JP7633081B2 - Absorbent articles - Google Patents

Description

The present invention relates to an absorbent article.

Conventionally, in absorbent articles such as disposable diapers, three-dimensional gathers and waist gathers have been formed in the absorbent article in order to effectively prevent leakage of excrement such as urine and feces. In such absorbent articles, the three-dimensional gathers prevent leakage of excrement in the lateral direction of the absorbent article, and the waist gathers improve the fit around the waist of the wearer, thereby preventing leakage around the waist.

For example, Patent Document 1 describes an absorbent article with three-dimensional gathers. The three-dimensional gathers are formed by a three-dimensional gather sheet having an elastic member for forming the three-dimensional gathers along the longitudinal direction. The three-dimensional gather sheet has both longitudinal ends fixed to a top sheet that covers the skin-facing surface of the absorbent core. The fixed parts between the three-dimensional gather sheet and the top sheet are located at one each on the back side and the ventral side of the absorbent article. In addition, the absorbent article in Patent Document 1 has a waist circumference elastic member arranged along the width direction at the end of the back side.

Patent Document 2 describes an absorbent article having waist gathers and three-dimensional gathers. The absorbent article of Patent Document 2 has a fastening tape that protrudes in the width direction on its back side. The waist gathers are provided along the width direction at a position spaced from the absorbent body between the fastening tapes on both sides of the back side. The absorbent article of the same document also has a side sheet on the skin-facing side of the top sheet and to the width direction of the top sheet. Three-dimensional gathers are formed on the inside in the width direction of the side sheet. The three-dimensional gathers are fixed to the longitudinal ends of the absorbent article.

JP 2016-10442 A JP 2019-97871 A

In conventional absorbent articles, it is difficult to adequately prevent leakage of excrement from the back side, and when the amount of excrement is large or the excrement speed is fast, the excrement may not be absorbed sufficiently, resulting in leakage. In this regard, Patent Documents 1 and 2 describe the formation of a pocket for accommodating the excrement in the back side of the absorbent article. Specifically, Patent Document 1 describes that the contraction force of the three-dimensional gathers pulls the fixed part between the three-dimensional gathers and the top sheet inward in the longitudinal direction, causing the back side to bend inward in the longitudinal direction, forming a pocket. Patent Document 2 describes that the area between the waist gathers and the absorbent body shrinks due to the contraction of the waist gathers, forming a pocket.

As described above, Patent Document 1 describes that the back portion is bent inward in the longitudinal direction. However, in the absorbent article of Patent Document 1, since only both longitudinal ends of the three-dimensional gathers are fixed to the top sheet, the back portion of the diaper itself cannot be contracted inward in the longitudinal direction. Therefore, in the absorbent article of Patent Document 1, it is difficult to sufficiently curve the back portion and to provide a sufficient space in the pocket formed in the back portion. The absorbent article of Patent Document 2 also has a similar problem. Thus, in the diapers of Patent Documents 1 and 2, it is difficult to form a pocket having a sufficiently large space in the back portion, and therefore it is difficult to effectively prevent excrement from leaking from the back side.
Therefore, an object of the present invention is to provide an absorbent article that can overcome the above-mentioned drawbacks of the conventional techniques.

The present invention provides an absorbent body having an absorbent core, a top sheet arranged on the skin-facing side of the absorbent body, and a back sheet arranged on the non-skin-facing side of the absorbent body,
An absorbent article having a ventral side portion disposed on the ventral side of a wearer, a dorsal side portion disposed on the dorsal side of the wearer, and a crotch portion located between the ventral side portion and the dorsal side portion, the absorbent article having a longitudinal direction extending from the ventral side portion through the crotch portion to the dorsal side portion and a lateral direction perpendicular to the longitudinal direction,
The absorbent article has a region where the absorbent core is not present outside an end edge of the absorbent core in the longitudinal direction of the rear side portion,
The absorbent body has leak-proof cuffs arranged on both sides along the longitudinal direction,
The leakage preventing cuff has a fixed end and a free end, and a leakage preventing cuff forming elastic member is arranged in a stretched state along the longitudinal direction at the free end,
In the back side portion, the free end portion of the leakage preventing cuff and the top sheet are joined at a first joint portion located at an end portion in the longitudinal direction of the absorbent article and a second joint portion spaced away from the first joint portion toward the crotch portion in the longitudinal direction,
The second joint portion is located closer to the crotch portion than the end edge of the absorbent core, thereby providing an absorbent article.

The present invention provides an absorbent article that is less likely to cause leakage of excrement from the back side.

FIG. 1 is a developed plan view showing a schematic view of the skin-facing surface side of a disposable diaper, which is one embodiment of an absorbent article of the present invention, in a developed and stretched state. FIG. 2 is a cross-sectional view taken along line II-II of FIG. FIG. 3 is a partially cutaway perspective view of the rear portion of the disposable diaper shown in FIG. 1 in a worn state. FIG. 4 is an enlarged view of a main portion of FIG.

The absorbent article of the present invention will be described below based on its preferred embodiments. Figures 1 to 3 show an open-type disposable diaper (hereinafter, also simply referred to as a "diaper"), which is one embodiment of the absorbent article of the present invention.
The diaper 1 shown in Fig. 1 has a ventral portion A arranged on the ventral side of a wearer when the diaper 1 is worn, a dorsal portion B arranged on the dorsal side, and a crotch portion C arranged in the crotch portion. The diaper 1 also has a longitudinal direction X extending from the ventral portion A through the crotch portion C to the dorsal portion B, and a transverse direction Y perpendicular to the longitudinal direction X. The ventral portion A, the crotch portion C, and the dorsal portion B are regions obtained by dividing the entire length of the diaper 1 in the longitudinal direction X into three equal parts, and extend continuously in the front-to-rear direction of the wearer. The crotch portion C has an excretory portion-facing portion (not shown) that is arranged to face the excretory portion of the wearer when the diaper 1 is worn.

As shown in Figures 1 and 2, the diaper 1 comprises an absorbent body 23, a top sheet 21 arranged on the skin-facing side of the absorbent body 23, and a back sheet 22 arranged on the non-skin-facing side of the absorbent body 23, and these components constitute the absorbent main body 2.
The top sheet 21 and the back sheet 22 each have a size larger than that of the absorbent body 23 and extend outward from the outer peripheral edge of the absorbent body 23. In the embodiment shown in Fig. 1, both longitudinal end edges of the back sheet 22 substantially coincide with both longitudinal end edges of the diaper 1.

As shown in FIG. 1, the absorbent body 23 is arranged so that its longitudinal direction coincides with the vertical direction X of the diaper, and extends from the abdominal portion A through the crotch portion C to the dorsal portion B. Both side edges of the absorbent body 23 along the vertical direction X are located inward of both side edges of the diaper 1 along the vertical direction X. As shown in FIG. 2, the absorbent body 23 is formed by covering an absorbent core 24 having absorption performance with a liquid-permeable core wrap sheet 25. It is preferable that at least the skin-facing surface of the absorbent core 24 is covered with the core wrap sheet 25, and the entire surface including the skin-facing surface and non-skin-facing surface may be covered with the core wrap sheet 25.

As shown in FIG. 1, both end edges 24a, 24b of the absorbent core 24 in the longitudinal direction X are located inward of both end edges 1a, 1b of the diaper 1 in the longitudinal direction X. In other words, the diaper 1 has an area where the absorbent core 24 is not present (hereinafter referred to as the "core-absent area") outside the end edges 24a, 24b of the absorbent core 24 in the longitudinal direction X of the ventral portion A and the rear portion B. In this embodiment, the core-absent area is present in both the ventral portion A and the rear portion B. In this specification, the core-absent area present in the ventral portion A is referred to as the ventral core-absent area Ra, and the core-absent area present in the rear portion B is referred to as the rear core-absent area Rb. The core wrap sheet 25 may or may not be present in the core-absent area.

1 and 2, a plurality of leg gather elastic members 51 are arranged on the side of the diaper 1 in the vertical direction X. The leg gather elastic members 51 are arranged in a stretched state along the vertical direction X at a position outside the side edge of the absorbent body 23 in the horizontal direction Y. The leg gather elastic members 51 extend at least over the entire length of the crotch part C in the vertical direction X. Contraction of the elastic members 51 forms leg gathers on the left and right parts arranged around the legs of the wearer, i.e., on both sides of the diaper 1 in the vertical direction X. The leg gather elastic members 51 are fixed between the leakproof cuffs 3 and the back sheet 22 as shown in FIG. 2. The leg gather elastic members 51 are also located outside the horizontal direction Y of the fixed end portions 3a described later as shown in FIG. 2.

As shown in FIG. 1, the diaper 1 has multiple absorbent gather elastic members 52 within the width of the absorbent 23. The absorbent gather elastic members 52 are arranged in a stretched state along the longitudinal direction X. The absorbent gather elastic members 52 extend over at least the entire length of the crotch portion C in the longitudinal direction X. As shown in FIG. 2, the absorbent gather elastic members 52 are fixed between the core wrap sheet 25 and the back sheet 22 of the absorbent 23.

As shown in FIG. 1, the diaper 1 has a pair of fastening tapes 6 on both side edges along the vertical direction X of the back side B of the diaper 1. The fastening tape 6 includes a tape base 61 that is joined to the absorbent body 2, and a tape gripping portion 62 that is joined to the tape base 61 and extends in the horizontal direction Y. A fastening portion 62a is attached to the skin-facing surface of the tape gripping portion 62. Two pairs of fastening portions 62a are provided on the left and right. For example, a male member of a hook-and-loop fastener can be used as the fastening portion 62a.

The diaper 1 has a covering area (not shown) to which the fastening part 62a can be removably attached on the non-skin-facing surface of the back sheet 22 that forms the non-skin-facing surface of the abdominal portion A. The covering area can be formed by bonding and fixing the female member of the hook-and-loop fastener to the non-skin-facing surface of the back sheet 22 by known bonding means (e.g., adhesive, heat sealing, etc.).

As shown in Figs. 1 and 2, the diaper 1 has a pair of leak-proof cuffs 3, 3 on both sides of the absorbent body 2 in the vertical direction X. The leak-proof cuffs 3 are arranged along the vertical direction X. As shown in Fig. 2, the leak-proof cuffs 3 have fixed ends 3a at one end in the horizontal direction Y, which are fixed to other members (the top sheet 21 and the back sheet 22 in the embodiment shown in Fig. 2). The other end of the leak-proof cuffs 3 in the horizontal direction Y is a free end 3b that is not fixed to other members. At the free end 3b of the leak-proof cuffs 3, one or more thread-like or band-like elastic members (hereinafter referred to as "leak-proof cuff-forming elastic members") 31 are arranged in a stretched state along the vertical direction X (Fig. 2 shows multiple elastic members 31). The leak-proof cuffs 3 stand up at least in the crotch area C as the stretched elastic members 31 contract when the diaper 1 is worn, thereby preventing the outflow of excrement such as urine outward in the horizontal direction Y.

In the back side portion B of the diaper 1, the free ends 3b of the leakage preventing cuffs 3 and the topsheet 21 are joined at a first joint portion 41 and a second joint portion 42. That is, in the back side portion B of the diaper 1, the free ends 3b of the leakage preventing cuffs 3 and the topsheet 21 are joined at two positions. The first joint portion 41 is located at an end portion in the longitudinal direction X of the back side portion B of the diaper 1. The second joint portion 42 is spaced apart from the first joint portion 41 in the longitudinal direction X. The second joint portion 42 is located closer to the crotch portion C than the end edge 24b of the absorbent core 24.
On the other hand, in the abdominal side portion A, the free end portions 3b of the leakage preventing cuffs 3 and the topsheet 21 are joined at third joining portions 43 located at the ends of the diaper 1. In other words, in the abdominal side portion A of the diaper 1, the free end portions 3b of the leakage preventing cuffs 3 and the topsheet 21 are joined at one position.
There are no particular limitations on the method for forming the first bonded portion 41, the second bonded portion 42, and the third bonded portion 43. For example, the first to third bonded portions 41, 42, 43 may be formed by bonding the free end portions 3b of the leakage preventing cuffs 3 to the top sheet 21 with an adhesive or the like. Alternatively, the first to third bonded portions 41, 42, 43 may be formed by fusing the free end portions 3b of the leakage preventing cuffs 3 to the top sheet 21 with heat, ultrasound, or the like.

In the diaper 1 of this embodiment, the free end 3b of the leak-proof cuff 3 and the top sheet 21 are joined in the rear portion B at a first joining portion 41 and a second joining portion 42 spaced apart in the longitudinal direction X, forming a pocket P with a sufficient space inside in the rear portion B. Since excrement is contained in the space within this pocket P, the diaper 1 of this embodiment is less likely to leak excrement from the rear side. This point will be described below with reference to FIG. 3.

In this embodiment, as described above, the elastic member 31 for forming the leak-proof cuff is arranged along the vertical direction X at the free end 3b of the leak-proof cuff 3. Therefore, due to the contractile force of the elastic member 31 for forming the leak-proof cuff, the first joint 41 and the second joint 42 contract so as to approach each other along the vertical direction X, as shown in FIG. 3. As a result, the back side portion B of the diaper 1 contracts along the vertical direction X, and the back side portion B is sufficiently curved, so that a pocket P having a sufficient space inside is formed in the back side portion B. In addition, since the back side core-free region Rb is more likely to be curved because the absorbent core 24 is not present, the shape of the pocket P formed in the back side portion B is more likely to become three-dimensional. In this way, according to the diaper 1, the pocket P having a sufficient space inside is formed in the back side portion B, so that even when the amount of excretion is large or the excretion speed is high, the excreta can be temporarily stored in the pocket P. Therefore, according to the diaper 1 of this embodiment, excreta is less likely to leak from the back side.

In the embodiment shown in FIG. 1, it is preferable that an elastic member other than the leak-proof cuff-forming elastic member 31 is disposed between the position of the first joint 41 and the position of the second joint 42 in the longitudinal direction X of the diaper 1. This allows the area between the first joint 41 and the second joint 42 in the back portion B to be contracted more strongly, so that a pocket P with sufficient internal space can be more successfully formed in the back portion B.

As the other elastic member, any one or more selected from (1) the leg gather elastic member 51, (2) the absorbent gather elastic member 52, and (3) the elastic sheet 53 that stretches in the vertical direction X can be used. In the embodiment shown in FIG. 1, the leg gather elastic member 51, the absorbent gather elastic member 52, and the elastic sheet 53 are all arranged between the position of the first joint 41 and the position of the second joint 42 in the vertical direction X of the diaper 1. Specifically, the leg gather elastic member 51 and the absorbent gather elastic member 52 extend from the crotch portion C to the position of the first joint 41 in the vertical direction X. The elastic sheet 53 extends along the vertical direction X so as to straddle the edge 24b of the absorbent core 24 in the back side portion B. From the viewpoint of simplifying the manufacturing process of the diaper 1, it is preferable that the other elastic member is one or more selected from the leg gather elastic member 51 and the absorbent gather elastic member 52.

When the elastic member 52 for the absorbent gathers or the stretchable sheet 53 is disposed in a region between the first joint 41 and the second joint 42 in the longitudinal direction X of the diaper 1, it is preferable that the elastic member 52 for the absorbent gathers or the stretchable sheet 53 is located within the width of the absorbent 23. This allows the region in which the pocket P is formed to be within the width of the absorbent 23, so that the excrement temporarily stored in the internal space of the pocket P can be more easily absorbed by the absorbent 23. As shown in FIG. 1, when the diaper 1 has a plurality of elastic members 51 for the leg gathers, it is preferable that at least one of the plurality of elastic members 51 for the leg gathers is located within the width of the absorbent 23. In addition, the embodiment in which the stretchable sheet 53 is located within the width of the absorbent 23 includes not only the case in which the entire region of the stretchable sheet 53 in the transverse direction Y is located within the width of the absorbent 23, but also the case in which only a portion of the stretchable sheet 53 overlaps with the absorbent 23. FIG. 1 shows that the stretchable sheet 53 is positioned on a centerline (not shown) that extends along the longitudinal direction X of the diaper 1, and that the entire area of the stretchable sheet 53 in the lateral direction Y is located within the width of the absorbent body 23.

The second joint 42 is preferably spaced apart from the fixed end 3a of the leakage preventing cuff 3 in the lateral direction Y. In this way, when the leakage preventing cuff 3 is viewed in the lateral direction Y, the area between the second joint 42 and the fixed end 3a is not joined to the topsheet 21. Since the excrement temporarily stored in the internal space of the pocket P formed in the back portion B can pass through this non-joined area and move toward the crotch portion C of the diaper 1, the excrement can be absorbed in the crotch portion C of the absorbent body 23, and the entire area of the absorbent body 23 can be effectively used for absorbing excrement.
On the other hand, with regard to the first joint portion 41, the leakage preventing cuff 3 may be joined or not joined to the top sheet 21 between the first joint portion 41 and the fixed end portion 3a of the leakage preventing cuff 3. From the viewpoint of further preventing leakage of excrement from the ends of the diaper 1 in the longitudinal direction X, it is preferable that the leakage preventing cuff 3 is joined to the top sheet 21 between the first joint portion 41 and the fixed end portion 3a of the leakage preventing cuff 3.

It is preferable that the second joint 42 is located in the vertical direction X near the end 61a of the tape base 61 in the vertical direction X. This makes it easier to form the pocket P in the back portion B. This point will be described in detail below.

If the distance D1 (see FIG. 4) in the vertical direction X between the first joint 41 and the second joint 42 is too large, the contractile force of the leakage-proof cuff-forming elastic member 31 is not sufficiently transmitted to the leakage-proof cuff 3, making it difficult for the back portion B to bend and for a pocket P with sufficient internal space to be formed. On the other hand, if the distance D1 is too small, the size of the pocket P formed in the back portion B becomes small and the internal space of the pocket P becomes small. By setting the positional relationship between the position of the second joint 42 and the end portion 61a of the tape base 61 in the vertical direction X as described above, the back portion B becomes easier to bend and for a pocket P with sufficient internal space to be formed.
The position of the second joint 42 in the longitudinal direction X being located near the end 61a in the longitudinal direction X of the tape base 61 means that the distance D2 in the longitudinal direction X (see FIG. 4) between the end of the second joint 42 in the longitudinal direction X and the end 61a in the longitudinal direction X of the tape base 61 is 50 mm or less. Note that a case where the distance D2 is 0 mm, i.e., a case where the position of the second joint 42 overlaps with the position of the end 61a in the longitudinal direction X of the tape base 61, is also included in the embodiment where the position of the second joint 42 in the longitudinal direction X is located near the end 61a of the tape base 61. Note that in FIG. 4, the illustration of the leakage-proof cuff-forming elastic member 31, the leg gather elastic member 51, the absorber gather elastic member 52, and the waist gather elastic member 54 is omitted.

The distance D1 (see FIG. 4) is preferably 20 mm or more, more preferably 30 mm or more, and is preferably 100 mm or less, more preferably 80 mm or less, and is preferably 20 mm or more and 100 mm or less, more preferably 30 mm or more and 80 mm or less, from the viewpoint of making it easier to curve the back side portion B and easier to form a pocket P having sufficient internal space.

The length L1 (see FIG. 4) of the first joint 41 in the vertical direction X is preferably 30 mm or more, more preferably 35 mm or more, and is preferably 80 mm or less, more preferably 70 mm or less, and is preferably 30 mm or more and 80 mm or less, more preferably 35 mm or more and 70 mm or less, from the viewpoint of more firmly joining the free end 3b of the leakproof cuff 3 to the top sheet 21 and more easily curving the back side portion B.

The length L2 (see FIG. 4) of the first joint 41 in the lateral direction Y is preferably 20 mm or more, more preferably 25 mm or more, and also preferably 50 mm or less, more preferably 45 mm or less, and also preferably 20 mm or more and 50 mm or less, more preferably 25 mm or more and 45 mm or less, from the viewpoint of more firmly joining the free end 3b of the leakproof cuff 3 to the top sheet 21 and more easily curving the back side portion B.

The length L3 (see FIG. 4) of the second joint 42 in the vertical direction X is preferably 10 mm or more, more preferably 15 mm or more, and also preferably 50 mm or less, more preferably 45 mm or less, from the viewpoint of more firmly joining the free end 3b of the leakproof cuff 3 to the top sheet 21 and making it easier to curve the back side portion B. Also preferably 10 mm or more and 50 mm or less, more preferably 15 mm or more and 45 mm or less.

The length L4 (see FIG. 4) of the second joint 42 in the lateral direction Y is preferably 10 mm or more, more preferably 15 mm or more, and is preferably 40 mm or less, more preferably 35 mm or less, from the viewpoint of more firmly joining the free end 3b of the leakproof cuff 3 to the top sheet 21 and making it easier to curve the back side portion B. It is also preferably 10 mm or more and 40 mm or less, more preferably 15 mm or more and 35 mm or less.

The length H1 (see FIG. 4) of the stretchable sheet 53 in the vertical direction X is preferably 30 mm or more, more preferably 50 mm or more, and also preferably 150 mm or less, more preferably 120 mm or less, from the viewpoint of making it easier to bend the back side portion B and easier to form a pocket P with sufficient internal space, and also preferably 30 mm or more and 150 mm or less, more preferably 50 mm or more and 120 mm or less.

The length T (see FIG. 1) of the absorbent 23 in the lateral direction Y in the back portion B is preferably 200 mm or more, more preferably 220 mm or more, and is preferably 450 mm or less, more preferably 410 mm or less, and is preferably 200 mm or more and 450 mm or less, more preferably 220 mm or more and 410 mm or less, from the viewpoint of absorbing excrement temporarily stored in the internal space of the pocket P in the back portion B more easily.

As shown in FIG. 1, in the diaper 1, it is preferable that a plurality of elastic members 54 for waist gathers are arranged in a stretched state in the lateral direction Y at the end 1b of the diaper 1 in the back portion B. This allows the back portion B of the diaper 1 to be contracted along the lateral direction Y, and the shape of the pocket P formed in the back portion B tends to become more three-dimensional. As a result, leakage of excrement from the back side can be more effectively prevented. From the viewpoint of making this effect more pronounced, it is preferable that the elastic members 54 for waist gathers are arranged in the back core-free region Rb.

Next, the materials constituting the diaper 1 will be described.
The top sheet 21 may be a liquid-permeable sheet, such as a nonwoven fabric or a perforated film. The surface of the top sheet facing the skin may be uneven. For example, a plurality of scattered convex portions may be formed on the surface of the top sheet facing the skin. Alternatively, ridges and grooves extending in one direction may be alternately formed on the surface of the top sheet facing the skin. For such a purpose, the top sheet 21 may be formed using two or more sheets of nonwoven fabric.

On the other hand, the back sheet 22 may be, for example, a liquid-impermeable film or a spunbond, meltblown, or spunbond laminated nonwoven fabric. A liquid-impermeable film may be provided with a plurality of micropores to impart water vapor permeability to the film. In order to further improve the feel of the disposable diaper, a sheet with a good texture, such as a nonwoven fabric, may be laminated on the outer surface of the back sheet.

The absorbent core 24 is composed of, for example, a stack of hydrophilic fibers such as cellulose, starting with pulp, a mixed stack of the hydrophilic fibers and an absorbent polymer, a stack of absorbent polymer, a laminated structure in which an absorbent polymer is supported between two absorbent sheets, etc. The core wrap sheet 25 can be, for example, tissue paper made of hydrophilic fibers or a nonwoven fabric with liquid permeability.

The leak-proof cuffs 3 are preferably hydrophobic. This makes it possible to more effectively prevent lateral leakage of excrement such as urine, particularly excrement retained in the internal space of the pocket P. For example, hydrophobic nonwoven fabric can be used as the hydrophobic leak-proof cuffs 3. Specifically, air-through nonwoven fabric, spunbond nonwoven fabric, spunbond-meltblown-spunbond laminated nonwoven fabric, etc. can be used. In addition, hydrophobic resin films, laminates of such resin films and such nonwoven fabrics, etc. can be used.

As the elastic sheet 53, for example, (1) an elastic sheet having a stretchable fiber layer integrated on both sides or one side of an elastic fiber layer, (2) an elastic sheet having a stretchable fiber layer integrated on both sides or one side of a net-like elastic sheet, (3) an elastic sheet made of an elastic film having a stretchable fiber layer integrated on both sides or one side, and (4) an elastic sheet having a large number of elastic filaments arranged to extend in one direction without crossing each other and integrated into an extensible fiber layer, can be preferably used.
The "stretchable fiber layer" referred to here includes not only a fiber layer that is stretchable before being integrated with an elastic material, but also a fiber layer that is made stretchable by mechanical processing or the like after being integrated with an elastic material.
Methods for integrating the elastic fiber layer and the extensible fiber layer include, for example, a method of laminating them and entangling the fibers by water flow entangling or air through, or a method of bonding them by heat embossing, adhesives, ultrasound, etc.
The stretchable sheet 53 can be produced, for example, according to the method described in JP-A-2009-61743.

Although the disposable diaper of the present invention has been described above based on its preferred embodiment, the disposable diaper of the present invention is not limited to the above-mentioned embodiment. For example, the disposable diaper of the present invention may be a flat-type disposable diaper for infants or adults, or a pants-type disposable diaper that does not have a fastening structure such as a fastening tape and a fastening region. A pants-type disposable diaper that does not have a fastening structure typically has both side edges along the vertical direction of the abdominal side and dorsal side portions joined together, thereby forming a pair of side seal portions, a waist opening, and a pair of leg openings.

In addition, in the above embodiment, the fastening tape 6 is provided with two pairs of fastening portions 62a on the left and right, but instead, only one pair of fastening portions 62a may be provided.

The planar shape of the first joint 41 and the second joint 42 is not limited to a rectangular shape, but may be a circle, an ellipse, a polygon, a "dogbone" or "hourglass" shape, a star shape, a lattice shape, or the like. The first joint 41 and the second joint 42 may be made up of a plurality of joints arranged in a dot, stripe, lattice, ellipse, star, bow, or other shape.

The first joint 41 may also be spaced apart from the edge of the back portion B of the diaper 1 toward the crotch portion C in the longitudinal direction X.

In the abdominal portion A, the third joint 43 joining the free end 3b of the leak-proof cuff 3 to the top sheet 21 may be divided into a joint located at the end 1a of the diaper 1 and a joint spaced apart from the joint in the longitudinal direction X. In this case, the joint spaced apart from the joint located at the end 1a of the diaper 1 may be located closer to the crotch portion C than the edge 24a of the absorbent core 24, or may be located closer to the end 1a of the diaper 1 than the edge 24a.

The planar shape of the absorber 23 is not limited to a rectangular shape, but may be an hourglass shape with the center in the vertical direction X narrowed inward in the horizontal direction Y.

REFERENCE SIGNS LIST 1 disposable diaper 2 absorbent body 21 top sheet 22 back sheet 23 absorbent body 24 absorbent core 25 core wrap sheet 3 leak-proof cuff 31 elastic member for forming leak-proof cuff 41 first joining portion 42 second joining portion 51 elastic member for leg gathers 52 elastic member for absorbent body gathers 53 stretchable sheet A abdominal portion B back portion C crotch portion X longitudinal direction Y lateral direction

Claims (6)

The absorbent body includes an absorbent core, a top sheet arranged on the skin-facing side of the absorbent core, and a back sheet arranged on the non-skin-facing side of the absorbent core,
An absorbent article having a ventral side portion disposed on the ventral side of a wearer, a dorsal side portion disposed on the dorsal side of the wearer, and a crotch portion located between the ventral side portion and the dorsal side portion, the absorbent article having a longitudinal direction extending from the ventral side portion through the crotch portion to the dorsal side portion and a lateral direction perpendicular to the longitudinal direction,
The absorbent article has a region where the absorbent core is not present outside an end edge of the absorbent core in the longitudinal direction of the rear side portion,
The absorbent body has leak-proof cuffs arranged on both sides along the longitudinal direction,
The leakage preventing cuff has a fixed end and a free end, and a leakage preventing cuff forming elastic member is arranged in a stretched state along the longitudinal direction at an inner end of the free end in the lateral direction,
In the back side portion, the free end portions of the leakage preventing cuffs are folded inward in the lateral direction and joined to the topsheet at a first joint portion located at an end portion in the longitudinal direction of the absorbent article and a second joint portion spaced away from the first joint portion toward the crotch portion in the longitudinal direction,
the leakage-preventive cuff-forming elastic member is disposed between the first and second joining portions in the longitudinal direction, and the leakage-preventive cuff-forming elastic member overlaps with the first and second joining portions;
The second joint portion is located closer to the crotch portion than the edge of the absorbent core ,
An absorbent article , wherein in the lateral direction, the second joining portion is spaced from the fixed end portion of the leak-proof cuff . a stretchable member other than the leakage-preventing cuff-forming elastic member is disposed between a first joining portion and a second joining portion in the longitudinal direction of the absorbent article;
The elastic member is
(1) An elastic member for leg gathers is arranged in a stretched state along a side portion of the absorbent article in the longitudinal direction;
2) an elastic member for absorbent gathers that is positioned within the width of the absorbent and arranged in a stretched state along the longitudinal direction; and (3) a stretchable sheet that stretches in the longitudinal direction. The absorbent article according to claim 1, The absorbent article according to claim 2, wherein the elastic member is at least one member selected from the elastic member for the leg gathers and the elastic member for the absorbent body gathers. The elastic member is the elastic member for absorbent body gathers or the elastic sheet,
The absorbent article according to claim 2 , wherein the elastic members for gathers of the absorbent body or the stretchable sheet are positioned within the width of the absorbent body. The absorbent article according to any one of claims 1 to 4, wherein an elastic member for waist gathering is arranged in a stretched state in the lateral direction at the end of the absorbent article in the back side portion. A pair of fastening tapes is provided on both side edges of the back portion along the longitudinal direction,
The fastening tape includes a tape base portion joined to the absorbent body, and a tape gripping portion connected to the tape base portion and extending outward in the lateral direction,
The absorbent article according to any one of claims 1 to 5, wherein the end portion of the second joint portion on the crotch side in the longitudinal direction is located in the vicinity of the end portion of the tape base on the crotch side in the longitudinal direction.

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