JP2010119454A - Absorbent article - Google Patents

Abstract

<P>PROBLEM TO BE SOLVED: To provide an absorbent article effectively preventing backward flow of menstrual blood and leakage of bodily fluid from the rear, and acquiring excellent leakage preventive properties. <P>SOLUTION: The sanitary napkin 1A is vertically long, and includes a front surface sheet 2 formed on the skin-abutting surface side, a rear surface sheet 3 formed on the non-skin-abutting surface side, and an absorber 4 interposed between the sheets 2 and 3. The front surface sheet 2 has a plurality of fluid flow preventive walls 8 extending in the lateral direction in a rear area (b) in the rear of an excretion area (a) abutting to a bodily fluid excretion part of a wearer. The fluid flow preventive walls 8 are intermittently arranged side by side in the longitudinal direction of the sanitary napkin 1A. The fluid flow preventive wall 8 in the rear area b includes a rear side center preventive wall 81B and a pair of rear side outer preventive walls 82B and 82B formed outward from the rear side center preventive wall 81B in the lateral direction. The front surface sheet 2 in the rear area (b) is composed of the rear side center preventive wall 81B, the rear side outer preventive walls 82B and a groove 9 dividing the walls. <P>COPYRIGHT: (C)2010,JPO&INPIT

Description

  The present invention relates to an absorbent article such as a sanitary napkin, a panty liner (cage sheet), and an incontinence pad.

  When sleeping in the supine state, if a space is created between the wearer's skin and the sanitary napkin, menstrual blood travels back through the wearer's skin, causing so-called transmission leakage. In order to increase the adhesion between the wearer's skin and the sanitary napkin and prevent transmission leakage, for example, Patent Document 1 discloses a sanitary napkin having a three-dimensional structure raised from the surface sheet of the sanitary napkin. ing.

  However, the three-dimensional structure portion of the sanitary napkin described in Patent Document 1 is formed by expansion and contraction of an elastic member extending in the longitudinal direction of the sanitary napkin, and has one large convex shape that is long in the longitudinal direction. When a large amount of menstrual blood flows, menstrual blood flows on the surface of the three-dimensional structure, and there is a possibility that leakage will occur.

JP 2005-334294 A

  Accordingly, an object of the present invention is to provide an absorbent article that can effectively prevent the flow of menstrual blood from the rear and the leakage of body fluid from the rear, and can obtain excellent leakage prevention properties. .

  The present invention is a vertically long absorbent article comprising a top sheet formed on the skin contact surface side, a back sheet formed on the non-skin contact surface side, and an absorber interposed between both sheets, In the top sheet, a plurality of liquid flow prevention walls extending in the width direction are intermittently juxtaposed in the longitudinal direction of the absorbent article in the rear region of the excretion part region in contact with the body fluid excretion part of the wearer. The liquid flow prevention wall in the rear region has a rear central prevention wall and a rear outer prevention wall formed outward in the width direction from the rear central prevention wall. The above-mentioned object is achieved by providing an absorbent article in which the top sheet is composed of the rear central prevention wall, the rear outer prevention wall, and grooves that partition them. .

  According to the absorbent article of the present invention, it is possible to effectively prevent the menstrual blood flow from the rear and the body fluid from leaking from the rear, and an excellent leak-proof property can be obtained.

  Hereinafter, a preferred embodiment of a sanitary napkin that is an absorbent article of the present invention will be described with reference to FIGS.

As shown in FIG. 1, the absorbent article (sanitary napkin) 1A of the first embodiment is formed symmetrically with respect to a center line CL extending in the longitudinal direction of the sanitary napkin 1A.
The sanitary napkin 1A of 1st Embodiment is as shown in FIGS. 1-3, the surface sheet 2 formed in the skin contact surface side, the back sheet 3 formed in the non-skin contact surface side, and both sheets It is a vertically long one having an absorber 4 interposed between two and three. As shown in FIGS. 1 to 3, the top sheet 2 of the sanitary napkin 1 </ b> A has a width direction (center line) in the rear region b extending behind the excretory region a abutting against the body fluid excretion unit of the wearer. A plurality of liquid flow prevention walls 8 extending in the direction perpendicular to CL) are intermittently arranged in the longitudinal direction (CL line direction; direction parallel to the center line CL) of the sanitary napkin 1A.

  Here, the “excretion part region a” is usually the longitudinal direction of the absorbent article (the sanitary napkin 1A) in the absorbent article having the wing part 31 like the sanitary napkin 1A of the first embodiment. The region having wing portions 31 and 31 in FIG. The excretion part area | region a in the absorbent article which does not have the wing part 31 is a sanitary napkin about two fold lines orthogonal to the product longitudinal direction (CL line direction) produced when a sanitary napkin is folded by individual packaging form. A region that is the same as or narrower than the region surrounded by the first fold line and the second fold line when counted from the front end in the longitudinal direction. When the sanitary napkin has a long product length and three fold lines are generated, the region surrounded by the first fold line and the second fold line or the product longitudinal direction counting from the front end in the product longitudinal direction (CL line direction) An area that is the same as or narrower than the area surrounded by the first fold line and the third fold line is counted from the front end of the line.

  The sanitary napkin 1A of the first embodiment will be described in detail. As shown in FIG. 1, the sanitary napkin 1A is excreted in contact with the body fluid excretion part of the wearer in the longitudinal direction (CL line direction). A partial region a (region having the wing portion 31), a rear region b behind the excretory region a, and a front region c ahead of the excretory region a. As shown in FIGS. 1 to 3, the sanitary napkin 1 </ b> A includes a liquid-permeable top sheet 2, a liquid-impermeable or water-repellent back sheet 3, and an absorber 4, and the top sheet 2 and the absorber 4. A pair of grooves 9 are fixed. The groove 9 extends in the longitudinal direction (CL line direction) on both sides of the sanitary napkin 1A. Each of the top sheet 2 and the back sheet 3 has a larger outer diameter dimension in the longitudinal direction (CL line direction) than the absorber 4. The top sheet 2 and the back sheet 3 extend from both ends b1 and c1 in the longitudinal direction (CL line direction) of the sanitary napkin 1A from both ends in the longitudinal direction (CL line direction) of the absorbent body 4, and the extension The parts are joined together by heat sealing or the like to form the absorbent main body 5. The sanitary napkin 1A according to the first embodiment includes a pair of leak-proof walls 7 and 7 that are located on both sides on the skin contact surface side and extend in the longitudinal direction. 1 A of sanitary napkins of 1st Embodiment have a pair of wing part 31 in the position ahead of the center part in the longitudinal direction. The wing part 31 is formed by extending the back sheet 3, and on the back surface thereof, an adhesive part for fixing the wing part 31 to the outer surface (non-skin facing surface) of the crotch part of the underwear ( (Not shown) is formed.

Next, the liquid flow prevention wall 8 formed on the skin contact surface of the top sheet 2 of the sanitary napkin 1A of the first embodiment will be described.
The liquid flow prevention wall 8 is provided on the upper surface of the rear region b, and is preferably also provided on the upper surface of the front region c. In the first embodiment, as shown in FIG. It is provided on the upper surface of the front area c. The liquid flow prevention wall 8 is preferably provided in a region where the leakage prevention wall 7 is not raised in the rear region b or the front region c. In the first embodiment, as shown in FIG. It is provided in the whole area of the area | region b where the leak-proof wall 7 does not stand up and the front area | region c. As shown in FIGS. 1 to 3, the liquid flow prevention wall 8 is formed to extend in the width direction (direction perpendicular to the center line CL). It is preferable that the liquid flow prevention wall 8 does not have the liquid introduction hole 10. Here, “does not have the liquid introduction hole 10” means that a hole for guiding menstrual blood to the absorber 4 and facilitating absorption is formed in the constituent material of the liquid flow prevention wall 8. That means not.

  As shown in FIGS. 1 and 2, the liquid flow prevention walls 8 in the rear region b are provided in 2 to 80, preferably 10 to 60. As shown in FIG. 1, the liquid flow prevention walls 8 in the front region c are provided with 2 to 50, preferably 4 to 30. As shown in FIGS. 1 and 2, the plurality of liquid flow prevention walls 8 are intermittently arranged in parallel in the longitudinal direction (CL line direction) of the sanitary napkin 1 </ b> A. As shown in FIGS. 1 and 2, the plurality of liquid flow prevention walls 8 are provided at substantially equal intervals in the longitudinal direction (CL line direction) of the sanitary napkin 1 </ b> A. The interval of 8 is 0.5 mm to 10 mm.

  As shown in FIG. 3, the liquid flow prevention wall 8 in the rear region b is formed on the rear side central prevention wall 81 </ b> B and outward in the width direction (direction perpendicular to the center line CL) from the rear side central prevention wall 81 </ b> B. A pair of rear outer prevention walls 82B and 82B are provided, and the rear center prevention wall 81B and the rear outer prevention wall 82B are formed discontinuously. That is, the surface sheet 2 in the rear region b includes a rear center prevention wall 81B, a rear outer prevention wall 82B, and a groove 9 (a rear groove 92 described later) that partitions the 81B and 82B. Similarly, the liquid flow prevention wall 8 in the front region c includes a front center prevention wall 81C and a pair of front outer sides formed outward from the front center prevention wall 81C in the width direction (direction perpendicular to the center line CL). The front central prevention wall 81C and the front outer prevention wall 82C are discontinuously formed. That is, the front sheet 2 in the front region c includes a front center prevention wall 81C, a front outer prevention wall 82C, and a groove 9 (a front groove 93 to be described later) that partitions the 81C and 82C.

  The rear center prevention wall 81B and the front center prevention wall 81C are formed in the center region (CT) in the width direction (direction perpendicular to the center line CL) of the sanitary napkin 1A. Here, the “width-direction central region (CT)” in the rear region b is a pair of rear outer grooves 92 in a region sandwiched between a pair of rear outer grooves 92 and 92, which will be described later, shown in FIG. A band-like region extending in the longitudinal direction (CL line direction) having a reference width of a portion 92a having the widest interval between the 92's. The outer outer prevention wall 82B is formed outward from the outer center prevention wall 81B (part 92a) in the width direction (direction perpendicular to the center line CL) to the side edge of the topsheet 2. The “width-direction central region” in the front region c is the distance between the pair of rear outer grooves 93 and 93 in the region sandwiched between a pair of front outer grooves 93 and 93, which will be described later, shown in FIG. A band-shaped region extending in the longitudinal direction (CL line direction) having a wide portion as a reference width. Similarly to the outer outer prevention wall 82B, the front outer prevention wall 82C is formed outward from the front center prevention wall 81C in the width direction (direction perpendicular to the center line CL) and to the side edge of the topsheet 2. ing.

  As shown in FIG. 3, the rear center prevention wall 81 </ b> B has a box shape that is long in the width direction (direction perpendicular to the center line CL). As shown in FIGS. 1 and 2, a box-shaped rear center prevention wall 81B is formed in the center region (CT) in the width direction of the sanitary napkin 1A and in the longitudinal direction (CL line direction) of the sanitary napkin 1A. It is intermittently arranged side by side. The same applies to the front center prevention wall 81C.

  The length of the rear center prevention wall 81B (the length in the direction perpendicular to the center line CL, the length of the portion 92a) is 5 mm to 65 mm, and the width of the rear center prevention wall 81 (parallel to the center line CL). The length in the direction is 1 mm to 10 mm. The same applies to the front center prevention wall 81C. The height of the rear central prevention wall 81B is preferably equal to or higher than the height of the rear outer prevention wall 82B. In the first embodiment, the height is higher than the height of the rear outer prevention wall 82B. 2 mm to 4 mm. Similarly, the height of the front central prevention wall 81C is preferably the same as or higher than the height of the front outer prevention wall 82C. In the first embodiment, the height is higher than the height of the front outer prevention wall 82C. 2 mm to 4 mm.

  In the first embodiment, each of the pair of rear outer prevention walls 82B and 82B is formed by a plurality of independent small convex portions 82a in the width direction (direction perpendicular to the center line CL) as shown in FIG. Is formed. The pair of outer outer prevention walls 82B and 82B are preferably formed by two to five small convex portions 82a, respectively, and in the first embodiment, each formed by three small convex portions 82a. Has been. As shown in FIG. 3, each small convex part 82a is substantially the same size, and the shape of the small convex part 82a is a box-like shape having a substantially square top surface. The same applies to the front outer prevention wall 82C.

  The length (length in the direction perpendicular to the center line CL) of each small convex portion 82a forming the rear outer prevention wall 82B is 1 mm to 10 mm, and the width of each small convex portion 82a (to the center line CL). The length in the parallel direction) is 1 mm to 10 mm. The height of each small convex portion 82a is 1 mm to 3 mm, which is lower than the height of the outer central prevention wall 81B in the first embodiment. The same applies to the front outer prevention wall 82C.

  Each of the pair of rear outer prevention walls 82B, 82B is not formed by a plurality of independent small convex portions 82a, and the width direction (direction perpendicular to the center line CL) is different from the rear center prevention wall 81B. ), The length of the rear center prevention wall 81B (the length in the direction perpendicular to the center line CL) is 5 to 30 mm. The width and height of the rear center prevention wall 81B are the same as the width and height of each small convex portion 82a. The same applies to the front outer prevention wall 82C.

  The outer central prevention wall 81B and the outer outer prevention wall 82B are formed discontinuously (see FIG. 4). Specifically, the small convex portion 82a1 closest to the center line CL in the three small convex portions 82a forming the outer outer prevention wall 82B and the outer central prevention wall 81B are arranged in the width direction (the center line CL As viewed from the vertical direction), they have overlapping portions and are formed discontinuously. Further, in the first embodiment, the three small convex portions 82a constituting the outer outer prevention wall 82B have overlapping portions when viewed from the width direction (direction perpendicular to the center line CL), The three small convex portions 82a are arranged in a so-called zigzag pattern and are formed discontinuously (see FIG. 4). The same applies to the front center prevention wall 81C and the front outer prevention wall 82C.

  The leak-proof wall 7 of the sanitary napkin 1A is preferably a loop-shaped or T-shaped leak-proof wall. In the first embodiment, as shown in FIGS. 7. Hereinafter, the loop-shaped leak-proof wall 7 will be described.

  In the sanitary napkin 1A of the first embodiment, as shown in FIGS. 1 and 3, the belt-like stretchable sheet 6 extends along the longitudinal direction on the side portion 5 a in the longitudinal direction (CL line direction) of the absorbent main body 5. Thus, due to the contraction of the stretchable sheet 6, a hollow loop-shaped leak-proof wall 7 that protrudes upward on the skin contact surface side is formed. Here, “standing” means a state in which the top of the hollow loop-shaped leak-proof wall 7 is located above the surface of the topsheet 2.

  In the first embodiment, the elastic sheet 6 includes a sheet material 61 on the skin contact surface side, a sheet material 62 on the non-skin contact surface side, and a space between the sheet materials 61 and 62, as shown in FIG. And a composite sheet formed by arranging a plurality of elastic members 63. The sheet material 61 on the skin contact surface side and the sheet material 62 on the non-skin contact surface side are strip-shaped (rectangular) sheets of the same shape and size, and the stretchable sheet 6 is on the skin contact surface side. Between the sheet material 61 and the sheet material 62 on the non-skin contact surface side, a thread-like elastic member 63 is formed in the longitudinal direction (CL line direction) of the sheet materials 61 and 62.

  The number of the elastic members 63 is preferably 4 to 10. As shown in FIG. 1, the plurality of elastic members 63 are arranged at least in the excretory region a in the longitudinal direction (CL line direction) of the sanitary napkin 1A. Each of the plurality of elastic members 63 is arranged in a stretched state at substantially equal intervals in the width direction (direction perpendicular to the CL line direction) of the strip-shaped sheet materials 61 and 62 to form the stretchable sheet 6.

  As shown in FIG. 3, the surface of the sheet material 61 on the skin contact surface side of the one side portion 6 a in the longitudinal direction of the stretchable sheet 6 is formed so that the stretchable sheet 6 sandwiches the topsheet 2 and the absorber 4. It is joined to the skin contact surface side of the topsheet 2 to form a joint 8a. The other side portion 6b in the longitudinal direction of the stretchable sheet 6 is disposed between the absorber 4 and the back sheet 3, and the surface of the sheet material 62 on the non-skin contact surface side of the other side portion 6b is the absorber. 4 is joined to the non-skin contact surface 4 to form a joint 8b. Moreover, the elastic sheet 6 has a part joined to the absorptive main body 5 in the front area | region c ahead of the excretion part area | region a and the back rear area | region b. Thus, since the belt-like stretchable sheet 6 is disposed and joined along the longitudinal direction on the side portion 5a in the longitudinal direction (CL line direction) of the absorbent main body 5, the stretchable sheet 6 contracts. Thereby, the leak-proof wall 7 which has the part which stood up in the shape of a hollow loop is formed. Each joining can be performed by heat sealing or an adhesive. In the first embodiment, the joint portion 8a is formed by heat sealing, and the sheet material 62 on the non-skin contact surface side of the stretchable sheet 6 and the absorbent body 4 are joined by an adhesive. Moreover, in 1st Embodiment, joining of the surface sheet 2 and the absorber 4 is performed by an adhesive agent, and joining (joining part) of the sheet | seat material 61 and the back surface sheet 3 of the skin contact surface side of the expansion-contraction sheet 6 is carried out. 8b) is performed by heat sealing.

  The composite sheet forming the loop-shaped leak-proof wall 7 has elastic members at the front and rear of the part of the leak-proof wall 7 standing in a loop shape, that is, behind the rear region b and front of the front region c. 63 is not disposed and the elastic sheet 6 is not formed. In the region where the elastic sheet 6 is not formed, or in the region where the elastic member 63 is disposed, the leak-proof wall 7 is not raised or the standing state is lowered. The liquid flow prevention wall 8 is preferably provided in a region where the leakage prevention wall 7 is not standing or a region where the standing state is lower than the liquid flow prevention wall 7. As shown in FIG. 1, the composite sheet forming the loop-shaped leak-proof wall 7 is formed in the longitudinal direction of the absorbent body 4 at both ends in the longitudinal direction of the sanitary napkin 1 </ b> A similarly to the top sheet 2 and the back sheet 3. It extends from both ends in the direction, and the extended portion is bonded and fixed by heat sealing or hot melt.

  As shown in FIGS. 1 and 3, the sanitary napkin 1 </ b> A of the first embodiment has a groove 9 that joins the absorbent body 4, the surface sheet 2, and the liquid flow prevention wall 8. In the groove, portions formed deeply and portions formed slightly shallower are alternately arranged to form a continuous line. The deep part of the groove is indicated by a solid black line in FIG. In the sanitary napkin 1A of the first embodiment, the groove 9 includes an excretory part outer groove 91 formed in the excretion part area a, a rear outer groove 92 formed behind the excretion part area a, and the front of the excretion part area a. The front outer grooves 93 are formed in the ring shape, and are connected to each other to form a ring-shaped all-round leakage preventing groove.

  As shown in FIG. 1, a pair of grooves 9 are provided symmetrically with respect to a center line (CL line) extending in the longitudinal direction of the sanitary napkin 1A. A pair of groove | channels 9 and 9 are each formed along the both sides 5a and 5a of the longitudinal direction (CL line direction) of the absorptive main body 5. FIG. As shown in FIG. 1, the grooves 9 and 9 of the sanitary napkin 1A according to the first embodiment have a pair of constricted portions 9a1 and 9a1 constricted inside the sanitary napkin 1A in the vicinity of the rear end of the excretory region a. And has a pair of constricted portions 9a2 and 9a2 constricted inside the sanitary napkin 1A in the vicinity of the front end portion of the excretory region a. The groove in the region sandwiched between the constricted portion 9a1 and the constricted portion 9a2 is the excretory portion outer groove 91, and the groove in the region rearward of the constricted portion 9a1 is the rear outer groove 92, which is more forward than the constricted portion 9a2. The groove in this area is the front outer groove 93.

  As shown in FIG. 1, a pair of excretory part outer grooves 91 are provided symmetrically with respect to a center line (CL line) extending in the longitudinal direction of the sanitary napkin 1A. The shape of each excretory part outer groove 91 is a curve that is convex in the width direction (direction orthogonal to the CL line direction), and is a curve with a curve radius r = 30 to 700.

  As shown in FIG. 1, a pair of rear outer grooves 92 are provided symmetrically about a center line (CL line) extending in the longitudinal direction of the sanitary napkin 1A. The shape of each rear outer groove 92 is a curved curve that is convex in the width direction (direction orthogonal to the CL line direction), and is a gentler curve than the convex shape of the excretory part outer groove 91. At a portion where the pair of rear outer grooves 92, 92 intersect, the rear outer groove 92 and the rear outer groove 92 intersect at an acute angle. As shown in FIG. 1, the front outer groove 93 is a gentler curve than the convex shape of the excretory part outer groove 91, as shown in FIG. 1, and in a portion where the pair of front outer grooves 93, 93 intersect. The front outer groove 93 and the front outer groove 93 intersect at an acute angle. The groove widths of the excretory part outer groove 91, the rear outer groove 92, and the front outer groove 93 are 1 mm to 4 mm, respectively.

In the first embodiment, the top sheet 2 has a large number of liquid introduction apertures 10 in the excretion region a as shown in FIG. The opening width of the liquid introduction hole 10 is 40 mm to 70 mm. The liquid introduction apertures 10 are formed at 10 pieces / cm ^{2 to} 20 pieces / cm ² .

  The rear end b1 of the absorbent main body 5 of the sanitary napkin 1A of the first embodiment is formed so as to extend to the tailbone of the wearer, and the back sheet 3 has a rear region b as shown in FIG. In this case, the width of the absorbent main body 5 extends from both side edges 5a and 5a in the longitudinal direction in the width direction (direction perpendicular to the CL line direction), and adheres to the inner surface (skin facing surface) of underwear such as shorts when worn. A fixed rear flap is formed.

A material for forming the sanitary napkin 1A according to the first embodiment will be described.
The back sheet 3 and the absorbent body 4 can be used without particular limitation as long as they are normally used for absorbent articles such as sanitary napkins. Examples of the back sheet 3 include leakproof materials such as a resin film, a resin film having fine holes, and a water-repellent nonwoven fabric. Examples of the absorbent body 4 include a structure in which a mixture of fluff pulp and superabsorbent polymer particles is covered with a tissue paper.

  The liquid flow prevention walls 8 (rear and front central prevention walls 81B and 81C, rear and front outer prevention walls 82B and 82C, and small protrusions 82a) are as in the first embodiment shown in FIGS. In the case of being formed from two sheets consisting of the top sheet 2 and another sheet 20 other than the top sheet 2, the top sheet 2 is usually used for absorbent articles such as sanitary napkins, It can use without a restriction | limiting especially, A various well-known nonwoven fabric can be used. For example, various nonwoven fabrics such as a nonwoven fabric, a spunbond nonwoven fabric, a meltblown nonwoven fabric, a spunlace nonwoven fabric, an air-through nonwoven fabric, a heat roll nonwoven fabric, and a needle punched nonwoven fabric manufactured by the card method can be used.

  When the liquid flow prevention wall 8 is formed of two sheets (the top sheet 2 and the separate sheet 20), the same sheet as the top sheet 2 can be used as the separate sheet 20, which will be described below. From the viewpoint of ease of shaping with the uneven roll, a sheet described in JP-A No. 2004-174234A or the like is preferably used.

  The stretchable sheet 6 that forms the loop-shaped leak-proof wall 7 has stretchability, and at least in the excretion part region a, while maintaining the loop shape in which the leak-proof wall 7 rises convexly toward the skin contact surface side. It is a rigid sheet that can be freely deformed without a sense of incompatibility.

The stretchable physical property of the stretchable sheet 6 is preferably 50 to 500 gf / 25 mm, more preferably 100 to 300 gf / 25 mm in width when stretched 5 to 50% in the longitudinal direction (CL line direction) of the sanitary napkin 1A. .
Further, the rigidity of the stretchable sheet 6 is preferably 5 to 200 gf, more preferably 10 to 100 gf in terms of bulk softness value. If the bulk softness value is less than 5 gf, the loop shape is too soft to be stable, and if it exceeds 200 gf, it is not preferable because it does not deform freely or becomes uncomfortable when worn.
Bulk softness can be measured as follows. That is, the elastic sheet is cut out as a strip having a size of 150 mm in the longitudinal direction and 30 mm in the width direction, and both ends of the strip in the longitudinal direction are overlapped with each other by 5 mm so as to form a cylindrical shape. Two places are fixed with staples at a position of about 10 mm from the upper and lower edges of the cylinder. Next, the sample is compressed with a Tensilon compression tester at a compression rate of 10 mm / min, and the maximum compressive strength until the cylinder buckles is measured. The average value of 5 measurements is taken as the bulk softness value.

  Examples of the sheet material of the stretchable sheet 6 include a stretchable film, a stretchable nonwoven fabric, a stretchable woven fabric, or a laminated sheet thereof. Specifically, the material itself made of natural rubber, polyurethane, polystyrene-polyisoprene copolymer, polystyrene-polybutadiene copolymer, polyethylene-α olefin copolymer such as polyethylene-ethyl acrylate, etc. is a material having elasticity. Alternatively, as in the first embodiment, there is a composite sheet in which an elastic member 63 in which these stretchable materials are thread-like is arranged between the sheet 61 on the skin contact surface side and the sheet 62 on the non-skin contact surface side. Can be mentioned. Examples of the shape of the thread-like elastic member 63 include a thread-like (thread rubber etc.) or string-like (flat rubber etc.) cross section having a rectangular, square, circular, polygonal cross section, or a multifilament type thread-like one. It is done.

  The sheet 61 on the skin contact surface side of the stretchable sheet 6 is preferably a thermoplastic nonwoven fabric made of polyethylene / polyester, polyethylene / polypropylene, or polypropylene in order to improve the touch. The same applies to the sheet 62 on the non-skin contact surface side. For such a thermoplastic nonwoven fabric, it is preferable to use fibers crimped so that the nonwoven fabric itself has stretchability. When using a non-crimped nonwoven fabric made of fibers that are not crimped for the sheet 61 on the skin contact surface side and the sheet 62 on the non-skin contact surface side, the elastic member 63 is stretched to a predetermined stretch ratio in advance, A composite sheet that becomes the stretchable sheet 6 is formed by arranging it at regular intervals between the sheet 61 on the skin contact surface side and the sheet 62 on the non-skin contact surface side, and bonding them by hot melt or heat sealing. You may create it. It is preferable that one or both of the sheet material 61 on the skin contact surface side and the sheet material 62 on the non-skin contact surface side is water-repellent or liquid-impermeable.

A method of forming the liquid flow prevention wall 8 (the rear and front central prevention walls 81B and 81C, the rear and front outer prevention walls 82B and 82C, and the small protrusions 82a) of the sanitary napkin 1A will be described. Since the liquid flow prevention wall 8 in the rear region b and the liquid flow prevention wall 8 in the front region c are the same, the liquid flow prevention wall 8 in the rear region b will be described below.
The liquid flow prevention wall 8 (rear center prevention wall 81B, rear outer prevention wall 82B, small convex portion 82a) can be formed from one sheet or two sheets, and in the first embodiment, 2 to 4, the liquid flow prevention wall 8 (rear center prevention wall 81B, rear outer prevention wall 82B, small convex portion 82a) is hollow. It has a shape. Specifically, the liquid flow prevention wall 8 (the rear center prevention wall 81B, the rear outer prevention wall 82B, and the small convex portion 82a) is composed of the top sheet 2 and the top sheet 2 as shown in FIGS. It is formed from another sheet 20 other than the above, and is formed by forming irregularities on the other sheet 20 with an uneven roll and bonding the sheet to the top sheet 2. The convex roll of the concavo-convex roll has a pair of rear outer prevention walls 82B (three small protrusions 82a) and a rear outer prevention wall 82B (three small protrusions 82a) in a direction perpendicular to the rotation direction of the rolls. ) And a convex mold that forms a rear center prevention wall 81B sandwiched between a pair of rear outer prevention walls 82B and 82B. A plurality of convex molds that form the liquid flow preventing walls 8 in the rotation direction of the roll. The concave roll of the concave / convex roll has a plurality of concave molds in a portion corresponding to the convex mold forming the liquid flow preventing wall 8. Another sheet 20 is carried in between such uneven rolls, and uneven shaping is applied to the separate sheet 20, and an adhesive is applied to the lower surface of the separate sheet 20 and attached to the top sheet 2. As shown, a liquid flow prevention wall 8 (a rear center prevention wall 81B, a rear outer prevention wall 82B, and a small convex portion 82a) having a hollow shape is formed.

  The liquid flow prevention wall 8 (rear center prevention wall 81B, rear outer prevention wall 82B, small convex portion 82a) is a convex shape of the convex roll of the concave and convex roll and a concave shape of the concave roll of the concave and convex roll. By adjusting the depth of the groove, it can be formed at an arbitrary height. In the first embodiment, as shown in FIGS. 3 and 4, the height of the rear central prevention wall 81B is higher than the height of the rear outer prevention wall 82B (three small convex portions 82a). Therefore, the height of the convex shape of the convex roll forming the rear center prevention wall 81B is higher than the height of the convex shape of the convex roll forming the rear side outer prevention wall 82B (three small convex portions 82a). The depth of the concave groove of the concave roll that forms the rear center prevention wall 81B is adjusted to be higher, and the concave groove of the concave roll that forms the rear outer prevention wall 82B (three small convex portions 82a). It is formed by adjusting deeper than the depth.

  The separate sheet 20 may be disposed on the upper surface of the surface sheet 2 only at least in the rear region b where the liquid flow prevention wall 8 is formed, and extends over the front and rear ends in the longitudinal direction (CL line direction) of the surface sheet 2. May be arranged. When the liquid flow prevention wall 8 is formed in the rear region b and the front region c as in the first embodiment, it may be disposed on the upper surface of the top sheet 2 in the rear region b and the front region c. .

  When the liquid flow prevention wall 8 (rear center prevention wall 81B, rear outer prevention wall 82B, small convex part 82a) is formed from one sheet, the surface is formed on a support (net) for forming a nonwoven fabric. After the webs to be the sheets 2 are stacked, the groove portion between the adjacent liquid flow prevention walls 8 and the liquid flow prevention walls 8 is sucked or gas is injected into the groove portions to form an uneven structure on the web. The manufacturing method which provides and heats it and forms the liquid flow prevention wall 8 can be considered. According to this manufacturing method, as shown in FIG. 5, the liquid flow prevention wall 8 (rear side central prevention wall 81B, rear side outer prevention wall 82B, small convex portion 82a) is a solid fiber assembly. The surface sheet 2 having a structure can be formed.

  Formation of the liquid introduction hole 10 of the top sheet 2 of the sanitary napkin 1A can be formed by pressing a number of perforation pins. In order to form the surface sheet 2 having a large number of liquid introduction apertures 10 in the excretion part region a, the excretion part region a should not be applied to the rear region b and the front region c of the surface sheet 2. A plurality of liquid introduction apertures 10 are formed. The liquid flow prevention wall 8 (rear center prevention wall 81B, rear outer prevention wall 82B, small convex portion 82a) is formed of two sheets, and another sheet 20 is formed in the longitudinal direction (CL In the case of being arranged over the front and rear ends in the (linear direction), after sticking the other sheet 20 subjected to uneven shaping on the top surface of the top sheet 2, press the perforation pins only to the excretion area a, The liquid introduction hole 10 penetrating the other sheet 20 and the top sheet 2 is formed. Further, when the separate sheet 20 is arranged on the upper surface of the top sheet 2 only in the rear region b and the front region c where the liquid flow prevention wall 8 is formed, the perforating pins are pressed against the top sheet 2 in advance, A liquid introduction hole 10 penetrating the top sheet 2 may be formed. Similarly, when the liquid flow prevention wall 8 (rear center prevention wall 81B, rear outer prevention wall 82B, small convex portion 82a) is formed from a single sheet, the excretion area of the topsheet 2 A perforation pin is pressed only at a to form a liquid introduction hole 10 penetrating the top sheet 2.

  A known embossing method can be used to form the grooves 9 (the excretory part outer groove 91, the rear outer groove 92, and the front outer groove 93) of the sanitary napkin 1A. For example, ultrasonic embossing and thermal embossing can be used. The grooves 9 are embossed from the top sheet 2 side to the back sheet 3 side after the top sheet 2 (see FIG. 4) having the liquid flow preventing wall 8 is arranged on the skin contact surface of the absorber 4. As shown in FIG. 2, the squeezing is performed until it is located below the surface of the absorbent body 4. By providing the groove 9, the top sheet 2, the liquid flow prevention wall 8 (separate sheet 20), and the absorber 4 are integrally fixed.

  Each of the pair of rear outer grooves 92 and 92 is formed by embossing between the rear center prevention wall 81B and the small convex portion 82a1 shown in FIG. 4, and the distance between the pair of rear outer grooves 92 and 92 is as follows. As it goes backward in the longitudinal direction of the sanitary napkin 1A, the sanitary napkin is gradually narrower than the widest portion 92a between the rear outer grooves 92, 92. Therefore, at the rear of the rear region b of the sanitary napkin 1A, the pair of rear outer grooves 92, 92 are formed so as to divide the rear center prevention wall 81B. The pair of front outer grooves 93, 93 is also formed so as to divide the front center prevention wall 81 </ b> C, similarly to the rear outer groove 92.

Next, the effect at the time of using the sanitary napkin 1A of embodiment of this invention mentioned above is demonstrated.
As shown in FIGS. 1 to 3, the sanitary napkin 1 </ b> A of the first embodiment is provided with a liquid flow prevention wall 8 extending in the width direction (direction perpendicular to the center line CL) on the upper surface of the rear region b. Therefore, even when sleeping in the supine state, no space is created between the wearer's skin and the sanitary napkin, and the flow of menstrual blood can be effectively prevented. Since a plurality of such liquid flow prevention walls 8 are intermittently arranged in the longitudinal direction (CL line direction), the sanitary napkin 1A of the first embodiment effectively transmits the flow backward. As a result, it is possible to effectively prevent the body fluid from leaking from behind, and to have excellent leakage prevention properties. Moreover, since the liquid flow prevention wall 8 of 1st Embodiment does not have the liquid introduction hole 10, it can dam the menstrual blood effectively.

  Further, as shown in FIG. 1, the sanitary napkin 1 </ b> A of the first embodiment is provided with a liquid flow prevention wall 8 extending in the width direction (direction perpendicular to the center line CL) also on the upper surface of the front region c. Therefore, even when sleeping in a prone state, no space is created between the wearer's skin and the sanitary napkin, and the flow of menstrual blood can be effectively prevented.

  In addition, the sanitary napkin 1A of the first embodiment has a liquid flow prevention wall in a region where the leakage prevention wall 7 is not standing in the rear region b or a region where the leakage prevention wall 7 is standing and lower than the liquid flow prevention wall 8. 8 is provided. In this way, if the liquid flow prevention wall 8 is provided in a region where the leakage prevention wall 7 is not standing or in a region where the leakage prevention wall 7 is standing but lower than the liquid flow prevention wall 8, the liquid flow prevention wall 8. The body fits well with the body and can prevent the backward flow of liquid.

  Further, as shown in FIGS. 1 and 4, the sanitary napkin 1 </ b> A according to the first embodiment includes a rear central prevention wall 81 </ b> B and a rear outer prevention wall 82 </ b> B that are discontinuously formed in the rear region b. Therefore, it is possible to prevent the spread of menstrual blood in the width direction (direction perpendicular to the center line CL), and as a result, effectively prevent the backward flow and the leakage of body fluid from the rear. And has excellent leak-proof properties. In the sanitary napkin 1A according to the first embodiment, as shown in FIGS. 1 and 4, a pair of rear outer prevention walls 82B are further formed of a plurality of independent small convex portions 82a, and the width direction ( Since the small convex portions 82a, 82a adjacent to each other in the direction perpendicular to the center line CL are formed discontinuously, further prevention of menstrual blood diffusion in the width direction (direction perpendicular to the center line CL) is further prevented. As a result, it is possible to more effectively prevent the backward flow and the leakage of body fluid from the rear, and have excellent leakage prevention properties. Similarly, the sanitary napkin 1A of the first embodiment also has the front center prevention wall 81C and the front outer prevention wall 82C in the front region c, so that the forward flow and the front The body fluid can be effectively prevented from leaking and has excellent leakage prevention properties.

  Further, as shown in FIGS. 1, 3 and 4, the sanitary napkin 1A according to the first embodiment is such that the rear and front central prevention walls 81B and 81C have the rear and front outer prevention walls 82B. , 82C higher than the height. In particular, since the rear center prevention wall 81B is formed in the center region (CT) in the width direction, it easily enters a crack in the wearer's buttocks and further creates a space between the wearer's skin and the sanitary napkin. It is difficult to effectively prevent menstrual blood flow.

  Moreover, as for the sanitary napkin 1A of 1st Embodiment, as shown in FIG.3 and FIG.4, the liquid flow prevention wall 8 has a hollow shape. Therefore, since menstrual blood can be accumulated until it is absorbed by the absorber 4, a large amount of menstrual blood can be blocked, effectively preventing backward flow and leakage of body fluid from the rear. Can be prevented.

  Moreover, since the surface sheet 2 of the sanitary napkin 1A of the first embodiment has the liquid introduction hole 10 in the excretion part region a as shown in FIGS. The dammed menstrual blood can be quickly absorbed by the absorbent body 4. For this reason, it is possible to more effectively prevent the backward flow and the leakage of bodily fluid from the rear, and have excellent leakage prevention properties.

Next, a sanitary napkin according to a second embodiment of the present invention will be described with reference to FIG.
About the sanitary napkin 1B of 2nd Embodiment, a different point from the sanitary napkin 1A of 1st Embodiment is demonstrated. The points that are not particularly described are similar to the sanitary napkin 1A of the first embodiment, and the description of the sanitary napkin 1A of the first embodiment is applied as appropriate.

  As shown in FIG. 9, the top sheet 2 of the sanitary napkin 1 </ b> B of the second embodiment covers the entire upper surface of the absorbent body 4 and covers the side edges of the absorbent body 4, and is wound on the back sheet 3 side. Yes. The back sheet 3 covers the lower surface of the absorber 4. The top sheet 2 and the back sheet 3 extend from both ends b1 and c1 in the longitudinal direction (CL line direction) of the sanitary napkin 1B from both ends in the longitudinal direction (CL line direction) of the absorbent body 4 and extend. The parts are joined together by heat sealing or the like to form the absorbent main body 5. As shown in FIG. 9, the liquid flow prevention wall 8 (rear side central prevention wall 81B, rear side outer prevention wall 82B, small convex part 82a) of the sanitary napkin 1B of the second embodiment is located above the absorber 4. Is formed. The sanitary napkin 1B of the second embodiment includes a pair of leak-proof walls 7 'and 7' that are located on both sides of the skin contact surface side and extend in the longitudinal direction. As shown in FIG. 9, the leak-proof wall 7 'of the sanitary napkin 1B of the second embodiment is a T-shaped leak-proof wall. Hereinafter, the T-shaped leak-proof wall 7 'will be described.

  As shown in FIG. 9, the T-shaped leak-proof wall 7 ′ is formed by processing a single strip-shaped sheet 6 ′ into a sleeve shape and a T shape. The sheet 6 'is preferably a thermoplastic nonwoven fabric made of polyethylene / polyester, polyethylene / polypropylene, or polypropylene in order to improve the touch. The T-shaped leak-proof wall 7 'includes a base wall 7a, and the base wall 7a has a fixed end and a free end in a free state.

  As shown in FIG. 9, the T-shaped leak-proof wall 7 ′ includes a planar projecting portion 7 b that projects substantially horizontally from the free end. In the wearing state of the sanitary napkin 1A, the upper surface of the overhang portion 7b comes into contact with the skin of the wearer. As shown in FIG. 9, the overhanging portion 7b includes an inward overhanging portion 71b and an outward overhanging portion 72b that protrude inward and outward in the width direction of the sanitary napkin 1A with the same amount of overhang. ing. The overhang of the overhang portion 7b extends over the entire longitudinal direction (CL line direction) of the sanitary napkin 1A.

  As shown in FIG. 9, a plurality of elastic members 63 extending in the longitudinal direction (CL line direction) of the leak-proof wall 7 are stretched in each of the inwardly projecting portion 71b and the outwardly projecting portion 72b of the overhang 7b. Therefore, the sheet 6 'is provided with stretchability by being spaced apart in the width direction (direction orthogonal to the CL line direction). The elastic member 63 is not disposed behind the rear region b and in front of the front region c, and the belt-like sheet 6 ′ does not have elasticity. In the region where the sheet 6 ′ is not stretchable, or in the region where the elastic member 63 is disposed but is not stretched, the leakage preventing wall 7 ′ does not stand up, and this leakage preventing wall It is preferable that the liquid flow preventing wall 8 is provided in a region where 7 'does not stand up.

  As shown in FIG. 9, the fixed end of the T-shaped leak-proof wall 7 ′ is provided at an inner position at a predetermined distance from the side edge of the absorber 4. Specifically, the fixed end of the T-shaped leak-proof wall 7 ′ is disposed between the top sheet 2 and the back sheet 3 extending to the non-skin contact surface side of the absorber 4, and heat sealing or The sanitary napkin 1B of the second embodiment can be joined by an adhesive or the like, and is joined by an adhesive.

  Next, the effect at the time of using the sanitary napkin 1B of 2nd Embodiment of this invention mentioned above is demonstrated. The sanitary napkin 1B of the second embodiment has the same effect as the sanitary napkin 1A of the first embodiment. Hereinafter, effects different from the sanitary napkin 1A of the first embodiment will be described.

  As shown in FIG. 9, the sanitary napkin 1B according to the second embodiment of the present invention includes the T-shaped leak-proof wall 7 ′, so that the T-shaped leak-proof wall 7 ′ is erected. Leakage hardly occurs because it follows the movement of the body in an area. In particular, since the liquid flow prevention wall 8 is provided in a region where the T-shaped leak-proof wall 7 ′ is not standing or in a region where the T-shaped leakage prevention wall 7 ′ is standing but lower than the liquid flow prevention wall 8, the first Similar to the embodiment, the fit with the body is good and the prevention of the backward liquid flow can be enhanced.

  The absorbent article of the present invention is not limited to the sanitary napkins 1A and 1B of the first or second embodiment described above, and can be appropriately changed. Moreover, each component in sanitary napkin 1A, 1B of 1st or 2nd embodiment can be implemented suitably combining in the range which does not impair the meaning of this invention.

  For example, in the sanitary napkin 1A, 1B of the first or second embodiment described above, the rear side and front side central prevention walls 81B, 81C are arranged in the width direction (on the center line CL as shown in FIGS. 3 and 9). Although it is a single box-like shape that is long in the vertical direction), it may be formed of a plurality of independent small convex portions like the rear and front outer prevention walls 82B and 82C. Moreover, those small convex parts may be arranged in a so-called staggered pattern. Each of the pair of rear and front outer prevention walls 82B and 82C is formed by a plurality of independent small convex portions 82a as shown in FIGS. 3 and 9, but the rear center prevention shown in FIG. A single box-like shape that is long in the width direction (direction perpendicular to the center line CL) may be used like the wall 81B. That is, the rear and front central prevention walls 81B and 81C and the rear and front outer prevention walls 82B and 82C may have one box shape, a plurality of independent small convex portions, and a combination thereof.

  Further, in the sanitary napkin 1A of the first embodiment described above, the plurality of independent small convex portions 82a are arranged in a so-called zigzag shape as shown in FIG. 4, but as shown in FIG. , And may be continuously arranged in the width direction (direction perpendicular to the center line CL). In that case, from the viewpoint of preventing the spread of menstrual blood in the width direction (direction perpendicular to the center line CL), as shown in FIG. 6, the rear and front center prevention walls 81B and 81C, the small convex portion 82a, Are arranged so as to be discontinuous. In addition, as shown in FIGS. 3 and 4, the small convex portions 82 a have substantially the same size, but may not be the same.

  Further, in the sanitary napkin 1A of the first embodiment described above, the height of the rear front center prevention wall 81B is substantially the same as shown in FIG. 2, but as shown in FIG. The heights of the rear center prevention walls 81B, 81B adjacent to each other in the (CL line direction) may be alternately staggered, and may be formed alternately. As shown in FIG. In order to prevent it effectively, the height of the rear center prevention wall 81B may be gradually increased as going to the rear end b1 of the sanitary napkin 1A. Similarly, the height of the front center prevention wall 81C may be gradually increased toward the front end c1 of the sanitary napkin 1A. Further, as shown in FIG. 2, the plurality of liquid flow prevention walls 8 are provided at substantially equal intervals in the longitudinal direction (CL line direction) of the sanitary napkin 1A. Good. The same applies to the rear and front outer prevention walls 82B and 82C.

  The excretory part outer groove 91, the rear outer groove 92, and the front outer groove 93 that constitute the groove 9 are all formed in a convex curved shape, but may be formed in a convex bent line shape.

  In addition to sanitary napkins, the absorbent article of the present invention can be suitably used for, for example, incontinence pads, panty liners, disposable diapers and the like.

It is a perspective view of the sanitary napkin which is 1st Embodiment of this invention. It is the Y1-Y1 sectional view taken on the line of the sanitary napkin shown in FIG. It is the X1-X1 sectional view taken on the line of the sanitary napkin shown in FIG. It is a perspective view of the surface sheet used for the sanitary napkin shown in FIG. It is a perspective view of the surface sheet used for the sanitary napkin of other embodiment of this invention. It is a perspective view of the surface sheet used for the sanitary napkin of further another embodiment of this invention. It is the Y1-Y1 sectional view taken on the line of the sanitary napkin of other embodiment of this invention. It is the Y1-Y1 sectional view taken on the line of the sanitary napkin of further another embodiment of this invention. It is the X1-X1 sectional view taken on the line of the sanitary napkin which is 2nd Embodiment of this invention.

Explanation of symbols

DESCRIPTION OF SYMBOLS 1 Sanitary napkin 2 Top sheet 3 Back sheet 31 Wing part 4 Absorbent body 5 Absorbent main body 5a, 5a Both sides of longitudinal direction of absorbent main body 6 Elastic sheet 6 'sheet 61 Skin contact surface side sheet 62 Non-skin Seat 63 on the contact surface side Elastic member 6a One side part 6b Other side parts 7, 7 'Leakage prevention wall 7a Base wall part 7b Overhang part 71b Inward overhang part 72b Outward overhang part 8 Liquid flow prevention wall 81B Rear center Prevention wall, 81C Front center prevention wall 82B Rear outer prevention wall, 82C Front outer prevention wall 82a Small convex portion 9 Groove 9a1, 9a2 Constricted portion 91 Excretion portion outer groove 92 Rear outer groove 93 Front outer groove 10 Liquid opening Hole 20 Another sheet

Claims (7)

A vertically long absorbent article comprising a top sheet formed on the skin contact surface side, a back sheet formed on the non-skin contact surface side, and an absorber interposed between both sheets,
In the surface sheet, a plurality of liquid flow prevention walls extending in the width direction are intermittently juxtaposed in the longitudinal direction of the absorbent article in the rear region of the excretion part region in contact with the body fluid excretion part of the wearer. Has been established,
The top sheet of the rear region, wherein the liquid flow prevention wall in the rear region has a rear central prevention wall and a rear outer prevention wall formed outward in the width direction from the rear central prevention wall. However, the absorptive article formed by this back center prevention wall, this back outside prevention wall, and a groove which divides them. In the front sheet, a plurality of liquid flow prevention walls extending in the width direction are intermittently juxtaposed in the longitudinal direction of the absorbent article in the front region of the excretory part region,
The liquid flow prevention wall in the front region has a front central prevention wall and a front outer prevention wall formed outward in the width direction from the front central prevention wall, and the top sheet in the front region includes the front sheet An absorbent article comprising a front central prevention wall, the front outer prevention wall, and a groove partitioning them.   The absorbent article according to claim 1 or 2, wherein each of the rear outer prevention wall or the front outer prevention wall is formed by a plurality of independent small convex portions.   The absorbent article according to any one of claims 1 to 3, wherein a height of the rear central prevention wall or the front central prevention wall is higher than a height of the rear outer prevention wall or the front outer prevention wall. .   The absorbent article according to any one of claims 1 to 4, wherein the liquid flow prevention wall is formed of two sheets, and the liquid flow prevention wall has a hollow shape.   The absorptive article according to any one of claims 1 to 5 in which said surface sheet in said excretion part field has many liquid introduction openings.   The both sides of the absorbent article on the skin contact surface side are respectively provided with a pair of leak-proof walls extending in the longitudinal direction of the absorbent article, and the leak-proof walls in the rear area and / or the front area. The absorbent article according to any one of claims 1 to 6, wherein the liquid flow prevention wall is provided in a region where the liquid does not stand.

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