Absorbent panty-type items

Abstract

This relates to absorbent pant-type garments that are easy to wear in the correct position. [Solution] The pant-type absorbent article comprises an abdominal portion, a dorsal portion, and an absorbent body, and has a waist opening and leg openings. The abdominal portion has an abdominal waist end and an abdominal crotch end. The dorsal portion has a dorsal waist end and a dorsal crotch end. The dorsal portion has a first dorsal extension extending from the abdominal waist end to the dorsal waist end, a second dorsal extension extending from the abdominal crotch end to the dorsal crotch end, and a dorsal body. The first dorsal extension, the second dorsal extension, the dorsal body, and the abdominal portion each have one or more elastic bodies. The side seal, to which the side edge of the abdominal portion and the side edge of the dorsal body are joined, has a side seal upper end and a side seal lower end. When worn, the first point, which is the outermost point in the lateral direction of the upper end of the side seal, is located dorsally more than the second point, which is the outermost point in the lateral direction of the lower end of the side seal.

Description

TECHNICAL FIELD

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

[0002] A pants-type absorbent article generally includes an absorbent main body, a ventral portion, and a dorsal portion. The ventral portion and the dorsal portion are joined by side seals at lateral side edges, whereby a waist portion of the pants-type absorbent article is formed.

[0003] Patent Document 1 describes a pants-type absorbent article that prevents excrement such as loose stool from leaking from the dorsal waist side by providing a dorsal extension portion on the waist side of the dorsal portion. PRIOR ART DOCUMENTS PATENT DOCUMENTS

[0004] PATENT DOCUMENT 1 Japanese Unexamined Patent Application Publication No. 2023-026803 SUMMARY OF THE INVENTION PROBLEM TO BE SOLVED BY THE INVENTION

[0005] For example, when putting a pants-type absorbent article on a wearer such as an infant or a toddler, the dorsal side of the pants-type absorbent article may be pulled up excessively, creating a gap between the buttocks and the groin, which makes excrement such as loose stool prone to leaking from the crotch side. In addition, if the pants-type absorbent article is not pulled up sufficiently, the dorsal waist end portion may slip down significantly, making excrement prone to leaking from the widthwise center of the dorsal waist end portion of the pants-type absorbent article. In order to suppress such excrement leakage, a pants-type absorbent article that is easy to wear at an appropriate position is desired.

[0006] The present invention has been made in view of the above problems, and relates to a pants-type absorbent article that is easy to wear at an appropriate position. 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 on the wearer's abdominal side. The aforementioned back portion is positioned on the wearer's back. The absorbent body described above is fixed by being spanned across the ventral and dorsal portions. The ventral portion has a ventral waist end that constitutes the waist opening, and a ventral crotch end that faces the ventral waist end in the longitudinal direction. The back portion has a back waist end that constitutes the waist opening, and a back crotch end that is opposite the back waist end in the longitudinal direction. The dorsal waist end is located further from the pair of leg openings in the longitudinal direction than the ventral waist end. The dorsal crotch end mentioned above is located further from the waist opening in the longitudinal direction than the ventral crotch end mentioned above. The dorsal portion described above includes a first dorsal extension, a second dorsal extension, and a dorsal main body. The first dorsal extension extends in the longitudinal direction from the ventral waist end to the dorsal waist end. The second dorsal extension extends in the longitudinal direction from the ventral crotch end to the dorsal crotch end. The dorsal main body portion described above is the portion obtained by removing the first dorsal extension portion and the second dorsal extension portion from the dorsal portion described above. The first dorsal extension, the second dorsal extension, the dorsal main body, and the ventral portion each have one or more elastic bodies that extend in the lateral direction and are expandable and contractible in the lateral direction. The above-mentioned pant-type absorbent article comprises a pair of side seals, the lateral edge of the ventral portion and the lateral edge of the dorsal main body portion being joined together. The above-mentioned side seal has an upper end and a lower end that are opposite to each other in the vertical direction and extend in the horizontal direction. When worn, the first point, which is the outermost point in the lateral direction of the upper end of the side seal, is located dorsally more than the second point, which is the outermost point in the lateral direction of the lower end of the side seal. [Effects of the Invention]

[0008] According to the present invention, the absorbent pant-type article is easy to wear in the correct position. [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 side view showing the above-mentioned pant-type absorbent item being worn by a person, and it shows the arrangement of the elastic material. [Figure 3] This is a schematic plan view showing the skin-facing side of the above-mentioned absorbent pant-type article, and is a diagram showing the absorbent pant-type article unfolded and the elastic bodies of each part stretched out to form a flat surface. [Figure 4] 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 first dorsal extension portion, and the elastic body arranged in the second dorsal extension portion, and shows the elastic bodies in each portion stretched out into a planar shape. [Figure 5] This figure shows a simulated wearing state of the above-mentioned pant-type absorbent item. [Figure 6] This is a schematic enlarged view of the area enclosed by circle VI in Figure 5, showing the vicinity of the first side reinforcement portion of a pant-type absorbent garment in a worn state. [Figure 7]It is a schematic enlarged view of the region enclosed by circle VII in Fig. 5, and is a view of the vicinity of the second side reinforcing portion of the pants-type absorbent article in a worn state. [Figure 8] It is a schematic partial plan view showing the side seal and the side reinforcing portion of the pants-type absorbent article. [Figure 9] It is a schematic plan view of the back-side sheet member constituting a part of the pants-type absorbent article. [Figure 10] It is a schematic cross-sectional view of the side seal and the side reinforcing portion of the pants-type absorbent article. [Mode for Carrying Out the Invention]

[0010] Hereinafter, embodiments of the present invention will be described with reference to the drawings. Note that the same reference numerals are assigned to the previously described configurations, and descriptions thereof may be omitted.

[0011] <Overall Configuration of Pants-type Absorbent Article> In Fig. 1, Fig. 2 and Fig. 3, a pants-type disposable diaper 1 is shown as the pants-type absorbent article according to the embodiment of the present invention. The pants-type disposable diaper 1 is hereinafter referred to as the diaper 1. Fig. 2 schematically shows the diaper 1 in a worn state, and the wearer's torso 13 and legs 14 are also illustrated.

[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 waist and crotch portion when in use. The waist opening 1W has a waist opening end 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 wearer's ventral side through the crotch portion to the back side. The lateral direction Y is orthogonal to the longitudinal direction X and corresponds to the left-right direction of the wearer. As shown in Fig. 3, the direction orthogonal to the longitudinal direction X and the lateral direction Y of the diaper 1 in the unfolded and stretched state is defined as the thickness direction Z.

[0013] As shown in Figures 1 and 5, in the waist portion 10 of the diaper 1 when worn, the lateral direction Y coincides with the circumferential direction of the waist portion. As shown in Figures 2 and 5, in the waist portion 1 when worn, the vertical direction X includes the up-down direction and the front-back direction, and the lateral direction Y, the up-down direction and the front-back direction are orthogonal to each other. In the front-back axis, the front direction means the ventral side, and the back direction means the dorsal side. In the up-down axis, the upward direction means the waist opening 1W side, and the downward direction means the leg opening 1L side (crotch area 9 side). The waist portion 10 is a tubular part in which the dorsal main body portion 61 (described later) and the ventral portion 3 (described later) are joined by a side seal 8 (described later).

[0014] In this specification, "wearing state" means the state in which the diaper 1 is stretched to 75% of its maximum stretched dimensions. "Maximum stretched dimensions" refers to the inner circumference dimension along the lateral direction Y of the waist portion 10 of the diaper 1 when the elastic body placed in the waist portion 10 of the diaper 1 is stretched to its maximum extent. Specifically, as shown in Figure 5, a planar rectangular acrylic plate 28 (for example, 10 mm thick (height)) having an outer circumference of 75% of the above-mentioned maximum stretched dimensions of the diaper 1 is prepared, and the acrylic plate 28 is inserted into the diaper 1 through the waist opening 1W of the diaper 1, and the waist portion 10 is stretched by the acrylic plate 28 to simulate the "wearing state". At this time, as shown in Figure 5, the acrylic plate 28 is inserted into the diaper 1 such that the vertical direction X of the diaper 1 is approximately parallel to the vertical side 28a when the rectangular acrylic plate is viewed from above (when the acrylic plate is viewed in the thickness direction), and the horizontal direction Y of the diaper 1 is parallel to the horizontal side 28b which is perpendicular to the vertical side 28a of the acrylic plate 28. Furthermore, the acrylic plate 28 is inserted into the diaper 1 such that the vertical center line that bisects the dorsal side 6 (described later) and the ventral side 3 of the diaper 1 in the horizontal direction Y is located near the side of the acrylic plate 28, and the side seal 8 is located near the center of the horizontal side 28b of the acrylic plate 28. The "first intersection angle θ1," "second intersection angle θ2," and "third intersection angle θ3," described later, are measurements taken when the acrylic plate 28 is inserted inside the diaper 1 to simulate the "wearing state" of the diaper 1, as shown in Figure 5. At this time, the first virtual line L1, second virtual line L2, third virtual line L3, and fourth virtual line L4, which define each of the above intersection angles θ1 to θ3, are projected onto the plane 28c of the acrylic plate 28, and each intersection angle is measured. Furthermore, if the length of the crotch area 9 (described later) of diaper 1 is relatively short and the acrylic plate 28 cannot be sufficiently inserted into diaper 1, the crotch area 9 is cut along its entire width in the horizontal direction Y near the center of the length in the vertical direction X, and then the acrylic plate 28 is inserted into diaper 1.

[0015] Furthermore, in this specification, "natural length state" means a state in which no external force is applied to the diaper 1 to stretch it.

[0016] 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 transverse direction Y" means the side that is closer to the vertical center line CL that bisects the diaper (pants-type absorbent article) in the transverse direction Y. 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.

[0017] 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."

[0018] As shown in Figures 1 to 3 and Figure 5, 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 the crotch area 9 positioned in the wearer's groin area. The abdominal portion 3 and the dorsal portion 6 are portions that extend from the crotch area 9 in the front-to-back direction in the longitudinal direction X. The absorbent body 4 has a substantially rectangular shape with a longitudinal direction parallel to the longitudinal direction X from the abdominal portion 3 to the dorsal portion 6 of the diaper 1 and a width direction parallel to the transverse direction Y. The diaper 1 also comprises first to third elastic bodies 71 to 73, a leg elastic body 11, and an elastic body 25 for forming a leak-proof cuff.

[0019] Furthermore, the diaper 1 has a pair of side seals 8, each formed by joining the lateral edge 54 of the ventral portion 3 in the lateral direction Y and the lateral edge 55 of the dorsal main body portion 61 of the dorsal portion 6 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 portion 3 and the right lateral edge 55 of the dorsal main body portion 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 portion 3 and the left lateral edge 55 of the dorsal main body portion 61 are joined together by overlapping them in the thickness direction Z. The lateral edge portion 54 of the ventral portion 3 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 portion 3 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.

[0020] As will be described in more detail later, the dorsal portion 6 of diaper 1 is provided with a first dorsal extension 60 and a second dorsal extension 62. The first dorsal extension 60 is the portion of the dorsal portion 6 that protrudes vertically upward X from the ventral portion 3. The second dorsal extension 62 is the portion of the dorsal portion 6 that protrudes vertically downward X from the ventral portion 3.

[0021] Figure 3 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 part 3 and the dorsal part 6 of the side seal 8.

[0022] <Details of each configuration> [Dorsal structure] The back portion 6 is positioned on the wearer's back when worn. As shown in Figures 1 to 4, the back portion 6 has a first back extension portion 60, a back main body portion 61, and a second back extension portion 62. Also, as shown in Figure 3, 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 facing the vertical direction X. The back waist end portion 102 constitutes the waist opening 1W.

[0023] As shown in Figure 4, the first dorsal extension 60 extends in the vertical direction X (up and down direction) from the ventral waist end 101 to the dorsal waist end 102. In diaper 1, the first dorsal extension 60 is the part that protrudes upward from the ventral waist end 101. When wearing diaper 1, the first dorsal extension 60 can prevent leakage of excrement from the dorsal waist side. The second dorsal extension 62 extends in the vertical direction X (up and down direction) from the ventral crotch end 107 to the dorsal crotch end 108 (described later). In diaper 1, the second dorsal extension 62 is the part that protrudes downward from the ventral crotch end 107. When wearing diaper 1, the second dorsal extension 62 can suppress leakage of excrement from the crotch side. The dorsal main body portion 61 is the portion obtained by removing the first dorsal extension portion 60 and the second dorsal extension portion 62 from the dorsal portion 6. The dorsal main body portion 61 is the portion that is in the same position as the ventral portion 3 in the longitudinal direction X, the first dorsal extension portion 60 is the portion that does not face the ventral portion 3 and protrudes upward in the longitudinal direction X, and the second dorsal extension portion 62 is the portion that does not face the ventral portion 3 and protrudes downward in the longitudinal direction X. In this specification, "the ventral portion 3 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 4, the ventral portion 3 and the dorsal main body portion 61 are adjacent to each other and their position and length in the longitudinal direction X coincide.

[0024] As shown in Figure 3, in the unfolded and extended state, the dorsal portion 6 has a rectangular shape, and the first dorsal extension portion 60, the dorsal main body portion 61, and the second dorsal extension portion 62 each have a rectangular shape. As shown in Figure 3, the imaginary line parallel to the lateral direction Y at the boundary between the first dorsal extension portion 60 and the dorsal main body portion 61 is called the first imaginary boundary line 131, and the imaginary line parallel to the lateral direction Y at the boundary between the dorsal main body portion 61 and the second dorsal extension portion 62 is called the second imaginary boundary line 132.

[0025] In diaper 1, the dorsal main body portion 61 is joined to the ventral portion 3 by a side seal 8 to form a tubular waist portion 10. On the other hand, the first dorsal extension 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 free ends, the first dorsal extension side edges 104, on both the left and right sides in the transverse direction Y. Similarly, the second dorsal extension 62 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 free ends, the second dorsal extension side edges 124, on both the left and right sides in the transverse direction Y. The first dorsal extension side edge portion 104 is a portion having a predetermined width that includes the first dorsal extension side edge 1040, which is the side edge (side edge located on the left and right) of the first dorsal extension portion 60 in the lateral direction Y. Similarly, the second dorsal extension side edge portion 124 is a portion having a predetermined width that includes the second dorsal extension side edge 1240, which is the side edge (side edge located on the left and right) of the second dorsal extension portion 62 in the lateral direction Y.

[0026] As shown in Figures 1 to 3, the first dorsal extension 60 may have a pair of first side reinforcing portions 105 provided on each of the pair of first dorsal extension side edges 104. Each of the pair of first dorsal extension side edges 104 extends in the vertical direction X. The second dorsal extension 62 may have a pair of second side reinforcing portions 125 provided on each of the pair of second dorsal extension side edges 124. Each of the pair of second dorsal extension side edges 124 extends in the vertical direction X. The first side reinforcement section 105 and the second side reinforcement section 125 are areas that have been reinforced with increased rigidity. In Figure 3, the area of ​​the side seal 8 is shown filled with dots, and the areas of the first side reinforcement 105 and the second side reinforcement 125 are shown filled with diagonal lines. Details of the first side reinforcement 105, the second side reinforcement 125, and the side seal 8 will be described later.

[0027] The back portion 6 has elastic bodies (first elastic body 71, second elastic body 72, and third elastic body 73) and a back sheet member 5B in which a plurality of thermoplastic sheets are laminated. As shown in Figure 10, it is preferable that the back sheet member 5B 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 back portion 6. The first elastic body 71, the second elastic body 72, and the third elastic body 73 are positioned between the inner layer sheet 52 and the outer layer sheet 51.

[0028] Furthermore, as shown in Figure 10, in the diaper 1 of this embodiment, the dorsal sheet member 5B has a third sheet 53, which is a rectangular, strip-shaped thermoplastic sheet provided on the skin-facing side near the dorsal waist end 102 of a laminate formed by laminating an outer layer sheet 51 and an inner layer sheet 52. The third sheet 53 is arranged across the entire width in the lateral direction Y of the dorsal portion 6. The third sheet 53 is arranged to cover a portion of the first dorsal extension 60 and the dorsal main body 61 in the longitudinal direction X. The laminate and the third sheet 53 are bonded together with an adhesive (typically a hot melt adhesive) 19. The dorsal end of the absorbent body located in the dorsal portion 6, which is the end in the longitudinal direction X of the absorbent body 4 that is fixed across the ventral portion 3 and the dorsal portion 6, is covered by the third sheet 53. As shown in Figure 10, the number of laminated thermoplastic sheets is 3 in the first dorsal extension 60 and 2 in the second dorsal extension 62.

[0029] [Structure of the ventral region] The ventral portion 3 is positioned on the wearer's abdomen when worn. As shown in Figures 1 to 4, in the longitudinal direction X, the ventral portion 3 is in the same position as the dorsal main body portion 61. As shown in Figure 3, in the unfolded and extended state, the ventral portion 3 has a rectangular shape. The ventral portion 3 has a ventral waist end 101 and a ventral crotch end 107 that are opposite the longitudinal direction X. The ventral waist end 101 constitutes the waist opening 1W.

[0030] The ventral portion 3 includes an elastic body (second elastic body 72 and third elastic body 73) and a ventral sheet member 5A formed by laminating a plurality of thermoplastic sheets. As shown in Figure 10, 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 ventral portion 3. The second elastic body 72 and the third elastic body 73 are positioned between the inner layer sheet 52 and the outer layer sheet 51.

[0031] Furthermore, as shown in Figure 10, in the diaper 1 of this embodiment, the ventral sheet member 5A has a third sheet 53, which is a rectangular, strip-shaped thermoplastic sheet provided on the skin-facing side near the ventral waist end 101 of a laminate formed by laminating an outer layer sheet 51 and an inner layer sheet 52. The third sheet 53 is arranged across the entire width in the lateral direction Y of the ventral portion 3. The laminate and the third sheet 53 are bonded together by an adhesive 19. The ventral end of the absorbent body located in the ventral portion 3, which is the end in the longitudinal direction X of the absorbent body 4 fixed across the ventral portion 3 and the dorsal portion 6, is covered by the third sheet 53. As shown in Figure 10, the area near the ventral waist end 101 of the ventral portion 3 of the diaper 1 has a configuration in which three thermoplastic sheets are laminated across the entire width in the lateral direction Y.

[0032] 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.

[0033] [Composition of the absorbent body] As shown in Figures 1 and 3, the absorbent body 4 comprises a liquid-permeable surface sheet 2 that forms the skin side, a liquid-impermeable (including water-repellent) back sheet 7 that forms the non-skin side, 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 side 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.

[0034] As shown in Figure 3, each side of the absorbent body 4 along the longitudinal direction X is provided with a leak-proof cuff 24, each having 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 pulling up the diaper 1, 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.

[0035] As shown in Figure 3, 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.

[0036] As shown in Figure 3, the absorbent body 4 overlaps with the ventral sheet member 5A at its front end in the longitudinal direction X (ventral end of the absorbent body). At the overlapping portion, the two are fixed together via an adhesive (not shown). Similarly, the absorbent body 4 overlaps with the dorsal sheet member 5B at its rear end in the longitudinal direction X (dorsal end of the absorbent body). At the overlapping portion, the two are fixed together via an adhesive (not shown).

[0037] [Configuration of side seal, first side reinforcement section, and second side reinforcement section] The ventral portion 3 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 8, the side seals 8 typically include multiple sealing portions S.

[0038] 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 portion 3 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.

[0039] The pair of first side reinforcing portions 105 are provided on the pair of first back extension side edges 104 of the first back extension portion 60, are continuous with the side seal 8, and extend in a direction including a component in the longitudinal direction X. As shown in Figure 8, the first side reinforcing portions 105 include a plurality of sealing portions S, similar to the side seal 8.

[0040] The pair of second side reinforcing portions 125 are provided on the pair of second back extension side edges 124 of the second back extension portion 62, 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 8, the second side reinforcing portions 125 include a plurality of sealing portions S, similar to the side seal 8.

[0041] In the example shown in Figure 8, 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.

[0042] In the side seal 8 (first side reinforcement portion 105, second side reinforcement portion 125), the rectangular region surrounding the entire 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 (first side reinforcement portion 105, second side reinforcement portion 125) includes a rectangular, relatively rigid high-rigidity region, the seal region B. The rigidity of the first side reinforcement portion 105 is increased by the inclusion of the seal region B, and the first dorsal extension side edge portion 104 is reinforced. The rigidity of the second side reinforcement portion 125 is increased by the inclusion of the seal region B, and the second dorsal extension side edge portion 124 is reinforced.

[0043] As shown in Figure 8, the width range 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 portion 3 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 8, 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.

[0044] As shown in Figure 8, the width range of the rectangular first side reinforcement portion 105 (second side reinforcement portion 125) extending in a band shape in the vertical direction is from the side edge on the inside of the seal area B in the lateral direction Y to the first dorsal extension side edge 1040 (second dorsal extension side edge 1240) of the first dorsal extension portion 60 (second dorsal extension portion 62). The side edge located on the lateral side Y of the first side reinforcement portion 105 (second side reinforcement portion 125) is referred to as the first inner side reinforcement portion side edge 105d (second inner side reinforcement portion side edge 125d). This first inner side reinforcement portion side edge 105d (second inner side reinforcement portion side edge 125d) coincides with the side edge located on the lateral side Y of the seal region B. The side edge located on the lateral Y-outward side of the first side reinforcement portion 105 (second side reinforcement portion 125) is referred to as the first outer side reinforcement portion side edge 105c (second outer side reinforcement portion side edge 125c). This first outer side reinforcement portion side edge 105c (second outer side reinforcement portion side edge 125c) coincides with the first dorsal extension side edge 1040 (second dorsal extension side edge 1240). As shown in Figure 8, each sealing portion S of the first side reinforcement portion 105 (second side reinforcement portion 125) does not reach the first dorsal extension side edge 1040 (second dorsal extension side edge 1240) in the lateral direction Y, and the side edges located on the outside in the lateral direction Y of the sealing region B are located inward in the lateral direction Y than the first dorsal extension side edge 1040 (second dorsal extension side edge 1240). In other words, in the first dorsal extension portion 60 (second dorsal extension portion 62), the respective ranges of the left and right pair of first side reinforcing portions 105 (second side reinforcing portion 125) are the regions located laterally outward from the first inner side reinforcing portion side edge 105d (second inner side reinforcing portion side edge 125d), which is a side edge extending in the vertical direction X and located laterally inward in the lateral direction Y of the rectangular seal region B.

[0045] Since the first side reinforcement portion 105 and the second 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.

[0046] As shown in Figures 6 and 7, a pair of side seals 8 each have an upper end portion 8a and a lower end portion 8b, which constitute both ends in the longitudinal direction X. The upper end portion 8a and the lower end portion 8b of the side seal face each other in the longitudinal direction X. The upper end portion 8a and the lower end portion 8b of the side seal each extend in the transverse direction Y. The upper end portion 8a of the side seal is located on the ventral waist end portion 101 and on the first virtual boundary line 131. The lower end portion 8b of the side seal is located on the ventral crotch end portion 107 and on the second virtual boundary line 132.

[0047] In the continuous side seal 8 and first 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 first 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 end of the side seal 8. In Figure 6, the first boundary portion 110 is virtually shown with a thick dashed line. In the continuous side seal 8 and second 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 second 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 crotch side (leg side) end of the side seal 8. In Figure 7, the second boundary portion 112 is virtually shown with a thick dashed line.

[0048] As shown in Figures 3, 5, and 6, a first point P1 is set on the upper end 8a of the side seal. Specifically, the first point P1 is the outermost point in the lateral direction Y of the upper end 8a of the side seal. This first point P1 is located on the first virtual boundary line 131. Also, as shown in Figures 3, 5, and 7, a second point P2 is set on the lower end 8b of the side seal. Specifically, the second point P2 is the outermost point in the lateral direction Y of the lower end 8b of the side seal. This second point P2 is located on the second virtual boundary line 132.

[0049] As shown in Figures 3 and 5, a midpoint C is set, which is the center of the side seal 8 in the vertical direction X and the outermost point of the side seal 8 in the horizontal direction Y. The straight line passing through this midpoint C and parallel to the vertical direction X is called the "first virtual line L1". The straight line passing through the first point P1 and the second point P2 is called the "second virtual line L2". The extension direction of the second virtual line L2 is approximately the same as the extension direction of the side seal 8.

[0050] As shown in Figures 3, 5, and 6, each pair of first side reinforcements 105 has an upper end portion 105a and a lower end portion 105b, which constitute both ends of the first side reinforcement 105 in the vertical direction X. The upper end portion 105a and the lower end portion 105b each extend in the horizontal direction Y. The upper end portion 105a is located on the back waist end portion 102. The lower end portion 105b is located on the first boundary portion 110 and is in the same position as the upper end portion 8a of the side seal.

[0051] As shown in Figures 3, 5, and 6, a third point P3 is set on the upper end 105a of the first side reinforcement. More specifically, the third point P3 is the outermost point in the lateral direction Y of the back waist end 102. The third point P3 is the outermost point in the lateral direction Y of the upper end 105a of the first side reinforcement. Furthermore, a fourth point P4 is set on the lower end portion 105b of the first side reinforcement section. Specifically, the fourth point P4 is the outermost point in the lateral direction Y of the first virtual boundary line 131. The fourth point P4 is the outermost point in the lateral direction Y of the lower end portion 105b of the first side reinforcement section. The fourth point P4 is in the same position as the first point P1.

[0052] The straight line passing through the third point P3 and the fourth point P4 is referred to as the "third virtual line L3". The direction of the third virtual line L3 roughly corresponds to the direction of extension of the strip-shaped first side reinforcement section 105.

[0053] As shown in Figures 3, 5, and 7, each pair of second side reinforcements 125 has an upper end portion 125a and a lower end portion 125b, which constitute both ends of the second side reinforcement 125 in the vertical direction X. The upper end portion 125a and the lower end portion 125b of the second side reinforcement 125 extend in the horizontal direction Y. The lower end portion 125b of the second side reinforcement 125b is located on the back crotch end portion 108. The upper end portion 125a of the second side reinforcement 125a is located at the second boundary portion 112 and is in the same position as the lower end portion 8b of the side seal.

[0054] As shown in Figures 3, 5, and 7, a fifth point P5 is set on the lower end 125b of the second side reinforcement. More specifically, the fifth point P5 is the outermost point in the lateral direction Y on the back crotch end 108. The fifth point P5 is the outermost point in the lateral direction Y of the lower end 125b of the second side reinforcement. Furthermore, a sixth point P6 is set on the upper end portion 125a of the second side reinforcement section. Specifically, the sixth point P6 is the outermost point in the lateral direction Y of the second virtual boundary line 132. The sixth point P6 is the outermost point in the lateral direction Y of the upper end portion 125a of the second side reinforcement section. The sixth point P6 is in the same position as the second point P2.

[0055] The straight line passing through the fifth point P5 and the sixth point P6 is referred to as the "fourth virtual line L4". The direction of the fourth virtual line L4 roughly corresponds to the direction of extension of the strip-shaped second side reinforcement section 125.

[0056] As shown in Figure 10, the side seal 8, formed by joining the dorsal main body portion 61 and the ventral portion 3, has a first region R1 composed of six thermoplastic sheets joined together, a second region R2 composed of five thermoplastic sheets joined together, and a third region R3 composed of four thermoplastic sheets joined together, arranged in order from top to bottom. The first side reinforcement portion 105, provided on the first dorsal extension portion 60, is constructed by joining together three laminated thermoplastic sheets. The second side reinforcement portion 125, provided on the second dorsal extension portion 62, is constructed by joining two laminated thermoplastic sheets.

[0057] [Examples of elastic body constructions] In the diaper 1 of this embodiment, as shown in Figures 1 to 4, the first dorsal extension 60, the second dorsal extension 62, the dorsal main body 61, and the ventral part 3 each have one or more elastic bodies that extend in the lateral direction Y and are expandable in the lateral direction Y. In the diaper 1, a plurality of first elastic bodies 71, a plurality of second elastic bodies 72, and a plurality of third elastic bodies 73 are arranged as such elastic bodies. The fineness of each of the first to third elastic bodies 71 to 73 is different, and in Figures 1 to 4, elastic bodies with different finenesses are shown with different line types. In Figure 10, the cross-sections of elastic bodies with different finenesses are shown with different hatching. The specific fineness and elongation rate will be described below, but are not limited to these. The method for measuring the elongation rate will be described later.

[0058] As shown in Figure 10, the multiple first to third elastic bodies 71 to 73 are arranged extending in the lateral direction Y between the outer layer sheet 51 and the inner layer sheet 52. These first to third elastic members 71 to 73 provide elasticity to the waist of the diaper 1, making it easier to put on and maintaining a good fit when worn. Furthermore, "the first to third elastic bodies 71 to 73 extend in the lateral direction Y" means that in the unfolded and extended state, the first to third elastic bodies 71 to 73 extend in the lateral direction Y. However, the above expression is not limited to the first to third elastic bodies 71 to 73 being parallel to the lateral direction Y in the unfolded and extended state, but also includes the state in which the whole extends in the lateral direction Y. In this embodiment, an example is given in which all of the elastic bodies 71 to 73 are parallel to the lateral direction Y.

[0059] As shown in Figures 4 and 10, three first elastic bodies 71 are arranged on the back portion 6. Of these three first elastic bodies 71, the two arranged on the first back extension portion 60 are designated with reference numeral 71a, and the remaining first elastic body arranged on the back main body portion 61 is designated with reference numeral 71b. The first elastic body 71b is the elastic body closest to the back waist end portion 102 among the multiple elastic bodies arranged on the back main body portion 61, in other words, the elastic body at the very top of the back main body portion 61. When there is no need to distinguish between the first elastic bodies 71a and 71b, they are referred to as the first elastic body 71. In the figures, the first elastic body 71 is shown by a dashed line. The first elastic bodies 71a and 71b are elastic bodies with a fineness of 470 dtex and an elongation ratio of 3.5 times.

[0060] The second elastic body 72 consists of seven members on the dorsal side 6 and five members on the ventral side 3. Of the seven second elastic bodies 72 arranged on the dorsal portion 6, five are arranged on the dorsal main body portion 61, and the remaining two are arranged on the second dorsal extension portion 62. Of the five second elastic bodies 72 arranged in the dorsal main body portion 61, two are located directly below the first elastic body 71 and are positioned in the upper region of the dorsal main body portion 61, while the remaining three are located directly below the third elastic body 73a (described later) and are positioned in the lower region of the dorsal main body portion 61. The three second elastic bodies 72 located in the upper region of the dorsal main body portion 61 are denoted by the designation 72a. The two second elastic bodies located in the lower region of the dorsal main body portion 61 are denoted by the designation 72b. The two second elastic bodies arranged in the second dorsal extension 62 are denoted by the reference numeral 72c. The five second elastic bodies located in the ventral portion 3 are denoted by the designation 72d. The second elastic bodies 72d are located in the upper region of the ventral portion 3. When there is no need to distinguish between them, the second elastic bodies 72a, 72b, 72c, and 72d are referred to as the second elastic body 72. In the figure, the second elastic body 72 is shown by a dashed line. The second elastic bodies 72a and 72d are elastic bodies with a fineness of 310 dtex and an elongation ratio of 3.5 times. The second elastic bodies 72b and 72c are elastic bodies with a fineness of 310 dtex and an elongation ratio of 3.0 times. In the diaper 1 of this embodiment, the second elastic bodies 72 (72b and 72c) located in the lower region of the diaper 1 have a lower elongation ratio than the second elastic bodies 72 (72a and 72d) located in the upper region of the diaper 1. Here, the shrinkage stress is adjusted by varying the elongation ratios of the elastic bodies, but in addition to or instead of the elongation ratio, the shrinkage stress may also be adjusted by varying the fineness of the elastic bodies and / or the spacing between the elastic bodies.

[0061] Six third elastic bodies 73 are arranged on the dorsal main body portion 61 of the dorsal portion 6, and seven are arranged on the ventral portion 3. The six third elastic bodies 73 arranged in the dorsal main body portion 61 are located directly below the second elastic body 72a and above the second elastic bodies 72 (72b and 72c) located in the lower region of the dorsal main body portion 6. The six third elastic bodies 73 arranged in the dorsal main body portion 61 are denoted by the reference numeral 73a. The seven third elastic bodies located in the ventral portion 3 are denoted by the designation 73b. The third elastic bodies 73b are located in the lower region of the ventral portion 3. When there is no need to distinguish between them, the third elastic body 73a and 73b are referred to as the third elastic body 73. In the figure, the third elastic body 73 is shown by a dashed line. The third elastic bodies 73a and 73b are elastic bodies with a fineness of 780 dtex and an elongation ratio of 3.2 times.

[0062] As shown in Figure 4, the 12 elastic bodies arranged in the dorsal main body 61 and the 12 elastic bodies arranged in the ventral part 3 are, by design, positioned at the same location in the longitudinal direction X. Thus, each elastic body arranged in the dorsal main body 61 may be provided in substantially the same location in the longitudinal direction X as each elastic body arranged in the ventral part 3. "Substantially the same location" means that any design positional deviation that may occur during diaper manufacturing is within 3 mm. Figure 4 shows a state in which no such manufacturing positional deviation occurs.

[0063] The ends of the second elastic body 72d and the third elastic body 73b located on the ventral portion 3, and the first elastic body 71b, the second elastic body 72a, the third elastic body 73a, and the second elastic body 72b located on the dorsal main body portion 61, are preferably located on or near the side seal 8, from the viewpoint of ensuring the overall elasticity of the girth. Specifically, the distance of these ends from the side seal 8 in the lateral direction Y is preferably 10 mm or less, and it is more preferable that the distance is 0 mm and the ends are located within the side seal 8.

[0064] From the viewpoint of ensuring stretchability over almost the entire width of the first back extension 60, both ends of the first elastic body 71a in the longitudinal direction are preferably located at or near the first side reinforcement portion 105. Specifically, it is preferable that the distance of the end from the first 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 first side reinforcement portion 105.

[0065] From the viewpoint of ensuring the stretchability of the second elastic body 72c in the second dorsal extension 62 over almost the entire width in the lateral direction Y of the second dorsal extension 62, it is preferable that both ends in the longitudinal direction be located at or near the second side reinforcement 125. Specifically, it is preferable that the distance of the end from the second side reinforcement 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 second side reinforcement 125.

[0066] The elongation rates of each of the first to third elastic bodies 71 to 73 represent the ratio of the length of the elastic body in the unfolded and stretched state of the pant-type absorbent article to the length of the elastic body in the natural length when removed from the pant-type absorbent article. In other words, the lower the elongation rate, the smaller the elastic force when each elastic body is stretched tends to be. The elongation rate of the elastic body can be adjusted during manufacturing by adjusting the degree of elongation of each elastic body placed in the outer casing 5. 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.

[0067] In the diaper 1 of this embodiment, the back portion 6 has, in order from top to bottom (from the back waist end 102 to the back crotch end 108), three first elastic bodies 71 with a fineness of 470 dtex and an elongation ratio of 3.5 times, two second elastic bodies 72a with a fineness of 310 dtex and an elongation ratio of 3.5 times, six third elastic bodies 73a with a fineness of 780 dtex and an elongation ratio of 3.2 times, and five second elastic bodies 72b and 72c with a fineness of 310 dtex and an elongation ratio of 3.0 times, each extending along the lateral direction Y and intermittently arranged along the longitudinal direction X.

[0068] In the diaper 1 of this embodiment, the abdominal portion 3 has five second elastic bodies 72c with a fineness of 310 dtex and an elongation ratio of 3.5 times, and seven third elastic bodies 73b with a fineness of 780 dtex and an elongation ratio of 3.2 times, extending in the lateral direction Y and intermittently arranged in the longitudinal direction X, in order from top to bottom (from the abdominal waist end 101 to the abdominal crotch end 107).

[0069] When the relative contraction stress per elastic element is expressed as high, medium, or low, the first elastic element 71 (71a, 71b) is medium, the second elastic element 72 (72a-72d) is low, and the third elastic element 73 (73a and 73b) is high. In other words, the relative contraction stress per elastic element is highest for the third elastic element, followed by the first elastic element, and lowest for the second elastic element, following the relationship: third elastic element > first elastic element > second elastic element. The method for measuring the contraction stress per elastic element will be described later. Hereafter, "contraction stress in the lateral direction Y" will be simply referred to as "contraction stress".

[0070] As shown in Figure 4, the dorsal portion 6 has, in order from top to bottom (from the dorsal waist end 102 side to the dorsal crotch end 108 side), a first dorsal region BR1 with a "medium" relative contraction stress where a first elastic body 71 with a "medium" relative contraction stress is located, a second dorsal region BR2 with a "low" relative contraction stress where a second elastic body 72a with a "low" relative contraction stress is located, a third dorsal region BR3 with a "high" relative contraction stress where a third elastic body 73a with a "high" relative contraction stress is located, and a fourth dorsal region BR4 with a "low" relative contraction stress where a second elastic body 72b with a "low" relative contraction stress is located.

[0071] As shown in Figure 4, the ventral portion 3 has, in order from top to bottom (from the ventral waist end 101 side to the ventral crotch end 107 side), a first ventral region FR1 with a "low" relative contractile stress where the second elastic body 72d is located, and a second ventral region FR2 with a "high" relative contractile stress where the third elastic body 73b is located.

[0072] As shown in Figure 4, in the dorsal main body portion 61, the relative contractile stress is approximately "medium," "low," "high," and "low" from top to bottom. In the ventral portion 3, which is joined by the side seal 8 at the same position as the dorsal main body portion 61 in the longitudinal direction X, the relative contractile stress is "low" and "high" from top to bottom. In the longitudinal direction X, the "high" third dorsal region BR3 of the dorsal portion 6 is positioned slightly above the "high" second ventral region FR2 of the ventral portion 3. In the longitudinal direction X, the third dorsal region BR3 and the second ventral region FR2 have parts at the same position, but the third dorsal region BR3 has a part that protrudes above the second ventral region FR2, and the second ventral region FR2 has a part that protrudes below the third dorsal region BR3.

[0073] The first to third elastic bodies 71 to 73, 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 elastic) materials with a rectangular, square, circular, or polygonal cross-section, or multifilament type thread-like materials. The materials for the first to third elastic bodies 71 to 73, 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.

[0074] <Effects and Effects> In this embodiment, the diaper 1 is provided with a first dorsal extension 60 and a second dorsal extension 62 on the upper and lower sides of the dorsal main body 61, respectively. The first dorsal extension 60, the dorsal main body 61, the second dorsal extension 62, and the ventral portion 3 each have one or more elastic bodies (first elastic body 71, second elastic body, third elastic body). As shown in Figure 5, in the worn state of the diaper, the first point P1, which is a point on the upper end 8a of the side seal, is located dorsally more than the second point P2, which is a point on the lower end 8b of the side seal.

[0075] With this configuration, when pulling up diaper 1, excessive pulling up of diaper 1 is suppressed, and even if diaper 1 is pulled up too much or not pulled up enough, it is easier to put diaper 1 in the correct position, and leakage of excrement such as loose stool from the waist side and crotch side of the back can be effectively suppressed. A detailed explanation follows below.

[0076] When worn, the first point P1, which is a point on the upper end 8a of the side seal, is positioned dorsally relative to the second point P2, which is a point on the lower end 8b of the side seal (hereinafter referred to as "configuration A"). As a result, the second imaginary line L2, which is a straight line passing through the first point P1 and the second point P2, is oblique to the first imaginary line L1, which is parallel to the vertical direction X, with its upper side shifted dorsally and its lower side shifted ventrally.

[0077] Generally, infants' abdomens protrude. With diaper 1, by using configuration A, when pulling up, as shown in Figure 5, the lower side seal area A near the lower end 8b of the side seal 8 is more likely to catch on the wearer's protruding abdomen. Therefore, even if the wearer pulls up diaper 1 too far, the lower side seal area A catches on the protruding abdomen, making it difficult for the abdominal crotch end 107 and the dorsal crotch end 108 to lift up excessively, making it easier to wear diaper 1 in the correct position. Thus, in diaper 1, the configuration A makes it easier to suppress excessive pulling during the pulling motion. Therefore, even if diaper 1 is pulled up too far while the excessive pulling suppression effect of the above configuration A is in effect, the length of that pull can be kept shorter than when excessive pulling is not suppressed.

[0078] Furthermore, by providing the second dorsal extension 62 in diaper 1, even if the back of diaper 1 is pulled up too much during the pulling-up motion, while the excessive pulling-up suppression effect of the above configuration (a) is being exerted, the length of the pull-up can be kept short, making it easier to reliably cover the wearer's buttocks with the second dorsal extension 62. Moreover, because the second elastic body 72 is positioned on the second dorsal extension 62, the second dorsal extension 62 fits the buttocks more easily, allowing the second dorsal extension 62 to cover the buttocks in accordance with the shape of the buttocks, and the lateral Y-side portions of the second dorsal extension 62 are more likely to catch on the curve of the buttocks. As a result, excessive pulling up during the pulling-up motion of diaper 1 is more easily suppressed, and diaper 1 can be worn more reliably in the correct position. Furthermore, excessive pulling up makes it less likely for a gap to form between the wearer's skin and the diaper 1 near the leg opening 1L, such as when a part of the buttocks is exposed, and the second dorsal extension 62 can effectively suppress leakage of excrement from the crotch side. Thus, by adopting the above configuration (I) and providing a second dorsal extension 62 having an elastic body, excessive pulling up of the diaper 1 is effectively suppressed, making it easier to put the diaper 1 in the correct position.

[0079] Furthermore, by providing a first dorsal extension 60 that does not form a ring shape in the diaper 1, when pulling up the diaper 1 while grasping the first dorsal extension side edge 104, the fingers of the caregiver grasping the diaper 1 are less likely to be obstructed by the ventral portion 3. As a result, the force with which the caregiver pulls up the diaper 1 is more easily transmitted to the diaper 1, making it easier to pull up quickly and to put the diaper 1 in the correct position. In addition, the first dorsal extension 60 has a first elastic body 71a which allows it to contract in the lateral direction Y, making it easier to increase its thickness and rigidity. This makes the first dorsal extension 60 easier to grasp and pull up, and to put the diaper 1 in the correct position. Thus, by adopting the above configuration (I) and providing the first dorsal extension 60 and the second dorsal extension 62, which are made of elastic material, it becomes easier to put the diaper 1 in the correct position more reliably.

[0080] Furthermore, the first dorsal extension 60, with the first elastic body 71a positioned therein, fits easily to the wearer's back and conforms to the shape of the wearer's back, making it easy to cover the area around the wearer's back waist with almost no gaps. In addition, the first dorsal extension 60 has increased rigidity due to the position of the first elastic body 71a, making it less likely to roll up, thus making it easier to wear the diaper 1 with sufficient area of ​​the first dorsal extension 60 secured, and effectively suppressing leakage of excrement from the waist side.

[0081] Furthermore, since the diaper 1 is provided with a first dorsal extension 60, even if the diaper 1 is not pulled up sufficiently during the pulling-up motion, the first dorsal extension 60 can cover the area around the wearer's waist on their back, thereby suppressing leakage of excrement from the waist area on the back.

[0082] Thus, the diaper 1 is made easier to put on in the correct position by preventing excessive pulling up due to the structure A and the second dorsal extension 62, and the provision of the first dorsal extension 60 makes it even easier to put on the diaper 1 in the correct position. Moreover, with the provision of the first dorsal extension 60 and the second dorsal extension 62, even if the diaper 1 is pulled up too high or not pulled up enough while the excessive pulling-up suppression effect of structure A and the second dorsal extension 62 is being exerted, the area below the wearer's buttocks and the area around the wearer's waist on the back can be covered by the first dorsal extension 60 and the second dorsal extension 62, making it easier to fully exert the excrement leakage suppression effect of the first dorsal extension 60 and the second dorsal extension 62.

[0083] Therefore, even in situations where it is difficult to see the wearer's back, such as when putting on a diaper while the wearer is lying on their back or when putting on diaper 1 in a dimly lit place such as at night while sleeping, the diaper 1 of this embodiment has a first back extension 60 which makes it easier to quickly pull up, and the configuration A and the second back extension 62 prevent excessive pulling up, making it easier to put on diaper 1 in the correct position.

[0084] The above configuration (I) can typically be achieved by adjusting the contraction stress in the lateral direction Y for each elastic body arranged in the dorsal and ventral portions. The contraction stress in the lateral direction Y for each elastic body can be adjusted by the fineness and / or elongation rate of the elastic body. Specific examples of configurations for achieving configuration (I) will be described later.

[0085] <Relationship of contractile stress between the uppermost elastic body of the dorsal main body and the uppermost elastic body of the ventral side> It is preferable that the contraction stress in the lateral direction Y per strand of the first elastic body 71b, which is the uppermost elastic body of the dorsal main body 61, is greater than the contraction stress in the lateral direction Y per strand of the second elastic body 72d, which is the uppermost elastic body of the ventral part 3 (referred to as "configuration B"). By using configuration B, it is easier to design to achieve configuration A described above.

[0086] With this configuration, the area near the ventral waist end 101 of the ventral portion 3 is more easily pulled dorsally by the contractile force of the first elastic body 71b (the uppermost elastic body of the dorsal main body 61) located near the first virtual boundary line 131 of the dorsal main body 61, and the first point P1 is more likely to be located dorsally, making it easier to design the above configuration A.

[0087] In the diaper 1 of this embodiment, the fineness of the first elastic body 71b located at the uppermost part of the dorsal main body 61 is higher than that of the second elastic body 72d located at the uppermost part of the ventral part 3, and the elongation rate of the first elastic body 71b is equal to that of the second elastic body 72d located at the uppermost part of the ventral part 3. The contraction stress per elastic body is higher for the first elastic body 71b than for the second elastic body 72d.

[0088] Here, in a diaper, there are two, for example, ways to make the width of the dorsal waist end 102 (length in the lateral direction Y) shorter than the width of the ventral waist end 101 to achieve the above configuration A. The first method is to make the width of the dorsal waist end 102 and the width of the ventral waist end 101 equal when fully extended, as in diaper 1 of this embodiment, and to have the above configuration B. In this method, only the contraction stress of each elastic body used is adjusted. The second method involves making the width of the dorsal waist end 102 narrower than the width of the ventral waist end 101 when fully extended, and making the contraction stress of each elastic body equal between the uppermost elastic body of the dorsal main body and the uppermost elastic body of the ventral part. This method adjusts only the width of the ventral waist end 101 and the dorsal waist end 102 when fully extended. The first method described above allows for more precise adjustment of the contraction stress near the ventral waist end 101 and the dorsal waist end 102 to achieve the above configuration (I), and is easier to design than the second method described above. Therefore, it is preferable to adopt the first means as in the diaper 1 of this embodiment, and by adopting the first means, the above configuration (i) can be achieved simply and with high precision, making it easier to put on the diaper 1 in the appropriate position.

[0089] <Relationship of contractile stress between the lowest elastic body in the dorsal main body and the lowest elastic body in the ventral side> It is preferable that the contraction stress in the lateral direction Y per strand of the second elastic body 72b, which is the elastic body at the very bottom of the dorsal main body portion 61, is smaller than the contraction stress in the lateral direction Y per strand of the third elastic body 73b, which is the elastic body at the very bottom of the ventral portion 3 (referred to as "configuration C"). By using configuration C, it is easier to design to achieve configuration A as described above.

[0090] In the diaper 1 of this embodiment, the width (length in the lateral direction Y) of the dorsal crotch end 108 at maximum extension is made equal to the width of the ventral crotch end 107, and the above configuration C is used, and only the contraction stress of each elastic body at the lowest part of the dorsal main body 61 and the ventral part 3 is adjusted. Alternatively, when fully extended, the width of the dorsal crotch end 108 may be made wider than the width of the ventral crotch end 107, and the contraction stress per elastic body may be made equal between the elastic body at the lowest end of the dorsal main body 61 and the elastic body at the lowest end of the ventral part 3, and only the widths of the dorsal crotch end 108 and the ventral crotch end 107 may be adjusted. However, adjusting only the contraction stress per elastic body, as in the diaper 1 of this embodiment, allows for more precise adjustment of the contraction stress near the ventral crotch end 107 and the dorsal crotch end 108 than adjusting only the width of the dorsal crotch end 108 and the ventral crotch end 107, thus simplifying the design and making it preferable.

[0091] With this configuration, the area near the second virtual boundary line 132 of the dorsal main body portion 61 is more easily pulled ventrally by the contractile force of the third elastic body 73b (the lowest elastic body of the dorsal main body portion 61) located near the ventral crotch end 107 of the ventral portion 3, and the second point P2 is more likely to be located ventrally, making it easier to design the garment to have the above configuration A.

[0092] In the diaper 1 of this embodiment, the fineness of the second elastic body 72b located at the bottom of the dorsal main body portion 61 is lower than that of the third elastic body 73b located at the bottom of the ventral portion 3, and the elongation rate of the second elastic body 72b located at the bottom of the dorsal main body portion 61 is lower than that of the third elastic body 73b located at the bottom of the ventral portion 3. As a result, the contraction stress per elastic body is lower for the second elastic body 72b than for the third elastic body 73b.

[0093] In this embodiment, the diaper 1 has configuration B and configuration C, making it easier to design to have configuration A as described above. As a result, when the diaper 1 is pulled up, the lower area A of the side seal 8 is more likely to catch on the protrusion of the stomach, effectively suppressing excessive pulling up of the diaper 1, and making it less likely for the buttocks to protrude due to excessive pulling up of the diaper 1.

[0094] Furthermore, either configuration B or configuration C may be adopted to achieve configuration A. In this case, if configuration C is adopted, it is preferable to make the contraction stress per elastic element at the uppermost end of the dorsal main body 61 equal to the contraction stress per elastic element at the uppermost end of the ventral part 3, from the viewpoint of making it easier to adopt configuration A. Furthermore, when adopting configuration B, it is preferable to make the contraction stress per elastic element at the lowest end of the dorsal main body 61 equal to the contraction stress per elastic element at the lowest end of the ventral part 3, from the viewpoint of making it easier to adopt configuration A.

[0095] <Positional relationship between the third dorsal region BR3 and the second ventral region FR2> Both the third dorsal region BR3 and the second ventral region FR2 are regions with high contractile stress, as they contain a third elastic body 73 that has a higher contractile stress than the elastic bodies in other regions. As shown in diaper 1 in Figure 4, it is preferable that the third dorsal region BR3 is positioned slightly above the second ventral region FR2 in the longitudinal direction X. In the longitudinal direction X, the third dorsal region BR3 and the second ventral region FR2 have portions in the same position, but the third dorsal region BR3 has a portion that protrudes above the second ventral region FR2, and the third dorsal region BR3 has a portion that protrudes below the second ventral region FR2. This configuration is referred to as "configuration D".

[0096] By adopting configuration 2, it becomes even easier to design configuration 1 above.

[0097] In other words, the two third elastic bodies 73a located at the uppermost part of the third dorsal region BR3 and the elastic body of the ventral region 3 located at the same position in the longitudinal direction X are second elastic bodies 72d, which have a lower contractile stress than the third elastic bodies 73a. In the region where these elastic bodies exist, the area is more easily pulled dorsally by the contractile force of the third elastic body 73a. On the other hand, the two third elastic bodies 73b located at the lowest part of the second ventral region FR2 and the elastic body of the dorsal region 6, which are in the same position in the longitudinal direction X, are second elastic bodies 72b, which have lower contractile stress than the third elastic bodies 73b. In the region where these elastic bodies exist, the area is more easily pulled ventrally by the contractile force of the third elastic bodies 73b.

[0098] In this embodiment of diaper 1, in addition to configurations B and C, configuration D is also used to make it easier to design for configuration A. Furthermore, configuration B or C and configuration D may also be used, and in this case as well, it will still be easier to design for configuration A.

[0099] <First intersection angle> The first intersection angle θ1 between the first virtual line L1 and the second virtual line L2 is preferably between 2 degrees and 45 degrees, and more preferably between 5 degrees and 35 degrees.

[0100] By setting the first crossing angle θ1 to 2 degrees or more, more preferably 5 degrees or more, the dorsal extension portion 60 can be gathered on the dorsal side so that its length in the lateral direction Y is shortened. When the dorsal extension portion 60 is grasped and the diaper 1 is pulled up, the pulling force is less likely to be dispersed, and the pulling force can be applied efficiently to the dorsal extension portion 60. This makes it easier to pull up the diaper 1, and the lower side seal region A of the side seal 8 is more likely to catch on the protrusion of the stomach, which can more effectively suppress excessive pulling up of the diaper 1 and make it easier to put the diaper 1 in the correct position. In addition, generally speaking, in diaper 1, the length of the lateral Y direction between the dorsal and ventral parts when fully extended is

[0101] By setting the first intersection angle θ1 to 45 degrees or less, more preferably 35 degrees or less, it is easier to ensure a sufficient length in the vertical direction X near the first dorsal extension side edge 104, making it easier for the caregiver to grasp the area near the first dorsal extension side edge 104 when pulling up the diaper 1, thus making it easier to pull up the diaper 1. Furthermore, by setting the first intersection angle θ1 to 45 degrees or less, more preferably 35 degrees or less, it is easier to ensure a sufficient area of ​​the first dorsal extension 60, so that the area around the waist on the back can be sufficiently covered, and the effect of suppressing leakage of excrement can be fully exerted.

[0102] <First side reinforcement section and second side reinforcement section> By providing the first side reinforcement portion 105 and the second side reinforcement portion 125, the rigidity of the first dorsal extension side edge portion 104 and the second dorsal extension side edge portion 124 can be increased and reinforced.

[0103] When pulling up diaper 1, the caregiver typically grasps the first dorsal extension 60 and pulls up diaper 1. By providing highly rigid first side reinforcements 105 on both the left and right sides of the first dorsal extension 60, the area around the first dorsal extension side edge 104 becomes easier to grasp when pulling up diaper 1, making it easier to grasp the first dorsal extension side edge 104 and pull up, thus making it easier to put on diaper 1 in a more appropriate position. In addition, the presence of highly rigid first side reinforcements 105 makes it less likely for the first dorsal extension side edge 104 to fold towards the wearer or to roll up on the opposite side of the wearer during the pulling-up motion, making it easier to ensure sufficient surface area of ​​the first dorsal extension 60 relative to the wearer and to position the first dorsal extension 60 in the appropriate position. As a result, the effect of suppressing leakage of excrement from the waist side by the first dorsal extension 60 is more easily achieved.

[0104] By providing the second side reinforcement portion 125 and increasing the rigidity of the second dorsal extension side edge portion 124, the second dorsal extension portion 62 becomes less likely to curl up, and the effect of suppressing leakage of excrement from the crotch side by the second dorsal extension portion 62 is more easily achieved.

[0105] <Relationship between the first and second crossing angles when worn> As shown in Figure 5, when worn, it is preferable that the second intersection angle θ2, which is the intersection angle between the first virtual line L1 and the third virtual line L3, is greater than the first intersection angle θ1, which is the intersection angle between the first virtual line L1 and the second virtual line L2. In this way, by making the inclination of the third virtual line L3, which corresponds to the approximate extending direction of the first side reinforcement portion 105, with respect to the first virtual line L1 (corresponding to the second intersection angle θ2), larger than the inclination of the second virtual line L2, which corresponds to the approximate extending direction of the side seal 8, with respect to the first virtual line L1 (corresponding to the first intersection angle θ1), the first dorsal extension portion 60 is more likely to be positioned closer to the dorsal side. As a result, when lifting the diaper 1, it becomes easier to grasp the first dorsal extension portion 60 and pull it upward.

[0106] From the viewpoint of ensuring sufficient area of ​​the first dorsal extension 60 while making it easier to grasp and lift the first side reinforcing portion 105, the second intersection angle θ2 is preferably 5 degrees or more and 70 degrees or less, and more preferably 10 degrees or more and 60 degrees or less. From the viewpoint of making it easier to position the first dorsal extension 60 together on the dorsal side and to make it easier to pull upward, the difference between the first intersection angle θ1 and the second intersection angle θ2 is preferably 2 degrees or more and 50 degrees or less, and more preferably 5 degrees or more and 40 degrees or less.

[0107] <Position of the back edge near the crotch when worn> As shown in Figures 5 and 7 of this embodiment, it is preferable that when worn, the crotch-side end 108 on the back is positioned further back than the lower end 8b of the side seal. This configuration further suppresses excessive pulling up of the diaper 1, making it easier to put on the diaper 1 in the correct position. Specifically, the lower side seal region A of the side seal 8 catches on the wearer's protruding abdomen, further suppressing excessive pulling up of the diaper 1, and the lateral Y sides of the second dorsal extension 62 where the second elastic body 72c is located are more likely to catch on the bulge of the buttocks, thereby suppressing excessive pulling up of the diaper 1.

[0108] <Relationship between the longitudinal lengths of the first dorsal extension and the second dorsal extension> The length of the first dorsal extension 60 in the vertical direction X is preferably 0.5 to 2 times the length of the second dorsal extension 62 in the vertical direction X, and more preferably 0.7 to 1.7 times. This configuration prevents one of the first dorsal extension 60 and the second dorsal extension 62 from being excessively long compared to the other, making it easier to achieve both good ease of lifting and suppression of excessive lifting during the lifting operation.

[0109] In the diaper 1 of this embodiment, as shown in Figure 3, when unfolded and extended, both the first dorsal extension portion 60 and the second dorsal extension portion 62 are rectangular in shape, and are strips of equal width with the same length in the vertical direction X along the horizontal direction Y.

[0110] Refer to Figure 4. In diaper 1, the length d1 of the first dorsal extension 60 in the vertical direction X (i.e., the length from the first virtual boundary line 131 to the dorsal waist end 102) is preferably, for example, 10 mm to 40 mm, from the viewpoint of good pulling-up operation of the diaper, effective suppression of the first dorsal extension 60 rolling up, and effective suppression of leakage of excrement from the dorsal waist side even if the diaper 1 is not pulled up sufficiently.

[0111] The length in the vertical direction X of the first dorsal extension 60 refers to its minimum length. As shown in Figure 3, if the dorsal waist end 102 is a straight line parallel to the horizontal direction Y, the length in the vertical direction X of the first dorsal extension 60 (the length from the dorsal waist end 102 to the first virtual boundary line 131 in the vertical direction X) is equal across the entire width in the horizontal direction Y. However, if, for example, the dorsal waist end 102 is a curved shape that is convex upward in the vertical direction X, the length in the vertical direction X of the first dorsal extension 60 will not be equal across the entire width in the horizontal direction Y. In such a configuration, the length of the part of the first dorsal extension 60 where the length in the vertical direction X is minimized (minimum length) is defined as the "length in the vertical direction X of the first dorsal extension 60".

[0112] The longer the first dorsal extension 60, the better it can prevent loose stools and other excrement from leaking out from the first dorsal extension 60. However, if it is too long, it becomes difficult to pull up the diaper 1, and the first dorsal extension 60 is more likely to curl up. Therefore, it is preferable that the length of the first dorsal extension 60 be 40 mm or less. On the other hand, if the first dorsal extension 60 is too short, it is easy for the first dorsal extension 60 to be folded inward by hand when pulling up the diaper 1, making it difficult to pull up. Therefore, it is preferable that the length of the first dorsal extension 60 be 10 mm or more.

[0113] Refer to Figure 4. The length d2 of the second dorsal extension 62 in the vertical direction X (i.e., the length from the second virtual boundary line 132 to the dorsal crotch end 108) is preferably, for example, 10 mm to 40 mm, from the viewpoint of effectively suppressing excessive pulling up of the diaper, effectively suppressing the curling of the second dorsal extension 62, and effectively suppressing leakage of excrement from the crotch side even if the diaper 1 is pulled up too much. The length in the longitudinal direction X of the second dorsal extension 62 refers to the minimum length, similar to the first dorsal extension 60. The longer the second dorsal extension 62, the better it can prevent loose stools and other excrement from leaking out from the second dorsal extension 62. However, if it is too long, the second dorsal extension 62 gets in the way when pulling up the diaper, making it difficult to pull up. Also, the wearer's movements during wearing can easily cause the second dorsal extension 62 to roll up, which can hinder the wearer's movements and induce leakage. Therefore, the length of the second dorsal extension 62 is preferably 40 mm or less. On the other hand, if the second dorsal extension 62 is too short, when the diaper 1 is pulled up too far, it is difficult to adequately cover the wearer's buttocks with the second dorsal extension 62, making it difficult to effectively suppress leakage of excrement from the crotch area. Therefore, the length of the second dorsal extension 62 is preferably 10 mm or more.

[0114] <Relationship between the second and third crossing angles when worn> The first virtual line L1 is a straight line parallel to the vertical direction X, the third virtual line L3 is approximately coincident with the extension direction of the first side reinforcement section 105, and the fourth virtual line L4 is approximately coincident with the extension direction of the second side reinforcement section 125.

[0115] As shown in Figure 5, when worn, it is preferable that the second intersection angle θ2, which is the intersection angle between the first virtual line L1 and the third virtual line L3, is greater than the third intersection angle θ3, which is the intersection angle between the first virtual line L1 and the fourth virtual line L4. In other words, it is preferable that the inclination with respect to the first virtual line L1 is greater for the first side reinforcement portion 105 than for the second side reinforcement portion 125.

[0116] With this configuration, the sheets constituting the first dorsal extension 60 tend to gather towards the inside in the lateral direction Y near the dorsal waist end 102 of the first dorsal extension 60, making it easier to grasp the first dorsal extension 60. This allows for a firm grasp of the first dorsal extension 60 even with weak force, enabling the diaper 1 to be pulled up and, consequently, to be fitted in the correct position. Here, caregivers are expected to be male or female, and of all age groups, some with strong pulling strength and others with weak strength. By making the first dorsal extension 60 easier to grasp with the above configuration, it becomes easier for any caregiver to stably and properly put on the diaper 1.

[0117] From the viewpoint of making it easier for the diaper 1 to catch on the bulge of the buttocks and suppressing excessive pulling up of the diaper 1, the third crossing angle θ3 is preferably 3 degrees or more and 60 degrees or less, and more preferably 5 degrees or more and 50 degrees or less.

[0118] <Relationship between lateral contraction stress of the first dorsal extension and the second dorsal extension> It is preferable that the first dorsal extension 60 has a higher lateral Y-stress than the second dorsal extension 62. The method for measuring the shrinkage stress of the first dorsal extension 60 and the second dorsal extension 62 will be described later. This configuration makes it easier to design the diaper to match the above configuration (I). Furthermore, because there is no ventral portion at the same position in the longitudinal direction X, the contractile stress of the first dorsal extension 60, which is not ring-shaped, is relatively increased. This allows the first dorsal extension 60 to contract inward in the transverse direction Y, increasing its thickness and making it more robust, and easier to grasp and pull upward. In addition, by relatively lowering the contractile stress of the second dorsal extension 62, when the wearer thrashes around and moves their legs during wear, the second dorsal extension 62, where the second elastic body 72c is located, is less likely to move above the top of the buttocks, exposing the buttocks. This allows the diaper 1 to be worn in the correct position.

[0119] In the diaper 1 of this embodiment, the first dorsal extension portion 60 is provided with a first elastic body 71 having a relatively "medium" shrinkage stress per unit, and the second dorsal extension portion 62 is provided with a second elastic body 72c having a relatively "small" shrinkage stress per unit, resulting in a configuration where the first dorsal extension portion 60 has a higher lateral Y shrinkage stress than the second dorsal extension portion 62.

[0120] Examples of contraction stress in the lateral direction Y for the first dorsal extension 60 and the second dorsal extension 62 are given below, but the values ​​are not limited to those given here. The shrinkage stress of the first dorsal extension 60 is preferably 10 cN / 10 mm or more and 60 cN / 10 mm or less, and more preferably 15 cN / 10 mm or more and 50 cN / 10 mm or less. The shrinkage stress of the second dorsal extension 62 is preferably 5 N / 10 mm or more and 50 cN / 10 mm or less, and more preferably 10 N / 10 mm or more and 45 cN / 10 mm or less.

[0121] <Relationship between the elongation rate of the elastic material in the first dorsal extension and the elongation rate of the elastic material in the second dorsal extension> Preferably, the elongation rate of the first elastic body 71, which is arranged in the first dorsal extension portion 60, is higher than the elongation rate of the second elastic body 72c, which is arranged in the second dorsal extension portion 62. This configuration allows the first dorsal extension 60 to have a higher contractile stress in the lateral direction Y than the second dorsal extension 62, making it easier to design the diaper to have the above configuration A. In addition, because there is no ventral portion at the same position in the longitudinal direction X, the contractile stress of the first dorsal extension 60, which is not ring-shaped, is relatively higher. This makes the first dorsal extension 60 more likely to contract inward in the lateral direction Y, increasing its thickness and making it more robust, and easier to grasp and pull up. Furthermore, by relatively lowering the contractile stress of the second dorsal extension 62, when the wearer thrashes around and moves their legs during wear, the second dorsal extension 62, where the second elastic body 72c is located, is less likely to move above the top of the buttocks, exposing the buttocks, thus allowing the diaper 1 to be worn in the correct position.

[0122] In the diaper 1 of this embodiment, as an example, the first elastic body 71a arranged in the first dorsal extension portion 60 is an elastic body with a fineness of 470 dtex and an elongation ratio of 3.5 times. The second elastic body 72c is an elastic body with a fineness of 310 dtex and an elongation ratio of 3.0 times.

[0123] <Relationship between the thickness of the first dorsal extension and the second dorsal extension> As in diaper 1 of this embodiment, it is preferable that the first dorsal extension 60 is thicker than the second dorsal extension 62. In this way, by making the thickness of the first dorsal extension 60 relatively thicker, the first dorsal extension 60 becomes more robust, making it easier to grasp and pull up. Also, by making the thickness of the second dorsal extension 62 relatively thinner, the bending rigidity of the second dorsal extension 62 is reduced, and in the area around the buttocks, which has a higher curvature than the back, the second dorsal extension 62 conforms more easily to the skin, resulting in a better fit and making it less likely for undesirable gaps to form between the second dorsal extension 62 and the skin. This makes it easier to suppress leakage of excrement from the crotch area.

[0124] In the diaper 1 of this embodiment, the number of layers of thermoplastic sheets constituting the first dorsal extension 60 is greater than the number of layers of thermoplastic sheets constituting the second dorsal extension 62, so that the first dorsal extension 60 is thicker than the second dorsal extension 62. Specifically, as shown in Figure 10, in diaper 1, the number of layers of sheets in the first dorsal extension 60 is 3, while the number of layers of sheets in the second dorsal extension 62 is 2. By changing the number of layers of sheets used in this configuration, the thickness can be easily altered.

[0125] Furthermore, as shown in Figure 2, in the diaper 1 of this embodiment, it is preferable that the first dorsal extension portion 60 is provided with vertical folds 67 that extend continuously in the vertical direction. In the diaper 1, vertical folds are provided on both the dorsal portion 6 and the ventral portion 3. The provision of vertical folds increases cushioning, resulting in a better feel against the skin, and also increases thickness, making it easier to grasp and pull up the first dorsal extension portion 60 during the pulling-up motion. In addition, the provision of vertical folds 67 provides excellent breathability, resulting in a comfortable wearing experience.

[0126] The vertical folds 67 can be formed, for example, by partially joining the outer layer sheet 51 and the inner layer sheet 52, which are multiple thermoplastic sheets constituting the dorsal sheet member 5B, as will be explained with reference to Figure 9. Similarly, the vertical folds 67 provided on the ventral portion 3 can also be formed by partially joining the outer layer sheet 51 and the inner layer sheet 52, which constitute the ventral sheet member 5A.

[0127] As shown in Figure 9, the dorsal sheet member 5B is joined to the outer sheet 51 and the inner sheet 52 by a joint 58 consisting of a partially provided heat seal. The joint 58 is intermittently arranged in both the longitudinal X and transverse Y directions. Multiple elastic bodies (elastic bodies 71-73 in Figure 9) are arranged so as not to pass through the joint 58. Each of the multiple elastic bodies is joined to the outer sheet 51 and the inner sheet 52 only at the ends in the longitudinal direction of the first side reinforcement portion 105 or its vicinity, only at the side seal 8 or its vicinity, or only at the second side reinforcement portion 125 or its vicinity, and is not joined to the outer sheet 51 and the inner sheet 52 in the central part in the longitudinal direction. The same applies to the ventral sheet member 5A.

[0128] In the ventral sheet member 5A and dorsal sheet member 5B with this configuration, the outer sheet 51 and the inner sheet 52 each form a plurality of vertical folds 67 that extend continuously in the longitudinal direction X across a plurality of elastic bodies in the natural state and the worn state of the diaper 1. The vertical folds 67 are formed on both sides of the laminate of the outer sheet 51 and the inner sheet 52, or on both sides of the laminate of the outer sheet 51, the inner sheet 52 and the third sheet.

[0129] The first dorsal extension 60 (second dorsal extension 62) of diaper 1 is positioned in contact with the wearer's skin near the waist (crotch area) when worn. In diaper 1 of this embodiment, the first elastic body 71a (second elastic body 72c) of the first dorsal extension 60 (second dorsal extension 62) is joined to both sheets (outer layer sheet 51 and inner layer sheet 52) ​​only at both ends in its longitudinal direction (in diaper 1, each elastic body is arranged so that its longitudinal direction is parallel to the transverse direction Y), and the rest of the length in the center is not joined to either sheet. Therefore, in diaper 1, compared to a diaper in which the elastic body is fixed to the sheet over its entire surface, the contraction of the elastic body is less likely to be hindered by the sheet when it contracts. By joining and fixing the elastic body to the sheet only at both ends in its longitudinal direction, and leaving the rest unfixed to the sheet, a high elongation rate can be easily obtained, simplifying the design.

[0130] In addition, in the first dorsal extension portion 60 (second dorsal extension portion 62) of the diaper 1 of this embodiment, the joint portion 58 is formed by heat sealing, so there is no adhesive between the outer sheet 51 and the inner sheet 52, except for the portion where both ends of the first elastic body 71a (second elastic body 72c) are joined to the sheet. In this way, the absence of adhesive between the outer sheet 51 and the inner sheet 52 in the first dorsal extension portion 60 (second dorsal extension portion 62) makes the first dorsal extension portion 60 (second dorsal extension portion 62) soft to the touch, further improving skin contact and providing excellent fit.

[0131] In the diaper 1 of this embodiment, the dorsal main body portion 61 and the ventral portion 3, like the first dorsal extension portion 60 and the second dorsal extension portion 62, have their longitudinal central portions not fixed to both sheets, and there is no adhesive between the two sheets, resulting in a soft and comfortable feel against the skin.

[0132] In this embodiment, an example is given in which the joint portion 58 is formed by heat sealing, but the joint portion 58 may be formed by other joining means, for example, by hot melt adhesive. From the viewpoint of providing a better feel against the skin, it is more preferable to form the joint portion 58 by heat sealing, as in the diaper 1 of this embodiment.

[0133] In this embodiment of diaper 1, an example was given in which the elastic bodies are not fixed to the outer layer sheet 51 and the inner layer sheet 52 except at both ends of each elastic body. However, each elastic body may be intermittently fixed to the outer layer sheet and the inner layer sheet in its longitudinal direction, and such a configuration may form vertical folds.

[0134] <Method for measuring the elongation rate of an elastic material> Diaper 1 is separated at the side seal 8 and unfolded, then stretched. Two marks are made on each elastic body using an oil-based pen, spaced apart La in the stretching direction, in the area not including the side seal 8. Next, each elastic body is peeled off diaper 1, and the length Lb between the two marks in the natural state (contracted state) of each elastic body is measured. This measurement is performed three times for each elastic body, and the elongation rate is determined by the arithmetic mean of the values ​​calculated using the formula "La / Lb". The spacing La can be, for example, 100 mm, but if the stretchable range is less than 100 mm, the spacing La should be as wide as possible.

[0135] <Method for measuring the lateral Y-force contraction stress per elastic body> In diaper 1, the contraction stress in the lateral direction Y for each elastic body arranged parallel to the lateral direction Y is measured as follows.

[0136] [Measurement sample] Peel off the side seal of the diaper, stretch and unfold it as shown in Figure 3 to spread it flat, and cut out the area containing each elastic body to be measured along a straight line parallel to the transverse direction Y (diaper width direction) to obtain a strip or band-shaped sample. When cutting, cut the entire diaper, including the absorbent body 4, not just the ventral part 3 and the dorsal part 6, to remove the absorbent material 40. Alternatively, after removing the absorbent material 40, the ventral part 3 and the dorsal part 6 may be cut into their respective parts. For example, in the diaper 1 of this embodiment, a sample in which the first elastic body 71b located at the uppermost part of the back main body portion 61 is positioned was obtained by cutting the diaper 1 along a first cutting line that crosses the center of the vertical X dimension of the spacing between the first elastic body 71a (the first elastic body 71a located at the lowermost part of the first back extension portion 60) located immediately above the first elastic body 71b and the first elastic body 71b, and a second cutting line that crosses the center of the vertical X dimension of the spacing between the second elastic body 72a located immediately below the first elastic body 71b and the first elastic body 71b. The length (mm) in the vertical X and horizontal Y directions of each cut-out sample was recorded. The length (horizontal Y length) (mm) between the side seals 8 of each cut-out sample is measured using the internal dimensions when the sheet constituting the outer casing is not contracted by the elastic material (in other words, when only the ventral part 3 and dorsal part 6 are extended without the elastic material).

[0137] <Method for measuring shrinkage stress in the first and second dorsal extensions> The shrinkage stress of the first dorsal extension 60 and the second dorsal extension 62 is measured as the shrinkage stress in the Y direction per unit length, as follows.

[0138] [Measurement sample] The side seal of the diaper is peeled off, and as shown in Figure 3, it is stretched and unfolded to spread it flat. The areas of the first dorsal extension 60 and the second dorsal extension 62 are cut along straight lines parallel to the lateral direction of the diaper to obtain a strip or band-shaped sample that spans the entire lateral width between the two side edges 55 of the dorsal portion 6. When cutting, the entire diaper, including the absorbent body 4, is cut, not just the dorsal portion 6, and then the absorbent body 4 is removed. Alternatively, the absorbent body 4 may be removed before cutting out the first dorsal extension 60 and the second dorsal extension 62. If an elastic body exists at the boundary between adjacent parts, the elastic body at the boundary is to be placed in the upper part (waist side part), and the cut is made in a part other than the adjacent elastic body. For example, if an elastic body exists at the boundary between the first dorsal extension 60 and the dorsal body 61, the elastic body is to be placed in the first dorsal extension 60. Record the length (in mm) of each cut sample in the vertical (X) and horizontal (Y) directions.

[0139] [Measurement of contraction stress in the lateral Y direction] 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 on the dorsal side, measured using the inner dimensions of the dorsal side, 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 defined as the contraction stress P in the Y direction. The reason for specifying the return force at a length equivalent to 71 when the inner dimensions of the ventral and dorsal sides are set to 100 is that the waist circumference of infants, the primary target of wearing diaper 1 in this embodiment, is approximately 71% of the inner dimensions of the diaper. The abdominal circumference referred to here is the average value of the abdominal circumference measured in standing and sitting positions, taking into account the change in abdominal circumference when the posture of the infant changes. Each pair of first side reinforcement parts 105 (or second side reinforcement parts 125) has a first inner side reinforcement part side edge 105d (second inner side reinforcement part side edge 125d) located on the inner side in the lateral direction Y, and the above "internal dimensions" refer to the distance between the pair of first inner side reinforcement part side edges 105d (second inner side reinforcement part side edge 125d). Furthermore, the above "internal dimensions" refer to the internal dimensions when the back sheet member 5B of the back side part 6 is not contracted by the elastic body, in other words, when only the back side part is extended without the elastic body.

[0140] 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.

[0141] For example, in the above embodiment, a pant-type diaper with a divided ventral and dorsal portion 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 side of an outer body in which the ventral portion, dorsal portion, and crotch portion located between the ventral and dorsal portions are integrated, and the absorbent main body is stretched across the dorsal and ventral portions.

[0142] Furthermore, the pant-type absorbent article according to the present 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 the present invention does not have to be a disposable diaper, as long as it is an absorbent article of the type worn on the lower body. Examples of such pant-type absorbent articles include pant-type sanitary napkins.

[0143] 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 that is facing the ventral waist end in the longitudinal direction, The back portion has a back waist end that constitutes the waist opening, and a back crotch end that is facing the back waist end in the longitudinal direction, The dorsal waist end is located further from the pair of leg openings in the longitudinal direction than the ventral waist end, The aforementioned dorsal crotch end is located further from the waist opening in the longitudinal direction than the aforementioned ventral crotch end, The dorsal portion is, A first dorsal extension extending from the ventral waist end to the dorsal waist end in the longitudinal direction, A second dorsal extension extends in the longitudinal direction from the ventral crotch end to the dorsal crotch end, The dorsal main body portion obtained by removing the first dorsal extension portion and the second dorsal extension portion from the dorsal portion, It has, The first dorsal extension, the second dorsal extension, the dorsal main body, and the ventral portion each have one or more elastic bodies that extend in the lateral direction and are expandable in the lateral direction. The ventral portion and the dorsal main body portion are joined together to form a pair of side seals. The side seal has an upper end and a lower end that are opposite to each other in the longitudinal direction and extend in the lateral direction, When worn, the first point, which is the outermost point in the lateral direction of the upper end of the side seal, is located dorsally to the second point, which is the outermost point in the lateral direction of the lower end of the side seal. Absorbent pants. <2> When the side seal is worn, if a first imaginary line parallel to the vertical direction is set, passing through the midpoint which is the center of the side seal in the vertical direction and the outermost point of the side seal in the horizontal direction, the first intersection angle, which is the intersection angle between the first imaginary line and the second imaginary line which is a straight line passing through the first and second points, is between 2 degrees and 45 degrees. The aforementioned <1> The pant-type absorbent article described above. <3> The first dorsal extension is, A pair of first dorsal extending side edges, each facing each other in the lateral direction and extending in the vertical direction, A pair of first side reinforcing portions provided on each of the pair of first dorsal extension side edges and It has, The second dorsal extension is, A pair of second dorsal extension side edges facing each other in the lateral direction, each extending in the vertical direction, A pair of second side reinforcing portions provided on each of the pair of second dorsal extension side edges and has The aforementioned <1> or <2> The pant-type absorbent article described above. <4> The first side reinforcement portion and the second side reinforcement portion are continuous with the side seal, The first side reinforcement portion and the second side reinforcement portion include a plurality of sealing portions formed by pressurizing means and / or heating means. The aforementioned <3> The pant-type absorbent article described above. <5> Of the multiple elastic bodies arranged in the dorsal main body, the elastic body closest to the dorsal waist end has a higher lateral contraction stress than the multiple elastic bodies arranged in the ventral side that are closest to the ventral waist end. The aforementioned <1> ~ <4> A pant-type absorbent article described in any one of the following. <6> Of the multiple elastic bodies arranged in the ventral portion, the elastic body closest to the ventral crotch end has a higher lateral contraction stress than the multiple elastic bodies arranged in the dorsal main body that are closest to the dorsal crotch end. The aforementioned <1> ~ <5> A pant-type absorbent article described in any one of the following. <7> A second imaginary line is set, which is a straight line passing through the first point and the second point. When a third virtual line is defined, which is a straight line passing through the third point, which is the outermost point in the lateral direction of the back waist end of the first back extension, and the fourth point, which is the outermost point in the lateral direction of the first virtual boundary line parallel to the lateral direction at the boundary between the first back extension and the back main body, When worn, the first intersection angle, which is the intersection angle between the first virtual line and the second virtual line, is smaller than the second intersection angle, which is the intersection angle between the first virtual line and the third virtual line. The aforementioned <1> ~ <6> A pant-type absorbent article described in any one of the following. <8> When worn, the aforementioned crotch-side end on the back is positioned further back than the lower end of the side seal. The aforementioned <1> ~ <7> A pant-type absorbent article described in any one of the following. <9> The longitudinal length of the first dorsal extension is 0.5 times or more and 2 times or less the longitudinal length of the second dorsal extension. The aforementioned <1> ~ <8> A pant-type absorbent article described in any one of the following. <10> A third virtual line is defined, which is a straight line passing through the third point, which is the outermost point in the lateral direction of the dorsal waist end, and the fourth point, which is the outermost point in the lateral direction of the first virtual boundary line parallel to the lateral direction at the boundary between the first dorsal extension and the dorsal main body. When a fourth virtual line is defined, which is a straight line passing through the fifth point, which is the outermost point in the lateral direction of the dorsal crotch end, and the sixth point, which is the outermost point in the lateral direction of the second virtual boundary line parallel to the lateral direction at the boundary between the second dorsal extension and the dorsal main body, When worn, the second intersection angle, which is the intersection angle between the first virtual line and the third virtual line, is greater than the third intersection angle, which is the intersection angle between the first virtual line and the fourth virtual line. The aforementioned <1> ~ <9> A pant-type absorbent article described in any one of the following. <11> The first dorsal extension has a higher lateral shrinkage stress than the second dorsal extension. The aforementioned <1> ~ <10> A pant-type absorbent article described in any one of the following. <12> The shrinkage stress of the first dorsal extension is 10 cN / 10 mm or more and 60 cN / 10 mm or less. The shrinkage stress of the second dorsal extension is 5 N / 10 mm or more and 50 cN / 10 mm or less. The aforementioned <1> ~ <11> A pant-type absorbent article described in any one of the following. <13> The elastic body located in the first dorsal extension has a higher elongation rate than the elastic body located in the second dorsal extension. The aforementioned <1> ~ <12> A pant-type absorbent article described in any one of the following. <14> The first dorsal extension is thicker than the second dorsal extension. The aforementioned <1> ~ <13> A pant-type absorbent article described in any one of the following. <15> The first dorsal extension and the second dorsal extension are each constructed by laminating multiple sheets. The first dorsal extension has a larger number of sheet layers than the second dorsal extension. The aforementioned <1> ~ <14> A pant-type absorbent article described in any one of the following. <16> The first dorsal extension has folds that are continuous in the longitudinal direction. The aforementioned <1> ~ <15> A pant-type absorbent article described in any one of the following. <17> Multiple elastic bodies are arranged in the first dorsal extension, the second dorsal extension, the dorsal main body, and the ventral portion. The plurality of elastic bodies include first to third elastic bodies with different finenesses from each other. The first elastic body is disposed in the first dorsal extension, The second elastic body is disposed in the second dorsal extension, The main body on the back is arranged in the following order from the back waist end towards the back crotch end: a first elastic body, a second elastic body, a third elastic body, and a second elastic body. The second elastic body and the third elastic body are arranged in the ventral portion in order from the ventral waist end towards the ventral crotch end. The aforementioned <1> ~ <16> A pant-type absorbent article described in any one of the following. <18> Two of the first elastic bodies are arranged in the first dorsal extension. Two of the second elastic bodies are arranged in the second dorsal extension. The main body on the back is arranged in the following order from the back waist end towards the back crotch end: one first elastic body, two second elastic bodies, six third elastic bodies, and two second elastic bodies. In the ventral portion, five second elastic bodies and seven third elastic bodies are arranged in order from the ventral waist end towards the ventral crotch end. The aforementioned <17> The pant-type absorbent article described above. <19> The relative contraction stress per elastic body is such that the third elastic body > the first elastic body > the second elastic body. The aforementioned <17> or <18> The pant-type absorbent article described above. <20> The first elastic material is an elastic material with a fineness of 470 dtex and an elongation ratio of 3.5 times. The two second elastic bodies arranged on the back waist end side of the back main body and the second elastic body arranged on the ventral side are elastic bodies with a fineness of 310 dtex and an elongation ratio of 3.5 times. The two elastic bodies arranged on the back crotch end of the back main body and the second elastic body arranged on the second back extension are elastic bodies with a fineness of 310 dtex and an elongation ratio of 3.0 times. The third elastic body arranged on the ventral side is an elastic body with a fineness of 780 dtex and an elongation ratio of 3.2 times. The aforementioned <19> The pant-type absorbent article described above. <21> The dorsal portion has, in order from the dorsal waist end to the dorsal crotch end, a first dorsal region with moderate relative contractile stress, a second dorsal region with low relative contractile stress, a third dorsal region with high relative contractile stress, and a fourth dorsal region with low relative contractile stress. The aforementioned <1> ~ <20> A pant-type absorbent article described in any one of the following. <22> The ventral portion has, in order from the ventral waist end to the ventral crotch end, a first ventral region with low relative contractile stress and a second ventral region with high relative contractile stress. The aforementioned <1> ~ <21> A pant-type absorbent article described in any one of the following. <23> The longitudinal length of the first dorsal extension is 0.5 times or more and 2 times or less the longitudinal length of the second dorsal extension. The aforementioned <1> ~ <22> A pant-type absorbent article described in any one of the following. <24> The dorsal and ventral portions are provided with longitudinal folds that are continuous in the longitudinal direction. The vertical folds provided on the dorsal and ventral portions are formed by partially joining the outer sheet and the inner sheet. The aforementioned <1> ~ <23> A pant-type absorbent article described in any one of the following. <25> The outer casing is formed by integrating the ventral portion, the dorsal portion, and the crotch portion located between the ventral portion and the dorsal portion. The absorbent body is fixed to the skin-facing side of the outer casing by being spanned between the dorsal and ventral portions. The aforementioned <1> ~ <24> A pant-type absorbent article described in any one of the following. [Explanation of symbols]

[0144] 1. Absorbent pants (disposable diapers, diapers) 1W…Waist opening 1L... Leg opening 3...ventral part 4… Absorbent body 6…Dorsal part 8... Side seal 8a... Upper end of side seal 8b... Lower end of side seal 54...Lateral margin of the ventral part 55...Lateral edge of the dorsal portion 60…First dorsal extension part 61...Dorsal body part 62…Second dorsal extension part 71...First elastic body (elastic body) 72...Second elastic body (elastic body) 73...Third elastic body (elastic body) 101...Ventral waist end 102...Rear waist end 107...Ventral end near the crotch 108...Rear end near the crotch P1…1st point P2…Second point

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 that is facing the ventral waist end in the longitudinal direction, The back portion has a back waist end that constitutes the waist opening, and a back crotch end that is facing the back waist end in the longitudinal direction, The dorsal waist end is located further from the pair of leg openings in the longitudinal direction than the ventral waist end, The aforementioned dorsal crotch end is located further from the waist opening in the longitudinal direction than the aforementioned ventral crotch end, The dorsal portion is, A first dorsal extension extending from the ventral waist end to the dorsal waist end in the longitudinal direction, A second dorsal extension extends in the longitudinal direction from the ventral crotch end to the dorsal crotch end, The dorsal body portion obtained by removing the first dorsal extension and the second dorsal extension from the dorsal portion, It has, The first dorsal extension, the second dorsal extension, the dorsal main body, and the ventral portion each have one or more elastic bodies that extend in the lateral direction and are expandable in the lateral direction. The ventral portion and the dorsal main body portion are joined together to form a pair of side seals. The side seal has an upper end and a lower end that are opposite to each other in the longitudinal direction and extend in the lateral direction, When worn, the first point, which is the outermost point in the lateral direction of the upper end of the side seal, is located dorsally to the second point, which is the outermost point in the lateral direction of the lower end of the side seal. Absorbent pants.

2. When the side seal is worn, if a first imaginary line parallel to the vertical direction is set, passing through the midpoint which is the center of the side seal in the vertical direction and the outermost point of the side seal in the horizontal direction, the first intersection angle, which is the intersection angle between the first imaginary line and the second imaginary line which is a straight line passing through the first and second points, is between 2 degrees and 45 degrees. The pant-type absorbent article according to claim 1.

3. The first dorsal extension is, A pair of first dorsal extending side edges that face each other in the lateral direction and each extends in the vertical direction, A pair of first side reinforcing portions provided on each of the pair of first dorsal extension side edges and It has, The second dorsal extension is, A pair of second dorsal extending side edges, each facing each other in the lateral direction and extending in the vertical direction, A pair of second side reinforcing portions provided on each of the pair of second dorsal extension side edges and has The pant-type absorbent article according to claim 1 or 2.

4. Of the multiple elastic bodies arranged in the dorsal main body, the elastic body closest to the dorsal waist end has a higher lateral contraction stress than the multiple elastic bodies arranged in the ventral side that are closest to the ventral waist end. The pant-type absorbent article according to claim 1 or 2.

5. Of the multiple elastic bodies arranged in the ventral portion, the elastic body closest to the ventral crotch end has a higher lateral contraction stress than the multiple elastic bodies arranged in the dorsal main body that are closest to the dorsal crotch end. The pant-type absorbent article according to claim 1 or 2.

6. A second imaginary line is set, which is a straight line passing through the first point and the second point. When a third virtual line is defined, which is a straight line passing through the third point, which is the outermost point in the lateral direction of the back waist end of the first back extension, and the fourth point, which is the outermost point in the lateral direction of the first virtual boundary line parallel to the lateral direction at the boundary between the first back extension and the back main body, When worn, the first intersection angle, which is the intersection angle between the first virtual line and the second virtual line, is smaller than the second intersection angle, which is the intersection angle between the first virtual line and the third virtual line. The pant-type absorbent article according to claim 1 or 2.

7. When worn, the aforementioned crotch-side end on the back is positioned further back than the lower end of the side seal. The pant-type absorbent article according to claim 1 or 2.

8. The longitudinal length of the first dorsal extension is 0.5 times or more and 2 times or less the longitudinal length of the second dorsal extension. The pant-type absorbent article according to claim 1 or 2.

9. A third virtual line is defined, which is a straight line passing through the third point, which is the outermost point in the lateral direction of the dorsal waist end, and the fourth point, which is the outermost point in the lateral direction of the first virtual boundary line parallel to the lateral direction at the boundary between the first dorsal extension and the dorsal main body. When a fourth virtual line is defined, which is a straight line passing through the fifth point, which is the outermost point in the lateral direction of the dorsal crotch end, and the sixth point, which is the outermost point in the lateral direction of the second virtual boundary line parallel to the lateral direction at the boundary between the second dorsal extension and the dorsal main body, When worn, the second intersection angle, which is the intersection angle between the first virtual line and the third virtual line, is greater than the third intersection angle, which is the intersection angle between the first virtual line and the fourth virtual line. The pant-type absorbent article according to claim 1 or 2.

10. The first dorsal extension has a higher lateral shrinkage stress than the second dorsal extension. The pant-type absorbent article according to claim 1 or 2.

11. The elastic body located in the first dorsal extension has a higher elongation rate than the elastic body located in the second dorsal extension. The pant-type absorbent article according to claim 1 or 2.

12. The first dorsal extension is thicker than the second dorsal extension. The pant-type absorbent article according to claim 1 or 2.

13. The first dorsal extension and the second dorsal extension are each constructed by laminating multiple sheets. The first dorsal extension has a larger number of sheet layers than the second dorsal extension. The pant-type absorbent article according to claim 1 or 2.

14. The first dorsal extension has folds that are continuous in the longitudinal direction. The pant-type absorbent article according to claim 1 or 2.

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