JP3663764B2 - Disposable diapers - Google Patents

Description

[0001]
BACKGROUND OF THE INVENTION
The present invention relates to a disposable diaper. More specifically, the present invention relates to a disposable diaper that avoids direct contact of the excrement of the wearer with the skin, prevents back leakage and abdominal leakage from the disposable diaper, improves absorption capacity, and improves discomfort during wearing. .
[0002]
[Prior art and issues]
The basic structure of a conventional disposable diaper is a three-layer structure in which an absorber is disposed between a liquid-permeable top sheet and a liquid-impermeable back sheet. In some cases, a water-permeable sheet is placed between the top sheet and the absorbent body.
[0003]
One problem with conventional disposable diapers is that when the excrement is highly viscous or large in volume, the liquid permeability of the top sheet is not sufficient, the excrement flows and spreads on the top sheet, and the wearer In the prone state, it oozes out from around the waist of the abdomen surface, and in the supine state, it oozes out from around the waist of the back, causing leakage. In addition, even if there is no leakage at the time of excretion of the wearer, when the disposable diaper is replaced, the wearer lies on his back and the excrement remaining on the top sheet takes the wearer's weight, spreading the excrement and back There may be leaks from around the waist. In addition, the wearer's skin is contaminated extensively, which may cause discomfort to the wearer and may cause skin irritation in the case of infants.
[0004]
Many proposals have been made so far for preventing leakage from the waist around the back of these disposable diapers and reducing wearer discomfort. For example, a sheet in which holes are further provided on a top sheet (Japanese Patent Laid-Open Nos. 3-218951, 3-202057, 5-49658, and 5-277149) ), A waist flap is further provided on the surface sheet of the waist (Japanese Utility Model Laid-Open No. 62-182910, Japanese Patent Laid-Open No. 64-26701, Japanese Patent Laid-Open No. 3-136653, Japanese Patent Laid-Open No. 3-195556, Kaihei 5-35121), the waist flap is joined to the crotch three-dimensional gather, and the whole waist flap is lifted from the top sheet (Japanese Patent Laid-Open No. 63-182402), the top sheet itself is lifted A pocket-like shape is formed, and the absorbent body comes out on the wearer contact surface because the topsheet has a U-shaped opening (Japanese Patent Laid-Open No. -300543), and the surface sheet is also lifted to form a pocket-like shape and has an opening, but the absorber does not directly contact the wearer (Japanese Patent Laid-Open No. 4-102452). .
[0005]
However, the proposal to prevent leakage from the back or abdominal surface of the excrement by using a leak-proof wall provided around the waist of these disposable diapers or the entire circumference of the absorber is effective even if the excrement leaks from the waist. Even if it can be prevented, excrement that has not been absorbed on the top sheet remains, so that the excrement flows on the top sheet and spreads, and the wearer's skin is extensively soiled. This can cause discomfort to the wearer and may cause skin irritation in infants. There is also a possibility of leakage when changing disposable diapers. On the other hand, in the proposal to raise the top sheet itself to form a pocket shape and provide an opening, leakage can be prevented if excrement is secured in the pocket space from the opening, but in the case of one opening, it is worn Depending on the person's wearing state, the amount of excrement, and the viscosity, the excrement cannot always be secured in the pocket-shaped space from the opening. In such a case, the excrement flows and spreads on the top sheet, and the skin of the wearer may not only be contaminated extensively but also leakage may occur. In addition, when the opening is greatly cut out, there is a high possibility that excrement is secured in the pocket-shaped space from the opening, but the absorbent body directly contacts the wearer's skin, so Deterioration, kinking of the absorber itself, loss of shape, and polymer leakage may occur.
[0006]
Also, as a method for preventing lateral leakage, absorbent articles (Japanese Patent Laid-Open No. 62-250201, Japanese Patent Laid-Open No. 3-131253) are disclosed in which a three-dimensional gather is arranged along the longitudinal direction of the absorbent article. Yes. However, these disposable diapers can prevent lateral leakage, but cannot prevent leakage from the dorsoventral direction, and there is a problem that the excrement is highly viscous or leaks from the dorsoventral portion of the disposable diaper when the amount is large. there were. Moreover, even if it does not leak, the excrement spreads on the top sheet, and the wearer's skin is soiled extensively, giving the wearer discomfort, and in the case of an infant, it causes skin irritation.
[Problems to be solved by the invention]
[0007]
In the conventional disposable diaper shown above, since the excrement flows and spreads on the surface sheet simply by preventing the excrement from leaking around the waist with a physical breakwater, the skin of the wearer is spread over a wide area. It was fouling and uncomfortable to the wearer, and in the case of infants, there were problems that caused skin irritation. In addition, those having means for transferring excrement from the surface sheet to the absorber by providing an opening in the surface sheet, the transition means is not sufficient, or the wearer's touch, the absorber itself, Some had problems such as shape loss and polymer leakage.
[0008]
The purpose of the present invention is not only to prevent leakage of excrement on the topsheet from the waist around the wearer's wearing state, but also to not leave excrement on the topsheet by moving the excrement. The entire surface on the side in contact with the wearer is covered with a sheet to improve the touch, and the absorbent body itself does not distort, lose shape, leak polymer, and form a three-dimensional gather along both longitudinal edges of the disposable diaper. By doing, it is providing the disposable diaper which prevents the leakage of a horizontal direction.
[0009]
[Means for Solving the Problems]
The present invention relates to a disposable diaper in which an absorbent body is disposed between a liquid-permeable top sheet and a liquid-impermeable back sheet, wherein the top sheet is a plurality of sheets arranged in a direction perpendicular to the longitudinal direction of the disposable diaper. The plurality of sheets have side edges located on the outer side centered on the portion in contact with the buttocks of the disposable diaper, and are bonded to the surface of the absorber, and the side edges located on the inner side. Are spaced apart from the absorber surface to form free edges, and the free edges form ridges and a large number of openings in the overlapping portions of the adjacent sheets. And the three-dimensional gather is formed along the longitudinal direction both sides edge part of a disposable diaper, It is a disposable diaper characterized by the above-mentioned.
[0010]
The disposable diaper according to the present invention prevents the flow of excrement by forming a cocoon by stacking a plurality of sheets arranged in a direction orthogonal to the longitudinal direction centering on a part in contact with the heel part of the disposable diaper. The problem of leakage from is solved. Further, by having a large number of openings, the excrement can be quickly transferred to the absorber regardless of the wearing state of the wearer, the amount and viscosity of the excrement. Therefore, excrement flows on the surface sheet and spreads, and the wearer's skin is not stained in a wide range, and the wearer is uncomfortable and does not cause an infant's skin irritation. In addition, there is no possibility of leakage when changing disposable diapers. On the other hand, since the absorbent body is covered with the surface sheet, there is no problem of the touch of the wearer, the kinking of the absorbent body itself, shape loss, and polymer leakage. Further, by arranging the three-dimensional gathers along the both side edges in the longitudinal direction of the disposable diaper, it is possible to enhance the prevention of leakage in the lateral direction.
[0011]
DETAILED DESCRIPTION OF THE INVENTION
The surface sheet used in the present invention is a hydrophilic or hydrophobic nonwoven fabric, woven fabric, porous plastic film or the like, and its constituent fibers are polypropylene, polyethylene, polyester, nylon, or polyester, polypropylene, polyethylene, A composite fiber composed of two or more components such as nylon may be used. Particularly, a composite fiber of polyester / polyester, polyester / polyethylene, or polypropylene / polyethylene is preferable from the viewpoint of strength, but is not particularly limited. Moreover, the nonwoven fabric made from the material which gathered together using the heat-shrinkable fiber and provided the elastic shrinkage can also be used.
[0012]
The absorbent body used is made from known absorbent materials commonly used in conventional disposable diapers and other absorbent articles. That is, it is formed from a single-layer or multi-layer mat made of absorbent fibers such as cotton-like pulp and rayon, and is further wrapped with a hydrophilic sheet. The superabsorbent polymer is uniformly mixed in each mat or disposed in layers between the mats. Alternatively, 3-60% by weight of a heat-fusible substance may be mixed and thermocompression bonded to the cotton-like pulp.
The cotton-like pulp is one having a fiber length of 5 mm or less obtained by defibrating a chemical pulp sheet, a mechanical pulp sheet or a used paper pulp sheet with a pulverizer. Pulp raw materials are not limited to conifers, but hardwoods, straw, bamboo, kenaf, and the like are also applicable. The amount of the pulp used varies depending on the intended absorber, for example, whether it is used singly, stacked in plural, or used in combination with other absorbents. Generally, it is 50 to 400 g / m ² .
[0013]
Examples of the superabsorbent polymer include starch, cellulose, and synthetic polymer. That is, starch-acrylic acid (salt) graft copolymer, saponified starch-ethyl acrylate graft copolymer, saponified starch-methyl methacrylate graft copolymer, saponified starch-acrylonitrile graft copolymer , Saponified starch-acrylamide graft copolymer, saponified starch-acrylonitrile-2-acrylamide-2-methylpropanesulfonic acid graft copolymer, acrylic acid (salt) polymer, poly cross-linked with acrylic acid Examples thereof include a crosslinked product of ethylene oxide, sodium carboxymethyl cellulose, and a crosslinked product of a polyvinyl alcohol-maleic anhydride reaction product. It absorbs urine, body fluid and water more than 20 times its own weight, and sodium polyacrylate is most suitable from the viewpoint of absorption performance. The superabsorbent polymer is used in an amount of 10 to 500 parts by weight, preferably 15 to 300 parts by weight, based on 100 parts by weight of the dry cotton-like pulp. Uniformly distributed. When the superabsorbent polymer absorbs and swells, the particles have minimal mutual interference and are less likely to come into continuous contact and form a permeation barrier, allowing urine and body fluids to penetrate and absorb in three dimensions. .
[0014]
The hydrophilic sheet may be a hydrophilic sheet such as tissue, absorbent paper, and hydrophilic nonwoven fabric.
As a compression method of the absorbent body, a continuous surface shape may be used so that the density of the absorbent body is substantially uniform over the entire surface by a roll having a smooth circumferential surface, or the circumferential surface is uneven. It may be embossed in a pattern arrangement in which the density of the absorber is partially different depending on the roll and guides urine and body fluid in the vertical and diagonal directions. In the case of embossing, the compression part and the non-compression part may be either continuous or discontinuous.
[0015]
The diffusion layer is a hydrophilic liquid-permeable nonwoven fabric, woven fabric, cotton-like pulp, etc., and its constituent components may be polypropylene, polyethylene, polyester, rayon, pulp, or composite fibers thereof, and are not particularly limited. Absent. The diffusion layer is disposed between the top sheet and the absorber, and is adhesively fixed to both or one of the absorber and the top sheet with an adhesive or the like. The diffusion layer used preferably has a basis weight of 8 to 200 g / m ² and a thickness of 0.2 to 5 mm.
[0016]
The three-dimensional gather used in the present invention is formed of a three-dimensional gather sheet and a stretchable elastic body.
The material for the three-dimensional gathering sheet is a hydrophilic or hydrophobic nonwoven fabric, woven fabric, porous plastic film or the like, or a liquid-impermeable film, or a combination thereof. The constituent fibers of the woven fabric and the nonwoven fabric are polypropylene, It may be a composite fiber composed of two or more components such as polyethylene, polyester, nylon or polyester, polypropylene, polyethylene, nylon, etc. In particular, a composite fiber of polyester / polyester, polyester / polyethylene, polypropylene / polyethylene is desirable from the viewpoint of strength. Not particularly restricted.
[0017]
As for the free edges, leg circumferences and waist circumferences of the surface sheet, and the elastic elastic bodies to be arranged, natural rubber, synthetic rubber, urethane or other thread-like, string-like or flat-shaped ones are used depending on the installation position. The arrangement of the elastic member is fixed to the sheet with an adhesive.
[0018]
As the back sheet to be used, a liquid-impermeable polyethylene sheet, preferably a polyethylene sheet having fine pores, or a moisture-permeable liquid-impermeable sheet stretched by adding a filler to a thermoplastic resin is used.
[0019]
In the present invention, the surface sheets such as the surface sheet and the absorber or the center surface sheet and the side surface sheet are bonded by hot melt bonding or the like. The adhesive surface is formed entirely or partially on the absorbent body, and the surface sheets are bonded together at the peripheral portion of the absorbent article or the overlapping portion of the central surface sheet and the side surface sheet. The adhesive may be starch-based or water-soluble glue such as CMC (carboxymethylcellulose) or an adhesive with high fluidity.
As described above, the disposable diaper of the present invention is composed of a plurality of sheets arranged in a direction orthogonal to the longitudinal direction centering on the portion where the top sheet is in contact with the excretion part of the disposable diaper, and adjacent sheets overlap each other. A part is formed with a ridge and a large number of openings, and a three-dimensional gather is formed along both side edges in the longitudinal direction. The effect of the present invention can be achieved only with a disposable diaper having such a configuration. Become.
[0020]
【Example】
Hereinafter, the disposable diaper of this invention is demonstrated in detail with drawing.
What is shown in FIG. 1 is a partially cutaway developed plan view of a disposable diaper. In the disposable diaper in FIG. 1, an absorbent body 3 is disposed between a liquid-permeable top sheet 1 and a liquid-impermeable back sheet 2. The topsheet 1 is made of a hydrophilic material and preferably has a soft feel. The back sheet 2 is made of a liquid impermeable or hydrophobic material, and is preferably formed of a hydrophobic nonwoven fabric having a soft feel and breathability.
[0021]
The top sheet 1 is composed of a plurality of sheets arranged in a direction orthogonal to the longitudinal direction of the disposable diaper. As will be described later with reference to FIGS. A side edge portion 17 located on the outer side with a portion 16 in contact with the heel portion as a center is adhered to the surface of the absorbent body 3 by an adhesive portion 10, and a side edge portion 18 located on the inner side of the disposable diaper is absorbed. A free edge 5 is formed apart from the surface of the body 3, and a ridge is formed by the free edge 5 at an overlapping portion L between the plurality of adjacent sheets. In FIG. 1, in the form in which the top sheets 1 overlap each other, the top sheet 1 and the back sheet 2 have a width dimension and a length dimension that are larger than those of the absorber 3. The top sheet 1 and the back sheet 2 are formed to have the same length and width as a whole, the top sheet 1 is overlaid on the back sheet 2, and the whole is bonded so as to be integrated at the outer periphery (periphery) of each other. ing. Moreover, the front and back double-sided sheets are extended outside the both sides of the width direction of the said absorber 3, and the side flap 19 is formed in both sides. A leg elastic elastic body 7 is disposed in an extended state between the top sheet 1 and the back sheet 2 forming the flap portion, and a waist elastic elastic body 8 and a fastening tape are provided on the back flap 20. 9 is disposed.
[0022]
The standing point 23 of the three-dimensional gather 21 may be on the absorber 3, but may be on the side of the absorber 3, and may be disposed across both. In the case of a disposable diaper having a pad structure, a three-dimensional gather 21 including an elastic body 22 on a sheet extending to the side of the absorbent body 3 may be used. Further, although not shown in FIG. 1, the free edge of the three-dimensional gather may be partially fixed with respect to the standing point 23, but may not be fixed and is not particularly limited. Also, when fixed, it may be on the inside or outside of the standing point 23 or on the standing point 23. However, it is desirable that the three-dimensional gather 21 is turned inward at the crotch portion. The rising point 23 of the three-dimensional gather 21 may be parallel or non-parallel. The height of the three-dimensional gather 21 is 5 mm or more and 100 mm or less at the crotch part, and preferably 10 mm or more and 60 mm or less. If the height of the three-dimensional gather 21 is higher than 100 mm, the three-dimensional gather sheet covers the absorber 3 depending on the wearer's wearing and posture. Moreover, when the height of the three-dimensional gather 21 is less than 5 mm, there is almost no leakage prevention effect of excrement. On the other hand, although not shown, the height of the weir of the three-dimensional gather 21 may be constant or may change along the longitudinal direction of the disposable diaper. That is, it may be a known three-dimensional gathered structure that is normally used for conventional disposable diapers and other absorbent articles, and is not particularly limited.
[0023]
Moreover, the sheet | seat which forms a three-dimensional gather may be the surface sheet 1 of the absorber 3 upper surface, the side sheet | seat of a side part flap upper surface, and the sheet | seat of another member may be sufficient as it. Furthermore, the sheet | seat which forms a three-dimensional gather does not need to be comprised with a single sheet, and these each sheet | seat may be bonded together. In addition, when bonding a plurality of sheets, a space may be formed in the three-dimensional gather 21.
[0024]
In the drawing, one elastic body 22 of the three-dimensional gather 21 is disposed at the free edge of the three-dimensional gather. However, the elastic body 22 may be disposed at or near the free edge. Although only one may be disposed on 21, a plurality of them may be disposed and are not particularly limited.
[0025]
Although the number of ridges of the free edge 5 of the surface sheet 1 is shown in this drawing, it is possible to provide two or more sheets as long as possible on the surface, and it is necessary to install them equally in the dorsal part. There is no. The width of each surface sheet 1 forming the free edge 5 is not less than 5 mm and not more than 50 mm, preferably not less than 15 mm and not more than 30 mm, and does not need to be uniform between the surface sheets. The width of the top sheet that does not form the free edge 5 at the center is 10 mm or more and less than the length in the longitudinal direction of the absorber 3, preferably 30 mm or more and 400 mm or less. The material of each surface sheet 1 does not need to be the same material. Moreover, the topsheet 1 preferably has a basis weight of 8 to 60 g / m ² and a thickness of 0.03 to 5 mm.
[0026]
FIG. 2 is a partially cutaway plan view of a disposable diaper that is an embodiment different from FIG. 1, in which the top sheet is composed of a side surface sheet and a center surface sheet, and the center surface sheet forms a plurality of ridges. It is. The absorber 3 is arrange | positioned between the surface sheet 1 and the back surface sheet 2, The surface sheet 1 consists of the center part surface sheet 13 and the side part surface sheet 14, and the center part surface sheet 13 is the part 16 which contact | connects the collar part of a disposable diaper. The free edge 5 is formed by a portion L (see FIG. 3) where adjacent sheets overlap each other. In the drawing, the standing point 23 of the three-dimensional gather 21 is on the side surface sheet 14, but it may be on the center surface sheet 13 and may be disposed across both.
[0027]
3 is a cross-sectional view taken along the line XX ′ of the disposable diaper of FIG. 1, and an absorbent body 3 is disposed between the liquid-permeable top sheet 1 and the liquid-impermeable back sheet 2. The absorbent body 3 is made of a known absorbent material usually used in conventional disposable diapers and other absorbent articles, and is bonded and fixed to the back sheet 2 partially or entirely by an adhesive or the like.
The top sheet 1 is composed of a plurality of sheets arranged in a direction orthogonal to the longitudinal direction of the disposable diaper, and the plurality of sheets are side edges located on the outer side with the portion 16 in contact with the buttocks of the disposable diaper as a center. 17 is bonded to the surface of the absorbent body by the bonding portion 10, the side edge portion 18 located on the inner side of the disposable diaper is spaced apart from the surface of the absorbent body 3 to form the free edge 5, A ridge is formed by the free edge 5 at the overlapping portion of the sheets, and a large number of openings 6 are formed.
[0028]
The overlapping portion L between the adjacent surface sheets may be 2 mm or more, preferably 5 mm or more, and the width of the overlapping surface sheet or less. If there is no overlapping part of the surface sheet 1, the absorbent body 3 may directly touch the wearer's skin depending on the wearing state of the wearer and may cause discomfort. This is because if there is an overlapping portion between the sheets 1, the free edge 5 of the lower surface sheet 1 cannot form a wrinkle. Further, the overlapping portion L of the top sheets need not be uniform between the top sheets 1. The free edge 5 of the topsheet 1 that forms the ridge may be formed by a cut surface of the topsheet 1, but preferably has a bent portion 11 formed by bending a part of the topsheet 1.
Further, the bonding portion 10 may be provided with an opening portion between adjacent sheets and can be bonded to the absorber to prevent displacement, and the size of the bonding portion 10 is not particularly specified. Absent. Also, the bonding method may be partial bonding of the bonding portion 10 or entire bonding, and is not particularly limited.
Furthermore, the non-adhesion area | region M to the absorber 3 of the surface sheet 1 used as the opening area to the absorber 3 is 2 mm or more and 500 mm or less, Preferably it is 5 mm or more and 300 mm or less. The non-adhesion region M of the topsheet 1 serving as an opening area to the absorber 3 to the absorber 3 has a width necessary for transferring excretion that is difficult to permeate the topsheet 1 directly to the absorber 3 and absorbing it. That is good. Each non-bonded region M need not be uniform between the openings 6.
[0029]
FIG. 4 is a cross-sectional view taken along the line XX ′ of the disposable diaper of FIG. 1 showing an embodiment different from FIG. 3 in which the diffusion layer 4 is disposed between the top sheet 1 and the absorber 3. In FIG. 4, the absorber 3 and the back sheet 2, and the diffusion layer 4 and the absorber 3 are bonded and fixed partially or entirely by an adhesive or the like. Further, the bonding portion 10 of the topsheet 1 is bonded to the diffusion layer 4.
[0030]
FIG. 5 is a cross-sectional view of the disposable diaper of FIG. 1 XX ′ showing another embodiment of FIGS. 3 and 4 in which the diffusion layer 4 and the topsheet 1 are integrally joined to form a bag. It is line sectional drawing. In FIG. 5, the absorber 3 and the back sheet 2, and the top sheet 1 and the diffusion layer 4 are bonded and fixed partially or entirely by an adhesive or the like. The diffusion layer 4 is joined and integrated with the surface sheet 1 to form a plurality of sheets arranged in a direction orthogonal to the longitudinal direction of the disposable diaper, and adjacent sheets overlap each other. In the plurality of sheets, in each surface sheet, the side edge portion 17 located on the outer side of the disposable diaper is bonded on the surface of the absorbent body, and the side edge portion 18 located on the inner side of the disposable diaper is separated from the surface of the absorbent body. A free edge 5 is formed at a distance from each other, and a crease is formed by the free edge 5 at an overlapping portion between a plurality of adjacent sheets, and a large number of openings 6 are formed.
In this way, by diffusing the diffusion layer 4 and the topsheet 1 to form the free edge 5, the free edge 5 of the topsheet 1 is separated from the adhering portion of the more adjacent topsheet 1 and the opening to the absorber 3 is opened. The portion 6 can be enlarged to prevent the excrement from leaking from around the waist.
[0031]
6 is a disposable diaper of FIG. 1 showing an embodiment different from that shown in FIGS. 3 to 5 in which a stretchable elastic body 12 is disposed in a bent portion 11 of a free edge 5 of a top sheet 1 forming a ridge. It is XX 'line sectional drawing of. The stretchable elastic body 12 is disposed in an extended state and is bonded with an adhesive.
In the drawing, the stretchable elastic body 12 is disposed on all the free edges 5, but the stretchable elastic body 12 may be partially disposed. By disposing the stretchable elastic body 12 on the free edge 5 of the topsheet 1, the free edge 5 of the topsheet 1 is elastically caused by the contraction of the stretchable elastic body 12, preventing excrement from leaking and absorbing. The opening 6 to the body 3 can be enlarged.
[0032]
FIG. 7 shows an embodiment different from FIGS. 3 to 6 in which a free edge 5 is formed by two surface sheets 1 and a space 15 is provided between the surface sheet 1 and the absorber 3. It is XX 'line sectional drawing of the disposable diaper of FIG. When the topsheet 1 forming the free edge 5 is bonded to the backsheet 2 at the end of the disposable diaper, it is not always necessary to form the bonding portion 10 with the surface of the absorber 3.
[0033]
【The invention's effect】
As described above, the disposable diaper of the present invention is formed with a ridge and free openings of a plurality of surface sheets arranged in a direction orthogonal to the longitudinal direction of the disposable diaper and a plurality of openings. Regardless of the wearer's wearing state, the excrement on the top sheet is prevented from leaking and the excrement is moved so that it does not remain on the top sheet. Covering the entire surface with a sheet improves the touch, has the effect of not causing the absorber itself to deform, lose shape, or leak the polymer, and a three-dimensional gather is formed along both longitudinal edges of the disposable diaper This prevents leakage in the lateral direction.
[Brief description of the drawings]
FIG. 1 is a partially cutaway plan view of a disposable diaper of the present invention.
FIG. 2 is a partially cutaway plan view showing an embodiment different from FIG. 1 of the disposable diaper of the present invention.
3 is a cross-sectional view taken along the line XX ′ of the disposable diaper of FIG.
4 is a cross-sectional view taken along line XX ′ of the disposable diaper of FIG. 1 showing an embodiment different from FIG. 3;
5 is a cross-sectional view taken along the line XX ′ of the disposable diaper of FIG. 1 showing an embodiment different from FIGS. 3 and 4. FIG.
6 is a cross-sectional view taken along the line XX ′ of the disposable diaper of FIG. 1 showing an embodiment different from FIGS. 3, 4, and 5. FIG.
7 is a cross-sectional view taken along the line XX ′ of the disposable diaper of FIG. 1 showing an embodiment different from FIGS. 3, 4, 5, and 6. FIG.
[Explanation of symbols]
1. 1. Liquid permeable top sheet 2. Liquid-impermeable back sheet Absorber 4. 4. Diffusion layer Free edge 6. Opening 7. 7. Elastic elastic body around leg 8. Elastic elastic body around waist Fastening tape10. Bonding part 11. Bending part 12. Free edge elastic body 13. Center surface sheet 14. Side surface sheet 15. Space 16. A part in contact with the buttocks 17. Side edge 18 located on the outside 18. 18. Side edge located on the inner side Side flaps 20. Back flap 21. Solid gather 22. Elastic body for three-dimensional gather 23. Solid gather start point Overlapping portion of surface sheet Non-adhesive area

Claims (1)

In a disposable diaper in which an absorber is disposed between a liquid-permeable top sheet and a liquid-impermeable back sheet, the top sheet is composed of a plurality of sheets arranged in a direction perpendicular to the longitudinal direction of the disposable diaper. In the plurality of sheets, side edges located on the outer side centering on a portion in contact with the buttocks of the disposable diaper are bonded to the surface of the absorber, and the side edges located on the inner side are absorbed. A free rim is formed apart from the body surface, and a fold is formed by the free rim at an overlapping portion between the adjacent sheets, and a plurality of openings are formed, and the disposable diaper A disposable diaper characterized in that solid gathers are formed along both side edges in the longitudinal direction.

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