fibers exhibits excellent spot absorbability, and therefore the upper web 91 is positioned at a portion facing the liquid excretion portion of the wearer.
- liquid excretion part force excreted liquid urine, menstrual blood, etc.
- the absorbent body absorbs liquid into the absorber smoothly in a narrow range force.
- the liquid is disposed on both sides in the longitudinal direction of the absorbent body or on the non-skin contact surface side of the upper web 91.
- the long fibers oriented in the longitudinal direction of the absorbent effectively diffuse the liquid in the longitudinal direction of the absorbent body (front and back direction of the wearer), so that a wide range of the absorbent body is effectively used. Used. On the other hand, the diffusion in the width direction of the absorber is suppressed, and excellent lateral leakage prevention performance is obtained.
- the width of the upper web 91 is lower. The force that is narrower than the width of the web 92
- the width of the upper web 91 can be made substantially the same as the width of the lower web 92. Alternatively, the width of the upper web 91 can be made wider than the width of the lower web 92.
- the absorber 101 shown in FIG. 35 can be manufactured according to the manufacturing method of the absorber shown in FIG. 30 and FIG.
- the manufacturing apparatus shown in FIG. 33 is used, and a continuous gear constituting a spread tow is formed by a bite gear.
- the filament is cut across the entire width of the open tow to produce short fibers.
- the absorbent polymer is spread over the entire width of the web that has short fiber strength.
- the upper web 91 is obtained.
- a tow made of continuous filaments is opened to form a spread web.
- the lower web 92 is obtained.
- the intended absorbent body 101 is obtained.
- FIG. 36 is a view showing a state in which an absorbent body 104 according to still another embodiment of the third invention is incorporated into a disposable diaper 101 using a pant-type as an absorbent article.
- the use and disposal diaper 101A is not particularly described in the same way as the disposable diaper 101 described above, and the description of the diaper 101 is appropriately applied including its preferable configuration.
- the schematic cross-sectional view showing the cross section taken along the line I-I of the diaper shown in FIG. 36 is the same as FIG. 9, and the schematic cross-sectional view showing the cross section of the diaper shown in FIG. Is the same.
- the second absorbent core 142 is composed of the absorbent core 415 in the absorbent body 10H shown in FIG. 30 and FIG. That is, the second absorbent core 142 includes long fibers and short fibers oriented in the longitudinal direction of the absorbent body 104, and further includes an absorbent polymer.
- the second absorbent core 142 has a rectangular shape in plan view, and has a length over the substantially entire length of the absorbent main body 105 including the absorbent body 104 and a width slightly narrower than the width of the absorbent main body 105.
- the first absorbent core 141 also has a long fiber force oriented in the longitudinal direction of the absorbent body 104.
- the first absorbent core 141 may or may not contain an absorbent polymer.
- the absorber 104 in the present embodiment as a whole is a vertically long rectangular shape in the diaper front-rear direction. It has a planar view shape.
- the absorbent body 104 is fixed between the top sheet 102 and the back sheet 103 in a state where the absorbent body 104 is entirely covered with a water-permeable wrap sheet (not shown) made of tissue paper or a water-permeable nonwoven fabric. ing.
- a water-permeable wrap sheet (not shown) made of tissue paper or a water-permeable nonwoven fabric.
- Each of the first absorbent core 141 and the second absorbent core 142 may be covered with a wrap sheet.
- the first absorbent core 141 and the second absorbent core 142 may be partially bonded with an adhesive or the like, or may not be bonded.
- the first absorbent core 141 overlaps with the portion located between the left and right missing portions 144, 144 (the portion that also has the central piece 141M force), and the side piece 141S. , 141S contains short fibers.
- long fibers are included in the portions overlapping the left and right missing portions 144 and 144. Even when such a configuration is adopted, the same effect as the diaper can be exhibited.
- the surface sheet 102 has portions extending from both side edges of the absorbent body 104, which are wound around the non-skin contact surface of the absorbent body 104, and On the non-skin contact surface side, the back sheet 103 is fixed with an adhesive (not shown).
- the side leakage prevention performance can be drastically improved, so that the leakage prevention performance is improved or reduced while suppressing the width of the absorbent main body.
- the width of the crotch can be narrowed to improve the fit.
- the leak-proof cuff 106 in the crotch C can stand up to the wearer's skin and secure a sufficient height, and even if it is crushed, it has a substantial liquid-absorbing surface. Combined with the fact that it is difficult to narrow down, it is played more reliably.
- the fibers contained in the second absorbent core are short fibers, both sides of the absorber where the fibers are attracted to each other are more likely to stand up than in the case of continuous fibers, and a spot is formed at the center of the absorber. Since the absorbability can be imparted, the anti-moisture resistance will be improved more so. For this reason, it is preferable that the short fibers contained in the second absorbent core and the particles to be dispersed to generate the short fibers are present in a biased manner in the center in the width direction.
- the third invention has been described based on the preferred embodiments, the third invention is not limited to the above embodiments.
- the long fiber and the short fiber are Forces that are unevenly distributed in different parts in the planar direction or thickness direction of the absorbent body
- short fibers and long fibers may be mixed in a single web!
- the force in which the orientation direction of the long fibers and the short fibers coincides with the longitudinal direction of the absorbent body is not limited to this.
- the orientation direction of a long fiber and a short fiber is not limited to this.
- the orientation direction of a long fiber and a short fiber can be set to a direction orthogonal to the longitudinal direction of the absorbent body.
- the orientation directions of the long fibers and the short fibers are the same.
- the orientation directions of these fibers may be different.
- the orientation direction of the short fibers may be a direction that coincides with the longitudinal direction of the absorber
- the orientation direction of the long fibers may be a direction that is orthogonal to the longitudinal direction of the absorber.
- the orientation direction of the long fibers may be the direction that coincides with the longitudinal direction of the absorbent body
- the orientation direction of the short fibers may be the direction that is orthogonal to the longitudinal direction of the absorbent body.
- the absorbent article of the present invention may include the above-described other absorbers in place of the above-described absorber 104. Further, instead of a pants-type disposable diaper, an unfolded disposable diaper may be used. Further, the absorbent body of the present invention may be disposed between an absorbent body having a general configuration in a conventional disposable diaper or the like and a surface sheet, and used as a so-called sublayer or second sheet.
- the absorbent article of the present invention comprising the absorbent body of each of the above embodiments may have two or more pairs of opposing pairs of solid gathers. Examples of such an absorbent article, effects thereof, and a preferable configuration in that case are as described above with reference to FIG. 10 or FIG.
- an absorbent body 10J includes a fiber assembly 12 including short fibers 122 bonded to each other and including long fibers 121, and the fiber assembly 1 2. It consists of an absorbent core 11 composed of massive absorbent polymer 13 (lumped particles) contained therein, and a wrap sheet 14 covering the absorbent core 11.
- the fiber assembly 12 may be a non-woven fabric. By using non-woven fabric, the entire fiber assembly can be given strength. Can greatly change the structure of the absorber by adding a folding process.
- the product and the absorbent body are likely to be distorted by the activities of the wearer. Also, depending on the activity, the absorber may be destroyed, resulting in a part where the amount of absorption is extremely reduced. Absorption of the absorber often occurs around the crotch where excrement tends to accumulate and external force S is likely to be applied to the absorber, and this phenomenon may cause leakage.
- the absorbent body 10J of the present embodiment it is necessary to reduce the shortage as in the absorbent body 10J of the present embodiment and the absorbent body 10B′ ⁇ : LOF ′ described later. It is preferable to form a state in which the fibers are bonded to each other. More preferably, it is preferable that the combined short fiber is present at a portion disposed opposite to the excretion part of the wearer when worn.
- the short fibers can be bonded by, for example, hot embossing, ultrasonic embossing, high-frequency embossing, or the like.
- hot embossing, ultrasonic embossing or high frequency embossing the short fiber is heat-sealed. It can also be used in combination with various binders such as hot melt, low melting thermoplastic resin, acrylic emulsion, and acetic acid emulsion emulsion, and water-soluble binders such as carboxymethylcellulose sodium salt and polybutanol.
- the multiple joints 15 are formed in a state of being dispersed in the planar direction, and are separated from each other in the longitudinal direction and the width direction of the absorber 10. More specifically, a plurality of joints 15 are arranged in series at equal intervals in the longitudinal direction of the absorbent body 10, and a row of joints having a plurality of joint forces in series in the longitudinal direction is arranged in the lateral direction. A plurality of rows are formed at regular intervals. Adjacent rows and rows are offset by half the pitch of the joints, and the joints 15 are staggered as a whole.
- the fiber assembly 12 is pressurized and heated in the thickness direction, and a plurality of short fibers 122 are heat-sealed.
- the joint 15 may be scanned when a regular pattern such as a dot or line is used. From the viewpoint of maintaining pot absorbability and improving strength, the area per one is preferably 0.1 to 1.2 cm 2 , more preferably 0.07 to 0.8 cm 2 . In addition, the number of joints 15 per 2 cm 2 is preferably 1 to 9, more preferably 1 to 4. The joint 15 may use patterns that take into account design, such as animal patterns and floral patterns!
- the area of the joint 15 does not need to be evenly distributed over the entire surface of the absorbent article, and can be changed according to the absorption performance and other purposes when adding design with emphasis on design. is there.
- the long fibers 121 and the short fibers 122 are unevenly distributed in different parts in the planar direction of the absorbent body.
- the short fibers 122 are unevenly distributed in a region M (hereinafter also referred to as the center region M) having a predetermined width in the center in the width direction of the absorbent body 10J.
- the short fibers 122 are distributed substantially uniformly in the central region M, but are not substantially present in the side regions S and S on both outer sides of the central region M.
- the long fibers 121 are unevenly distributed in the side regions S and S and distributed substantially uniformly in the side regions S and S, while the central region M has the side regions S and S. Only a small amount of long fibers are present.
- the absorbent body 10J of the present embodiment in addition to the fibers that have become short fibers, those that maintain the form of long fibers remain in the central region M. Is a mixture of long and short fibers. When long fibers and short fibers are mixed, a short fiber layer and a long fiber layer are laminated to form a short fiber layer. Do not include the extent that the part goes into the layer that also has long fiber strength.
- the state in which the long fibers and the short fibers are mixed is preferably a state in which a part of the length direction of the short fibers is entangled with the long fibers.
- the joint 15 in the present embodiment is formed only in the central region M of the absorbent body 10J, but the same processing is applied to the side regions S and S, and the joint in which the long fibers are heat-sealed to each other is formed. It may be formed.
- the side regions S and S may be subjected to hot embossing to form a joint with the same pattern as the central region M in the side regions S and S.
- a method for further improving the spot absorbability of the liquid, and also improving the web shape retention One or more sheets of sheet material such as paper non-woven fabric are superposed on the web and on the side and / or on the side of the web. Examples thereof include a method of joining the cover, the web and the sheet material with an adhesive applied to the sheet, or a method of heat-sealing. According to this method, a sheet-like absorbent body in which a web is sandwiched and fixed between a pair of sheet materials can be obtained. Such a sheet-like absorber has a high rigidity due to the bonding with the sheet material and the rigidity of the sheet material itself, thereby improving the handling property, and can be easily transported by itself. it can. Moreover, since this sheet-like absorbent body can be easily cut or cut into a desired shape, an absorbent body corresponding to the shape of the absorbent article can be easily produced.
- sheet-like absorbent body can be easily cut or cut into a desired shape, an absorbent body corresponding to the shape of the absorbent article
- the adhesive should be applied so as not to impair the water permeability, softness and air permeability of the web.
- the fiber can be joined at many joining points without impairing the properties of the web.
- UFD fiber trademark
- a hydrophilic adhesive or a hydrophobic adhesive can be used with no particular limitation on the type of adhesive.
- Particularly preferred are hydrophilic adhesives. Examples of the hydrophilic adhesive include cycloflex (registered trademark of National 'Starch and Chemical Co., Delaware, USA) which is a hydrophilic hot melt pressure-sensitive adhesive.
- the adhesion between the sheet material and the web mainly includes the case where the surfaces adhere to each other. Some of the adhesives also penetrate into the web and bond the fibers inside the web in the thickness direction.
- the soot amount is preferably 15 to 200 g / m 2 , more preferably 20 to 150 g / m 2 , and particularly preferably 25 to 120 gZm 2 .
- the basis weight is 15 ⁇ : LOOgZm 2 , especially 20-80gZm 2 , especially It is preferable to be 25 to 50 g / m 2 .
- the absorber On the other hand, if you want to improve the cushioning properties of the absorber, if you want to make the absorber less likely to squeeze, if you want to give the absorber a compression recovery property, or if you want to suppress the transpiration of water vapor from the absorber, increase the amount.
- the central region M where the short fibers are generated is positioned at the portion P facing the wearer's liquid excretion portion.
- the fluid excreted from the fluid excretion part urine, menstrual blood, etc.
- the absorbent polymer 13 unevenly distributed at the site, and is stably held in the absorber 10J.
- the liquid diffuses to the side areas S and S There is power S.
- the long fibers exist in each of the side regions S and S while maintaining their form, and they are oriented in the longitudinal direction of the absorber, the liquid reaching the side regions S and S is absorbed. It diffuses well in the longitudinal direction of the body 10J (front and back direction of the wearer), and diffusion in the direction across the side regions S, S is suppressed. As a result, leakage of liquid from both side edges of the absorber 10J is effectively prevented, and a wide range of the absorber is effectively utilized.
- the absorbent body 10J has the joint portion 15 in which the short fibers 122 are joined to each other, even in the central region M where the short fibers 122 are unevenly distributed, the fiber assembly 12, and thus the absorbent body. 10J is superior in strength, and it is difficult for leak-proofing and slippage. That is, even if a force such as compression or bending is applied to the absorbent body 10J due to the movement of the wearer, the short fibers 122 are bonded to each other by the joint 15. Since the force is dispersed through the fiber assembly 12, and the absorbent body 10J is not easily broken or biased, the bulky absorbent polymer 13 contained in the fiber assembly 12 is not easily biased. Leakage deterioration is less likely to occur.
- the short fibers and the long fibers are also heat-sealed at the joint portion 15, the force applied to the absorbent body 10J is dispersed over a wider range, and the above effect can be further expected.
- the joint 15 forms a concave shape on the surface of the absorber 10J, the liquid can easily flow and spot absorption is improved.
- the absorbent polymer 13 and the short fibers 12 2 derived from long fibers in the absorbent body 10J of the present embodiment are both present in the central region M of the absorbent body 10J, and the absorbent polymer (particles) 13 Is the same as the range where the short fibers 122 are generated.
- the width of the range in which the short fibers 13 are generated in the width direction of the absorbent body 10 is the width (side region) in the range where there is substantially no short fiber that is preferably 20 to 95%, especially 50 to 85% of the total width W of absorber 10J (see Fig. 37).
- the width of S) W2 is preferably 5 to 80%, particularly 15 to 50% of the total width W of the absorber 10J.
- FIGS. 39 to 43 are views showing an absorbent body according to still another embodiment of the present invention.
- Each absorber 10B′ ⁇ : LOF ′ shown in FIGS. 39 to 43 includes a short fiber in a hatched portion in each figure.
- the absorbent body 10B 'shown in Figs. 39 (a) and 39 (b) includes an upper fiber layer 91 mainly composed of short fibers, and a lower fiber layer 92 mainly composed of long fibers. And a lap sheet (not shown) that covers the absorbent core 9.
- the wrap sheet covers the upper and lower surfaces of the absorbent core 9 and both sides in the longitudinal direction, similarly to the absorbent body 10 shown in FIGS.
- the short fibers in the absorbent body 10B ′ are unevenly distributed in the upper fiber layer 91 disposed on the skin side of the wearer when incorporated in the absorbent article, and the long fibers are worn by the wearer when incorporated in the absorbent article. It is unevenly distributed in the lower fiber layer 92 disposed on the opposite side to the skin side. That is, long fiber And the short fiber is unevenly distributed in the different site
- the upper fiber layer 91 is formed with a joint portion 15 by heat embossing, and in each joint portion 15, short fibers are thermally fused.
- the upper fiber layer 91 containing short fibers exhibits excellent spot absorbability, so that the upper fiber layer 91 is located at a position facing the liquid excretion part of the wearer.
- the liquid excreted from the liquid excretion part urine, menstrual blood, etc.
- the absorber can be absorbed into the absorber smoothly from a narrow range.
- the liquid is disposed on both sides in the longitudinal direction of the absorber or on the non-skin contact surface side of the upper fiber layer 91.
- the long fibers oriented in the longitudinal direction of the absorber allow the liquid to diffuse well in the longitudinal direction of the absorber (front and back direction of the wearer), and the wide range of the absorber is effectively used. On the other hand, diffusion in the width direction of the absorber is suppressed, and an excellent side leakage prevention performance can be obtained.
- the width of the upper fiber layer 91 is narrower than the width of the lower fiber layer 92, but the width of the upper fiber layer 91 may be substantially the same as the width of the lower fiber layer 92. . Further, although the length of the upper fiber layer 91 in the longitudinal direction is the same as the length of the lower fiber layer 92, the length of the upper fiber layer 91 can be made shorter than the length of the lower fiber layer 92.
- Each of the absorbent bodies 10C ′ to LOF ′ shown in FIGS. 40 to 43 includes an absorbent core 9 composed of a single-layer fiber assembly 93 and a wrap sheet (not shown) covering the absorbent core 9. ) And power.
- the wrap sheet covers the upper and lower surfaces of the absorbent core 9.
- the wrap sheet preferably covers the upper and lower surfaces of the portion 9S where at least the short fibers of the absorbent core 9 are unevenly distributed.
- the absorbent body 10C′ ⁇ : LOF ′ short fibers are unevenly distributed in the hatched portions in each figure, and long fibers are unevenly distributed in the portions not hatched. That is, the long fibers and the short fibers are unevenly distributed at different portions in the planar direction of each absorber.
- each of the absorbent bodies 10 C ′ to LOF ′ the fiber assembly 93 sandwiched between the wrap sheets is subjected to heat embossing to form joints 15 and 15A in which the fibers are joined to each other. Yes.
- the junctions 15 and 15A are distributed and arranged over substantially the entire area of each absorber. And in the junction part 15 located in the part which attached the oblique line, the short fibers are heat-seal
- the absorbent body 10C 'shown in Figs. 40 (a) and 40 (b) has a portion 9S in which short fibers are unevenly distributed on one end side in the longitudinal direction of the absorbent core 9 made of the fiber assembly 93.
- the other end side in the longitudinal direction has a portion 9L in which long fibers are unevenly distributed.
- the absorbent body 10D 'shown in Figs. 41 (a) and 41 (b) is a horseshoe-shaped portion 9S in which short fibers are unevenly distributed on one end side in the longitudinal direction of the absorbent core 9 made of the fiber assembly 93. And has a portion 9L in which long fibers are unevenly distributed on the other end side in the longitudinal direction.
- the absorbent polymer is unevenly distributed on the side of the portion 9L in the longitudinal direction.
- This absorbent body 10D ' has an excellent spot absorbability on the abdominal side by incorporating the portion 9L side in the longitudinal direction into the diaper facing the back side (back side) of the wearer, and at bedtime. Even if a large amount of urine is urinating in the back, the urine is effectively diffused and retained in many absorbent polymers, so that leakage can be effectively prevented.
- the front side of the absorber preferentially swells to form a step, thereby playing a role of a weir that prevents back excrement (for example, feces) from flowing to the front side of the body.
- Absorbent body 10E 'shown in Fig. 42 (a) and Fig. 42 (b) has a portion 9S in which short fibers are unevenly distributed at the center in the width direction of absorbent core 9 made of fiber assembly 93, On both sides of the portion 9S, there are portions 9L in which long fibers are unevenly distributed.
- the absorber 10E ' According to the absorber 10E ', the same effect as the absorber 10J shown in Fig. 37 and Fig. 38 described above is exhibited.
- the both side portions of the diaper stand toward the wearer's skin side by elastic members disposed at or near both sides thereof. It is possible to easily form a side leakage prevention wall that can be easily raised.
- the elastic member for raising both side portions of the absorbent body 10E ′ is the non-contact surface side of the absorbent body 10E ′. Examples include the skin contact surface side, the vicinity of the side edge of the absorber 10E ′, the inside of the absorber 10E ′, and the like.
- the portion 9S where the short fibers are present is dispersed and arranged in the absorbent core 9 made of the fiber assembly 93. . Due to the presence of multiple parts containing short fibers in a random or regular pattern, the parts containing short fibers quickly absorb and swell, resulting in the formation of bulges that result from the swelling, Good ventilation between the skin and the diaper is maintained. Furthermore, since the contact area between the skin and the diaper decreases, the burden on the skin such as rubbing is reduced.
- the short fibers in the absorber 10B 'to LOF' are preferably synthetic or semi-synthetic fibers.
- the use of short fibers that are not pulp fibers, which have been widely used in the past, has become difficult for the fibers themselves to absorb water, so the bulkiness of the absorbent body is maintained and the absorbent body is absorbable.
- An environment in which the polymer swells and remains in a stable state can be maintained.
- Synthetic fibers that can be used as short fibers include polyolefins such as polyethylene 'polypropylene, polyesters typified by polyethylene terephthalate, polyacrylonitrile typified by acrylics, polyamides typified by nylon, and polybulls typified by vinylon. Examples include alcohol and polyurethane.
- semi-synthetic fibers that can be used as short fibers include rayon, cuvula, and acetate.
- Synthetic and semi-synthetic fibers can be used alone or in combination of two or more, respectively.
- the expression synthetic or semi-synthetic fiber also includes the combined use of synthetic fiber and semi-synthetic fiber.
- the staple fiber in the present invention may be a pulp fiber.
- the short fiber is a pulp fiber
- a pulp fiber having a low beating degree can be used, and a joined portion where the pulp fibers are bonded to each other can be formed by pressure embossing, hydroentanglement, or a chemical reaction.
- Absorbent body 10B'-: LOF ' is produced by cutting the long fibers into massive particles and cutting them.
- the upper fiber layer 91 in the absorbent body 10B ′ shown in FIG. 39 (a) and FIG. 39 (b) is a card web produced using a card machine, a garnet web produced using a garnet machine, It is also possible to construct an airlaid web isotonic force that is laminated by flying.
- the fibers constituting the card web are already short fibers at the raw cotton stage to be supplied to the card machine.
- the lower fiber layer 92 in the absorbent body 10B ′ can also constitute a web force obtained by weaving the tow in the same manner as the above-described absorbent body manufacturing method. It is also possible to construct a web force obtained by a spunbond method in which melted resin is directly spun. The web may be crimped by a hydrophilization treatment or a secondary cage.
- Fig. 44 (a) is a diagram illustrating an example of a method of manufacturing the absorber 10B '.
- the short fibers 122A weighed by the hopper 94 are supplied to the card machine 95 to obtain a strip-shaped card web 91A.
- the web 91A is connected to the embossing roll 50 and the anvil roll. It is introduced between 51 and heat embossed to form the joint 15 where the short fibers 122A and 122A are joined together.
- the laminate is passed between a pair of rollers 96 and 96 and pressed in the thickness direction.
- the pressurization with the pair of rollers 96, 96 is performed under the condition that the thickness of the laminate is reduced and the shape retention is improved, but the long fibers are not substantially cut.
- the lap sheet was supplied by a wrap sheet supply mechanism (not shown) to cover the laminate, and then cut into lengths of one absorbent body as described above. A large number of absorbers 10B 'can be obtained continuously.
- the absorbent polymer 13 is supplied so as to be sandwiched between the card web 91A and the long fiber web 12, and the obtained absorbent body 10B 'is supplied.
- the absorbent polymer is unevenly distributed in the vicinity of the boundary between the upper absorbent layer 91 and the lower absorbent layer 92 in the thickness direction of the absorbent body.
- FIG. 44 (b) is a diagram showing an example of a method for producing the absorber 10C′ ⁇ : L0F ′.
- the long fiber web 12 obtained by opening the tow is continuously conveyed, and the web 12 is stacked on the stretchable sheet 14a.
- Spread non-absorbable absorbent polymer 13 on top is passed between a pair of rollers 97 and 97, and the absorbent polymer 13 is pushed into the web 12.
- the long fibers in the web 12 are partially cut through a long fiber cutting device 98.
- the web 12 is introduced between the embossing roll 50 and the anvil roll 52 and subjected to hot embossing to form a joint 15 in which short fibers are joined together. And it cut
- the long fiber cutting device 98 is capable of cutting long fibers regardless of the presence or absence of massive particles.
- the long fiber cutting device 98 includes a pressurizing section having cutting protrusions on the peripheral surface or surface thereof.
- the pressing part is pressed against the web 12 in a state of being sandwiched between the sheets 14a and 14b, it is possible to use one configured to cut the long fibers in the part pressed by the cutting projection.
- the elongating sheets 14a and 14b do not easily perforate the sheet even when pressed with the cutting protrusions.
- FIG. 45 shows an example of the arrangement of the cutting protrusions of the cutting device 98 when manufacturing the absorbent body 10E ′ shown in FIG. 42, and is formed on the peripheral surface of the pressure roll (the surface of the pressure unit). The arrangement of the cut projections is shown with the roll unfolded. As shown in FIG. 45, cutting protrusions are formed in a staggered arrangement in the portion 98M corresponding to the center portion in the width direction of the web 12, and by pressing the web 12 with the portion 98M, the center of the web 12 is formed. A large number of short fibers can be produced in the region.
- the projections for cutting are not formed on the portions 98S, 98S corresponding to the both side portions of the web 12, and short fibers are not substantially generated in the left and right side regions of the web 12.
- the absorbers IOC ′, 10D ′, and 10F ′ can be manufactured in the same manner except that the arrangement of the cutting protrusions formed on the surface of the pressurizing portion is changed.
- the dispersion pattern of massive particles capable of cutting long fibers is changed, and the range of the hatched portion in each figure of the absorbent body shown in FIGS. And an absorbent body in which short fibers derived from long fibers are produced.
- Fig. 46 is a diagram showing a method of manufacturing an absorbent body according to still another embodiment of the present invention.
- a long fiber web 12 obtained by opening a tow is supplied to a long fiber cutting device 99, and the long fiber is partially cut by the cutting device 99 to obtain a long fiber.
- the short fibers and uncut long fibers The web, which is also strong, is stretched by pulling with a pair of rolls 310 and 311. Next, the stretched state of the web is relaxed between the pair of rolls 310, 311 and the vacuum conveyor 32, and the water absorbent polymer 13 is sucked onto the relaxed web while being sucked from the opposite side by the vacuum conveyor 32. Supply.
- a joining portion is formed by a heat embossing device, and then cut to the length of one absorber.
- an absorbent body comprising a fiber assembly including long fibers and short fibers derived from long fibers, in which long fibers and short fibers are mixed can be obtained.
- this absorbent body both short fibers and long fibers are joined at the joint where the short fibers are joined together.
- the entire fiber assembly may be a non-woven fabric or a combination of fibers, not a non-woven fabric and a non-woven fabric.
- Combined force of non-woven fabric mainly composed of short fibers and non-non-woven fabric layer mainly composed of long fibers Absorbability of absorbent polymer, that is, thinner absorbent body, absorbent body strength, liquid diffusion Preferred in terms of sex, etc.
- FIG. 47 shows an example in which a non-woven fabric (upper fiber layer) 91 made of short fibers is laminated on the skin side of a lower fiber layer 92 made of long fibers 121, and the short fibers are made into non-woven fabric by heat fusion and embossed. Processing has been applied. In the portion 15 where the short fibers are embossed, the fibers are consolidated, and the drawability of the liquid is improved.
- FIG. 48 shows an example in which the non-woven fabric (upper fiber layer) 91 in FIG. 47 is arranged in a band shape.
- the absorbent polymer 13 in the lower fiber layer 92 composed of the long fibers 121 is mainly disposed in the portion where the nonwoven fabric 91 is present.
- the lower fiber layer 92 in FIGS. 47 and 48 is made of a fibrous web that is not made into a nonwoven fabric.
- the left-right direction in each figure is a direction orthogonal to the fiber orientation direction (longitudinal direction of the fiber assembly).
- a spot absorptivity is expressed in the short fiber existing portion, and an effect of diffusing the liquid in the long fiber portion can be expected.
- the entire absorbent body can be used efficiently, and the short fiber part can be expected to have the effect of keeping the liquid of the wearer away from the liquid.
- the short fibers may be bonded to each other by bonding the short fibers by other bonding means instead of the heat embossing, ultrasonic embossing, high frequency embossing, and the like.
- the short fibers may be heat-sealed by subjecting a fiber assembly containing short fibers to hot air treatment by an air-through method.
- an air-through hot air treatment machine is arranged instead of the embossing device 5 at the arrangement position of the embossing device 5 in the manufacturing method shown in FIG. It is a matter of heat fusing.
- the absorbent body of the present invention is disposed between a liquid-permeable top sheet and a leak-proof (liquid-permeable! / Tanned water-repellent) back sheet, and absorbs disposable diapers and the like. It is preferably used as an absorbent for articles.
- the absorbent body of the present invention may be disposed between an absorbent body having a general configuration in a conventional disposable diaper or the like and a top sheet, and may be used as a so-called sublayer or second sheet.
- planar shape of the joint formed by embossing can be any shape such as a circle, an ellipse, a square, a rectangle, a triangle, and a star.
- the arrangement of the large number of joint portions 15 is not limited to a staggered pattern, and may be an arrangement as shown in FIG. 49, for example.
- FIG. 49 shows several examples of the shape and arrangement of the joint in plan view.
- the X direction is the orientation direction of the long fibers.
- a crimped acetate long fiber tow was prepared.
- the fiber diameter of this long fiber was 2. ldte X.
- the total fiber content of tow was 250,000 dtex.
- the tow was conveyed under stretching and opened using an air opening device to obtain a spread web.
- a number of disks are predetermined around the axis.
- the web was rolled through a spread web between a roll incorporated at intervals and a smooth receiving roll. After that, the width was adjusted to 100 mm, and the transfer speed was reduced and transferred onto a vacuum conveyor, and the web tension on the vacuum conveyor was released to cause crimps.
- the crimp rate of the fibers in the web was 30%, and the number of crimps per centimeter was 15.
- the space between the long fibers was widened to make it easier for the absorbent polymer to enter, and the web was thickened to improve the embedding supportability of the absorbent polymer.
- An absorbent polymer having a width of 80 mm was spread on the web, and the absorbent polymer was embedded and supported in the spread web.
- the basis weight of the web was 25 gZm 2 and the basis weight of the absorbent polymer was 132 gZm 2 .
- the T-shaped mold had a leg width of 100 mm, a length of 100 mm, a horizontal section width of 125 mm, and a length of 100 mm.
- the basis weights of fluff pulp and absorbent polymer in the pile were 150 g / m 2 respectively.
- the web was layered on the pile, and the whole was wrapped in tissue paper with a basis weight of 16 g / m 2 sprayed with hot melt adhesive. After that, compression between metal rolls and rubber rolls was performed (the clearance between the two rolls was set to Omm), and the web and tissue paper were integrated together, and the web was compressed, and the constituent fibers of the web were absorbed by the absorbent polymer. Was cut to obtain an absorber.
- This web (fiber aggregate or long fiber web) contained a massive absorbent polymer and short fibers, and these were distributed in the form shown in FIG. 6 (d).
- the distribution of short fibers in the absorbent body was unevenly distributed in the central part in the width direction of 80 mm (position where the absorbent polymer was dispersed).
- the abundance of short fibers in the central region in the web width direction was 86% (14% for long fibers), and the abundance of short fibers at both ends in the web width direction was 18%.
- Example 1 Disperse the absorbent polymer on the web in Example 1 intermittently in the longitudinal direction (spread at a width of 80 mm at the center in the width direction from 100 mm to 350 mm from the front in the longitudinal direction) That is, the absorbent polymer was embedded and supported in the spread web in the same manner as in Example 1 except that the spray area was 80 mm wide and 250 mm long.
- fiber stacking the opening was Furaffunorupu on the T-shaped mold to obtain stacks of basis weight lOOgZm 2.
- the T-shaped mold is the same as in Example 1.
- the web was layered on the piled fiber, and the whole was hydrophilized and wrapped with a spunbond meltblown meltblown-spunbond nonwoven fabric (SMMS) having a basis weight of 16 gZm 2 to obtain an absorbent.
- SMMS spunbond meltblown meltblown-spunbond nonwoven fabric
- the absorbent body is compressed between metal rolls and rubber rolls in the same manner as in Example 1, and the constituent fibers of the web are cut with the absorbent polymer as the web is compressed.
- This web (fiber aggregate or long fiber web) contained a massive absorbent polymer and short fibers, and these were distributed in the form shown in FIG. 6 (a).
- the short fibers in the absorber were 78% (22% long fibers) at the position where the absorbent polymer was sprayed and 12% in the non-polymer sprayed area.
- a web P1 in which the same absorbent polymer as that used in Example 1 was embedded and supported was prepared.
- a composite fiber (3.3 dtex, 51 mm cut, fiber surface with a core of polypropylene and a sheath having polyethylene strength) (Surfactant treatment is applied to suppress the generation of static electricity).
- the card was applied to the card so that the basis weight was 30 gZm 2 (P2).
- the obtained synthetic fiber web P2 is inconsistent with the web P1 in which the absorbent polymer is embedded and supported.
- the above-mentioned laminate of P1 and P2 is stacked, and hot melt adhesive is applied by spray coating.
- the distribution of short fibers in the absorber is 100% for the short fibers on the skin side in the thickness direction, and 4% for the short fibers on the back material side in the web thickness direction (those that were cut unintentionally in the processing step). It was thought).
- 100 parts by weight of the opened fluff pulp and 100 parts by weight of the absorbent polymer were uniformly mixed in an air stream to obtain a piled body having a total basis weight of 520 gZm 2 .
- the basis weights of the fluff pulp and the absorbent polymer were 260 g / m 2 , respectively.
- the obtained piled fiber was wrapped with tissue paper having a basis weight of 16 g / m 2 to obtain an absorbent.
- a hot-melt adhesive 5gZm 2 was spray-coated between the laminated fiber and tissue paper, and the two were adhered. Except these, it carried out similarly to Example 1, and obtained the absorber.
- Example 1 an absorbent body was prepared in the same manner as in Example 1 except that it was not compressed by a roll, that is, the fiber was cut.
- the obtained absorbent body is fixed to a 45 ° inclined plate, and a certain amount of physiological saline is repeatedly injected into the position 200 mm from the upper end of the absorbent at regular intervals. The amount of injection until leakage from the part was compared.
- the relative value when the absorption capacity of Comparative Example 1 was 1.0 was calculated using the following formula.
- Absorption capacity (relative value) (absorption capacity of sample) Z (absorption capacity of comparative example 1) [Structural stability]
- the center part of the absorber manufactured to 100 ⁇ 200 mm was cut to obtain a 100 ⁇ 100 mm absorber.
- the amount of polymer that fell from the cut surface was measured when the vibration was applied 20 times at a speed of Z1 sec once with an amplitude of 5 cm with the cut surface directly below.
- the absorbability of the absorbent polymer was evaluated according to the following criteria.
- ⁇ The percentage of the absorbent polymer that has fallen is 10% or less.
- the absorbent polymer that has fallen off is measured, and the weight of the absorbent polymer that has fallen off is calculated by dividing the weight by the centrifugal retention amount per unit weight of the absorbent polymer that has been dropped off. . Furthermore, the ratio of the absorbent polymer that has dropped out is calculated from the relationship with the amount of the absorbent polymer.
- the amount of the absorbent polymer blended was measured in advance, and the absorbent to be analyzed was immersed in an aqueous solution of ascorbic acid and exposed to sunlight for a sufficient amount of time to completely decompose the absorbent polymer. Let Washing with water and decomposition are repeated, the absorbent polymer is completely dissolved and then dried, and the amount of the absorbent polymer blended can be estimated from the difference in the weight of the absorbent before the decomposition.
- ⁇ The ratio of the absorbent polymer that has fallen is 10% or less, and there is no destruction of the absorber.
- ⁇ The proportion of the absorbent polymer that has fallen out exceeds 10% and is 25% or less, and the absorber is not broken.
- Absorber flexibility was evaluated using a handle meter.
- the measured value of the handle meter indicates that the smaller the value, the better the ease of fitting and the better the fit.
- the measurement method using the handle meter is as follows. Measure according to JIS L1096 (flexibility measurement method). An absorbent body cut to 150 mm in the longitudinal direction and 50 mm in the width direction is placed in a direction perpendicular to the groove on a support base in which a groove having a width of 60 mm is carved. Measure the force required to push the center of the absorber with a 2mm thick blade.
- the apparatus used in the present invention is a texture tester (handle meter method), model HOM-3, manufactured by Daiei Kagaku Seisakusho. The average value of the three points is the measured value. Based on the measured values, flexibility was evaluated according to the following criteria.
- ⁇ The measured value of the Nordró meter is 2N or less.
- ⁇ The measured value of the Nordró meter is over 2N and below 4N.
- the shape of diffusion when the liquid was injected from the center of the absorber was evaluated by the difference in the distance between the long axis and the short axis.
- the liquid was injected at a predetermined amount (40 gZ times, 5 g / sec), and the length of the diffusion area on the long axis side and the short axis side was measured 5 minutes after the completion of absorption.
- the determination was made based on the following criteria.
- ⁇ The ratio of the length of the diffusion area between the major axis side and the minor axis side is 1.5 or more on the major axis side Z minor axis side
- ⁇ Ratio of the length of the diffusion area on the major axis side to the minor axis side However, it is 1.2 or more and less than 1.5 on the long axis side Z short axis side.
- X The ratio of the length of the diffusion area between the major axis side and the minor axis side is the major axis side.
- the absorbers of the examples are those having diffusion anisotropy or parts having different diffusivities.
- the total fiber content of tow was 250,000 dtex. This tow is transported under stretch and air
- the fiber was opened using a fiber opening device to obtain a spread web.
- the web was wound through a spread web between a roll in which a number of disks were incorporated at predetermined intervals around the axis and a smooth receiving roll. Thereafter, the width was adjusted to 100 mm, and then the web transfer speed was reduced and transferred onto a vacuum conveyor, and the web tension on the vacuum conveyor was relaxed to cause crimps.
- the crimp rate of the fibers in the web was 30%, and the number of crimps per cm was 15.
- a superabsorbent polymer polyacrylic acid-based superabsorbent polymer, made by Kao, average particle size 350 m, lump, force density 0.68 g / cm
- the thickness of the web was increased to improve the embedding supportability of the superabsorbent polymer.
- a superabsorbent polymer with a width of 80mm is sprinkled on the web while changing the sprinkling amount, and the superabsorbent polymer is buried in the spread web. I let you.
- the basis weight of the web was 35 gZm 2, and the basis weight of the superabsorbent polymer was continuously changed in the range of 25 to 135 g Zm 2 [see FIG. 28 (c)]. More specifically, set to be an absorber longitudinal ventral end has the lowest basis weight 25GZm 2, most basis weight high 135GZm 2 portions set at 200mm dorsal, then gradually grammage It dropped, the most basis weight absorber longitudinal dorsal end low, and 25GZm 2
- the T-shaped mold has a leg width of 100 mm (only the crotch is 70 mm long, 100 mm from the horizontal bridge), a length of 300 mm, a horizontal width of 125 mm, and a length of 100 mm. It was.
- the basis weight of the fluff norp and the superabsorbent polymer in the laminate was 150 gZm 2 respectively.
- the web was layered on the pile, and the whole was wrapped with a tissue paper having a basis weight of 16 gZm 2 coated with hot melt adhesive. After that, compression was performed between the metal roll and rubber roll (the clearance between the two rolls was set to Omm), and the web and the tissue paper were integrated together, and the web was compressed and the web was compressed by the superabsorbent polymer. The constituent fibers were cut.
- the tissue base was peeled off from the obtained absorbent skin contact surface side, and the fiber length was measured in accordance with the fiber length measurement method.
- the fibers in the obtained absorbent body are the first according to the criteria of the first invention.
- the ratio of fibers divided into each fiber group when divided into the fourth fiber group was as follows.
- Fibers classified in the first fiber group (fiber length less than 100mm): 10%
- Fibers classified into the second fiber group (fiber length 100 mm or more and less than 200 mm): 30% Fibers classified into the third fiber group (fiber length 200 mm or more and less than 300 mm): 43% Classified into the fourth fiber group Fiber (fiber length 300mm or more): 17%
- Spraying the basis weight of the superabsorbent polymer one was 150gZm 2.
- the superabsorbent polymer was embedded and supported in the spread web in the same manner as in Example 11.
- fiber stacking the opening was Furaffunorupu over substantially clove-like mold to obtain stacks of basis weight lOOgZm 2.
- the T-shaped mold is the same as in Example 11.
- a web was layered on the piled fiber, and the whole was hydrophilized and wrapped with a spunbond meltblown meltblown spunbond nonwoven fabric (SMM S) having a basis weight of 16 g Zm 2 to obtain an absorbent body.
- SMM S spunbond meltblown meltblown spunbond nonwoven fabric
- compression was performed between metal rolls and rubber rolls in the same manner as in Example 11, and the constituent fibers of the web were cut with a superabsorbent polymer as the web was compressed.
- the fibers in the obtained absorbent were classified according to the same criteria as in Example 11.
- Table 1 shows the percentage of fibers classified into each fiber group.
- Example 11 After adjusting the width of the web similar to Example 11 to 100 mm, two sets of gears having mutually different pitches were passed through, and the fiber was cut twice. Thereafter, the web conveyance speed was reduced, and thereafter, an absorbent body was obtained in the same manner as in Example 11.
- the fibers in the obtained absorbent were classified according to the same criteria as in Example 11.
- Table 1 shows the percentage of fibers classified into each fiber group.
- 100 parts by weight of the opened fluff pulp and 100 parts by weight of a superabsorbent polymer were uniformly mixed in an air stream to obtain a piled fiber having a total basis weight of 520 gZm 2 .
- the basis weights of the fluff pulp and the superabsorbent polymer were 260 g / m 2 , respectively.
- the obtained fiber stack was wrapped with tissue paper having a basis weight of 16 g / m 2 to obtain an absorbent body.
- a hot melt adhesive 5g, m 2 was spray-coated between the piled fiber and tissue paper, and the two were adhered.
- the average fiber length was 3 mm.
- the obtained absorbent body is fixed to a 45 ° inclined plate, and a certain amount of physiological saline is repeatedly injected into the position 200 mm from the upper end of the absorbent at regular intervals, and the lower end of the absorbent body is injected. The amount of injection until leakage from the part was compared.
- the relative value when the absorption capacity of Comparative Example 11 was 1.0 was calculated using the following formula.
- Absorption capacity (relative value) (absorption capacity of sample) Z (absorption capacity of comparative example 11)
- the distance that flowed on the surface of the absorber for each absorption was calculated, and the average value was calculated. The larger the absorption capacity, the higher the performance. In addition, the shorter the liquid flow distance, the higher the spot absorptivity.
- the diffusion area (liquid spreading area) on the absorber surface is recorded by copying its outline on a transparent sheet 5 minutes after the liquid injection. At this time, if the method of spreading the liquid on the absorber surface (in the examples and comparative examples, the method of spreading the liquid on the tissue paper) and the method of spreading the liquid inside the absorber are recorded. If necessary, the obtained image was processed using image analysis processing software (Image-Pro plus, Media Cybernetics) to determine the diffusion area. The evaluation of the diffusion area was expressed as a relative value with respect to the diffusion area of Comparative Example 11. Considering the effect on the wearer's skin, the diffusion area on the surface of the absorber was used as the evaluation value.
- a crimped acetate long fiber tow was prepared.
- the fiber diameter of this long fiber was 2. ldte X.
- the total fiber content of tow was 250,000 dtex.
- the tow was conveyed under elongation and opened using an air opening device to obtain a spread web.
- the web was wound through a spread web between a roll in which a number of disks were incorporated at predetermined intervals around the axis and a smooth receiving roll. After that, the width is adjusted to 100 mm, and the web width direction center part (the center part leaving 15 mm each on the left and right sides in the width direction) is cut using a bite gear, and then the web conveyance speed is reduced.
- the film was transferred onto a vacuum conveyor, and the web tension on the vacuum conveyor was relaxed to cause crimps.
- the crimp ratio of the fibers in the web was 30%, and the number of crimps per cm was 15.
- a superabsorbent polymer polyacrylic acid-based massive superabsorbent polymer. Average particle size 350 m, force density 0.68 g / cm 3 ) enters.
- the web was made thicker and the embedding supportability of the superabsorbent polymer was improved.
- a superabsorbent polymer having a width of 80 mm was spread on the web, and the superabsorbent polymer was embedded and supported in the spread web.
- the basis weight of the web was 25 gZm 2 and the basis weight of the superabsorbent polymer was 132 gZm 2 .
- the T-shaped mold has a leg width of 100 mm (only the crotch is 70 mm long, 100 mm from the horizontal bridge), a length of 300 mm, a horizontal width of 125 mm, and a length of 100 mm. It was.
- the basis weight of the fluff norp and the superabsorbent polymer in the laminate was 150 gZm 2 respectively.
- the web was layered on the pile, and the whole was wrapped with a tissue paper having a basis weight of 16 gZm 2 coated with a hot melt adhesive. After that, compression was performed between metal rolls and rubber rolls (the clearance between the two rolls was set to Omm), and the web and tissue paper were integrated.
- the mixture of fluff pulp and superabsorbent polymer was removed from the obtained absorbent, and the degree of orientation of the web containing long fibers and short fibers was measured by the method for measuring the degree of orientation.
- the degree of orientation was 1.34.
- the short fibers in the absorbent body were unevenly distributed in the center part in the width direction 80mm (position where the high-absorbent polymer was dispersed).
- Short fibers in the center region in the web width direction The ratio of fibers was 86% (long fibers were 14%), and the ratio of short fibers at both ends in the web width direction was 18%.
- the distribution of short fibers and long fibers was measured by the following method.
- An air-through nonwoven fabric having a basis weight of 25 gZm 2 was used as the top sheet.
- the air-through nonwoven fabric was composed of a core-sheath type composite fiber (thickness: 2.3 dtex, hydrophilically treated with a surfactant to have liquid permeability) with a polypropylene core and a linear low-density polyethylene core.
- the porous film is obtained by uniformly mixing 100 parts by weight of a linear low density polyethylene resin having a density of 0.925 g / cm 2 with 150 parts by weight of calcium carbonate and 4 parts by weight of an ester compound as a third component. After molding, the film was uniaxially stretched twice in the longitudinal direction. Other than that, it was a normal use!
- the absorbent body was arranged so that the orientation direction force of the web coincided with the longitudinal direction of the diaper, and the web side of the long fiber faced the skin of the wearer.
- the dispersion position of the superabsorbent polymer on the web in Example 21 was intermittent in the longitudinal direction (in the range from 100 mm from the front in the longitudinal direction to 350 mm, with a width of 80 mm in the center in the width direction). That is, the superabsorbent polymer was embedded and supported in the spread web in the same manner as in Example 21 except that the spray area was 80 mm wide and 250 mm long. Thereafter, the web width direction center part (the center part leaving 15 mm for each of the left and right end parts in the width direction) was cut using a bite gear as in Example 21. Next, the spread fluff pulp was spread on a substantially T-shaped mold to obtain a piled body having a basis weight of 100 g / m 2 .
- the T-shaped mold is the same as in Example 21.
- Superimposed webs on the stacks, the basis weight 16GZm 2 the whole of these hydrophilic treatment spunbond meltblown meltblown It was wrapped using a spunbond nonwoven fabric (SMMS) to obtain an absorbent body.
- the absorbent body was compressed between a metal roll and a rubber roll in the same manner as in Example 21.
- a mixture of fluff pulp and superabsorbent polymer was removed from the obtained absorbent, and the degree of orientation of the web containing long fibers and short fibers was measured by the above-described method for measuring the degree of orientation.
- the degree of orientation was 1.29.
- the short fibers in the absorber were 78% (22% for long fibers) at the position where the superabsorbent polymer was sprayed, and 12% in the non-polymer spray area. Otherwise, a disposable diaper was obtained in the same manner as in Example 21.
- a web P1 in which the same superabsorbent polymer as used in Example 21 was embedded and supported was produced.
- the degree of fiber orientation of web P1 was 1.41.
- the obtained web P2 is treated with hot air at 135 ° C, the fibers are fused together, and then the superabsorbent polymer is embedded and supported in the stretched direction using the speed ratio between the two rolls. Overlaid on web P1.
- the distribution of short fibers in the absorbent body is 100% for the short fibers on the skin side in the thickness direction, and 4% for the short fibers on the back material side in the web thickness direction (unintentionally cut in the processing step). It was thought that).
- This absorbent was incorporated into the diaper with the web P1 side facing the wearer's skin. Otherwise, it was used in the same manner as Example 21 to obtain a disposable diaper.
- a mixed fiber with a total basis weight of 520 gZm 2 was obtained.
- the basis weights of the fluff pulp and the superabsorbent polymer were 260 g / m 2 , respectively.
- the obtained fiber stack was wrapped with tissue paper having a basis weight of 16 g / m 2 to obtain an absorbent body.
- a hot-melt adhesive 5gZm 2 was spray-coated between the laminated fiber and tissue paper, and the two were adhered.
- the basis weight of the entire absorber was 562 gZm 2 and the thickness was 4.3 mm.
- the degree of orientation of the fibers in the absorbent was 1.05.
- a disposable diaper was obtained in the same manner as in Example 21 except for these.
- the absorbent material was absorbed in the same manner as in Example 21 except that it was compressed by a roll, that is, the fiber was not cut (configured to be substantially free of short fibers). The body was made. A disposable diaper was obtained in the same manner as in Example 21 except for these.
- a crimped acetate long fiber tow was prepared.
- the fiber diameter of this long fiber was 2. ldtex and the total fiber content of tow was 250,000 dtex.
- the tow was opened using an air opening device under elongation to obtain a spread web.
- the web was passed through a spread web between a roll in which a large number of disks were assembled at predetermined intervals around the axis and a smooth receiving roll. Thereafter, the web was adjusted to a width of 100 mm, transferred to a vacuum conveyor with the conveyance speed reduced, and the tension of the web on the vacuum conveyor was released to cause crimping.
- the crimp rate of the web was 30% and the number of crimps per centimeter was 15.
- Absorbent polymer 130gZm 2 was sprayed on the web in a 70 mm wide region in the center in the width direction to obtain a first web pi in which the polymer particles were embedded and supported in the spread web.
- a mass (IM930) of Sundia Polymer Co., Ltd. was used as the absorbent polymer.
- the whole was wrapped in a tissue paper having a basis weight of 16 gZm 2 spray-coated with a hot melt adhesive 5 gZm 2 to obtain an absorbent body p3.
- a fluff pulp layer having a basis weight of lOOgZm 2 is located on the side farthest from the skin.
- the basis weight of the entire absorbent body was 390 gZ m 2 and the thickness was 2.2 mm.
- the basis weight of each spread web was 13 g / m 2 .
- the absorbent p3 was passed between a pair of smooth rolls, one of which was an elastic material and the other was a hard material, and the long fiber tow was cut only at the 70 mm wide portion in the center in the width direction.
- Each embossed shape was circular with a diameter of 0.5cm and staggered with a pitch of 0.5cm.
- the absorber was evaluated by assuming that the direction of the web is aligned with the longitudinal direction of the diaper.
- Example 32 Except that the spraying basis weight of the absorbent polymer was l lOgZm 2 particles similarly absorbent Po Rimmer Example 31 to obtain a web pi that is embedded carried in the opening web. Next, 100 parts by weight of the opened fluff pulp and 100 parts by weight of the absorbent polymer were uniformly mixed in an air stream to obtain a mixture m having a total basis weight of 300 gZm 2 . The basis weight of the fluff norp and the superabsorbent polymer in the mixture was 150 gZm 2 , respectively. Overlapping mixture m the web pi, it wraps using these parent hydration treatment the basis weight 16GZm 2 spunbond meltblown spunbond nonwoven (S MS), to obtain an absorbent. The basis weight of the entire absorber was 362 gZm 2 and the thickness was 2 mm. Other than that was carried out similarly to Example 31, and obtained the absorber.
- S MS basis weight 16GZm 2 spunbond meltblown spunbond nonwoven
- Example 32 the fiber diameter of the long fibers is 6.7 dtex, the total fiber amount of the tow is 17,000 dtex, the crimp rate of the long fibers in the web is 24%, and the number of crimps per cm is 10 pieces.
- a laminate was obtained in the same manner as in Example 32 except that the average basis weight of the web was changed to 30 gZm 2 . Other than that was carried out similarly to Example 32, and obtained the absorber.
- 100 parts by weight of the opened fluff pulp and 100 parts by weight of the absorbent polymer were uniformly mixed in an air stream to obtain a piled body having a total basis weight of 520 gZm 2 .
- the basis weights of the fluff pulp and the superabsorbent polymer were 260 g / m 2 , respectively.
- the obtained piled fiber was wrapped with tissue paper having a basis weight of 16 g / m 2 to obtain an absorbent.
- a hot-melt adhesive 5gZm2 was spray-coated between the laminated fiber and tissue paper, and the two were adhered. Except these, an absorber was obtained in the same manner as in Example 31.
- Example 31 an absorbent body was prepared in the same manner as in Example 31 except that the force was applied without compressing the roll, that is, cutting the fiber. [0353] [Performance evaluation]
- the absorption capacity of the absorbers obtained in Examples and Comparative Examples was measured by the following method, and the structural stability and flexibility were evaluated.
- the absorber on which the surface material was arranged was placed on a flat surface, and the shape of the diffusion on the surface material surface when the liquid was injected from the center of the absorber was evaluated.
- the liquid was injected by injecting a predetermined amount (40 gZ, 5 gZsec), and after 5 minutes from the end of absorption, the diffusion state was copied onto a transparent sheet, and the diffusion area was measured by image analysis.
- the diffusivity differs between the skin contact surface and the inside of the absorber or between the absorber central portion and the absorber short portion, the value of the skin contact surface was measured.
- the obtained measured value was divided by the diffusion area of the absorbent body of Comparative Example 1, that is, the relative value of the value when the value of Comparative Example 31 was 1.0. 1. If the value is greater than 0, the diffusion area is assumed to be wider. Judgment was performed based on the following criteria. ⁇ : The diffusion area is 0.8 or less with respect to the value of Comparative Example 31
- the diffusion area is 1.0 or more with respect to the value of Comparative Example 31 (having equivalent or higher diffusibility)
- the absorbent body of the present invention is flexible and excellent in absorption performance, can control the diffusion of the liquid and efficiently prevent liquid leakage, and is easy to manufacture.
- the absorbent body of the first or second invention is flexible, has excellent spot absorbability, and is less likely to be broken or distorted by an external force applied during use. Moreover, the manufacturing method of the absorber of this invention can manufacture such an absorber efficiently.
- the absorber of the third invention can efficiently prevent liquid leakage by controlling the diffusion of the liquid.
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Description
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Priority Applications (4)
Application Number | Priority Date | Filing Date | Title |
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US12/225,489 US8373016B2 (en) | 2006-03-23 | 2007-03-19 | Absorbent member and method of producing the same |
KR1020087024150A KR101400703B1 (ko) | 2006-03-23 | 2007-03-19 | 흡수체 및 그 제조방법 |
EP07739007A EP2005926B1 (en) | 2006-03-23 | 2007-03-19 | Absorbent member and method of producing the same |
CN200780010310XA CN101404970B (zh) | 2006-03-23 | 2007-03-19 | 吸收体及其制造方法 |
Applications Claiming Priority (8)
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JP2006081587 | 2006-03-23 | ||
JP2006-081587 | 2006-03-23 | ||
JP2006-311474 | 2006-11-17 | ||
JP2006311473A JP4863847B2 (ja) | 2006-11-17 | 2006-11-17 | 吸収体 |
JP2006311470A JP4901433B2 (ja) | 2006-03-23 | 2006-11-17 | 吸収体及びその製造方法 |
JP2006-311473 | 2006-11-17 | ||
JP2006-311470 | 2006-11-17 | ||
JP2006311474A JP4863848B2 (ja) | 2006-11-17 | 2006-11-17 | 吸収性物品の吸収体及びその製造方法 |
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US (1) | US8373016B2 (ja) |
EP (1) | EP2005926B1 (ja) |
KR (1) | KR101400703B1 (ja) |
CN (1) | CN101404970B (ja) |
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JP2017119055A (ja) * | 2015-12-29 | 2017-07-06 | ユニ・チャーム株式会社 | 長繊維を含むウェブを有する吸収体を含む吸収性物品 |
WO2017115544A1 (ja) * | 2015-12-29 | 2017-07-06 | ユニ・チャーム株式会社 | 長繊維を含むウェブを有する吸収体を含む吸収性物品 |
JP2018139937A (ja) * | 2017-02-28 | 2018-09-13 | 大王製紙株式会社 | パッドタイプ使い捨ておむつ |
WO2020137425A1 (ja) * | 2018-12-29 | 2020-07-02 | ユニ・チャーム株式会社 | 吸収性物品 |
JP2020108744A (ja) * | 2018-12-29 | 2020-07-16 | ユニ・チャーム株式会社 | 吸収性物品 |
JP7304800B2 (ja) | 2018-12-29 | 2023-07-07 | ユニ・チャーム株式会社 | 吸収性物品 |
Also Published As
Publication number | Publication date |
---|---|
KR101400703B1 (ko) | 2014-05-29 |
CN101404970B (zh) | 2012-12-12 |
US20100022978A1 (en) | 2010-01-28 |
US8373016B2 (en) | 2013-02-12 |
TW200744545A (en) | 2007-12-16 |
EP2005926A4 (en) | 2010-12-01 |
EP2005926B1 (en) | 2012-08-15 |
KR20090007691A (ko) | 2009-01-20 |
EP2005926A1 (en) | 2008-12-24 |
CN101404970A (zh) | 2009-04-08 |
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