JP3209364B2 - Disposable diapers - Google Patents

Description

DETAILED DESCRIPTION OF THE INVENTION

[0001]

BACKGROUND OF THE INVENTION 1. Field of the Invention The present invention relates to a disposable diaper, and more particularly to a disposable diaper used for infants, adults and incontinent persons.

[0002]

2. Description of the Related Art A conventional disposable diaper includes, as disclosed in Japanese Patent Publication No. 52-40267, a liquid-permeable top sheet and a liquid-impermeable back sheet.
A diaper main body is constituted from the absorbent body located between these two sheets, a stretchable elastic member is arranged on a side flap extending to the left and right of the diaper main body to form a gather, and a back side of the side flap In general, a so-called flat type diaper intended to improve fit and leakproofness by disposing fasteners at both side edges of the diaper so as to be adjustable. Further, as disclosed in Japanese Patent Application Laid-Open No. 62-250201, there has been known one in which the gathers of the leg portion are three-dimensionally formed, and the flap portion around the absorber is made water-repellent to enhance the leakage prevention effect. .

Recently, however, as disclosed in Japanese Patent Application Laid-Open No. 57-77304, the abdominal region and the dorsal region of a pair of left and right side flaps have been designed to improve fit and fit. A so-called pants-type disposable diaper has been proposed in which a pair of left and right leg openings and a waist opening are respectively formed by bonding and fixing. The pants-type disposable diaper is configured such that a leg opening and a waist opening are formed to be extendable and contractable, respectively, to fit a body shape. Such pants-type disposable diapers can usually be worn by the wearer in an upright position, and can be used for toilet training to promote the infant's "diaper detachment", or for incontinent persons or people who have difficulty walking. It is considered useful for possible adults.

[0004]

However, in the above-mentioned conventional underpants-type disposable diaper, the crotch must be formed narrow, so that the elastic member cannot be arranged separately from the absorber. As a result, it was difficult to exhibit the original elastic properties due to the influence of the rigidity of the absorber. At the same time, wrinkles and gaps are apt to occur at the joints at both side edges due to the elastic members, which cause the excrement to leak. In addition, three-dimensional leg gathers, which are effective as leak prevention measures, also have problems in that the crotch is narrow and there is difficulty in manufacturing.

[0005] The water-repellent surrounding technique, which is effective as a measure to prevent the leakage of excrement, particularly urine, is also used in a pants-type diaper. Since it could not be formed, a sufficient effect could not be exhibited. In addition, conventional disposable diapers absorb and retain excrement only in the vicinity of the urination point, and only such a portion becomes dirty, and other portions, for example, the sides of the waist, are not substantially soiled. Therefore, discarding the entire diaper is wasteful and uneconomical.

SUMMARY OF THE INVENTION Accordingly, an object of the present invention is to provide a pants-type disposable diaper which can effectively prevent excretion from leaking, has no irregularities, and has excellent followability to a wearer in a crotch portion. It is another object of the present invention to provide a pants-type disposable diaper in which only a stained portion caused by excrement can be replaced.

The present invention relates to an absorbent body having a liquid-permeable topsheet, a liquid-impermeable and vapor-permeable backsheet opposed thereto, and an absorber disposed between the two sheets. Pants having an outermost layer sheet to which the absorbent body is joined, and a waist opening and a pair of leg openings formed by joining and fixing both side edges of the abdominal side and the back side of the outermost layer sheet. In the mold disposable diaper, the outermost layer sheet is formed of a single-layer fibrous sheet at a central portion in a cross section, and a plurality of fibrous sheets and a plurality of fibrous sheets are formed on both side edges forming the leg openings. Liquid impermeable and vapor permeable filter sandwiched by
The above object has been achieved by providing a disposable diaper comprising a lum and a stretchable elastic member, wherein a first leg gather is formed in the leg opening by the stretchable elastic member.

[0008]

According to the disposable diaper of the present invention, the absorbent main body joined to the outermost layer sheet is applied to the wearer's crotch and worn in the same manner as ordinary underwear.
Since the leg opening of the outermost sheet of the pants-type is fitted to the wearer's leg by the first leg gather, leakage from such a portion is reliably prevented. Further, since the central portion of the outermost layer sheet is formed of only a single-layer fibrous sheet, the central portion is excellent in moisture permeability and can prevent unevenness during wearing. Moreover, the first leg gather portion is sandwiched and joined by a plurality of fibrous sheets , and is liquid-impermeable and vapor-permeable.
Since it is composed of the elastic film and the elastic member, the leakage of urine from the first leg gather can be reliably prevented. Further, since the central portion of the outermost layer sheet is formed as a single layer, the portion is excellent in following the crotch of the wearer.

[0009] In the disposable diaper of the present invention,
If elastic members are provided on both side edges of the absorbent main body and the second leg gathers are formed by the elastic members, leakage of excrement can be more reliably prevented by the second leg gathers. Further, in the disposable diaper of the present invention, if the absorbent main body is detachably joined to the outermost layer sheet, the outermost layer sheet is reused by replacing the used absorbent main body with another unused absorbent main body. It is possible to

[0010]

Embodiments of the present invention will be described below in detail with reference to the accompanying drawings.

A disposable diaper 1 according to an embodiment of the present invention.
Is a so-called pants-type disposable diaper, and as shown in FIGS. 1 and 2, a liquid-permeable top sheet 15;
An absorbent body 3 having a liquid-impermeable and vapor-permeable back sheet 16 opposed thereto and an absorber 17 disposed between the two sheets; and An outermost layer sheet 2 that surrounds the waist of the outermost layer and holds the absorbent body against the wearer, and has both side edges 22a of the abdominal part and the back part of the outermost layer sheet 2;
A pants-type disposable diaper in which a waist opening 11 and a pair of leg openings 7 are formed by bonding and fixing the outermost sheet 22b. A pair of fibrous sheets 23a, 23b and fibrous sheets 23a, 23b,
3b, a first leg gather 24a is formed in the leg opening 7 by a first elastic member 24 (hereinafter, referred to as a first elastic member). In this embodiment, the fibrous sheet 21 and the fibrous sheet 23a are formed by one sheet.

A stretchable elastic member (hereinafter, referred to as a second stretchable elastic member) 26 is provided on both side edges of the absorbent main body 3, and a second leg gather 26a is formed by the second stretchable elastic member 26. . The outermost layer sheet 2 is formed to have a substantially larger size than the absorbent main body 3, and the absorbent main body 3 is detachably fixed to the substantially central portion in the longitudinal direction thereof with an adhesive A. On both sides of the outermost layer sheet 2 to which the absorbent body 3 is adhered, concave notches 6 are formed, and both side edges 22a of the abdominal side and the back side of the outermost layer sheet 2 are formed. , 22b are joined and fixed,
Leg openings 7, 7 are formed at portions 6, 6, so that a pants-type diaper is formed. In the outermost layer sheet 2, a pair of left and right side flaps 8, 8 are respectively located outward (in the width direction) above (rear side) and below (abdominal side) the constricted portion where the recess 6 is formed. 9, 9 are extended. The respective edges of the side flaps 8, 8 and 9, 9 are fused to each other to form a pants shape.

A pair of waist flaps 10a and 10b extending outward from the absorbent main body 3 are provided at both end edges in the longitudinal direction of the outermost layer sheet 2 to form a pants-type diaper. , A waist opening 11 is formed. Waist flaps 10a, 10b
, A third elastic member 12 is stretched to form a waist flap gather 12a, and the above-described first elastic member 24 is stretched to the concave notch 6 of the side flap. 24a is formed to enhance the fit to the wearer when worn and to prevent slippage. In addition, a fifth elastic member 14 is stretched between the waist opening 11 and the leg openings 7, 7 when worn, so as to enhance the fit around the wearer's waist.

The central portion 2 in the cross section of the outermost sheet 2
Numeral 0, as shown in FIG. 3, is formed of a single-layer fiber sheet 21 to release the humidity of the absorber 17 in the absorbent main body 3, thereby preventing unevenness during wearing. Further, by using a single layer, the followability of the central portion is enhanced, and the followability of the crotch to the wearer is excellent. The both side edges 22c, 22c forming the leg opening 7 in the outermost layer sheet 2 are formed by a plurality of fibrous sheets 23a, 23b and a first elastic elastic member 24 sandwiched and joined by the fibrous sheets 23a, 23b. The side edges 22c, 22c at least 2
By forming a layer structure, the side edges 22c, 22c
The liquid leakage at is surely prevented.

In this embodiment, the fiber sheet 21 in the central portion 20 and the fiber sheet 23 below the both side edges 22c are provided.
a is used as a common sheet. That is, FIG.
As shown in the figure, another fiber sheet 23b is overlaid on both side edges 22c of one fiber sheet 23a (21).
A liquid-impermeable and moisture-permeable film 27 is further disposed between the fiber sheet 23a and the fiber sheet 23b. In the present embodiment, both side edges 22c of the outermost sheet 2 are consequently three layers. It has a structure. In this three-layer structure, the first elastic member 24 is sandwiched between the film 27 and the fiber sheet 23b. That is, the elastic member 24 is formed of a liquid-impermeable and vapor-permeable film 27.
The film 27 is attached to a plurality of fibrous sheets 23.
a and 23b. Since the diaper of the present invention has such a three-layer structure including the film 27, it is possible to more reliably prevent the liquid from leaking from the portion.

The fibrous sheets 23a and 23b are made of, for example, fibers made of polyethylene, polypropylene, polyester, or the like, or hydrophobic sheets formed by a spunbond method, a heat bond method, or a hydroentanglement method using composite fibers of these. One or more layers of non-woven fabric are used, and considering texture, strength, and urine absorption, 5 to 3
5 g / m ² is used. Further, in order to prevent the leakage of urine, it is more preferable that the surface is treated with a water repellent. As the liquid-impermeable and moisture-permeable film 27, for example, a film obtained by adding an inorganic filler such as calcium carbonate to a thermoplastic resin such as polyolefin and using the same is used.

When the absorbent main body 3 is bonded to the outermost layer sheet 2, the second elastic body 24 is stretched in the recess 6.
The first leg gathers 24a and the second leg gathers 26a are formed so as not to sequentially overlap each other. The absorbent body 3 is provided with a liquid-permeable top sheet 15 that forms a side in contact with the wearer's skin.
And a liquid-impermeable backsheet 16 corresponding to the topsheet 15 and an absorber 17 interposed between the topsheet 15 and the backsheet 16. Further, the absorbent main body 3 has a pair of left and right main body flaps 18 extending outward from both side edges of the absorbent body 17 in the width direction. Is formed by the top sheet 15 and the back sheet 16 which are extended. The body flaps 18, 1
8, a second leg gather 26a,
26a so as to form the second elastic members 26, 2
6 is stretched along the longitudinal direction of the absorbent main body 3.

The main body flaps 18, 18 are free ends, and the absorbent main body 3 has its back sheet 16
Is adhered to the central portion 20 of the outermost layer sheet 2 by an adhesive A in a releasable manner. Therefore, the second leg gathers 2 are formed by the second elastic members 26, 26.
6a and 26a are easily formed.

Next, the material of the main components of this embodiment will be described. The top sheet 15 absorbs the excrement
Preferably, the liquid-permeable sheet having a feel close to that of underwear is used as the liquid-permeable sheet, and as such a liquid-permeable sheet, for example, a woven fabric, a nonwoven fabric, a porous film, or the like is preferable. Further, a method of applying a hydrophobic compound such as a silicone-based oil agent or paraffin wax to the periphery of the top sheet 15 or a method of applying a hydrophilic compound such as an alkyl phosphate ester in advance and washing the periphery with warm water is used. By performing water treatment, it is possible to prevent leakage due to bleeding of urine and the like in the peripheral portion.

The back sheet 16 is made of a thermoplastic resin to which a filler is added and stretched, and is a moisture-permeable liquid impervious sheet or a sheet having a feel similar to underwear, for example, a composite material of a film and a nonwoven fabric or a film and a nonwoven material. A composite material of cloth or the like is used. The absorbent 17 is preferably composed mainly of fibrillated pulp and used in combination with a high-molecular-weight water-absorbing polymer, and is also preferably one obtained by heat-treating a mixture of a thermoplastic resin, cellulose fibers, and a high-molecular-weight water-absorbing polymer. The location of the high-molecular-weight water-absorbing polymer may be any of the upper layer, the middle layer, and the lower layer, and may be a mixture with pulp. The high-molecular water-absorbing polymer has a retaining performance of absorbing and holding a liquid 20 times or more its own weight, and is preferably in the form of particles having a gelling property. For example, a starch-acrylic acid (salt) graft copolymer, a starch-acrylonitrile acid (salt) polymer and the like are preferable. The shape of the absorber 17 is preferably an hourglass shape that matches the body shape of the wearer, but may be rectangular.

First, second, third, and fourth elastic members 2
4, 26, 12, and 14 are joined to the absorbent main body 3 and the outermost layer sheet 2 in a generally stretched state by using a means known in the art such as ultrasonic welding, heat welding, and an adhesive. As the material, any material known in the industry such as thread rubber, flat rubber, film-type rubber or tape-like foamed polyurethane can be used, and one or a plurality of materials may be used. It is particularly preferable that the elastic member has a stress of 70 to 100 g at 150% elongation.

As the adhesive A, a known adhesive which can be peeled off is used, and is adhered in a dot-like or linear manner inside the absorbent main body 3, preferably inside the absorber 17. As the material of the adhesive A, hot melt adhesive, styrene
Butadiene copolymer, acrylate copolymer, vinyl acetate, ethylene / olefin copolymer, petroleum resin, cold glue and the like are used.

Next, the operation of this embodiment will be described.
The pants-type diaper of the present embodiment has a waist opening 11 as shown in FIG. 1 by joining both side edges of the side flaps 8 and 9 of the outermost layer sheet 2 in the unfolded state shown in FIG.
And a pair of leg openings 7, 7 formed in a pants-type diaper. In this diaper, an absorbent main body 3 is detachably adhered to the outermost layer sheet 2 by an adhesive A inside the outermost layer sheet 2. The side edges of the side flaps 8 and 9 are the side edges 22a and 22b of the abdomen and the back of the outermost layer sheet 2, respectively.
In order to wear the pants-type diaper of the present embodiment, both feet are passed through the waist opening 11, the pants-type diaper is pulled up, and the legs are passed through the leg openings 7,7. The diaper of this embodiment, which is worn as described above, has the waist flap gathers 12a and the first leg openings 7 in the waist opening 11 of the outermost layer sheet 3 during wearing.
The leg gathers 24a are formed, and the fitting property to the wearer, the following property, and the leak preventing property are achieved. Furthermore, the fit to the wearer around the waist is improved by the fourth elastic member 14. Also, in the diaper of this embodiment, as shown in FIG. 3, the absorbent main body 3 is adhered to the outermost layer sheet 3 only at the central portion thereof during wearing, so that the Since the flap 18 is easily erected to form a bag, the excrement can be reliably held in the bag.

Further, the diaper according to the present embodiment comprises an absorbent body 3
, A second leg gather 26a is formed to prevent the excrement and the like from leaking from the absorbent main body 3 to the outermost layer sheet 2. Further, since the second gather 26a is formed together with the first leg gathers 24a of the leg openings 7, 7 of the outermost layer sheet 2, that is, a double gather is formed, so that leakage from the legs is prevented. It is more reliably prevented. Moreover, the central portion 20 in the transverse direction of the outermost layer sheet 2 is formed of a single-layer fiber sheet, and since the single-layer sheet 21 supports the absorbent main body 3, moisture permeability is not impaired, and unevenness during wearing is prevented. While being prevented, the fit of the crotch to the wearer is enhanced. On the other hand, both side edges 22c of the outermost layer sheet 2 forming the first leg gathers 24a are formed by a plurality of fiber sheets 23a, 23b,
And the support film 27, the leakage of urine from the side edges 22c is more reliably prevented. Then, after excretion of the excrement, the absorbent main body 3 is peeled off from the outermost layer sheet 2 and a new absorbent main body 3 is bonded and replaced with the outermost layer sheet 2 with the adhesive A. in this way,
According to the embodiment of the present invention, it is possible to easily replace only the absorbent main body which is contaminated with excrement.

The present invention is not limited to the above-described embodiment, but can be variously modified without departing from the gist of the present invention. For example, as shown in FIG. 4, the first elastic members 24 may be arranged so as to intersect at the center of the concave portion 6 of the outermost layer sheet 2. Further, the shape of the absorbent main body may be a simple configuration having a substantially square shape. ADVANTAGE OF THE INVENTION According to the disposable diaper of this invention, leakage of excrement can be prevented effectively, there is no unevenness, and the followability to the wearer in the crotch part is excellent. Further, according to the disposable diaper of the present invention, it is possible to replace only the stained portion with the excrement.

[0026]

As described above, the disposable diaper of the present invention can effectively prevent excretion from leaking, is free from irregularities, and has excellent followability to the wearer in the crotch. Further, in the disposable diaper of the present invention, it is possible to replace only the stained portion with the excrement.

[Brief description of the drawings]

FIG. 1 is a perspective view of a disposable diaper according to one embodiment of the present invention.

FIG. 2 is a partially cutaway plan view of the disposable diaper shown in FIG. 1 in a developed state.

FIG. 3 is a cross-sectional view of the disposable diaper shown in FIG. 2 taken along the line III-III.

FIG. 4 is a plan view of a disposable diaper according to another embodiment of the present invention.

[Explanation of symbols]

DESCRIPTION OF SYMBOLS 1 Disposable diaper 2 Outermost sheet 3 Absorbent main body 7 Leg opening 11 Waist opening 15 Topsheet 16 Backsheet 17 Absorber 20 Central part 21 Single-layer fibrous sheet 22 Both side edges 23a, 23a Plural fibrous sheets 24 Elastic elastic member forming first leg gather (first elastic elastic member) 24a First leg gather 26 Elastic elastic member forming second leg gather (second elastic elastic member) 26a Second leg gather

──────────────────────────────────────────────────続 き Continued on the front page (58) Field surveyed (Int.Cl. ⁷ , DB name) A61F 13/15-13/84

Claims (3)

(57) [Claims] 1. An absorbent body having a liquid-permeable topsheet, a liquid-impermeable and vapor-permeable backsheet opposed thereto, and an absorber disposed between the two sheets, and the absorbent body. A disposable diaper having an outermost layer sheet to which the elastic body is joined, and joining and fixing both side edges of the abdominal side and the back side of the outermost layer sheet to form a waist opening and a pair of leg openings. The outermost layer sheet has a single-layered fibrous sheet at the center in the cross section, and a plurality of fibrous sheets sandwiches both side edges forming the leg openings. Liquid impermeable and vapor permeable fill to be joined
Constituted by the arm and extensible elastic member, disposable diaper, characterized in that the said stretchable elastic member to form a first leg gather in the leg-opening. 2. The disposable diaper according to claim 1, wherein a stretchable elastic member is provided on both side edges of the absorbent body, and a second leg gather is formed by the stretchable elastic member. 3. The disposable diaper according to claim 1, wherein the absorbent main body is detachably joined to the outermost layer sheet.