Absorbent article

Abstract

An absorbent article, in an unfolded state and an elongated state, has a backside elastic member (27) that is stretched and contracted at least in a left-right direction at a position closer to a back side than a center in a longitudinal direction, the backside elastic member (27) being located most on a belly side in the longitudinal direction, has an under-crotch elastic member (40) that is stretched and contracted at least in the longitudinal direction at a position closer to a non-skin side than an absorbent core (11), an under-crotch elastic region (ER) being divided by a stretched and contracted portion of the under-crotch elastic member (40) in a thickness direction, the under-crotch elastic region (ER) being provided at a position overlapping the absorbent core (11), the under-crotch elastic region (ER) being provided at a position closer to the belly side than the backside elastic member (27), and a length (L2) in the longitudinal direction from a back side end of the under-crotch elastic region (ER) to a belly side end of the backside elastic member (27) being longer than a length (L1) in the longitudinal direction of the under-crotch elastic region (ER).

Description

[0001] Technology Area

[0002] This invention relates to absorbent articles. Background Technology

[0003] The disposable diaper disclosed in Patent Document 1 has a first elastic member and a second elastic member in the buttocks extending along the long side, located on the non-contact side of the skin, compared to the absorbent core. The contraction of the first and second elastic members generates upward tension, reducing the gap between the diaper and the wearer's crotch and buttocks. This improves the ability to prevent leakage of excrement and enhances the sense of security during wear due to a proper fit.

[0004] Existing technical documents

[0005] Patent documents

[0006] Patent document 1: Japanese Patent Application Publication No. 2010-131196.

[0007] The technical problem that the invention aims to solve

[0008] However, as with the disposable diaper disclosed in Patent Document 1, if the contraction of the first elastic member and the second elastic member of the buttocks reduces the gap between the wearer's crotch and buttocks and the diaper, there is a concern that excrement may leak from the outside of the diaper in the width direction if a large amount of excrement is excreted at once and the part that comes into contact with the excretion opening cannot completely absorb the excrement, or if the wearer's body size is too large or too small and the contraction state of the first elastic member and the second elastic member of the buttocks does not properly fit the wearer's body. Summary of the Invention

[0009] The present invention was made in view of the aforementioned problems, and its object is to provide an absorbent article that, when worn, easily absorbs excrement and easily reduces concerns about excrement leakage.

[0010] Technical means for solving technical problems

[0011] The main invention for achieving the above-mentioned objectives is an absorbent article having a ventral waist portion, a back waist portion, and an absorbent core. In its unfolded and extended state, it has mutually orthogonal long-side, left-right, and thickness directions. A back-side elastic member, extending and contracting at least along the left-right direction, is located further back than the center of the long-side direction. The back-side elastic member is located at the ventral side of the long-side direction. The absorbent article also has a crotch elastic member positioned further away from the skin than the absorbent core and extending and contracting at least along the long-side direction. Viewed in the thickness direction, a crotch elastic region is defined by the extending portion of the crotch elastic member. This crotch elastic region is located overlapping the absorbent core and is positioned further back than the back-side elastic member. The length of the long-side direction from the back end of the crotch elastic region to the ventral end of the back-side elastic member is longer than the length of the long-side direction of the crotch elastic region.

[0012] Other features of the invention will become apparent from the description in this specification and the accompanying drawings.

[0013] Invention Effects

[0014] According to the present invention, an absorbent article can be provided that, when worn, easily absorbs excrement and easily alleviates concerns about excrement leakage. Attached Figure Description

[0015] Figure 1 This is a schematic front view showing the underwear-type disposable diaper 1.

[0016] Figure 2 This is a schematic top view showing the diaper 1 in its unfolded and stretched state as viewed from the skin side.

[0017] Figure 3 It is shown Figure 2 A rough cross-sectional view at the CC line.

[0018] Figure 4 This is a schematic cross-sectional view showing the absorbent body 10.

[0019] Figure 5 This is a diagram illustrating the configuration of the elastic member 40 in the crotch area.

[0020] Figure 6 This is a diagram illustrating the configuration of a modified example of the crotch elastic member 40.

[0021] Figure 7 It is shown Figure 2 An enlarged illustration of the central part of diaper 1 in the left-right direction.

[0022] Figure 8 This is a diagram illustrating the deformation of the absorbent core 11.

[0023] Figure 9 This is a diagram illustrating the bonding area FR where the absorbent body 10 is fixed to the outer component 20. Detailed Implementation

[0024] The following points are made clear from the description in this specification and the accompanying drawings.

[0025] (Method 1)

[0026] An absorbent article has a ventral waist portion, a back waist portion, and an absorbent core. In an unfolded and extended state, it has mutually orthogonal long side, left-right, and thickness directions. A back elastic member, extending and contracting at least along the left-right direction, is located further back than the center of the long side direction. The back elastic member is located at the ventral side of the long side direction. The absorbent article also has a crotch elastic member positioned further away from the skin than the absorbent core and extending and contracting at least along the long side direction. Viewed in the thickness direction, a crotch elastic region is defined by the extending portion of the crotch elastic member. The crotch elastic region is located overlapping the absorbent core and is positioned further back than the back elastic member. The length of the long side direction from the back end of the crotch elastic region to the ventral end of the back elastic member is longer than the length of the long side direction of the crotch elastic region.

[0027] According to the absorbent article of method 1, when worn, the absorbent core deforms due to the contraction of the elastic member in the crotch area, making it easy for the absorbent article to come into contact with the wearer's excretory opening. Furthermore, the length of the long side from the back end of the elastic area in the crotch area to the ventral end of the elastic member is longer than the length of the long side of the elastic area in the crotch area. Compared to the case where the length of the long side from the back end of the elastic area in the crotch area to the ventral end of the elastic member is less than the length of the long side of the elastic area in the crotch area, the contraction of the elastic member, which is located further back than the elastic area in the crotch area, makes it easier for the portion further back than the elastic area in the crotch area to deform, causing the central portion in the left-right direction to concave towards the non-skin side. Therefore, even when a large amount of excrement is excreted, it becomes easier to accumulate excrement in the concave portion. Thus, when wearing the absorbent article, excrement is easily absorbed at the excretory opening, and concerns about leakage are reduced.

[0028] (Method 2)

[0029] The absorbent article according to method 1 has a deformation-inhibiting portion located further back than the groin elastic region and further ventrally than the dorsal elastic member. The deformation-inhibiting portion is used to inhibit the deformation of the absorbent core caused by the contraction of the groin elastic member. The deformation-inhibiting portion has a portion along the left-right direction.

[0030] According to the absorbent article of method 2, when worn, the absorbent core deforms due to the contraction of the elastic member in the crotch, which is located on the ventral side of the deformation-inhibiting part, making it easy for the absorbent article to come into contact with the wearer's excretory opening. Furthermore, the deformation-inhibiting part, located on the back side of the elastic area in the crotch and on the ventral side of the elastic member in the back side, suppresses the deformation of the absorbent core caused by the contraction of the elastic member in the crotch. The elastic member on the back side, located on the back side of the deformation-inhibiting part, contracts in the left and right directions, making it easier to deform on the back side of the deformation-inhibiting part, causing the central part in the left and right directions to be recessed towards the non-skin side, thereby making it easier to provide a space for accumulating excrement.

[0031] (Method 3)

[0032] According to the absorbent article of method 1 or 2, a folding portion for folding the absorbent article is provided at the center of the long side, and the dorsal end of the groin elastic region is located further to the abdomen than the dorsal end of the folding portion.

[0033] According to the absorbent article of method 3, when worn, the absorbent article is easily brought into contact with the wearer's excretory opening by the deformation of the absorbent core caused by the contraction of the elastic part in the crotch area which is located on the ventral side of the folded part. Furthermore, it becomes more easily deformable on the back side of the elastic part in the crotch area, causing the central part in the left-right direction to be recessed towards the non-skin side, thereby making it easier to set up a space for accumulating excrement.

[0034] (Method 4)

[0035] In the absorbent article according to any one of methods 1 to 3, the deformation-inhibiting portion is the folded portion.

[0036] According to the absorbent article of method 4, when worn, the absorbent article easily comes into contact with the wearer's excretory opening due to the deformation of the absorbent core caused by the contraction of the elastic component in the crotch. Since the deformation inhibition part is a folded part, it is not necessary to set up a separate deformation inhibition part to inhibit the deformation of the absorbent core caused by the contraction of the elastic component in the crotch. It becomes easier to deform on the back side than the deformation inhibition part, so that the central part in the left and right directions is recessed towards the non-skin side, thereby making it easier to set up a space for accumulating excrement.

[0037] (Method 5)

[0038] According to the absorbent article of method 2 or 3, the deformation-inhibiting part is a pressing part formed by pressing the absorbent core in the thickness direction at least.

[0039] According to the absorbent article of method 5, when worn, the absorbent article easily comes into contact with the wearer's excretory opening due to the deformation of the absorbent core caused by the contraction of the elastic component in the crotch. Furthermore, by having a deformation suppression part that changes the rigidity of the absorbent core by utilizing the squeezing part provided in the absorbent core, the deformation of the absorbent core caused by the contraction of the elastic component in the crotch is suppressed. The central part in the left-right direction becomes more easily deformable than the deformation suppression part, causing it to be recessed towards the non-skin side, thereby making it easier to provide a space for accumulating excrement.

[0040] (Method 6)

[0041] According to the absorbent article of method 2 or 3, the deformation-inhibiting part is a low-weight part in which the basis weight of the absorbent core is lower than that of the surrounding part.

[0042] According to the absorbent article of method 6, when worn, the absorbent article easily comes into contact with the wearer's excretory opening due to the deformation of the absorbent core caused by the contraction of the elastic component in the crotch. Furthermore, by having a deformation suppression part that changes the rigidity of the absorbent core by utilizing a low-weight portion provided in the absorbent core, the deformation of the absorbent core caused by the contraction of the elastic component in the crotch is suppressed. The central portion in the left-right direction becomes concave towards the non-skin side, which is more easily deformed than the deformation suppression part, thereby making it easier to provide a space for accumulating excrement.

[0043] (Method 7)

[0044] According to any one of methods 2 to 7, in the left-right direction, the deformation-inhibiting portion has a portion that overlaps with the elastic region under the crotch.

[0045] According to the absorbent article of method 7, when worn, the absorbent article easily comes into contact with the wearer's excretory opening due to the deformation of the absorbent core caused by the contraction of the elastic component in the crotch, and the deformation inhibition part inhibits the deformation of the absorbent core caused by the contraction of the elastic component in the crotch. The central part in the left and right directions becomes more easily deformed than the deformation inhibition part, so that the central part in the left and right directions is recessed towards the non-skin side, thereby making it easier to set up a space for accumulating excrement.

[0046] (Method 8)

[0047] According to any one of methods 2 to 7, the length of the deformation-inhibiting portion in the left-right direction is longer than the length in the left-right direction of the elastic region in the crotch.

[0048] According to the absorbent article of method 8, when worn, the absorbent article easily comes into contact with the wearer's excretory opening due to the deformation of the absorbent core caused by the contraction of the elastic component in the crotch. Furthermore, since the length of the deformation-inhibiting part in the left-right direction is longer than the length of the elastic region in the left-right direction, compared to the case where the length of the elastic region in the left-right direction is set to be longer than the length of the deformation-inhibiting part in the left-right direction, the deformation of the absorbent core caused by the contraction of the elastic component in the crotch becomes easier to inhibit by the deformation-inhibiting part. It becomes easier to deform on the back side than the deformation-inhibiting part, causing the central part in the left-right direction to be recessed towards the non-skin side, thereby making it easier to set up a space for accumulating excrement.

[0049] (Method 9)

[0050] According to any one of embodiments 2 to 8, in the form of underwear, the respective ends of the abdominal waistband and the back waistband are joined at a joint. The absorbent article has a long-side elastic member that stretches along the long side direction. The long-side elastic member is located further outward in the left-right direction than the crotch elastic area and is located at least further back than the crotch elastic member. The absorbent article has a plurality of elastic members including the back elastic member at a location further back than the center in the long side direction. When viewed in the thickness direction, the absorbent article has an overlapping portion of the absorbent core, the elastic member, and the long-side elastic member. The elastic member is one of the plurality of elastic members located at a position overlapping the joint in the long side direction.

[0051] According to the absorbent article of method 9, when worn, the absorbent core deforms due to the contraction of the long side elastic member, making it easy for the absorbent article to conform to the wearer's body or to reduce the leakage of excrement. Furthermore, by the expansion and contraction of the elastic member supported at the joint in the left and right directions, it becomes easy to expand the absorbent core outward in the left and right directions, thus making it easy to keep the absorbent core flat. It also makes it easy for the portion further back than the elastic area under the crotch to deform, causing the central portion in the left and right directions to be recessed towards the non-skin side. Therefore, even when a large amount of excrement is excreted, it becomes easy to accumulate excrement in the recessed space.

[0052] (Method 10)

[0053] The absorbent article according to any one of methods 1 to 9 has the following features: a narrowest portion, which is narrowest in width in the left-right direction on the inner side of the long side; and a widest portion, which is disposed in the long side direction at a position further back than the narrowest portion, and the width of the widest portion in the left-right direction is widest in the long side direction at a position further back than the center, wherein the widest portion is disposed in the long side direction at a position further back than the crotch elastic area.

[0054] According to the absorbent article of method 10, in the long side direction, by having the widest part of the absorbent core that is more back than the elastic area under the crotch, the central part of the part that is more back than the elastic area under the crotch is easily deformed and recessed towards the non-skin side in the left and right directions. Even when a large amount of excrement is excreted, it becomes easy to accumulate excrement in the recessed space, which can alleviate concerns about excrement leakage.

[0055] (Method 11)

[0056] According to the absorbent article of method 10, a deformation-inhibiting portion is provided at a location further back than the crotch elastic region and further ventrally than the back elastic member. The deformation-inhibiting portion is used to inhibit the deformation of the absorbent core caused by the contraction of the crotch elastic member. The deformation-inhibiting portion has a portion along the left-right direction. The absorbent core has an inclined portion in the long side direction, between the narrowest and widest portions, where the side end of the absorbent core slopes from the ventrally towards the back and from the inner side to the outer side in the left-right direction. At least a portion of the deformation-inhibiting portion overlaps with the inclined portion in the long side direction.

[0057] According to the absorbent article of method 11, the length of the absorbent core in the left and right directions is extended to the back side by the inclined portion of the absorbent core, thereby alleviating the concern that the absorbent core will be bent by the force from the outside in the left and right directions. It becomes easier to deform the part that is further back than the deformation inhibition portion so that the central part in the left and right directions is recessed to the non-skin side. Even when a large amount of excrement is excreted, it becomes easier to accumulate excrement in the recessed space.

[0058] (Method 12)

[0059] The absorbent article according to method 10 or 11 has a deformation-inhibiting portion located further back than the crotch elastic region and further ventrally than the dorsal elastic member. The deformation-inhibiting portion is used to inhibit the deformation of the absorbent core caused by the contraction of the crotch elastic member. The deformation-inhibiting portion has a portion along the left-right direction, and at least a portion of the deformation-inhibiting portion overlaps with the narrowest portion in the long side direction.

[0060] According to the absorbent article of method 12, the narrowest part of the absorbent core and the deformation-inhibiting part make it easier to suppress the deformation of the absorbent core caused by the crotch elastic member. Therefore, the absorbent core can easily come into contact with the wearer at a position closer to the abdomen than the deformation-inhibiting part, and at a position closer to the back than the deformation-inhibiting part, it can easily deform so that the central part in the left and right directions is concave towards the non-skin side. Even when a large amount of excrement is excreted, it is easy to accumulate excrement in the concave space.

[0061] (Method 13)

[0062] According to any one of methods 1 to 12, the absorbent core has a narrowest portion with the narrowest width in the left-right direction on its inner side in the long-side direction.

[0063] In the long side direction, the elastic region in the crotch has a portion that overlaps with the narrowest part.

[0064] According to the absorbent article of method 13, the deformation of the absorbent core caused by the contraction of the elastic component in the crotch makes it easy for the narrowest part of the absorbent core to come into contact with the wearer's excretory opening, thereby making it easier to improve the absorbency and fit of excrement during wear, and to reduce the discomfort caused by the rigidity of the absorbent core.

[0065] (Method 14)

[0066] According to any one of methods 1 to 13, the absorbent article, viewed from the skin side, has the following shape: a narrowest portion, which is narrowest in the left-right direction on the inner side of the long side; and a widest portion, which is located on the back side of the long side, and the width of the widest portion in the left-right direction is widest on the back side of the long side, which is wider than the center; the absorbent core has an inclined portion on the long side, between the narrowest portion and the widest portion, where the side end of the absorbent core slopes from the abdominal side toward the back side and from the inner side of the left-right direction toward the outer side; at least a portion of the inclined portion is located on the back side of the long side, which is closer to the groin elastic area.

[0067] According to the absorbent article of method 14, the length of the absorbent core in the left and right directions is extended by the inclined portion of the absorbent core, thereby alleviating the concern that the absorbent core will be bent in the left and right directions. It becomes easier to deform the part that is more back than the elastic area under the crotch so that the central part in the left and right directions is concave to the non-skin side. Even when a large amount of excrement is excreted, it becomes easier to accumulate excrement in the concave space.

[0068] (Method 15)

[0069] An absorbent article according to any one of methods 1 to 14 has an absorbent body having the absorbent core and an outer body having the abdominal waist portion and the back waist portion. The absorbent body is fixed to the outer body in an adhesive area. The area of ​​the adhesive area per unit area in the region of the absorbent body that overlaps with the portion from the back end of the crotch elastic region to the abdominal end of the back elastic member in the long side direction is larger than the area of ​​the adhesive area per unit area in the region of the absorbent body that overlaps with the crotch elastic region in the long side direction.

[0070] According to the absorbent article of method 15, compared to the case where the area of ​​the adhesive area per unit area in the region of the absorbent body that overlaps with the groin elastic region in the long side direction is set to be larger than the area of ​​the adhesive area per unit area in the region that partially overlaps with the part from the dorsal end of the groin elastic region to the ventral end of the dorsal elastic member in the long side direction, it becomes easier to reduce deformation such as shrinkage and bending in the part that partially overlaps with the part from the dorsal end of the groin elastic region to the ventral end of the dorsal elastic member. By making it easier to keep the absorbent core flat, it becomes easier to accumulate excrement in the recessed space when the part that is more dorsal than the groin elastic region is deformed so that the central part in the left and right directions is recessed to the non-skin side.

[0071] (Method 16)

[0072] According to any one of embodiments 1 to 15, in the form of underwear, the respective ends of the abdominal waistband and the back waistband are joined at a joint, and the absorbent core has a plurality of elastic members including the back elastic member at a location further back than the center in the long side direction, wherein, in the long side direction, all elastic members located further abdominal than the joint are discontinuous at the center in the left-right direction.

[0073] According to the absorbent article of method 16, it becomes easier to keep the absorbent core flat, and it becomes easier to deform the portion further back than the elastic area under the crotch, causing the central portion in the left-right direction to be recessed towards the non-skin side. Therefore, even when a large amount of excrement is excreted, it becomes easier to accumulate excrement in the recessed space.

[0074] (Method 17)

[0075] According to the absorbent article of method 16, among the plurality of elastic members, in the long side direction, the elastic member located at the position overlapping the joint and located on the most ventral side is discontinuous at the central portion in the left-right direction.

[0076] According to the absorbent article of method 17, it becomes easier to keep the absorbent core flat and to deform the part further back than the elastic area under the crotch so that the central part in the left and right direction is concave to the non-skin side. Therefore, even when a large amount of excrement is excreted, it becomes easier to accumulate excrement in the concave space.

[0077] (Method 18)

[0078] According to any one of embodiments 1 to 17, in the underwear-type state, the respective end portions of the abdominal waistband and the back waistband are joined at a joint, and the absorbent core has a plurality of elastic members including the back elastic member at a position further back than the center in the long side direction, wherein the maximum value of the interval between the elastic members that are adjacent to each other in the long side direction and are disposed at a position overlapping the joint in the long side direction is smaller than the maximum value of the interval between the elastic members that are adjacent to each other in the long side direction and are disposed at a position further abdominal than the joint in the long side direction.

[0079] According to the absorbent article of method 18, when worn, the elastic member located at the position overlapping the joint in the long side direction becomes easier to fit the wearer's waist by contraction, and becomes softer in the long side direction than the part overlapping the joint in the long side direction, making it easier to abut against the wearer's body, thus improving the comfort when wearing.

[0080] (Method 19)

[0081] According to any one of methods 1 to 18, when viewed in the thickness direction, the average weight of the absorbent core in the region that partially overlaps with the area from the dorsal end of the crotch elastic region to the ventral end of the dorsal elastic member is greater than the average weight of the absorbent core in the region that overlaps with the crotch elastic region.

[0082] According to the absorbent article of method 19, when viewed in the thickness direction, compared to the case where the average weight of the absorbent core in the area overlapping the part from the back end of the crotch elastic region to the ventral end of the back waist elastic member is set to be lower than the average weight of the absorbent core in the area overlapping the crotch elastic region, even if excrement accumulates in the portion recessed to the non-skin side of the portion located further back than the crotch elastic region, the absorbent core becomes more likely to absorb excrement, thus alleviating concerns about excrement leaking from the absorbent article during wear.

[0083] [Implementation Method]

[0084] Hereinafter, as an example of an absorbent article according to an embodiment of the present invention, an adult underwear-type disposable diaper (hereinafter also referred to as "diaper 1") will be described. However, the absorbent article according to the present invention is not limited to the above, and can also be used as a belt-type disposable diaper, sanitary underwear, etc. In addition, the wearer can also be an infant, animal, or other biological organism.

[0085] [This implementation method]

[0086] <Basic Structure of Underwear-Type Disposable Diaper 1>

[0087] Figure 1 This is a schematic front view of the underwear-type disposable diaper 1. Figure 2 This is a rough top view of diaper 1 in its unfolded and stretched state, viewed from the skin side. Figure 3 yes Figure 2 A rough cross-sectional view at the CC line. Figure 4 This is a schematic cross-sectional view of the absorbent body 10.

[0088] The “unfolded state” of diaper 1 refers to the state in which the waist joint (joint) 2 described later is untied, and the fold F (described later) of diaper 1 is opened in the long side direction and unfolded flat.

[0089] The "stretched state" of diaper 1 refers to the state in which diaper 1 is stretched without wrinkles by stretching the various elastic components of diaper 1 (e.g., waist elastic components 24 and 25, leak-proof elastic components 51, etc., described later). Specifically, it refers to the state in which the size of each material constituting diaper 1 (e.g., top sheet 12, inner sheet 23, etc., described later) is stretched to the same size as or close to the size of the individual component.

[0090] exist Figure 1 In the panty-style configuration shown, the diaper 1 has intersecting vertical, horizontal, and front-back directions, and forms a waist opening BH and a pair of leg openings LH. Additionally, Figure 2 In the unfolded state shown, there are intersecting long side directions, left-right directions, and thickness directions. The long side direction is the vertical direction along the underwear-shaped state. The thickness direction is the direction in which the components constituting diaper 1 are stacked (see reference). Figure 4 In the vertical direction, the waist opening (BH side) is designated as the upper side, and the crotch side as the lower side. In the front-back direction, the side that will become the wearer's abdomen is designated as the front side, and the side that will become the wearer's back is designated as the back side. In the thickness direction, the side that contacts the wearer's body (skin) is designated as the skin side, and the opposite side is designated as the non-skin side. Figure 2 In the diagram, CC represents the center in the left-right direction, and CL represents the center in the long-side direction.

[0091] In addition, such as Figure 3 As shown, the diaper 1 has an absorbent body 10 and an outer component (outer body) 20 disposed on the non-skin side relative to the absorbent body 10. The absorbent body 10 and the outer component 20 are bonded together in an area coated with an adhesive such as a hot melt adhesive (see reference). Figure 9 The absorbent body 10 is joined (fixed). Covering sheets 31 and 32 may also be provided at both ends of the absorbent body 10 in the long side direction from the skin side. This can prevent the edges of the absorbent body 10 from sinking into the wearer and prevent the opening of the absorbent body 10 from being blocked.

[0092] In this instruction manual, such as Figure 2 As shown, in the unfolded and stretched state of diaper 1, the ventral region when diaper 1 is divided into three equal parts along its long side is called "ventral side 1A", the central region is called "crotch area 1B", and the dorsal region is called "dorsal side 1C". In the unfolded state, at the fold F at the central position CL along the long side, diaper 1 is folded in half with the skin side as the inside. By joining the outer parts 20 of the ventral side (ventral waist area) 1A and the outer parts 20 of the dorsal side (dorsal waist area) 1C on both sides in the left and right directions, it becomes... Figure 1 The diaper 1 is shown in an underwear-like state. Examples of joining methods for the waistband joint 2 include welding, joining with adhesive, etc.

[0093] Fold F is the part of diaper 1 that is folded along the left-right direction, and it is a part with a specified width. The width of fold F ( Figure 7 The length Lf is the length along the long side of the diaper 1 in its unfolded and stretched state, extending from the center CL of the long side towards the ventral and dorsal sides, respectively, away from the thickness of the absorbent core 11 (described later). In other words, the center of the fold F in the long side direction is the center position CL of the long side direction of the diaper 1, and the length of the fold F in the long side direction is twice the thickness of the absorbent core 11.

[0094] like Figure 4 As shown, the absorbent body 10 includes an absorbent core 11 for absorbing excretory fluid, a liquid-permeable top sheet 12 (e.g., non-woven fabric) disposed on the skin side in the thickness direction of the absorbent core 11, a liquid-impermeable back sheet 13 (e.g., a resin film such as polyethylene or polypropylene) disposed on the non-skin side in the thickness direction of the absorbent core 11, a pair of side sheets 16, and an elastic component cover sheet 17. The elastic component cover sheet 17 is a sheet-like component that covers the crotch elastic component 40 (described in detail later) which stretches in the long side direction from the non-skin side.

[0095] The absorbent core 11 is a component that absorbs and retains excretory fluids such as urine. The surface of the absorbent core 11 may also be covered by a liquid-permeable core wrapping sheet 18 (e.g., thin paper). As the absorbent core 11, a component in which liquid absorbent fibers such as pulp containing superabsorbent polymer (SAP) are formed into a predetermined shape can be exemplified. The absorbent core 11 of this embodiment has a shape that tapers inward from the central portion in the long side direction to the left and right directions, but the planar shape of the absorbent core 11 is not particularly limited.

[0096] A pair of leak-proof wall portions 50 are provided on both sides of the absorbent body 10 in the left-right direction, along the long side direction. For example... Figure 4 As shown, the side pieces 16 extending from the non-skin-side sides of the back piece 13 are bent at multiple points and disposed on the skin-side sides of the top piece 12, thereby forming a leak-proof wall portion 50. A leak-proof wall elastic member 51 (e.g., a linear elastic member) is attached to the leak-proof wall portion 50 in a state of elongation along its long side. The leak-proof wall portion 50 has a raised portion 50a that can stand upright on the skin side and a fixed portion 50b that cannot stand upright. The fixed portion 50b is the part of the side piece 16 that is fixed by an adhesive such as a hot melt adhesive, thus preventing it from standing upright. Due to the elasticity of the leak-proof wall elastic member 51, the raised portion 50a of the leak-proof wall portion 50 stands upright on the wearer's skin side, blocking excrement. At both ends of the absorbent body 10, on the outer side further to the left and right than the leak-proof wall portion 50, leg elastic members 52 that extend and retract along their long side are respectively provided. Due to the elasticity of the leg opening elastic component 52, the diaper 1 can fit snugly around the wearer's legs. Leak-proof wall sections 50 and 50 are not necessarily required.

[0097] The outer component 20 is a sheet-like component that tapers inward from the center along its long side to the left and right sides. For example... Figure 3 As shown, the outer component 20 has an abdominal outer layer 21, a back outer layer 22, an inner layer 23, waist elastic components 24 and 25, and a hip elastic component 26.

[0098] The outer ventral layer 21, outer dorsal layer 22, and inner layer 23 can be exemplified as soft sheet-like components such as non-woven fabric. The inner layer 23 forms the shape of the outer garment component 20 and is a sheet-like component that extends from the ventral side 1A through the crotch area 1B to the dorsal side 1C. The outer ventral layer 21 is positioned on the non-skin side of the ventral side 1A, closer to the skin than the inner layer 23. The outer ventral layer 21 overlaps with the waist joint 2 in the long side direction, and its length in the long side direction is the same as that of the waist joint 2. The outer dorsal layer 22 is positioned on the non-skin side of the ventral side 1C and a portion of the crotch area 1B, closer to the skin than the inner layer 23. The outer dorsal layer 22 overlaps with the waist joint 2 in the long side direction and extends further towards the crotch than the waist joint 2. In the unfolded state of the diaper 1, the ventral outer layer 21 and the dorsal outer layer 22 are separated along their long sides, with the inner layer 23 exposed to the outside as the non-skin side of the diaper 1.

[0099] The waist elastic members 24 and 25 and the hip elastic member 26 are elastic members that stretch and contract in the left-right direction, and can be exemplified as linear elastic members. For example... Figure 2 As shown, the waist elastic members 24 and 25 overlap with the waist joint 2 along their long sides. In the following description, the waist elastic member located on the ventral side 1A will also be referred to as the ventral waist elastic member 24, and the waist elastic member located on the dorsal side 1C will also be referred to as the dorsal waist elastic member 25. The hip elastic member 26 is located on the lower side (lower side in the vertical direction) further along the long side than the waist joint 2. In this embodiment, there are two hip elastic members 26, but this number is not particularly limited.

[0100] Furthermore, the waist elastic members 24 and 25 and the hip elastic member 26 are arranged vertically between the inner layer 23 and the abdominal outer layer 21 or the back outer layer 22, in the underwear-like configuration, and are fixed in a state of elongation in the lateral direction. Therefore, the outer garment 20 conforms to the wearer's waist and hips. Moreover, the waist elastic members 24 and 25 and the hip elastic member 26 may each have at least a portion that stretches in the lateral direction, or they may have curved portions in addition to the portion that stretches in the lateral direction.

[0101] The basic structure of diaper 1 has been described above, but the structure of diaper 1 described above is an example and is not limited thereto. For example, a liquid-permeable intermediate sheet (e.g., non-woven fabric) may be disposed between the top sheet 12 and the absorbent core 11. In addition, the outer garment component 20 of this embodiment is composed of a single component that is continuous in the long side direction from the ventral side to the dorsal side, but is not limited thereto. For example, the outer garment components on the ventral and dorsal sides may be composed of different components, exposing the non-skin side of the absorbent body 10 at the crotch, or a crotch outer garment component may be provided between the ventral and dorsal outer garment components that are different components, connecting them together.

[0102] <Elastic components under the crotch 40>

[0103] Figure 5 This diagram illustrates the configuration of the elastic component 40 in the crotch area. Figure 6 This diagram illustrates the configuration of a modified example of the elastic component 40 in the crotch area. Figure 5 and Figure 6 This is a partial top view of diaper 1 in its unfolded and extended state. Figure 5 and Figure 6 For the sake of convenience, the leak-proof wall part 50 and the leg elastic part 52 in the absorbent body 10 are omitted from the display, and the absorbent core 11 is represented by a solid line.

[0104] The diaper 1 has a "crotch elastic member 40" that stretches at least along its long side. The crotch elastic member 40 is located on the non-skin side of the absorbent core 11, and when viewed in the thickness direction, it is positioned overlapping with the absorbent core 11. In this embodiment, the diaper 1 has multiple linear elastic members (rubber threads) as the crotch elastic member 40. Figure 4 As shown, multiple groin elastic members 40 (5 linear elastic members) are arranged at intervals in the left-right direction between the back piece 13 and the elastic member cover piece 17. Each groin elastic member 40 is installed in a state of elongation along its long side. Furthermore, as described later... Figure 2 The accompanying drawings show only the telescopic portion of the crotch elastic member 40. Alternatively, the crotch elastic member 40 may be positioned between the absorbent core 11 (core wrapping sheet 18) and the back sheet 13.

[0105] Viewed in the thickness direction, the area divided by the stretchable portion of the crotch elastic member 40 is called the "crotch elastic region ER". At least a portion of the crotch elastic region ER is provided in the "crotch portion 1B", which is the central area when the diaper 1 in its unfolded and stretched state is divided into three equal parts along its long side. The crotch elastic region ER can be housed within the crotch portion 1B. Figure 5 , Figure 6The elastic area ER in the crotch can extend to the ventral side 1A. Furthermore, the elastic area ER in the crotch can be positioned across the central CL along the long side of the diaper 1, or it can be positioned further forward (ventral) or backward (dorsal) than the central CL. Additionally, the lengths of the multiple elastic components 40 in the crotch of the diaper 1 can be the same or different.

[0106] Specifically, the groin elastic region ER, in the case where multiple linear groin elastic members 40 are arranged at intervals in the left-right direction, is as follows. For example... Figure 5 As shown, the following area is defined as the groin elastic region ER: the area between the leftmost groin elastic member 40a and the rightmost groin elastic member 40b, which is the area enclosed by an imaginary line connecting the ventral end of the telescopic portion of each groin elastic member 40 arranged in the left-right direction and an imaginary line connecting the dorsal end of the telescopic portion of each groin elastic member 40 in the long side direction.

[0107] For example, such as Figure 5 As shown, when the five elastic components 40 in the groin area are of the same length, the elastic region ER in the groin area is rectangular. Specifically, Figure 5 The groin elastic region ER shown is a rectangular shape enclosed by the lateral ends ERa and ERb in the left-right direction and the ventral and dorsal ends ERc in the long-side direction. The lateral end ERa of the groin elastic region ER is the lateral end on the side of the groin elastic component 40a that is most far to the left in the left-right direction, and the lateral end ERb is the lateral end on the other side of the groin elastic component 40b that is most far to the right. The ventral end ERc of the groin elastic region ER is the ventral end of all groin elastic components 40, and the dorsal end ERd is the dorsal end of all groin elastic components 40.

[0108] like Figure 6 As shown, when the three central crotch elastic members 40 out of the five crotch elastic members 40 are longer, the central portion of the crotch elastic region ER in the left-right direction protrudes outward in the long-side direction. Specifically, Figure 6 The groin elastic region ER shown is roughly cross-shaped, surrounded by the lateral ends ERa and ERb in the left-right direction and the ventral and dorsal ends ERc in the long-side direction. The lateral end ERa of the groin elastic region ER is the lateral end on the side of the groin elastic component 40a that is most far to the left in the left-right direction, and the lateral end ERb is the lateral end on the other side of the groin elastic component 40b that is most far to the right. The ventral end ERc of the groin elastic region ER is the ventral end of the three central groin elastic components 40, and the dorsal end ERd is the dorsal end of the three central groin elastic components 40.

[0109] Furthermore, when the crotch elastic member 40 is a stretchable sheet (stretchable nonwoven fabric, stretchable film, etc.), the area where the stretchable sheet is disposed is designated as the crotch elastic region ER. When multiple stretchable sheets or flat rubbers are arranged at intervals in the left-right direction, the situation is the same as with linear elastic members. That is, the area between the left end of the leftmost crotch elastic member 40 (stretchable sheet or flat rubber) and the right end of the rightmost crotch elastic member 40 is designated as the crotch elastic region ER.

[0110] The crotch elastic member 40, which overlaps with the absorbent core 11 in the thickness direction, is integrally bonded to the absorbent core 11 via the backing sheet 13 using an adhesive or the like. Therefore, when the diaper 1 is worn, the crotch elastic member 40 contracts along its long side, and the absorbent core 11 is pushed towards the skin, becoming more easily deformable to fit snugly against the wearer's crotch. Thus, the absorbent core 11 provides a good snug fit against the wearer's crotch, making it difficult for excrement to leak out. Furthermore, it reduces discomfort during wear. Even after the absorbent core 11 absorbs excrement and increases in weight, it is less likely to sag, maintaining a snug fit against the wearer's crotch.

[0111] Specifically, when the elastic area ER in the crotch is located at the central portion CR in the left-right direction of the absorbent core 11, the central portion CR in the left-right direction of the absorbent core 11 is deformed into a convex shape towards the upper side (the wearer's crotch area). Therefore, it is difficult for a gap to be formed between the wearer's excretory opening (e.g., the urethral opening) and the absorbent core 11, which can prevent urine and other excretory fluids from leaking out of the wearer's skin to the outside of the diaper 1.

[0112] <Regarding the modification of absorbent core 11 and diaper 1>

[0113] As described above, the diaper 1 has a crotch elastic member 40. By contracting this crotch elastic member 40 along its long side, the absorbent core 11 becomes easily deformable, protruding and closely fitting the wearer's crotch area by pushing the absorbent core 11 towards the skin. This deformation of the absorbent core 11 towards the skin makes it easier for the protruding portion of the absorbent core 11 (the crotch area of ​​the diaper 1) to abut against the excretion opening of the wearer, thereby absorbing excrement discharged from the excretion opening more easily. The excretion opening for urine and other excrement is generally located on the front of the body.

[0114] However, there is a concern that if the wearer's body is too large or too small, the portion of the absorbent core 11 (diaper 1) that protrudes and deforms towards the skin may not properly abut against the wearer's excretory opening. Additionally, there is a concern that the longer the elastic component 40 is, the more the diaper 1 (absorbent core 11) will deform towards the skin, extending not only to the wearer's excretory opening but also to the portion that abuts against the buttocks. Given this concern, there is a risk that when a large amount of excrement is expelled, or when excrement travels along the portion of the absorbent core 11 (diaper 1) that protrudes towards the skin to the buttocks or further back, the excrement may not be properly absorbed, and may leak from the back of the diaper 1.

[0115] In contrast, the diaper 1 of the present invention is as follows: Figure 2 and Figure 7 As shown, the back side of the central CL in the long side direction has a back elastic member 27 with at least a portion that extends and retracts along the back side direction. Figure 7 yes Figure 2 An enlarged illustration of the central portion of diaper 1 in the left-right direction. Figure 7 For convenience, the leak-proof wall portion 50 and the leg elastic member 52 in the absorbent body 10 are omitted, and the absorbent core 11 is shown in solid lines. Furthermore, in the unfolded and extended states, the groin elastic region ER is positioned further to the ventral side than the back elastic member 27, and the length L2 of the long side from the back end ERd of the groin elastic region ER to the ventral end of the back elastic member 27 is longer than the length L1 of the groin elastic region ER in the long side direction (L1 < L2).

[0116] like Figure 2 and Figure 7 As shown, the back elastic member 27 is an elastic member 25 or 26 whose outer ends in the left-right direction are located further back than the center CL in the long-side direction. It is also the elastic member (hip elastic member 26) located closest to the abdomen among a plurality of elastic members (back waist elastic member 25, hip elastic member 26) located further back than the center CL in the long-side direction. The back elastic member 27 has a predetermined width, and the back elastic member 27 of the diaper 1 is a rubber thread with a predetermined thickness (length in the long-side direction). "Abdominal end of the back elastic member 27" refers to the end of the rubber thread with a predetermined thickness closest to the abdomen when the back elastic member 27 is a rubber thread, as in the diaper 1 of this embodiment. For example, when the back elastic member 27 is a stretchable sheet or the like, it is the end of the stretchable sheet closest to the abdomen.

[0117] Figure 8 This diagram illustrates the deformation of the absorbent core 11. (See figure.) Figure 8As shown, when the diaper 1 is worn, the diaper 1 contracts along its long side due to the contraction of the elastic member 40 in the crotch direction. This makes it easier for the portion of the absorbent core 11 that overlaps with the elastic region R in the crotch direction to protrude towards the skin, thus making it easier to provide a protrusion 11t in the absorbent core 11. The protrusion 11t is mainly provided in the portion that overlaps with the elastic region R in the crotch direction when viewed in the thickness direction, and the protrusion 11t protrudes towards the skin in a shape along the long side direction. Furthermore, since the absorbent core 11 is a highly rigid component in the diaper 1, the absorbent body 10 (diaper 1) also deforms along with the deformation of the absorbent core 11 caused by the contraction of the elastic member 40. Therefore, the shape of the absorbent core 11 will be described in detail.

[0118] Furthermore, compared to the length L1 of the groin elastic region ER, the length L2 of the long side from the dorsal end ERd of the groin elastic region ER to the ventral end of the dorsal elastic member 27 is longer (L1 < L2). Therefore, compared to the case where the length L2 is shorter than the length L1, the contraction of the dorsal elastic member 27, which is located on the dorsal side of the groin elastic region ER, makes it easier for the part on the dorsal side of the groin elastic region ER to deform so that the central part in the left and right direction is concave towards the non-skin side. This makes it easier to provide a recessed portion 11k in the absorbent core 11.

[0119] In other words, when the diaper 1 is viewed in the thickness direction, the part of the absorbent core 11 that overlaps with the elastic area ER in the crotch is easily deformed and has a protrusion 11t. In the long side direction, between the rear end ERd of the elastic area ER in the crotch and the ventral end of the dorsal elastic member 27, a recess 11k is easily deformed.

[0120] By providing a protrusion 11t in the absorbent core 11, it becomes easier for the diaper 1 (absorbent core 11) to come into contact with the excretion opening in the wearer's body, making it easier to absorb excrement discharged from the wearer's excretion opening, and making it easier to accumulate excrement in the recess 11k located further back than the protrusion 11t. Therefore, even in cases where a large amount of excrement is discharged at once, even if the portion of the protrusion 11t where the absorbent core 11 is provided cannot completely absorb the excrement, the recess 11k located further back than the protrusion 11t easily retains the excrement in the state of accumulation, thus reducing concerns about excrement leakage from the diaper 1.

[0121] In addition, such as Figure 7As shown, regarding the crotch elastic member 40 in the diaper 1, it is preferable that the dorsal end ERd of the crotch elastic region ER is located at a position closer to the ventral side than the dorsal end Fe of the folding portion F for folding the diaper 1, which is located at the center of the long side of the diaper 1. By positioning the dorsal end ERd of the crotch elastic region ER closer to the ventral side than the dorsal end Fe of the folding portion F, compared to the case where the dorsal end ERd of the crotch elastic region ER is positioned further back than the dorsal end Fe of the folding portion F, when the diaper 1 is worn, the contraction of the crotch elastic member 40 makes it easier for the absorbent core 11 to deform and form a protrusion 11t at a position closer to the ventral side than the dorsal end Fe of the folding portion F, and also makes it easier for the absorbent core 11 to deform and form a recess 11k at a position further back than the folding portion F. Therefore, by providing the protrusion 11t in the absorbent core 11, it becomes easier for the diaper 1 (absorbent core 11) to come into contact with the wearer's excretory opening during wear, thereby improving the absorbency of excrement. In addition, the recessed portion 11k can be used as a space for accumulating excrement, which can alleviate concerns about excrement leakage.

[0122] Furthermore, regarding the crotch elastic member 40 in the diaper 1, it is more preferable that the dorsal end ERd of the crotch elastic region ER is positioned further ventrally than the central CL in the long side direction of the diaper 1. Therefore, by positioning the dorsal end ERd of the crotch elastic region ER further ventrally than the central CL, compared to the case where the dorsal end ERd of the crotch elastic region ER is positioned further ventrally than the central CL, when the diaper 1 is worn, the contraction of the crotch elastic member 40 makes it easier for the absorbent core 11 to deform and form a protrusion 11t at the ventrally position further ventrally than the central CL, and also makes it easier for the absorbent core 11 to deform and form a recess 11k at the ventrally position further ventrally than the central CL.

[0123] Regarding such a diaper 1, it is preferable to have a deformation-suppressing portion located further back than the inseam elastic region ER and further ventrally than the dorsal elastic member 27, for suppressing deformation of the absorbent core 11 caused by the contraction of the inseam elastic member 40. This deformation-suppressing portion has a portion along the left-right direction. By having a deformation-suppressing portion located between the inseam elastic region ER and the dorsal elastic member 27 in the long side direction, when the diaper 1 is worn, the deformation of the protrusion 11t of the absorbent core 11 caused by the contraction of the inseam elastic member 40 located further ventrally than the deformation-suppressing portion facilitates the diaper 1 to come into contact with the wearer's excretory opening. Furthermore, the deformation-suppressing portion located between the inseam elastic region ER and the dorsal elastic member 27 can suppress deformation of the absorbent core 11 caused by the contraction of the inseam elastic member 40. Furthermore, by suppressing the deformation of the absorbent core 11 through the deformation suppression part, the central part of the portion between the deformation suppression part and the back elastic member 27 in the long side direction of the absorbent core 11, which is concave to the non-skin side, becomes more prone to deformation due to the contraction of the back elastic member 27 in the left and right directions.

[0124] In other words, when worn, in the elastic area ER of the crotch, the protrusion 11t (the part of the diaper 1 that protrudes towards the skin) provided in the absorbent core 11, which is caused by the contraction of the elastic member 40 of the crotch, easily abuts against the wearer's excretion opening. Furthermore, the deformation-inhibiting portion, located further back than the elastic area ER of the crotch, cuts off or mitigates the deformation of the absorbent core 11 caused by the contraction of the elastic member 40. Therefore, the portion further back than the deformation-inhibiting portion becomes less susceptible to deformation of the absorbent core 11 caused by the contraction of the elastic member 40, and the absorbent core 11 easily forms a recess 11k on the non-skin side opposite to the portion of the absorbent core 11 that is further back than the deformation-inhibiting portion.

[0125] As a result, the part closer to the abdomen than the deformation inhibition part protrudes towards the wearer's skin due to the elastic part under the crotch 40, making it easier for the diaper 1 to come into contact with the wearer's excretion opening and absorb excrement. Furthermore, the absorbent core 11 closer to the back than the deformation inhibition part becomes easier to have a recess 11k provided, thus making it easier to provide a space for accumulating excrement and reducing concerns about excrement leaking from the diaper 1.

[0126] Regarding the deformation suppression part, the deformation suppression part of the diaper 1 in this embodiment is the fold part F. As described above, the fold part F is a fold line formed by folding the diaper 1 in the long side direction in its unfolded and stretched state. The fold part F is a so-called valley fold, where the skin side is folded inward, and when worn, the fold part F becomes a part with a valley fold. On the other hand, the protrusion 11t of the absorbent core 11 formed by the contraction of the crotch elastic member 40 is a so-called mountain fold, where the skin side bulges towards the skin side. In other words, the fold part F is provided along the left-right direction on the side of the absorbent core 11 folded opposite to the deformation of the protrusion 11t, thereby making it easier to counteract the mountain fold of the protrusion 11t along the long side direction by the fold part F with a valley fold along the left-right direction, thus making it easier to suppress the deformation of the protrusion 11t. Therefore, the fold part F functions as a deformation suppression part.

[0127] As described above, when the diaper 1 is worn, the diaper 1 deforms due to the contraction of the elastic member 40 at the crotch, causing the protrusion 11t of the absorbent core 11 to deform, making it easier for the diaper 1 to come into contact with the wearer's excretion opening. Furthermore, since the deformation-inhibiting part is the fold F, it is not necessary to provide a separate deformation-inhibiting part. Moreover, by providing the deformation-inhibiting part composed of the fold F in the diaper 1, the fold F along the left-right direction counteracts or mitigates the protrusion of the protrusion 11t of the absorbent core 11 along its long side towards the skin, thereby facilitating deformation so that the portion of the absorbent core 11 further back than the fold F is recessed towards the non-skin side following the crease of the fold F. Therefore, the portion further back than the fold F is more likely to form the protrusion 11t, and the portion further back than the fold F is more likely to form the recess 11k. As a result, when worn, the elastic part 40 in the crotch causes the absorbent core 11 to deform and a protrusion 11t is provided, which makes it easy for the diaper 1 (protrusion 11t) to come into contact with the wearer's excretion opening, improving the absorbency of excrement. It also becomes easier to deform on the back side than the fold F, so that the central part in the left and right directions is recessed towards the non-skin side. Since the recessed part 11k towards the non-skin side makes it easy to provide a space for accumulating excrement, the concern of excrement leaking from the diaper 1 can be reduced.

[0128] Furthermore, the deformation suppression part is not limited to the folded part F. As a deformation suppression part, an example can be a portion in the absorbent core 11 whose rigidity changes compared to the surrounding area.

[0129] The deformation-inhibiting portion can also be a pressing portion (not shown) formed by pressing the absorbent core 11 in the thickness direction. The pressing portion, by pressing the absorbent core 11, becomes more rigid than its surroundings, thus becoming a part whose rigidity has changed. Since this pressing portion has a portion along the left-right direction and is positioned further back than the groin elastic area ER and further ventrally than the back elastic member 27, the pressing portion along the left-right direction counteracts or mitigates the protrusion 11t of the absorbent core 11 along its long side towards the skin, making it easier for the portion further back than the pressing portion to deform and indent towards the non-skin side. Therefore, the portion further ventrally than the pressing portion easily forms the protrusion 11t, and the portion further back than the pressing portion easily forms the indentation 11k. As a result, when worn, the elastic part 40 in the crotch contracts and a protrusion 11t is provided in the absorbent core 11, which makes it easy for the diaper 1 (protrusion 11t) to come into contact with the wearer's excretion opening, improving the absorbency of excrement. Furthermore, a recess 11k is provided on the back side, which makes it easier to provide space for the accumulation of excrement, thereby alleviating concerns about excrement leaking from the diaper 1.

[0130] The deformation-inhibiting portion can also be a low-weight portion (not shown) where the basis weight of the absorbent core 11 is lower than that of its surroundings. The low-weight portion is a part whose rigidity changes by becoming less rigid compared to its surroundings. For example, a low-weight portion refers to a portion where the basis weight of the liquid absorbent fiber or superabsorbent polymer (SAP) is lowered by creating a slit through the absorbent core 11 in the thickness direction or by providing a groove in the absorbent core 11. Since this low-weight portion has a portion along the left-right direction and is located further back than the groin elastic region ER and further ventrally than the back elastic member 27, the low-weight portion along the left-right direction counteracts or mitigates the protrusion 11t of the absorbent core 11 along its long side towards the skin, making it easier for the portion further back than the low-weight portion to deform and concave towards the non-skin side. Therefore, the portion further ventrally than the low-weight portion is more likely to form a protrusion 11t, and the portion further back than the low-weight portion is more likely to form a depression 11k. As a result, when worn, the diaper 1 (protrusion 11t) can easily come into contact with the wearer's excretion opening, improving the absorbency of excrement. Furthermore, a recessed portion 11k is provided on the back side, which makes it easier to provide space for the accumulation of excrement, thereby alleviating concerns about excrement leaking from the diaper 1.

[0131] The diaper 1, as a deformation-inhibiting part, can not only have a folding part F that folds the diaper 1 in the left-right direction, but also a squeezing part or a low-weight part in the left-right direction based on the folding part F. That is to say, the diaper 1 can also have multiple deformation-inhibiting parts. By having not only a squeezing part or a low-weight part in the left-right direction, but also a folding part F, it is easier to suppress the deformation of the absorbent core 11 caused by the elastic member 40 in the crotch area.

[0132] Alternatively, the deformation-inhibiting part in diaper 1 can also be an elastic member with a portion capable of stretching and contracting in the left-right direction. For example, diaper 1 may also have a curved elastic member (not shown) with its outer ends in the left-right direction located more ventrally than the center CL in the long-side direction, and this curved elastic member has a portion where its central portion in the left-right direction is positioned more dorsally than the crotch elastic member 40. With this curved elastic member, it becomes easier to suppress the deformation of the absorbent core 11 caused by the crotch elastic member 40. Furthermore, the curved elastic member only needs to have its outer ends in the left-right direction located more ventrally than the center CL in the long-side direction; the entire curved elastic member can also be located more ventrally than the center CL in the long-side direction, and the curved elastic member can have a portion located more ventrally than the center CL in the long-side direction and a portion located more dorsally than the center CL. When the curved elastic member has a portion located more dorsally than the center CL in the long-side direction, it is preferable that the dorsal end of the curved elastic member is located between the rear end ERd of the crotch elastic region ER in the long-side direction and the ventrally end of the dorsal elastic member 27.

[0133] The following describes the structure of a diaper 1 with a folded portion F as a deformation suppression part. However, even if the deformation suppression part is a part that changes rigidity, such as a squeezing part or a low-weight part, the following features can still be applied.

[0134] like Figure 7As shown, regarding the folded portion F, which serves as a deformation-suppressing part, it is preferable that the folded portion F has a portion that overlaps with the elastic region ER in the crotch area. Simply put, an imaginary region extending the elastic region ER in the crotch area toward the back intersects with the folded portion F. Therefore, in the absorbent core 11, since the protrusion 11t, which deforms in a manner that protrudes along the long side direction, is suppressed at the folded portion F, which is orthogonal to the long side direction, it becomes easier to provide a recessed portion 11k that causes the absorbent core 11 to be recessed toward the non-skin side at a location further back than the folded portion F. Therefore, when worn, the elastic part 40 in the crotch contracts, causing the absorbent core 11 to deform and a protrusion 11t is provided. This makes it easy for the diaper 1 (protrusion 11t) to come into contact with the wearer's excretion opening, improving the absorbency of excrement. Furthermore, it becomes easier to deform into a central portion that is recessed towards the non-skin side in the left-right direction at a location further back than the folded portion F. This recessed portion 11k towards the non-skin side makes it easier to provide a space for accumulating excrement, thereby alleviating concerns about excrement leaking out of the diaper 1.

[0135] Furthermore, it is preferable that the length Wf of the folded portion F, which serves as the deformation suppression part, is longer in the left-right direction than the length Wa of the elastic region ER in the crotch (Wa < Wf). The longer the length Wf of the folded portion F in the left-right direction, the easier it becomes to suppress the deformation of the absorbent core 11 caused by the elastic member 40 in the crotch. Because the lateral length Wa of the folded portion F is longer than that of the lateral length Wa of the elastic area ER in the crotch area of ​​the diaper 1 in the lateral direction, when worn, the elastic part 40 in the crotch area causes the absorbent core 11 to deform and a protrusion 11t is provided. This makes it easier for the diaper 1 (protrusion 11t) to come into contact with the wearer's excretion opening, improving the absorbency of excrement. Compared with the case where the lateral length Wa of the elastic area ER in the crotch area is longer than the lateral length Wf of the folded portion F, the diaper 1 is more likely to deform in a way that the central part in the lateral direction is recessed towards the non-skin side at a position further back than the folded portion F. This recessed portion 11k towards the non-skin side makes it easier to provide space for the accumulation of excrement, thereby reducing concerns about excrement leaking out of the diaper 1.

[0136] like Figure 7 As shown, preferably, when viewed in the thickness direction, the average weight of the absorbent core 11 overlapping the portion from the dorsal end ERd of the inseam elastic region ER to the ventral end of the dorsal elastic member 27 is greater than the average weight of the absorbent core 11 in the region overlapping the inseam elastic region ER. Figure 7 In the diagram, the elastic region ER in the groin area is represented by a mesh-like shaded area. The portion of the absorbent core 11 that overlaps with the elastic region ER in the thickness direction is also the area of ​​the mesh-like shaded area. Figure 7In the middle, the overlapping portion of the absorbent core 11, which extends from the dorsal end ERd of the crotch elastic region ER to the ventral end of the dorsal elastic member 27, is the area indicated by a shadow sloping downward to the left. As such, when observing the diaper 1 in the thickness direction, the average weight of the absorbent core 11 that overlaps with the portion from the dorsal end ERd of the crotch elastic region ER to the ventral end of the dorsal elastic member 27 is greater than the average weight of the absorbent core 11 in the area overlapping with the crotch elastic region ER. Therefore, compared to the case where the average weight of the absorbent core 11 that overlaps with the portion from the dorsal end ERd of the crotch elastic region ER to the ventral end of the dorsal elastic member 27 is set to be lower than the average weight of the absorbent core 11 in the area overlapping with the crotch elastic region ER, the excrement not absorbed by the crotch elastic region ER moves to the dorsal side more than the crotch elastic region ER. Even if the excrement is accumulated in the recess 11k that is recessed to the non-skin side more than the crotch elastic region ER, it becomes easier for the excrement to be absorbed in the recess 11k of the absorbent core 11. Therefore, during wear, by deforming the absorbent core 11 with a protrusion 11t based on the crotch elastic member 40, the diaper 1 can easily come into contact with the wearer's excretion opening and easily absorb excrement. Even if the protrusion 11t and the crotch elastic area ER cannot completely absorb excrement, the excrement is stored in a part further back than the crotch elastic area ER, which becomes easier to absorb, thus alleviating concerns about excrement leaking from the diaper 1.

[0137] Furthermore, preferably, in the left-right direction, the absorbent core 11 does not have a low-weight portion with a lower basis weight than the surrounding area in the region overlapping with the groin elastic region ER. To put it simply, as... Figure 7 As shown, it is preferable that the absorbent core 11 has a low basis weight portion on both sides of the elastic area ER in the crotch, without a low basis weight portion. As described above, the low basis weight portion of the absorbent core 11 refers to the portion where the basis weight of the liquid absorbent fiber or superabsorbent polymer (SAP) is reduced by creating a slit through the absorbent core 11 in the thickness direction or by providing a groove in the absorbent core 11. By having such an absorbent core 11 in the diaper 1, concerns about excessive reduction in rigidity in the area where the absorbent core 11 overlaps with the elastic area ER in the left-right direction can be alleviated. Therefore, even if the diaper 1 easily comes into contact with the wearer's excretion opening due to deformation of the absorbent core 11 caused by the contraction of the elastic member 40 during wear, concerns about undesirable deformation of the absorbent core 11 in the area overlapping with the elastic area ER in the left-right direction due to the force from the outer to the inner side of the wearer's thigh can be alleviated.

[0138] As described above, the diaper 1 has a waist joint 2 that joins the two sides of the abdominal side (abdominal waistband) 1A and the back side (back waistband) 1C, and a leak-proof elastic member (long-side elastic member) 51 that extends and retracts along its long side. The leak-proof elastic member 51 is an elastic member used to lift the leak-proof wall 50. Figure 2 As shown, the leak-proof elastic member 51 is located on the outer side in the left-right direction, further than the groin elastic region ER, and has at least a portion located on the back side, further than the groin elastic member 40. In this embodiment, the leak-proof elastic member 51 of the diaper 1 is located on the outer side, further than the side ends ERa and ERb of the groin elastic region ER, and the ventral end of the leak-proof elastic member 51 is located on the ventral side, further than the ventral end ERc of the groin elastic region ER, and the dorsal end of the leak-proof elastic member 51 is located on the dorsal side, further than the dorsal end ERd of the groin elastic region ER. Furthermore, in the longitudinal direction, relative to the central CL located on the dorsal side, the diaper 1 has multiple elastic members (dorsal waist elastic member 25, hip elastic member 26) including the dorsal elastic member 27.

[0139] Furthermore, preferably, when the diaper 1 is viewed in the thickness direction, the portion where the absorbent core 11, the back waist elastic member 25, and the leak-proof wall elastic member 51 overlap, and among the multiple elastic members (back waist elastic member 25, hip elastic member 26), the back waist elastic member 25 is positioned in the long side direction at a position overlapping with the waist joint 2. The diaper 1 of this embodiment is as follows... Figure 2 As shown, viewed in the thickness direction, there is an overlapping portion of the absorbent core 11, the back waist elastic members 25a and 25b, and the leak-proof wall elastic member 51.

[0140] By contracting the leak-proof elastic members 51 provided on both sides of the absorbent body 10 in the left and right directions, a force is applied to the absorbent core 11 as a whole, causing the absorbent core 11 to deform into a curved shape such that the central part in the long side direction is concave towards the non-skin side. Because the back waist elastic member 25 overlaps with the waist joint 2 in the long side direction and is supported at the waist joint 2, the force of contraction in the left and right directions is more effective than that of the hip elastic member 26, which is not supported at the waist joint 2.

[0141] In this way, the diaper 1, by having a leak-proof elastic member 51 along the long side of the leak-proof wall portion 50, allows the absorbent core 11 to deform easily and conform to the wearer's body when worn, by contracting the leak-proof elastic member 51, or by making the leak-proof wall portion 50 stand up to block excrement, thereby easily reducing the leakage of excrement. Furthermore, by having back waist elastic members 25a and 25b that overlap with the absorbent core 11 in the thickness direction and are supported at the waist joint 2, the back waist elastic members 25a and 25b expand and contract in the left and right directions, making it easier to keep the absorbent core 11 flat and to expand the absorbent core 11 outwards in the left and right directions. Therefore, it becomes easier for the portion further back than the groin elastic area ER to deform, causing the central portion in the left and right directions to concave towards the non-skin side to form a recess 11k, thereby making it easier for excrement to accumulate in the recess 11k. Because excrement easily accumulates in the space of the recess 11k, even when a large amount of excrement is discharged at once and the excrement is not completely absorbed by the protrusion 11t of the absorbent core 11, the concern about excrement leaking from the diaper 1 can be alleviated.

[0142] In addition, such as Figure 5 , 7 As shown, preferably, the absorbent core 11 has a narrowest portion 11n with the narrowest width (Wn) in the left-right direction on its inner side in the long side direction. Preferably, it has a widest portion 11h, which is located further back in the long side direction than the narrowest portion 11n, and the width (Wh) of the widest portion 11h in the left-right direction is the widest in the long side direction than the central CL. In this embodiment, the narrowest portion 11n of the absorbent core 11 of the diaper 1 has a length Wn in the left-right direction, and is the shortest portion in the absorbent core 11 in the left-right direction, located further back in the long side than the central CL. The widest portion 11h is located further back in the long side than the narrowest portion 11n, and is located at the end of the absorbent core 11 on the back side. In addition, the widest portion 11h has a length Wh in the left-right direction, which refers to the portion of the absorbent core 11 with the longest left-right direction in the long side direction, located further back in the long side than the central CL. Furthermore, the length in the left-right direction of the ventral end of the absorbent core 11 of the diaper 1 in this embodiment is approximately the same as the length Wh in the left-right direction of the widest portion 11h of the dorsal end of the absorbent core 11.

[0143] In the case of such an absorbent core 11, such as Figure 7As shown, preferably, the crotch elastic region ER has a portion overlapping with the narrowest part 11n in the long side direction. The crotch area is where the wearer's excretory opening is located, but since it is a part where the absorbent core 11 is easily subjected to a force from the outside to the inside in the left-right direction by the wearer's legs (thighs), the narrowest part 11n of the absorbent core 11 is usually provided at a position corresponding to the wearer's crotch area during wear to improve the wearer's leg circumference mobility or reduce discomfort during wear. On the other hand, because the absorbent core 11 is relatively short in the left-right direction, the narrowest part 11n makes it easier for the contraction force of the crotch elastic member 40 to function. Therefore, since the crotch elastic region ER has a portion overlapping with the narrowest part 11n in the long side direction, the absorbent core 11 is easily deformed by the contraction of the crotch elastic member 40, making it easy to bring the narrowest part 11n of the absorbent core 11 against the wearer's excretory opening. This improves the absorbency of excrement and makes it easier to improve the fit when wearing the garment or reduce discomfort caused by the rigidity of the absorbent core 11.

[0144] Furthermore, as described above, it is preferable that the diaper 1 has a pair of leak-proof wall portions 50, each pair of leak-proof wall portions 50 having a leak-proof wall elastic member 51 that stretches and contracts in the longitudinal direction, and that, when viewed in the thickness direction, the diaper 1 does not have a portion where the narrowest part 11n of the absorbent core overlaps with the leak-proof wall elastic member 51. Figure 2 As shown, in this embodiment, the narrowest part 11n of the absorbent core 11 of the diaper 1 is located further inside in the left-right direction than the leak-proof elastic member 51. Therefore, when viewed in the thickness direction, the narrowest part 11n does not overlap with the leak-proof elastic member 51. Because the absorbent core 11 has a narrowest part 11n, it is easier to reduce the discomfort of the leg opening caused by the rigidity of the absorbent core 11 when wearing it. Furthermore, the deformation of the absorbent core 11 protruding towards the skin due to the contraction of the crotch elastic member 40 makes it easy to abut the narrowest part 11n of the absorbent core 11 against the wearer's excretion opening.

[0145] Furthermore, in the case of having such an absorbent core 11, it is preferable that, as Figure 7As shown, the widest portion 11h is provided in the longitudinal direction, further back than the elastic area ER in the crotch. In the diaper 1, the widest portion 11h is the longest part of the absorbent core 11 in the longitudinal direction, further back than the center CL, and the back end ERd of the elastic area ER in the crotch is provided in the longitudinal direction of the diaper 1, further back than the center CL. In this way, by having the widest portion 11h of the absorbent core 11 in the longitudinal direction, further back than the elastic area ER in the crotch, it becomes easier to deform the portion of the absorbent core 11 further back than the elastic area ER in the crotch, so that the central portion in the lateral direction is recessed towards the non-skin side (in such a way as to form a recessed portion 11k). Therefore, it becomes easier to provide a space for accumulating excrement by providing this recessed portion 11k that is recessed towards the non-skin side, so that even if a large amount of excrement is discharged at once during wearing, the concern about excrement leaking from the diaper 1 can be reduced.

[0146] And, as Figure 5 , 7 As shown, preferably, in the long side direction, the absorbent core 11 has an inclined portion 11m between the narrowest portion 11n and the widest portion 11h, where the side end of the absorbent core 11 slopes from the ventral side to the dorsal side and from the inner side to the outer side in the left-right direction. In this embodiment, the inclined portions 11m of the diaper 1 are respectively provided on both sides of the absorbent core 11, and are the portions connecting the narrowest portion 11n and the widest portion 11h.

[0147] Furthermore, preferably, the absorbent core 11 has a narrowest portion 11n, a widest portion 11h, and an inclined portion 11m, as described above. When the diaper 1 has a folded portion F as a deformation-inhibiting part, at least a portion of the folded portion F overlaps with the inclined portion 11m in the long-side direction. Figure 7 As shown, in the diaper 1 of this embodiment, the entire area of ​​the folded portion F overlaps with the inclined portion 11m in the long side direction, and the inclined portion 11m is also provided in the long side direction at a position further back than the folded portion F.

[0148] In this way, by having an inclined portion 11m in the absorbent core 11, extending from the abdominal side to the back side in the left-right direction, further back than the elastic area ER in the crotch, concerns about the absorbent core 11 bending due to forces from the outer sides (the wearer's legs) in the left-right direction can be alleviated. Furthermore, the fold portion F suppresses deformation of the protrusion 11t along the long side of the absorbent core 11 caused by the elastic member 40 in the crotch, and the inclination of the inclined portion 11m, located further back than the fold portion F, facilitates deformation of the portion further back than the fold portion F, causing the central portion in the left-right direction to concave towards the non-skin side to form a recessed portion 11k. Thus, the recessed portion 11k facilitates the provision of a space for accumulating excrement, reducing concerns about leakage from the diaper 1 even when a large amount of excrement is expelled at once during wear.

[0149] Furthermore, in this embodiment, the diaper 1 has a folded portion F, which serves as a deformation-inhibiting portion, overlapping with the inclined portion 11m in the long side direction, but this is not a limitation. For example, the absorbent core 11 may have a narrowest portion 11n at its central portion in the long side direction, and at least a portion of the folded portion F, which serves as a deformation-inhibiting portion in the long side direction, may overlap with the narrowest portion 11n (not shown). The narrowest portion 11n of the absorbent core 11 is less likely to be subjected to force from the outer side to the inner side in the left-right direction when worn than the widest portion 11h. This reduces concerns that the central portion of the absorbent core 11 in the left-right direction may deform and protrude towards the skin due to force applied from both sides in the left-right direction to the absorbent core 11 during wear. Therefore, since at least a portion of the folded portion F, which serves as a deformation-inhibiting portion, overlaps with the narrowest portion 11n in the long side direction, it becomes easier to suppress the deformation of the absorbent core 11 caused by the elastic member 40 in the crotch area. Therefore, when worn, the elastic member 40 located on the groin side, which is located further on the abdomen than the fold F, causes the absorbent core 11 to deform and form a protrusion 11t. This makes it easy for the diaper 1 (protrusion 11t) to come into contact with the wearer's excretion opening, improving the absorbency of excrement. Furthermore, it becomes easier to deform in a position further on the back side than the fold F, causing the central part in the left-right direction to be recessed towards the non-skin side. Since it becomes easier to provide a space for accumulating excrement through this recessed part 11k that is recessed towards the non-skin side, concerns about excrement leaking out of the diaper 1 can be alleviated.

[0150] Additionally, when observing diaper 1 from the skin side, if... Figure 7As shown, the absorbent core 11 has a narrowest portion 11n, a widest portion 11h, and an inclined portion 11m. The shape of the absorbent core 11 as viewed from the skin side refers to the overall shape of one or more absorbent cores 11. The diaper 1 of this embodiment does not have multiple absorbent cores overlapping in the thickness direction; it is a single-layer component. Therefore, the shape of the absorbent core 11 is the shape (outer profile) of one absorbent core 11. When the absorbent core is formed by overlapping multiple absorbent components (absorbent cores) of different shapes in the thickness direction—for example, when an absorbent core is formed by overlapping absorbent components made of pulp fibers molded into a predetermined shape and absorbent components made of SAP sheets formed of highly absorbent polymers (SAP) in the thickness direction—the shape of the absorbent core as viewed from the skin side is the overall shape of the absorbent core composed of the two overlapping absorbent components. The narrowest portion 11n in the shape of the absorbent core 11 as viewed from the skin side is the narrowest portion in the left-right direction, located on the inner side in the long side direction. The widest part 11h of the absorbent core 11, when viewed from the skin side, is the widest part in the left-right direction, located further back than the narrowest part 11n in the long side direction. The inclined part 11m of the absorbent core 11, when viewed from the skin side, is the part located between the narrowest part 11n and the widest part 11h in the long side direction, and is the part where the side end of the absorbent core 11 slopes from the ventral side to the dorsal side and from the inner side to the outer side in the left-right direction.

[0151] Furthermore, in the case of such an absorbent core 11, it is preferable that at least a portion of the inclined portion 11m is located on the back side further than the elastic region ER in the crotch direction.

[0152] The absorbent core 11, when viewed from the skin side, has an inclined portion 11m. This allows the absorbent core 11 to extend from the ventral side towards the back, further back than the elastic area ER in the groin direction. This reduces concerns about the absorbent core 11 bending due to forces from the outer sides (the wearer's legs). Furthermore, the fold F suppresses deformation of the protrusion 11t along the long side of the absorbent core 11 caused by the elastic member 40 in the groin direction. The inclined portion 11m, located further back than the fold F, facilitates deformation of the portion further back than the fold F, causing the central portion in the lateral direction to concave towards the non-skin side, forming a recess 11k. This allows for the creation of a space for accumulating excrement through the recess 11k, reducing concerns about leakage from the diaper 1 even when a large amount of excrement is expelled at once during wear.

[0153] In addition, as described above, the absorbent body 10 of the diaper 1, which has an absorbent core 11, is fixed in the adhesive area to the outer part (outer body) 20, which has a ventral side (ventral waist portion) 1A and a dorsal side (dorsal waist portion) 1C. Figure 9 This diagram illustrates the bonding area FR where the absorbent body 10 is fixed to the outer component 20. Figure 9 In the diagram, the shape of the absorbent body 10 is represented by thick lines, omitting the leak-proof elastic component 51 and the leg elastic component 52 within the absorbent body. Furthermore, for convenience, the bonding area FR between the absorbent body 10 and the outer component 20 is represented by a solid line, and the bonding area FR is indicated by a diagonal line sloping downwards to the left. Figure 9 As shown, in the absorbent body 10, in the long side direction, the area that partially overlaps with the portion extending from the dorsal end ERd of the crotch elastic region ER to the ventral end of the dorsal elastic member 27 is designated as region R27. In the absorbent body 10, in the long side direction, the area that overlaps with the crotch elastic region is designated as region RE. Preferably, the area of ​​the adhesive region FR per unit area in region R27 is larger than the area of ​​the adhesive region FR per unit area in region RE.

[0154] In this embodiment, the diaper 1 has a rectangular adhesive region FR of equal length in both the left and right directions at the center of the absorbent body 10 in both regions RE and R27. There are no adhesive regions FR on either side of region RE in the left and right directions, while there are adhesive regions FR on both sides of region R27 in the left and right directions. Therefore, it is obvious that the area of ​​adhesive region FR per unit area in region R27 is larger than the area of ​​adhesive region FR per unit area in region RE.

[0155] In this way, because the area of ​​the adhesive region FR per unit area in region R27 is larger than the area of ​​the adhesive region FR per unit area in region RE, it becomes easier to reduce deformation such as shrinkage and bending in region R27 of the absorbent core 11 and diaper 1 compared to the case where the area of ​​the adhesive region FR per unit area in region RE is set to be larger than the area of ​​the adhesive region FR per unit area in region R27. Therefore, since it becomes easier to keep a portion of region R27 of the absorbent core 11 flat, it becomes easier to accumulate excrement in the space created by the recess 11k when the absorbent core 11 is deformed to form a recess 11k on the back side further than the elastic region RE in the crotch.

[0156] like Figure 1 As shown, in the underwear-style configuration, the two sides of the ventral side 1A and the back side 1C of the diaper 1 are joined at the waistband joint 2. Furthermore, as... Figure 2As shown, the diaper 1 in its unfolded and stretched state has multiple elastic members (back waist elastic member 25, hip elastic member 26) located further back than the center CL in the long side direction, including a back elastic member 27. Preferably, among these multiple elastic members, all the elastic members located further on the abdominal side than the waist joint 2 are discontinuous at their central portions in the left-right direction. Figure 2 As shown, in this embodiment, the elastic members provided on the diaper 1 further to the abdomen than the waist joint 2 are two buttock elastic members 26, 26, which are discontinuous in the central portion in the left-right direction. Methods for making the elastic members discontinuous include, for example, cutting off the central portion in the left-right direction during manufacturing, or providing elastic members only on the sides in the left-right direction without providing them in the central portion. In this way, by making all the elastic members (buttock elastic members 26) further to the abdomen than the waist joint 2 discontinuous in the central portion in the left-right direction, concerns about the absorbent core 11 being reduced in the left-right direction due to the elastic members (buttock elastic members 26) are alleviated, making it easier to keep the absorbent core 11 flat and thus easier to expand outwards in the left-right direction. Therefore, it becomes easier to deform the portion further to the back than the groin elastic area ER, causing the central portion in the left-right direction to be recessed towards the non-skin side, easily forming a recess 11k, thus making it easier for excrement to accumulate in the recess 11k. Because excrement easily accumulates in the recessed portion 11k, in cases where the protrusion 11t of the absorbent core 11 fails to completely absorb excrement or a large amount of excrement is discharged at once, the concern about excrement leaking from the diaper 1 can be alleviated.

[0157] Furthermore, more preferably, among the multiple elastic members (back waist elastic member 25, hip elastic member 26) located further back than the central CL in the long side direction, the elastic member located on the farthest side in the long side direction, namely the back waist elastic member 25a, which overlaps with the waist joint 2, is discontinuous in the central portion in the left-right direction. This alleviates concerns about the absorbent core 11 being reduced in the left-right direction due to the back waist elastic member 25a, as it becomes easier to maintain the absorbent core 11 as a flat surface, thus facilitating its expansion outwards in the left-right direction. Consequently, it becomes easier for the portion further back than the crotch elastic area ER to deform, causing the central portion in the left-right direction to concave towards the non-skin side, easily forming a recess 11k, and thus making it easier for excrement to accumulate in the space of the recess 11k. Furthermore, among the multiple back waist elastic members 25, the more the number of discontinuous back waist elastic members 25 in the central part of the left and right direction increases, the fit to the wearer's waist will decrease when wearing. Therefore, it is preferable to limit the number of discontinuous back waist elastic members 25 in the central part of the left and right direction to one (only back waist elastic member 25a) or at most two.

[0158] Furthermore, regarding the multiple elastic members (back waist elastic member 25 and hip elastic member 26) located further back than the central CL in the long side direction, among these multiple elastic members, the back waist elastic member 25 is located in a position overlapping the waist joint 2 in the long side direction, and the hip elastic member 26 is located further to the abdomen than the waist joint 2 in the long side direction. Regarding these multiple elastic members, the maximum value of the interval between adjacent back waist elastic members 25 in the long side direction is defined as interval d1, and the maximum value of the interval between adjacent hip elastic members 26 in the long side direction is defined as interval d2. Preferably, interval d1 is smaller than interval d2 (d1 < d2). Therefore, when worn, the elastic back waistband 25, located at the position overlapping the waistband joint 2 along the long side, easily conforms to the wearer's waist. Furthermore, in the position further to the abdomen along the long side than the waistband joint 2, the lower groin area is softer than the portion overlapping the waistband joint 2 (where the elastic back waistband 25 is located), making it easier to conform to the wearer's body. Thus, the fit and comfort when worn are improved.

[0159] [other]

[0160] The above description of the embodiments is provided for ease of understanding of the present invention and is not intended to limit or interpret the present invention. Undoubtedly, the present invention can be modified and improved without departing from its spirit, and the present invention includes its equivalents.

[0161] Symbol Explanation

[0162] 1. Diapers (disposable diapers in underwear type, absorbent items).

[0163] 2. Waist joint (joint).

[0164] 10 Absorbent Subjects

[0165] 11 Absorbent core,

[0166] 11k recess,

[0167] 11t protrusion,

[0168] 12 top films,

[0169] 13 Back film,

[0170] 16 side panels,

[0171] 17. Elastic component cover plate,

[0172] 20 External components (external body).

[0173] 21. Ventral outer layer slice,

[0174] 22. Dorsal outer layer,

[0175] 23 Inner layer sheets,

[0176] 24 (Abdominal side) Waist elastic component

[0177] 25 (Back side) Elastic waistband components,

[0178] 26. Elastic components for the buttocks.

[0179] 27. Rear elastic component,

[0180] 31 Cover sheet,

[0181] 32 cover sheets,

[0182] 40. Elastic components in the crotch area.

[0183] 50 Leak-proof wall section,

[0184] 51 Leak-proof wall elastic component (long side elastic component).

[0185] 52. Leg circumference elastic components.

[0186] ER refers to the elastic area below the groin.

Claims

1. An absorbent article comprising a ventral waistband, a dorsal waistband, and an absorbent core, characterized in that, In both the unfolded and elongated states It has mutually orthogonal long side direction, left and right direction and thickness direction. A rear-side elastic member, extending at least along the left-right direction, is located further back than the center of the longitudinal direction. The dorsal elastic member is located on the ventral side in the long side direction. The absorbent article has a crotch elastic component positioned further away from the skin than the absorbent core, and extending and contracting at least along its long side. Viewed in the thickness direction, the elastic region in the groin area is defined by the telescopic portion of the elastic component, and this elastic region is positioned overlapping the absorbent core. The elastic area under the crotch is located further to the abdomen than the elastic component on the back. Compared to the length of the long side of the groin elastic region, the length of the long side from the dorsal end of the groin elastic region to the ventral end of the dorsal elastic component is longer.

2. The absorbent article according to claim 1, characterized in that, A deformation-inhibiting portion is provided further back than the groin elastic region and further ventrally than the dorsal elastic member. This deformation-inhibiting portion is used to inhibit the deformation of the absorbent core caused by the contraction of the groin elastic member. The deformation suppression portion has a portion along the left-right direction.

3. The absorbent article according to claim 2, characterized in that, A folding portion for folding the absorbent article is provided at the center of the long side. The dorsal end of the elastic area under the crotch is positioned further to the ventral side than the dorsal end of the folded portion.

4. The absorbent article according to claim 3, characterized in that, The deformation suppression part is the folded part.

5. The absorbent article according to claim 2, characterized in that, The deformation suppression section is a pressing section formed by pressing the absorbent core in the thickness direction.

6. The absorbent article according to claim 2, characterized in that, The deformation-suppressing portion is a low-weight portion of the absorbent core where the basis weight is lower than that of the surrounding area.

7. The absorbent article according to claim 2, characterized in that, In the left-right direction, the deformation-inhibiting portion has a portion that overlaps with the elastic region under the crotch.

8. The absorbent article according to claim 2, characterized in that, Compared to the lateral length of the elastic region under the crotch, the lateral length of the deformation suppression portion is longer.

9. The absorbent article according to claim 2, characterized in that, In the underwear-style configuration, the two ends of the abdominal waistband and the back waistband are joined at the joint. The absorbent article has a long-side elastic member that extends and retracts along the long side direction. The long-side elastic component is positioned further outward in the left-right direction than the groin elastic region, and is at least positioned further back than the groin elastic component. The absorbent article has a plurality of elastic members, including the back elastic member, located on the back side of the long side in the direction of the central part. Viewed in the thickness direction, the absorbent article has an overlapping portion of the absorbent core, the elastic member, and the long-side elastic member, wherein the elastic member is one of the plurality of elastic members disposed in the long-side direction at a position overlapping with the joint.

10. The absorbent article according to claim 1 or 2, characterized in that, The absorbent core has: The narrowest part is the narrowest in the left-right direction inside the long side direction; as well as The widest portion is located further back in the long side direction than the narrowest portion, and the width of the widest portion in the left-right direction is the widest point in the long side direction, further back than the center. The widest portion is provided on the back side, which is located in the long side direction, more so than the elastic area under the crotch.

11. The absorbent article according to claim 10, characterized in that, A deformation-inhibiting portion is provided further back than the groin elastic region and further ventrally than the dorsal elastic member. This deformation-inhibiting portion is used to inhibit the deformation of the absorbent core caused by the contraction of the groin elastic member. The deformation suppression portion has a portion along the left-right direction. The absorbent core has an inclined portion, located in the long side direction between the narrowest and widest portions, where the side ends of the absorbent core slope from the ventral side towards the dorsal side and from the inner side towards the outer side in the left-right direction. In the long side direction, at least a portion of the deformation suppression portion overlaps with the inclined portion.

12. The absorbent article according to claim 10, characterized in that, A deformation-inhibiting portion is provided further back than the groin elastic region and further ventrally than the dorsal elastic member. This deformation-inhibiting portion is used to inhibit the deformation of the absorbent core caused by the contraction of the groin elastic member. The deformation suppression portion has a portion along the left-right direction. In the long side direction, at least a portion of the deformation suppression portion overlaps with the narrowest portion.

13. The absorbent article according to claim 1 or 2, characterized in that, The absorbent core has its narrowest portion, which is the narrowest in the left-right direction, on the inner side of its long side. In the long side direction, the elastic region in the crotch has a portion that overlaps with the narrowest part.

14. The absorbent article according to claim 1 or 2, characterized in that, Viewed from the skin side, the absorbent core has the following shape: The narrowest part is the narrowest in the left-right direction inside the long side direction; as well as The widest portion is located further back in the long side direction than the narrowest portion, and the width of the widest portion in the left-right direction is the widest point in the long side direction, further back than the center. The absorbent core has an inclined portion, located in the long side direction between the narrowest and widest portions, where the side end of the absorbent core slopes from the ventral side towards the dorsal side and from the inner side towards the outer side in the left-right direction. In the long side direction, at least a portion of the inclined portion is positioned further back than the elastic area under the crotch.

15. The absorbent article according to claim 1 or 2, characterized in that, It has an absorbent body, which includes the absorbent core. It has an outer body, which includes the abdominal waist portion and the back waist portion. The absorbent substrate is fixed to the outer casing in the adhesive area. The area of ​​the adhesive region per unit area in the region of the absorbent body that partially overlaps with the area from the dorsal end of the groin elastic region to the ventral end of the dorsal elastic member in the long side direction is larger than the area of ​​the adhesive region per unit area in the region of the absorbent body that overlaps with the groin elastic region in the long side direction.

16. The absorbent article according to claim 1 or 2, characterized in that, In the underwear-style configuration, the two ends of the abdominal waistband and the back waistband are joined at the joint. The absorbent core has a plurality of elastic members, including the back elastic member, located on the back side of the long side in the direction of the center. Of the plurality of elastic components, in the long side direction, all elastic components located on the ventral side of the joint are discontinuous at the central portion in the left-right direction.

17. The absorbent article according to claim 16, characterized in that, Among the plurality of elastic members, in the long side direction, the elastic member located at the position overlapping the joint and located on the ventral side is discontinuous at the central part in the left-right direction.

18. The absorbent article according to claim 1 or 2, characterized in that, In the underwear-style configuration, the two ends of the abdominal waistband and the back waistband are joined at the joint. The absorbent core has a plurality of elastic members, including the back elastic member, located on the back side of the long side in the direction of the center. The maximum value of the interval between the elastic members that are adjacent to each other in the long side direction and are located at a position overlapping the joint in the long side direction is smaller than the maximum value of the interval between the elastic members that are adjacent to each other in the long side direction and are located on the ventral side of the long side direction than the joint.

19. The absorbent article according to claim 1 or 2, characterized in that, When viewed in the thickness direction, the average weight of the absorbent core in the region that partially overlaps with the area from the dorsal end of the groin elastic region to the ventral end of the dorsal elastic member is greater than the average weight of the absorbent core in the region that overlaps with the groin elastic region.

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