JP6974094B2 - Disposable diapers - Google Patents

Description

The present invention relates to a disposable diaper, and more particularly to a disposable diaper provided with weirs on both sides of the rear part of the absorber to prevent excrement from leaking to the outside.

Conventionally, in order to prevent excrement from moving on the liquid-permeable top sheet and leaking to the outside, a diffusion layer having an uneven inner surface formed between the absorber and the liquid-impermeable back sheet. Is provided, and a means for providing a through hole penetrating in the thickness direction in the absorber has been proposed. (Patent Document 1)

Japanese Unexamined Patent Publication No. 2016-112232

However, in the means of Patent Document 1, when body pressure is applied to the excrement that has moved to the rear part of the top sheet without flowing into the through hole, the excrement may leak to the outside from both sides in the width direction of the disposable diaper. was there.

Therefore, a main object of the present invention is to provide a disposable diaper that holds excrement that has moved to the rear part of the top sheet and prevents excrement from leaking to the outside from both sides in the width direction.

The present invention that solves the above problems is as follows.
The first means is in a disposable diaper provided with a liquid-permeable top sheet, a liquid-impermeable back sheet, and an absorber provided between the top sheet and the back sheet.
Weirs that bulge toward the body are provided on both sides of the rear part of the absorber, the dam is formed by a bulky sheet and an inner absorber, and the bulky sheet is folded in a mountain on the side in the width direction and inside. Formed on the seat portion and the outer seat portion, the outer surface of the inner seat portion and the inner surface of the outer seat portion are not fixed, the inner absorber is fixed to the inner surface of the inner seat portion, and the outer surface of the outer seat portion is the absorber. In the portion of the inner absorber facing the inner sheet, a groove extending in the width direction with a predetermined interval in the anteroposterior direction is formed, and the portion of the inner absorber facing the outer sheet is formed in the front-rear direction. It is characterized in that a groove extending in the width direction is formed at a predetermined interval in the direction.

The second means is characterized in that, in the configuration of the first means, a space is formed between the outer surface of the inner sheet portion and the inner surface of the outer sheet portion at a predetermined interval in the vertical direction.

The third means is characterized in that, in the configuration of the first or second means, an opening extending in the front-rear direction is formed in the inner vicinity portion in the width direction of the weir portion in the top sheet in a plan view. ..

The fourth means is characterized in that, in the configuration of any one of the first to third means, an elastic stretchable member extended in the front-rear direction is fixed to an inner portion in the width direction of the inner absorber in a plan view. And.

The fifth means extends the inner absorber along the widthwise side portion of the bulky sheet to form the base of the inner absorber in the configuration of any one of the first to fourth means. , The absorber is connected to the side portion in the width direction.

According to the first means, dams that bulge toward the body are provided on both sides of the rear part of the absorber, the dam is formed by a bulky sheet and an inner absorber, and the bulky sheet is piled up on the side in the width direction. It is folded to form an inner sheet part and an outer sheet part, the outer surface of the inner sheet part and the inner surface of the outer sheet part are not fixed, the inner absorber is fixed to the inner surface of the inner sheet part, and the outer surface of the outer sheet part is absorbed. Since it is fixed to the body, the excrement that has moved to the rear of the top sheet is prevented from leaking to the outside by the dams provided on both sides of the absorber, and the excrement blocked by the dam is inside. It can be diffused through between the outer surface of the sheet portion and the inner surface of the outer sheet portion and absorbed by the inner absorber.
Further, a groove extending in the width direction is formed in the portion of the inner absorber facing the inner sheet at a predetermined interval in the front-rear direction, and a predetermined portion in the front-rear direction is formed in the portion of the absorber facing the outer sheet. Since the grooves extending in the width direction are formed at intervals, the excrement blocked by the weir portion can be diffused more quickly through the grooves and absorbed by the inner absorber.

According to the second means, in addition to the effect of the first means, a space was formed between the outer surface of the inner sheet portion and the inner surface of the outer sheet portion at a predetermined interval in the vertical direction, so that the space was blocked by the dam portion. The excrement can be rapidly diffused through between the outer surface of the inner sheet portion and the inner surface of the outer sheet portion and absorbed by the inner absorber.

According to the third means, in addition to the effect of the first or second means, in the plan view, an opening extending in the front-rear direction was formed in the vicinity of the inside in the width direction of the weir portion in the top sheet, so that the top was formed. The excrement that has moved to the rear part of the sheet can be quickly moved through the opening between the weirs provided on both sides of the absorber.

According to the fourth means, in addition to the effect of the means according to any one of the first to third means, in a plan view, an elastic elastic member extended in the front-rear direction was fixed to the inner portion in the width direction of the inner absorber. Therefore, wrinkles are formed in the portion of the top sheet facing the weir portion, and the excrement blocked by the weir portion can be diffused through the wrinkles of the top sheet and absorbed by the inner absorber, and also on both sides. A large space between the weirs can be formed to block a large amount of excrement.

According to the fifth means, in addition to the effect of the means according to any one of the first to fourth means, the inner absorber is extended along the widthwise side portion of the bulky sheet to extend the inner absorber. Since the base portion of the absorber is connected to the side portion in the width direction of the absorber, it is possible to prevent leakage of the bulky sheet of excrement blocked by the dam portion from both side portions in the width direction to the outside.

It is the inside plan view which developed the disposable diaper. It is the outside plan view which developed the disposable diaper. FIG. 1 is a cross-sectional view taken along the line AA of FIG. (A) is an inner plan view and (b) is a sectional view taken along the line AA of the absorber of the first embodiment. FIG. 4A is an inner plan view in which bulky sheets are fixed to the inner surfaces of both side portions of the back side portion of the absorber of FIG. 4, and FIG. 4B is a sectional view taken along the line AA. FIG. 5A is an internal plan view in which both side portions of the dorsal portion of the absorber of FIG. 5 are bent inward, and FIG. 5B is a cross-sectional view taken along the line AA. FIG. 6A is an inner plan view in which the top sheet is fixed to the inner surface of the absorber of FIG. 6, and FIG. 6B is a cross-sectional view taken along the line AA. The absorber of the second embodiment (a) is an inner plan view, and (b) is a sectional view taken along the line AA. FIG. 8A is an inner plan view in which bulky sheets are fixed to the inner surfaces of both side portions of the back side portion of the absorber of FIG. 8, and FIG. 8B is a cross-sectional view taken along the line AA. FIG. 9A is an internal plan view in which both side portions of the dorsal portion of the absorber of FIG. 9 are bent inward, and FIG. 9B is a cross-sectional view taken along the line AA. FIG. 9A is an inner plan view in which the top sheet is fixed to the inner surface of the absorber of FIG. 9, and FIG. 9B is a cross-sectional view taken along the line AA. (A) of the absorber of the third embodiment is an inner plan view, and (b) is a sectional view taken along the line AA. (A) is an inner plan view and (b) is a sectional view taken along the line AA in which a bulky sheet is fixed to the inner surfaces of both side portions of the back side portion of the absorber of FIG. FIG. 13A is an inner plan view in which the absorber is fixed to the inner surface of the bulky sheet of FIG. 13, and FIG. 13B is a cross-sectional view taken along the line AA. FIG. 14A is an inner plan view in which the top sheet is fixed to the inner surface of the absorber of FIG. 14, and FIG. 14B is a cross-sectional view taken along the line AA.

The disposable diaper of the present invention that suppresses the movement of excrement such as urine and loose stool and prevents the excrement from leaking to the outside will be described. In the present specification, the "anterior-posterior direction" refers to the direction connecting the ventral side and the dorsal side, the part corresponding to the wearer's abdomen when worn is referred to as the anterior part, and the part corresponding to the back part is referred to as the posterior part. The part corresponding to the crotch part is called the middle part. Further, the "width direction" means a direction orthogonal to the front-back direction. In this specification, a tape-type disposable diaper will be described as an example, but the disposable diaper of the present invention includes not only a tape-type disposable diaper but also a pants-type disposable diaper.

As shown in FIGS. 1 to 3, the disposable diapers include a liquid-permeable top sheet 10 provided on the body side of the wearer, a liquid-impermeable back sheet 11 provided on the opposite side of the body, and a top sheet. It is formed of an absorber 20 provided between the 10 and the back sheet 11. Further, an exterior sheet 12 is provided on the outer surface of the back sheet 11 which is an anti-body side surface, and an intermediate sheet is provided between the top sheet 10 and the absorber 20 to prevent the excrement absorbed by the absorber 20 from returning. 15 is provided.

In the width direction, three-dimensional gathers 40, 40 for preventing excrement from leaking to the outside are provided on both sides of the top sheet 10. Further, a flat gather 45 for preventing excrement from leaking to the outside is provided outside the base of the three-dimensional gather 40 fixed to the inner surface of the top sheet 10.

In the front-rear direction, end flap portions EF and EF on which the absorber 20 does not extend are provided on the front-rear side of the absorber 20, and in the width direction, the absorber 20 extends on both sides of the absorber 20. Side flap portions SF and SF that do not exist are provided.

Fastening tapes 50 are provided on the rear side portions of the side flap portions SF, and a rectangular target sheet 55 having a long side in the width direction is provided on the front portion of the exterior sheet 12.

As the top sheet 10, a perforated or non-perforated non-woven fabric, a porous plastic sheet, or the like can be used. The raw material fiber of the non-woven fabric is not particularly limited. For example, olefin-based fibers such as polyethylene and polypropylene, synthetic fibers such as polyester-based and polyamide-based fibers, recycled fibers such as rayon and cupra, natural fibers such as cotton, mixed fibers and composite fibers in which two or more of these are used. Etc. can be exemplified. The non-woven fabric may be manufactured by any processing. As the processing method, known methods such as a spunlace method, a spunbond method, a thermal bond method, a melt blown method, a needle punch method, an air through method, a point bond method and the like can be exemplified.

The back sheet 11 includes an olefin resin such as polyethylene or polypropylene, a laminated non-woven fabric in which a non-woven fabric is laminated on a polyethylene sheet or the like, or a non-woven fabric in which a waterproof film is interposed to ensure substantially liquid impermeability (in this case, waterproof). A back sheet is composed of a film and a non-woven fabric.)) And the like can be used. Further, a liquid-impermeable and moisture-permeable material that is preferably used from the viewpoint of preventing stuffiness can also be exemplified. As a sheet of this liquid-impermeable and moisture-permeable material, for example, an inorganic filler is kneaded into an olefin resin such as polyethylene or polypropylene to form a sheet, which is then stretched in a uniaxial or biaxial direction. The microporous sheet obtained in the above can be exemplified. Furthermore, it is waterproof by a non-woven fabric using microdenier fibers, leakage-proof strengthening by reducing the voids of the fibers by applying heat or pressure, and coating with a highly water-absorbent resin or hydrophobic resin or a water-repellent agent. A liquid-impermeable sheet can also be used without using a film.

The exterior sheet 12 is a portion that supports the absorber 20 and is attached to the wearer. The exterior sheet 12 has an hourglass shape in which the central portions in the front-rear direction on both sides are constricted, and this is a portion surrounding the wearer's legs.

As the exterior sheet 12, it is preferable to use a non-woven fabric, but the exterior sheet 12 is not limited to this. The type of the non-woven fabric is not particularly limited, and as the material fiber, for example, olefin-based fiber such as polyethylene or polypropylene, polyester-based synthetic fiber such as polyamide-based fiber, recycled fiber such as rayon or cupra, and natural fiber such as cotton are used. As the processing method, a spunlace method, a spunbond method, a thermal bond method, an air-through method, a needle punch method, or the like can be used. However, long-fiber non-woven fabrics such as spunbonded non-woven fabrics, SMS non-woven fabrics, and SMMS non-woven fabrics are suitable from the viewpoint of achieving both touch and strength. The non-woven fabric can be used alone or in layers. In the latter case, it is preferable to bond the nonwoven fabrics to each other with a hot melt adhesive or the like. When a non-woven fabric is used, the fiber basis weight is preferably 10 to 50 g / m ² , especially 15 to 30 g / m ² .

As the intermediate sheet 15, the same material as the top sheet 10 can be used. The intermediate sheet 15 is preferably bonded to the top sheet 10, and when heat embossing or ultrasonic welding is used for the bonding, the material of the intermediate sheet 15 is preferably one having a melting point similar to that of the top sheet 10. When a non-woven fabric is used for the intermediate sheet 15, the fineness of the fibers of the non-woven fabric is preferably about 2.0 to 5.0 dtex.

The absorber 20 is formed of an absorber core 20A and a packaging sheet 20B that encloses the absorber core 20A. The absorber 20 will be described later.

The three-dimensional gather 40 is formed of a gather sheet 41 and an elongated elastic elastic member 42 fixed in an extended state along the front-rear direction of the gather sheet 41. As the gather sheet 41, a water-repellent nonwoven fabric can be used, and as the elastic elastic member 42, thread rubber or the like can be used.

The base of the gather sheet 41 corresponding to the base of the three-dimensional gather 40 is fixed to the side portion in the width direction of the top sheet 10. Further, the portion located outside the base portion of the gather sheet 41 is fixed to the side portion in the width direction of the back sheet 11 and the exterior sheet 12.

The portion located inside the front and rear parts of the gather sheet 41 corresponding to the front and rear parts of the three-dimensional gather 40 is fixed to the top sheet 10, and the base portion in the middle part of the gather sheet 41 corresponding to the middle part of the three-dimensional gather 40. The inner part is not fixed to the top sheet 10. As a result, when worn, the middle portion of the gather sheet 41 stands up toward the body side due to the contraction force of the elastic elastic member 42, and the middle portion of the three-dimensional gather 40 is in close contact with the crotch portion of the wearer to the outside of the excrement. It is possible to prevent leakage to.

The flat gather 45 is formed of a gather sheet 41, a back sheet 11, an exterior sheet 12, and an elongated elastic elastic member 46 fixed in an extended state along the front-rear direction of the back sheet 11. As a result, when worn, the contractile force of the elastic elastic member 46 forms a wavy flat gather 45 on the side flap portion SF in a cross-sectional view, and the flat gather 45 comes into close contact with the wearer's leg to excrete. It is possible to prevent leakage to the outside. Further, as the elastic elastic member 46, thread rubber or the like can be used.

The fastening tape 50 is formed of a base material 51 and a locking portion 52 provided on the inner surface of the base material 51. As the base material 51, a non-woven fabric, a plastic film, a polylami non-woven fabric, paper or a composite material thereof can be used, and as the locking portion 52, a hook material of a mechanical fastener or an adhesive member can be used. The base portion of the base material 51 is fixed between the gather sheet 41 and the exterior sheet 12.

As the target sheet 55, a plastic film or a non-woven fabric having a large number of loop threads provided on the surface can be used. The target sheet 55 is fixed to an intermediate portion in the width direction in the front portion of the exterior sheet 12.

<Absorbent of the first embodiment>
Next, the absorber 20 of the first embodiment will be described. As shown in FIG. 4, the absorber 20 includes an absorber 21 having a predetermined length in the width direction and extending in the front-rear direction, and absorbers located on both sides of the rear portion of the absorber 21 (claims). The "inner absorber") 22 and 22 in the above are integrally formed.

Next, as shown in FIG. 5, bulky sheets 23, 23 are fixed to both side portions of the rear portion of the absorber 21 and the inner surfaces of the absorbers 22, 22. In the form shown in FIG. 5, the bulky sheet 23 fixed to the inner surface of the absorber 22 located on the left side and the left side of the rear portion of the absorber 21 and the right side portion and the right side of the rear portion of the absorber 21 are located. The bulky sheet 23 fixed to the inner surface of the absorber 22 is separated from the bulky sheet 23, but the bulky sheet 23 is located on the left side of the absorber 22 from the left side to the right side of the absorber 22. It can also be formed continuously up to the part.

Next, as shown in FIG. 6, the side portions of the absorber 22 and the bulky sheet 23 located on the left side are folded in a mountain fold and folded in the inner surface direction, that is, folded in a substantially C shape to protrude toward the body side. The absorber 22 located on the right side and the side portion of the bulky sheet 23 are folded in a mountain shape to form a weir portion 24 that protrudes toward the body side by folding in the inner surface direction, that is, in a substantially inverted C shape. As a result, the absorber 20 having the weirs 24, 24 protruding toward the body can be formed on both sides of the rear portion of the absorber 21, and the excrement that has moved to the rear portion of the top sheet 10 can be formed on both sides. It can be held in the space S1 formed between the provided weir portions 24, 24 to prevent the excrement from leaking to the outside. It should be noted that the absorbers 22 and 22 and the bulky sheets 23 and 23 are provided over the entire area of both sides of the absorber 21 in the front-rear direction, and the weirs projecting toward the body over the entire area of both sides of the absorber 21 in the front-rear direction. The absorber 20 provided with the portions 24, 24 can be formed.

Further, the facing surfaces of the inner sheet portion 23A and the outer sheet portion 23B of the bulky sheet 23 folded at the side portion are not fixed, and in the cross-sectional view, the outer surface of the inner sheet portion 23A and the inner surface of the outer sheet portion 23B are A space S2 having a predetermined interval in the vertical direction is formed between the outer surface of the inner sheet portion 23A and the inner surface of the outer sheet portion 23B separated in the vertical direction orthogonal to the front-rear direction. As a result, the excrement that has moved to the rear part of the top sheet 10 can be moved to the absorber 22 forming the weir portion 24 via the space S2 and quickly absorbed by the absorber 22. It is also possible to separately provide and superimpose the inner sheet corresponding to the inner sheet portion 23A and the outer sheet corresponding to the outer sheet portion 23B of the bulky sheet 23.

Next, as shown in FIG. 7, the top sheet 10 is fixed to the inner surfaces of the absorber 21 and the weir portion 24. Further, a plurality of openings 25, 25 are provided on both sides of the portion of the top sheet 10 facing the space S1 formed between the weir portions 24, 24 at predetermined intervals in the front-rear direction and the left-right direction. Has been done. As a result, the excrement that has moved to the rear part of the top sheet 10 can be quickly moved to the space S1 formed between the weir portions 24 and 24 through the opening 25.

As the absorber core 20A, an aggregate of fibers can be used. The fiber aggregate is a filament aggregate obtained by stacking short fibers such as cotton-like pulp and synthetic fibers, and opening tow (fiber bundle) of synthetic fibers such as cellulose acetate as needed. Can also be used. The basis weight of fibers, when fiber stacking flocculent pulp or short fibers, for example, be a 100 to 300 g / m ² approximately, in the case of a filament aggregate, for example, be 30 to 120 g / m ² approximately Can be done. In the case of synthetic fibers, the fineness is, for example, 1 to 16 dtex, preferably 1 to 10 dtex, and more preferably 1 to 5 dtex. In the case of a filament aggregate, the filament may be a non-crimped fiber, but is preferably a crimped fiber. The degree of crimping of the crimped fibers can be, for example, 5 to 75 pieces per 2.54 cm, preferably 10 to 50 pieces, and more preferably about 15 to 50 pieces. In addition, crimped fibers that have been uniformly crimped can be used.

The absorber core 20A preferably contains the highly absorbent polymer particles, and in particular, at least in the liquid receiving region, the highly absorbent polymer particles (SAP particles) are substantially dispersed in the thickness direction with respect to the aggregate of fibers. Those that have been used are preferable.

If there are no, or even very few SAP particles in the upper, lower, and middle parts of the absorber core 20A, it cannot be said to be "dispersed over the entire thickness direction". Therefore, "distributed in the entire thickness direction" means that the aggregates of fibers are "uniformly" dispersed in the entire thickness direction, as well as "unevenly distributed" in the upper part, the lower part, and / or the middle part. However, it also includes forms that are still dispersed in the upper, lower and middle parts. Further, the form in which some SAP particles do not enter the fiber aggregate and remain on the surface thereof, and the form in which some SAP particles pass through the fiber aggregate and are on the packaging sheet 20B are also excluded. It's not something.

The highly absorbent polymer particles include "powder" as well as "particles". The particle size of the highly absorbent polymer particles can be the same as that used for this kind of absorbent article, and is preferably 1000 μm or less, particularly 150 to 400 μm. The material of the highly absorbent polymer particles can be used without particular limitation, but those having a water absorption of 40 g / g or more are preferable. Highly absorbent polymer particles include starch-based, cellulose-based and synthetic polymer-based ones, which are starch-acrylic acid (salt) graft copolymers, starch-acrylonitrile copolymer sakens, and cross-linking of sodium carboxymethyl cellulose. A substance, an acrylic acid (salt) polymer, or the like can be used. As the shape of the highly absorbent polymer particles, the commonly used powder or granular material is preferable, but other shapes can also be used.

As the highly absorbent polymer particles, those having a water absorption rate of 70 seconds or less, particularly 40 seconds or less, are preferably used. If the water absorption rate is too slow, so-called reversion is likely to occur in which the liquid supplied into the absorber core 20A returns to the outside of the absorber core 20A.

The basis weight of the highly absorbent polymer particles can be appropriately determined according to the absorption amount required for the use of the absorber core 20A. Therefore, although it cannot be said unconditionally, it can be set to 50 to 350 g / m ² . If the basis weight of the polymer ^{is less than 50 g / m 2} , it becomes difficult to secure the absorption amount. If it exceeds 350 g / m ² , not only the effect is saturated, but also the excess of the highly absorbent polymer particles gives a jerky discomfort.

As the packaging sheet 20B, tissue paper, particularly crepe paper, non-woven fabric, polylami non-woven fabric, a sheet having small holes, or the like can be used. However, it is desirable that the sheet does not allow the highly absorbent polymer particles to escape. When a non-woven fabric is used instead of the crepe paper, a hydrophilic SMMS (spunbond / meltblown / meltblown / spunbond) non-woven fabric is particularly suitable, and polypropylene, polyethylene / polypropylene or the like can be used as the material. The fiber basis weight is preferably 5 to ^{40 g / m 2} , especially 10 to 30 g / m ^2.

The bulky sheet 23 is made of the same material as the intermediate sheet 15. When a non-woven fabric is used for the bulky sheet 23, the fineness of the fibers of the non-woven fabric is preferably about 2.0 to 5.0 dtex.

<Absorbent of the second embodiment>
Next, the absorber 20 of the second embodiment will be described. The same members as those of the absorber 20 of the first embodiment are designated by the same reference numerals to simplify the description.

As shown in FIG. 8, the absorbers 22 located on the left side and the left side in the rear part of the absorber 21 have a predetermined interval in the front-rear direction from the left end portion of the absorber 22 to the left portion in the rear portion of the absorber 21. A groove 27 extending to the rear of the absorber 21 is formed, and the absorber 22 located on the right side and the right side of the rear part of the absorber 21 has a predetermined interval in the front-rear direction from the right end portion of the absorber 22 to the rear portion of the absorber 21. A groove 27 extending to the right side of the above is formed.

Next, as shown in FIG. 9, the bulky sheet 23 is fixed to the inner surfaces of the absorbers 22 located on the left and left sides of the rear part of the absorber 21, and the absorbers located on the right and right sides of the rear part of the absorber 21 are fixed. The bulky sheet 23 is fixed to the inner surface of the body 22.

Next, as shown in FIG. 10, the absorber 22 and the bulky sheet 23 located on the left side are folded inward to form a weir portion 24 protruding toward the body, and the absorber 22 and the bulky sheet 23 located on the right side are formed. Is folded inward to form a weir portion 24 protruding toward the body. As a result, the absorber 20 having the weirs 24, 24 protruding toward the body can be formed on both sides of the rear portion of the absorber 21, and the excrement that has moved to the rear portion of the top sheet 10 can be formed on both sides. It can be held in the space S1 formed between the provided weir portions 24, 24 to prevent the excrement from leaking to the outside. In addition, the excrement held in the space S1 can be rapidly diffused into the absorber 22 through the grooves 27 and 27.

Next, as shown in FIG. 11, the top sheet 10 is fixed to the inner surfaces of the absorber 21 and the weir portion 24.

<Absorbent of the third embodiment>
Next, the absorber 20 of the third embodiment will be described. The same members as those of the absorber 20 of the first embodiment are designated by the same reference numerals to simplify the description.

As shown in FIG. 12, the bulky sheets 23 and 23 are fixed to the inner surfaces of both side portions of the rear portion of the absorber 21. The left portion of the bulky sheet 23 located on the left side extends to the left side of the left end portion of the rear part of the absorber 21, and the right portion of the bulky sheet 23 located on the right side extends to the right side of the rear portion of the absorber 21. It extends to the right side of the part.

Next, as shown in FIG. 13, the left part of the bulky sheet 23 located on the left side is folded inward, the right part of the bulky sheet 23 located on the right side is folded inward, and the bulky sheet 23 located on the left side is substantially C. Fold it in a shape, and fold the bulky sheet 23 located on the right side into a substantially inverted C shape. The facing surfaces of the inner sheet portion 23A and the outer sheet portion 23B of the bulky sheet 23 folded at the side portion are not fixed, and the outer surface of the inner sheet portion 23A and the inner surface of the outer sheet portion 23B are viewed in cross section. Spaces S2 having a predetermined interval in the vertical direction orthogonal to the front-rear direction are formed between them.

Next, as shown in FIG. 14, a rectangular absorber (“inner absorber” in the claims) 29 is fixed to the inner surface of the folded bulky sheet 23 located on the left side, and the folded body is located on the right side. A rectangular absorber 29 is fixed to the inner surface of the bulky sheet 23. As a result, the absorber 20 having the weirs 24, 24 protruding toward the body can be formed on both sides of the rear portion of the absorber 21, and the excrement that has moved to the rear portion of the top sheet 10 can be formed on both sides. It can be held in the space S1 formed between the provided weir portions 24, 24 to prevent the excrement from leaking to the outside. Further, the height of the weir portion 24 can be adjusted by changing the thickness of the absorber 29 in the vertical direction, and the capacity of the space S1 can be easily adjusted. Further, in order to prevent the excrement from leaking to the outside, an absorber may be connected to the outer side portion in the width direction of the weir portion 24.

Further, an elongated elastic elastic member 30 fixed in an elongated state along the front-rear direction is provided on the inner surface of the inner surface of the absorber 29 located on the left side, and is provided on the inner surface of the inner surface of the absorber 29 located on the right side. , An elongated elastic elastic member 30 fixed in an extended state along the front-rear direction is provided. As a result, a space corresponding to the weir portion 24 of the top sheet 10, which will be described later, is formed between the weir portions 24 and 24 by forming wrinkles extending in the front-rear direction with a predetermined interval in the vertical direction. The excrement retained in S1 can be rapidly diffused into each absorber 29 through wrinkles. Further, since the absorber 29 is deformed in an arc shape, it is possible to form a large deposit of the space S1 formed between the weir portions 24 and 24. As the elastic elastic member 30, thread rubber or the like can be used.

Next, as shown in FIG. 15, the top sheet 10 is fixed to the inner surfaces of the absorber 21 and the weir portion 24.

<Explanation of terms in the specification>
When the following terms are used in the specification, they have the following meanings unless otherwise specified in the specification.
-"Elongation rate" means a value when the natural length is 100%.
・ "Metsuke" is measured as follows. After pre-drying the sample or test piece, leave it in a test room or device in a standard state (test location: temperature 23 ± 1 ° C., relative humidity 50 ± 2%) to bring it to a constant weight. Pre-drying refers to constant weight of a sample or test piece in an environment with a temperature of 100 ° C. For fibers with an official moisture content of 0.0%, pre-drying does not have to be performed. From the test piece in a constant weight state, a sample having a size of 100 mm × 100 mm is cut out using a sampling template (100 mm × 100 mm). Weigh the sample and multiply it by 10 to calculate the weight per square meter and use it as a basis weight.
-The "thickness" is automatically measured using an automatic thickness measuring device (KES-G5 handy compression tester) under the conditions of ^{a load of 0.098 N / cm 2} and a pressurized area of 2 cm ^2.
-"Water absorption" is measured by JIS K7223-1996 "Water absorption test method for highly water-absorbent resin".
-"Water absorption rate" is the "time to the end point" when JIS K7224-1996 "Water absorption rate test method for superabsorbent polymer" was performed using 2 g of super absorbent polymer and 50 g of physiological saline. And.
-If there is no description of the environmental conditions in the test or measurement, the test or measurement shall be performed in a test room or equipment under standard conditions (test location: temperature 23 ± 1 ° C, relative humidity 50 ± 2%). do.
-Unless otherwise specified, the dimensions of each part mean the dimensions in the unfolded state, not the natural length state, and the unfolded state means the flat unfolded state without shrinkage or slack.

The present invention can be used for disposable diapers.

10 Top sheet 11 Back sheet 20 Absorber 22 Absorber (inner absorber)
23 Bulky sheet 23A Inner sheet 23B Outer sheet 24 Weir 25 Opening 27 Groove 29 Absorber (inner absorber)
30 Elastic elastic member S2 Space

Claims (5)

In a disposable diaper provided with a liquid-permeable top sheet, a liquid-impermeable back sheet, and an absorber provided between the top sheet and the back sheet.
Weirs that bulge toward the body are provided on both sides of the rear part of the absorber.
The weir portion is formed of a bulky sheet and an inner absorber, and is formed.
The bulky sheet is folded in a mountain on the side portion in the width direction to form an inner sheet portion and an outer sheet portion.
The outer surface of the inner sheet portion and the inner surface of the outer sheet portion are not fixed.
The inner absorber is fixed to the inner surface of the inner sheet portion, and the inner absorber is fixed to the inner surface.
The outer surface of the outer sheet portion is fixed to the absorber, and the outer surface is fixed to the absorber.
A groove extending in the width direction is formed in a portion of the inner absorber facing the inner sheet at a predetermined interval in the front-rear direction, and a predetermined portion in the front-rear direction is formed in the portion of the absorber facing the outer sheet. A disposable diaper characterized by forming grooves extending in the width direction at intervals. The disposable diaper according to claim 1, wherein a space is formed between the outer surface of the inner sheet portion and the inner surface of the outer sheet portion at a predetermined interval in the vertical direction. The disposable diaper according to claim 1 or 2, wherein in a plan view, an opening extending in the front-rear direction is formed in the vicinity of the inside of the weir portion in the width direction of the top sheet. The disposable diaper according to any one of claims 1 to 3, wherein an elastic elastic member extended in the front-rear direction is fixed to an inner portion in the width direction of the inner absorber in a plan view. Any of claims 1 to 4 , wherein the inner absorber extends along the widthwise side portion of the bulky sheet and the base portion of the inner absorber is connected to the widthwise side portion of the absorber. The disposable diaper described in item 1.

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