JP3926585B2 - Disposable wearing items - Google Patents

Description

[0001]
BACKGROUND OF THE INVENTION
The present invention relates to a disposable wearing article that absorbs and holds excrement.
[0002]
[Prior art]
Japanese Patent Application Laid-Open No. 2000-140004 discloses a liquid-absorbing surface sheet positioned on the skin contact side, a liquid-impervious back sheet positioned on the skin non-contact side, and a liquid-absorbing property interposed between the front and back sheets. A liquid-impervious leak-proof sheet that includes a core, includes a front waistline region and a back waistline region, and a crotch region positioned between the waistline regions, and extends in the waistline direction. Discloses a disposable diaper in which a foam member attached to the body and extending in the circumferential direction is interposed between a top sheet and a leak-proof sheet.
[0003]
The leak-proof sheet is biased toward the crotch region rather than the fixed end, the fixed end portion extending in the waist direction, the fixed end portion extending in the longitudinal direction outside the side edge of the core, and the leakproof sheet. And a free end portion extending in the circumferential direction. The foamed member is bent at a bending shaft located on the fixed end portion side of the leak-proof sheet, and the first portion and the second portion extend from the bending shaft toward the crotch region. In the foamed member, the first portion is fixed to the outer surface of the topsheet, and the second portion is fixed to the inner surface of the free end portion of the leak-proof sheet.
[0004]
In this diaper, a pocket opening from the rear waist area to the crotch area is defined between the top sheet and the leak-proof sheet, and the first part and the second part of the foam member are about to be separated from each other. The pocket has the effect of opening its mouth.
[0005]
[Problems to be solved by the invention]
In the diaper disclosed in the above publication, when worn, the first and second portions of the foamed member are curved in the circumferential direction so as to be convex toward the non-skin contact side. In this diaper, when the first and second parts are curved, the parts cannot be separated from each other, and conversely, the first part and the second part may be close to each other and the pocket mouth may be closed. . In this diaper, when the diaper is worn, the foamed member is bulky and uncomfortable.
[0006]
An object of the present invention is to provide a disposable wearing article in which a pocket defined between a surface sheet and a leak-proof sheet can easily open its mouth without using a foaming member, and there is no sense of incongruity during wearing. It is to provide.
[0007]
[Means for Solving the Problems]
The premise of the present invention to solve the above problems is that the front waist region and the back waist region that face each other, and the crotch region located between the waist regions, the transparent region located on the skin contact side. A liquid surface sheet, a liquid-impermeable back sheet positioned on the non-skin contact side, and a liquid-absorbent core extending between the crotch region and the front-rear waist region interposed between the front and back sheets And a substantially liquid-impervious leak-proof sheet extending in the circumferential direction on the outer surface of the top sheet is provided in at least one waist area of the front waist area and the rear waist area . It is an attached disposable wearing article.
[0008]
As a feature of the present invention based on the above premise, the leak-proof sheet is fixed so as to extend inside the edge of the core located in the at least one waist area and the waist edge of the worn article in the waist direction. Ends, fixed both side portions extending in the vertical direction on the outer sides of both side edges of the core located in the waist circumference region, and freedom extending in the waist circumference direction from the fixed end portion toward the crotch region side and a end portion, the first elastic member extending in the waist direction, attached under tension to the fixed end, the second elastic member extending in the waist direction, the said free end portion The first elastic member is attached in an extended state near the inner edge located on the crotch region side, and the first elastic member protrudes toward the non-skin contact side near the edge of the core against the rigidity of the core. Curved in the direction around the trunk so that A pocket that is spaced from the outer surface of the topsheet by shrinkage of the second elastic member and that opens from the waistline region toward the crotch region is a free end portion of the topsheet and the leakproof sheet. It is defined in between.
[0009]
As an example of an embodiment of the present invention, the extension stress of the first elastic member is in the range of 0.2 to 2 N / 25 mm, and the extension stress of the second elastic member is in the range of 0.05 to 1 N / 25 mm. The bending resistance of the core according to JIS P 8125 is in the range of 0.2 to 0.02 N · cm.
[0010]
DETAILED DESCRIPTION OF THE INVENTION
The details of the disposable wearing article according to the present invention will be described with reference to the accompanying drawings, taking a pants-type disposable diaper as an example.
[0011]
1 and 2 are a partially broken perspective view of the disposable diaper 1 and a partially broken perspective view of the diaper 1 shown in a state before being formed into a pants mold. 1 and 2, the waist direction is indicated by an arrow X, the vertical direction is indicated by an arrow Y1, and the leg periphery direction is indicated by an arrow Y2. The inner surface of the top sheet 2 and the back sheet 3 refers to the surface facing the core 4, and the outer surface of the sheets 2 and 3 refers to the surface not facing the core 4.
[0012]
The diaper 1 includes a liquid-permeable surface sheet 2 positioned on the skin contact side, a liquid-impermeable back sheet 3 positioned on the skin non-contact side, and a liquid-absorbent core interposed between the sheets 2 and 3. 4. The diaper 1 has a front waistline region 5 and a back waistline region 7 that face each other, and a crotch region 6 that is positioned between the waistline regions 5 and 7. The diaper 1 includes a waistline end portion 8 extending in the waistline direction in the front and back waistline regions 5 and 7, a waistline side portion 9 extending in the longitudinal direction in the front and back waistline regions 5 and 7, and a crotch region 6 in the legwise direction. And a leg-circumferential side portion 10 extending to the side.
[0013]
In the diaper 1, the waistline side portion 9 overlaps with a palm, and the waistline side portion 9 is fixed through a large number of heat-sealing wires 11 that are intermittently arranged in the vertical direction. In the diaper 1, a waist opening 12 and a pair of leg openings 13 are defined below. As shown in FIG. 2, the diaper 1 has a leg-circumferential side portion 10 that forms an arc inwardly in the trunk-circumferential direction, and the planar shape thereof has a substantially hourglass shape.
[0014]
The core 4 extends toward the front and rear waist regions 5 and 7 with the crotch region 6 as a center, and is located in the front and back waist regions 5 and 7 and has both end edges 4a parallel to the waist portion 8; 9 and both side edges 4b parallel to the leg periphery side portion 10. The core 4 is bonded to at least one inner surface of the top sheet 2 and the back sheet 3.
[0015]
A substantially liquid-impervious leak-proof sheet 14 is attached to the front and rear waist regions 5 and 7 and extends from the outer surface of the top sheet 2 to the waist direction. A substantially liquid-impervious leak-proof cuff 15 that extends on the outer surface of the topsheet 2 in the leg-surrounding direction is attached to the leg-surrounding side portion 10.
[0016]
A plurality of waistline elastic members 16 extending in the waistline direction are attached to the waistline end portion 8 in an expanded state. A plurality of leg-around elastic members 17 extending in the leg-circumference direction are attached to the leg-surrounding side portion 10 in an extended state.
[0017]
Barrier sheets 14 has a fixed end portion 14a extending inner side and waist end 8 of the opposite ends 4a of the core 4 in the waist-circumferential direction, a fixed side portions 14b extending waist side 9 in the longitudinal direction, fixed It has a free end portion 14c extending from the end portion 14a toward the crotch region 6 in the direction around the waist. The fixed end portion 14a is elastic members 18 (first elastic member) of plural rows extending in the waist-circumferential direction are attached in a stretched state. The inner edge 14d near which is located on the side of the crotch region 6 of the free end 14c, [elastic member 19 of plural rows extending in the waist direction (second elastic member) is attached in a stretched state 0018 ]
The leak-proof cuff 15 includes a fixed edge 15a that extends outside the side edges 4b of the core 4 in the direction around the leg, a free edge 15b that extends in the direction around the leg in parallel to the fixed edge 15a, and a front and rear waist area 5 , 7 and fixed both end portions 15c lying inwardly in the trunk direction of the diaper 1. The fixed both end portions 15 c are interposed between the top sheet 2 and the leak-proof sheet 14. In the leak-proof cuff 15, a side portion 15d extends laterally outward from the fixed edge portion 15a. The free edge 15b, the elastic member 20 Ru extending the leg-encircling direction are attached in a stretched state. The elastic member 20 is covered by a part of the free edge 15b.
[0019]
In order to form the pants-type diaper 1 from the state of FIG. 2, the diaper 1 is bent at the center line L so that the topsheet 2 is inside, and the waistline side portions 9 of the front and rear waistline regions 5, 7. Are overlapped in a palm-like shape, and the waistline side portion 9 is fixed to connect the front and rear waistline regions 5 and 7.
[0020]
In the diaper 1, the elastic member 18 extending to the fixed end portion 14 a of the leak-proof sheet 14 contracts inwardly in the waistline direction, and the elastic member 18 resists the rigidity of the core 4 in the vicinity of the edge 4 a of the core 4. It is curved in the direction of the waist so as to be convex toward the non-skin contact side. Furthermore, in the diaper 1, the elastic member 19 extending to the free end portion 14 c of the leak-proof sheet 14 contracts inwardly in the trunk direction, and the free end portion 14 c of the leak-proof sheet 14 is separated from the outer surface of the topsheet 2. .
[0021]
Between the top sheet 2 and the free end portion 14 c of the leak-proof sheet 14, a pocket P that opens from the front and rear waist regions 5 and 7 toward the crotch region 6 is defined. In the diaper 1, since the elastic member 18 curves the vicinity of the edge 4a of the core 4 in the waist direction, the elastic member 19 is easily contracted inward in the waist direction, and the pocket P can easily open its mouth. Can do.
[0022]
In the diaper 1, even if excrement diffuses on the top sheet 2 and reaches the waistline end 8, since the waste is accommodated in the pocket P, it prevents leakage of the waste from the waistline end 8. be able to. Compared to that of the prior art, the diaper 1 does not use a foamed member to open the mouth of the pocket P, so there is no sense of incongruity when the diaper 1 is worn.
[0023]
In the diaper 1, when the crotch region 6 is curved in the leg-surrounding direction with the topsheet 2 inside, the elastic member 20 extending to the free edge 15 b of the leak-proof cuff 15 contracts inward in the leg-surrounding direction, A free edge portion 15 b of the cuff 15 rises from the outer surface of the top sheet 2. In the diaper 1, since the free edge 15b forms a barrier against excrement, it is possible to prevent the excrement from leaking from the leg periphery side part 10.
[0024]
In the diaper 1, the extension stress of the elastic member 18 is in the range of 0.2 to 2 N / 25 mm, the extension stress of the elastic member 19 is in the range of 0.05 to 1 N / 25 mm, and JIS P 8125 of the core 4 (load bending method) The stiffness according to the stiffness test method) is in the range of 0.2 to 0.02 N · cm. When the bending resistance of the core 4 exceeds 0.2 N · cm and the elongation stress of the elastic member 18 is less than 0.2 N / 25 mm, the elastic member 18 moves inward in the waist direction due to the rigidity of the core 4. It cannot shrink and cannot bend in the circumference direction so that the vicinity of the edge 4a of the core 4 is convex toward the non-skin contact side. When the elongation stress of the elastic member 18 exceeds 2 N / 25 mm and the bending resistance of the core 4 is less than 0.02 N · cm, a large number of irregular folds are formed in the core 4 and the core 4 absorbs excrement. Function will be reduced. When the elongation stress of the elastic member 19 is less than 0.05 / 25 mm, the free end portion 14 c of the leak-proof sheet 14 cannot be separated from the outer surface of the topsheet 2.
[0025]
3 and 4 are a sectional view taken along line AA in FIG. 2 and a sectional view taken along line BB in FIG. 2, and FIG. 5 is an end view taken along line CC in FIG. At the waist end 8, the end 2 a of the top sheet 2 and the end 3 a of the back sheet 3 extend outward in the longitudinal direction from both end edges 4 a of the core 4, and the ends 2 a, 3 a of the sheets 2, 3 are connected to each other. Are fixed in an overlapping state.
[0026]
At the waistline side portion 9 and the leg periphery side portion 10, the side portion 2 b of the surface sheet 2 extends outward from the side edges 4 b of the core 4 in the waistline direction, and further outward from the sideline 2 b of the surface sheet 2 in the waistline direction. The side part 3b of the back sheet 3 and the side part 15d of the leak-proof cuff 15 extend in the direction. At the trunk periphery side portion 9 and the leg periphery side portion 10, the side portions 2 b and 3 b of the topsheet 2 and the backsheet 3 are fixed to each other so as to overlap each other, and the side portions of the backsheet 3 and the leak-proof cuff 15 are secured. 3b and 15d are fixed so as to overlap each other.
[0027]
The fixed edge portion 15 a of the leak-proof cuff 15 is fixed to the outer surface of the side portion 2 b of the topsheet 2. The fixed both end portions 15 c of the leak-proof cuff 15 are fixed to the outer surface of the end portion 2 a of the topsheet 2. The waist elastic member 16 is interposed between the end 2a and the end 3a, and is fixed to the ends 2a and 3a. The leg-around elastic member 17 is interposed between the side portion 3b and the side portion 15d, and is fixed to the side portions 3b and 15d.
[0028]
The leak-proof sheet 14 is a double one that is folded at the inner edge 14d and overlaps each other. The fixed end portion 14 a of the leak-proof sheet 14 is fixed to the outer surface of the end portion 2 a of the topsheet 2 and the fixed both end portions 15 c and the side portions 15 d of the leak-proof cuff 15. The fixed both side portions 14b of the leak-proof sheet 14 are fixed to the side portions 15d of the leak-proof cuff 15 located in the front and rear waist regions 5,7. The elastic members 18 and 19 are interposed between the leak-proof sheets 15 and fixed thereto.
[0029]
For fixing the elastic members 16, 17, 18, 19 to the front and back sheets 2, 3, the leak-proof sheet 14, and the cuff 15, it is preferable to use a hot melt adhesive. For fixing the sheets 2, 3, 14 or cuff 15 and the elastic members 16, 17, 18, 19 with a hot-melt adhesive, a pattern in which the adhesive is applied in a spiral or spray form can be selected as appropriate. . However, in order to securely fix the elastic members 16, 17, 18, and 19 to the sheets 2, 3, 14, and the cuff 15, the adhesive coating area ratio with respect to the total surface area of the elastic member is in the range of 20 to 80%. Preferably there is. If the adhesive coating area ratio is less than 20%, the elastic members 16, 17, 18, and 19 may be detached from the sheets 2, 3, 14, and the cuff 15. When the application area ratio of the adhesive exceeds 80%, the shrinkage of the elastic members 16, 17, 18, and 19 is hindered by the adhesive.
[0030]
For the topsheet 2, a hydrophilic or hydrophobic fiber nonwoven fabric or a plastic film having a large number of fine openings can be used. For the back sheet 3, the leak-proof sheet 14, and the leak-proof cuff 15, a hydrophobic fiber nonwoven fabric, a breathable liquid-impervious plastic film, a composite nonwoven fabric in which a hydrophobic fiber nonwoven fabric is laminated, a hydrophobic fiber nonwoven fabric and a breathable liquid-impervious liquid Any of the composite sheets on which the plastic film is laminated can be used.
[0031]
A composite nonwoven fabric in which a back surface sheet 3, a leakage prevention sheet 14, and a leakage prevention cuff 15 are sandwiched by a fiber nonwoven fabric having a high water resistance by a melt blown method and a fiber nonwoven fabric by a spunbond method having high strength and high flexibility. Can also be used.
[0032]
As a nonwoven fabric, what was manufactured by each manufacturing method of a spunlace, a needle punch, a melt blown, a thermal bond, a spun pond, a chemical bond, and an air through can be used. As the constituent fibers of the nonwoven fabric, polyolefin-based, polyester-based, polyamide-based fibers, core-sheath type composite fibers or parallel type composite fibers made of polyethylene / polypropylene or polyester can be used.
[0033]
The core 4 is a mixture of fluff pulp and superabsorbent polymer particles, or a mixture of fluff pulp, superabsorbent polymer particles and thermoplastic synthetic resin fibers, and is compressed to a required thickness. The core 4 is preferably covered and bonded to a tissue paper as a whole in order to prevent its shape loss and dropping of the polymer particles. As the polymer particles, starch-based, cellulose-based or synthetic polymer-based particles can be used.
[0034]
For fixing the front and back sheets 2 and 3, joining the core 4, and fixing the leak-proof sheet 14 and the leak-proof cuff 15, adhesion by a hot melt adhesive or welding means by heat such as heat seal or sonic seal is used. Can be used.
[0035]
In the diaper 1, the leak-proof sheet 14 may be attached to at least one of the front and rear waist regions 5 and 7. The present invention can be applied to an open-type disposable diaper in addition to the pants-type disposable diaper 1.
[0036]
【The invention's effect】
According to a disposable wearing article according to the present invention, the second elastic member extending in the free end portion of the leak-barrier sheet that shrinks toward the waist inwardly, the free end portion of the leak-barrier sheet is the topsheet A pocket that is spaced apart from the outer surface and opens from the waist area toward the crotch area is defined between the top sheet and the free end of the leak-proof sheet. In this wearing article, the waist-surrounding direction as the first elastic member extending in the fixed end portion of the leak-barrier sheet is convex in Ko' the rigidity of the core toward the edge near the core to the non-skin contact side Since the second elastic member is curved, the second elastic member easily contracts inward in the waist direction, and the pocket can easily open its mouth.
[0037]
In this wearing article, even if the excrement diffuses on the top sheet and reaches the waist opening edge, the waste is stored in the pocket, so that leakage of the waste from the waist opening edge is prevented. Can do. Compared to that of the prior art, this wearing article does not use a foamed member to open the mouth of the pocket, so there is no sense of incongruity when the article is worn.
[Brief description of the drawings]
FIG. 1 is a partially broken perspective view of a disposable diaper.
FIG. 2 is a partially broken perspective view of a diaper shown in a state where it is unfolded back and forth.
3 is a cross-sectional view taken along line AA in FIG.
4 is a cross-sectional view taken along line BB in FIG.
FIG. 5 is an end view taken along the line CC in FIG. 2;
[Explanation of symbols]
1 Pants-type disposable diapers (disposable wearing articles)
2 Liquid-permeable surface sheet 3 Liquid-impermeable back sheet 4 Liquid-absorbent core 4a Edge 4b Both-side edge 5 Front waist area 6 Inseam area 7 Rear waist area 14 Leakproof sheet 14a Fixed end 14b Fixed both sides 14c the free end 14d inner edge 18 elastic member (first elastic member)
19 elastic member (second elastic member)
P pocket

Claims (2)

The front waist area and the back waist area facing each other, and a crotch area positioned between the waist areas, a liquid-permeable surface sheet located on the skin contact side, and a position on the skin non-contact side Liquid impervious back sheet, and a liquid absorbent core interposed between the front and back sheets and extending from the crotch region toward the front / rear waist region, the outer surface of the top sheet being in the waist direction barrier sheets of substantially liquid-impervious extending found in disposable wearing article which is attached to at least one of the waist regions of said rear waist region and the front waist region,
The leak-proof sheet is positioned in the waist area, a fixed end extending in the waist circumference direction inside the edge of the core located in the at least one waist area and the waist edge of the wearing article. Fixed both side portions extending in the vertical direction outside the both side edges of the core, and a free end portion extending from the fixed end portion toward the crotch region in the waist direction.
The first elastic member extending in the waist direction, attached under tension to the fixed end, the second elastic member extending in the waist direction, positioned on the side of the crotch region of the free end portion It is attached in an extended state near the inner edge,
The first elastic member bends in the circumferential direction so that the vicinity of the edge of the core is convex toward the non-skin contact side against the rigidity of the core, so that the leakage preventing sheet is free. An end portion is separated from the outer surface of the topsheet by contraction of the second elastic member, and a pocket that opens from the waistline region toward the crotch region includes the topsheet and the free end portion of the leakproof sheet. The wearing article is defined between the two. The extension stress of the first elastic member is in a range of 0.2 to 2 N / 25 mm, the extension stress of the second elastic member is in a range of 0.05 to 1 N / 25 mm, and the core is rigid according to JIS P 8125. The wearing article according to claim 1, wherein the softness is in a range of 0.2 to 0.02 N · cm.

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