JP2003000638A - Disposable wear - Google Patents

Abstract

PROBLEM TO BE SOLVED: To provide a disposable wear whose pocket designed between a surface sheet and a leakage-proof sheet can easily be opened from its opening. SOLUTION: A disposable wear 1 whose liquid absorption core 4 exists between a liquid penetration surface sheet 2 and a liquid no-penetration back sheet 3 wherein a leakage-proof sheet 14 extending toward the body surrounding is fixed with the front and rear surrounding areas 5 and 7, where the leakage- proof sheet 14 is provided with a fixed end portion 14a, a fixed bilateral end portion 14b and a free end portion 14c, while an elastic material 18 is fixed with a solid edge 14a in an extended state, and an elastic material 19 is fixed in the neighborhood of an inner edge 14d of the free end 14c in an extended state, while the pocket that opens toward an area from the front and rear surroundings of the body, 5 and 7 to an inseam area 6 is designed between the surface sheet 2 and the free end 14c of the leakage-proof sheet 14.

Description

Detailed Description of the Invention

[0001]

BACKGROUND OF THE INVENTION 1. Field of the Invention The present invention relates to a disposable wearing article that absorbs and retains excrement.

[0002]

2. Description of the Related Art Japanese Patent Laid-Open No. 2000-140004 discloses
A liquid-permeable topsheet located on the skin contact side, a liquid-impermeable backsheet located on the skin non-contact side, and a liquid-absorbent core interposed between the front and backsheets. Region and a rear waist region, and a crotch region located between the waist regions, and a liquid-impervious leakproof sheet extending in the waist direction is attached to the rear waist region and extends in the waist direction. Disclosed is a disposable diaper in which a foam member is interposed between a topsheet and a leakproof sheet.

The leak-proof sheet has a fixed end extending in the waist-circumferential direction at the end of the rear waist region, fixed fixed side parts extending in the longitudinal direction outside the side edges of the core, and in the crotch region more than the fixed end. And a free end extending in the waist-circumferential direction at a position offset to the side. The foamed member is bent at a bending shaft located on the fixed end side of the leak-proof sheet, and first and second portions thereof extend from the bending shaft toward the crotch region. In the foam member, the first
A portion is fixed to the outer surface of the topsheet and a second portion is fixed to the inner surface of the free end of the leakproof sheet.

In this diaper, a pocket opening from the rear waist region to the crotch region is defined between the surface sheet and the leak-proof sheet, and the first and second portions of the foam member are separated from each other. By doing so, the pocket has the effect of opening its mouth.

[0005]

In the diaper disclosed in the above publication, when worn, the first and second portions of the foam member are curved in the girth direction so as to be convex toward the non-skin contact side. . In this diaper, when the first and second portions are curved, the portions cannot be separated from each other, and conversely, the first portion and the second portion may approach each other and the mouth of the pocket may be closed. . Further, in this diaper, when the diaper is worn, the foamed member is bulky and feels uncomfortable.

An object of the present invention is to dispose a pocket defined between a surface sheet and a leak-proof sheet without using a foam member so that the mouth of the pocket can be easily opened so that there is no discomfort when worn. To provide a worn article.

[0007]

The premise of the present invention for solving the above-mentioned problems comprises a front waist region and a rear waist region facing each other, and a crotch region located between these waist regions. , A liquid-permeable top sheet located on the skin contact side, a liquid-impermeable back sheet located on the skin non-contact side, and the front and back sheets interposed between the crotch region and the front and rear waist regions Composed of a liquid-absorbent core extending toward the outer surface of the surface sheet, and a substantially liquid-impervious leak-proof sheet extending in the waistline direction on the outer surface of the front waistband and the rear waistband. A disposable wearing article attached to at least one of them.

The features of the present invention based on the above premise are as follows.
The leak-proof sheet extends vertically in the vicinity of the edge of the core located in the waist region in the waist circumference direction, and in the longitudinal direction outside the side edges of the core located in the waist region. The first stretchable elastic member extending in the girth direction has a fixed side part and a free end part that extends in the girth direction from a position offset from the fixed end to the crotch region side, and the first stretchable elastic member extends in the girth direction. A second stretchable elastic member that is attached to the end portion in an extended state and extends in the girth direction is attached to the free end portion in an extended state near an inner end edge located on the side of the crotch region, and The elastic member bends in the waist circumference 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, and the free end of the leak-proof sheet is , Away from the outer surface of the topsheet due to contraction of the second elastic member Pocket opening toward from the waist region to said crotch region is in that it is defined between the topsheet and the leakage preventing free end of the sheet.

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 0.05 to 1 N.
/ 25 mm range, the core of JIS P 812
The bending resistance according to No. 5 is in the range of 0.2 to 0.02 N · cm.

[0010]

BEST MODE FOR CARRYING OUT THE INVENTION The details of the disposable wearing article according to the present invention will be described below with reference to the accompanying drawings, using a pants-type disposable diaper as an example.

1 and 2 are a partially cutaway perspective view of a disposable diaper 1 and a partially cutaway perspective view of the diaper 1 shown in a state before being molded into a pants type. 1 and 2, the waistline direction is indicated by arrow X, the vertical direction is indicated by arrow Y1, and the leg direction is indicated by arrow Y2. The inner surfaces of the topsheet 2 and the backsheet 3 are surfaces facing the core 4, and the outer surfaces of the sheets 2 and 3 are surfaces not facing the core 4.

The diaper 1 comprises a liquid-permeable topsheet 2 located on the skin contact side, a liquid-impermeable backsheet 3 located on the skin non-contact side, and an absorbent layer interposed between the sheets 2 and 3. It is composed of a liquid core 4. The diaper 1 has a front waist region 5 and a rear waist region 7 facing each other, and a crotch region 6 located between the waist regions 5 and 7. Diaper 1
Is a girth end 8 extending in the front and rear girth regions 5, 7 in the girth direction, a girth side part 9 extending in the front and back girth regions 5, 7 in the longitudinal direction, and a crotch part 6 extending in the leg girth direction. Leg side 10
Have and.

In the diaper 1, the waist circumference side portions 9 are overlapped in a palm shape, and the waist circumference side portions 9 are fixed to each other through a large number of heat-sealing wires 11 which are arranged intermittently in the longitudinal direction. In diaper 1,
A waist opening 12 and a pair of leg openings 13 are defined below the waist opening 12. As shown in FIG. 2, in the diaper 1, the leg side portions 10 form an arc inwardly in the waist circumferential direction, and the planar shape thereof is a substantially hourglass.

The core 4 extends toward the front and rear waist regions 5, 7 centering on the crotch region 6, and is located at the front and rear waist regions 5, 7 and has both end edges 4a parallel to the waist region end 8 and a body. It has both side edges 4b parallel to the side portion 9 and the leg side portion 10.
The core 4 is bonded to the inner surface of at least one of the topsheet 2 and the backsheet 3.

A substantially liquid-impervious leakproof sheet 14 is attached to the front and rear waist regions 5, 7 so as to extend in the waist direction on the outer surface of the topsheet 2. A substantially liquid-impervious leakproof cuff 15 extending on the outer surface of the topsheet 2 in the leg-surrounding direction is attached to the leg-side portion 10.

A plurality of waist elastic members 16 extending in the waist direction are attached to the waist end portion 8 in a stretched state. A plurality of leg elastic members 17 extending in the leg circumferential direction are attached to the leg peripheral side portion 10 in an extended state.

The leak-proof sheet 14 has a fixed end portion 14a extending in the waist-circumferential direction near the inner side of both end edges 4a of the core 4 and the waist-surrounding end portion 8 and fixed side portions extending in the longitudinal direction in the waist-surrounding side portion 9. 14b and a free end portion 14c extending in the waist-surrounding direction from a position offset from the fixed end portion 14a toward the crotch region 6 side.
A plurality of stretchable elastic members 18 (first stretchable elastic members) extending in the girth direction are attached to the fixed end portion 14a in a stretched state. A plurality of stretchable elastic members 19 (second stretchable elastic members) extending in the girth direction are attached in a stretched state in the vicinity of the inner end edge 14d located on the crotch region 6 side of the free end portion 14c. .

The leak-proof cuff 15 has a fixed edge portion 15a extending outside the both side edges 4b of the core 4 in the leg circumference direction and a fixed edge portion 1a.
A free edge portion 15b extending in the direction around the leg in parallel with 5a,
It has fixed end portions 15c which are located in the front and rear waist regions 5 and 7 and lie inward in the waist direction of the diaper 1. The fixed both ends 15c are interposed between the topsheet 2 and the leakproof sheet 14. In the leakproof cuff 15, a side portion 15d extends laterally outward from the fixed edge portion 15a. A stretchable elastic member 20 extending in the leg circumference direction is attached to the free edge portion 15b in an extended state. The elastic member 20 has a free edge portion 15.
It is coated on part of b.

In order to form the underpants-type diaper 1 from the state shown in FIG. 2, the diaper 1 is placed so that the topsheet 2 is on the inside.
Is bent at the center line L and the waist side portions 9 of the front and rear waist regions 5, 7 are superposed in a palm shape, and the waist side portions 9 are fixed to connect the front and rear waist regions 5, 7.

In the diaper 1, the elastic member 18 extending to the fixed end portion 14a of the leak-proof sheet 14 contracts inward in the waist circumference direction, so that the elastic member 18 resists the rigidity of the core 4 and the core 4.
The vicinity of the edge 4a is curved in the waistline direction so as to be convex toward the non-skin contact side. Further, in the diaper 1, the elastic member 19 extending to the free end portion 14c of the leakproof sheet 14 contracts inward in the waist circumference direction, and the free end portion 14c of the leakproof sheet 14 is separated from the outer surface of the topsheet 2. .

Between the surface sheet 2 and the free end portion 14c of the leak-proof sheet 14, a pocket P opening from the front and rear waist regions 5, 7 to the crotch region 6 is defined. In the diaper 1, since the elastic member 18 bends the vicinity of the edge 4a of the core 4 in the waist circumference direction, the elastic member 19 easily contracts inward in the waist circumference direction, and the pocket P can easily open its mouth. You can

In the diaper 1, even if the excrement diffuses on the surface sheet 2 and reaches the waist circumference end portion 8, since the waste matter is accommodated in the pocket P, the waste matter discharged from the waist circumference end portion 8 is accommodated. Leakage can be prevented. The diaper 1 does not use a foam member to open the mouth of the pocket P as compared with that of the conventional technique, and therefore, there is no discomfort when the diaper 1 is worn.

In the diaper 1, when the crotch region 6 bends in the leg-surrounding direction with the surface sheet 2 inside, the elastic member 20 extending to the free edge portion 15b of the leak-proof cuff 15 contracts inward in the leg-surrounding direction. The free edge portion 15 b of the leakproof cuff 15 stands up from the outer surface of the topsheet 2. In the diaper 1, since the free edge portion 15b forms a barrier against excrement, it is possible to prevent the excrement from leaking from the side portions 10 around the leg.

In the diaper 1, the elastic member 18 has a tensile stress in the range of 0.2 to 2 N / 25 mm, the elastic member 19 has a tensile stress in the range of 0.05 to 1 N / 25 mm, and the core 4 of JIS P 8125 ( The bending resistance by the bending test under load) is in the range of 0.2 to 0.02 N · cm. When the bending resistance of the core 4 exceeds 0.2 Ncm and the extension stress of the elastic member 18 is less than 0.2 N / 25 mm, the rigidity of the core 4 causes the elastic member 18 to move inward in the waist circumference direction. Can not contract, the edge 4 of the core 4
It is not possible to curve in the girth direction so that the vicinity of a is convex toward the non-skin contact side. When the extension 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, many irregular wrinkles are formed on the core 4 and the excrement absorption of the core 4 is performed. The function will deteriorate. When the extension stress of the elastic member 19 is less than 0.05 / 25 mm, the free end portion 14c of the leak-proof sheet 14 may be attached to the topsheet 2.
Cannot be separated from the outer surface of.

3 and 4 are a sectional view taken along the line AA of FIG. 2 and a sectional view taken along the line BB of FIG. 2, and FIG. 5 is shown in FIG.
It is a CC line end view of FIG. At the waist-surrounding end portion 8, the end portion 2a of the topsheet 2 and the end portion 3a of the backsheet 3 extend in the longitudinal direction outward from both end edges 4a of the core 4, and the sheets 2, 3
The end portions 2a and 3a of the are fixed in a state of overlapping each other.

In the waist-side portion 9 and the leg-side portion 10, the side portion 2b of the topsheet 2 extends outward from the side edges 4b of the core 4 in the waistline direction, and further extends from the side portion 2b of the topsheet 2. Circumferentially outwardly, the side portion 3b of the back sheet 3 and the leak-proof cuff 15
And the side portion 15d of the. In the waist-surrounding side portion 9 and the leg-surrounding side portion 10, the side portion 2 of the topsheet 2 and the backsheet 3 is formed.
b and 3b are fixed in a state where they overlap each other,
Side portions 3b and 15d of the back sheet 3 and the leakproof cuff 15 are fixed to each other in an overlapping state.

The fixed edge portion 15a of the leakproof cuff 15 is fixed to the outer surface of the side portion 2b of the topsheet 2. Leak prevention cuff 15
The fixed both ends 15c are fixed to the outer surface of the end 2a of the topsheet 2. The waist elastic member 16 is interposed between the end portion 2a and the end portion 3a and fixed to the end portions 2a and 3a. The leg elastic members 17 are interposed between the side portions 3b and 15d and fixed to the side portions 3b and 15d.

The leak-proof sheet 14 is a double sheet which is bent at its inner edge 14d and overlaps each other. The fixed end portion 14a of the leak-proof sheet 14 is fixed to the outer surface of the end portion 2a of the topsheet 2 and the fixed end portions 15c and side portions 15d of the leak-proof cuff 15.
It is fixed to and. Fixed both sides 14 of the leakproof sheet 14
The b is fixed to the side portion 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 to them.

For fixing the elastic members 16, 17, 18, and 19 to the front and back sheets 2 and 3, the leak-proof sheet 14, and the cuff 15, it is preferable to use a hot-melt adhesive. Seats 2, 3, 14 and cuff 15 and elastic members 16, 1
For fixing to 7, 18, and 19 with a hot-melt type adhesive, a pattern in which the adhesive is applied in a spiral shape or a spray shape can be appropriately selected. However, the elastic member 1
6, 17, 18, 19 sheets 2, 3, 14 and cuff 15
In order to firmly adhere to the elastic member, the coating area ratio of the adhesive with respect to the total surface area of the elastic member is preferably in the range of 20 to 80%. If the coating area ratio of the adhesive is less than 20%, the elastic members 16, 17, 18, 19 may come off from the sheets 2, 3, 14 and the cuff 15. When the coating area ratio of the adhesive exceeds 80%, the elastic members 16, 17, 18, 1
The shrinkage of 9 is hindered by the adhesive.

As the topsheet 2, a hydrophilic or hydrophobic fibrous nonwoven fabric or a plastic film having a large number of fine holes can be used. Back sheet 3
The leak-proof sheet 14, the leak-proof cuff 15 have a hydrophobic fiber nonwoven fabric, a breathable liquid-impermeable plastic film, a composite nonwoven fabric obtained by stacking hydrophobic fiber nonwoven fabrics, a hydrophobic fiber nonwoven fabric and a breathable liquid-impermeable plastic. Any of the composite sheets laminated with the film can be used.

The backsheet 3, the leakproof sheet 14, and the leakproof cuff 15 are sandwiched by a fiber nonwoven fabric having a high water resistance by the melt blown method with a fiber nonwoven fabric having a high strength and flexibility by the spunbond method. It is also possible to use a composite non-woven fabric.

As the non-woven fabric, a non-woven fabric manufactured by a spun lace, needle punch, melt blown, thermal bond, spun pond, chemical bond or air through process can be used. As the constituent fibers of the non-woven fabric, polyolefin-based fibers, polyester-based fibers, polyamide-based fibers, core / sheath composite fibers or side-by-side composite fibers made of polyethylene / polypropylene or polyester can be used.

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. In order to prevent the core 4 from losing its shape and the polymer particles from falling off, it is preferable that the entire core 4 is covered with and joined to a tissue paper. As the polymer particles, starch-based, cellulose-based, and synthetic polymer-based particles can be used.

The front and back sheets 2 and 3 are fixed to each other, the core 4 is joined, and the leak-proof sheet 14 and the leak-proof cuff 15 are fixed to each other by hot-melt adhesive or heat such as heat seal or sonic seal. Welding means can be used.

In the diaper 1, the leak-proof sheet 14 may be attached to at least one of the front and rear waist regions 5, 7. The present invention can be applied to an open type disposable diaper as well as the pants type disposable diaper 1.

[0036]

According to the disposable wearing article of the present invention, the second stretchable elastic member extending to the free end portion of the leakproof sheet contracts inward in the girth direction to thereby free the leakproof sheet. An end is spaced from the outer surface of the topsheet, and a pocket is defined between the topsheet and the free end of the leakproof sheet, the pocket opening from the waist region to the crotch region. In this wearing article, the first stretchable elastic member extending to the fixed end portion of the leak-proof sheet is directed toward the non-skin contact side in the girth direction so as to be convex toward the non-skin contact side in the vicinity of the edge of the core against the rigidity of the core. Since the second elastic member is bent inward, the second elastic member is likely to contract inward in the waist circumference direction, and the pocket can easily open its mouth.

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 the waste leaks from the waist opening edge. Can be prevented. In this wearing article, compared to that of the prior art, since the foaming member is not used to open the mouth of the pocket, there is no discomfort when the article is worn.

[Brief description of drawings]

FIG. 1 is a partially cutaway perspective view of a disposable diaper.

FIG. 2 is a partially cutaway perspective view of the diaper shown in a state where the diaper is unfolded to the front and rear.

3 is a sectional view taken along the line AA of FIG.

FIG. 4 is a sectional view taken along the line BB of FIG.

5 is an end view taken along line CC of FIG.

[Explanation of symbols]

1 Pants-type disposable diaper (disposable wearing article) 2 Liquid-permeable top sheet 3 Liquid-impermeable back sheet 4 Liquid-absorbent core 4a Edges 4b Both side edges 5 Front waist region 6 Inseam region 7 Rear waist region 14 Prevention Leakage sheet 14a Fixed end 14b Fixed both sides 14c Free end 14d Inner edge 18 Stretchable elastic member (first stretchable elastic member) 19 Stretchable elastic member (second stretchable elastic member) P Pocket

   ─────────────────────────────────────────────────── ─── Continued front page    (72) Inventor Kenji Nakamura             1531-7 Wadahama Takasuka, Toyohama Town, Mitoyo District, Kagawa Prefecture               Unicharm Corporation Technical Sen             Inside (72) Inventor Joji Shimizu             1531-7 Wadahama Takasuka, Toyohama Town, Mitoyo District, Kagawa Prefecture               Unicharm Corporation Technical Sen             Inside F term (reference) 3B029 BC01 BD10 BD13 BF07                 4C098 AA09 CC10 CC12 CC15 CE06                       DD03 DD10 DD12 DD23 DD24                       DD25 DD26 DD28 DD30

Claims (2)

[Claims] 1. A liquid-permeable surface sheet located on the skin contact side, comprising a front waist region and a back waist region facing each other, and a crotch region located between the waist regions, and a non-skin A liquid-impervious back sheet located on the contact side, and a liquid-absorbent core extending from the crotch region toward the front and rear waist regions by being interposed between the front and back sheets, the top sheet In the disposable wearing article, wherein the substantially liquid-impervious leakproof sheet extending on the outer surface in the waistline direction is attached to at least one of the front waistband and the rear waistband, the leakproof sheet. However, a fixed end portion extending in the waist circumference direction in the vicinity of the end edge of the core located in the waist area, and fixed side portions extending in the vertical direction outside the both side edges of the core located in the waist area. , The position offset from the fixed end to the side of the crotch region A first stretchable elastic member extending in the waistline direction, the first stretchable elastic member extending in the waistline direction being attached to the fixed end in an extended state, and the second stretchable elastic member extending in the waistline direction. A member is attached in a stretched state near an inner edge of the free end located on the side of the crotch region, and the first elastic member resists the rigidity of the core and near the edge of the core. The free end of the leak-proof sheet is separated from the outer surface of the topsheet by the contraction of the second elastic member, and is curved so as to be convex toward the non-skin contact side. The wearing article, wherein a pocket opening from a peripheral region toward the crotch region is defined between the surface sheet and a free end portion of the leak-proof sheet. 2. The extension stress of the first elastic member is 0.2.
˜2 N / 25 mm, the extension stress of the second elastic member is in the range of 0.05 to 1 N / 25 mm, and the core has a bending resistance of 0.2 to 0.0 according to JIS P 8125.
The wearing article according to claim 1, which is in a range of 2 N · cm.