absorbent articles

Abstract

The absorbent article (1) has mutually perpendicular vertical directions, lateral directions, and thickness directions, and comprises an absorbent body (11), the absorbent body (11) including an absorbent core (12), a first sheet portion (13bp) covering the absorbent core (12) from one side in the thickness direction, and a second sheet portion (13ap) covering the absorbent core (12) from the other side in the thickness direction. The absorbent article (1) is characterized in that the absorbent core (12) includes a through hole (12H) penetrating in the thickness direction, and a first joining portion and a second joining portion joining the first sheet portion (13bp) and the second sheet portion (13ap) are provided inside the through hole (12H) in a plan view, and the second joining portion is spaced apart from the first joining portion by a predetermined distance in the lateral direction.

Description

Technical Field

[0001] The present invention relates to an absorbent article. Background Art

[0002] Generally, absorbent articles are known to have an absorbent body, and the absorbent body includes an absorbent core and a core wrapping sheet covering the absorbent core. For example, Patent Document 1 discloses an absorbent article in which a non-fiber deposition portion is provided that penetrates the absorbent core in the thickness direction in order to enhance the diffusibility of discharged fluid and promote deformation of the absorbent core to conform to the wearer's body. Furthermore, in order to enhance the shape retention of the absorbent core, a skin-side core wrapping sheet and a non-skin-side core wrapping sheet are joined in the non-fiber deposition portion to enhance the shape retention of the absorbent core.

[0003] Prior art literature

[0004] Patent Literature

[0005] Patent Document 1: Japanese Patent Application Laid-Open No. 2016-083194 Summary of the Invention

[0006] Problems to be solved by the invention

[0007] However, in the absorbent article of Patent Document 1, the portion where the skin-side core wrap sheet and the non-skin-side core wrap sheet are joined in the non-fiber deposition portion is joined using an adhesive, etc. This leads to a risk of reduced absorbency or reduced diffusion of excrement in the non-fiber deposition portion.

[0008] The present invention has been made in view of the above problems, and an aspect of the present invention is to provide an absorbent article that enhances absorbency and promotes longitudinal diffusion of excrement while enhancing conformity to the wearer's body and shape retention of the absorbent core.

[0009] Solutions for solving problems

[0010] The main aspect of the present invention for achieving the above-mentioned purpose is an absorbent article, which has longitudinal, lateral and thickness directions orthogonal to each other, and the absorbent article includes: an absorbent body, which includes: an absorbent core; a first sheet portion, which covers the absorbent core from one side of the thickness direction; and a second sheet portion, which covers the absorbent core from the other side of the thickness direction, the absorbent core includes a through hole passing through the thickness direction, in a plan view, the absorbent article has a first joining portion and a second joining portion on the inner side of the through hole, each of the first joining portion and the second joining portion is a portion where the first sheet portion and the second sheet portion are joined, and in the plan view, the second joining portion is spaced apart from the first joining portion by a predetermined distance in the lateral direction.

[0011] Features of the present invention other than the above will become apparent by reading the description of this specification with reference to the accompanying drawings.

[0012] Effects of the Invention

[0013] According to the present invention, it is possible to provide an absorbent article that promotes the diffusion of excrement in the longitudinal direction while enhancing conformity to the wearer's body and shape retention of the absorbent core. BRIEF DESCRIPTION OF THE DRAWINGS

[0014] [ Figure 1 ] Figure 1 It is a schematic perspective view of the pants-type disposable diaper 1.

[0015] [ Figure 2 ] Figure 2 is a schematic plan view of the diaper 1 in an unfolded and stretched state when viewed from the skin side.

[0016] [ Figure 3 ] Figure 3 It is along Figure 2 Schematic cross-sectional view taken along arrow AA in FIG.

[0017] [ Figure 4 ] Figure 4 It is an explanatory diagram showing the non-skin side sheet 13b.

[0018] [ Figure 5 ] Figure 5 A is Figure 3 Magnified view of portion X in FIG. Figure 5 B is Figure 5 Magnified view of portion Y in A.

[0019] [ Figure 6 ] Figure 6 A is an explanatory diagram illustrating an application area of ​​the adhesive g of the diaper 1 . Figure 6 B is an explanatory diagram illustrating an application area of ​​the adhesive g of the diaper 1 in another embodiment. Figure 6 C is an explanatory diagram illustrating an application area of ​​the adhesive g of the diaper 1 in another embodiment.

[0020] [ Figure 7 ] Figure 7 It is along Figure 2 Schematic cross-sectional view of the absorbent body 11 taken along arrow BB in FIG.

[0021] [ Figure 8 ] Figure 8 A is according to another embodiment Figure 3 Part X in FIG. 1 is an enlarged view of the portion corresponding to FIG. Figure 8 B is according to yet another embodiment Figure 3Part X in FIG. 1 is an enlarged view of the portion corresponding to FIG.

[0022] Figure 8 C is according to yet another embodiment Figure 3 Part X in FIG. 1 is an enlarged view of the portion corresponding to FIG. DETAILED DESCRIPTION

[0023] At least the following matters will become clear from the description of this specification and the accompanying drawings.

[0024] An absorbent article having longitudinal, lateral and thickness directions orthogonal to each other, the absorbent article comprising: an absorbent body comprising: an absorbent core; a first sheet portion covering the absorbent core from one side in the thickness direction; and a second sheet portion covering the absorbent core from the other side in the thickness direction, the absorbent core comprising a through hole extending through the thickness direction, wherein in a plan view, the absorbent article has a first joining portion and a second joining portion inside the through hole, each of the first joining portion and the second joining portion being a portion where the first sheet portion and the second sheet portion are joined, and in the plan view, the second joining portion is spaced apart from the first joining portion by a predetermined distance in the lateral direction.

[0025] According to the absorbent article, the absorbent core is more easily deformed due to the provision of through-holes, thereby enhancing conformability to the wearer's body. While the shape retention of the absorbent core is enhanced, the presence of a non-joined portion between the first sheet and the second sheet within the through-holes enhances absorbency. This facilitates the longitudinal diffusion of excrement.

[0026] In such an absorbent article, it is desired that the first sheet portion has a plurality of protrusions protruding in the thickness direction at least on the surface of the first sheet portion facing the second sheet portion inside the through hole, and the protrusions and the second sheet portion are joined by each of the first joining portion and the second joining portion.

[0027] According to the absorbent article, the first sheet portion having the plurality of protrusions makes it easier to provide a space in the region where the first and second joining portions corresponding to the respective protrusions are spaced apart from each other in the transverse direction. The space provided in the transverse direction between the first and second joining portions enhances absorbency, making it easier for excrement to move in the longitudinal direction.

[0028] In such an absorbent article, it is desirable that the first sheet portion has a plurality of convex portions on both side surfaces in the thickness direction.

[0029] According to the above absorbent article, providing the convex portions on both sides of the first sheet makes it easier for excrement to spread in the longitudinal direction not only on the surface facing the second sheet but also on the surface opposite to the surface facing the second sheet.

[0030] In such an absorbent article, it is desirable that the fiber density of the central portion of the convex portion in the transverse direction is higher than the fiber density of the side end portions of the convex portion in the transverse direction.

[0031] According to the absorbent article, the transverse center portion of the protrusion is more likely to be located at a position corresponding to the first joining portion. In addition, compared to a case where the fiber density of the transverse center portion of the protrusion is lower than the fiber density of the transverse side ends of the protrusion, the joining between the first joining portion and the second joining portion can be further strengthened.

[0032] In such an absorbent article, it is desirable that the average height of the projections on the surface of the second sheet portion facing the first sheet portion inside the through-hole is lower than the average height of the projections on the surface of the first sheet portion facing the second sheet portion.

[0033] According to the absorbent article described above, compared to a case where the second sheet portion has the same convex portion as that of the first sheet portion, the joining between the first joining portion and the second joining portion can be further strengthened.

[0034] In such an absorbent article, it is desired that the first sheet portion has a plurality of first sheet protrusions protruding in the thickness direction on the surface of the first sheet portion facing the second sheet portion on the inside of the through hole in the plan view, and the second sheet portion has a plurality of second sheet protrusions protruding in the thickness direction on at least the surface of the second sheet portion facing the first sheet portion on the inside of the through hole in the plan view, and the first sheet protrusions and the second sheet portion are joined by each of the first joining portion and the second joining portion, or the second sheet protrusions and the first sheet portion are joined by each of the first joining portion and the second joining portion.

[0035] According to the absorbent article, since both the first sheet and the second sheet have convex portions, the thickness of the sheet can be increased. This makes it easier for excrement to be absorbed in the through holes, thereby reducing the risk of the absorbed excrement returning to the skin side.

[0036] In such an absorbent article, it is desired that the absorbent article has, on the inner side of the through hole,: a first joining portion; a second joining portion; and another joining portion, in which at least one or more parts of the first sheet and the second sheet are joined, and the other joining portion is spaced apart from the first joining portion and the second joining portion in the transverse direction.

[0037] According to the absorbent article, while further strengthening the joining of the first sheet and the second sheet inside the through hole, excrement is more likely to spread in the longitudinal direction in the region where the first joining portion, the second joining portion, and the further joining portion are spaced apart from each other.

[0038] In such an absorbent article, it is desired that the through hole extends along the longitudinal direction, and inside the through hole, the first sheet portion has a plurality of protrusions on at least the surface of the first sheet portion facing the second sheet portion, the plurality of protrusions are in contact with the second sheet portion and protrude in the thickness direction, and two protrusions adjacent to each other in the transverse direction are spaced apart in the transverse direction and extend along the longitudinal direction.

[0039] According to the above-mentioned absorbent article, on the inner side of the through hole having a shape extending in the longitudinal direction, the convex portion of the first sheet portion in contact with the second sheet portion extends in the longitudinal direction, so the area between the first joint portion and the second joint portion in the transverse direction tends to become an area extending in the longitudinal direction, making it easier for excrement to spread in the longitudinal direction inside the through hole.

[0040] In such an absorbent article, it is desirable that a distance in the longitudinal direction between the two convex portions and the second sheet portion at a point where the two convex portions come into contact with each other inside the through-hole is longer than the predetermined distance.

[0041] According to the absorbent article, compared to a case where the longitudinal distance between the two protrusions and the second sheet portion is equal to or shorter than the transverse distance (predetermined distance) between the first and second joining portions, the transverse region between the first and second joining portions is more likely to maintain its longitudinally extending shape. This makes it easier for excrement to spread longitudinally.

[0042] In such an absorbent article, it is desirable that one side in the thickness direction is the non-skin side, the other side in the thickness direction is the skin side, and the first sheet portion is the non-skin side sheet portion located on the non-skin side relative to the absorbent core.

[0043] According to the absorbent article, the non-skin side sheet portion located on the non-skin side relative to the absorbent core has a first joining portion and a second joining portion spaced apart from each other by a predetermined distance in the transverse direction. This makes it easier for excrement absorbed from the skin side of the through-hole to remain in the area where the first joining portion and the second joining portion are spaced apart from each other. This reduces the risk of excrement, once absorbed by the absorbent body, returning to the wearer's skin side.

[0044] In such an absorbent article, it is desirable that the first joining portion and the second joining portion are provided on the skin side with respect to the center of the absorbent core in the thickness direction.

[0045] According to the above-mentioned absorbent article, compared with the case where the first joining portion and the second joining portion are arranged in the center in the thickness direction, the absorbent body is recessed more deeply from the non-skin side toward the skin side, so when the wearer observes the absorbent article from the non-skin side, it is easy to identify the existence of the through hole.

[0046] In such an absorbent article, it is desirable that an adhesive is provided in at least one of the first sheet portion and the second sheet portion, and the adhesive is provided so as to be continuous in the transverse direction.

[0047] According to the absorbent article described above, the first joining portion and the second joining portion are more easily formed. In addition, in the region where the first joining portion and the second joining portion are spaced apart from each other, the absorbency is enhanced, and excrement is more easily spread in the longitudinal direction.

[0048] In such an absorbent article, it is desirable that the spacing distance between the first joining portion and the second joining portion in the lateral direction is shorter than a length obtained by dividing the sum of the length of the first joining portion and the length of the second joining portion by 2.

[0049] According to the absorbent article described above, the area of ​​the joining portion can be made larger compared to a case where the spacing distance between the first joining portion and the second joining portion is longer than the length obtained by dividing the sum of the length of the first joining portion and the length of the second joining portion by 2. This can further strengthen the joining between the first sheet portion and the second sheet portion.

[0050] In such an absorbent article, it is desirable that the spacing distance between the first joining portion and the second joining portion in the lateral direction is longer than a length obtained by dividing the sum of the length of the first joining portion and the length of the second joining portion by 2.

[0051] According to the above absorbent article, the region of the joining portion can be narrowed compared to a case where the spacing distance between the first joining portion and the second joining portion is shorter than the length obtained by dividing the sum of the length of the first joining portion and the length of the second joining portion by 2. This can reduce the rigidity of the region of the absorbent body where the through hole is provided, making it easier for the absorbent body to deform from the through hole and conform to the wearer's body.

[0052] In such an absorbent article, it is desired that at least one longitudinal end of the first sheet and the second sheet are positioned outside one longitudinal end of the absorbent core, and on one side in the longitudinal direction, the end of the first sheet and the end of the second sheet are continuously joined in the transverse direction.

[0053] According to the absorbent article described above, the region where the first joining portion and the second joining portion are spaced apart from each other can reduce the risk of excrement that has spread in the longitudinal direction leaking from the longitudinal end portions of the absorbent body.

[0054] In such an absorbent article, it is desirable that the absorber includes a pair of through holes at a central portion when the absorber is divided into three in the longitudinal direction, and the pair of through holes are provided on one and the other sides of the absorber in the transverse direction.

[0055] According to the above absorbent article, the absorbent article is easily arranged in the crotch of the wearer, so that the absorbent body can be deformed more easily according to the movement of the wearer.

[0056] ===Implementation Method===

[0057] The absorbent article using the absorbent body according to this embodiment is described below using a so-called shorts-type disposable diaper (hereinafter also referred to as "diaper 1") as an example. It should be noted that absorbent articles are not limited to shorts-type disposable diapers, and examples thereof include belt-type disposable diapers, sanitary napkins, absorbent pads, disposable diapers for pets, and absorbent pads for pets. Disposable diapers, absorbent pads, etc. can be used for infants or adults. It should be noted that excreta refers to excreta of living organisms including not only humans but also animals. Examples of excreta include sweat, urine, feces, menstrual blood, vaginal secretions, breast milk, blood, and exudate.

[0058] ===Basic Structure of Pants-Type Disposable Diaper 1===

[0059] Figure 1 It is a schematic perspective view of the pants-type disposable diaper 1. Figure 2 is a schematic plan view of the diaper 1 in an unfolded and stretched state when viewed from the skin side. Figure 3 It is along Figure 2 Schematic cross-sectional view taken along arrow AA in FIG. The "expanded state" refers to a state in which the side portions 30a of the ventral member 30 and the side portions 40a of the dorsal member 40, which form the two side portions of the diaper 1, are separated from each other and spread out (welded portions SS) so that the diaper 1 is completely unfolded and flat. The "stretched state" refers to a state in which the elastic members of the diaper 1 are stretched to a degree where wrinkles are no longer visible in the diaper 1. Specifically, the stretched state refers to a state in which the diaper 1 is stretched so that the dimensions of its constituent members (e.g., the ventral member 30, described later, etc.) match or approach the dimensions of the members themselves. Figure 2 The line CC in the middle is the center line in the transverse direction, and the line CL is the center line in the longitudinal direction in the unfolded state. Figure 3 In the figure, for convenience, the adhesive is omitted. In addition, for convenience, the dotted line represents the visually recognizable portion of the cross section of the absorbent core 12 located on the ventral side in the longitudinal direction. It should be noted that in the following description, the diaper 1 will be described in an unfolded and stretched state, but the diaper 1 can be in a natural state.

[0060] like Figure 1As shown, the pants-type diaper 1 has an up-down direction, a lateral direction, and a front-back direction, and the diaper 1 includes a waist opening BH and a pair of leg openings LH formed in the diaper 1 . Figure 2 The up-down direction of the diaper 1 in the unfolded and stretched state will be referred to as the "longitudinal direction", one side in the longitudinal direction will be referred to as the "abdominal side", and the other side will be referred to as the "dorsal side". In the front-back direction, the side corresponding to the wearer's abdomen is the front side, and the side corresponding to the wearer's back is the rear side. In addition, the diaper 1 has the following features: Figure 3 In the thickness direction shown, the side in contact with the wearer with respect to the thickness direction is defined as the skin side, and the side opposite to the skin side is defined as the non-skin side.

[0061] The diaper 1 is a so-called three-piece diaper and includes an absorbent body 10, a ventral member 30, and a dorsal member 40. The ventral member 30 and the dorsal member 40 are substantially rectangular in plan view, with their longitudinal directions aligned with the lateral direction. The ventral member 30 covers the wearer's ventral side, and the dorsal member 40 covers the wearer's dorsal side. The absorbent body 10 is substantially rectangular in plan view. The ventral and dorsal ends of the absorbent body 10 overlap the skin-facing sides of the ventral and dorsal members 30 and 40, respectively.

[0062] like Figure 2 As shown, the diaper 1 in the unfolded and stretched state is bilaterally symmetrical about the center line CC. The non-skin-facing sides of the ventral and dorsal ends of the absorbent body 10 are joined to the skin-facing sides of the ventral and dorsal members 30, 40 using an adhesive or the like (not shown). The absorbent body 10 is folded in half so that the ventral and dorsal members 30, 40 face each other. The transverse side portions 30a of the ventral member 30 are welded to the transverse side portions 40a of the dorsal member 40 and joined to the side welds SS, thereby obtaining the diaper 1 in a shorts-type state.

[0063] The ventral member 30 and the dorsal member 40, respectively, include skin-side sheets 31, 41 and non-skin-side sheets 32, 42, made of soft nonwoven fabric or the like, and a plurality of laterally stretchable elastic cords 35, 45. The elastic cords 35, 45 are arranged side by side, spaced apart in the vertical direction, and secured between a pair of sheets (31, 32, 41, 42) while being stretched in the laterally direction. Thus, the ventral member 30 and the dorsal member 40 can stretch in the laterally direction, thereby fitting snugly around the wearer's waist.

[0064] The skin side sheet 31, the elastic cord 35, and the non-skin side sheet 32 ​​are sequentially stacked in the thickness direction on the skin side of the abdominal member 30, and these members are bonded to each other by using an adhesive such as a hot melt adhesive. Similarly, the skin side sheet 41, the elastic cord 45, and the non-skin side sheet 42 are sequentially stacked in the thickness direction on the skin side of the back member 40, and these members are bonded to each other by using an adhesive such as a hot melt adhesive.

[0065] The skin side sheets 31 and 41 and the non-skin side sheets 32 and 42 are all sheets made of non-woven fabrics, specifically sheets made of spunbond non-woven fabrics. However, there is no limitation thereto, and SMS (spunbond / meltblown / spunbond) non-woven fabrics or the like can be used. It should be noted that the skin side sheets 31 and 41 and the non-skin side sheets 32 and 42 are not all required to be non-woven fabric sheets, and it is possible that the skin side sheets 31 and 41 or the non-skin side sheets 32 and 42 are soft sheet members made of materials other than non-woven fabrics.

[0066] The absorbent body 10 includes a front sheet 14, an absorbent body 11, and a back sheet 15 bonded together using an adhesive such as a hot melt adhesive. The front sheet 14 only needs to be a liquid-permeable sheet, and examples thereof include a hydrophilic breathable nonwoven sheet and a spunbond nonwoven sheet. The back sheet 15 only needs to be a liquid-impermeable sheet, and examples thereof include a polyethylene film, a polypropylene film, and a hydrophobic SMS nonwoven fabric. The front sheet 14 and the back sheet 15 have a size large enough to cover the entire absorbent body 11.

[0067] The absorbent body 10 includes leg gathers LG, which are located at the transverse ends and stretch in the longitudinal direction, and barrier cuffs LSG, which are located on the skin side relative to the absorbent body 11 and serve as leak-proof walls to prevent transverse leakage. The leg gathers LG and barrier cuffs LSG respectively include elastic members 17 and 18 that stretch in the longitudinal direction (vertical direction).

[0068] ===Absorber 11===

[0069] The absorbent body 11 has a substantially rectangular shape in a plan view and has a bilaterally symmetrical shape with respect to the center line CC. The absorbent body 11 includes an absorbent core 12 that absorbs liquid and a liquid-permeable core wrapping sheet 13 that covers the absorbent core 12 from the skin side and the non-skin side in the thickness direction.

[0070] For example, the liquid absorbent material constituting the absorbent core 12 may be formed of liquid absorbent fibers such as pulp fibers or liquid absorbent particles such as superabsorbent polymers (so-called SAPs). In addition, the absorbent core may contain liquid absorbent materials excluding liquid absorbent fibers or liquid absorbent particles. Figure 3 In the figure, the center 12 c is the center of the absorptive core 12 in the thickness direction.

[0071] The absorbent core 12 has a through hole 12H extending through the core 12 in the thickness direction. Figure 2 As shown in Figures 1 and 2, it is preferred that the absorbent core 12 has a bilaterally symmetrical shape and includes a pair of through-holes 12H, with each through-hole 12H having substantially the same shape. Furthermore, it is preferred that the pair of through-holes 12H be located on one and the other sides of the absorbent body 11 in the transverse direction, and in the center portion of the absorbent body 11 when the absorbent body 11 is divided into three parts in the longitudinal direction. This makes it easier to position the pair of through-holes 12H in the crotch area of ​​the wearer when the diaper is put on, thereby making it easier for excrement to diffuse through the portion through which the absorbent core 12 is inserted. Furthermore, since the absorbent body 11 is more easily folded away from the position of the pair of through-holes 12H, it is easier for the absorbent body to follow the wearer's movements.

[0072] The longitudinal length of the through hole 12H is 30 to 500 mm, preferably 75 to 350 mm, more preferably 100 to 250 mm. The transverse length of the through hole 12H is 3 to 20 mm, preferably 4 to 15 mm, more preferably 5 to 12 mm. The through holes 12H of this embodiment all have a substantially rectangular shape with a longitudinal length of 180 mm and a transverse length of 10 mm. Figure 2 As shown, the through holes 12H each have a substantially rectangular shape extending in the longitudinal direction, and preferably have a shape extending in the longitudinal direction.

[0073] The diaper 1 includes a skin side sheet 13a and a non-skin side sheet 13b as a core wrap sheet 13. The transverse length of the skin side sheet 13a is substantially equal to the transverse length of the absorbent core 12, and its longitudinal length is greater than the longitudinal length of the absorbent core 12. The transverse length of the non-skin side sheet 13b is greater than the transverse length of the absorbent core 12, and both transverse end portions of the non-skin side sheet 13b are folded inward in the transverse direction and overlapped on the skin side relative to the absorbent core 12 and overlapped on the skin side relative to the skin side sheet 13a.

[0074] Each of the skin side sheet 13a and the non-skin side sheet 13b is a sheet member formed of a hydrophilic SMS non-woven fabric. It should be noted that as each of the skin side sheet 13a and the non-skin side sheet 13b, a hydrophilic water-permeable sheet member such as tissue paper, hydrophilic spunbond non-woven fabric, or hydrophilic breathable non-woven fabric can be used. The skin side sheet 13a of this embodiment has a thickness of approximately 1.0 mm, and both surfaces of the skin side sheet 13a are substantially flat. The portion of the skin side sheet 13a that covers the absorbent core 12 from the skin side in the thickness direction will be referred to as the "skin side sheet portion 13ap", and the portion of the non-skin side sheet 13b that covers the absorbent core 12 from the non-skin side in the thickness direction will be referred to as the "non-skin side sheet portion 13bp".

[0075] In the non-skin side sheet portion 13bp, the surface (skin side) facing the skin side sheet portion 13ap has a convex portion (skin side convex portion 13bx) protruding in the thickness direction (skin side). Figure 4 As shown in FIG. 1 and FIG. 2 , convex portions protruding in the thickness direction are provided on both surfaces of the non-skin side sheet 13b. Figure 4 It is an explanatory diagram showing the non-skin side sheet 13b. Figure 4 It is taken out and unfolded Figure 3 , etc. are cross-sectional views of a portion of the non-skin side panel 13b.

[0076] like Figure 4 As shown, the non-skin side sheet 13b has multiple protrusions that protrude toward the skin side or the non-skin side in the thickness direction. Specifically, the length of the non-skin side sheet 13b in the thickness direction is length 13T. Skin-side protrusions 13bx and non-skin-side protrusions 13by are arranged throughout the entire area. The skin-side protrusions 13bx are located on the skin side relative to the center ct of the non-skin side sheet 13b in the thickness direction and protrude toward the skin side. The non-skin-side protrusions 13by are located on the non-skin side relative to the center ct and protrude toward the non-skin side. At this time, the skin-side protrusions 13bx and the non-skin-side protrusions 13by extend longitudinally. Therefore, when observing the non-skin side sheet 13b from the skin side, the skin-side protrusions 13bx protruding toward the skin side and the grooves (also called "recesses") that are recessed toward the non-skin side are alternately arranged in the transverse direction. The grooves that are recessed toward the non-skin side also serve as the non-skin-side protrusions 13by that protrude toward the non-skin side when observing the non-skin side sheet 13b from the non-skin side. The skin-side convex portions 13bx and the non-skin-side convex portions 13by extend longitudinally. The skin-side convex portions 13bx and the non-skin-side convex portions 13by of the non-skin side sheet 13b have equal transverse lengths. Furthermore, among the skin-side convex portions 13bx and the non-skin-side convex portions 13by that alternate in the transverse direction, the skin-side convex portions 13bx and the non-skin-side convex portions 13by that are adjacent to each other in the transverse direction are continuous.

[0077] like Figure 4 As shown, in the non-skin side sheet 13b, the distances 13P between the transverse centers of the skin-side convex portions 13bx located at transversely adjacent positions are equidistant, and the distances 13P between the transverse centers of the plurality of non-skin-side convex portions 13by are also equidistant.

[0078] It is preferred that, among the fibers constituting the skin-side convex portion 13bx, the fiber density of the transverse central portion bm of the skin-side convex portion 13bx is higher than the fiber density of the transverse side end portion br of the skin-side convex portion 13bx. For example, in the non-skin side sheet 13b of the present embodiment, the skin-side convex portion 13bx and the non-skin-side convex portion 13by are formed by passing the non-skin side sheet 13b between a pair of rotating gear rollers in a state where the outer peripheral surfaces of the pair of gear rollers face each other. The pair of gear rollers respectively have convex portions and concave portions on the outer peripheral surfaces, and are set so that the concave portion of one gear roller engages with the convex portion of the other gear roller. As Figure 4 As shown, the non-skin side sheet 13b, which passes through the roller mechanism, has skin-side convex portions 13bx and non-skin-side convex portions 13by arranged alternately along the lateral direction of the diaper 1. In this case, the side ends br become areas that stretch more than the central portion bm, so the fiber density of the central portion bm is higher than that of the side ends br. Similarly, the fiber density of the lateral central portion of the non-skin-side convex portions 13by is higher than that of the lateral ends br of the non-skin-side convex portions 13by.

[0079] like Figure 2 As shown, in a plan view, that is, when the diaper 1 (absorbent body 11) is viewed from the skin side in the thickness direction, the skin side sheet portion 13ap and the non-skin side sheet portion 13bp are joined on the inner side of each through hole 12H. By joining the skin side sheet portion 13ap and the non-skin side sheet portion 13bp on the inner side of each through hole 12H, the shape retention of the absorbent core 12 can be enhanced regardless of whether the through hole 12H is provided. The term "inner side of the through hole 12H" refers to the inner side of the through hole 12H in a plan view (when viewed from the skin side or the non-skin side of the diaper 1) and the inner side of the area surrounded by the edge in which the through hole 12H is formed in the plan view.

[0080] like Figure 4 As shown in FIG. 1 , the central portion bm, which has a higher fiber density, is located on the skin side relative to the side ends br. The central portion bm of the non-skin side sheet 13b, located closer to the skin side sheet 13a in the thickness direction, has a higher fiber density than the side ends br. This allows the adhesive to further strengthen the bond between the skin side sheet 13a and the non-skin side sheet 13b inside the through-holes 12H. Therefore, since the bond between the skin side sheet 13a and the non-skin side sheet 13b inside the through-holes 12H can be further strengthened, the shape retention of the absorbent core 12 in response to the wearer's movements can be enhanced.

[0081] The following describes the bonding inside the through-hole 12H in plan view. Figure 5 A is Figure 3 Magnified view of portion X in FIG. Figure 5 B is Figure 5 A is an enlarged view of part Y. Figure 5 A and Figure 5 As shown in FIG. 1B , inside the through hole 12H, the skin side sheet 13ap and the non-skin side sheet 13bp are joined by a plurality of joining portions G. Hereinafter, among the plurality of joining portions G provided inside the through hole 12H, a first joining portion G1 and a second joining portion G2 adjacent to each other in the transverse direction will be described.

[0082] Conventionally, it is known to provide through-holes 12H in the absorbent core 12 in order to enhance the conformability of the absorbent core 12 to the wearer's body. Providing through-holes 12H creates the risk of the shape of the absorbent core 12 collapsing. In this regard, in order to enhance the shape retention of the absorbent core 12, it is known to join the skin-side sheet 13ap and the non-skin-side sheet 13bp of the core wrapping sheet 13 facing each other inside the through-holes 12H. This joining between the skin-side sheet 13ap and the non-skin-side sheet 13bp is typically formed using an adhesive such as a hot melt adhesive, which creates the risk of reduced absorbency of excrement at the joined portion where the skin-side sheet 13ap and the non-skin-side sheet 13bp are joined.

[0083] In contrast, in the diaper 1 of the present embodiment, at least the first joint G1 and the second joint G2 are set to the joint G in the through hole 12H in plan view. The first joint G1 and the second joint G2 are spaced apart from each other in the horizontal direction with a predetermined distance (interval distance DG). That is, in the through hole 12H inboard, there is the part (the first joint G1 and the second joint G2) that the skin side sheet portion 13ap and the non-skin side sheet portion 13bp engage, and there is a non-joint portion between the skin side sheet portion 13ap and the non-skin side sheet portion 13bp. Therefore, while the shape of the enhanced absorbent core 12 along the compliance of the wearer's body and the through hole 12H is maintained, the non-joint portion positioned between the first joint G1 and the second joint G2 in the horizontal direction can reduce the risk of hindering the absorption of excrement due to the engagement between the skin side sheet portion 13ap and the non-skin side sheet portion 13bp. In addition, it is easier to provide the path used for excrement between the first joint G1 and the second joint G2, promote excrement to diffuse longitudinally. In particular, it is common for the absorbent core 12 of an absorbent article such as the diaper 1 to have a longitudinal length greater than its transverse length. Therefore, to reduce the risk of excrement leaking outward in the transverse direction, it is desirable that excrement, once absorbed by the absorbent core 12, spreads longitudinally rather than transversely. Therefore, because the first joining portion G1 and the second joining portion G2 are spaced apart from each other in the transverse direction, absorbed excrement is more likely to spread longitudinally, reducing the risk of excrement leaking outward in the transverse direction of the absorbent core 12 (diaper 1).

[0084] In the configuration in which the first joining portion G1 and the second joining portion G2 are spaced apart from each other at a predetermined distance in the transverse direction, the diaper 1 has a skin-side convex portion (first sheet convex portion) 13bx that protrudes toward the skin side in the thickness direction on the surface of the non-skin side sheet portion (first sheet portion) 13bp facing the skin-side sheet portion (second sheet portion) 13ap. In addition, the skin-side convex portion 13bx of the non-skin side sheet portion 13bp is joined to the skin-side sheet portion 13ap. Specifically, as Figure 4 As shown in FIG. 1 , the non-skin side sheet 13b includes a skin side convex portion 13bx protruding toward the skin side. Figure 5 As shown in FIG. 1A , in this non-skin side sheet 13b, on the surface facing the skin side sheet 13ap inside the through-hole 12H, the non-skin side sheet portion 13bp has a plurality of skin-side convex portions 13bx protruding in the thickness direction, and the skin-side convex portions 13bx and the skin-side sheet portion 13ap are joined together. Due to the skin-side convex portions 13bx of the non-skin side sheet portion 13bp, first joining portions G1 and second joining portions G2 spaced apart from each other in the transverse direction are provided. This provides a space S between the skin-side sheet portion 13ap and the non-skin side sheet portion 13bp, making it easier for excrement absorbed from the skin side to remain in the space S. Consequently, this makes it possible to reduce the risk of excrement, once absorbed by the absorbent body 11, returning to the skin side and adhering to the wearer's skin.

[0085] At this time, the portion (apex) of the skin-side convex portion 13bx of the non-skin side sheet 13bp closest to the skin side is joined to the skin-side sheet 13ap, respectively, to form a first joining portion G1 and a second joining portion G2. On the other hand, in the non-skin side sheet 13bp, between the skin-side convex portions 13bx adjacent to each other in the transverse direction, a non-skin-side convex portion 13by protruding toward the non-skin side is provided, and the non-skin-side convex portion 13by becomes a groove portion that is recessed toward the non-skin side when viewed from the skin side. Therefore, as Figure 5 As shown in FIG. 1A , a space S is formed between the skin-side sheet 13ap and the non-skin-side sheet 13bp between the first and second joining portions G1, G2, which are spaced a predetermined distance apart in the transverse direction. This space S facilitates the retention of excrement received in the through-holes 12H in the space S provided in the transverse direction between the first and second joining portions G1, G2, thereby alleviating the reduction in absorbency caused by the joining between the skin-side sheet 13ap and the non-skin-side sheet 13bp. Furthermore, this space S facilitates the diffusion of absorbed excrement in the longitudinal direction.

[0086] Preferably, inside the through-hole 12H, the average height of the protrusions on the surface of the skin-side sheet 13ap facing the non-skin-side sheet 13bp is lower than the average height of the skin-side protrusions 13bx of the non-skin-side sheet 13bp. The height of a protrusion refers to the length from the center of each sheet in the thickness direction to the apex of the protrusion. For example, the height of the skin-side protrusion 13bx of the non-skin-side sheet 13bp is the length from the center ct of the height 13T in the thickness direction of the non-skin-side sheet 13bp to the apex of the skin-side protrusion 13bx in the thickness direction. The height of the non-skin-side protrusion 13by is the length from the center ct of the height 13T in the thickness direction of the non-skin-side sheet 13bp to the apex of the non-skin-side protrusion 13by in the thickness direction. On the other hand, because the surface of the skin-side sheet 13ap is substantially flat, the skin-side sheet does not have any portion protruding toward the skin side or the non-skin side, and the average height of the protrusions is zero. That is, in the diaper 1, the average height of the convex portions on the surface of the skin-side sheet portion 13ap facing the non-skin-side sheet portion 13bp is zero, so it is clear that the average height of the convex portions is lower than the average height of the skin-side convex portions 13bx of the non-skin-side sheet portion 13bp. Therefore, compared with a case where the skin-side sheet portion 13ap includes convex portions in the same manner as the skin-side convex portions 13bx of the non-skin-side sheet portion 13bp, the skin-side sheet portion 13ap and the skin-side convex portions 13bx can be brought into contact with each other more reliably, and the joining between the skin-side sheet portion 13ap and the non-skin-side sheet portion 13bp in the first joining portion G1 and the second joining portion G2 can be further strengthened.

[0087] In addition, if Figure 4 、 Figure 5 As shown in Figures 1 and 2, it is preferable that the non-skin side sheet 13bp has multiple protrusions 13bx and 13by not only on the surface facing the skin side sheet 13ap but also on both sides. As described above, the non-skin side sheet 13b of the diaper 1 passes between a pair of rollers in which the protrusions of one gear roller engage with the concave portions of the other gear roller, thereby forming protrusions 13bx and 13by on both sides. It should be noted that the height of the multiple skin-side protrusions 13bx formed in this manner in the diaper 1 is substantially the same as the height of the multiple non-skin-side protrusions 13by. By providing not only the skin-side protrusions 13bx facing the skin side sheet 13ap but also the non-skin-side protrusions 13by protruding toward the non-skin side, a space S can be provided not only between the skin side sheet 13ap and the non-skin side sheet 13bp, but also in the portion on the non-skin side relative to the non-skin side sheet 13bp. This makes it easier for excrement to remain in the space S and to diffuse longitudinally within the space S.

[0088] In addition, if Figure 3As shown, when the skin side sheet 13ap is substantially flat and the non-skin side sheet 13bp has convex portions 13bx and 13by protruding on both sides in the thickness direction, it is preferred to provide a joining portion G (first joining portion G1 and second joining portion G2) for joining the skin side sheet 13ap and the non-skin side sheet 13bp on the skin side relative to the center 12c in the thickness direction of the absorbent core 12. Therefore, the through hole 12H of the absorbent body 11 is recessed deeper from the non-skin side toward the skin side, so that when the diaper 1 is viewed from the non-skin side, the wearer or the like can more easily recognize the presence of the through hole 12H. In the diaper 1, the sheet passes between a pair of rollers in which the convex portion of one gear roller and the concave portion of another gear roller are engaged with each other, thereby forming convex portions 13bx and 13by on both surfaces of the non-skin side sheet 13b. The non-skin side sheet 13b formed in this way has a higher transverse stretchability than the skin side sheet 13a. Therefore, when the skin side piece 13a and the non-skin side piece 13b are respectively arranged on the skin side and the non-skin side of the absorbent core 12, the non-skin side piece 13b is arranged to extend to the skin side relative to the center 12c in the thickness direction of the absorbent core 12, and the joint G is positioned on the skin side relative to the center 12c in the thickness direction of the absorbent core 12.

[0089] More preferably, in addition to the first joining portion G1 and the second joining portion G2, a joining portion G (another joining portion) is provided inside the through hole 12H where the skin side sheet portion 13ap and the non-skin side sheet portion 13bp are joined, and the other joining portion G is spaced apart from both the first joining portion G1 and the second joining portion G2. In other words, it is preferable to provide three or more joining portions G spaced apart from each other inside the through hole 12H. Figure 5 As shown, in the diaper 1, four or more joining portions G, including a first joining portion G1 and a second joining portion G2, are provided for joining the skin-side sheet portion 13ap and the non-skin-side sheet portion 13bp. Therefore, the joining between the skin-side sheet portion 13ap and the non-skin-side sheet portion 13bp inside the through-hole 12H can be further strengthened, and multiple spaces S can be provided by spacing the joining portions adjacent to each other in the transverse direction by a predetermined distance. This makes it easier for excrement to spread in the longitudinal direction while enhancing the absorbency of the through-hole 12H.

[0090] like Figure 4 As shown, in the non-skin side sheet 13bp of the diaper 1, a plurality of skin side convex portions 13bx extending in the longitudinal direction are provided in the transverse direction. In the non-skin side sheet 13bp, two skin side convex portions 13bx adjacent to each other in the transverse direction are both in contact with the skin side sheet 13ap. In the joining between the non-skin side sheet 13bp and the skin side sheet 13ap inside the through hole 12H, it is preferable that Figure 2As shown, the shape of the through hole 12H extends in the longitudinal direction, and it is preferred that the two convex portions adjacent in the transverse direction are spaced apart from each other in the transverse direction and extend in the longitudinal direction. The skin-side apex of the skin-side convex portion 13bx contacts the skin-side sheet portion 13ap. The portion where the adhesive g provided on the skin-side sheet portion 13ap contacts and engages with the skin-side convex portion bx is the joining portion G. Because the shape of the through hole 12H extends in the longitudinal direction, and the two convex portions spaced apart in the transverse direction extend in the longitudinal direction, this makes it easy for the space S between the first joining portion G1 and the second joining portion G2 in the transverse direction to become an area extending in the longitudinal direction, making it easier for excrement to diffuse in the longitudinal direction inside the through hole 12H. As a result, in the absorbent body 11, the risk of excrement diffusing in the transverse direction of the absorbent body 11 and the risk of excrement leaking out of the absorbent body 11 (diaper 1) in the transverse direction can be reduced.

[0091] Furthermore, it is more preferable that the longitudinal distance between the two skin-side convex portions 13bx extending longitudinally and the skin-side sheet portion 13ap, inside the through-hole 12H, is greater than the transverse spacing distance (predetermined distance) DG between the first and second junctions. Therefore, compared to a case where the longitudinal distance between the two skin-side convex portions 13bx and the skin-side sheet portion 13ap is equal to or less than the spacing distance DG, the space S provided laterally between the first and second junctions G1 and G2 is more likely to maintain its longitudinally extending shape inside the through-hole 12H. This allows absorbed excrement to more easily disperse longitudinally.

[0092] Regarding the first joint portion G1 and the second joint portion G2, it is preferred that Figure 5 As shown in FIG. 1A , the lateral spacing distance DG between the first joint G1 and the second joint G2 is greater than the lateral length obtained by dividing the sum of the lateral length WG1 of the first joint G1 and the lateral length WG2 of the second joint G2 by 2 (DG>(WG1+WG2) / 2). In this case, the area of ​​the first joint G1 and the second joint G2 can be narrowed compared to the case where the spacing distance DG is shorter than the value obtained by dividing the sum of the lengths WG1 and WG2 by 2. This can reduce the rigidity of the inner side of the through hole 12H and reduce the risk of the joint G preventing the absorbent body 11 from deforming from the through hole 12H, making it easier for the absorbent body 11 to deform along the wearer's body.

[0093] In the diaper 1, the joining portion G (the first joining portion G1 and the second joining portion G2) is joined using an adhesive such as a hot melt adhesive. The adhesive forming the joining portion G is provided on the skin side sheet 13a or the non-skin side sheet 13b. Figure 6 As shown in A, the hot melt adhesive g is provided on the skin side sheet 13a. Figure 6 A is an explanatory diagram illustrating an application area of ​​the adhesive g of the diaper 1 . Figure 6A shows a state of a portion of the skin side sheet 13a when viewed from the non-skin side. It is preferable that the adhesive g is provided in a continuous manner in the transverse direction. Figure 6 The adhesive g shown in A is applied in a so-called spiral pattern, and the adhesive g is provided in a transversely continuous manner. Therefore, by making it easier to arrange the adhesive g in the portion where the skin side sheet 13ap and the non-skin side sheet 13bp contact each other, it is possible to form the first junction G1 and the second junction G2. As a result, the area (space S) between the first junction G1 and the second junction G2, which are spaced apart, can be more reliably formed. The absorbency of excrement is enhanced, and excrement is more easily diffused in the longitudinal direction.

[0094] It is sufficient to arrange the adhesive for forming the joint G on at least one of the skin side sheet 13a and the non-skin side sheet 13b. The adhesive can be arranged on any of these sheets. However, as in the present embodiment, when one is a flat sheet (skin side sheet 13a) and the other is a sheet with projections and depressions (non-skin side sheet 13b), it is preferred to apply the adhesive to the flat sheet. Therefore, the flat sheet can be more reliably joined to the convex portion of the sheet with projections and depressions. In the present embodiment, the joint G is arranged by using an adhesive such as a hot melt adhesive. However, the joint G does not have to be limited to the portion formed by the adhesive. For example, welding and compression can be adopted.

[0095] It should be noted that the application pattern of the adhesive g provided on the skin side sheet 13a or the non-skin side sheet 13b is not limited to Figure 6 A is the so-called spiral pattern. Figure 6 B and Figure 6 C is an explanatory diagram illustrating an application area of ​​the adhesive g of the diaper 1 in another embodiment. Figure 6 B is a so-called Ω-shaped pattern, and is an application pattern of the adhesive g provided in a state where a plurality of columns of the adhesive g extending in the transverse direction are continuous in the longitudinal direction. Figure 6 C is a coating pattern of adhesive g in which a plurality of adhesives g extending in the transverse direction are intermittently arranged in the longitudinal direction. Figure 6 A to Figure 6 As shown in FIG. 3 , by providing the adhesive g in a state of being continuously arranged in the transverse direction, the skin-side convex portion 13bx of the non-skin side sheet portion 13bp can be joined to the skin-side sheet portion 13ap, so that the joining between the first joining portion G1 and the second joining portion G2 inside the through-hole 12H can be further strengthened. In addition, as the application pattern of the adhesive g to the skin-side sheet 13a or the non-skin side sheet 13b, a pattern in which the adhesive g is applied to the entire area of ​​the skin-side sheet 13a or the non-skin side sheet 13b without any gaps (so-called gapless application) can be used.

[0096] Preferably, in the absorbent body 11, at least one side end of the skin side sheet 13a and the non-skin side sheet 13b in the longitudinal direction is positioned outside one side end of the absorbent core 12 in the longitudinal direction, and on one side in the longitudinal direction, the end of the skin side sheet 13a and the end of the non-skin side sheet 13b are continuously joined in the transverse direction. Figure 1 and Figure 7 As shown, in the longitudinal direction, the ventral end of the skin side sheet 13a and the ventral end of the non-skin side sheet 13b are both positioned outside the ventral end of the absorbent core 12, and the dorsal end of the skin side sheet 13a and the dorsal end of the non-skin side sheet 13b are both positioned outside the dorsal end of the absorbent core 12. That is, the longitudinal length of each of the skin side sheet 13a and the non-skin side sheet 13b is longer than the longitudinal length of the absorbent core 12, and the longitudinal length of each of the skin side sheet portion 13ap and the non-skin side sheet portion 13bp is longer than the longitudinal length of the absorbent core 12. At this time, on the ventral side in the longitudinal direction, the ventral end of the skin side sheet portion 13ap and the ventral end of the non-skin side sheet portion 13bp are joined in a joining portion 13E. Similarly, on the dorsal side in the longitudinal direction, the dorsal end of the skin side sheet portion 13ap and the dorsal end of the non-skin side sheet portion 13bp are joined in another joining portion 13E. In each joint 13E, the skin side sheet portion 13ap and the non-skin side sheet portion 13bp are joined to each other by applying heat and pressure. The joint 13E is joined in a continuous state in the transverse direction, and is joined in a continuous state from the transverse one side end of the core wrap sheet 13 to the transverse other side end in the ventral end and the dorsal end. By arranging the joint 13E, even when excreta diffuses longitudinally through the space S between the first joint G1 and the second joint G2 and reaches any longitudinal end of the absorbent core 12, the excreta is blocked by the joint 13E arranged on the longitudinal end outside of the absorbent core 12. This makes it possible to reduce the risk of excreta leaking out from the longitudinal outside of the absorbent body 11. It should be noted that in the diaper 1, the joint 13E is arranged in the longitudinal ventral end and the dorsal end of the absorbent body 11. However, the joint 13E can be arranged in any one of the ventral end and the dorsal end.

[0097] ===Other Implementation Methods===

[0098] Although the above embodiments of the present disclosure are simply for promoting understanding of the present disclosure, they are not to be construed as limiting the present disclosure in any way. The present disclosure can be changed or modified in various ways without departing from its gist and encompasses its equivalents.

[0099] In the above embodiment, the skin side sheet 13ap having flat skin and non-skin sides is joined to the non-skin side sheet 13ap having skin and non-skin sides including the convex portions 13bx and 13by, respectively, in the through hole 12H. However, the structure is not limited thereto. Figure 8 A to Figure 8 C is respectively according to other embodiments and Figure 3 The enlarged view of the part corresponding to the part X in FIG. Figure 8 As shown in A, the structure is as follows: the skin side sheet portion 13ap (second sheet portion) having two flat surfaces is joined to the skin side convex portion 13bx provided on the surface (skin side) of the non-skin side sheet portion 13bp (first sheet portion) facing the skin side sheet portion 13ap (second sheet portion). The non-skin side of the non-skin side sheet portion 13bp can be substantially flat. In addition, as Figure 8 As shown in B, the following structure can also be accepted: the skin side sheet portion 13ap (second sheet portion) having two flat surfaces is joined to the skin side convex portion 13bx provided on the surface (skin side) facing the skin side sheet portion 13ap (second sheet portion) of the non-skin side sheet portion 13bp (first sheet portion), and the non-skin side convex portion 13by is provided at a position overlapping with the skin side convex portion 13bx of the non-skin side sheet portion 13bp relative to the lateral direction. Similarly, Figure 8 A and Figure 8 In the structure shown in B, a space S is easily provided between the first joint G1 and the second joint G2 in the lateral direction. Therefore, excrement is easily absorbed even in the through hole 12H, and the absorbed excrement is easily spread in the longitudinal direction.

[0100] In the above embodiment, the skin side sheet 13ap is a flat sheet, and the non-skin side sheet 13bp includes the skin side convex portion 13bx. However, the structure is not limited to this. For example, Figure 8 As shown in FIG. 3 , the following structure is acceptable: in addition to the non-skin side sheet 13bp having a skin side convex portion 13bx on the surface facing the skin side sheet 13ap, the skin side sheet 13ap has a non-skin side convex portion (second sheet convex portion) 13ay on the surface facing the non-skin side sheet 13bp. In this case, by joining the non-skin side convex portion 13ay of the skin side sheet 13ap and the skin side convex portion 13bx of the non-skin side sheet 13bp in the junction G inside the through hole 12H, a space S can be provided between the first junction G1 and the second junction G2 in the transverse direction. This enhances the absorbency of excrement and makes it easier for excrement to diffuse longitudinally. In addition, both the skin side sheet 13ap and the non-skin side sheet 13bp have convex portions, so the thickness of the core wrap sheet 13 inside the through hole 12H can be increased. This makes it easier for excrement to stay, so that the risk of absorbed excrement returning to the skin side can be reduced. It should be noted that as the structure in which both the skin side sheet portion 13ap and the non-skin side sheet portion 13bp have convex portions is not necessarily required to be Figure 8The skin side sheet 13ap shown in C includes the skin side convex portion 13ax and the non-skin side convex portion 13ay, and the non-skin side sheet 13bp includes both the skin side convex portion 13bx and the non-skin side convex portion 13by. For example, the skin side of the skin side sheet 13ap and the non-skin side of the non-skin side sheet 13bp may be flat.

[0101] In the above embodiment, the core wrap sheet 13 is formed of two sheets including the skin side sheet 13a and the non-skin side sheet 13b, but the structure is not limited to this. For example, the core wrap sheet 13 may have a structure in which one sheet serves as the skin side sheet portion 13ap and the non-skin side sheet portion 13bp, or the core wrap sheet 13 may have a structure in which three or more sheets serve as the skin side sheet portion 13ap and the non-skin side sheet portion 13bp.

[0102] In the above embodiment, with respect to the first joint G1 and the second joint G2, the lateral spacing distance DG between the first joint G1 and the second joint G2 is longer than the lateral length obtained by dividing the sum of the lateral length WG1 of the first joint G1 and the lateral length WG2 of the second joint G2 by 2 (DG>(WG1+WG2) / 2). However, the construction is not limited to this. The lateral spacing distance DG between the first joint G1 and the second joint G2 can be shorter than the lateral length obtained by dividing the sum of the lateral length WG1 of the first joint G1 and the lateral length WG2 of the second joint G2 by 2 (DG<(WG1+WG2) / 2). Therefore, compared with the case where the spacing distance DG is longer than the value obtained by dividing the sum of the lengths WG1 and WG2 by 2, the area of ​​the joint G can be made longer. This can further strengthen the connection between the skin side sheet 13ap and the non-skin side sheet 13bp on the inner side of the through hole 12H.

[0103] In addition, in the above embodiment, the joining portion G (the first joining portion G1 and the second joining portion G2) is arranged on the skin side relative to the center 12c of the absorbent core 12 in the thickness direction. However, the structure is not limited to this. The joining portion G can be arranged on the non-skin side relative to the center in the thickness direction, or arranged in the center 12c of the absorbent core 12 in the thickness direction. For example, in the process of forming the joining portion G, the following method can be accepted: in a state where the skin side sheet 13ap and the non-skin side sheet 13bp are arranged on both surfaces of the absorbent core 12, the absorbent core 12 is compressed (pressurized using pins, etc.) from the skin side or non-skin side of the through hole 12H, in this state, in a plan view, the skin side sheet 13ap and the non-skin side sheet 13bp are joined to each other inside the through hole 12H. In this case, when compression is applied from the skin side of the through hole 12H, the joining portion G is arranged on the non-skin side relative to the center 12c of the thickness direction of the absorbent core 12. When compression is applied from both the skin side and the non-skin side of the through-hole 12H, the joining portion G is provided at the center portion in the thickness direction of the absorptive core 12 .

[0104] In the above embodiment, the non-skin side sheet 13b has the skin side convex portion 13bx and the non-skin side convex portion 13by over the entire area, but the structure is not limited thereto. The skin side convex portion 13bx may be provided only in the portion of the non-skin side sheet 13bp located at least inside the through hole 12H.

[0105] Reference Signs List

[0106] 1: Diapers (disposable shorts, absorbent articles),

[0107] 10: Absorbent body,

[0108] 11: absorber,

[0109] 12: absorbent core,

[0110] 12H: through hole,

[0111] 13: core wrapping sheet,

[0112] 13a: skin side piece,

[0113] 13ap: skin side part (first part),

[0114] 13b: non-skin side panels,

[0115] 13bp: non-skin side part (second part),

[0116] 13bx: skin side convex part (first convex part),

[0117] 13by: non-skin lateral convex part,

[0118] 13E: Joint,

[0119] 14: Frontal film,

[0120] 15: back sheet,

[0121] 17: elastic member,

[0122] 18: elastic member,

[0123] 30: ventral member,

[0124] 31: Skin side piece,

[0125] 32: Non-skin side panels,

[0126] 35: elastic rope,

[0127] 40: back member,

[0128] 41: Skin side piece,

[0129] 42: Non-skin side panels,

[0130] 45: elastic rope,

[0131] g: adhesive,

[0132] G: joint,

[0133] S: space,

[0134] LH: Leg opening,

[0135] BH: Open waist

Claims

1. An absorbent article having longitudinal, transverse and thickness directions that are orthogonal to each other, The absorbent article comprises: An absorbent body comprising: absorbent core; a first sheet portion covering the absorbent core from one side in the thickness direction; and a second sheet portion covering the absorbent core from the other side in the thickness direction, The absorbent core includes a through hole extending through the thickness direction. In a plan view, the absorbent article has a first joining portion and a second joining portion inside the through hole. Each of the first joining portion and the second joining portion is a portion where the first sheet portion and the second sheet portion are joined, In the plan view, the second engaging portion is spaced apart from the first engaging portion by a predetermined distance in the transverse direction, The first sheet portion has a plurality of protrusions protruding in the thickness direction at least on a surface of the first sheet portion facing the second sheet portion inside the through hole, and The convex portion and the second sheet portion are joined by each of the first joining portion and the second joining portion, The first sheet portion has a plurality of protrusions on both side surfaces in the thickness direction.

2. The absorbent article according to claim 1, wherein The fiber density of the central portion of the convex portion in the transverse direction is higher than the fiber density of the side end portions of the convex portion in the transverse direction.

3. The absorbent article according to claim 1 or 2, wherein Inside the through hole, Average height of the protrusions on the surface of the second sheet facing the first sheet Lower than The average height of the protrusions on the surface of the first sheet portion facing the second sheet portion.

4. The absorbent article according to claim 1, wherein The first sheet portion has a plurality of first sheet protrusions protruding in the thickness direction on a surface of the first sheet portion facing the second sheet portion inside the through hole in the plan view. The second sheet portion has a plurality of second sheet protrusions protruding in the thickness direction at least on a surface of the second sheet portion facing the first sheet portion inside the through hole in the plan view, and The first sheet protrusion and the second sheet portion are joined by each of the first joining portion and the second joining portion, or the second sheet protrusion and the first sheet portion are joined by each of the first joining portion and the second joining portion.

5. The absorbent article according to claim 1, wherein Inside the through-hole, the absorbent article has: a first joint; a second joint portion; and another joining portion in which at least one or more portions of the first sheet portion and the second sheet portion are joined, and The other engaging portion is spaced apart from the first engaging portion and the second engaging portion in the lateral direction.

6. The absorbent article according to claim 1, wherein The through hole extends along the longitudinal direction, Inside the through hole, the first sheet portion has a plurality of protrusions on at least a surface of the first sheet portion facing the second sheet portion. The plurality of protrusions are in contact with the second sheet portion and protrude in the thickness direction, and Two convex portions adjacent to each other in the transverse direction are spaced apart in the transverse direction and extend along the longitudinal direction.

7. The absorbent article according to claim 6, wherein Inside the through hole, a distance in the longitudinal direction between the two protrusions and the second piece portion at a contact point is longer than the predetermined distance.

8. The absorbent article according to claim 1, wherein One side in the thickness direction is the non-skin side, The other side in the thickness direction is the skin side, and The first sheet portion is a non-skin side sheet portion located on the non-skin side with respect to the absorbent core.

9. The absorbent article according to claim 8, wherein The first joining portion and the second joining portion are provided on the skin side relative to the center of the absorbent core in the thickness direction.

10. The absorbent article according to claim 1, wherein An adhesive is provided in at least one of the first sheet portion and the second sheet portion, and The adhesive is disposed in a continuous manner in the transverse direction.

11. The absorbent article according to claim 1, wherein In the horizontal direction, A spacing distance between the first engaging portion and the second engaging portion is shorter than a length obtained by dividing a sum of a length of the first engaging portion and a length of the second engaging portion by 2.

12. The absorbent article according to claim 1, wherein In the horizontal direction, A spacing distance between the first engaging portion and the second engaging portion is longer than a length obtained by dividing a sum of a length of the first engaging portion and a length of the second engaging portion by 2.

13. The absorbent article according to claim 1, wherein At least one longitudinal side end of the first sheet portion and the second sheet portion is positioned outside one longitudinal side end of the absorbent core, and On one side in the longitudinal direction, An end portion of the first sheet portion and an end portion of the second sheet portion are continuously joined in the transverse direction.

14. The absorbent article according to claim 1, wherein The absorbent body includes a pair of through holes at a central portion when the absorbent body is divided into three parts in the longitudinal direction, and The pair of through holes are provided on one side and the other side of the absorbent body in the lateral direction.

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