Underpants-type absorbent article and absorbent article

Abstract

The underpants-type absorbent article is provided with a pair of elastic members (16) along the longitudinal direction in an unfolded state and an extended state, and the pair of elastic members (16) are respectively arranged at the crotch part when the underpants-type absorbent article is worn and at both side end parts of the underpants-type absorbent article (1). When a position that is 1 / 2 of the distance from an end portion (40sc) on the center side in the longitudinal direction of the joining portion (20) of the back-side waist-encircling portion (40) to the center (CL) in the longitudinal direction of the underpants-type absorbent article (1) is defined as a reference position (RP), the reference position (RP) is the reference position (RP). The length of the absorbent core (11a) in the lateral direction at the reference position (RP) is greater than the length of the absorbent core (11a) in the lateral direction at the center (CL) of the underpants-type absorbent article (1) in the longitudinal direction, and the value obtained by dividing the length in the longitudinal direction from the reference position (RP) to the back-side end (11eb) of the absorbent core (11a) by the length in the longitudinal direction of the absorbent core (11a) is 30% or more.

Description

Technical Field

[0001] The present invention relates to a pant-type absorbent article and an absorbent article. Background Art

[0002] Conventionally, absorbent articles such as disposable diapers that absorb excrement such as feces and urine are known.

[0003] For example, a belt-type disposable diaper that suppresses urine leakage when worn is disclosed in Patent Document 1. As absorbent articles, generally speaking, in addition to belt-type disposable diapers such as Patent Document 1, underwear-type absorbent articles that improve ease of wearing or wearing feeling are also known.

[0004] For example, Patent Document 2 discloses a disposable diaper that includes three-dimensional gathers protruding toward the surface side or an absorber-lifting elastic member for lifting the absorber, thereby preventing side leakage of excrement during wear or sagging of the absorber during wear.

[0005] Prior Art Literature

[0006] Patent Literature

[0007] Patent Document 1: Japanese Patent Application Publication No. 2021-194473

[0008] Patent Document 2: Japanese Patent Application Publication No. 2001-178771 Summary of the invention

[0009] Problems to be solved by the invention

[0010] It is desirable to suppress leakage of excrement when wearing a pant-type absorbent article. In particular, it is desirable to suppress leakage of excrement to the outside of the pant-type absorbent article even when the wearer of the pant-type absorbent article is in a horizontal sleeping position.

[0011] The present invention has been made in view of the above-mentioned conventional problems, and a first object of the present invention is to provide a pull-on absorbent article which reduces the possibility of excrement leaking outward in the transverse direction of the pull-on absorbent article.

[0012] In addition, in the disposable diaper of Patent Document 1, when a large amount of excrement is discharged in a short time due to urination, the excrement may flow to the back side and leak. In particular, when the wearer sleeps in a horizontal position, the excrement may leak from the side of the back.

[0013] The present invention has been made in view of the above-mentioned conventional problems, and a second object of the present invention is to provide an absorbent article which reduces the possibility of excrement on the back side of the absorbent article leaking outward in the lateral direction.

[0014] Solutions to Solve Problems

[0015] The first invention for solving the first problem is a pant-type absorbent article, which has mutually intersecting longitudinal, transverse and thickness directions, and comprises a ventral waistline portion, a dorsal waistline portion and a liquid-absorbent absorbent core, and is formed into a pant-type by a joint portion that joins a pair of side ends of the ventral waistline portion and a pair of side ends of the dorsal waistline portion, and is characterized in that, in an unfolded state and an extended state, the pant-type absorbent article comprises a pair of elastic members along the longitudinal direction, and the pair of elastic members are respectively arranged in the crotch portion when worn and the pant At the two side ends of the underwear type absorbent article, when a position that is 1 / 2 of the distance from the end of the longitudinal center side of the above-mentioned joint in the above-mentioned dorsal waistline portion to the above-mentioned longitudinal center of the above-mentioned underwear type absorbent article is set as a reference position, the above-mentioned transverse length of the absorbent core at the above-mentioned reference position is greater than the above-mentioned transverse length of the absorbent core at the above-mentioned longitudinal center of the above-mentioned underwear type absorbent article, and the value obtained by dividing the above-mentioned longitudinal length from the above-mentioned reference position to the end of the dorsal side of the absorbent core by the above-mentioned longitudinal length of the absorbent core is greater than 30%.

[0016] Provided is a pant-type absorbent article having mutually intersecting longitudinal, transverse and thickness directions, the pant-type absorbent article having a ventral waistline portion, a dorsal waistline portion and a liquid-absorbent absorbent core, and becoming pant-type by utilizing a joint portion that joins a pair of side ends of the ventral waistline portion and a pair of side ends of the dorsal waistline portion, and characterized in that in an unfolded state and an extended state, the pant-type absorbent article has a pair of elastic members along the longitudinal direction, the pair of elastic members are respectively arranged in a crotch portion when worn and at both side ends of the pant-type absorbent article, the absorbent core has a wide portion at a position closer to the back side than the longitudinal center of the pant-type absorbent article, and a value obtained by dividing the longitudinal length of the wide portion by the longitudinal length of the absorbent core is greater than 30%.

[0017] In addition, a second invention for solving the second problem is an absorbent article having a longitudinal direction, a lateral direction, and a thickness direction intersecting each other, the absorbent article having a ventral waistline portion, a dorsal waistline portion, and a liquid-absorbent absorbent core, characterized in that in an unfolded state and an extended state, the absorbent article has a pair of elastic regions that can contract in the longitudinal direction, the pair of elastic regions being formed by an elastic member provided on the non-skin side relative to the absorbent core, at least a portion of the crotch portion of the pair of elastic regions when worn is located on the back side relative to the center in the longitudinal direction, and the pair of elastic regions are respectively provided at both side ends of the absorbent article, and with respect to the pair of elastic regions, when the portion of the pair of elastic regions on the ventral side relative to the center in the longitudinal direction is respectively defined as the ventral elastic region, and the portion of the pair of elastic regions on the back side relative to the center in the longitudinal direction is defined as the dorsal elastic region, a value obtained by dividing the weight of the absorbent core overlapping the dorsal elastic region in the thickness direction by the area of ​​the dorsal elastic region is greater than a value obtained by dividing the weight of the absorbent core overlapping the ventral elastic region in the thickness direction by the area of ​​the ventral elastic region.

[0018] Other features of the present invention will become apparent from the description of this specification and the accompanying drawings.

[0019] Effects of the Invention

[0020] According to the first invention, the possibility of excrement leaking outward in the transverse direction of the pull-on absorbent article can be reduced.

[0021] According to the second invention, the possibility of excrement leaking outward laterally from the back side of the absorbent article can be reduced. BRIEF DESCRIPTION OF THE DRAWINGS

[0022] Figure 1 It is a schematic perspective view of the diaper 1.

[0023] Figure 2 This is a plan view of the diaper 1 in the unfolded and stretched state as viewed from the skin side.

[0024] Figure 3 yes Figure 2 A schematic cross-sectional view taken along the A-A line.

[0025] Figure 4 It is a top view of the absorbent body 10.

[0026] Figure 5A yes Figure 4 A schematic cross-sectional view as viewed in the X-X direction. Figure 5B yes Figure 4 A schematic cross-sectional view in the Y-Y direction. Figure 5C yes Figure 4 A schematic cross-sectional view in the Z-Z direction.

[0027] Figure 6 It is a figure which shows typically the shape of the absorbent core 11a when worn.

[0028] Figure 7 It is a figure which illustrates schematically the force applied to the absorbent core 11a in the wearing state.

[0029] Figure 8A to Figure 8C This is a diagram for explaining deformation of the absorbent body 10 .

[0030] Fig.9A It is a figure explaining the accumulation state of excrement in the normal wearing state. Fig. 9B It is a figure explaining the accumulation state of excrement in the wearing state of inclination.

[0031] Fig.10 It is a schematic perspective view of the diaper 1.

[0032] Fig.11 This is a plan view of the diaper 1 in the unfolded and stretched state as viewed from the skin side.

[0033] Fig.12 yes Fig.11 A schematic cross-sectional view taken along the A-A line.

[0034] Fig.13 It is a top view of the absorbent body 10.

[0035] Fig.14A yes Fig.13 A schematic cross-sectional view as viewed in the X-X direction. Fig. 14B yes Fig.13 A schematic cross-sectional view in the Y-Y direction. Fig. 14C yes Fig.13 A schematic cross-sectional view in the Z-Z direction.

[0036] Fig.15 It is a figure which shows typically the shape of the absorbent core 11a when worn.

[0037] Fig.16 This is a diagram for explaining the ventral elastic region 60A and the dorsal elastic region 60B.

[0038] Fig.17 yes Fig.16 Magnified view of portion K in FIG.

[0039] Fig.18 It is a figure which illustrates schematically the force applied to the absorbent core 11a in the wearing state.

[0040] Figures 19A to 19C This is a diagram for explaining deformation of the absorbent body 10 .

[0041] Fig. 20A It is a figure explaining the accumulation state of excrement in the normal wearing state. Fig. 20B It is a figure explaining the accumulation state of excrement in the wearing state of inclination. DETAILED DESCRIPTION

[0042] At least the following matters will be apparent from the description of this specification and the accompanying drawings.

[0043] Mode 1 is a panty-type absorbent article, which has longitudinal, transverse and thickness directions that intersect each other, and the panty-type absorbent article has a ventral waistline portion, a dorsal waistline portion and a liquid-absorbent absorbent core, and is formed into a panty shape by joining a pair of side ends of the ventral waistline portion and a pair of side ends of the dorsal waistline portion, and is characterized in that in an unfolded state and an extended state, the panty-type absorbent article has a pair of elastic members along the longitudinal direction, the pair of elastic members are respectively arranged in the crotch portion when worn, and the panty-type absorbent article At the two side ends, when a position that is 1 / 2 of the distance from the end of the longitudinal center side of the above-mentioned joint in the above-mentioned dorsal waistline portion to the above-mentioned longitudinal center of the above-mentioned underwear type absorbent article is set as a reference position, the above-mentioned transverse length of the absorbent core at the above-mentioned reference position is greater than the above-mentioned transverse length of the absorbent core at the above-mentioned longitudinal center of the above-mentioned underwear type absorbent article, and the value obtained by dividing the above-mentioned longitudinal length from the above-mentioned reference position to the end of the dorsal side of the above-mentioned absorbent core by the above-mentioned longitudinal length of the above-mentioned absorbent core is greater than 30%.

[0044] The reference position of the panty-type absorbent article in the unfolded and stretched state is the portion that the wearer's legs abut against when the panty-type absorbent article is worn, and is likely to apply force laterally inward. In particular, the portion of the wearer's legs abutting against the reference position includes not only the wearer's legs but also a portion bulging toward the buttocks, so the wearer's legs (including the buttocks) are thicker than the portion closer to the ventral side than the reference position, and are likely to apply a greater force laterally inward to the panty-type absorbent article. According to mode 1, compared with the case where the transverse length of the absorbent core at the reference position is less than the transverse length of the absorbent core at the center of the longitudinal direction and the value obtained by dividing the longitudinal length from the reference position to the end of the back side of the absorbent core by the longitudinal length of the absorbent core is less than 30%, when wearing the underwear type absorbent article, the two ends of the absorbent core in the longitudinal direction are pulled toward the skin side by the contraction of a pair of elastic members, and the absorbent core at the reference position is narrowed toward the transverse inner side by the force toward the transverse inner side generated by the wearer's legs, and it is easy to form a shape in which the transverse central part protrudes toward the non-skin side and the transverse side end of the absorbent core bulges toward the skin side. Thus, a portion that is recessed toward the non-skin side can be set in the longitudinal central part and the transverse central part of the absorbent core. In addition, it is easy to set the recessed portion in the area on the back side of the absorbent core. Among the recessed portions, the portion that is raised toward the skin side at the transverse side end of the absorbent core blocks the excrement from being discharged toward the transverse outer side, and it is easy to accumulate excrement. In particular, even if the wearer is in a lying position, the excrement can be retained in the recessed portion between the two lateral ends of the absorbent core, and the excrement can be easily blocked by the side ends of the absorbent core, thereby reducing the possibility of excrement leaking to the lateral outside of the underwear-type absorbent article.

[0045] Mode 2 is an underpants-type absorbent article as described in Mode 1, characterized in that the area of ​​the absorbent core located on the back side compared to the center of the longitudinal direction of the underpants-type absorbent article is larger than the area of ​​the absorbent core located on the ventral side compared to the center of the longitudinal direction of the underpants-type absorbent article.

[0046] According to the second aspect, when the area of ​​the absorbent core located at the back side of the longitudinal center of the underpants-type absorbent article is smaller than the area of ​​the absorbent core located at the ventral side of the longitudinal center of the underpants-type absorbent article, it is easy to form the concave portion provided in the absorbent core in a wide range of the absorbent core, thereby reducing the possibility of excrement leaking from the side end of the back side of the absorbent article. Since excrement is easily accumulated in the concave portion on the back side, it is easy to reduce the possibility of excrement leaking from the side end of the back side of the absorbent article, especially in the state of the sleeping posture.

[0047] Mode 3 is a panty-type absorbent article as described in Mode 1 or 2, characterized in that the above-mentioned dorsal waist portion has a dorsal waist elastic component along the above-mentioned transverse direction, the above-mentioned absorbent core is arranged on the skin side compared to the above-mentioned dorsal waist portion, and when viewed in the above-mentioned thickness direction, there is a portion where the above-mentioned absorbent core and the above-mentioned dorsal waist elastic component overlap at a position closer to the above-mentioned dorsal side than the above-mentioned reference position in the above-mentioned longitudinal direction.

[0048] According to method 3, when viewed in the thickness direction, the contraction of the back waist elastic component overlapping the absorbent core makes it easy for the absorbent core to come into contact with the wearer's skin, thereby reducing the possibility of the absorbent core detaching from the wearer's skin or sagging downward.

[0049] Mode 4 is a panty-type absorbent article as described in any one of Modes 1 to 3, characterized in that the above-mentioned dorsal waistline portion has a dorsal elastic component, and the above-mentioned dorsal elastic component has: a pair of inclined elastic portions, the pair of inclined elastic portions are located at the two side ends in the above-mentioned transverse direction and are closer to the central side of the above-mentioned longitudinal direction than the above-mentioned joining portion, and are inclined from the inner side to the outer side in the above-mentioned transverse direction and from the central side of the above-mentioned longitudinal direction toward the above-mentioned dorsal side respectively; and a crotch side elastic portion, the crotch side elastic portion is along the above-mentioned transverse direction, the above-mentioned crotch side elastic portion is arranged on the above-mentioned ventral side compared with the above-mentioned joining portion of the above-mentioned dorsal waistline portion in the above-mentioned longitudinal direction, and in the above-mentioned longitudinal direction, at least a part of the above-mentioned crotch side elastic portion is located on the ventral side compared with the above-mentioned dorsal end of the above-mentioned absorbent core.

[0050] According to method 4, since the absorbent core can be easily contracted toward the inner side in the lateral direction by the contraction of the elastic part on the crotch side, it is easy to form a shape in which the lateral central part of the absorbent core protrudes toward the non-skin side and the lateral side end parts of the absorbent core bulge toward the skin side when worn.

[0051] Mode 5 is a panty-type absorbent article as described in any one of Modes 1 to 4, characterized in that the above-mentioned dorsal waistline portion has a dorsal elastic component, and the above-mentioned dorsal elastic component has: a pair of inclined elastic portions, the pair of inclined elastic portions are located at the two side ends in the above-mentioned transverse direction and are closer to the central side of the above-mentioned longitudinal direction than the above-mentioned joining portion, and are inclined from the inner side to the outer side in the above-mentioned transverse direction and from the central side of the above-mentioned longitudinal direction toward the above-mentioned dorsal side respectively; and a crotch side elastic portion, the crotch side elastic portion is along the above-mentioned transverse direction, and the above-mentioned crotch side elastic portion is arranged on the above-mentioned ventral side compared to the above-mentioned joining portion of the above-mentioned dorsal waistline portion in the above-mentioned longitudinal direction. With respect to the above-mentioned longitudinal direction, the above-mentioned transverse length of the above-mentioned absorbent core at the end of the above-mentioned longitudinal central side of the above-mentioned crotch side elastic portion is greater than the above-mentioned transverse length of the above-mentioned absorbent core at the above-mentioned longitudinal center of the above-mentioned panty-type absorbent article, and is less than the above-mentioned transverse length of the above-mentioned absorbent core at the above-mentioned reference position.

[0052] According to method 5, since the wearability at the crotch portion is improved and the absorbent core can be easily contracted laterally inward by the contraction of the elastic portion on the crotch side, it is easy to form a shape in which the transverse central portion of the absorbent core protrudes toward the non-skin side and the transverse side ends of the absorbent core bulge toward the skin side when worn.

[0053] Mode 6 is a panty-type absorbent article as described in any one of Modes 1 to 5, characterized in that the dorsal waistline portion has a pair of inclined elastic portions at both side ends in the transverse direction and closer to the central side of the longitudinal direction than the joining portion, and the pair of inclined elastic portions are inclined from the inner side to the outer side in the transverse direction and from the central side of the longitudinal direction toward the dorsal side, respectively, and in the longitudinal direction, at least a portion of the inclined elastic portion is arranged on the dorsal side compared to the reference position.

[0054] According to method 6, by tilting the elastic portion at a position closer to the back side than the reference position, it is easy to apply a force toward the lateral inner side and the longitudinal back side (the upper side in the worn state) relative to the absorbent core. Therefore, in the worn state, a shape can be formed in which the lateral side end portion of the absorbent core at the back side than the reference position of the absorbent core bulges toward the skin side, and the lateral central portion can be easily protruded toward the non-skin side.

[0055] Mode 7 is a panty-type absorbent article as described in any one of Modes 1 to 6, characterized in that the absorbent core has a pair of deformation inducing parts, and the pair of deformation inducing parts are inclined from the ventral side in the longitudinal direction toward the dorsal side and from the inner side in the lateral direction toward the outer side.

[0056] According to aspect 7, the absorbent core can be easily deformed with the deformation inducing portion as a starting point.

[0057] Aspect 8 is the pull-on absorbent article according to aspect 7, wherein the ends of the pair of deformation guiding portions on the ventral side are separated from each other.

[0058] According to aspect 8, since the ends on the ventral side of the pair of deformation inducing parts are separated from each other, the force applied to the absorbent core is relieved at the separated portions, and the absorbent core is easily deformed by the induction of the deformation inducing parts.

[0059] Aspect 9 is the pull-on absorbent article according to aspect 7 or 8, wherein the end portion of the deformation guiding portion on the abdominal side is located on the abdominal side relative to the reference position.

[0060] According to method 9, the deformation inducing portion can easily induce deformation of the portion of the absorbent core located at the ventral side relative to the reference position. Therefore, through the deformation induction achieved by the inclined deformation inducing portion, the lateral central portion of the absorbent core can easily protrude toward the non-skin side, making it easy to leave excrement in the lateral central portion of the absorbent core.

[0061] Mode 10 is a panty-type absorbent article as described in any one of Modes 7 to 9, characterized in that the panty-type absorbent article has an absorbent body having the absorbent core, the absorbent body has leak-proof wall portions at both ends in the transverse direction, the leak-proof wall portions have leak-proof wall elastic components along the longitudinal direction, and in the transverse direction, the pair of deformation inducing portions are arranged on the inner side compared to the leak-proof wall portions.

[0062] According to method 10, the deformation inducing portion can easily cause the laterally central portion of the absorbent core to protrude toward the non-skin side, making it easy for excrement to remain in the laterally central portion of the absorbent core, and the possibility of excrement leaking from the laterally outer side can be reduced by the leak-proof wall portion provided on the laterally outer side.

[0063] Mode 11 is an underpants-type absorbent article as described in any one of Modes 7 to 10, characterized in that the above-mentioned dorsal waistline portion has a dorsal elastic component, and the above-mentioned dorsal elastic component has: a pair of inclined elastic portions, the pair of inclined elastic portions are located at the two side ends in the above-mentioned transverse direction and are located closer to the central side of the above-mentioned longitudinal direction than the above-mentioned joining portion, and are inclined from the inner side to the outer side in the above-mentioned transverse direction and from the central side of the above-mentioned longitudinal direction toward the above-mentioned dorsal side respectively; and a crotch side elastic portion, the crotch side elastic portion is along the above-mentioned transverse direction, the above-mentioned crotch side elastic portion is arranged on the above-mentioned ventral side than the above-mentioned joining portion of the above-mentioned dorsal waistline portion in the above-mentioned longitudinal direction, and in the above-mentioned longitudinal direction, at least a part of the above-mentioned crotch side elastic portion is located on the above-mentioned ventral side than the above-mentioned dorsal end of the above-mentioned pair of deformation inducing portions.

[0064] According to method 11, by inducing the deformation of the absorbent core by a pair of deformation inducing parts and applying force to the absorbent core laterally inward by the elastic part on the crotch side, the laterally central part of the absorbent core can be easily protruded toward the non-skin side, making it easy to retain excrement in the laterally central part of the absorbent core.

[0065] Method 12 is a panty-type absorbent article having mutually intersecting longitudinal, lateral and thickness directions, the panty-type absorbent article having a ventral waist portion, a dorsal waist portion and a liquid-absorbent absorbent core, and becoming panty-type by utilizing a joint portion that joins a pair of side ends of the ventral waist portion and a pair of side ends of the dorsal waist portion, and is characterized in that, in an unfolded state and an extended state, the panty-type absorbent article has a pair of elastic members along the longitudinal direction, the pair of elastic members are respectively arranged in the crotch portion when worn and at both side ends of the panty-type absorbent article, the absorbent core has a wide portion at a position closer to the back side than the longitudinal center of the panty-type absorbent article, and a value obtained by dividing the longitudinal length of the wide portion by the longitudinal length of the absorbent core is greater than 30%.

[0066] Since the width of the wide portion of the absorbent core is long at the center of the longitudinal direction of the panty-type absorbent article, the force of the wearer's legs when the panty-type absorbent article is worn is more likely to be applied to the wide portion than at the center of the longitudinal direction of the panty-type absorbent article. Therefore, according to mode 12, when the panty-type absorbent article is worn, the two ends of the absorbent core in the longitudinal direction are pulled toward the skin side by the contraction of a pair of elastic members, and the wide portion of the absorbent core is narrowed toward the inside of the transverse direction by the force generated by the wearer's legs toward the inside of the transverse direction, and it is easy to form a shape in which the center of the transverse direction protrudes toward the non-skin side and the side ends of the absorbent core in the transverse direction bulge toward the skin side. Thus, a portion that is recessed toward the non-skin side can be provided in the center of the longitudinal direction and the center of the transverse direction of the absorbent core. In addition, it is easy to arrange the concave portion in the area on the back side of the absorbent core. Among the concave portions, the portions protruding toward the skin side arranged at the lateral side ends of the absorbent core block the excrement from leaking outward in the lateral direction, and it is easy to store the excrement. In particular, even if the wearer is lying down, the excrement can be retained in the concave portions between the lateral side ends of the absorbent core, and the excrement can be easily blocked by the lateral ends of the absorbent core, thereby reducing the possibility of excrement leaking outward in the lateral direction of the underwear-type absorbent article.

[0067] Mode 13 is a panty-type absorbent article as described in Mode 12, characterized in that the absorbent core has a ventral wide portion at a position closer to the ventral side than the center in the longitudinal direction, and the longitudinal length of the wide portion is greater than twice the longitudinal length of the ventral wide portion.

[0068] According to mode 13, compared with the case where the longitudinal length of the wide width portion on the back side is less than 2 times the longitudinal length of the wide width portion on the ventral side, the deformation of the ventral part of the absorbent core during wearing is reduced, and the force generated by the wearer's legs toward the lateral inner side is easily applied to the wide width portion on the back side, so that the lateral central part protrudes toward the non-skin side, and the lateral side end of the absorbent core is easily formed into a shape in which the lateral side end of the absorbent core bulges toward the skin side. As a result, the ventral part of the absorbent core with less deformation maintains the shape of the absorbent core along the body, and it is easy to absorb excrement such as urine, and the dorsal part of the absorbent core is recessed toward the non-skin side of the lateral central part of the absorbent core to easily accumulate excrement, and bulges toward the skin side provided at the lateral side end of the absorbent core, which can easily prevent excrement from leaking toward the lateral outer side of the excrement.

[0069] Mode 14 is an absorbent article having mutually intersecting longitudinal, transverse and thickness directions, the absorbent article having a ventral waistline portion, a dorsal waistline portion and a liquid-absorbent absorbent core, characterized in that, in an unfolded and stretched state, the absorbent article has a pair of elastic regions that can contract in the longitudinal direction, the pair of elastic regions being formed by an elastic member disposed on the non-skin side relative to the absorbent core, at least a portion of the crotch portion of the pair of elastic regions when worn is located on the back side relative to the center in the longitudinal direction, and the pair of elastic regions are respectively disposed at both side ends of the absorbent article, and with respect to the pair of elastic regions, when the portion of the pair of elastic regions that is closer to the ventral side than the center in the longitudinal direction is respectively set as the ventral elastic region, and the portion of the pair of elastic regions that is closer to the back side than the center in the longitudinal direction is set as the dorsal elastic region, a value obtained by dividing the weight of the absorbent core that overlaps with the dorsal elastic region in the thickness direction by the area of ​​the dorsal elastic region is greater than a value obtained by dividing the weight of the absorbent core that overlaps with the ventral elastic region in the thickness direction by the area of ​​the ventral elastic region.

[0070] According to mode 14, compared with the case where the value obtained by dividing the weight of the absorbent core overlapping the back elastic region in the thickness direction by the area of ​​the back elastic region is smaller than the value obtained by dividing the weight of the absorbent core overlapping the ventral elastic region in the thickness direction by the area of ​​the ventral elastic region, in the wearing state, the contraction force of the elastic region makes it easy for the two side ends of the absorbent core to bulge toward the skin side with respect to the lower crotch portion of the absorbent core and the portion closer to the back side than the center in the longitudinal direction, and it is easy to form a recessed portion that makes the lateral central portion of the absorbent article recessed toward the non-skin side. Through the recessed portion, it is easy to retain excrement, or it is possible to prevent excrement from leaking outwardly in the lateral direction of the absorbent article. In particular, even when the wearer is in a horizontal sleeping posture, it is easy to retain excrement in the recessed portion protruding toward the non-skin side of the absorbent article, and the side ends of the absorbent article block the excrement, thereby reducing the possibility of excrement leaking outwardly in the lateral direction of the absorbent article.

[0071] A fifteenth aspect is the absorbent article according to the fourteenth aspect, wherein a length of the elastic region in the transverse direction is greater than a length of the elastic member in the thickness direction.

[0072] According to aspect 15, the possibility that the absorbent core is locally contracted by the elastic member can be reduced, and deformation of the absorbent core can be easily promoted.

[0073] Mode 16 is an absorbent article as described in Mode 15, characterized in that the force causing the outer end portions of each of the pair of elastic regions in the lateral direction to be stretched per unit length in the longitudinal direction is greater than the force causing the inner end portions of each of the pair of elastic regions in the lateral direction to be stretched per unit length in the longitudinal direction.

[0074] According to aspect 16, the outer portion in the transverse direction of the absorbent core is raised further toward the skin side, and the inner portion in the transverse direction is recessed toward the non-skin side, so that the recessed portion is easily formed in the absorbent core.

[0075] Aspect 17 is the absorbent article according to any one of aspects 14 to 16, wherein the pair of elastic regions are provided across the center of the absorbent article in the longitudinal direction.

[0076] According to mode 17, the elastic region portion of the pair of elastic regions located at the ventral side of the center in the longitudinal direction of the absorbent article shrinks in the longitudinal direction, and the central portion in the longitudinal direction of the absorbent article shrinks in the longitudinal direction. Moreover, the elastic region portion located at the back side of the center in the longitudinal direction of the absorbent article shrinks, and the two side portions of the absorbent core located at the back side of the center in the longitudinal direction of the absorbent article bulge toward the skin side, and the concave portion that makes the lateral central portion of the absorbent core protrude toward the non-skin side is easily formed. Therefore, the possibility of excrement leaking from the lateral outer side of the absorbent article can be reduced.

[0077] Mode 18 is an absorbent article as described in any one of Modes 14 to 17, characterized in that the absorbent article is an underpants-type absorbent article formed by joining a pair of side ends of the ventral waist portion and a pair of side ends of the dorsal waist portion using a joining portion, and the pair of elastic regions are respectively arranged at a position closer to the dorsal side than the joining portion of the ventral waist portion and closer to the ventral side than the joining portion of the dorsal waist portion.

[0078] According to aspect 18, the contraction of the elastic region facilitates the deformation of the absorbent core located in the crotch portion when worn.

[0079] Mode 19 is an absorbent article as described in any one of Modes 14 to 18, characterized in that the above-mentioned ventral waistline portion has a ventral elastic component that can be stretched in the above-mentioned lateral direction, and the above-mentioned dorsal waistline portion has a dorsal elastic component that can be stretched in the above-mentioned lateral direction, and in the above-mentioned longitudinal direction, the above-mentioned pair of elastic areas are respectively arranged at a position closer to the dorsal side than the above-mentioned ventral elastic component closest to the dorsal side and closer to the ventral side than the above-mentioned dorsal elastic component closest to the ventral side.

[0080] According to aspect 19, the contraction of the elastic region facilitates the deformation of the absorbent core located in the crotch portion when worn.

[0081] Mode 20 is an absorbent article as described in any one of Modes 14 to 19, characterized in that the above-mentioned ventral waistline portion has a ventral elastic component that can be stretched in the above-mentioned lateral direction, and the above-mentioned dorsal waistline portion has a dorsal elastic component that can be stretched in the above-mentioned lateral direction, and the above-mentioned longitudinal distance from the above-mentioned dorsal end of each of the above-mentioned pair of elastic regions to the above-mentioned ventral end of the above-mentioned dorsal elastic component closest to the above-mentioned ventral side is smaller than the above-mentioned longitudinal distance from the above-mentioned ventral end of each of the above-mentioned pair of elastic regions to the above-mentioned dorsal end of the above-mentioned ventral elastic component closest to the above-mentioned dorsal side.

[0082] According to the embodiment 20, compared with the case where the longitudinal distance from the end of each of the pair of elastic regions on the back side to the end of the ventral side of the most ventral dorsal elastic member is greater than the longitudinal distance from the end of each of the pair of elastic regions on the ventral side to the end of the dorsal side of the most dorsal ventral elastic member, the dorsal part of the absorbent core is easily pulled up by the dorsal elastic member so as to contact the skin of the wearer. Therefore, even if the wearer is in a horizontal position, the possibility of excrement leaking from the longitudinal dorsal end of the absorbent article can be reduced.

[0083] Mode 21 is an absorbent article as described in any one of Modes 14 to 20, characterized in that the absorbent article has an absorbent body having the absorbent core, and the absorbent body has a pair of leak-proof wall portions at both ends in the transverse direction, and the pair of leak-proof wall portions have leak-proof wall elastic components along the longitudinal direction, so that the force of each unit length of the pair of elastic regions stretched in the longitudinal direction is smaller than the force of each unit length of the pair of leak-proof wall portions stretched in the longitudinal direction.

[0084] According to aspect 21, the possibility that the absorbent core excessively deformed beyond the leakage preventing wall portion and excessively abuts against the skin can be reduced by contraction of the elastic region.

[0085] Mode 22 is an absorbent article as described in any one of modes 14 to 21, characterized in that, in the above-mentioned transverse direction, the shortest distance from the narrowest part of the above-mentioned absorbent core where the length in the transverse direction is the shortest to the center of each of the above-mentioned pair of elastic regions in the above-mentioned transverse direction is smaller than the shortest distance from the widest part of the above-mentioned absorbent core where the length in the transverse direction is the longest on the back side relative to the center in the above-mentioned longitudinal direction of the above-mentioned absorbent article to the center of each of the above-mentioned pair of elastic regions in the above-mentioned transverse direction.

[0086] According to aspect 22, it is easy to make the lateral side of the absorbent core protrude higher toward the skin side, and thus it is easy to reduce the possibility of excrement leaking from the lateral outer side of the absorbent article.

[0087] Mode 23 is an absorbent article as described in any one of Modes 14 to 22, characterized in that, when viewed in the thickness direction, the elastic region on the transverse side has an overlapping portion overlapping the absorbent core, and the area of ​​the overlapping portion on the transverse side is more than half of the area of ​​the elastic region on the transverse side.

[0088] According to aspect 23, the overlapping portion can be directly deformed by contraction of the elastic region so that both side portions of the absorbent core swell toward the skin side and the lateral center portion of the absorbent core protrudes toward the non-skin side.

[0089] Mode 24 is an absorbent article as described in any one of Modes 14 to 23, characterized in that, when viewed in the thickness direction, the elastic region on the transverse side has a non-overlapping portion that does not overlap with the absorbent core, and the area of ​​the non-overlapping portion on the transverse side is more than half of the area of ​​the elastic region on the transverse side.

[0090] According to method 24, since the absorbent core is a portion with higher rigidity, in the non-overlapping portion with lower rigidity, the two sides of the crotch portion are first bulged toward the skin side through the contraction of the elastic region, which in conjunction with this can promote the deformation of the absorbent core adjacent to the non-overlapping portion.

[0091] Mode 25 is an absorbent article as described in any one of Modes 14 to 24, characterized in that, in the longitudinal direction, the area of ​​the absorbent core located on the back side relative to the center of the pair of elastic regions is larger than the area of ​​the absorbent core located on the ventral side relative to the center of the pair of elastic regions.

[0092] According to method 25, when the absorbent core is deformed due to the contraction of the elastic region, compared with the case where the area of ​​the absorbent core located at the back side of the center of the elastic region is smaller than the area of ​​the absorbent core located at the ventral side of the center of the elastic region, a larger area can be provided on the back side so that the two side portions of the absorbent core are bulged toward the skin side and the lateral center portion of the absorbent core protrudes toward the non-skin side, thereby absorbing more excreta, thereby reducing the possibility of excreta leakage from the absorbent article.

[0093] Mode 26 is an absorbent article as described in any one of modes 14 to 25, characterized in that the absorbent article is a pant-type absorbent article that becomes an underpants type by joining a pair of side ends of the ventral waistline portion and a pair of side ends of the dorsal waistline portion using a joining portion, and the dorsal waistline portion has a dorsal elastic component, and the dorsal elastic component has: a pair of inclined elastic portions, the pair of inclined elastic portions are located at the two side ends in the above-mentioned transverse direction and are closer to the center side of the above-mentioned longitudinal direction than the above-mentioned joining portion, and are inclined from the inside to the outside in the above-mentioned transverse direction and from the center side of the above-mentioned longitudinal direction toward the above-mentioned dorsal side; and a crotch side elastic portion, the crotch side elastic portion is along the above-mentioned transverse direction, the crotch side elastic portion is arranged on the above-mentioned ventral side in the above-mentioned longitudinal direction compared to the above-mentioned joining portion of the dorsal waistline portion, and when viewed in the above-mentioned thickness direction, at least a portion of the crotch side elastic portion is located on the above-mentioned ventral side compared to the center of each of the above-mentioned pair of elastic regions in the above-mentioned longitudinal direction, and has a portion overlapping with the above-mentioned absorbent core.

[0094] According to method 26, since the elastic portion on the crotch side can be brought close to the wearer's urination opening when worn, a recessed portion is formed in the crotch portion when worn, in which both side portions of the absorbent core are raised toward the skin side and the lateral center portion of the absorbent core is protruded toward the non-skin side. Furthermore, the elastic portion on the crotch side makes it easy for the absorbent core to come into close contact with the wearer's skin near the urination opening, thereby easily absorbing urine.

[0095] ===First Embodiment===

[0096] As the underwear type absorbent article involved in the present invention, an underwear type disposable diaper 1 for adults (hereinafter also referred to as "diaper 1") can be exemplified. However, the underwear type absorbent article involved in the present invention also includes a shorts type sanitary napkin. In addition, the wearer of the underwear type absorbent article is not limited to adults, but may also be a living being such as an infant or an animal.

[0097] <Structure of Diaper 1>

[0098] Figure 1 It is a schematic perspective view of the diaper 1. Figure 2 This is a plan view of the diaper 1 in the unfolded and stretched state as viewed from the skin side. Figure 3 yes Figure 2 A schematic cross-sectional view taken along the A-A line of the diaper 1. In addition, the "expanded state" refers to the following state: the side joints 20 of the side portions of the panty-type diaper 1, which are the joints of the side portions (side ends) 30sw of the ventral waistline portion 30 and the side portions (side ends) 40sw of the dorsal waistline portion 40, are separated and opened, respectively, and the diaper 1 is unfolded as a whole into a plane. The "stretched state" refers to the following state: the elastic components of the diaper 1 are stretched to the extent that the wrinkles of the diaper 1 cannot be visually recognized. Specifically, it refers to the state in which the dimensions of the components constituting the diaper 1 (such as the ventral waistline portion 30 described later, etc.) are stretched to the same size or a size close to the dimensions of the components alone. Figure 2 The CC line in the diagram is the center line in the horizontal direction (also called the "lateral center CC"), and the CL line is the center line in the vertical direction (also called the "longitudinal center CL").

[0099] The diaper 1 in a pant-type state has mutually intersecting up-down directions, lateral directions, and front-to-back directions, and has a waist opening BH and a pair of leg openings LH, LH. The upper side in the up-down direction corresponds to the waist opening BH side, and the lower side corresponds to the crotch side. The front side in the front-to-back direction corresponds to the ventral side of the wearer, and the back side corresponds to the back side of the wearer. The lateral direction is the direction along the expansion and contraction direction of the ventral waist elastic components 35, 45 of the ventral waist portion 30 and the dorsal waist portion 40. The longitudinal direction of the diaper 1 in the unfolded and stretched state is equivalent to the length direction of the absorbent body 10, and is the direction along the up-down direction of the diaper 1 in the pant-type state. In addition, as Figure 3 As shown in FIG. 1 and FIG. 2 , the direction in which the materials constituting the diaper 1 are stacked is referred to as the thickness direction. The side in contact with the wearer's skin in the thickness direction is referred to as the skin side, and the opposite side is referred to as the non-skin side.

[0100] The diaper 1 is a so-called three-component type pant-type diaper having a liquid-absorbent main body 10, an abdominal waistline portion 30 covering the abdominal part of the wearer, and a back waistline portion 40 covering the back part of the wearer.

[0101] like Figure 2As shown in the figure, in the unfolded and stretched state, the ventral waistline 30 and the dorsal waistline 40 are arranged parallel to each other with a gap in the longitudinal direction, and the absorbent body 10 is laid between them, and the ends 10ea and 10eb in the longitudinal direction of the absorbent body 10 are respectively joined and fixed to the skin side of the waistline 30 and 40 closest to each other, and the appearance shape presents a roughly H shape when viewed from above. And, from this state, the absorbent body 10 is folded in half with the central position (central line) CL in the longitudinal direction as the folding position. That is, the lower end of the diaper 1 in the underpants-type state in the vertical direction corresponds to the center CL of the diaper 1 in the unfolded and stretched state. In this folded state, the ventral waistline 30 and the dorsal waistline 40 facing each other are joined and connected to each other at the side portions 30sw and the side portions 40sw on both sides in the lateral direction to form a pair of side joints 20, 20. That is, the ventral waistline portion 30 and the dorsal waistline portion 40 are formed into a ring shape by a pair of side joint portions 20, 20. Figure 1 The diaper 1 is in a pull-on type with a waist opening BH and a pair of leg openings LH, LH as shown. The side joints 20 are formed by known joining means such as welding or bonding.

[0102] (Abdominal waist circumference 30)

[0103] The ventral waistline portion 30 is disposed on the non-skin side of the absorbent body 10. Figure 3 As shown in the figure, the ventral waist circumference portion 30 has: a skin side sheet 31 disposed at the position closest to the skin side in the thickness direction; a non-skin side sheet 32 ​​stacked in a manner adjacent to the non-skin side of the skin side sheet 31; and a ventral waist elastic member 35 provided between the skin side sheet 31 and the non-skin side sheet 32. The ventral waist circumference portion 30 is basically a two-layer structure of the skin side sheet 31 and the non-skin side sheet 32, but may also have a structure of more than three layers, such as a skin top sheet 36 (described later).

[0104] The skin side sheet 31 is a rectangular sheet member when viewed from above, and is formed of, for example, SMS nonwoven fabric. The non-skin side sheet 32 ​​is a rectangular sheet member formed of nonwoven fabric when viewed from above, and is formed of, for example, SMS nonwoven fabric. The skin side sheet 31 and the non-skin side sheet 32 ​​can be of any size and shape. In addition, the upper end or lower end of the non-skin side sheet 32 ​​can also be provided with a folded portion folded back from the non-skin side toward the skin side and from the front side toward the rear side in the longitudinal direction.

[0105] The ventral waist elastic member 35 is a ventral elastic member along the transverse direction, and is a stretchable member that can be stretched in the transverse direction. In this embodiment, a plurality of rubber threads are used. A plurality of ventral waist elastic members 35 are arranged in a row in the up-down direction (longitudinal direction) between the skin side sheet 31 and the non-skin side sheet 32, and are installed in a transversely stretched state using adhesives such as hot melt adhesives. Through the stretchability exhibited by the ventral waist elastic member 35, the ventral waist portion 30 matches the ventral waist of the wearer. In addition, the diaper 1 of this embodiment uses rubber threads as the ventral waist elastic member 35 in the ventral waist portion 30, but a stretchable member such as a stretch sheet can also be configured to make the ventral waist portion 30 stretch in the transverse direction.

[0106] In addition, the ventral waistline portion 30 has a skin surface sheet 36. The skin surface sheet 36 is as shown in FIG. Figure 3 As shown, the sheet member is configured in a manner of covering the upper end of the absorbent body 10 from the skin side, and has a function as a cover sheet. Thus, when the diaper 1 is worn, the following situations can be suppressed: the absorbent body 10 is separated from the abdominal waistline 30, or the superabsorbent polymer (SAP) or excrement forming the absorbent core 11a in the absorbent body 10 leaks from the upper end of the absorbent body 10, or the upper end of the absorbent body 10 is pressed into the skin of the wearer. The skin sheet 36 is formed of, for example, SMS nonwoven fabric. In addition, the skin sheet 36 may not be provided.

[0107] (Back waistline 40)

[0108] The back waistline portion 40 has a substantially similar structure to the ventral waistline portion 30. That is, the back waistline portion 40 is disposed on the non-skin side of the absorbent body 10, and has: a skin side sheet 41 disposed at the position closest to the skin side in the thickness direction; a non-skin side sheet 42 layered adjacent to the non-skin side of the skin side sheet 41; and back elastic members 45 and 47 provided between the skin side sheet 41 and the non-skin side sheet 42. In addition, it may also have a skin surface sheet 46, etc., similar to the ventral waistline portion 30 (see Figure 2 , Figure 3 ) and may also have a folded portion (not shown).

[0109] The skin side sheet 41 is a sheet member, and is formed of, for example, SMS nonwoven fabric, similarly to the abdominal waistline portion 30. The non-skin side sheet 42 is a sheet member, and is formed of, for example, SMS nonwoven fabric, etc.

[0110] The back waist elastic member 45 is a back elastic member along the transverse direction, and is a stretchable member that can be stretched in the transverse direction. In this embodiment, rubber threads are used. A plurality of back waist elastic members 45 are arranged in the up-down direction (longitudinal direction) between the skin side sheet 41 and the non-skin side sheet 42, and are installed in a transversely stretched state using adhesives such as hot melt adhesives. Through the stretchability exhibited by the back waist elastic member 45, the back waist portion 40 matches the back waist of the wearer. In addition, the diaper 1 of this embodiment uses rubber threads as the back waist elastic member 45 in the back waist portion 40, but a stretchable member such as a stretch sheet can also be configured to make the back waist portion 40 stretch in the transverse direction.

[0111] The appearance of the back waistline portion 40 is different from that of the ventral waistline portion 30. Figure 2 Thus, the buttocks region 40b is provided in a substantially trapezoidal shape at the lower side of the side joint 20 (side portion 40sw) in the vertical direction. In the buttocks region 40b, the lateral width increases from the lower side to the upper side in the vertical direction, and the buttocks region 40b is provided, so that the back waistline portion 40 can cover the buttocks of the wearer when the diaper 1 is worn. That is, the buttocks region 40b has a function as a buttocks cover.

[0112] Furthermore, in the buttocks region 40b, there is provided Figure 2 The diaper 1 is provided with a plurality of curved elastic members 47, each of which ...

[0113] The lower crotch elastic part 47a is a dorsal elastic member that can be stretched in the horizontal direction along the horizontal direction. The end elastic part 47a is located at a position that is closer to the back side than the side joint 20 of the ventral waistline part 30 and closer to the ventral side than the side joint 20 of the dorsal waistline part 40, and is a lower crotch side elastic part that is located at the lower crotch side compared to the dorsal waistline elastic member 45. The inclined elastic part 47b is an elastic member that is located at both sides of the dorsal waistline part 40 in the horizontal direction and closer to the ventral side (lower side) than the side joint 20. The inclined elastic part 47b is respectively inclined from the inner side in the horizontal direction to the outer side and from the ventral side to the dorsal side, and can be stretched in the direction that is inclined from the inner side in the horizontal direction to the outer side and from the ventral side to the dorsal side. The curved elastic member 47 is the same as the dorsal waistline elastic member 45, and is arranged in a plurality of positions in the vertical direction (vertical direction) between the skin side piece 41 and the non-skin side piece 42, and is installed in a state stretched in the desired direction using adhesives such as hot melt adhesives.

[0114] (Absorbent body 10)

[0115] The absorbent body 10 is placed against the crotch of the wearer when worn to absorb excrement such as urine. Figure 4 is a top view of the absorbent body 10. Figure 2 as well as Figure 4 In the figure, for convenience, the non-skin side elastic member 16 (described later) is indicated by a thick line, but this does not indicate the thickness or magnitude of the stretching force of the non-skin side elastic member 16. Figure 5A yes Figure 4 A schematic cross-sectional view as viewed in the X-X direction. Figure 5B yes Figure 4 A schematic cross-sectional view in the Y-Y direction. Figure 5C yes Figure 4 A schematic cross-sectional view in the Z-Z direction. Figure 5A A cross section taken along line XX is shown, and members located on the ventral side relative to XX are omitted. Figure 5B A cross section taken along line YY is shown, and members located on the ventral side relative to line YY are omitted. Figure 5C A cross section taken along line ZZ is shown, and members located on the ventral side relative to line ZZ are omitted.

[0116] The absorbent body 10 includes: an absorbent body 11 for absorbing excrement; a top sheet 12 disposed on the skin side relative to the absorbent body 11; a back sheet 14 disposed on the non-skin side relative to the absorbent body 11; an outer sheet 15; and a non-skin side elastic member (elastic member) 16. However, the absorbent body 10 may also include sheet members other than these. For example, a secondary sheet (not shown) may be provided between the top sheet 12 and the absorbent body 11.

[0117] The absorbent body 11 has an absorbent core 11a and a core wrap sheet 11b. The absorbent core 11a is a member that absorbs and retains excrement, and is formed, for example, of liquid-absorbent fibers such as pulp fibers mixed with superabsorbent polymers (SAP). The absorbent core 11a of the present embodiment is roughly hourglass-shaped when viewed from above. The absorbent core 11a has a ventral wide portion 11MA located on the ventral side relative to the center CL and a dorsal wide portion (wide portion) 11MB located on the dorsal side relative to the center CL. The details of the ventral wide portion 11MA and the dorsal wide portion 11MB will be described later. In addition, the shape of the absorbent core 11a is not limited to this shape, and may be any shape. In addition, in the present embodiment, the absorbent core 11a is set to be a single-layer absorbent core 11a, but the absorbent core 11a may also be in a state where two layers are overlapped in the thickness direction.

[0118] The outer peripheral surface of the absorbent core 11a is covered with a sheet member such as a liquid-permeable core wrap sheet 11b such as tissue or nonwoven fabric. In addition, the core wrap sheet 11b does not necessarily need to be provided.

[0119] The absorbent core 11a has a pair of deformation inducing portions S. The pair of deformation inducing portions S induces deformation of the absorbent core 11a. The deformation inducing portions S of this embodiment are grooves that are not penetrated in the thickness direction and are thinned, and are provided on the back side relative to the center CL. Figure 4 As shown in the figure, a pair of deformation inducing parts S are symmetrical about the transverse center line CC, and are straight grooves that are inclined from the ventral side to the dorsal side in the longitudinal direction and from the inner side to the outer side in the transverse direction. By having the deformation inducing parts S, the absorbent core 11a can be easily deformed starting from the deformation inducing parts S. However, the deformation inducing parts S can also be set to any shape and size according to the deformation of the absorbent core 11a. In addition, the deformation inducing parts S are not limited to grooves, and can also be structures that can induce deformation, such as through parts that penetrate in the thickness direction, or compressed parts that are compressed in the thickness direction. In addition, the deformation inducing parts S are not necessarily required.

[0120] The top sheet 12 is a liquid-permeable sheet, for example, a hydrophilic air-through nonwoven fabric or a spunbond nonwoven fabric is used. Figure 5A to Figure 5C In this way, both side portions in the lateral direction are folded back toward the non-skin side so as to wrap around the absorbent body 11 .

[0121] On the non-skin side of the absorbent body 11, there are a back sheet 14 and a hydrophobic outer sheet 15 arranged on the non-skin side. As the back sheet 14, for example, a resin film is used, and as the outer sheet 15, for example, a flexible nonwoven fabric is used. The outer sheet 15 is arranged on the non-skin side compared to the back sheet 14, and a leakage-proof wall portion 50 is formed at a position closer to the skin side than the top sheet 12.

[0122] like Figure 2 , Figure 4as well as Figure 5B As shown in the figure, a pair of non-skin side elastic members 16 are provided along the longitudinal direction at both ends of the absorbent body 10 between the back sheet 14 and the outer sheet 15 and in the crotch portion when worn. The crotch portion corresponds to the longitudinal direction between the ventral waistline portion 30 and the dorsal waistline portion 40 of the diaper 1 in the unfolded and stretched state. In the crotch portion, both ends of the diaper 1 are the both ends of the absorbent body 10. Specifically, as Figure 2 As shown in the figure, a pair of non-skin side elastic members 16 are elastic members that are shorter in length in the longitudinal direction than the leakage-proof wall elastic members 51 and 52 described later and can be stretched in the longitudinal direction, and are arranged between the ventral wide width portion 11MA and the back wide width portion 11MB of the absorbent core 11a and across the center CL. In this embodiment, three rubber threads along the longitudinal direction are fixed between the back sheet 14 and the outer sheet 15 by adhesives or the like in an extended state. By contraction of the non-skin side elastic members 16, when worn, it is easy to bend the shape of the absorbent core 11a, so that it is easy to make the longitudinal ends of the absorbent body 10 including the absorbent core 11a stand up toward the skin side, and it is easy to make the longitudinal central part concave.

[0123] A pair of leakage-proof wall portions 50 are provided on both sides of the absorbent body 10 in the transverse direction along the longitudinal direction of the absorbent body 10. In this embodiment, the leakage-proof wall portions 50 are formed by the outer sheet 15 and are provided with leakage-proof wall elastic members 51 and 52. Specifically, in the transverse direction, a portion of the outer sheet 15 extends outward from both side ends of the absorbent body 11, and as shown in FIG. Figure 5A to Figure 5C In this way, the leakage-preventing wall elastic members 51 and 52 are folded at a plurality of locations on the skin side and fixed to the exterior sheet 15 to form a pair of leakage-preventing wall portions 50 having a substantially S-shaped cross section.

[0124] The pair of leakage-proof wall portions 50 respectively include a skin-side leakage-proof wall portion 50a provided at the position closest to the skin side, and a non-skin-side leakage-proof wall portion 50b provided on the non-skin side relative to the skin-side leakage-proof wall portion 50a. In the skin-side leakage-proof wall portion 50a, four leakage-proof wall elastic members 51 are arranged and fixed along the longitudinal direction between the bent outer sheets 15. The four leakage-proof wall elastic members 51 are arranged to be closer to the end portion side of the outer side of the leakage-proof wall portion 50 in the transverse direction. In the non-skin-side leakage-proof wall portion 50b, two leakage-proof wall elastic members 52 are arranged and fixed along the longitudinal direction between the bent outer sheets 15. The two leakage-proof wall elastic members 52 are arranged to be closer to the end portion of the inner side of the leakage-proof wall portion 50 in the transverse direction. When the diaper 1 is worn, the leakage-proof wall portion 50 stands up toward the skin side of the wearer based on the elasticity of the leakage-proof wall elastic members 51 and 52, and matches the crotch of the wearer.

[0125] like Figure 4As shown in FIG. 1 , at both ends of the absorbent body 10, at each end of the ventral side and the dorsal side in the longitudinal direction of the diaper 1, an end fixing portion 53 is provided to fix the leakage-proof wall portion 50 in a manner that it cannot stand up. Each end fixing portion 53 has: a fixing portion that fixes at least a portion of the skin-side leakage-proof wall portion 50a and the non-skin-side leakage-proof wall portion 50b facing each other by an adhesive or the like; and a fixing portion that fixes at least a portion of the non-skin-side leakage-proof wall portion 50b and the top sheet 12 facing each other by an adhesive or the like. In the longitudinal direction of the absorbent body 10, the portion of the outer sheet 15 between the end fixing portions 53 becomes a portion of the leakage-proof wall portion 50 that can stand up. For example, when the wearer is in a sleeping position, even if the excrement blocked by the leakage-proof wall portion 50 flows forward and backward, the excrement can be blocked by the end fixing portions 53 at both ends in the longitudinal direction, and front leakage and rear leakage can be suppressed.

[0126] In addition, the absorbent body 10 has intermittent fixing portions 54 for fixing the leakage-proof wall portion 50 to the top sheet 12 at positions spaced apart in the longitudinal direction from the end fixing portions 53 on the ventral side and the end fixing portions 53 on the dorsal side. Figure 5A As shown, the intermittent fixing part 54 utilizes adhesive etc. to fix the non-skin side leakage-proof wall 50b and the top sheet 12 facing each other. By setting the intermittent fixing part 54 of the leakage-proof wall 50, the length of the part that can stand up in the horizontal direction is shortened, and the sagging of the absorbent core 11 when wearing can be suppressed.

[0127] Furthermore, if Figure 4 as well as Figure 5B As shown in FIG. 1 , the inner end of the leakage-proof wall 50 in the lateral direction has a pinching and fixing portion 55 for joining and fixing at least a portion of the skin-side leakage-proof wall 50a and the non-skin-side leakage-proof wall 50b facing each other. Specifically, the pinching and fixing portion 55 joins a portion of the skin-side leakage-proof wall 50a and the non-skin-side leakage-proof wall 50b using an adhesive or the like. The pinching and fixing portion 55 of this embodiment is provided along the longitudinal direction (longitudinal direction) of the absorbent body 10 ( Figure 4 ). By providing the pinching and fixing part 55, it is easy to maintain the folded shape of the leakage-proof wall part 50 formed by the outer sheet 15. In the wearing state, the leakage-proof wall part 50b on the non-skin side stands up toward the skin side through the leakage-proof wall elastic member 52 of the leakage-proof wall part 50b on the non-skin side, and the leakage-proof wall part 50a on the skin side is easy to come into surface contact with the wearer's skin through the leakage-proof wall elastic member 51 arranged on the leakage-proof wall part 50a on the skin side. In addition, since the pinching and fixing part 55 is a part with high rigidity, it is easy to maintain the surface shape of the leakage-proof wall part 50a on the skin side, and it is easy to firmly and closely contact with the wearer's skin.

[0128] The above-mentioned end fixing part 53, intermittent fixing part 54 and pinching fixing part 55 are respectively formed by applying adhesive, but are not limited to this. For example, they can also be formed by press-fitting means such as embossing. In addition, the end fixing part 53, the intermittent fixing part 54 and the pinching fixing part 55 are not limited to a rectangular shape when viewed from above, and can be any shape, or can be a structure in which one or more fixing parts are arranged horizontally or vertically. As the above-mentioned non-skin side elastic member 16 and the leak-proof wall elastic member 51, 52, a plurality of rubber threads are used respectively, but are not limited to this. For example, elastic components such as stretch sheets can also be used. In addition, it is also possible to have a structure in which only one elastic component such as a rubber thread is configured.

[0129] The absorbent body 10 has a pair of compression parts E (Ea, Eb) on both sides closer to the ventral side than the center CL. The compression part E is a compression part that is compressed by applying pressure in the thickness direction from the skin side in a state where the absorbent core 11a is covered by the core wrap sheet 11b. The pair of compression parts E includes a one-side compression part Ea located on one side in the lateral direction and an other-side compression part Eb located on the other side. The one-side compression part Ea and the other-side compression part Eb are symmetrical in shape with respect to the lateral center line CC. In the present embodiment, the one-side compression part Ea includes two compression parts Ea1 and Ea2 in a wavy shape that is continuous in the longitudinal direction, and the other-side compression part Eb includes two compression parts Eb1 and Eb2 in a wavy shape that is continuous in the longitudinal direction. By having a pair of compression parts E, the deformation of the absorbent core 11a is reduced, and the shape of the absorbent body 11 is easily maintained.

[0130] <About Deformation of Absorbent Core 11a>

[0131] Conventionally, although underpants-type absorbent articles have the advantage of being easy to wear, there is a problem that excrement leaks out of the lateral outer side of the underpants-type absorbent articles. In particular, when the wearer sleeps in a horizontal position, it is desired to reduce the possibility of excrement leaking out of the lateral outer side of the underpants-type absorbent articles. In contrast, diapers 1 such as Figure 6 As shown, by providing the recessed portion 11aH as a portion recessed toward the non-skin side in the longitudinal center and the transverse center portion 11ac of the absorbent core 11a, the possibility of excrement leaking outward from the transverse direction of the diaper 1 can be reduced. Figure 6 It is a figure which shows typically the shape of the absorbent core 11a when worn.

[0132] In the diaper 1 in the unfolded and extended state, the position at 1 / 2 of the distance LC from the end 40sc on the longitudinal center CL side among the lateral joining parts 20 in the dorsal waist part 40 to the longitudinal center CL of the diaper 1 is set as the reference position RP. The diaper 1 includes a pair of non-skin-side elastic members 16 along the longitudinal direction. The pair of non-skin-side elastic members 16 are provided at both end parts of the diaper 1 in the crotch part when worn. And, as Figure 2 shown, the transverse length W11ar of the absorbent core 11a at the reference position RP is greater than the transverse length W11ac of the absorbent core 11a at the longitudinal center CL of the diaper 1 (W11ac < W11ar). In addition, the value obtained by dividing the longitudinal length LR from the reference position RP to the dorsal end 11eb of the absorbent core 11a by the longitudinal length L11a of the absorbent core 11a is 30% or more (LR / L11a ≥ 30%).

[0133] Figure 7 is a diagram schematically illustrating the forces applied to the diaper 1 in the worn state. Figure 8A to Figure 8C is a diagram for explaining the deformation of the absorbent main body 10. Fig. 8A is a diagram illustrating the state where no force is applied to the absorbent main body 10. Figure 8B is a diagram illustrating the state where the contraction force of the non-skin-side elastic member 16 is applied to the absorbent main body 10. Figure 8C is a diagram illustrating the state where the contraction force of the non-skin-side elastic member 16 and the force generated by the wearer's legs are applied to the absorbent main body 10. Figure 8A to Figure 8C is a schematic diagram simplifying the components in the absorbent main body 10.

[0134] Regarding the diaper 1, the position at 1 / 2 of the distance LC (reference position RP) from the end 40sc on the longitudinal center CL side among the lateral joining parts 20 in the dorsal waist part 40 to the longitudinal center CL of the diaper 1 is a part where the wearer's legs are likely to come into contact with the diaper 1 in the worn state, and is a part where the force from the wearer's legs is likely to be applied to the diaper 1. In particular, the part of the wearer's legs that comes into contact with the reference position RP in the worn state, in addition to the wearer's legs, also has a part with a bulge towards the buttocks. Therefore, compared with the part ventral to the reference position RP, the thickness of the wearer's legs (including the buttocks) becomes thicker, and it is easier to apply a greater force towards the inner side in the transverse direction to the diaper 1 (absorbent main body 10) compared to the position ventral to the reference position RP. As Figure 7 、 Figure 8A to Figure 8C shown, the diaper 1 receives a force from the wearer's two legs towards the inner side in the transverse direction at the reference position RP, and the shape of the absorbent core 11a is deformed.

[0135] In the worn state, from Fig. 8AAs shown, no lateral force is applied from the wearer's legs. Figure 8B As shown in the figure, the longitudinal end of the absorbent body 10 (absorbent body 11) can be easily pulled toward the skin side by contraction of a pair of longitudinally stretchable non-skin-side elastic members 16 provided in the diaper 1 (absorbent body 10). The longitudinal end of the absorbent body 10 (absorbent body 11) can be pulled toward the skin side or the absorbent body 10 itself can be lifted toward the skin side by contraction of a pair of longitudinally stretchable non-skin-side elastic members 16 provided in the diaper 1 (absorbent body 10).

[0136] And, if Figure 8C As shown in FIG. 1 , if a force is applied from the wearer's leg from the outside to the inside in the lateral direction, as shown in FIG. Figure 8C As shown in the figure, the longitudinal force generated by the non-skin side elastic member 16 interacts with the lateral force generated by the wearer's legs, and tends to act toward the skin side (upper side) in the thickness direction and the obliquely upward force on the inner side in the lateral direction. Preferably, the lateral central portion 10c of the absorbent body 10 is recessed protruding toward the non-skin side, and the lateral end portion (also called "side end portion") 10e of the absorbent body 10 is raised toward the skin side. In addition, the force relative to the absorbent body 10 is also applied to the absorbent core 11a. Therefore, preferably, as shown in FIG. Figure 6 As shown, the central portion 11ac in the lateral direction of the absorbent core 11a is recessed toward the non-skin side, and both side ends 11ae of the absorbent core 11a are raised toward the skin side, thereby providing recessed portions 11aH.

[0137] In the diaper 1, the lateral length W11ar of the absorbent core 11a at the reference position RP is greater than the lateral length W11ac of the absorbent core 11a at the center CL (W11ar>W11ac), and the longitudinal length LR from the reference position RP to the end 11eb on the back side of the absorbent core 11a divided by the longitudinal length L11a of the absorbent core 11a is greater than 30% (LR / L11a≥30%). Therefore, compared with the case where the length W11ar is less than the length W11ac (W11ar<W11ac) and the value obtained by dividing the length LR by the length L11a is less than 30% (LR / L11a<30%), when the diaper 1 is worn, the two longitudinal ends of the absorbent core 11a are easily pulled toward the skin side by the contraction of a pair of non-skin side elastic components 16, and the lateral inward force generated by the wearer's legs is easily applied to the absorbent core 11a. That is, the longer the transverse length W11ac of the absorbent core 11a at the reference position RP is, the easier it is for the absorbent core 11a to be affected by the force generated by the wearer's legs, and the longer the longitudinal length LR from the reference position RP to the end 11eb on the back side of the absorbent core 11a is, the larger the concave portion 11aH can be formed on the back side of the absorbent core 11a, and thus, more excrement can be stored in the large concave portion 11a provided on the back side of the absorbent core 11a. The absorbent core 11a is affected by the force generated by the wearer's legs and the contraction force of the non-skin side elastic member 16, such as Figure 6 As shown, a recessed portion 11aH is formed so that the longitudinal center and the lateral center 11ac of the absorbent core 11a are recessed toward the non-skin side, and by forming the recessed portion 11aH over a wide range, more excrement can be stored in the recessed portion 11aH.

[0138] like Fig.9A As shown, if the absorbent core 11a has the recessed portion 11aH, excrement is easily accumulated in the recessed portion 11aH when the wearer is wearing the absorbent core 11a. Fig.9A 1 is a diagram for explaining the accumulation of excrement in a normal wearing state. The normal wearing state refers to the wearing state in which the wearer's pelvis is kept substantially parallel to the ground, such as in a sitting state or a standing state. Fig.9A As shown in FIG. 1 , by accumulating excrement in the recessed portion 11aH, the side end portion of the absorbent core 11a is more likely to prevent excrement from leaking outward in the lateral direction of the diaper 1, compared with the case where the recessed portion 11aH is not provided. Fig. 9B As shown, even when the wearer's pelvis is tilted relative to the ground, such as when the wearer sleeps in a sideways position, the side ends of the absorbent core 11a can easily prevent excrement from leaking outward in the lateral direction of the diaper 1. Fig. 9BThis is a diagram for explaining the accumulation of excrement in the tilted wearing state. Thus, even if the wearer of the diaper 1 is in a sleeping position, the excrement is easily retained by the recessed portion 11aH of the absorbent core 11a, and the leakage of excrement is easily blocked by the side end portion of the absorbent core 11a, thereby reducing the possibility of excrement leaking from the lateral outer side of the diaper 1.

[0139] Preferably, if Figure 2 As shown in the figure, the area of ​​the absorbent core 11a located at the back side of the longitudinal center CL of the diaper 1 is larger than the area of ​​the absorbent core 11a located at the ventral side of the longitudinal center CL of the diaper 1. In the diaper 1 of this embodiment, since the narrowing of the absorbent core 11a located at the ventral side of the center CL is set to be larger than the absorbent core 11a located at the back side of the center CL, it can be understood by visual inspection that the area of ​​the absorbent core 11a located at the back side of the center CL is larger than the area of ​​the absorbent core 11a located at the ventral side of the center. In addition, the comparison of the areas can be performed by known methods such as visual inspection or measurement based on image processing. Thus, compared with the case where the area of ​​the absorbent core 11a located on the ventral side of the center CL is smaller than the area of ​​the absorbent core 11a located on the back side of the center CL, it is easy to form the recessed portion 11aH provided in the absorbent core 11a in a large area on the back side of the absorbent core 11a, and the possibility of excrement leakage from the side end portion on the back side of the diaper 1 can be reduced. Since more excrement is easily accumulated in the large-area recessed portion 11aH provided on the back side of the absorbent core 11a, it is easy to reduce the possibility of excrement leakage from the side end portion on the back side of the diaper 1, especially when the wearer is in a horizontal sleeping position.

[0140] The absorbent core 11a has a narrowest portion 11N having the shortest length in the horizontal direction at the center portion in the longitudinal direction. The narrowest portion 11N of the diaper 1 of this embodiment is located on the ventral side relative to the center CL. The center C11n of the narrowest portion 11N is the center in the longitudinal direction between the end 11Na on the ventral side of the narrowest portion 11N and the end 11Nb on the back side of the narrowest portion 11N. It is preferable that the absorbent core 11a is as follows: Figure 4As shown in FIG. 1 , a length L11nb from the center C11n of the narrowest portion 11N to the back end 11eb of the absorbent core 11a is greater than a length L11na from the center C11n of the narrowest portion 11N to the ventral end 11ea of ​​the absorbent core 11a (L11nb>L11na). Therefore, compared with the case where the length L11nb from the center C11n of the narrowest part 11N to the end 11eb on the back side of the absorbent core 11a is less than the length L11na from the center C11n of the narrowest part 11N to the end 11ea on the ventral side of the absorbent core 11a (L11nb≤L11na), when worn, it is easy for the force generated by the wearer's legs to be applied to the part of the absorbent core 11a that is closer to the back side than the ventral part, and it is easy to deform the absorbent core 11a located on the back side, lift the side end 11ae of the back side of the absorbent core 11a toward the skin side, and easily form a recessed portion 11aH in which the central portion 11ac of the absorbent core 11a is recessed toward the non-skin side in the back side of the absorbent core 11a.

[0141] In addition, it is preferred that the diaper 1 has a dorsal waist elastic member 45 along the lateral direction and an absorbent core 11a provided on the skin side relative to the dorsal waist portion 40, and when viewed in the thickness direction, there is a portion where the absorbent core 11a and the dorsal waist elastic member 45 overlap at a position closer to the dorsal side than the reference position RP in the longitudinal direction. As described above, in the diaper 1 of this embodiment, the dorsal waist portion 40 has a plurality of dorsal waist elastic members 45 along the lateral direction that can be stretched and contracted in the lateral direction, and the absorbent body 10 is provided on the skin side relative to the dorsal waist portion 40, and therefore, the absorbent core 11a is provided on the skin side relative to the ventral waist portion 40. In addition, as Figure 2 As shown, when viewed in the thickness direction, four back waist elastic members 45 located on the center CL side among the plurality of back waist elastic members 45 overlap the absorbent core 11a at a position further back than the reference position RP in the longitudinal direction.

[0142] By contracting the back waist elastic member 45 overlapping the absorbent core 11a when viewed in the thickness direction, the absorbent core 11a can be easily brought into contact with the wearer's skin at a position closer to the back than the reference position RP. Thus, when worn, the absorbent core 11a can be less likely to separate from the wearer's skin or sag downward, thereby improving wearability when worn.

[0143] The back waistline portion 40 of the diaper 1 preferably has an end elastic portion 47a along the transverse direction at an end portion on the longitudinal center CL side and closer to the longitudinal center CL side than the side joint portion 20 (end portion 40sc), and preferably, at least a portion of the end elastic portion 47a is located on the ventral side (the longitudinal center CL side) relative to the end portion 11eb on the back side of the absorbent core 11a in the longitudinal direction. The diaper 1 of this embodiment is as shown in FIG. Figure 2 As shown in the figure, when viewed in the thickness direction, the end elastic part 47a of the back waist circumference part 40 overlaps with the absorbent core 11a, and all the end elastic parts 47a are located at the ventral side of the end 11eb of the back side of the absorbent core 11a in the longitudinal direction. In addition, the diaper 1 of this embodiment is a structure in which the end elastic parts 47a are respectively continuous to the inclined elastic parts 47b on both sides, but it is not limited to this. The end elastic parts 47a can also be partially cut off the rubber thread, or elastic components are locally arranged, and are locally arranged intermittently in the horizontal direction. In addition, the diaper 1 of this embodiment is a so-called 3-component type underwear type disposable diaper in which the ventral waist circumference part 30, the back waist circumference part 40 and the absorbent body 10 are respectively formed by separate components, but it is not limited to this. For example, it can also be a so-called 2-component type underwear type absorbent article in which the ventral waist circumference part and the back waist circumference part are continuous and formed as an integral outer body, and the absorbent (absorbent body) is attached to the outer body.

[0144] The contraction of the end elastic parts 47a exerts a force inward in the lateral direction on the absorbent core 11a. Therefore, in the wearing state, in addition to the force generated by the wearer's legs, the contraction force of the end elastic parts 47a also makes it easy for the lateral side ends 11ae of the absorbent core 11a to bulge toward the skin side and the lateral center part 11ac to protrude toward the non-skin side.

[0145] In addition, it is preferred that Figure 2 As shown in FIG. 1 , the transverse length W11ae of the absorbent core 11a at the end 47ae on the longitudinal center CL side of the end elastic portion 47a is greater than the transverse length W11ac of the absorbent core 11a at the longitudinal center CL of the diaper 1, and is less than the transverse length W11ar of the absorbent core 11a at the reference position RP (W11ar≥W11ae>W11ac). In addition, the end elastic portion 47a may be partially cut off the rubber thread or partially arranged with an elastic member, etc., so as to be arranged intermittently in the transverse direction.

[0146] By making the lateral length W11ac of the absorbent core 11a at the center CL smaller than the lateral length W11ae of the absorbent core 11a at the end 47ae on the longitudinal center CL side of the end elastic portion 47a and the lateral length W11ar of the absorbent core 11a at the reference position RP, the possibility of the absorbent core 11a interfering with the movement of the wearer's legs in the crotch when worn is reduced, compared with the case where the length W11ac is larger than the length W11ae or the length W11ar, thereby improving the wearability. In addition, by setting the lateral length W11ar of the absorbent core 11a at the reference position RP to be greater than the lateral length W11ae of the absorbent core 11a at the end 47ae on the longitudinal center CL side of the end elastic portion 47a, compared with the case where the length W11ar is smaller than the length W11ae, when worn, the absorbent core 11a is easily subjected to the lateral force generated by the wearer's legs at the reference position RP, and then to the lateral contraction force of the end elastic portion 47a toward the lateral inner side, thereby easily promoting a shape in which the lateral side end 11ae of the absorbent core 11a bulges toward the skin side and the lateral center portion 11ac protrudes toward the non-skin side.

[0147] Preferably, the back waistline portion 40 has a pair of inclined elastic portions 47b at both ends in the lateral direction and closer to the longitudinal center CL side than the side joint portion 20, which are inclined from the inner side in the lateral direction toward the outer side and from the longitudinal center CL side toward the back side. Figure 2 As shown in the figure, at least a part of the inclined elastic part 47b is arranged on the back side relative to the reference position RP in the longitudinal direction. Therefore, in the part of the back waistline part 40 that is closer to the back side than the reference position RP, the force that acts inward in the transverse direction and toward the back side (upper side in the wearing state) in the longitudinal direction is formed by the contraction of the inclined elastic part 47b with respect to the absorbent core 11a. In the wearing state, the part of the absorbent core 11a that is closer to the back side than the reference position RP is easily lifted up in the transverse direction toward the upper side (skin side), and the shape that makes the transverse center part 11ac protrude toward the non-skin side is easily formed.

[0148] In addition, it is preferred that Figure 4As shown in the figure, the absorbent core 11a has a pair of deformation inducing parts S which are inclined from the ventral side to the dorsal side in the longitudinal direction and from the inner side to the outer side in the transverse direction. By having the deformation inducing parts S, when the absorbent core 11a is subjected to the force generated by the wearer's legs or the force generated by the non-skin side elastic member 16 in the wearing state, the deformation inducing parts S become the starting point for deformation of the absorbent core 11a, and the deformation of the absorbent core 11a along the shape of the deformation inducing parts S is easily promoted. The deformation inducing parts S of the diaper 1 of this embodiment are as described above, and the pair of deformation inducing parts S are straight grooves of a shape symmetrical about the transverse center line CC. The deformation inducing parts S are not limited to grooves, and preferably are parts with different rigidity in the absorbent core 11a, such as through parts that penetrate in the thickness direction or compressed parts that are compressed in the thickness direction.

[0149] A pair of deformation inducing portions S is preferably as follows Figure 4 As shown in the figure, the ends on the ventral side (the longitudinal center CL side) are separated from each other. In the absorbent core 11a, the portion provided with the deformation inducing portion S is the portion where the absorbent core 11a is easily deformed. If the pair of deformation inducing portions S are not separated from each other but the pair of deformation inducing portions S are continuous, the absorbent core 11a is deformed starting from the deformation inducing portion S that is continuous in the transverse direction, and the portion of the deformation inducing portion S is likely to become a groove along the transverse direction, which may hinder the diffusion of excrement in the longitudinal direction. In particular, in the case of a sleeping posture, when the pair of deformation inducing portions S are not separated from each other, in the absorbent core 11a, excrement discharged to the rear side of the deformation inducing portion S diffuses from the deformation inducing portion S toward the ventral side, and there is a possibility that excrement leaks from the end of the back side in the longitudinal direction of the diaper 1. In contrast, by separating the pair of deformation inducing portions S from each other, the possibility of hindering the diffusion of excrement in the absorbent core 11a in the longitudinal direction can be reduced. In addition, when the ends of the pair of deformation inducing parts S on the ventral side are not separated but continuous, the force from the outside on the absorbent core 11a is likely to be concentrated on the ends of the pair of deformation inducing parts S on the ventral side, and there is a possibility that the absorbent core 11a is deformed in the opposite way to the intention. By separating the ends of the pair of deformation inducing parts S on the ventral side, the force applied to the absorbent core 11a from the outside is likely to be alleviated in the portion where the ends of the pair of deformation inducing parts S on the ventral side are separated from each other. Therefore, the deformation of the absorbent core 11a along the deformation inducing parts S is likely to be promoted.

[0150] Furthermore, it is preferred that Figure 4As shown in the figure, the end of the ventral side of the deformation inducing portion S is located on the ventral side of the reference position RP. That is, at least a part of the deformation inducing portion S is provided on the central CL side compared to the reference position RP. By providing the deformation inducing portion S located on the ventral side compared to the reference position RP, the deformation of the absorbent core 11a on the ventral side compared to the reference position RP is promoted by inducing the deformation of the deformation inducing portion S which is inclined from the inner side to the outer side in the lateral direction, and the deformation of the absorbent core 11a which makes the lateral central portion 11ac protrude toward the non-skin side is easily promoted from the ventral side compared to the reference position RP to the back side compared to the reference position RP along the shape of the deformation inducing portion S. Furthermore, in the worn state, excrement is easily retained in the lateral central portion 11ac of the absorbent core 11a.

[0151] When the absorbent body 10 is provided with a leakage-proof wall portion 50 having leakage-proof wall elastic members 51 and 52 extending in the longitudinal direction at both ends in the transverse direction as in the diaper 1, it is preferable that Figure 4 As shown in the figure, in the lateral direction, the pair of deformation inducing portions S are provided inside the leakage-proof wall portion 50. Thus, the pair of deformation inducing portions S facilitates the deformation of the lateral central portion 11ac of the absorbent core 11a so as to protrude toward the non-skin side, and the leakage-proof wall portion 50 provided outside the deformation inducing portions S in the lateral direction reduces the possibility of excrement leaking to the lateral outer side of the diaper 1 (absorbent body 10).

[0152] When the diaper 1 includes the end elastic portions 47a, it is more preferable that at least a portion of the end elastic portions 47a is located closer to the ventral side (center CL side) than the dorsal ends of the pair of deformation inducing portions S in the longitudinal direction. Figure 2 As shown in the figure, the end of the back side of the deformation inducing part S is provided at a position closer to the back side than the three end elastic parts 47a. By providing such end elastic parts 47a and the deformation inducing part S, the deformation induction by the deformation inducing part S, which makes the lateral central part 11ac of the absorbent core 11a protrude toward the non-skin side, is more easily promoted by the force toward the lateral inner side generated by the end elastic parts 47a, and the lateral central part 11ac of the absorbent core 11a is more easily recessed, and the excrement is easily retained in the central part 11ac.

[0153] In addition, the diaper 1 is in the unfolded and stretched state. Figure 2As shown in the figure, it is provided with a pair of non-skin side elastic members 16 along the longitudinal direction, which are arranged at the crotch portion when worn and at both side ends of the diaper 1. In addition, the absorbent core 11a of the diaper 1 has a back wide width portion 11MB which is wider than the absorbent core 11a at the center CL at a position on the back side of the longitudinal center CL of the diaper 1, and the value obtained by dividing the longitudinal length L11mb of the back wide width portion 11MB by the longitudinal length L11a of the absorbent core 11a is 30% or more (L11mb / L11a≥30%).

[0154] The back wide portion 11MB of the present embodiment is a portion of the absorbent core 11a that includes the longest back portion of the absorbent core 11a in the horizontal direction and has the longest length at the back side relative to the center CL of the longitudinal direction of the diaper 1, and refers to a region where the value obtained by dividing the length of the absorbent core 11a in the horizontal direction by the length W11mb of the longest back portion is 90% or more. However, as in the absorbent core 11a of the diaper 1 of the present embodiment, the end portion of the back side of the absorbent core 11a may have rounded corners due to manufacturing factors and the like (see FIG. 11 ). Figure 2 etc.), however, the back wide portion 11MB of such an absorbent core 11a is treated as a structure without roundness. That is, the back wide portion 11MB of the absorbent core 11a of the present embodiment refers to a portion on the back side of the absorbent core 11a that is closer to the center CL in the longitudinal direction, and is an area from the position on the ventral side (center CL side) having a length of 90% of the length of the lateral length of the absorbent core 11a divided by the length W11mb of the longest back portion to the end 11eb on the back side of the absorbent core 11a. Similarly, the ventral wide portion 11MA of the present embodiment is a portion of the absorbent core 11a that is closer to the ventral side than the center CL in the longitudinal direction of the diaper 1, including the ventral longest portion of the absorbent core 11a that has the longest lateral length, and refers to an area where the value obtained by dividing the lateral length of the absorbent core 11a by the length W11ma of the longest ventral portion is greater than 90%. However, as in the absorbent core 11a of the diaper 1 of the present embodiment, the end portion on the ventral side of the absorbent core 11a may have rounded corners due to manufacturing reasons and the like (see FIG. Figure 2 The ventral wide portion 11MA of the absorbent core 11a of the present embodiment is treated as a non-rounded structure. That is, the ventral wide portion 11MA of the absorbent core 11a of the present embodiment refers to the portion of the absorbent core 11a that is closer to the ventral side than the longitudinal center CL, from the back side (center CL side) having a length that is 90% or more of the lateral length of the absorbent core 11a divided by the length Wma of the longest ventral portion to the end 11ea of ​​the ventral side of the absorbent core 11a. In addition, Figure 4 In the figure, the ventral wide portion 11MA is indicated by the oblique lines extending downward to the right, and the dorsal wide portion 11MB is indicated by the oblique lines extending downward to the left.

[0155] The absorbent core 11a of the diaper 1 is set to a value obtained by dividing the longitudinal length H11mb of the back wide portion 11MB by the longitudinal length L11a of the absorbent core 11a by 30% or more. Compared with the case where the value obtained by dividing the longitudinal length H11mb of the back wide portion 11MB by the longitudinal length L11a of the absorbent core 11a is less than 30%, the absorbent core 11a is more likely to be subjected to the force from the wearer's legs when worn ( Figure 7 ). Generally speaking, the longer the longitudinal length H11mb of the back wide portion 11MB is relative to the longitudinal length L11a of the absorbent core 11a, the easier it is to be affected by the force generated by the wearer's legs when the absorbent core 11a is worn. If the absorbent core 11a is affected by the force generated by the wearer's legs from the outside to the inside in the lateral direction, its shape can be deformed.

[0156] When wearing, Fig. 8A As shown, no lateral force is applied from the wearer's legs. Figure 8B As shown in the figure, the absorbent body 10 (absorbent body 11) can be easily contracted in the longitudinal direction by contracting the pair of non-skin side elastic members 16 along the longitudinal direction that can be stretched and contracted in the longitudinal direction provided in the diaper 1 (absorbent body 10), and when the absorbent body 10 is viewed from the side, it is easy to deform into a substantially U-shape, and the transverse ends can be easily pulled up toward the skin side by contracting the non-skin side elastic members 16 provided at both side ends of the absorbent body 10. The pair of non-skin side elastic members 16 along the longitudinal direction that can be stretched and contracted in the longitudinal direction provided at both side ends of the diaper 1 (absorbent body 10) can be bent so that the longitudinal central portion of the absorbent body 10 (absorbent body 11) protrudes toward the non-skin side, or pulls up the transverse ends toward the skin side, or lifts the absorbent body 10 itself toward the skin side by contracting in the longitudinal direction.

[0157] And, if Figure 8C As shown in FIG. 1 , if a force is applied from the wearer's leg from the outside to the inside in the lateral direction, as shown in FIG. Figure 8C As shown in the figure, the longitudinal force generated by the non-skin side elastic member 16 and the lateral force generated by the wearer's legs interact with each other, and a force is easily applied toward the skin side (upper side) in the thickness direction and the inner side in the lateral direction toward the oblique upper side. Preferably, the lateral central portion 10c of the absorbent body 10 is recessed in a manner protruding toward the non-skin side, and the side end portions 10e of the absorbent body 10 are raised in a manner lifted toward the skin side. In addition, preferably, the force relative to the absorbent body 10 is also applied to the absorbent core 11a, so that the lateral central portion 11ac of the absorbent core 11a is recessed toward the non-skin side, and the side end portions 11ac of the absorbent core 11a are raised toward the skin side, and a recessed portion 11aH ( Figure 6 ).

[0158] In the diaper 1, by setting the value obtained by dividing the longitudinal length H11mb of the back wide portion 11MB of the absorbent core 11a by the longitudinal length L11a of the absorbent core 11a to be 30% or more, compared with the case where the value obtained by dividing the longitudinal length H11mb of the back wide portion 11MB by the longitudinal length L11a of the absorbent core 11a is less than 30%, when the diaper 1 is worn, the two longitudinal ends of the absorbent core 11a are easily pulled toward the skin side by the contraction of a pair of non-skin side elastic members 16, and the lateral inward force generated by the wearer's legs is easily applied to the absorbent core 11a. As a result, Figure 6 As shown in the figure, it is easy to form the depressed part 11aH which is depressed toward the non-skin side in the center part in the longitudinal direction and the center part 11ac in the lateral direction of the absorbent core 11a.

[0159] Since the absorbent core 11a has the recessed portion 11aH, when the wearer wears the absorbent core 11a, Fig.9A As shown in FIG. 1 , it is easy to store excrement in the recessed portion 11aH. Fig.9A As shown in FIG. 1 , by accumulating excrement in the recessed portion 11aH, the side end portion 11ae of the absorbent core 11a is more likely to prevent excrement from leaking outward in the lateral direction of the diaper 1, compared with the case where the recessed portion 11aH is not provided. Fig. 9B As shown in the figure, even when the wearer is in a horizontal sleeping position and the wearer's pelvis is tilted relative to the ground, the side end 11ae of the absorbent core 11a can easily block the excrement from leaking outwardly in the lateral direction of the diaper 1. Therefore, in the wearing state, no matter what the wearer's posture is, the excrement is easily retained by the concave portion 11aH of the absorbent core 11a, and the leakage of the excrement is easily blocked by the side end 11e of the absorbent body 11, thereby reducing the possibility of excrement leaking outwardly in the lateral direction of the diaper 1.

[0160] In addition, it is preferred that Figure 4 As shown in FIG. 1 and FIG. 2 , the length L11mb in the longitudinal direction of the back wide portion 11MB is greater than twice the length L11ma in the longitudinal direction of the belly wide portion 11MA (L11mb>L11ma×2).

[0161] Preferably, the absorbent core 11a has a recessed portion 11aH in the back portion of the absorbent core 11a, which is a structure capable of storing excrement. On the other hand, the ventral portion of the absorbent core 11a in the ventral portion of the center CL is a portion that receives liquid generated by urination when worn, and therefore, preferably, by being formed in a shape along the body of the wearer, the ventral portion of the center CL is close to the skin of the wearer, and the ventral portion of the center CL is easily close to the urine outlet (urethral opening), and preferably, no space is provided between the ventral portion of the center CL and the urine outlet. Therefore, by making the longitudinal length L11mb of the back wide portion 11MB of the absorbent core 11a greater than twice the longitudinal length L11ma of the ventral wide portion 11MA, the absorbent core 11a in the wearing state can easily maintain the shape of the portion closer to the ventral side than the center CL, and it is easy to apply the force from the lateral outside to the inside generated by the wearer's legs to the back wide portion 11MB closer to the back side of the center CL. As a result, the portion closer to the ventral side than the center CL in the absorbent core 11a can maintain the shape along the body of the wearer, and the portion closer to the ventral side than the center CL can be close to the urine discharge outlet, so that it is easy to absorb excrement such as urine. The part of the absorbent core 11a on the back side than the center CL receives the force generated by the legs of the wearer, and the lateral central part 11ac of the absorbent core 11a is bent and recessed toward the non-skin side, and the lateral end 11ae of the absorbent core 11a is lifted and bulged toward the skin side, so that the recessed part 11aH is easily formed. That is, the part of the diaper 1 on the ventral side than the center CL is easy to absorb excrement such as urine, and the lateral end 11ae of the absorbent core 11a on the back side than the center CL is easy to block the leakage of excrement, which can reduce the possibility of excrement leakage from the lateral outer side of the diaper 1.

[0162] ===Other embodiments of the first embodiment ===

[0163] Above, the embodiments of the present invention have been described, but the above embodiments are intended to facilitate the understanding of the present invention and are not intended to be restrictive interpretations of the present invention. In addition, the present invention may be changed or improved without departing from its concept, and the present invention certainly includes equivalent configurations.

[0164] In the above-mentioned embodiment, a so-called three-part pant-type diaper having an absorbent body 10, a ventral waistline portion 30, and a dorsal waistline portion 40 is exemplified, but it is not limited thereto. For example, a so-called two-part pant-type diaper having an outer body and an absorbent body that are continuous and integrally formed with a ventral waistline portion and a dorsal waistline portion may also be used. For example, in a so-called two-part pant-type diaper (a diaper composed of an outer body and an absorbent body), in the longitudinal direction, the area overlapping with the side joint is set as the waistline portion (ventral waistline portion, dorsal waistline portion). In this two-part type diaper, an elastic member is sometimes arranged in an area exceeding the ventral waistline portion or the dorsal waistline portion. With respect to such an elastic member, in the unfolded and stretched diaper, when the length of the portion arranged on the dorsal side compared to the center in the longitudinal direction is greater than the length of the portion arranged on the ventral side compared to the center in the longitudinal direction, it is set as the dorsal elastic member of the dorsal waistline portion.

[0165] In the above-mentioned embodiment, the back waist circumference portion 40 has a curved elastic member 47 which is continuous in the order of the inclined elastic portion 47b, the end elastic portion 47a, and the inclined elastic portion 47b in the transverse direction, but the present invention is not limited thereto. The inclined elastic portion 47b and the end elastic portion 47a may also be discontinuous. In addition, the back waist circumference portion 40 may be a configuration having only one of the end elastic portion 47a and the inclined elastic portion 47b, or may be a configuration not having both the end elastic portion 47a and the inclined elastic portion 47b. Furthermore, the end elastic portion 47a and the inclined elastic portion 47b may be partially cut off, respectively.

[0166] In the above-mentioned embodiment, the diaper 1 has a pair of non-skin side elastic members 16 (elastic members) along the longitudinal direction, but is not limited thereto. For example, the diaper 1 may also be a pair of elastic members along the longitudinal direction such as a pair of leak-proof wall elastic members 51, 52 that can be stretched in the longitudinal direction in the unfolded state or a pair of leg gathers (not shown) that can be stretched in the longitudinal direction, etc., instead of the non-skin side elastic member 16 that is located closer to the non-skin side than the absorbent core 11a.

[0167] ===Second Embodiment===

[0168] As the absorbent article involved in the present invention, a pant-type disposable diaper 1 for adults (hereinafter also referred to as "diaper 1") is exemplified. However, the absorbent article involved in the present invention may also be a belt-type disposable diaper, a pant-type sanitary napkin, a sanitary napkin for menstruation, a light incontinence pad, an absorbent pad, etc. In addition, the wearer of the absorbent article is not limited to an adult, and may also be a living being such as an infant or an animal.

[0169] <Structure of Diaper 1>

[0170] Fig.10It is a schematic perspective view of the diaper 1. Fig.11 This is a plan view of the diaper 1 in the unfolded and stretched state as viewed from the skin side. Fig.12 yes Fig.11 A schematic cross-sectional view taken along the A-A line of the diaper 1. In addition, the "expanded state" refers to the following state: the side joints 20 of the side portions of the panty-type diaper 1, which are the joints of the side portions (side ends) 30sw of the ventral waistline portion 30 and the side portions (side ends) 40sw of the dorsal waistline portion 40, are separated and opened, respectively, and the diaper 1 is unfolded as a whole into a plane. The "stretched state" refers to the following state: the elastic components of the diaper 1 are stretched to the extent that the wrinkles of the diaper 1 cannot be visually recognized. Specifically, it is a state in which the dimensions of each component constituting the diaper 1 (such as the ventral waistline portion 30 described later, etc.) are stretched to a size that is consistent with or close to the dimensions of the component itself. On the other hand, with respect to the stretched state, the state in which each elastic body in a non-stretched state naturally shrinks and wrinkles are generated on the components shown in the top view, etc., is called a "natural state". Fig.11 The CC line in the diagram is the center line in the horizontal direction (also called the "lateral center CC"), and the CL line is the center line in the vertical direction (also called the "longitudinal center CL").

[0171] The diaper 1 in a pant-type state has mutually intersecting up-down directions, lateral directions, and front-to-back directions, and has a waist opening BH and a pair of leg openings LH, LH. The upper side in the up-down direction corresponds to the waist opening BH side, and the lower side corresponds to the crotch side. The front side in the front-to-back direction corresponds to the ventral side of the wearer, and the back side corresponds to the back side of the wearer. The lateral direction is the direction along the expansion and contraction direction of the ventral waist elastic components 35, 45 of the ventral waist portion 30 and the dorsal waist portion 40. The longitudinal direction of the diaper 1 in the unfolded and stretched state is equivalent to the length direction of the absorbent body 10, and is the direction along the up-down direction of the diaper 1 in the pant-type state. In addition, as Fig.12 As shown in FIG. 1 and FIG. 2 , the direction in which the materials constituting the diaper 1 are stacked is referred to as the thickness direction. In the thickness direction, the side in contact with the wearer's skin is referred to as the skin side, and the opposite side is referred to as the non-skin side.

[0172] The diaper 1 is a so-called three-component type pant-type diaper, and comprises a liquid-absorbent main body 10, an abdominal waistline portion 30 covering the abdominal part of the wearer, and a back waistline portion 40 covering the back part of the wearer.

[0173] like Fig.11As shown in the figure, in the unfolded and stretched state, the ventral waistline 30 and the dorsal waistline 40 are arranged parallel to each other with a gap in the longitudinal direction, and the absorbent body 10 is laid between them, and the ends 10ea and 10eb in the longitudinal direction of the absorbent body 10 are respectively joined and fixed to the skin side of the waistline 30 and 40 closest to each other, and the appearance shape presents a roughly H shape when viewed from above. And from this state, the center position (center line) CL in the longitudinal direction of the absorbent body 10 is folded in half as the folding position. That is, the lower end of the diaper 1 in the underpants-type state in the vertical direction corresponds to the center CL of the diaper 1 in the unfolded and stretched state. In this folded state, the ventral waistline 30 and the dorsal waistline 40 facing each other are joined and connected to each other at the side parts 30sw and the side parts 40sw on both sides in the transverse direction to form a pair of side joints 20, 20. That is, the ventral waistline portion 30 and the dorsal waistline portion 40 are formed into a ring shape by a pair of side joint portions 20, 20. Fig.10 The diaper 1 is in a pull-on state with a waist opening BH and a pair of leg openings LH, LH formed as shown. The side joints 20 are formed by known joining means such as welding or bonding.

[0174] (Abdominal waist circumference 30)

[0175] The ventral waistline portion 30 is disposed on the non-skin side of the absorbent body 10. Fig.12 As shown in the figure, the ventral waistline portion 30 has: a skin side sheet 31 disposed at a position closest to the skin side in the thickness direction; a non-skin side sheet 32 ​​stacked in a manner adjacent to the non-skin side of the skin side sheet 31; and a ventral waistline elastic member 35 provided between the skin side sheet 31 and the non-skin side sheet 32. The ventral waistline portion 30 is basically a two-layer structure of the skin side sheet 31 and the non-skin side sheet 32, and may also have a structure of more than three layers, such as a skin top sheet 36 (described later).

[0176] The skin side sheet 31 is a rectangular sheet member when viewed from above, and is formed of, for example, SMS nonwoven fabric. The non-skin side sheet 32 ​​is a rectangular sheet member formed of nonwoven fabric when viewed from above, and is formed of, for example, SMS nonwoven fabric. The skin side sheet 31 and the non-skin side sheet 32 ​​can be of any size and shape. In addition, the upper end or the lower end of the non-skin side sheet 32 ​​has a folded portion folded back from the non-skin side toward the skin side and from the front side toward the back side in the longitudinal direction.

[0177] The ventral waist elastic member 35 is a ventral elastic member along the transverse direction, and is a stretchable member that can be stretched in the transverse direction. In this embodiment, a plurality of rubber threads are used. A plurality of ventral waist elastic members 35 are arranged in the up-down direction (longitudinal direction) between the skin side sheet 31 and the non-skin side sheet 32, and are installed in a transversely stretched state using adhesives such as hot melt adhesives. Through the stretchability exhibited by the ventral waist elastic member 35, the ventral waist portion 30 matches the ventral waist of the wearer. In addition, the diaper 1 of this embodiment uses rubber threads as the ventral waist elastic member 35 in the ventral waist portion 30, but a stretchable member such as a stretch sheet can also be configured to make the ventral waist portion 30 stretch in the transverse direction.

[0178] In addition, the ventral waistline portion 30 has a skin surface sheet 36. The skin surface sheet 36 is as follows Fig.12 The sheet member arranged in a manner to cover the upper end of the absorbent body 10 from the skin side as shown in the figure has the function of a cover sheet. Thus, when the diaper 1 is worn, it is possible to prevent the absorbent body 10 from detaching from the ventral waistline portion 30, or the superabsorbent polymer (SAP) or excrement forming the absorbent core 11a in the absorbent body 10 from leaking from the upper end of the absorbent body 10, or the upper end of the absorbent body 10 from digging into the skin of the wearer. The skin sheet 36 is formed of, for example, SMS nonwoven fabric. In addition, the skin sheet 36 may not be provided.

[0179] (Back waistline 40)

[0180] The back waistline portion 40 has a substantially similar structure to the ventral waistline portion 30. That is, the back waistline portion 40 is disposed on the non-skin side of the absorbent body 10, and has: a skin side sheet 41 disposed at the position closest to the skin side in the thickness direction; a non-skin side sheet 42 layered adjacent to the non-skin side of the skin side sheet 41; and back elastic members 45, 47 provided between the skin side sheet 41 and the non-skin side sheet 42. In addition, it may also have a skin top sheet 46, etc., similar to the ventral waistline portion 30 (see Fig.11 , Fig.12 ) and may also have a folded portion (not shown).

[0181] The skin side sheet 41 is a sheet member, and is formed of, for example, SMS nonwoven fabric, similarly to the abdominal waistline portion 30. The non-skin side sheet 42 is a sheet member, and is formed of, for example, SMS nonwoven fabric, etc.

[0182] The back waist elastic member 45 is a back elastic member along the transverse direction, and is a stretchable member that can be stretched in the transverse direction. In this embodiment, rubber threads are used. A plurality of back waist elastic members 45 are arranged in the up-down direction (longitudinal direction) between the skin side sheet 41 and the non-skin side sheet 42, and are installed in a transversely stretched state using adhesives such as hot melt adhesives. Through the stretchability exhibited by the back waist elastic member 45, the back waist portion 40 matches the back waist of the wearer. In addition, the diaper 1 of this embodiment uses rubber threads as the back waist elastic member 45 in the back waist portion 40, but a stretchable member such as a stretch sheet can also be configured to make the back waist portion 40 stretch in the transverse direction.

[0183] The appearance of the back waistline portion 40 is different from that of the ventral waistline portion 30. Fig.11 Thus, the portion below the side joint 20 (side portion 40sw) in the vertical direction (longitudinal direction) has a buttocks region 40b having a substantially trapezoidal shape. In the buttocks region 40b, the lateral width increases from the lower side to the upper side in the vertical direction. By providing the buttocks region 40b, the buttocks of the wearer can be covered by the back waistline portion 40 when the diaper 1 is worn. That is, the buttocks region 40b has a function as a buttocks cover.

[0184] Furthermore, in the buttocks region 40b, there is provided Fig.11 The diaper 1 is provided with a plurality of curved elastic members 47, each of which ...

[0185] The end elastic portion 47a is a dorsal elastic member that can be stretched in the transverse direction along the transverse direction. The end elastic portion 47a is located at a position that is closer to the dorsal side than the lateral joint portion 20 of the ventral waistline portion 30 and closer to the ventral side than the lateral joint portion 20 of the dorsal waistline portion 40, and is a lower crotch side elastic portion that is located on the lower crotch side compared to the dorsal waistline elastic member 45. The end elastic portion 47a is along the transverse direction and can be stretched in the transverse direction. The inclined elastic portion 47b is a dorsal elastic member that is located on both sides of the dorsal waistline portion 40 in the transverse direction and is located on the ventral side (lower side) compared to the lateral joint portion 20. The inclined elastic portion 47b is inclined from the inner side in the transverse direction toward the outer side and from the ventral side toward the dorsal side, respectively, and can be stretched and retracted in a direction that is inclined from the inner side in the transverse direction toward the outer side and from the ventral side toward the dorsal side. Similar to the back waist elastic members 45, a plurality of curved elastic members 47 are arranged in the vertical direction (longitudinal direction) between the skin side sheet 41 and the non-skin side sheet 42, and are attached using an adhesive such as a hot melt adhesive in a state stretched in a desired direction.

[0186] (Absorbent body 10)

[0187] When worn, the absorbent body 10 is placed against the crotch of the wearer to absorb excrement such as urine. Fig.13 is a top view of the absorbent body 10. Fig.11 In the figure, for convenience, the non-skin side elastic member 16 (described later) is shown by a thick line, but this does not indicate the thickness or magnitude of the stretching force of the non-skin side elastic member 16. Fig.14A yes Fig.13 A schematic cross-sectional view as viewed in the X-X direction. Fig. 14B yes Fig.13 A schematic cross-sectional view in the Y-Y direction. Fig. 14C yes Fig.13 A schematic cross-sectional view in the Z-Z direction. Fig.14A A cross section taken along line XX is shown, and members located on the ventral side of XX are omitted. Fig. 14B The cross section taken along the line YY is shown, and members located on the ventral side of the line YY are omitted. Fig. 14C A cross section taken along the line ZZ is shown, and members located on the ventral side of the line ZZ are omitted.

[0188] The absorbent body 10 includes: an absorbent body 11 for absorbing excrement; a top sheet 12 disposed on the skin side relative to the absorbent body 11; a back sheet 14 disposed on the non-skin side relative to the absorbent body 11; an outer sheet 15; and a non-skin side elastic member (elastic member) 16. However, the absorbent body 10 may also include sheet members other than these. For example, a secondary sheet (not shown) may be provided between the top sheet 12 and the absorbent body 11.

[0189] The absorbent body 11 has an absorbent core 11a and a core wrap sheet 11b. The absorbent core 11a is a member that absorbs and retains excrement, and is formed, for example, of liquid-absorbent fibers such as pulp fibers mixed with superabsorbent polymers (SAP). In addition, the absorbent core 11a is generally uniformly arranged with liquid-absorbent fibers and SAP throughout the entire area, and the basis weight (weight per unit area) of the absorbent core 11a is generally constant. The absorbent core 11a of this embodiment is generally hourglass-shaped when viewed from above. The absorbent core 11a has a narrowing portion with a shortened lateral length in the central portion in the longitudinal direction, and has a narrowest portion 11N with the shortest lateral length of the absorbent core 11a in the portion closer to the ventral side than the center CL. The ventral widest portion 11MA and the dorsal widest portion 11MB with the largest lateral length of the absorbent core 11a are respectively provided in the portions closer to the ventral side and the dorsal side than the center CL in the longitudinal direction. The lengths of the ventral widest portion 11MA and the dorsal widest portion 11MB are approximately the same. In addition, the shape of the absorbent core 11a is not limited to this shape, and any shape may be used. In addition, in this embodiment, the absorbent core 11a is used as a single layer, but the absorbent core 11a may be a state in which two layers are stacked in the thickness direction.

[0190] The outer peripheral surface of the absorbent core 11a is covered with a sheet member such as a liquid-permeable core wrap sheet 11b such as tissue or nonwoven fabric. In addition, the core wrap sheet 11b does not necessarily need to be provided.

[0191] The absorbent core 11a has a pair of deformation inducing portions S. The pair of deformation inducing portions S induces deformation of the absorbent core 11a. The deformation inducing portions S of this embodiment are grooves that are not cut through the thickness direction and are thinned, and are provided on the back side relative to the center CL. Fig.13 As shown in the figure, a pair of deformation inducing parts S are symmetrical about the transverse center line CC, and are straight grooves inclined from the ventral side to the dorsal side in the longitudinal direction and from the inner side to the outer side in the transverse direction. By having the deformation inducing parts S, the absorbent core 11a can be easily deformed starting from the deformation inducing parts S. However, the deformation inducing parts S can also be set to any shape and size according to the deformation of the absorbent core 11a. In addition, the deformation inducing parts S are not limited to grooves, and can also be structures that can induce deformation, such as through parts that penetrate in the thickness direction or compressed parts that are compressed in the thickness direction. In addition, the deformation inducing parts S are not necessarily required.

[0192] The top sheet 12 is a liquid-permeable sheet, for example, a hydrophilic air-through nonwoven fabric or a spunbond nonwoven fabric is used. Figures 14A to 14C In this way, both side portions in the lateral direction are folded back toward the non-skin side so as to roll up the absorbent body 11 .

[0193] On the non-skin side of the absorbent body 11, there are a back sheet 14 and a hydrophobic outer sheet 15 arranged on the non-skin side. As the back sheet 14, for example, a resin film is used, and as the outer sheet 15, for example, a flexible nonwoven fabric is used. The outer sheet 15 is arranged on the non-skin side compared to the back sheet 14, and a leakage-proof wall portion 50 is formed at a position closer to the skin side than the top sheet 12.

[0194] like Fig.11 , Fig.13 as well as Fig. 14B As shown, a pair of non-skin-side elastic members 16 are provided along the longitudinal direction at both side ends of the absorbent body 10 between the back sheet 14 and the outer sheet 15 and in the crotch portion when worn. The area in which the diaper 1 (absorbent body 10) can be stretched and contracted by the non-skin-side elastic members 16 is the elastic area 60. The crotch portion corresponds to the area between the ventral waistline portion 30 and the dorsal waistline portion 40 in the longitudinal direction of the diaper 1 in the unfolded and stretched state. In this crotch portion, the side ends of the diaper 1 are the side ends of the absorbent body 10. Specifically, as Fig.11 As shown in the figure, a pair of non-skin side elastic members 16 are elastic members that can be stretched in the longitudinal direction and are shorter than the leakage-proof wall elastic members 51 and 52 described later, and are arranged between the widest part 11MA on the ventral side and the widest part 11MB on the back side of the absorbent core 11a and across the center CL. In this embodiment, three rubber threads along the longitudinal direction are fixed between the back sheet 14 and the outer sheet 15 in an extended state using an adhesive or the like. By contraction of the non-skin side elastic members 16, it is easy to bend the shape of the absorbent core 11a, so that it is easy to make the longitudinal ends of the absorbent body 10 containing the absorbent core 11a stand up toward the skin side when wearing, and it is easy to make the longitudinal central part concave.

[0195] A pair of leakage-proof wall portions 50 are provided on both sides of the absorbent body 10 in the transverse direction along the longitudinal direction of the absorbent body 10. In this embodiment, the leakage-proof wall portions 50 are formed by the outer sheet 15 and are provided with leakage-proof wall elastic members 51 and 52. Specifically, in the transverse direction, a portion of the outer sheet 15 extends outward from both side ends of the absorbent body 11, and as shown in FIG. Figures 14A to 14C By bending toward the skin side at a plurality of locations in this manner, the leakage-barrier elastic members 51 and 52 are fixed to the exterior sheet 15 to form a pair of leakage-barrier wall portions 50 having a substantially S-shaped cross section.

[0196] The pair of leakage-proof wall portions 50 respectively include a skin-side leakage-proof wall portion 50a disposed closest to the skin side and a non-skin-side leakage-proof wall portion 50b disposed on the non-skin side compared to the skin-side leakage-proof wall portion 50a. In the skin-side leakage-proof wall portion 50a, four leakage-proof wall elastic members 51 are arranged and fixed along the longitudinal direction between the bent outer sheets 15. The four leakage-proof wall elastic members 51 are arranged to be biased toward the end portion of the outer side of the leakage-proof wall portion 50 in the transverse direction. In the non-skin-side leakage-proof wall portion 50b, two leakage-proof wall elastic members 52 are arranged and fixed along the longitudinal direction between the bent outer sheets 15. The two leakage-proof wall elastic members 52 are arranged to be biased toward the end portion of the inner side of the leakage-proof wall portion 50 in the transverse direction. When the diaper 1 is worn, based on the elasticity of the leakage-proof wall elastic members 51 and 52, the leakage-proof wall portion 50 stands up toward the skin side of the wearer and matches the crotch of the wearer.

[0197] like Fig.13 As shown in the figure, at both ends of the absorbent body 10, at each end of the ventral side and the dorsal side in the longitudinal direction of the diaper 1, there are end fixing parts 53 for fixing the leakage-proof wall 50 in a manner that cannot stand up. Each end fixing part 53 has: a fixing part that fixes at least a part of the skin-side leakage-proof wall 50a and the non-skin-side leakage-proof wall 50b facing each other by adhesive or the like; and a fixing part that fixes at least a part of the non-skin-side leakage-proof wall 50b and the top sheet 12 facing each other by adhesive or the like. In the longitudinal direction of the absorbent body 10, the part of the outer sheet 15 between the end fixing parts 53 becomes a part where the leakage-proof wall 50 can stand up. For example, when the wearer is in a sleeping position, even if the excrement blocked by the leakage-proof wall 50 flows forward and backward, the end fixing parts 53 at both ends in the longitudinal direction can block the excrement, and can suppress front leakage and rear leakage.

[0198] In addition, the absorbent body 10 has an intermittent fixing portion 54 for fixing the leakage-proof wall portion 50 to the top sheet 12 at a position spaced apart from the end fixing portion 53 on the ventral side and the end fixing portion 53 on the dorsal side in the longitudinal direction. Fig.14A As shown, the intermittent fixing part 54 utilizes adhesive etc. to fix the non-skin side leakage-proof wall part 50b and the top sheet 12 facing each other. By setting the intermittent fixing part 54 of the leakage-proof wall part 50, the length of the part that can stand up in the horizontal direction is shortened, thereby the sagging of the absorbent core 11 when wearing can be suppressed.

[0199] Furthermore, if Fig.13 as well as Fig. 14BAs shown in FIG. 1 , the inner end of the leakage-proof wall 50 in the lateral direction has a pinching and fixing portion 55 for joining and fixing at least a portion of the skin-side leakage-proof wall 50a and the non-skin-side leakage-proof wall 50b facing each other. Specifically, the pinching and fixing portion 55 joins a portion of the skin-side leakage-proof wall 50a and the non-skin-side leakage-proof wall 50b using an adhesive or the like. The pinching and fixing portion 55 of this embodiment is provided along the longitudinal direction (longitudinal direction) of the absorbent body 10 ( Fig.13 ). By providing the pinching and fixing part 55, it is easy to maintain the folded shape of the leakage-proof wall part 50 formed by the outer sheet 15. In the wearing state, the leakage-proof wall part 50b on the non-skin side stands up toward the skin side through the leakage-proof wall elastic member 52 of the leakage-proof wall part 50b on the non-skin side, and the leakage-proof wall part 50a on the skin side is easy to come into surface contact with the wearer's skin through the leakage-proof wall elastic member 51 arranged on the leakage-proof wall part 50a on the skin side. In addition, since the pinching and fixing part 55 is a part with high rigidity, it is easy to maintain the surface shape of the leakage-proof wall part 50a on the skin side, and it is easy to firmly and closely contact with the wearer's skin.

[0200] The above-mentioned end fixing part 53, intermittent fixing part 54 and pinching fixing part 55 are respectively formed by applying adhesive, but are not limited to this. For example, they can also be formed by press-fitting means such as embossing. In addition, the end fixing part 53, the intermittent fixing part 54 and the pinching fixing part 55 are not limited to a rectangular shape when viewed from above, and can be any shape, or can be a structure in which one or more fixing parts are arranged horizontally or vertically. As the above-mentioned non-skin side elastic member 16 and the leak-proof wall elastic member 51, 52, rubber threads are used respectively, but are not limited to this. For example, elastic members such as stretch sheets can also be used. In addition, the non-skin side elastic member 16 and the leak-proof wall elastic member 51, 52 are respectively configured with a plurality of elastic members (rubber threads), but can also be one, or can be any number of more than two.

[0201] The absorbent body 10 has a pair of compression parts E (Ea, Eb) on both sides closer to the ventral side than the center CL. The compression part E is a compression part that is compressed by applying pressure in the thickness direction from the skin side when the absorbent core 11a is covered by the core wrap sheet 11b. The pair of compression parts E includes a one-side compression part Ea located on one side in the lateral direction and an other-side compression part Eb located on the other side. The one-side compression part Ea and the other-side compression part Eb are symmetrical about the lateral center line CC. In the present embodiment, the one-side compression part Ea includes two compression parts Ea1 and Ea2 in a wavy shape that is continuous in the longitudinal direction, and the other-side compression part Eb includes two compression parts Eb1 and Eb2 in a wavy shape that is continuous in the longitudinal direction. By having a pair of compression parts E, the deformation of the absorbent core 11a is reduced, and the shape of the absorbent body 11 is easily maintained.

[0202] <About Deformation of Absorbent Core 11a>

[0203] When wearing disposable diapers and other absorbent articles, not all excrement discharged is absorbed instantly by the absorbent core (absorbent body), and sometimes part of it remains on the surface of the absorbent article. For example, when wearing, the discharged urine is temporarily blocked by the part of the absorbent article that is closer to the ventral side than the longitudinal center, and part of it is absorbed by the absorbent core that is closer to the ventral side than the longitudinal center of the absorbent article. However, there is a possibility that unabsorbed urine flows to the back side of the absorbent article, stays on the surface of the absorbent article from the lower crotch to the back side, and leaks from the lateral outside of the absorbent article. This possibility occurs not only when the wearer is standing or sitting, but is particularly likely to occur when the wearer is in a horizontal sleeping position.

[0204] In contrast, diaper 1 is as Fig.15 As shown, the portion of the absorbent core 11a that is closer to the ventral side than the center CL is lifted toward the skin side, making it easier to approach the wearer's skin, and the longitudinal end of the portion of the absorbent core 11a that is closer to the back side than the center CL is easily raised toward the skin side, and a recessed portion 11aH that is recessed toward the non-skin side is provided in the lateral central portion 11ac of the absorbent core 11a, thereby reducing the possibility of excrement leaking from the lateral outer side of the diaper 1. Fig.15 It is a figure which shows typically the shape of the absorbent core 11a when worn.

[0205] Fig.16 It is a diagram for explaining the ventral elastic region 60A and the dorsal elastic region 60B. Fig.17 yes Fig.16 Magnified view of portion K in FIG. Fig.16 The absorbent body 11 and the elastic region 60 in the absorbent body 10 are shown, and other components are omitted for representation. A pair of elastic regions 60 are respectively the ranges in which the diaper 1 (absorbent body 10) can be stretched and contracted by the non-skin side elastic member 16. Specifically, the elastic region 60 located on one side in the lateral direction is an area surrounded by the outer end (end on one side) of the non-skin side elastic member 16 located on the outermost side (one side) in the lateral direction, the inner end (end on the other side) of the non-skin side elastic member 16 located on the innermost side (the other side) in the lateral direction, and the ventral end and the dorsal end of the effective length portion. The so-called effective length portion refers to the portion where the non-skin side elastic member 16 is fixed to the back sheet 14 or the outer sheet 15 in an extended state, and is at least the portion that gives stretchability to the back sheet 14 or the outer sheet 15. The pair of elastic regions 60 of the present embodiment are respectively rectangular regions.

[0206] like Fig.18As shown, the absorbent core 11a in the worn state is subjected to a force from the outside to the inside in the longitudinal direction due to the contraction of the elastic region 60 and a force from the outside to the inside in the transverse direction due to the legs of the wearer. Fig.18 Schematic diagram of the force applied to the diaper 1 when the wearer is wearing the diaper 1. In addition, when the wearer is wearing the diaper 1, the force generated by the elastic region 60 and the force generated by the wearer's legs are applied to the crotch portion (absorbent body 10). Fig.18 It acts on the absorbent core 11a as shown.

[0207] Figures 19A to 19C This is a diagram for explaining deformation of the absorbent body 10 . Fig.19A This is a diagram for explaining a state in which no force is applied to the absorbent body 10 . Fig.19B It is a diagram for explaining a state in which the contraction force of the elastic region 60 is applied. Fig.19C This is a diagram for explaining a state in which the force generated by the wearer's legs and the contraction force of the elastic region 60 are applied to the absorbent body 10 . Figures 19A to 19C It is a schematic diagram, which shows the components in the absorbent body 10 in a simplified manner.

[0208] When wearing, Fig.19A As shown, no lateral force is applied from the wearer's legs. Fig.19B As shown in the figure, the absorbent body 10 (absorbent body 11) can be easily contracted in the longitudinal direction by contracting the pair of elastic regions 60 along the longitudinal direction that can be stretched and contracted in the longitudinal direction provided in the diaper 1 (absorbent body 10). When the absorbent body 10 is viewed from the side, it is easy to deform into a substantially U-shape, and the transverse ends can be easily pulled up toward the skin side by contracting the non-skin side elastic members 16 provided at both side ends of the absorbent body 10. The pair of non-skin side elastic members 16 along the longitudinal direction that can be stretched and contracted in the longitudinal direction provided at both side ends of the diaper 1 (absorbent body 10) can be bent in a manner that the longitudinal central portion protrudes toward the non-skin side, or the transverse ends can be pulled up toward the skin side, or the absorbent body 10 itself can be lifted up toward the skin side.

[0209] And, if Fig.19C As shown in FIG. 1 , if a force is applied from the wearer's leg from the outside to the inside in the lateral direction, as shown in FIG. Fig.19CAs shown in the figure, the longitudinal force generated by the elastic region 60 and the lateral force generated by the wearer's legs interact with each other, and the force is likely to act toward the skin side (upper side) in the thickness direction and the inner side in the lateral direction. The central part 10c of the absorbent body 10 is recessed toward the non-skin side, and the lateral end (also called "side end") 10e of the absorbent body 10 is raised toward the skin side. In addition, since the force relative to the absorbent body 10 is also applied to the absorbent core 11a, as shown in FIG. Fig.15 As shown, the central portion 11ac in the lateral direction of the absorbent core 11a is recessed toward the non-skin side, and both side ends 11ae of the absorbent core 11a are raised toward the skin side, thereby providing recessed portions 11aH.

[0210] The diaper 1 is provided with a pair of non-skin side elastic members 16 along the longitudinal direction at the both sides of the diaper 1 and at the crotch portion when worn, at the non-skin side position of the absorbent core 11a. The non-skin side elastic members 16 form a pair of elastic regions 60 at the crotch portion when worn and at both sides of the diaper 1. The pair of elastic regions 60 are at least partially located at the back side of the center in the longitudinal direction at the crotch portion when worn, and are provided at both side ends of the diaper 1. Regarding a pair of elastic regions 60 of the diaper 1 in the unfolded and stretched state, when the portion of the elastic region 60 that is closer to the ventral side than the center C60 in the longitudinal direction is set as the ventral elastic region 60A, and the portion of the elastic region 60 that is closer to the dorsal side than the center C60 in the longitudinal direction is set as the dorsal elastic region 60B, for the diaper 1, the value obtained by dividing the weight of the absorbent core 11a overlapping with the dorsal elastic region 60B in the thickness direction by the area of ​​the dorsal elastic region 60B is greater than the value obtained by dividing the weight of the absorbent core 11a overlapping with the ventral elastic region 60A in the thickness direction by the area of ​​the ventral elastic region 60A.

[0211] Thus, in the diaper 1, compared with the case where the value obtained by dividing the weight of the absorbent core 11a overlapping the back elastic region 60B in the thickness direction by the area of ​​the back elastic region 60B is smaller than the value obtained by dividing the weight of the absorbent core 11a overlapping the ventral elastic region 60A in the thickness direction by the area of ​​the ventral elastic region 60A, it is easy to form a recessed portion 11aH (see FIG. 1 ) in the absorbent core 11a located in the crotch portion, which is closer to the back side than the center CL in the longitudinal direction of the diaper 1, due to the contraction force of the elastic region 60. Fig.15That is, the ventral elastic region 60A is set to a value obtained by dividing the weight of the absorbent core 11a overlapping the ventral elastic region 60A in the thickness direction by the area of ​​the ventral elastic region 60A to be smaller than the weight of the absorbent core 11a overlapping the dorsal elastic region 60B in the thickness direction divided by the area of ​​the dorsal elastic region 60B, so that the diaper 1 (absorbent body 10) can be easily contracted in the longitudinal direction compared with the dorsal elastic region B, and the portion closer to the dorsal side than the ventral elastic region 60A can be easily pulled toward the ventral side. On the other hand, the dorsal elastic region 60B is set to a value obtained by dividing the weight of the absorbent core 11a overlapping the dorsal elastic region 60B in the thickness direction by the area of ​​the dorsal elastic region 60B to be larger than the weight of the absorbent core 11a overlapping the ventral elastic region 60A in the thickness direction divided by the area of ​​the ventral elastic region 60A, so that the force generated by the contraction of the dorsal elastic region 60B can easily lift the absorbent core 11a toward the skin side. Thereby, the recessed part 11aH is easily formed in the part on the back side rather than the center CL of the absorptive core 11a.

[0212] like Fig. 20A As shown, if the absorbent core 11a has the recessed portion 11aH, excrement is easily accumulated in the recessed portion 11aH when the wearer is wearing the absorbent core 11a. Fig. 20A 1 is a diagram for explaining the accumulation of excrement in a normal wearing state. The so-called normal wearing state refers to the wearing state in which the wearer's pelvis is kept roughly parallel to the ground, such as in a sitting state or a standing state. Fig. 20A As shown in the figure, by accumulating excrement in the recessed portion 11aH, the side end portion of the absorbent core 11a is more likely to prevent excrement from leaking outward in the lateral direction of the diaper 1 than in the case where the recessed portion 11aH is not provided. Therefore, when the diaper is worn, even if excrement flows from the ventral side to the back side and flows along the portion on the back side relative to the center CL, the recessed portion 11aH provided on the back side relative to the center CL can easily retain the excrement or prevent the excrement from leaking outward in the lateral direction of the excrement.

[0213] In addition, if Fig. 20B As shown, even when the wearer's pelvis is tilted relative to the ground, such as when the wearer sleeps in a sideways position, the side ends of the absorbent core 11a can easily prevent excrement from leaking outward in the lateral direction of the diaper 1. Fig. 20B This is a diagram for explaining the accumulation of excrement in the tilted wearing state. Thus, even when the wearer of the diaper 1 is in a horizontal sleeping position, excrement is easily retained in the recessed portion 11aH, and the side end portion of the back side of the absorbent core 11a blocks the excrement, thereby reducing the possibility of excrement leaking outward in the lateral direction of the back side of the diaper 1.

[0214] The diaper 1 of this embodiment is as follows Fig.17As shown in the figure, the area of ​​the back elastic region 60B is larger than that of the ventral elastic region 60A. In addition, since the absorbent core 11a has a narrowing portion, when the diaper 1 is viewed in the thickness direction, the area of ​​the absorbent core 11a overlapping the back elastic region 60B relative to the area of ​​the back elastic region 60B is significantly larger than the area of ​​the absorbent core 11a overlapping the ventral elastic region 60A relative to the area of ​​the ventral elastic region 60A. As described above, the absorbent core 11a is substantially uniformly arranged with liquid-absorbent fibers and SAP throughout the entire area, and the basis weight of the absorbent core 11a is substantially constant throughout the entire area. Therefore, it is clear by visual observation that the value obtained by dividing the weight of the absorbent core 11a in the back elastic region 60B when viewed in the thickness direction by the area of ​​the back elastic region 60B is larger than the value obtained by dividing the weight of the absorbent core 11a in the ventral elastic region 60A when viewed in the thickness direction by the area of ​​the ventral elastic region 60A.

[0215] In addition, "the value obtained by dividing the weight of the absorbent core 11a in the back elastic region 60B when viewed in the thickness direction by the area of ​​the back elastic region 60B" can be calculated by a well-known method such as visual comparison. For example, it can also be obtained in the following manner: First, the back elastic region 60B is cut out from the diaper 1 (absorbent body 10) and the area of ​​the back elastic region 60B is measured. Then, the absorbent core 11a is taken out from the cut back elastic region 60B, the weight of the taken out absorbent core 11a is measured, and the measured weight of the absorbent core 11a is divided by the measured area of ​​the back elastic region 60B. The same is true for "the value obtained by dividing the weight of the absorbent core 11a in the ventral elastic region 60A when viewed in the thickness direction by the area of ​​the ventral elastic region 60A".

[0216] In addition, the deformation of the absorbent core 11a caused by the elastic region 60 exists in the following situations: when viewed in the thickness direction, the absorbent core 11a is deformed by the contraction of the elastic region 60 overlapping with the absorbent core 11a; and when viewed in the thickness direction, even in the case of not overlapping with the absorbent core 11a, the components of the absorbent body 10 such as the core covering sheet 11b are deformed by the contraction of the elastic region 60 overlapping with the components of the absorbent body 10 such as the core covering sheet 11b, and the absorbent core 11a is deformed accordingly.

[0217] In addition, in the present embodiment, the basis weight of the absorbent core 11a is set to be substantially constant throughout the entire area, and the area of ​​the absorbent core 11a overlapping with the dorsal elastic region 60B relative to the area of ​​the dorsal elastic region 60B is set to be larger than the area of ​​the absorbent core 11a overlapping with the ventral elastic region 60A relative to the area of ​​the ventral elastic region 60A. As a result, the value obtained by dividing the weight of the absorbent core 11a overlapping with the dorsal elastic region 60B in the thickness direction by the area of ​​the dorsal elastic region 60B is larger than the value obtained by dividing the weight of the absorbent core 11a overlapping with the ventral elastic region 60A by the area of ​​the ventral elastic region 60A, but the present invention is not limited to this. For example, in a case where the area of ​​the absorbent core 11a overlapping with the ventral elastic region 60A relative to the area of ​​the ventral elastic region 60A and the area of ​​the absorbent core 11a overlapping with the dorsal elastic region 60B relative to the area of ​​the dorsal elastic region 60B are the same, the basis weight of the absorbent core 11a overlapping with the dorsal elastic region 60B when viewed in the thickness direction may be set larger than the basis weight of the absorbent core 11a overlapping with the ventral elastic region 60A.

[0218] Preferably, the transverse length W60 of the elastic region 60 is greater than the length T16 of the non-skin side elastic member 16 of the pair of elastic regions 60 in the thickness direction (T16<W60). In the diaper 1, the length T16 of the non-skin side elastic member 16 in the thickness direction is the thickness (diameter) of the rubber thread, and for example, a rubber thread with a thickness (T16) of less than 5 mm is used. The transverse length W60 of the elastic region 60 is the length between the outer end of the non-skin side elastic member 16 located at the transverse outermost position among the three non-skin side elastic members 16 and the inner end of the non-skin side elastic member 16 located at the transverse innermost position, and in the diaper 1, the length W60 is set to 12 mm.

[0219] If the elastic region 60 contracts locally, the absorbent core 11a may form deep wrinkles locally, and there is a possibility that it is difficult to deform into a desired shape. In contrast, by setting the transverse length W60 of the elastic region 60 to be longer than the thickness direction length T16 of the non-skin side elastic member 16, the possibility of the non-skin side elastic member 16 of the elastic region 60 contracting locally is reduced, and the elastic region 60 is easy to apply a contraction force in a planar manner to the absorbent core 11a, which is easy to promote the deformation of the absorbent core 11a.

[0220] Regarding the elastic region 60, it is preferred that Fig.16As shown in the figure, in the diaper 1 in the unfolded and stretched state, the longitudinal length L60 of the pair of elastic regions 60 is longer than 1 / 8 of the longitudinal length L11a of the absorbent core 11a and shorter than 1 / 2. In addition, it is preferred that the longitudinal length L60 of the pair of elastic regions 60 is longer than 1 / 5 of the longitudinal length L11a of the absorbent core 11a and shorter than 1 / 4. By setting the elastic region 60 to such a length, the contraction force of the elastic region 60 at the position of the desired recessed portion 11aH in the absorbent core 11a can be exerted, and on the other hand, the possibility of excessive contraction of the absorbent core 11a in the longitudinal direction can be reduced.

[0221] Preferably, from the natural state, the force that causes the outer ends of each pair of elastic regions 60 to be stretched longitudinally per unit length is greater than the force that causes the inner ends of each pair of elastic regions to be stretched longitudinally per unit length. As a result, since the outer portions of the elastic regions 60 are more likely to shrink than the inner portions in the transverse direction, the outer portions of the crotch portion (absorbent core 11a) of the diaper 1 in the transverse direction are more likely to bulge toward the skin side than the inner portions, and the inner portions (central portions) of the diaper 1 in the transverse direction are more likely to be sunken toward the non-skin side, and thus, the sunken portion Ha is more likely to be formed in the absorbent core 11a. In particular, when the contraction force (force per unit length of extension) of the non-skin side elastic member 16 on the transverse outer side and the non-skin side elastic member 16 on the transverse inner side of a pair of elastic regions 60 is approximately the same, if the force for extending the transverse outer ends of each pair of elastic regions 60 by a unit length in the longitudinal direction is set to be greater than the force for extending the transverse inner ends of each pair of elastic regions by a unit length in the longitudinal direction, the rigidity of the transverse outer ends of the crotch portion (absorbent core 11a) of the diaper 1 is lower than that of the transverse inner ends, and thus, it is easy for the transverse outer portion of the crotch portion (absorbent core 11a) of the diaper 1 to bulge toward the skin side compared with the transverse inner portion, and it is easy for the transverse central portion of the diaper 1 to be recessed toward the non-skin side, and thus, it is easy to form a recessed portion Ha in the absorbent core 11a.

[0222] In the diaper 1 of the present embodiment, the elastic regions 60 are provided with a plurality of non-skin side elastic members 16. For example, in the elastic region 60 on one side in the transverse direction in a natural state, the force causing the portion provided with the transversely outermost (one side) non-skin side elastic member 16 to stretch per unit length in the longitudinal direction is greater than the force causing the portion provided with the transversely innermost (the other side) non-skin side elastic member 16 to stretch per unit length in the longitudinal direction.

[0223] The comparison of the "force per unit length of extension" of each part can be carried out by a well-known method. For example, all or part of the transverse outer end of the elastic region 60 provided on one side in the transverse direction (the part with the non-skin side elastic member 16 closest to one side in the transverse direction) and the transverse inner end of the elastic region 60 provided on one side in the transverse direction (the part with the non-skin side elastic member 16 closest to the other side in the transverse direction) are cut out as samples. And the longitudinal length of each sample is measured. In addition, the chuck of the tensile tester is clamped at both ends of each sample. The chucks are separated by a unit length, and the load obtained when the sample is stretched is measured. And the value obtained by dividing the load of each sample by the longitudinal length of each sample can be compared.

[0224] As described above, the diaper 1 of the present embodiment is a panty-type absorbent article formed into a panty type by joining a pair of side portions 30sw of the ventral waist portion 30 and a pair of side portions 40sw of the dorsal waist portion 40 by the side joining portions 20. The ventral waist portion 30 of the diaper 1 has a ventral waist elastic member 35 as a ventral elastic member that stretches in the lateral direction, and the dorsal waist portion 40 has a dorsal waist elastic member 45 as a dorsal elastic member that stretches in the lateral direction and an end elastic portion 47a.

[0225] In such a panty-type absorbent article, it is preferred that Fig.11 As shown in the figure, in the unfolded and stretched state of the diaper 1, the pair of elastic regions 60 are respectively arranged on the dorsal side relative to the side joints 20 of the ventral waist portion 30, and are respectively arranged on the ventral side relative to the side joints 20 of the dorsal waist portion 40. More preferably, in the longitudinal direction of the unfolded and stretched state of the diaper 1, the pair of elastic regions 60 are respectively arranged on the dorsal side relative to the ventral elastic member located most dorsally, and are respectively arranged on the ventral side relative to the dorsal elastic member located most ventrally. In the diaper 1 of this embodiment, the pair of elastic regions 60 are arranged on the dorsal side relative to the ventral waist elastic member 35e located most dorsally among the ventral elastic members (ventral waist elastic members 35), and are arranged on the ventral side relative to the end elastic portion 47ae located most ventrally among the dorsal elastic members (dorsal waist elastic members 45 and end elastic portions 47a). In addition, in the diaper 1 of the present embodiment, in the longitudinal direction of the unfolded and stretched diaper 1, a pair of elastic regions 60 are provided between the end portion on the center CL side of the ventral waistline portion 30 and the end portion on the center CL side of the dorsal waistline portion 40. When such a diaper 1 is worn, the contraction effect due to the elastic regions 60 is easily applied to a position corresponding to the crotch portion in the worn state, and thus, a recessed portion aH is easily formed in the crotch portion of the absorbent core 11a.

[0226] In addition, it is preferred that Fig.11As shown in FIG. 1 , the longitudinal distance Lbe from the end 60be of the back side of each of the pair of elastic regions 60 to the end of the back side of the back elastic member (end elastic portion 47ae) located at the most ventral position is smaller than the longitudinal distance Lae from the end 60ae of the ventral side of each of the pair of elastic regions 60 to the end of the back side of the ventral elastic member (ventral waist elastic member 35e) located at the most dorsal position (Lae>Lbe). Thus, compared with the case where the distance Lbe is greater than the distance Lae, it is easier to pull the back side of the absorbent core 11a by the back elastic member (end elastic portion 47a) so that it can be brought into contact with the wearer's skin. By bringing the end of the back side of the absorbent core 11a into contact with the wearer's skin, the possibility of excrement leaking from the back side of the diaper 1 to the outside can be reduced. In particular, when the wearer is in a horizontal sleeping position, the possibility of leaking from the outside of the back side of the diaper 1 can be reduced.

[0227] Preferably, the pair of elastic regions 60 are respectively provided across the center CL in the longitudinal direction of the diaper 1. Since the pair of elastic regions 60 spans the center CL, if the portion of the elastic region 60 located on the ventral side of the center CL contracts in the longitudinal direction, the vicinity of the center CL of the diaper 1 can be easily contracted in the longitudinal direction, and the portion of the elastic region 60 located on the back side of the center CL can be easily contracted, so that the absorbent core 11a on the back side of the center CL can be easily bulged toward the skin side, and the concave portion 11aH in which the central portion of the absorbent core 11a in the lateral direction protrudes toward the non-skin side can be easily formed on the back side of the center CL, thereby reducing the possibility of excrement leaking from the outer side of the diaper 1 in the lateral direction.

[0228] Furthermore, it is more preferred that Fig.17 As shown in FIG. 1 and FIG. 2 , the longitudinal center C60 of each pair of elastic regions 60 is disposed on the back side relative to the longitudinal center CL of the diaper 1. That is, the elastic region 60 is disposed closer to the back side than the center CL. Thus, when the wearer wears the diaper, the deformation of the absorbent core 11a at a position corresponding to the portion from the crotch to the back side is easily promoted, and the concave portion 11aH is easily formed in the portion from the crotch to the back side. Furthermore, even when the wearer is in a horizontal sleeping position, the possibility of excrement leaking from the lateral outer side of the diaper 1 is easily reduced.

[0229] In addition, if Fig.16As shown in the figure, in the lateral direction, the shortest distance from the narrowest portion 11N of the absorbent core 11 having the shortest lateral length to the center of each of the pair of elastic regions 60 in the lateral direction is Wn, and the shortest distance from the back widest portion 11MB of the absorbent core 11a having the longest lateral length located at the rear side of the center CL in the longitudinal direction of the diaper 1 to the center of each of the pair of elastic regions 60 in the lateral direction is Wm. Specifically, the shortest distance Wn refers to the distance from the end of one side of the narrowest portion 11N of the absorbent core 11a in the lateral direction to the center of the elastic region 60 in the lateral direction on one side of the lateral direction, and the shortest distance Wm refers to the distance from the end of one side of the back widest portion 11MB of the absorbent core 11a in the lateral direction to the center of the elastic region 60 in the lateral direction on one side of the lateral direction. Preferably, the shortest distance Wn is smaller than the shortest distance Wm (Wn<Wm). That is, the elastic region 60 is provided at a position closer to the lateral outer end of the narrowest portion 11N than the lateral outer end of the back-side widest portion 11MB in the lateral direction.

[0230] Due to the contraction force of the elastic region 60, when viewed in the thickness direction, the absorbent core 11a can lift the area from the end portion of the elastic region 60 on the inner side in the lateral direction to the widest part 11MB on the back side of the absorbent core 11a toward the skin side. Therefore, in the lateral direction, the closer the elastic region 60 is to the outer end of the narrowest part 11N in the lateral direction, the longer the lateral length of the side end 11ae that can be lifted toward the skin side can be. By making the shortest distance Wn shorter than the shortest distance Wm, it is easy to set the height of the side end 11ae of the absorbent core 11 that is lifted toward the skin side when the recessed part 11aH is formed to a high level in the wearing state, and the side end 11ae is easy to block excrement, which can further reduce the possibility of excrement leaking from the lateral outer side of the diaper 1.

[0231] In addition, the closer the elastic region 60 is to the lateral outer end of the narrowest portion 11N in the lateral direction, the higher the side end portion 11ae can be formed. As in the diaper 1 of this embodiment, it is preferred that each elastic region 60 is arranged on the outside relative to the narrowest portion 11N of the absorbent core 11a in the lateral direction.

[0232] In addition, regarding the absorbent core 11a, it is preferred that Fig.16As shown in the figure, in the longitudinal direction, the area of ​​the absorbent core 11a located at the back side of the center C60 of the pair of elastic regions 60 is made larger than the area of ​​the absorbent core 11a located at the ventral side of the center C60 of the pair of elastic regions 60. The larger the area of ​​the absorbent core 11a, the easier it is to form the recessed portion 11aH of the absorbent core 11a. Therefore, compared with the case where the area of ​​the absorbent core 11a located at the back side of the center C60 is smaller than the area of ​​the absorbent core located at the ventral side of the center C60, it is easy to provide the recessed portion 11aH in a large area of ​​the back side of the absorbent core 11a so that the two sides of the absorbent core 11a swell toward the skin side and the lateral central portion of the absorbent core 11a protrudes toward the non-skin side. By the recessed portion 11aH provided on the back side, the possibility of excrement leaking from the lateral outer side of the back side of the diaper 1 can be reduced, especially in the state of the sleeping posture.

[0233] As described above, in the diaper 1, the absorbent body 10 having the absorbent core 11a has a pair of leakproof wall portions 50 having leakproof wall elastic members 51 along the longitudinal direction at both ends in the lateral direction. Preferably, the force for extending the pair of elastic regions 60 by a unit length in the longitudinal direction is lower than the force for extending the pair of leakproof wall portions 50 by a unit length in the longitudinal direction. The leakproof wall portion 50 is arranged on the skin side relative to the absorbent core 11a, and the non-skin side elastic member 16 is arranged on the non-skin side relative to the absorbent core 11a. Thus, the possibility that the absorbent core 11a excessively contacts the skin due to the shrinkage at the elastic region 60 causing the absorbent core 11a to be deformed to a degree exceeding the leakproof wall portion 50 can be reduced. In addition, the comparison of the "force for extending the elastic region 60 by a unit length" and the "force for extending the leakproof wall portion 50 by a unit length" can be performed by a well-known method in the same manner as the above-mentioned method.

[0234] like Fig.17 As shown, when viewed in the thickness direction, the elastic region 60 on one side of the transverse direction may also have an overlapping portion P overlapping with the absorbent core 11a, and the area of ​​the overlapping portion P on one side of the transverse direction is more than half of the area of ​​the elastic region 60 on one side of the transverse direction. Fig.17 In the figure, the overlapping portion P is indicated by the oblique line portion obliquely downward on the left. When viewed in the thickness direction, the portion of the absorbent core 11a overlapping the elastic region 60 is easily deformed by the contraction of the elastic region 60, so that the two side portions of the absorbent core 11a are easily and directly raised toward the skin side, forming a recessed portion 11aH that makes the lateral central portion of the absorbent core 11a protrude toward the non-skin side.

[0235] like Fig.17As shown, when viewed in the thickness direction, the elastic region 60 on one side of the transverse direction may also have a non-overlapping portion U that does not overlap with the absorbent core 11a, and the area of ​​the non-overlapping portion U on one side of the transverse direction is more than half of the area of ​​the elastic region 60 on one side of the transverse direction. Fig.17 In the figure, the non-overlapping portion U is the area in the elastic region 60 that is not indicated by the diagonal lines. The absorbent core 11a in the diaper 1 is a portion with relatively high rigidity. On the other hand, the non-overlapping portion U that does not overlap with the elastic region 60 and the absorbent core 11a is a portion with relatively low rigidity than the overlapping portion P. Therefore, by setting the area of ​​the non-overlapping portion U to be more than half of the area of ​​the elastic region 60, in the wearing state, first, the two side portions of each component such as the core wrap sheet 11b or the back sheet 14 of the diaper 1 (absorbent body 10) at the crotch portion are bulged toward the skin side by contraction of the elastic region 60, and the deformation of the absorbent core 11a adjacent to the non-overlapping portion U can be promoted in conjunction with the bulging of each component.

[0236] The diaper 1 of this embodiment makes it easy to deform the absorbent core 11a in a balanced manner by setting the area of ​​the overlapping portion P and the area of ​​the non-overlapping portion U to be substantially the same.

[0237] ===Other embodiments of the second embodiment===

[0238] Above, the embodiments of the present invention have been described, but the above embodiments are intended to facilitate the understanding of the present invention and are not intended to be restrictive interpretations of the present invention. In addition, the present invention may be changed or improved without departing from its concept, and the present invention certainly includes equivalent configurations.

[0239] In the above-mentioned embodiment, a so-called three-part panty diaper having an absorbent body 10, a ventral waistline portion 30, and a dorsal waistline portion 40 is exemplified, but it is not limited thereto. For example, a so-called two-part diaper having an outer body and an absorbent body in which the ventral waistline portion and the dorsal waistline portion are continuous and formed into one body may also be used. For example, in a so-called two-part panty diaper (a diaper consisting of an outer body and an absorbent body), in the longitudinal direction, the area overlapping with the side joint portion is set as the waistline portion (ventral waistline portion, dorsal waistline portion). In this two-part diaper, an elastic member is sometimes arranged in an area exceeding the ventral waistline portion or the dorsal waistline portion. With respect to such an elastic member, in the unfolded and stretched diaper, when the length of the portion arranged on the dorsal side compared to the center in the longitudinal direction is greater than the length of the portion arranged on the ventral side compared to the center in the longitudinal direction, it is set as the dorsal elastic member of the dorsal waistline portion.

[0240] In the above-mentioned embodiment, the elastic region 60 is a stretchable region formed by the non-skin side elastic member 16 composed of a plurality of (three) rubber threads, but the present invention is not limited thereto. The elastic region 60 may also use an elastic member such as a stretch sheet, or may combine a plurality of members such as rubber threads or stretch sheets to achieve stretching. In addition, the elastic region 60 may also be formed by stretching a single elastic member.

[0241] In the diaper 1 of the above-mentioned embodiment, the pair of elastic regions 60 are respectively provided at the back side of the side joints 20 of the front waist portion 30 and the front side of the side joints 20 of the back waist portion 40, and at the back side of the front elastic member (front waist elastic member 35e) located at the most back side and at the front side of the back elastic member (end elastic member 47ae) located at the most back side, but the present invention is not limited thereto. At least a part of the pair of elastic regions 60 may be provided at a position overlapping with the side joints 20 in the longitudinal direction. In addition, at least a part of the pair of elastic regions 60 may be provided at a position overlapping with the front elastic member (front waist elastic member 35e) located at the most back side, and may be provided at a position overlapping with the back elastic member (end elastic member 47ae) located at the most back side. In addition, even in such a case, it can be a so-called three-component type disposable diaper having a ventral waist portion 30, a dorsal waist portion 40 and an absorbent body 10 as separate components, or it can be a so-called two-component type disposable diaper having an outer body and an absorbent body (absorbent body) that are continuous and integrated with the ventral waist portion and the dorsal waist portion.

[0242] In the above-mentioned embodiment, the back waist circumference portion 40 has a curved elastic member 47 which is continuous in the order of the inclined elastic portion 47b, the end elastic portion 47a, and the inclined elastic portion 47b in the transverse direction, but the present invention is not limited thereto. The inclined elastic portion 47b and the end elastic portion 47a may also be discontinuous. In addition, the back waist circumference portion 40 may also be a configuration having only one of the end elastic portion 47a and the inclined elastic portion 47b, or may be a configuration not having both the end elastic portion 47a and the inclined elastic portion 47b. Furthermore, the end elastic portion 47a and the inclined elastic portion 47b may also be partially cut off.

[0243] In the above-described embodiment, each elastic region 60 is provided outside the narrowest portion 11N of the absorbent core 11a in the lateral direction, but the present invention is not limited thereto. The elastic region 60 may overlap the narrowest portion 11N in the lateral direction.

[0244] In addition, the diaper 1 is an underpants-type absorbent article formed by joining a pair of side portions 30sw of the ventral waist portion 30 and a pair of side portions 40sw of the dorsal waist portion 40 using the side joining portions 20, wherein it can also be arranged as follows: when the dorsal waist portion 40 has a dorsal elastic member that can be stretched and contracted in the transverse direction and is arranged on the ventral side compared with the side joining portions 20 of the dorsal waist portion 40 and is arranged on the dorsal side compared with the ventral waist portion 30, when the diaper 1 is viewed in the thickness direction, at least a portion of the dorsal elastic member is located at a position closer to the ventral side than the center C60 of each of the pair of elastic regions 60 in the longitudinal direction, and has a portion overlapping with the absorbent core 11a. That is, in the unfolded and stretched state, with respect to the back waist portion 40 having a back elastic member provided between the side joints 20 of the ventral waist portion 30 and the side joints 40 of the back waist portion 40, the ventral end in the longitudinal direction is provided at a position closer to the ventral side than the center CL. When the back waist portion 40 is provided to be larger than the back waist portion 40 of the above-mentioned embodiment, it can also be provided that: when viewed in the thickness direction, the back elastic member is provided at a position closer to the ventral side than the center C60 in the longitudinal direction of a pair of elastic regions 60, and the back elastic member has a portion overlapping with the absorbent core 11a.

[0245] The back elastic member in this case can be arranged at a position closer to the wearer's urination opening when worn, compared with the diaper 1 of the above-mentioned embodiment. Therefore, when worn, a concave portion 11aH is formed in the crotch portion, which makes the two side portions of the absorbent core 11a bulge toward the skin side and makes the lateral central portion protrude toward the non-skin side, and the absorbent core 11a is easily brought into close contact with the wearer's skin in the portion close to the urination opening by the back elastic member of the back waistline portion 40, so that urine can be easily absorbed.

[0246] Description of Reference Numerals

[0247] 1. Diapers (underwear type absorbent articles, absorbent articles),

[0248] 10 absorbent body,

[0249] 11 absorber,

[0250] 11a absorbent core, 11b core wrapping sheet,

[0251] 11MA ventral wide part, 11MB dorsal wide part (wide part),

[0252] 12 Top sheet,

[0253] 14 back piece,

[0254] 15 outer film,

[0255] 16 non-skin side elastic member (elastic member),

[0256] 20 lateral joint (joint),

[0257] 30 ventral waist, 30 sw side (side end),

[0258] 31 skin side pieces,

[0259] 32 Non-skin side panels,

[0260] 35 ventral waist elastic member (ventral elastic member),

[0261] 36 skin patches,

[0262] 40 back waist, 40b hip area, 40sw side (side end),

[0263] 41 skin side piece,

[0264] 42 Non-skin side panels,

[0265] 45 back waist elastic member (back elastic member),

[0266] 46 skin patches,

[0267] 47 a curved elastic member (back elastic member),

[0268] 47a end elastic part (crotch side elastic part, back side elastic member),

[0269] 47b: inclined elastic portion (back elastic member),

[0270] 50 leakage-proof wall portion, 50a skin-side leakage-proof wall portion, 50b non-skin-side leakage-proof wall portion,

[0271] 51 leak-proof wall elastic member, 52 leak-proof wall elastic member,

[0272] 53 end fixing part, 54 intermittent fixing part, 55 pinching fixing part,

[0273] 60 elastic area,

[0274] 60A ventral elastic area,

[0275] 60B Dorsal elastic area,

[0276] BH waist opening, LH leg opening,

[0277] E compression part, Ea compression part on one side, Eb compression part on the other side,

[0278] S deformation inducing part.

Claims

1. A pant-type absorbent article having longitudinal, transverse and thickness directions intersecting each other, The above-mentioned underpants-type absorbent article comprises a ventral waistline portion, a dorsal waistline portion and a liquid-absorbent absorbent core. The underwear is formed by joining a pair of side ends of the ventral waistline portion and a pair of side ends of the dorsal waistline portion, and is characterized in that: In the unfolded and extended state, The above-mentioned underpants-type absorbent article comprises a pair of elastic members along the above-mentioned longitudinal direction, The pair of elastic members are respectively arranged at the crotch portion when worn and at both side ends of the pant-type absorbent article. When a position that is 1 / 2 of the distance from the end portion of the longitudinal center side of the joining portion in the back waistline portion to the longitudinal center of the underpants-type absorbent article is set as a reference position, The transverse length of the absorbent core at the reference position is greater than the transverse length of the absorbent core at the longitudinal center of the panty-type absorbent article. A value obtained by dividing the length in the longitudinal direction from the reference position to the end portion on the back side of the absorbent core by the length in the longitudinal direction of the absorbent core is 30% or more.

2. The underpants-type absorbent article according to claim 1, wherein: The area of ​​the absorbent core located on the back side relative to the center in the longitudinal direction of the pull-on absorbent article is larger than the area of ​​the absorbent core located on the front side relative to the center in the longitudinal direction of the pull-on absorbent article.

3. The underpants-type absorbent article according to claim 1 or 2, wherein: The back waist portion includes a back waist elastic member along the transverse direction. The absorbent core is provided on the skin side relative to the back waistline portion. When viewed in the thickness direction, the absorbent core and the back waist elastic member have a portion overlapping each other at a position closer to the back side than the reference position in the longitudinal direction.

4. The underpants-type absorbent article according to claim 1 or 2, wherein: The back waistline portion has a back elastic member. The back elastic member has: a pair of inclined elastic portions, the pair of inclined elastic portions being located at both side ends in the lateral direction and closer to the center side in the longitudinal direction than the joining portion, and being inclined from the inner side to the outer side in the lateral direction and from the center side in the longitudinal direction to the back side; and The lower crotch side elastic part is along the above-mentioned transverse direction, The crotch side elastic portion is provided on the ventral side relative to the joining portion of the back waist portion in the longitudinal direction. In the longitudinal direction, at least a part of the crotch-side elastic portion is located on the ventral side relative to the end portion on the back side of the absorbent core.

5. The underpants-type absorbent article according to claim 1 or 2, wherein: The back waistline portion has a back elastic member. The back elastic member has: a pair of inclined elastic portions, the pair of inclined elastic portions being located at both side ends in the lateral direction and closer to the center side in the longitudinal direction than the joining portion, and being inclined from the inner side to the outer side in the lateral direction and from the center side in the longitudinal direction to the back side; and The lower crotch side elastic part is along the above-mentioned transverse direction, The crotch side elastic portion is provided on the ventral side relative to the joining portion of the back waist portion in the longitudinal direction. In the longitudinal direction, the transverse length of the absorbent core at the end of the longitudinal center side of the elastic portion on the crotch side is greater than the transverse length of the absorbent core at the longitudinal center of the underwear-type absorbent article, and is less than the transverse length of the absorbent core at the reference position.

6. The underpants-type absorbent article according to claim 1 or 2, wherein: The back waistline portion has a pair of inclined elastic portions at both end portions in the transverse direction and closer to the center side in the longitudinal direction than the joining portion, and the pair of inclined elastic portions are inclined from the inner side to the outer side in the transverse direction and from the center side in the longitudinal direction to the back side, respectively. In the longitudinal direction, at least a portion of the inclined elastic portion is provided on the rear side relative to the reference position.

7. The underpants-type absorbent article according to claim 1 or 2, wherein: The absorbent core has a pair of deformation inducing parts. The pair of deformation inducing portions are inclined from the ventral side in the longitudinal direction toward the dorsal side and from the inner side in the lateral direction toward the outer side.

8. The underpants-type absorbent article according to claim 7, wherein: The ends of the pair of deformation inducing portions on the ventral side are separated from each other.

9. The underpants-type absorbent article according to claim 7, wherein: An end portion of the deformation guiding portion on the ventral side is located on the ventral side relative to the reference position.

10. The underpants-type absorbent article according to claim 7, wherein: The above-mentioned underwear type absorbent article has an absorbent body having the above-mentioned absorbent core, The absorbent body has leakage-proof wall portions at both ends in the transverse direction, and the leakage-proof wall portions have leakage-proof wall elastic members along the longitudinal direction. In the lateral direction, the pair of deformation inducing portions are provided on the inner side than the leakage preventing wall portion.

11. The underpants-type absorbent article according to claim 7, wherein: The back waistline portion has a back elastic member. The back elastic member has: a pair of inclined elastic portions, the pair of inclined elastic portions being located at both side ends in the lateral direction and closer to the center side in the longitudinal direction than the joining portion, and being inclined from the inner side to the outer side in the lateral direction and from the center side in the longitudinal direction to the back side; and The lower crotch side elastic part is along the above-mentioned transverse direction, The crotch side elastic portion is provided on the ventral side relative to the joining portion of the back waist portion in the longitudinal direction. In the longitudinal direction, at least a portion of the crotch-side elastic portion is located on the ventral side relative to the end portions on the back side of the pair of deformation guiding portions.

12. A pant-type absorbent article having longitudinal, transverse and thickness directions intersecting each other, The above-mentioned underpants-type absorbent article comprises a ventral waistline portion, a dorsal waistline portion and a liquid-absorbent absorbent core. The underwear is formed by joining a pair of side ends of the ventral waistline portion and a pair of side ends of the dorsal waistline portion, and is characterized in that: In the unfolded and extended state, The above-mentioned underpants-type absorbent article comprises a pair of elastic members along the above-mentioned longitudinal direction, The pair of elastic members are respectively arranged at the crotch portion when worn and at both side ends of the pant-type absorbent article. The absorbent core has a wide portion at a position on the back side of the center in the longitudinal direction of the underwear-type absorbent article. A value obtained by dividing the length of the wide portion in the longitudinal direction by the length of the absorbent core in the longitudinal direction is 30% or more.

13. The underpants-type absorbent article according to claim 12, wherein: The absorbent core has a ventral wide portion located ventrally relative to the longitudinal center. The length of the wide portion in the longitudinal direction is greater than twice the length of the ventral wide portion in the longitudinal direction.

14. An absorbent article having longitudinal, transverse and thickness directions intersecting each other, The absorbent article comprises a ventral waistline portion, a dorsal waistline portion, and a liquid-absorbent absorbent core, and is characterized in that: In the unfolded and extended state, The absorbent article comprises a pair of elastic regions that can contract in the longitudinal direction, the pair of elastic regions being formed by elastic members provided on the non-skin side relative to the absorbent core, At least a part of the pair of elastic regions is located on the back side of the center in the longitudinal direction in the crotch portion when the wearer wears the absorbent article, and the pair of elastic regions are respectively provided at the two side ends of the absorbent article. Regarding the pair of elastic regions, when the portion of the pair of elastic regions closer to the ventral side than the center in the longitudinal direction is defined as the ventral elastic region, and the portion of the pair of elastic regions closer to the back side than the center in the longitudinal direction is defined as the back elastic region, The value obtained by dividing the weight of the absorbent core overlapping the back elastic region in the thickness direction by the area of ​​the back elastic region is greater than the value obtained by dividing the weight of the absorbent core overlapping the front elastic region in the thickness direction by the area of ​​the front elastic region.

15. The absorbent article according to claim 14, wherein The transverse length of the elastic region is greater than the thickness length of the elastic member.

16. The absorbent article according to claim 15, wherein The force that causes the outer side ends of each of the pair of elastic regions in the transverse direction to extend by a unit length in the longitudinal direction is greater than the force that causes the inner side ends of each of the pair of elastic regions in the transverse direction to extend by a unit length in the longitudinal direction.

17. The absorbent article according to any one of claims 14 to 16, wherein: The pair of elastic regions are respectively provided across the center of the absorbent article in the longitudinal direction.

18. The absorbent article according to any one of claims 14 to 16, wherein: The absorbent article is an underpants-type absorbent article that is formed into an underpants shape by joining a pair of side ends of the ventral waistline portion and a pair of side ends of the dorsal waistline portion by a joining portion. The pair of elastic regions are respectively provided at positions closer to the back side than the joining portion of the front waistline portion and closer to the front side than the joining portion of the back waistline portion.

19. The absorbent article according to any one of claims 14 to 16, wherein: The abdominal waistline portion has an abdominal elastic member that stretches in the transverse direction. The back waistline portion has a back elastic member that stretches in the transverse direction. In the longitudinal direction, the pair of elastic regions are respectively provided at positions closer to the dorsal side than the ventral elastic member closest to the dorsal side and closer to the ventral side than the dorsal elastic member closest to the ventral side.

20. The absorbent article according to any one of claims 14 to 16, wherein: The abdominal waistline portion has an abdominal elastic member that stretches in the transverse direction. The back waistline portion has a back elastic member that stretches in the transverse direction. The longitudinal distance from the end of the dorsal side of each of the pair of elastic regions to the end of the ventral side of the dorsal elastic component closest to the ventral side is smaller than the longitudinal distance from the end of the ventral side of each of the pair of elastic regions to the end of the dorsal side of the ventral elastic component closest to the dorsal side.

21. The absorbent article according to any one of claims 14 to 16, wherein: The absorbent article has an absorbent body having the absorbent core. The absorbent body has a pair of leakage-proof wall portions at both ends in the transverse direction, and the pair of leakage-proof wall portions have leakage-proof wall elastic members along the longitudinal direction. The force causing the pair of elastic regions to extend per unit length in the longitudinal direction is smaller than the force causing the pair of leakage-proof wall portions to extend per unit length in the longitudinal direction.

22. The absorbent article according to any one of claims 14 to 16, wherein: In the above-mentioned transverse direction, the shortest distance from the narrowest part of the above-mentioned absorbent core having the shortest transverse length to the center of each of the above-mentioned pair of elastic regions in the above-mentioned transverse direction is smaller than the shortest distance from the widest part of the above-mentioned absorbent core having the longest transverse length on the back side relative to the center in the above-mentioned longitudinal direction of the above-mentioned absorbent article to the center of each of the above-mentioned pair of elastic regions in the above-mentioned transverse direction.

23. The absorbent article according to any one of claims 14 to 16, wherein: When viewed in the thickness direction, The elastic region on one side in the lateral direction has an overlapping portion overlapping with the absorbent core. An area of ​​the overlapping portion on one side in the lateral direction is equal to or larger than a half of an area of ​​the elastic region on one side in the lateral direction.

24. The absorbent article according to any one of claims 14 to 16, wherein: When viewed in the thickness direction, The elastic region on one side in the lateral direction has a non-overlapping portion that does not overlap with the absorbent core. An area of ​​the non-overlapping portion on one side in the lateral direction is equal to or larger than a half of an area of ​​the elastic region on one side in the lateral direction.

25. The absorbent article according to any one of claims 14 to 16, wherein: In the longitudinal direction, an area of ​​the absorbent core located on the back side relative to the center of the pair of elastic regions is larger than an area of ​​the absorbent core located on the front side relative to the center of the pair of elastic regions.

26. The absorbent article according to any one of claims 14 to 16, wherein: The absorbent article is an underpants-type absorbent article that is formed into an underpants shape by joining a pair of side ends of the ventral waistline portion and a pair of side ends of the dorsal waistline portion by a joining portion. The back waistline portion has a back elastic member. The back elastic member has: a pair of inclined elastic portions, the pair of inclined elastic portions being located at both side ends in the lateral direction and closer to the center side in the longitudinal direction than the joining portion, and being inclined from the inner side to the outer side in the lateral direction and from the center side in the longitudinal direction to the back side; and The lower crotch side elastic part is along the above-mentioned transverse direction, The crotch side elastic portion is provided on the ventral side relative to the joining portion of the back waist portion in the longitudinal direction. When viewed in the thickness direction, at least a portion of the crotch-side elastic portion is located on the abdominal side relative to the center of each of the pair of elastic regions in the longitudinal direction and has a portion overlapping the absorbent core.

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