Absorbent panty-type items

Abstract

To provide a pant-type absorbent article that prevents leakage of excrement from the leg opening. [Solution] The pant-type absorbent article 1 comprises an abdominal portion 3, a dorsal portion 6, and an absorbent body 4. The abdominal portion has an abdominal waist end 101 and an abdominal crotch end 107. The dorsal portion has a dorsal waist end 102 and a dorsal crotch end 108. The dorsal portion has a dorsal extension 60 and a dorsal body portion that extend from a position corresponding to the abdominal waist end to the dorsal waist end. The abdominal portion has an abdominal extension 32 and an abdominal body portion that extend from a position corresponding to the dorsal crotch end to the abdominal crotch end. The pant-type absorbent article comprises a pair of side seals 8 to which the lateral side edge of the abdominal body portion and the lateral side edge of the dorsal body portion are joined. The dorsal extension, dorsal body portion, abdominal extension, and abdominal body portion each have one or more laterally stretchable elastic bodies 70 that extend laterally and are arranged to do so.

Description

Technical Field

[0001] The present invention relates to a pant-type absorbent article such as a disposable diaper.

Background Art

[0002] A pant-type absorbent article generally includes an absorbent main body, a ventral part, and a dorsal part. The ventral part and the dorsal part are joined by a side seal at the lateral edge in the transverse direction, thereby forming the trunk part of the pant-type absorbent article.

[0003] Patent Documents 1 and 2 describe a pant-type absorbent article that prevents leakage of excrement such as soft feces from the dorsal waist side by providing an extension extending from the ventral waist end at the waist side of the dorsal part. Patent Documents 3 and 4 describe a pant-type absorbent article that provides an extension extending from near the leg opening at the leg side of the dorsal part and covers the buttocks to have an appearance similar to clothing.

Prior Art Documents

Patent Documents

[0004]

Patent Document 1

Patent Document 2

Patent Document 3

Patent Document 4

Summary of the Invention

Problems to be Solved by the Invention

[0005] In the above pant-type absorbent article, there is a problem of leakage of excrement such as urine and feces from the leg opening.

[0006] This invention was made in view of the above-mentioned problems, and relates to a pant-type absorbent article that suppresses leakage of excrement from the leg opening. [Means for solving the problem]

[0007] One embodiment of the present invention comprises a pant-type absorbent article comprising an abdominal portion, a dorsal portion, and an absorbent body. The above-mentioned pant-type absorbent article has a longitudinal direction extending from the wearer's abdominal side through the crotch area to the back, and a transverse direction perpendicular to the longitudinal direction. The above-mentioned pant-type absorbent article has a waist opening and a pair of leg openings. The ventral portion mentioned above is positioned against the wearer's skin. The aforementioned back portion is positioned on the wearer's back. The ventral portion has a ventral waist end that constitutes the waist opening, and a ventral crotch end located longitudinally inward from the ventral waist end. The dorsal portion described above has a dorsal waist end that constitutes the waist opening described above, and a dorsal crotch end located longitudinally inward from the dorsal waist end described above. The dorsal waist end is located further from the leg opening side in the longitudinal direction than the ventral waist end. The ventral crotch end mentioned above is located further from the waist opening side in the longitudinal direction than the dorsal crotch end mentioned above. The dorsal portion described above has a dorsal extension and a dorsal main body. The dorsal extension extends from a position corresponding to the ventral waist end in the longitudinal direction to the dorsal waist end. The dorsal main body portion described above is the portion obtained by removing the dorsal extension portion described above from the dorsal portion. The ventral portion described above has a ventral extension and a ventral main body. The ventral extension extends from a position corresponding to the dorsal crotch end in the longitudinal direction to the ventral crotch end. The ventral main body portion is the portion obtained by removing the ventral extension portion from the ventral portion. The above-mentioned pant-type absorbent article comprises a pair of side seals, the lateral edge of the ventral main body and the lateral edge of the dorsal main body being joined together. Each of the above-mentioned dorsal extension, dorsal main body, ventral extension, and ventral main body has one or more elastic bodies that extend in the lateral direction and are expandable in the lateral direction. [Effects of the Invention]

[0008] According to the pants-type absorbent article of this invention, leakage of excrement from the leg opening can be suppressed. [Brief explanation of the drawing]

[0009] [Figure 1] This is a schematic perspective view showing a pant-type absorbent article according to an embodiment of the present invention. [Figure 2] This is a schematic plan view showing the skin-facing surface of the above-mentioned absorbent pants, and is a diagram showing the absorbent pants unfolded and the elastic bodies of each part stretched out to form a flat surface. [Figure 3] This is a schematic enlarged view of the area enclosed by circle III in Figure 1, showing the vicinity of the dorsal side reinforcement of the pant-type absorbent material. [Figure 4] This is a schematic enlarged view of the area enclosed by circle IV in Figure 1, showing the vicinity of the ventral side reinforcement of the pant-type absorbent garment. [Figure 5] This is a schematic partial plan view illustrating the positional relationship of the elastic bodies arranged in the ventral and dorsal portions joined by the side seals of the above-mentioned pant-type absorbent article, the elastic body arranged in the dorsal extension portion, and the elastic body arranged in the ventral extension portion, and shows the elastic bodies in each portion stretched out into a planar shape. [Figure 6] This is a schematic cross-sectional view of the side seal, dorsal side reinforcement, and ventral side reinforcement of the above-mentioned pant-type absorbent article. [Figure 7] This is a schematic partial plan view showing the side seal, dorsal side reinforcement, and ventral side reinforcement of the above-mentioned pant-type absorbent article.

Best Mode for Carrying Out the Invention

[0010] Hereinafter, embodiments of the present invention will be described with reference to the drawings. In addition, the same reference numerals may be given to the components already described, and the description may be omitted in some cases.

[0011] <Overall Configuration of Diaper-Type Absorbent Article> FIGS. 1 and 2 show a disposable diaper 1 as a diaper-type absorbent article according to an embodiment of the present invention. The disposable diaper 1 is hereinafter referred to as the diaper 1.

[0012] > As shown in FIG. 1, the diaper 1 includes a waist opening 1W and a pair of leg openings 1L, and is worn around the wearer's torso and groin when worn. The waist opening 1W has a waist opening edge Wa. The diaper 1 has a longitudinal direction X and a lateral direction Y. The longitudinal direction X corresponds to the direction extending from the front side of the wearer through the groin to the back side. The lateral direction Y is perpendicular to the longitudinal direction X and corresponds to the left-right direction of the wearer. As shown in FIG. 2, the direction perpendicular to the longitudinal direction X and the lateral direction Y of the diaper 1 in the deployed and extended state is defined as the thickness direction Z.

[0013] As shown in FIG. 1, in the torso portion 10 of the diaper 1, the lateral direction Y coincides with the circumferential direction of the torso portion 10. In the worn diaper 1, the longitudinal direction X includes the vertical direction and the front-back direction, and the lateral direction Y, the vertical direction, and the front-back direction are perpendicular to each other. On the front-back direction axis, the front direction means the front side, and the back direction means the back side. On the vertical direction axis, the upward direction means the side of the waist opening 1W, and the downward direction means the side of the leg opening 1L (lower thigh side). The torso portion 10 is a cylindrical portion where the back body portion 61 (described later) and the front body portion 31 (described later) are joined by a side seal 8 (described later).

[0014] In this specification, "waist side" and "upper side" mean the side in the vertical direction X (up and down direction) that is closer to the waist opening end Wa of the waist opening 1W and the side that is further away from the leg opening 1L. "Leg side" and "lower side" mean the side in the vertical direction X (up and down direction) that is further away from the waist opening end Wa and the side that is closer to the leg opening 1L. In this specification, "inside of the lateral direction Y" means the side approaching the vertical center line CL1 that divides the diaper (pants-type absorbent article) in two equal parts in the lateral direction Y. "Outside of the lateral direction Y" means the side away from the vertical center line CL1. In this specification, "inside in the vertical direction X" means the side that approaches the horizontal center line CL2 that divides the unfolded diaper (see Figure 2) in two equal parts in the vertical direction X. In this specification, with respect to the thickness direction Z, the side of the diaper closer to the wearer's skin when worn is referred to as the "skin side," and the side closer to the clothing is referred to as the "non-skin side." Furthermore, "skin-facing surface" means the surface of the diaper or its components that faces the wearer's skin, i.e., the surface that is relatively close to the wearer's skin. "Non-skin-facing surface" means the surface of the diaper or its components that faces the opposite side (clothing side) from the skin-facing surface, i.e., the surface that is relatively far from the wearer's skin.

[0015] When an infant or toddler puts on diaper 1, they first put their legs through the pair of leg openings 1L, pull up diaper 1, and position diaper 1 around the wearer's waist and crotch. In this specification, this series of actions is referred to as the "putting action." The putting action may also be performed by a caregiver rather than the wearer of diaper 1. For this reason, in this specification, the main performer of the putting action is referred to as the "caregiver." Furthermore, the action of the caregiver pulling up diaper 1 is referred to as the "pulling action."

[0016] As shown in Figures 1 and 2, the diaper 1 comprises an abdominal portion 3 positioned on the wearer's abdominal side when worn, a dorsal portion 6 positioned on the wearer's back, and an absorbent body 4 fixed across the abdominal portion 3 and the dorsal portion 6. The absorbent body 4 is located between the abdominal portion 3 and the dorsal portion 6 and forms a crotch portion 9 positioned in the wearer's groin area. The absorbent body 4 has a substantially rectangular shape with a longitudinal direction parallel to the vertical direction X extending from the abdominal portion 3 to the dorsal portion 6 of the diaper 1 and a width direction parallel to the horizontal direction Y. The diaper 1 also comprises a plurality of elastic bodies 70 positioned on the abdominal portion 3 and the dorsal portion 6, a leg elastic body 11, and an elastic body 25 for forming a leak-proof cuff.

[0017] Furthermore, the diaper 1 has a pair of side seals 8, each formed by joining the lateral edge 54 of the ventral main body 31 in the lateral direction Y and the lateral edge 55 of the dorsal main body 61 in the lateral direction Y. In other words, the right side seal 8 has a configuration in which the right lateral edge 54 of the ventral main body 31 and the right lateral edge 55 of the dorsal main body 61 are joined together by overlapping them in the thickness direction Z. The left side seal 8 has a configuration in which the left lateral edge 54 of the ventral main body 31 and the left lateral edge 55 of the dorsal main body 61 are joined together by overlapping them in the thickness direction Z. The lateral edge portion 54 of the ventral main body portion 31 is a portion having a predetermined width, including the lateral edge 540 which is the lateral edge (lateral edge located on the left and right sides) of the ventral main body portion 31 in the lateral direction Y. The side edge portion 55 of the dorsal main body portion 61 is a portion having a predetermined width, including the side edge 550 which is the side edge (side edge located on the left and right) of the dorsal main body portion 61 in the lateral direction Y.

[0018] As will be explained in more detail later, as shown in Figure 1, the dorsal portion 6 of the diaper 1 is provided with a dorsal extension 60, and the ventral portion 3 is provided with a ventral extension 32. The dorsal extension 60 is the portion of the dorsal portion 6 that protrudes vertically upward X from the ventral portion 3. The ventral extension 32 is the portion of the ventral portion 3 that protrudes vertically downward X from the dorsal portion 6.

[0019] Figure 2 shows the diaper 1 unfolded, with the elastic bodies of each part extended, and spread out flat to achieve the design dimensions, completely eliminating the influence of the elastic bodies. This form is also referred to as the "unfolded and extended state" of the diaper 1. Unfolding the diaper 1 means separating the ventral main body part 31 and the dorsal main body part 61 of the side seal 8.

[0020] Figure 6 is a schematic cross-sectional view of the dorsal side reinforcement portion 105, the ventral side reinforcement portion 125, and the side seal 8. Although the absorbent body 4 does not exist in the side seal 8, it is conveniently shown in Figure 6 to explain the arrangement relationship between the absorbent body 4 and the ventral portion 3 and dorsal portion 6 in the article thickness direction (Z-axis direction). Also, although the ventral portion 3 and dorsal portion 6 are conveniently shown separated in Figure 6, the ventral body portion 31 of the ventral portion 3 and the dorsal body portion 61 of the dorsal portion 6 are joined by the side seal 8.

[0021] <Details of each configuration> [Composition of the dorsal side] The back portion 6 is positioned on the wearer's back when worn. As shown in Figures 1 and 2, the back portion 6 has a back extension portion 60 and a back main body portion 61. As shown in Figure 2, the back portion 6 has a rectangular shape when unfolded and extended, and has a back waist end portion 102 and a back crotch end portion 108 located inward in the vertical direction X from the back waist end portion 102. The back extension portion 60 and the back main body portion 61 also have a rectangular shape. A line parallel to the horizontal direction Y, which is virtually set at the boundary between the back extension portion 60 and the back main body portion 61, is referred to as the first virtual boundary line 131. The back waist end portion 102 constitutes the waist opening 1W.

[0022] As shown in Figures 1 and 6, the dorsal extension 60 extends in the vertical direction X (up and down direction) from a position corresponding to the ventral waist end 101 to the dorsal waist end 102. In diaper 1, the dorsal extension 60 is a portion that protrudes upward from the ventral waist end 101. In diaper 1, the dorsal waist end 102 is located further from the pair of leg openings 1L side in the vertical direction X than the ventral waist end 101. When wearing diaper 1, the dorsal extension 60 can prevent leakage of excrement such as soft stool from the waist side on the back of the diaper.

[0023] The dorsal main body portion 61 is the portion obtained by removing the dorsal extension portion 60 from the dorsal portion 6. The dorsal main body portion 61 is the portion located in the same position as the ventral main body portion 31 in the longitudinal direction X, while the dorsal extension portion 60 is the portion that does not face the ventral portion 3 and protrudes upward in the longitudinal direction X.

[0024] In this specification, "the ventral main body portion 31 and the dorsal main body portion 61 are in the same position in the longitudinal direction X" means that, in the extended state shown in Figure 5, the ventral main body portion 31 and the dorsal main body portion 61 are adjacent to each other and their position and length in the longitudinal direction X coincide.

[0025] As shown in Figure 1, in the diaper 1, the dorsal main body portion 61 is joined to the ventral main body portion 31 by a side seal 8 to form a cylindrical waist portion 10. On the other hand, the dorsal extension portion 60 is not ring-shaped because there is no ventral portion at the same position in the longitudinal direction X, and is provided with a pair of dorsal extension side edges 104 that are free ends located on both the left and right sides (both ends of the transverse direction Y). Each of the pair of dorsal extension side edges 104 extends in the longitudinal direction X. As shown in Figures 2 and 3, the dorsal extension side edge portion 104 is a portion having a predetermined width that includes the dorsal extension side edge 1040, which is the side edge (side edge located on the left and right) of the dorsal extension portion 60 in the lateral direction Y.

[0026] As shown in Figures 1 to 3, the dorsal extension 60 may have a pair of dorsal side reinforcing portions 105 provided on each of the pair of dorsal extension side edges 104. Each of the pair of dorsal extension side edges 104 extends in the vertical direction X. The dorsal side reinforcement section 105 and the ventral side reinforcement section 125, which will be described later, are areas that have been reinforced with increased rigidity. In Figure 2, the area of ​​the side seal 8 is shown filled with dots, and the areas of the dorsal side reinforcement 105 and the ventral side reinforcement 125 (described later) are shown filled with diagonal lines. Details of the dorsal side reinforcement 105, the ventral side reinforcement 125, and the side seal 8 will be described later.

[0027] As shown in Figure 6, the back portion 6 has a plurality of elastic bodies 70 and a back sheet member 5B in which a plurality of thermoplastic sheets are laminated. The back sheet member 5B preferably includes, for example, an outer layer sheet 51 and an inner layer sheet 52 as the plurality of thermoplastic sheets. The outer layer sheet 51 is positioned on the non-skin side of the inner layer sheet 52 and forms the non-skin opposing surface of the back portion 6. The plurality of elastic bodies 70 are arranged between the inner layer sheet 52 and the outer layer sheet 51.

[0028] In the diaper 1 of this embodiment, at least a portion of the back sheet member 5B is folded back toward the skin from the waist opening end Wa, so that the back sheet member 5B has a folded structure. In the back portion 6 of diaper 1, the laminated outer sheet 51 and inner sheet 52 are folded back towards the skin from the back waist end 102. In the back portion 6, where the back sheet member 5B is folded back and two layers of back sheet member 5B are laminated, the two layers of back sheet member 5B are bonded together with a hot melt adhesive (not shown). In diaper 1, in the folded portion where the back sheet member 5B is folded back towards the skin, the outer sheet 51 is longer in the vertical direction X than the inner sheet 52, and the end of the outer sheet 51 in the vertical direction X covers the back end 4b of the absorbent body (described later).

[0029] [Structure of the ventral region] The ventral portion 3 is positioned on the wearer's ventral side when worn. As shown in Figures 1 and 2, the ventral portion 3 has a ventral main body portion 31 and a ventral extension portion 32. As shown in Figure 2, the ventral portion 3 has a rectangular shape when unfolded and extended, and has a ventral waist end portion 101 and a ventral crotch end portion 107 located longitudinally X-inward from the ventral waist end portion 101. The ventral main body portion 31 and the ventral extension portion 32 also have rectangular shapes. A line parallel to the transverse direction Y, which is virtually set at the boundary between the ventral main body portion 31 and the ventral extension portion 32, is referred to as the second virtual boundary line 132. The ventral waist end portion 101 constitutes the waist opening 1W.

[0030] The ventral extension 32 extends from a position corresponding to the dorsal crotch end 108 in the vertical direction X (up and down direction) to the ventral crotch end 107. In diaper 1, the ventral extension 32 is the part that protrudes downward from the dorsal crotch end 108. In diaper 1, the ventral crotch end 107 is located further from the waist opening 1W side in the vertical direction X than the dorsal crotch end 108. When wearing diaper 1, the ventral extension 32 can suppress leakage of excretions such as urine and feces from the ventral leg opening 1L side (crotch side).

[0031] The ventral main body portion 31 is the portion obtained by removing the ventral extension portion 32 from the ventral portion 3. The ventral main body portion 31 is the portion that is in the same position as the dorsal main body portion 61 in the longitudinal direction X, and the ventral extension portion 32 is the portion that does not face the dorsal portion 6 and protrudes downward in the longitudinal direction X.

[0032] The ventral extension 32 is not ring-shaped because there is no dorsal portion at the same position in the longitudinal direction X, and it comprises a pair of ventral extension lateral edges 124 that are free ends located on both the left and right sides (both ends of the transverse direction Y). Each of the pair of ventral extension lateral edges 124 extends in the longitudinal direction X. As shown in Figures 2 and 4, the ventral extension lateral edges 124 are portions having a predetermined width, including the ventral extension lateral edges 1240, which are the lateral edges (lateral edges located on the left and right) of the ventral extension 32 in the transverse direction Y.

[0033] As shown in Figures 1, 2, and 4, the ventral extension 32 may have a pair of ventral side reinforcing portions 125 provided on each of the pair of ventral extension side edges 124. Each of the pair of ventral extension side edges 124 extends in the longitudinal direction X.

[0034] As shown in Figure 6, the ventral portion 3 has a plurality of elastic bodies 70 and a ventral sheet member 5A in which a plurality of thermoplastic sheets are laminated. In the diaper 1, it is preferable that the ventral sheet member 5A includes, for example, an outer layer sheet 51 and an inner layer sheet 52 as the plurality of thermoplastic sheets. The outer layer sheet 51 is positioned on the non-skin side of the inner layer sheet 52 and forms the non-skin facing surface of the dorsal portion 6. A plurality of elastic bodies 70 are arranged between the inner layer sheet 52 and the outer layer sheet 51.

[0035] In the diaper 1 of this embodiment, at least a portion of the abdominal sheet member 5A is folded back toward the skin from the waist opening end Wa, so that the abdominal sheet member 5A has a folded structure. In the ventral portion 3 of diaper 1, the laminated outer sheet 51 and inner sheet 52 are folded back towards the skin from the ventral waist end 101. In the ventral portion 3, where the ventral sheet member 5A is folded back and two layers of ventral sheet member 5A are laminated, the two layers of ventral sheet member 5A are bonded together with a hot melt adhesive (not shown). In diaper 1, in the folded portion where the ventral sheet member 5A is folded back towards the skin, the outer sheet 51 is longer in the vertical direction X than the inner sheet 52, and the end of the outer sheet 51 in the vertical direction X covers the ventral end 4a of the absorbent body (described later).

[0036] The thermoplastic sheets used in the ventral portion 3 and the dorsal portion 6 are sheet materials mainly composed of thermoplastic resin. The thermoplastic sheets preferably contain 90% by mass or more of thermoplastic resin, and more preferably consist of 100% by mass of thermoplastic resin. In addition, multiple thermoplastic sheets may also contain cellulosic fibers in addition to thermoplastic fibers. Examples of thermoplastic resins include polyolefins such as polyethylene and polypropylene; polyesters such as polyethylene terephthalate; polyamides such as nylon 6 and nylon 66; polyacrylic acid, polyalkyl methacrylate, polyvinyl chloride, and polyvinylidene chloride. These can be used individually or in combination of two or more. The thermoplastic fibers may be short or long fibers. As thermoplastic fibers, composite fibers such as core-sheath type or side-by-side type, split fibers, irregularly shaped cross-section fibers, and heat-shrinkable fibers can also be used. Examples of cellulose fibers include natural cellulose fibers such as cotton and pulp, and regenerated cellulose fibers such as rayon and cupro. These can be used individually or in combination of two or more types.

[0037] [Composition of the absorbent body] As shown in Figures 1, 2, and 6, the absorbent body 4 comprises a liquid-permeable surface sheet 2 that forms the skin-facing surface, a liquid-impermeable (including water-repellent) back sheet 7 that forms the non-skin-facing surface, and a liquid-retaining absorbent 40 positioned between the surface sheet 2 and the back sheet 7. The back sheet 7 constitutes the non-skin-facing surface of the crotch area 9. The absorbent 40 has an absorbent core made of an aggregate of fibers such as pulp fibers or nonwoven fabric, or an absorbent core having water-absorbent polymer particles held therein, and a core wrap sheet covering the absorbent core. The materials used in each component of the absorbent body 4 (back sheet 7, absorbent 40, surface sheet 2, etc.) can be any material used in the art without particular limitation.

[0038] As shown in Figure 2, each side of the absorbent body 4 along the longitudinal direction X is provided with a leak-proof cuff 24, which has an elastic body 25 for forming a leak-proof cuff that is stretched in the longitudinal direction X. The leak-proof cuff 24 is made of a material that is impermeable to liquid or water-repellent and breathable. The elastic body 25 for forming the leak-proof cuff is provided near the free end 24a of the leak-proof cuff 24. When the diaper 1 is worn, the contraction of the elastic body 25 causes the free end 24a side of the leak-proof cuff to stand up, forming a three-dimensional gather, which prevents the leakage of bodily fluids in the lateral direction Y. In addition, when the diaper 1 is pulled up, the contraction force of the elastic body 25 makes it easier to pull the absorbent body 4 up to the vicinity of the wearer's crotch.

[0039] As shown in Figure 2, the absorbent body 4 has a leg cuff 26 that extends along the vertical direction X, located laterally Y outward from each leak-proof cuff 24. An elastic leg body 11, which extends along the vertical direction X, is attached to the free end of the leg cuff 26 in an extended state. The leg cuff 26 forms a leg gather when the elastic leg body 11 contracts, so that it fits around the wearer's legs when the diaper 1 is worn.

[0040] As shown in Figure 2, the absorbent body 4 has an absorbent body ventral end 4a located at the ventral portion 3, which is the end in the longitudinal direction X, and an absorbent body dorsal end 4b located at the dorsal portion 6. The ventral end 4a of the absorbent body 4 overlaps with the ventral sheet member 5A that constitutes the ventral portion 3. At the overlapping portion, the two are fixed together via an adhesive (not shown). Similarly, the dorsal end 4b of the absorbent body 4 overlaps with the dorsal sheet member 5B of the dorsal portion 6. At the overlapping portion, the two are fixed together via an adhesive (not shown).

[0041] [Configuration of side seal, dorsal side reinforcement, and ventral side reinforcement] The ventral main body portion 31 and the dorsal main body portion 61 are joined by a pair of side seals 8 that extend in a direction including the longitudinal X component, forming a tubular waist portion 10 that conforms to the wearer's waist, and thus forming the waist opening 1W of the diaper 1. In addition, the waist portion 10 and the crotch portion 9 form the leg opening 1L. As shown in Figure 7, the side seals 8 typically include multiple sealing portions S.

[0042] In the side seal 8, the sealing portion S is the portion where the thermoplastic sheets of both the ventral sheet member 5A of the ventral main body portion 31 and the dorsal sheet member 5B of the dorsal main body portion 61 are fused and joined together. The sealing portion S is joined, for example, by pressurizing means and / or heating means, specifically by thermal sealing such as heat sealing or ultrasonic sealing. Multiple sealing portions S are arranged spaced apart in the longitudinal direction X and each extends in the transverse direction Y. By arranging multiple sealing portions S spaced apart in the longitudinal direction X, if one sealing portion S peels off, it is possible to prevent the entire side seal 8 from peeling off along the longitudinal direction X.

[0043] A pair of dorsal side reinforcements 105 are provided on a pair of dorsal extension side edges 104 of the dorsal extension 60, and are continuous with the side seal 8, extending in a direction that includes a component in the longitudinal direction X. As shown in Figure 7, the dorsal side reinforcements 105 include a plurality of sealing portions S, similar to the side seal 8. In the dorsal side reinforcements 105, the sealing portions S are portions where the outer layer sheet 51 and the inner layer sheet 52, which are thermoplastic sheets constituting the dorsal sheet member 5B, are fused and joined together.

[0044] A pair of ventral side reinforcements 125 are provided on a pair of ventral extension side edges 124 of the ventral extension 32, are continuous with the side seal 8, and extend in a direction including a longitudinal X component. As shown in Figure 7, the ventral side reinforcements 125 include a plurality of sealing portions S, similar to the side seal 8. In the ventral side reinforcements 125, the sealing portions S are portions where the outer layer sheet 51 and the inner layer sheet 52, which are thermoplastic sheets constituting the ventral sheet member 5A, are fused and joined together.

[0045] In the example shown in Figure 7, the sealing portion S has a rectangular shape with a longitudinal direction in the lateral direction Y. Multiple sealing portions S are intermittently arranged along the vertical direction X.

[0046] In the side seal 8 (dorsal side reinforcement portion 105, ventral side reinforcement portion 125), the rectangular region surrounding the overall contour of the multiple seal portions S is referred to as the seal region B. The seal region B is a region with higher rigidity compared to the region without seal portions S. Thus, the side seal 8 (dorsal side reinforcement portion 105, ventral side reinforcement portion 125) includes a rectangular, relatively rigid seal region B. The rigidity of the dorsal side reinforcement portion 105 is increased by the presence of the seal region B, and the dorsal extended side edge portion 104 is reinforced. The rigidity of the ventral side reinforcement portion 125 is increased by the presence of the seal region B, and the ventral extended side edge portion 124 is reinforced.

[0047] As shown in Figure 7, the width of the rectangular side seal 8, which extends in a band shape in the vertical direction, is defined as extending from the lateral edge on the inner side of the seal region B in the lateral direction Y to the lateral edge 540 of the ventral main body portion 31 and the lateral edge 550 of the dorsal main body portion 61. The side edge located on the lateral Y side of the side seal 8 is referred to as the inner side seal side edge 8d. This inner side seal side edge 8d coincides with the side edge located on the lateral Y side of the seal region B. The side edge located on the lateral Y-outward side of the side seal 8 is referred to as the outer side seal side edge 8c. This outer side seal side edge 8c coincides with side edges 540 and 550. As shown in Figure 7, each sealing portion S of the side seal 8 does not reach the side edges 540 and 550 in the lateral direction Y, and the side edges located on the lateral side Y of the sealing region B are located laterally inward from the side edges 540 and 550. In other words, the respective ranges of the left and right side seals 8 are the areas extending from the side edge (inner side seal side edge 8d) that is located inside the rectangular seal area B in the lateral direction Y, to the area outside in the lateral direction Y.

[0048] As shown in Figure 7, the width range of the rectangular dorsal side reinforcement portion 105 (ventral side reinforcement portion 125) that extends in a band shape in the vertical direction is defined as extending from the side edge on the inside of the seal region B in the lateral direction Y to the dorsal extension side edge 1040 (ventral extension side edge 1240) of the dorsal extension portion 60 (ventral extension portion 32). The lateral edge located on the medial side in the lateral direction Y of the dorsal side reinforcement portion 105 (ventral side reinforcement portion 125) is referred to as the dorsal medial side reinforcement portion lateral edge 105d (ventral medial side reinforcement portion lateral edge 125d). This dorsal medial side reinforcement portion lateral edge 105d (ventral medial side reinforcement portion lateral edge 125d) coincides with the lateral edge located on the medial side in the lateral direction Y of the seal region B. The lateral edge located on the lateral Y-outward side of the dorsal lateral reinforcement portion 105 is referred to as the dorsal lateral lateral reinforcement portion lateral edge 105c (ventral lateral lateral reinforcement portion lateral edge 125c). This dorsal lateral lateral reinforcement portion lateral edge 105c (ventral lateral lateral reinforcement portion lateral edge 125c) coincides with the dorsal extension lateral edge 1040 (ventral extension lateral edge 1240). As shown in Figure 7, each sealing portion S of the dorsal side reinforcement portion 105 (ventral side reinforcement portion 125) does not reach the dorsal extending side edge 1040 (ventral extending side edge 1240) in the lateral direction Y, and the side edge located on the outside in the lateral direction Y of the sealing region B is located inward in the lateral direction Y than the dorsal extending side edge 1040 (ventral extending side edge 1240). In other words, in the dorsal extension portion 60 (ventral extension portion 32), the range of each of the pair of left and right dorsal side reinforcing portions 105 (ventral side reinforcing portion 125) is the region located laterally outward in the Y direction from the dorsal inner side reinforcing portion lateral edge 105d (ventral inner side reinforcing portion lateral edge 125d), which is the lateral edge extending in the vertical direction X and located laterally inward in the Y direction of the rectangular seal region B.

[0049] Since the dorsal side reinforcement portion 105 and the ventral side reinforcement portion 125 are continuous with the side seal 8 and have a configuration that includes multiple similar sealing portions S, the diaper 1 can be easily manufactured without increasing the manufacturing process or materials.

[0050] As shown in Figures 3 and 4, each pair of side seals 8 has an upper end portion 8a and a lower end portion 8b, which constitute both ends in the longitudinal direction X. The lower end portion 8b is located longitudinally inward from the upper end portion 8a. The upper end portion 8a and the lower end portion 8b each extend in the transverse direction Y. The upper end portion 8a is located on the ventral waist end portion 101 and on the first virtual boundary line 131. The lower end portion 8b is located on the ventral crotch end portion 107 and on the second virtual boundary line 132.

[0051] In the continuous side seal 8 and back side reinforcement portion 105, the upper end portion 8a of the side seal is located at the first boundary portion 110, which is the boundary between the side seal 8 and the back side reinforcement portion 105. The first boundary portion 110 is located on the first virtual boundary line 131. The upper end portion 8a of the side seal is the waist-side end of the side seal 8. In Figure 3, the first boundary portion 110 is virtually shown with a thick dashed line. In the continuous side seal 8 and ventral side reinforcement portion 125, the lower end portion 8b of the side seal is located at the second boundary portion 112, which is the boundary between the side seal 8 and the ventral side reinforcement portion 125. The second boundary portion 112 is located on the second virtual boundary line 132. The lower end portion 8b of the side seal is the end portion of the side seal 8 on the leg opening 1L side (crotch side). In Figure 4, the second boundary portion 112 is virtually shown with a thick dashed line.

[0052] [Structure of an elastic body] In the diaper 1 of this embodiment, as shown in Figures 2, 5, and 6, the dorsal extension portion 60, the dorsal main body portion 61, the ventral extension portion 32, and the ventral main body portion 31 each have one or more elastic bodies 70 that extend in the lateral direction Y and are expandable and contractible in the lateral direction Y. The following are examples of the number of elastic bodies, etc., but are not limited thereto.

[0053] As shown in Figures 2 and 6, the multiple elastic bodies 70 are arranged extending in the lateral direction Y between the outer layer sheet 51 and the inner layer sheet 52. These elastic bodies 70 provide elasticity to the waist of the diaper 1, making it easier to put on and maintaining a good fit when worn. Furthermore, "the elastic body 70 extends in the lateral direction Y" means that the elastic body 70 extends in the lateral direction Y when unfolded and extended. However, the above expression is not limited to the configuration in which the elastic body 70 is parallel to the lateral direction Y when unfolded and extended, but also includes configurations in which the entire body extends in the lateral direction Y. In this embodiment, an example is given in which all of the multiple elastic bodies 70 are parallel to the lateral direction Y.

[0054] As shown in Figure 5, in diaper 1, when the length in the longitudinal direction X from the dorsal waist end 102 to the ventral crotch end 107 is taken as 100%, the region in diaper 1 with a length of 40-85% from the dorsal waist end 102 is called the first region R1.

[0055] As shown in Figures 5 and 6, the diaper 1 has a total of 14 elastic bodies 70 arranged on the back portion 6. Of these, the two elastic bodies 70 located at the uppermost part of the back portion 6 are arranged on the back extension portion 60, and the remaining 12 elastic bodies 70 are arranged on the back main body portion 61. In the upper region of the dorsal portion 6, a first elastic body group 71 is arranged, consisting of 10 elastic bodies 70 arranged at equal intervals in the vertical direction X. In the lower region of the dorsal portion 6, a second elastic body group 72 is arranged, consisting of 4 elastic bodies 70 arranged at equal intervals in the vertical direction X. The spacing between the elastic bodies in the first elastic body group 71 is wider than the spacing between the elastic bodies in the second elastic body group 72.

[0056] Between the first elastic body group 71 and the second elastic body group 72 lies a dorsal elastic body-absence region 68 in which no elastic bodies exist in the longitudinal direction X. As shown in Figure 5, the dorsal elastic body-absence region 68 is located in the first region R1. The length of the dorsal elastic body-absence region 68 in the longitudinal direction X is wider than the elastic body arrangement intervals of the first elastic body group 71 and the elastic body arrangement intervals of the second elastic body group 72.

[0057] As shown in Figures 5 and 6, the diaper 1 has a total of 14 elastic bodies 70 arranged in the ventral portion 3. Of these, the one elastic body 70 located at the very bottom of the ventral portion 3 is arranged in the ventral extension portion 32, and the remaining 13 elastic bodies 70 are arranged in the ventral main body portion 31. In the upper region of the ventral portion 3, a third elastic body group 73 is arranged, consisting of 10 elastic bodies 70 arranged at equal intervals in the longitudinal direction X. In the lower region of the ventral portion 3, a fourth elastic body group 74 is arranged, consisting of 4 elastic bodies 70 arranged at equal intervals in the longitudinal direction X. The spacing of the elastic bodies in the third elastic body group 73 is wider than the spacing of the elastic bodies in the fourth elastic body group 74. In the diaper 1 of this embodiment, the spacing of the elastic bodies in the third elastic body group 73 is equal to the spacing of the elastic bodies in the first elastic body group 71, and the spacing of the elastic bodies in the fourth elastic body group 74 is equal to the spacing of the elastic bodies in the second elastic body group 72. Here, "equally" means that any design misalignment that may occur during diaper manufacturing is within 0.4 mm. In other words, it means that the difference between the elastic body spacing of the third elastic body group 73 and the elastic body spacing of the first elastic body group 71, and the difference between the elastic body spacing of the fourth elastic body group 74 and the elastic body spacing of the second elastic body group 72 are each within ±0.4 mm.

[0058] Between the third elastic body group 73 and the fourth elastic body group 74 lies a ventral elastic body-absence region 38 where no elastic bodies exist in the longitudinal direction X. As shown in Figure 5, the ventral elastic body-absence region 38 is located in the first region R1. The length of the ventral elastic body-absence region 38 in the longitudinal direction X is wider than the elastic body arrangement intervals of the third elastic body group 73 and the elastic body arrangement intervals of the fourth elastic body group 74. In the diaper 1 of this embodiment, the length of the ventral elastic body-absence region 38 in the longitudinal direction X is equal to the length of the dorsal elastic body-absence region 68 in the longitudinal direction X. Here, "equally" means that any design misalignment that may occur during diaper manufacturing is within 1 mm. In other words, it means that the difference between the length in the longitudinal direction X of the ventral elastic body-free region 38 and the length in the longitudinal direction X of the dorsal elastic body-free region 68 is ±1 mm or less.

[0059] The length in the longitudinal direction X from the ventral waist end 101 to the ventral elastic body-free region 38 in the ventral portion 3 is equal to the length in the longitudinal direction X from the dorsal waist end 102 to the dorsal elastic body-free region 68 in the dorsal portion 6. As shown in diaper 1 in Figure 5, in the longitudinal direction X, the ventral elastic body-free region 38 is located below the dorsal elastic body-free region 68. Here, "equally" means that any design misalignment that may occur during diaper manufacturing is within 3 mm. In other words, it means that the difference between the length in the longitudinal direction X from the ventral waist end 101 to the ventral elastic body-free region 38 in the ventral portion 3 and the length in the longitudinal direction X from the dorsal waist end 102 to the dorsal elastic body-free region 68 in the dorsal portion 6 is ±3 mm or less.

[0060] From the viewpoint of ensuring the overall elasticity of the girth, it is preferable that both ends of the elastic body 70 located on the ventral main body portion 31 and the elastic body 70 located on the dorsal main body portion 61 are located on or near the side seal 8. Specifically, it is preferable that the distance of the end from the side seal 8 in the lateral direction Y is 10 mm or less, and it is more preferable that the distance is 0 mm and the end is located within the side seal 8.

[0061] From the viewpoint of ensuring stretchability of almost the entire width of the dorsal extension 60, both ends of the elastic body 70 in the longitudinal direction are preferably located at or near the dorsal side reinforcement portion 105. Specifically, it is preferable that the distance of the end from the dorsal side reinforcement portion 105 in the lateral direction Y is 10 mm or less, and it is more preferable that the distance is 0 mm and the end is located within the dorsal side reinforcement portion 105.

[0062] From the viewpoint of ensuring stretchability over almost the entire width of the ventral extension 32, it is preferable that both ends of the elastic body 70 positioned in the ventral extension 32 are located in or near the ventral side reinforcing portion 125. Specifically, it is preferable that the distance of the end from the ventral side reinforcing portion 125 in the lateral direction Y is 10 mm or less, and it is more preferable that the distance is 0 mm and the end is located within the ventral side reinforcing portion 125.

[0063] As shown in Figure 5, the diaper 1 has a ventral highly elastic region 118 in a part of the first region R1 where an elastic body 70 is provided only in the ventral portion 3, and no elastic body 70 is provided in the dorsal portion 6. This ventral highly elastic region 118 includes a dorsal elastic body-free region 68 of the dorsal portion 6 and a portion of the ventral portion 3 that is in the same position in the longitudinal direction X as the dorsal elastic body-free region 68.

[0064] As shown in Figure 5, the diaper 1 has a dorsal highly stretchable region 117 in a part of the first region R1, where the elastic body 70 is provided only on the dorsal portion 6, and not on the ventral portion 3. The dorsal highly stretchable region 117 includes a ventral elastic body-free region 38 of the ventral portion 3 and a portion of the dorsal portion 6 that is in the same position in the longitudinal direction X as the ventral elastic body-free region 38.

[0065] The elastic body 70, the leg elastic body 11, and the leak-proof cuff forming elastic body 25 can preferably be thread-like (e.g., elastic thread) or string-like (e.g., flat rubber) with a rectangular, square, circular, or polygonal cross-section, or multifilament type thread-like material. The materials for the elastic body 70, the leg elastic body 11, and the leak-proof cuff forming elastic body 25 can be those conventionally used in absorbent articles such as disposable diapers, and are not particularly limited. Examples include synthetic rubbers such as styrene-butadiene, butadiene, isoprene, and neoprene, natural rubber, EVA, stretchable polyolefin, and polyurethane.

[0066] The multiple elastic bodies 70 may all have the same fineness and elongation rate, or their fineness and / or elongation rate may be different depending on the location where they are placed. By varying the fineness and / or elongation rate of the elastic bodies, the spacing between them, etc., depending on the location where the elastic bodies are placed, the stretch stress distribution of the dorsal and ventral parts may be adjusted.

[0067] As an example, in the diaper 1 of this embodiment, the elastic body 70 can be an elastic body having a fineness of 250 dtex or more and 800 dtex or less, more preferably 300 dtex or more and 750 dtex or less, and an elongation ratio of 2.0 times or more and 4.5 times or less, more preferably 2.5 times or more and 3.8 times or less.

[0068] The elongation rate of the elastic body 70 refers to the ratio of the length of the elastic body when the pants-type absorbent article is unfolded and stretched to the length of the elastic body when it is removed from the pants-type absorbent article at its natural length. The elongation rate of the elastic body can be adjusted during manufacturing by changing the degree of elongation of each elastic body placed in the ventral sheet member 5A and the dorsal sheet member 5B. During manufacturing, for example, the elastic body is stretched to a predetermined length, adhesive is applied to the elastic body, and the elastic body is fixed to the ventral sheet member 5A and the dorsal sheet member 5B.

[0069] <Effects and Effects> Generally, the abdomen of infants is protruding. In the diaper 1 of this embodiment, as shown in Figure 1, a dorsal extension 60 with an elastic body 70 is provided on the waist side of the dorsal portion 6, extending upward from the abdominal portion 3. Furthermore, a ventral extension 32 with an elastic body 70 is provided on the leg opening 1L side (crotch side) of the abdominal portion 3, extending downward from the dorsal portion 6. Overall, the diaper 1 is shaped so that the abdominal portion 3 is positioned lower (towards the leg opening 1L) than the dorsal portion 6. With this configuration, the area near the ventral waist end 101 of the ventral portion 3, which is located around the wearer's protruding abdomen, is positioned lower than the area near the dorsal waist end 102 of the dorsal portion 6. Therefore, the diaper 1 can be worn on the wearer without constricting the wearer's protruding abdomen too much, while also covering a sufficient area of ​​skin on the wearer's back, including the buttocks.

[0070] In this embodiment of the diaper 1, by providing a dorsal extension 60 on which an elastic body 70 is placed, leakage of excrement such as soft stool from the waist side on the back can be effectively suppressed, and this is especially effective when the wearer is lying on their back. In other words, by placing the elastic body 70 in the dorsal extension 60, the dorsal extension 60 of the diaper 1 conforms more easily to the shape of the wearer's skin, improving the fit, making it less likely for gaps to form between the dorsal extension 60 and the wearer's skin, and allowing the leakage suppression effect of the dorsal extension 60 to be fully exerted. Furthermore, the contraction force of the elastic body 70 increases the thickness of the dorsal extension 60, making it more robust. This makes it less likely for the dorsal extension 60 to roll up during diaper pulling-up, and also makes it easier to pull up the diaper, thus making it easier to put on the diaper 1 so that the dorsal extension 60 is positioned correctly.

[0071] In diaper 1, as shown in Figure 2, by providing the ventral extension portion 32, when viewing diaper 1 in the thickness direction Z from the non-skin-facing surface of the ventral portion 3, the area near the end of the leg gather in the longitudinal direction X can be covered by the ventral extension portion 32 over a wider area compared to when there is no ventral extension portion. In addition, when wearing diaper 1, the elastic force of the elastic body 70 causes the ventral extension portion 32 to press the area near the end of the leg gather in the longitudinal direction X toward the wearer's skin, thus making it less likely for a gap to form between the wearer's skin and the diaper at the leg opening 1L, and improving the fit of the ventral leg opening 1L. Furthermore, by providing an ventral extension 32 on which an elastic body 70 is positioned, the ventral extension 32 can cover the skin near the leg opening 1L on the ventral side with good fit, making it less likely for gaps to form between the ventral extension 32 and the wearer's skin. This effectively prevents leakage of excretions such as urine and feces from the 1L leg opening on the ventral side, and is particularly effective when the wearer is in a prone position.

[0072] Furthermore, in diaper 1, if the diaper 1 is pulled up too far during the pulling-up motion, the ventral extension 32, which has an elastic body 70, is more likely to catch on the wearer's protruding abdomen, thus suppressing excessive pulling up of diaper 1 and making it easier to put on diaper 1 in the correct position. In addition, as described above, diaper 1 is provided with a dorsal extension 60 which has an elastic body 70, making it less likely for the dorsal extension 60 to roll up during the pulling-up motion and making it easier to pull up, thus making it even easier to put on diaper 1 in the correct position, and allowing the leakage-suppressing effect of the ventral extension 32 and dorsal extension 60 to be fully realized.

[0073] Furthermore, as in the diaper 1 of this embodiment, it is preferable to provide a dorsal side reinforcing portion 105 and a ventral side reinforcing portion 125 to increase the rigidity of the dorsal extended side edge portion 104 and the ventral extended side edge portion 124 and to reinforce them.

[0074] When pulling up diaper 1, the caregiver typically grasps the dorsal extension 60 and pulls up diaper 1. By providing highly rigid dorsal side reinforcements 105 on both the left and right sides of the dorsal extension 60, the dorsal extension side edges 104 are less likely to fold towards the wearer and less likely to roll up on the opposite side of the wearer during the pulling-up motion, ensuring sufficient area of ​​the dorsal extension 60 and making it easier to position the dorsal extension 60 correctly. In addition, the presence of highly rigid dorsal side reinforcements 105 makes it easier to grasp the area around the dorsal extension side edges 104 when pulling up diaper 1, making it easier to grasp the dorsal extension side edges 104 and pull up, and making it easier to put on diaper 1 in the correct position. As a result, the effect of the dorsal extension 60 in suppressing leakage of excrement from the waist side is further enhanced.

[0075] By providing the ventral side reinforcement portion 125, when the diaper 1 is worn, the elastic force of the elastic body 70 allows the ventral extension portion 32 to more securely press the ends of the leg gathers in the vertical direction X toward the wearer's skin, further reducing the gap between the wearer's skin and the diaper at the leg opening 1L, and improving the fit of the ventral leg opening 1L.

[0076] Furthermore, by providing the ventral side reinforcement portion 125, if the diaper 1 is pulled up too far during the pulling-up motion, the ventral extension portion 32 is more likely to catch on the wearer's protruding abdomen. This makes it easier to suppress excessive pulling up of the diaper 1, making it easier to put on the diaper 1 in the correct position, and further enhances the effect of the ventral extension portion 32 in suppressing leakage of excrement from the leg opening 1L side.

[0077] <Relationship between the length from the dorsal waist end to the dorsal end of the absorbent body and the length from the ventral waist end to the ventral end of the absorbent body> As shown in Figures 2 and 6, it is preferable that the length d1 in the vertical direction X from the dorsal waist end 102 to the dorsal end 4b of the absorbent body is longer than the length d2 in the vertical direction X from the ventral waist end 101 to the ventral end 4a of the absorbent body. In other words, it is preferable that the area ratio of the absorbent body 4 overlapping the ventral part 3 to the ventral part 3 is larger than the area ratio of the absorbent body 4 overlapping the dorsal part 6 to the dorsal part 6. With this configuration, the ventral portion 3, where urine is excreted more frequently than feces, has a larger area ratio of absorbent body 4 compared to the dorsal portion 6. This allows for more efficient and reliable absorption of urine, and more effectively suppresses leakage of excrement from the ventral leg opening 1L side.

[0078] In diaper 1 shown in Figure 6, when diaper 1 is worn, the ventral end 4a and the dorsal end 4b of the absorbent body are in the same position in the longitudinal direction X. However, the ventral end 4a of the absorbent body may be positioned above the dorsal end 4b of the absorbent body in the longitudinal direction X. This makes it easier to absorb urine more efficiently and can more effectively suppress leakage of excrement from the ventral leg opening 1L.

[0079] Below are examples of suitable numerical values ​​for lengths d1 and d2 for diaper 1 for infants, but these are not the only values ​​that can be used. Furthermore, lengths d1 and d2 can be appropriately adjusted depending on the size of diaper 1. From the viewpoint of effectively suppressing leakage of excrement such as soft stool from the waist side, the length d1 in the vertical direction X from the back waist end 102 to the back end 4b of the absorbent body is preferably 25 mm or more and 90 mm or less, and more preferably 30 mm or more and 70 mm or less. From the viewpoint of suppressing leakage of excretions such as urine from the waist side while increasing the amount of urine absorbed, the length d2 in the vertical direction X from the waist end 101 to the ventral end 4a of the absorbent body is preferably 10 mm or more and 60 mm or less, and more preferably 15 mm or more and 50 mm or less.

[0080] <Relationship between the length from the upper end of the side seal to the end of the dorsal absorbent body and the length from the upper end of the side seal to the ventral end of the absorbent body> As shown in diaper 1 in Figures 2 and 6, it is preferable that the length d3 in the vertical direction X from the upper end 8a of the side seal to the dorsal end 4b of the absorbent body is equal to the length d4 in the vertical direction X from the upper end 8a of the side seal to the ventral end 4a of the absorbent body. Here, "equal" means that any design misalignment that may occur during diaper manufacturing is within 5 mm. In other words, it means that the difference between length d3 and length d4 is ±5 mm or less. With this configuration, the area of ​​the absorbent body 4 overlapping the dorsal body 61 and the ventral body 31, which are located in the same position in the vertical direction X, can be made approximately equal to the area of ​​the absorbent body 4 overlapping the dorsal body 61 and the ventral body 31, allowing urine and feces to be absorbed evenly by the absorbent body 4 on both the dorsal and ventral sides. This makes it possible to more effectively suppress leakage of excrement from the ventral leg opening 1L.

[0081] Below are examples of suitable numerical values ​​for lengths d3 and d4 for diaper 1 for infants, but these are not the only values ​​that can be used. Furthermore, lengths d3 and d4 can be appropriately adjusted depending on the size of diaper 1. From the viewpoint of adequately absorbing and retaining excrement, the length d3 in the vertical direction X from the upper end 8a of the side seal to the back end 4b of the absorbent body is preferably 10 mm or more and 70 mm or less, and more preferably 20 mm or more and 50 mm or less. From the viewpoint of adequately absorbing and retaining excrement, the length d4 in the vertical direction X from the upper end 8a of the side seal to the ventral end 4a of the absorbent body is preferably 10 mm or more and 70 mm or less, and more preferably 20 mm or more and 50 mm or less.

[0082] <Relationship between lateral stretch stress in the dorsal main body and lateral stretch stress in the ventral main body> It is preferable that the lateral stretch stress in the Y direction of the dorsal main body portion 61 is equal to the lateral stretch stress in the Y direction of the ventral main body portion 31. The method for measuring the lateral stretch stress in the Y direction of the dorsal main body portion 61 and the ventral main body portion 31 will be described later. Here, "equal" means that the difference between the lateral Y-axis stretch stress of the dorsal main body portion 61 and the lateral Y-axis stretch stress of the ventral main body portion 31 is ±3 cN / 10 mm or less. This configuration allows the absorbent body 4 to fit almost evenly against the wearer's skin on both the back and front sides. This enables balanced absorption and retention of urine and feces on both the back and front sides, further suppressing leakage of excrement from around the 1L leg opening on the front side.

[0083] Examples of lateral Y-stress stress in the dorsal body portion 61 and the ventral body portion 31 are given below, but the values ​​are not limited to those given here. The expansion and contraction stress of the dorsal main body portion 61 is preferably 5 cN / 10 mm or more and 55 cN / 10 mm or less, and more preferably 10 cN / 10 mm or more and 45 cN / 10 mm or less. The tensile stress of the ventral main body portion 31 is preferably 5 cN / 10 mm or more and 55 cN / 10 mm or less, and more preferably 10 cN / 10 mm or more and 45 cN / 10 mm or less.

[0084] In the diaper 1 of this embodiment, 12 elastic bodies 70 are arranged in the dorsal main body portion 61, and 11 elastic bodies 70 are arranged in the ventral main body portion 31. The number of elastic bodies arranged in the dorsal main body portion 61 and the ventral main body portion 31 is approximately the same, and the stretch and contraction stresses of the dorsal main body portion 61 and the ventral main body portion 31 are equal.

[0085] <Ventral high stretch area> Diaper 1 preferably has a ventral highly elastic region 118 in the first region R1. As shown in Figure 6, the first region R1 is located near the wearer's iliac crest when worn, and the absorbent body 4 is present throughout the entire longitudinal X area. The dorsal portion 6 is the area where feces, which are less easily absorbed by the absorbent body 4 than urine, are excreted. In the diaper 1, the absence of an elastic body 70 in the dorsal portion 6 of the ventral high-stretch region 118 creates a dorsal space, making it easier to hold feces within this space. Furthermore, even when the absorbent body 4 absorbs a large amount of urine or feces, the presence of an elastic body 70 in the ventral portion 3 of the ventral high-stretch region 118 allows the diaper 1 to fit snugly around the wearer's iliac crest, preventing the diaper 1 from slipping down and making it easier to ensure the diaper is properly positioned. This further effectively suppresses leakage of excrement from the ventral leg opening 1L.

[0086] Furthermore, the first region R1 is an area where the caregiver's fingertips can easily position themselves when inserting their fingers from the waist opening 1W side of the diaper 1 to spread it open. By providing a ventral high-stretch region 118 in this first region R1 where there is no elastic body 70 on the dorsal side 6 and there is an elastic body on the ventral side 3, the caregiver's fingers can easily catch in the dorsal elastic body-free region 68. Also, because the elastic body 70 is placed in the part of the ventral side 3 that is in the same position as the dorsal elastic body-free region 68 in the longitudinal direction X, the ventral side 3 is less likely to stretch excessively, making it easier to pull up the diaper 1. Similarly, by providing a dorsal highly elastic region 117 in the first region R1 where there is no elastic body 70 in the ventral region 3 but there is an elastic body in the dorsal region 6, the caregiver's fingers can easily catch on the ventral region 38 where there is no elastic body, and because the elastic body 70 is placed in the part of the dorsal region 6 that is in the same position as the ventral region 38 in the longitudinal direction X, the dorsal region 6 is less likely to stretch excessively, making it easier to pull up the diaper 1. Thus, diaper 1 has features that make it easy to grip with fingers on both the dorsal side 6 and the ventral side 3, resulting in good pulling-up functionality for diaper 1.

[0087] From the viewpoint of improving the lifting motion of the diaper 1, the length of the longitudinal X of the dorsal elastic body-free region 68 is preferably 10 mm or more and 50 mm or less, and more preferably 15 mm or more and 40 mm or less. From the viewpoint of improving the lifting motion of the diaper 1, the length of the longitudinal X of the ventral elastic body-free region 38 is preferably 10 mm or more and 50 mm or less, and more preferably 15 mm or more and 40 mm or less. Furthermore, the spacing between the elastic bodies of the first elastic body group 71 and the third elastic body group 73 is preferably 4 mm or more and 7 mm or less, and more preferably 5 mm or more and 6 mm or less. The spacing between the second elastic body group 72 and the fourth elastic body group 74 is preferably 3 mm or more and 6 mm or less, and more preferably 4 mm or more and 5 mm or less. As described above, in the diaper 1 of this embodiment, the spacing between the elastic bodies of the first elastic body group 71 and the third elastic body group 73 is wider than the spacing between the elastic bodies of the second elastic body group 72 and the fourth elastic body group 74.

[0088] <Longitudinal length of the dorsal and ventral extensions> In the diaper 1 of this embodiment, as shown in Figure 2, when unfolded and extended, both the dorsal extension portion 60 and the ventral extension portion 32 are rectangular in shape and form a band of equal width with the same length in the vertical direction X along the horizontal direction Y.

[0089] In diaper 1, the length of the dorsal extension portion 60 in the vertical direction X (length from the first virtual boundary line 131 to the dorsal waist end portion 102) is preferably 10 mm or more and 40 mm or less, and more preferably 15 mm or more and 30 mm or less, from the viewpoint of good pulling-up operation of the diaper and effectively suppressing leakage of excrement from the dorsal waist side.

[0090] The length in the longitudinal direction X of the dorsal extension 60 refers to the minimum length. As shown in Figure 2, if the dorsal waist end 102 is a straight line parallel to the transverse direction Y, the length in the longitudinal direction X of the dorsal extension 60 (the length from the dorsal waist end 102 to the first virtual boundary line 131 in the longitudinal direction X) is equal across the entire width in the transverse direction Y. However, if, for example, the dorsal waist end 102 is a curved shape that is convex upward in the longitudinal direction X, the length in the longitudinal direction X of the dorsal extension 60 will not be equal across the entire width in the transverse direction Y. In such a configuration, the length of the part of the dorsal extension 60 where the length in the longitudinal direction X is minimum (minimum length) is defined as the "length in the longitudinal direction X of the dorsal extension 60". The same applies to the ventral extension 32.

[0091] The length of the ventral extension 32 in the longitudinal direction X (length from the second virtual boundary line 132 to the dorsal crotch end 108) is preferably 10 mm or more and 40 mm or less, and more preferably 15 mm or more and 30 mm or less, from the viewpoint of improving the fit of the leg opening 1L and effectively suppressing leakage of excrement from the leg opening 1L side.

[0092] <Method for measuring the stretch stress of the dorsal and ventral main body sections> The lateral Y-direction tensile stress of the dorsal main body portion 61 and the ventral main body portion 31 is measured as follows.

[0093] [Measurement sample] Peel off the side seal 8 of diaper 1, stretch and unfold it as shown in Figure 3 to spread it flat, and cut out the areas of the dorsal main body portion 61 and the ventral main body portion 31 along straight lines parallel to the transverse direction of the diaper to obtain samples. When cutting out, cut the entire diaper including the absorbent body 4, not just the dorsal portion 6 and the ventral portion 3, and then remove the absorbent body 4. Alternatively, remove the absorbent body 4 first, and then cut out the dorsal main body portion 61 and the ventral main body portion 31. If an elastic body exists at the boundary between adjacent parts, the elastic body at the boundary should be placed in the upper part (waist side part), and the cut should be made in the part other than the adjacent elastic body. For example, if an elastic body exists at the boundary between the dorsal extension portion 60 and the dorsal main body portion 61, the elastic body should be placed in the dorsal extension portion 60. Record the length (mm) in the longitudinal direction X and transverse direction Y of each cut-out sample.

[0094] [Measurement of lateral Y-axis stretch stress] The sample is clamped at both ends in the chuck of a tensile testing machine (SHIMADZU "Autograph AG-X"), and stretched at a speed of 300 mm / min. The length between the side seals of the dorsal body 61 and ventral body 31, measured using the inner dimensions of the dorsal body 61 and ventral body 31, is set to 100 (e.g., 350 mm). The sample is stretched to a length equivalent to 80 (e.g., 280 mm), and then contracted to a length equivalent to 71 (e.g., 250 mm). The tensile load (cN) at this point is measured. This measured tensile load (cN) is converted to a tensile load (cN) per unit length (10 mm). The value obtained by dividing this converted tensile load (cN) per unit length (10 mm) by the length of the sample in the X direction is taken as the stretch stress in the Y direction. The reason for defining the return force at a length equivalent to 71 when the inner dimensions of the dorsal main body portion 61 and the ventral main body portion 31 are set to 100 is that the waist circumference of infants, who are the primary target of wearing the diaper 1 of this embodiment, is approximately 71% of the inner dimensions of the diaper. The waist circumference referred to here is the average value of the waist circumference measured in standing and sitting positions, taking into account the change in waist circumference when the posture of the infant changes. Each of the pair of side seals 8 (or dorsal side reinforcement portion 105 or ventral side reinforcement portion 125) has an inner edge located on the lateral Y side (inner side seal side edge 8d (dorsal inner side reinforcement portion side edge 105d or ventral inner side reinforcement portion side edge 125d)), and the above "inner dimensions" refers to the distance between the pair of inner edges. Furthermore, the "internal dimensions" mentioned above refer to the internal dimensions when the sheets (thermoplastic sheets) constituting the dorsal portion 6 and ventral portion 3 are not contracted by the elastic material, in other words, when only the ventral and dorsal portions are stretched without the elastic material.

[0095] Although embodiments of the present invention have been described above, the present invention is not limited to the embodiments described above, and various modifications can be made without departing from the spirit of the present invention.

[0096] For example, in the above embodiment, a pant-type diaper in which the ventral and dorsal parts are separated was given as an example, but it may also be a pant-type diaper in which the absorbent main body is fixed to the skin-facing surface of an outer body in which the ventral part, dorsal part, and crotch area positioned between the ventral and dorsal parts are integrated, and the main body is stretched across the dorsal and ventral parts. In this case, the ventral part of the outer body has a ventral main body and a ventral extension, and the dorsal part of the outer body has a dorsal main body and a dorsal extension, and the ventral main body and the dorsal main body are joined at both side edges by a pair of side seals to form an outer body having a waist opening and a leg opening. The outer body has a dorsal extension extending from the waist side of the dorsal part and a ventral extension extending from the leg side of the ventral part.

[0097] Furthermore, the pant-type absorbent article according to this invention does not have to be a disposable diaper for infants; for example, it may be a disposable diaper for adults or children. Moreover, the pant-type absorbent article according to this invention does not have to be a disposable diaper, as long as it is an absorbent article worn on the lower body. Examples of such pant-type absorbent articles include pant-type sanitary napkins.

[0098] With regard to the embodiments of the present invention described above, the following additional information is disclosed. <1> A pant-type absorbent article comprising an abdominal portion positioned on the wearer's abdominal side, a dorsal portion positioned on the wearer's back, and an absorbent body fixed across the abdominal and dorsal portions, having a longitudinal direction extending from the wearer's abdominal side through the crotch to the back, and a transverse direction perpendicular to the longitudinal direction, and having a waist opening and a pair of leg openings, The ventral portion has a ventral waist end that constitutes the waist opening, and a ventral crotch end located longitudinally inward from the ventral waist end, The back portion has a back waist end that constitutes the waist opening, and a back crotch end located longitudinally inward from the back waist end, The dorsal waist end is located further from the pair of leg openings in the longitudinal direction than the ventral waist end, The ventral crotch end is located further from the waist opening side in the longitudinal direction than the dorsal crotch end, The dorsal portion is, A dorsal extension extending from a position corresponding to the ventral waist end in the longitudinal direction to the dorsal waist end, The dorsal main body portion obtained by removing the dorsal extension portion from the dorsal portion, It has, The ventral portion is, A ventral extension extending from a position corresponding to the dorsal crotch end in the longitudinal direction to the ventral crotch end, The ventral main body portion obtained by removing the ventral extension portion from the ventral portion, It has, The ventral main body portion and the dorsal main body portion are joined together to form a pair of side seals, The dorsal extension, the dorsal main body, the ventral extension, and the ventral main body each have one or more elastic bodies that extend laterally and are expandable in the later direction. Absorbent pants. <2> The absorbent body has a ventral end of the absorbent body located on the ventral side, which is the longitudinal end, and a dorsal end of the absorbent body located on the dorsal side. The longitudinal length from the dorsal waist end to the dorsal end of the absorbent body is longer than the longitudinal length from the ventral waist end to the ventral end of the absorbent body. The aforementioned <1> Absorbent pant-type articles as described above. <3> The absorbent body has a ventral end of the absorbent body located on the ventral side, which is the longitudinal end, and a dorsal end of the absorbent body located on the dorsal side. Each of the pair of side seals has an upper end of the side seal and a lower end of the side seal located longitudinally inward from the upper end of the side seal. The longitudinal length between the upper end of the side seal and the dorsal end of the absorbent body is equal to the longitudinal length between the upper end of the side seal and the ventral end of the absorbent body. The aforementioned <1> or <2> Absorbent pant-type articles as described above. <4> The lateral expansion and contraction stress of the dorsal main body portion is equal to the lateral expansion and contraction stress of the ventral main body portion. The aforementioned <1> ~ <3> A pant-type absorbent article described in any one of the following. <5> When the longitudinal length from the back waist end to the front crotch end is taken as 100%, a portion of the area in the pant-type absorbent article from the back waist end to the front 40-85% is a highly elastic area on the front where the elastic material is distributed only on the front side and not on the back side. The aforementioned <1> ~ <4> A pant-type absorbent article described in any one of the following. <6> The dorsal extension is, A pair of dorsal extension side edges, each extending in the vertical direction, are located at both ends in the lateral direction, A pair of dorsal side reinforcing portions are provided on each of the pair of dorsal extension side edges. It has, The ventral extension is, A pair of ventral extending side edges, each extending in the longitudinal direction, are located at both ends in the transverse direction, A pair of ventral side reinforcing portions are provided on each of the pair of ventral extension side edges. has The aforementioned <1> ~ <5> A pant-type absorbent article described in any one of the following. <7> In the upper region of the dorsal portion, a first group of elastic bodies consisting of multiple elastic bodies arranged at equal intervals in the vertical direction is provided. In the lower region of the dorsal portion, a second group of elastic bodies, consisting of multiple elastic bodies arranged at equal intervals in the vertical direction, is provided. The spacing between elastic bodies in the first elastic body group is wider than the spacing between elastic bodies in the second elastic body group. In the dorsal portion, there is a region where no elastic bodies exist in the longitudinal direction between the first elastic body group and the second elastic body group. The length in the longitudinal direction of the region where the dorsal elastic body is absent is wider than the spacing between the elastic bodies of the first elastic body group and the second elastic body group. In the aforementioned pant-type absorbent article, if the longitudinal length from the back waist end to the front crotch end is defined as 100%, and the region from the back waist end to 40-85% of that length is defined as the first region, then the region without elastic material on the back is located within the first region. The aforementioned <1> ~ <6> A pant-type absorbent article described in any one of the following. <8> In the upper region of the ventral portion, a third group of elastic bodies, consisting of multiple elastic bodies arranged at equal intervals in the longitudinal direction, is provided. In the lower region of the ventral portion, a fourth group of elastic bodies, consisting of multiple elastic bodies arranged at equal intervals in the longitudinal direction, is provided. The spacing between elastic bodies in the third elastic body group is wider than the spacing between elastic bodies in the fourth elastic body group. The aforementioned <1> ~ <7> A pant-type absorbent article described in any one of the following. <9> In the ventral portion, there is a ventral elastic body-absence region where no elastic bodies exist in the longitudinal direction between the third elastic body group and the fourth elastic body group. The longitudinal length of the region lacking ventral elastic bodies is wider than the elastic body spacing of the third elastic body group and the elastic body spacing of the fourth elastic body group. In the aforementioned pant-type absorbent article, if the longitudinal length from the back waist end to the ventral crotch end is defined as 100%, and the region from the back waist end to 40-85% of that length is defined as the first region, then the ventral elastic material-free region is located within the first region. The aforementioned <8> Absorbent pant-type articles as described above. <10> In the upper region of the dorsal portion, a first group of elastic bodies consisting of multiple elastic bodies arranged at equal intervals in the vertical direction is provided. In the lower region of the dorsal portion, a second group of elastic bodies, consisting of multiple elastic bodies arranged at equal intervals in the vertical direction, is provided. In the upper region of the ventral portion, a third group of elastic bodies, consisting of multiple elastic bodies arranged at equal intervals in the longitudinal direction, is provided. In the lower region of the ventral portion, a fourth group of elastic bodies, consisting of multiple elastic bodies arranged at equal intervals in the longitudinal direction, is provided. The spacing between elastic bodies in the first elastic body group is wider than the spacing between elastic bodies in the second elastic body group. The spacing between elastic bodies in the third elastic body group is wider than the spacing between elastic bodies in the fourth elastic body group. The spacing of the elastic bodies in the third elastic body group is equal to the spacing of the elastic bodies in the first elastic body group, and the spacing of the elastic bodies in the fourth elastic body group is equal to the spacing of the elastic bodies in the second elastic body group. The aforementioned <1> ~ <9> A pant-type absorbent article described in any one of the following. <11> In the upper region of the dorsal portion, a first group of elastic bodies consisting of multiple elastic bodies arranged at equal intervals in the vertical direction is provided. In the lower region of the dorsal portion, a second group of elastic bodies, consisting of multiple elastic bodies arranged at equal intervals in the vertical direction, is provided. In the upper region of the ventral portion, a third group of elastic bodies, consisting of multiple elastic bodies arranged at equal intervals in the longitudinal direction, is provided. In the lower region of the ventral portion, a fourth group of elastic bodies, consisting of multiple elastic bodies arranged at equal intervals in the longitudinal direction, is provided. In the dorsal portion, there is a region where no elastic bodies exist in the longitudinal direction between the first elastic body group and the second elastic body group. In the ventral portion, there is a ventral elastic body-absence region where no elastic bodies exist in the longitudinal direction between the third elastic body group and the fourth elastic body group. The length in the longitudinal direction of the region where the dorsal elastic body is absent is wider than the spacing between the elastic bodies of the first elastic body group and the second elastic body group. The longitudinal length of the region lacking ventral elastic bodies is wider than the elastic body spacing of the third elastic body group and the elastic body spacing of the fourth elastic body group. The longitudinal length of the ventral region where the elastic body is absent is equal to the longitudinal length of the dorsal region where the elastic body is absent. The aforementioned <1> ~ <10> A pant-type absorbent article described in any one of the following. <12> In the upper region of the dorsal portion, a first group of elastic bodies consisting of multiple elastic bodies arranged at equal intervals in the vertical direction is provided. In the lower region of the dorsal portion, a second group of elastic bodies, consisting of multiple elastic bodies arranged at equal intervals in the vertical direction, is provided. In the upper region of the ventral portion, a third group of elastic bodies, consisting of multiple elastic bodies arranged at equal intervals in the longitudinal direction, is provided. In the lower region of the ventral portion, a fourth group of elastic bodies, consisting of multiple elastic bodies arranged at equal intervals in the longitudinal direction, is provided. In the dorsal portion, there is a region where no elastic bodies exist in the longitudinal direction between the first elastic body group and the second elastic body group. In the ventral portion, there is a ventral elastic body-absence region where no elastic bodies exist in the longitudinal direction between the third elastic body group and the fourth elastic body group. The length in the longitudinal direction of the region where the dorsal elastic body is absent is wider than the spacing between the elastic bodies of the first elastic body group and the second elastic body group. The longitudinal length of the region lacking ventral elastic bodies is wider than the elastic body spacing of the third elastic body group and the elastic body spacing of the fourth elastic body group. The longitudinal length from the ventral waist end to the region where the ventral elastic body is absent in the ventral portion is equal to the longitudinal length from the dorsal waist end to the region where the dorsal elastic body is absent in the dorsal portion. The aforementioned <1> ~ <11> A pant-type absorbent article described in any one of the following. <13> In the upper region of the dorsal portion, a first group of elastic bodies consisting of multiple elastic bodies arranged at equal intervals in the vertical direction is provided. In the lower region of the dorsal portion, a second group of elastic bodies, consisting of multiple elastic bodies arranged at equal intervals in the vertical direction, is provided. In the upper region of the ventral portion, a third group of elastic bodies, consisting of multiple elastic bodies arranged at equal intervals in the longitudinal direction, is provided. In the lower region of the ventral portion, a fourth group of elastic bodies, consisting of multiple elastic bodies arranged at equal intervals in the longitudinal direction, is provided. In the dorsal portion, there is a region where no elastic bodies exist in the longitudinal direction between the first elastic body group and the second elastic body group. In the ventral portion, there is a ventral elastic body-absence region where no elastic bodies exist in the longitudinal direction between the third elastic body group and the fourth elastic body group. The length in the longitudinal direction of the region where the dorsal elastic body is absent is wider than the spacing between the elastic bodies of the first elastic body group and the second elastic body group. The longitudinal length of the region lacking ventral elastic bodies is wider than the elastic body spacing of the third elastic body group and the elastic body spacing of the fourth elastic body group. The longitudinal length of the ventral elastic body-absent region is 10 mm or more and 50 mm or less. The longitudinal length of the region where the dorsal elastic body is absent is 10 mm or more and 50 mm or less. The aforementioned <1> ~ <12> A pant-type absorbent article described in any one of the following. <14> The elastic material has a fineness of 250 dtex or more and 800 dtex or less, and an elongation ratio of 2.0 times or more and 4.5 times or less. The aforementioned <1> ~ <13> A pant-type absorbent article described in any one of the following. <15> The absorbent body has a ventral end of the absorbent body located on the ventral side, which is the longitudinal end, and a dorsal end of the absorbent body located on the dorsal side. The length in the vertical direction from the back waist end to the back end of the absorbent body is 25 mm or more and 90 mm or less. The longitudinal length from the ventral waist end to the ventral end of the absorbent body is 10 mm or more and 60 mm or less. The aforementioned <1> ~ <14> A pant-type absorbent article described in any one of the following. <16> The absorbent body has a ventral end of the absorbent body located on the ventral side, which is the longitudinal end, and a dorsal end of the absorbent body located on the dorsal side. Each of the pair of side seals has an upper end of the side seal and a lower end of the side seal located longitudinally inward from the upper end of the side seal. The longitudinal length between the upper end of the side seal and the dorsal end of the absorbent body is 10 mm or more and 70 mm or less, and the longitudinal length between the upper end of the side seal and the ventral end of the absorbent body is 10 mm or more and 70 mm or less. The aforementioned <1> ~ <15> A pant-type absorbent article described in any one of the following. <17> The expansion and contraction stress of the dorsal main body portion is 5 cN / 10 mm or more and 55 cN / 10 mm or less. The tensile stress of the ventral main body is 5 cN / 10 mm or more and 55 cN / 10 mm or less. The aforementioned <1> ~ <16> A pant-type absorbent article described in any one of the following. <18> In the upper region of the dorsal portion, a first group of elastic bodies consisting of multiple elastic bodies arranged at equal intervals in the vertical direction is provided. In the lower region of the dorsal portion, a second group of elastic bodies, consisting of multiple elastic bodies arranged at equal intervals in the vertical direction, is provided. In the upper region of the ventral portion, a third group of elastic bodies, consisting of multiple elastic bodies arranged at equal intervals in the longitudinal direction, is provided. In the lower region of the ventral portion, a fourth group of elastic bodies, consisting of multiple elastic bodies arranged at equal intervals in the longitudinal direction, is provided. The spacing between the elastic bodies of the first elastic body group and the third elastic body group is 4 mm or more and 7 mm or less. The spacing between the elastic bodies of the second and fourth elastic body groups is 3 mm or more and 6 mm or less. The aforementioned <1> ~ <17> A pant-type absorbent article described in any one of the following. <19> The longitudinal length of the dorsal extension is 10 mm or more and 40 mm or less. The aforementioned <1> ~ <18> A pant-type absorbent article described in any one of the following. <20> The longitudinal length of the ventral extension is 10 mm or more and 40 mm or less. The aforementioned <1> ~ <19> A pant-type absorbent article described in any one of the following. [Explanation of Symbols]

[0099] 1. Absorbent pants (disposable diapers, diapers) 1W…Waist opening 1L... Leg opening 3...ventral part 4… Absorbent body 6…Dorsal part 8... Side seal 31...Ventral main body 32...Ventral extension part 54...Lateral margin of the ventral part 55...Lateral edge of the dorsal portion 60...Dorsal extension part 61...Dorsal body part 70...Elastic body 101...Ventral waist end 102...Rear waist end 107...Ventral end near the crotch 108...Rear end near the crotch

Claims

1. A pant-type absorbent article comprising an abdominal portion positioned on the wearer's abdominal side, a dorsal portion positioned on the wearer's back, and an absorbent body fixed across the abdominal and dorsal portions, having a longitudinal direction extending from the wearer's abdominal side through the crotch to the back, and a transverse direction perpendicular to the longitudinal direction, and having a waist opening and a pair of leg openings, The ventral portion has a ventral waist end that constitutes the waist opening, and a ventral crotch end located longitudinally inward from the ventral waist end, The back portion has a back waist end that constitutes the waist opening, and a back crotch end located longitudinally inward from the back waist end, The dorsal waist end is located further from the pair of leg openings in the longitudinal direction than the ventral waist end, The ventral crotch end is located further from the waist opening side in the longitudinal direction than the dorsal crotch end, The dorsal portion is, A dorsal extension extending from a position corresponding to the ventral waist end in the longitudinal direction to the dorsal waist end, The dorsal main body portion obtained by removing the dorsal extension portion from the dorsal portion, It has, The ventral portion is, A ventral extension extending from a position corresponding to the dorsal crotch end in the longitudinal direction to the ventral crotch end, The ventral main body portion obtained by removing the ventral extension portion from the ventral portion, It has, The ventral main body portion and the dorsal main body portion are joined together to form a pair of side seals, The dorsal extension, the dorsal main body, the ventral extension, and the ventral main body each have one or more elastic bodies that extend laterally and are expandable in the later direction. Absorbent pants.

2. The absorbent body has a ventral end of the absorbent body located on the ventral side, which is the longitudinal end, and a dorsal end of the absorbent body located on the dorsal side. The longitudinal length from the dorsal waist end to the dorsal end of the absorbent body is longer than the longitudinal length from the ventral waist end to the ventral end of the absorbent body. The pant-type absorbent article according to claim 1.

3. The absorbent body has a ventral end of the absorbent body located on the ventral side, which is the longitudinal end, and a dorsal end of the absorbent body located on the dorsal side. Each of the pair of side seals has an upper end of the side seal and a lower end of the side seal located longitudinally inward from the upper end of the side seal. The longitudinal length between the upper end of the side seal and the dorsal end of the absorbent body is equal to the longitudinal length between the upper end of the side seal and the ventral end of the absorbent body. The pant-type absorbent article according to claim 1.

4. The lateral expansion and contraction stress of the dorsal main body portion is equal to the lateral expansion and contraction stress of the ventral main body portion. The pant-type absorbent article according to claim 1 or 2.

5. When the longitudinal length from the back waist end to the front crotch end is taken as 100%, a portion of the area in the pant-type absorbent article from the back waist end to the front 40-85% of the length is a highly elastic area on the front where the elastic material is distributed only on the front side and not on the back side. The pant-type absorbent article according to claim 1 or 2.

6. The dorsal extension is, A pair of dorsal extension side edges, each extending in the vertical direction, are located at both ends in the lateral direction, A pair of dorsal side reinforcing portions are provided on each of the pair of dorsal extension side edges. It has, The ventral extension is, A pair of ventral extending side edges, each extending in the longitudinal direction, are located at both ends in the transverse direction, A pair of ventral side reinforcing portions are provided on each of the pair of ventral extension side edges. has The pant-type absorbent article according to claim 1 or 2.

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