Absorbent panty-type items

Abstract

This relates to absorbent pant-type items that can be disposed of hygienically and compactly. [Solution] One embodiment of the absorbent pants comprises an absorbent body and an outer casing. The outer casing has a waist opening and leg openings. The outer casing has a ventral portion having an ventral waist end and a dorsal portion having a dorsal waist end. The dorsal waist end is located further from the leg openings in the longitudinal direction than the ventral waist end. The dorsal portion has a dorsal extension and a dorsal main body portion. The absorbent pants comprises a disposal tape fixed to the non-skin-facing surface of the dorsal portion for securing the garment during disposal. The absorbent body has an absorbent body front end region and an absorbent body rear end region. The dorsal portion has a first fold portion which serves as the starting point for folding with the skin-facing surface facing inward. The longitudinal length of the first region from the first fold portion of the dorsal portion to the dorsal waist end is greater than or equal to the sum of the thickness of the absorbent body front end region after swelling and the thickness of the absorbent body rear end region after swelling.

Description

Technical Field

[0001] The present invention relates to pants-type absorbent articles such as disposable diapers.

Background Art

[0002] A pants-type absorbent article generally includes an absorbent main body, an exterior body, and side seals where the ventral exterior body and the dorsal exterior body are joined at their side end portions. By joining the ventral exterior body and the dorsal exterior body via the side seals, the waist portion of the pants-type absorbent article is formed. Further, the pants-type absorbent article is provided with a disposal tape for maintaining a compact shape obtained by rolling up the used pants-type absorbent article with the ventral side facing inward.

[0003] Patent Documents 1 and 2 disclose pants-type absorbent articles having a dorsal extension portion on the dorsal waist side of the exterior body. With such a configuration, for example, excreta such as loose stool is prevented from leaking from the dorsal side.

Prior Art Documents

Patent Documents

[0004]

Patent Document 1

Patent Document 2

Summary of Invention

Problems to be Solved by the Invention

[0005] When rolling up and discarding a pants-type absorbent article after defecation, pressure is applied to the pants-type absorbent article, and stool may jump out and stain the hands of the person disposing of it. On the other hand, if the pants-type absorbent article is rolled loosely to prevent the stool from jumping out, it cannot be compactly bundled and its bulk increases.

[0006] This invention relates to a pant-type absorbent article that can be disposed of hygienically and compactly. [Means for solving the problem]

[0007] One embodiment of the present invention comprises an absorbent pant-type article, an absorbent body, and an outer casing. The outer casing described above is positioned on the non-skin-facing side of the absorbent body and has a waist opening and a pair of leg openings. 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 outer casing has a ventral portion and a dorsal portion. The ventral portion described above is positioned on the wearer's ventral side and has a ventral waist end that constitutes the waist opening described above. The aforementioned back portion is positioned on the wearer's back and has a back waist end that constitutes the waist opening. The dorsal waist end is located further from the pair of leg openings in the longitudinal direction than the ventral waist end. The dorsal portion of the exterior body has a dorsal extension and a dorsal main body. The dorsal extension extends in the longitudinal direction from the ventral waist end to the dorsal waist end. The dorsal main body portion described above is the portion obtained by removing the dorsal extension portion described above from the dorsal portion described above. The exterior body has a pair of side seals, which are formed by joining the lateral edge of the ventral portion and the lateral edge of the dorsal main body portion in the lateral direction. The above-mentioned pant-type absorbent article is equipped with a disposal tape for securing the wearer during disposal, which is fixed to the non-skin-facing side of the back portion. The absorbent body has an anterior region of the absorbent body located on the ventral side and a posterior region of the absorbent body located on the dorsal side. The dorsal portion has a first fold portion that extends laterally and serves as the starting point for a fold with the skin-facing surface facing inward. The longitudinal length of the first region, which is the area from the first bend in the dorsal portion to the dorsal waist end, is greater than or equal to the sum of the thickness of the front end region of the absorbent body after swelling and the thickness of the rear end region of the absorbent body after swelling.

[0008] One embodiment of the present invention comprises an absorbent pant-type article, an absorbent body, and an outer casing. The outer casing described above is positioned on the non-skin-facing side of the absorbent body and has a waist opening and a pair of leg openings. 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 outer casing has a ventral portion and a dorsal portion. The ventral portion described above is positioned on the wearer's ventral side and has a ventral waist end that constitutes the waist opening described above. The aforementioned back portion is positioned on the wearer's back and has a back waist end that constitutes the waist opening. The dorsal waist end is located further from the pair of leg openings in the longitudinal direction than the ventral waist end. The dorsal portion of the exterior body has a dorsal extension and a dorsal main body. The dorsal extension extends in the longitudinal direction from the ventral waist end to the dorsal waist end. The dorsal main body portion described above is the portion obtained by removing the dorsal extension portion described above from the dorsal portion described above. The exterior body has a pair of side seals, which are formed by joining the lateral edge of the ventral portion and the lateral edge of the dorsal main body portion in the lateral direction. The above-mentioned pant-type absorbent article is equipped with a disposal tape for securing the wearer during disposal, which is fixed to the non-skin-facing side of the back portion. The absorbent body has an anterior region of the absorbent body located on the ventral side and a posterior region of the absorbent body located on the dorsal side. The dorsal portion has a first fold portion that extends laterally and serves as the starting point for a fold with the skin-facing surface facing inward. The first region, which is the region from the first bent portion of the back side portion to the back side waist end portion, includes the back side extension portion. When the pants-type absorbent article having the swollen absorbent main body is folded in two, and the back side portion is folded from the first bent portion with the skin-facing surface facing inward, the back side extension portion covers the ventral side waist end portion. [Effects of the Invention]

[0009] According to the pants-type absorbent article of the present invention, it can be disposed of in a hygienic and compact manner. [Brief Description of the Drawings]

[0010] [Figure 1] (A) is a schematic side view showing a wearer wearing the pants-type absorbent article according to the first embodiment of the present invention, and (B) is a partially enlarged view of the region enclosed by the circle IB in FIG. 1(A). [Figure 2] (A) is a schematic plan view of the pants-type absorbent article as viewed from the ventral side portion, and (B) is a schematic plan view of the pants-type absorbent article as viewed from the back side portion. [Figure 3] It is a schematic plan view showing the skin-facing surface of the pants-type absorbent article of the first embodiment, and is a diagram showing a state where the pants-type absorbent article is unfolded and each elastic body is stretched to spread into a flat shape. [Figure 4] It is an enlarged cross-sectional view of the disposal tape of the pants-type absorbent article. [Figure 5] It is a schematic side view of the pants-type absorbent article in a two-fold form before use. [Figure 6] It is a schematic side view of the used pants-type absorbent article in a two-fold form, and is a diagram showing a state where the absorbent main body has increased in thickness due to absorption of urine, and the ventral side waist end portion is covered by the back side extension portion. [Figure 7](A) is a schematic side view showing a state where the used pants-type absorbent article is rolled up and is about to be fastened with an extended disposal tape, and (B) is a schematic side view of the pants-type absorbent article in a disposal form after being fastened with the disposal tape. [Figure 8] It is a schematic perspective view of the pants-type absorbent article in the disposal form shown in FIG. 7(B). [Figure 9] It is a schematic partial cross-sectional view near the waist opening of the used pants-type absorbent article in a two-folded form, showing a state before the ventral waist end portion is covered by the back-side extension portion. [Figure 10] It is a schematic partial cross-sectional view near the waist opening of the used pants-type absorbent article in a two-folded form, and is a diagram showing a state immediately before the rolled-up pants-type absorbent article is fastened with a disposal tape to form a disposal form. [Figure 11] It is a schematic plan view showing a side seal and a side reinforcing portion. [Figure 12] It is a schematic side view of the pants-type absorbent article according to the second embodiment in a two-folded form before use. [Figure 13] It is a schematic side view of the pants-type absorbent article according to the second embodiment in a used two-folded form, showing a state where the thickness of the absorbent main body is increased due to urine absorption, and the ventral waist end portion and the outer surface of the ventral portion near the ventral waist end portion are covered by the back-side extension portion. [Figure 14] It is a schematic partial cross-sectional view near the waist opening of the pants-type absorbent article according to the second embodiment in a used two-folded form, showing a state before the ventral waist end portion and the outer surface of the ventral portion near the ventral waist end portion are covered by the back-side extension portion. [Figure 15] It is a schematic partial cross-sectional view near the waist opening of the pants-type absorbent article according to the second embodiment in a used two-folded form, and is a diagram showing a state where the non-skin facing surface near the ventral waist end portion of the ventral waist end portion and the ventral portion is covered by the back-side extension portion. [Figure 16]This is a schematic partial cross-sectional view of a used pair of absorbent pants related to a modified example, showing the state before the ventral waist end and the outer surface near the ventral waist end of the ventral portion are covered by the dorsal extension. [Figure 17] This is a schematic perspective view showing the disposal method of the pant-type absorbent article according to the second embodiment and modified examples. [Modes for carrying out the invention]

[0011] Embodiments of the present invention will be described below with reference to the drawings. Note that previously described components will be denoted by the same reference numerals, and their descriptions may be omitted.

[0012] <First Embodiment>

[0013] [Overall composition of absorbent pant-type garments] Figures 1(A), 2(A) and (B), and 3 show a pant-type disposable diaper 1 as a pant-type absorbent article according to the first embodiment of the present invention. The pant-type disposable diaper 1 will be referred to as diaper 1 below. Figure 1(A) schematically shows diaper 1 when worn, and the wearer's torso 33 and legs 34 are also shown. Figure 3 shows diaper 1 unfolded, with the elastic bodies of each part stretched out, and spread out into a flat plane to the design dimensions in a state where the influence of the elastic bodies is completely eliminated. This form is also referred to as the "unfolded and stretched state" of diaper 1. Unfolding diaper 1 means separating the ventral part 3 and the dorsal part 6 of the side seal 8, which will be described later.

[0014] As shown in Figure 1(A), the diaper 1 has a waist opening 1W and a pair of leg openings 1L, and is worn around the wearer's waist and crotch. The waist opening 1W has a waist opening end Wa. The diaper 1 has a vertical direction X and a horizontal direction Y. The vertical direction X extends from the wearer's ventral side through the crotch area to the dorsal side. The horizontal direction Y is perpendicular to the vertical direction X and corresponds to the wearer's left-right direction. Furthermore, as shown in Figure 3, the direction perpendicular to the vertical direction X and the horizontal direction Y of the diaper 1 is defined as the thickness direction Z.

[0015] In this specification, "waist side" and "upper side" mean the side in the vertical direction X that is closer to the waist opening end Wa of the waist opening 1W and away from the leg opening 1L. "Leg side" and "lower side" mean the side in the vertical direction X that is away from the waist opening end Wa and closer to the leg opening 1L. In this specification, "inside of the lateral Y direction" means the side in the lateral Y direction that approaches the vertical center line CL1 that divides the diaper (pants-type absorbent article) in the lateral Y direction. "inside of the vertical X direction" means the side in the vertical X direction that approaches the lateral center line CL2 that divides the diaper (pants-type absorbent article) in the vertical X direction, and "outside of the vertical X direction" means the side that moves away from the horizontal center line CL2. 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. In this specification, "plan view" means a plan view taken from the thickness direction Z.

[0016] As shown in Figures 2(A) and (B) and Figure 3, the diaper 1 comprises an absorbent body 4 and an outer casing 5 positioned on the non-skin-facing side of the absorbent body 4. The diaper 1 also includes an elastic body 70 positioned around the waist, an elastic body 21 for the legs, and an elastic body 25 for forming a leak-proof cuff.

[0017] The elastic body 70, the leg elastic body 21, and the leak-proof cuff forming elastic body 25 can preferably be thread-like (e.g., elastic thread) or string-like (e.g., flat rubber) with a rectangular, square, circular, or polygonal cross-section, or multifilament type thread-like material. The materials for the elastic body 70, the leg elastic body 21, 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.

[0018] As shown in Figures 1(A), 2(A) and (B), and 3, the outer body 5 has a ventral portion 3, a dorsal portion 6, and a crotch portion 9 positioned between the ventral portion 3 and the dorsal portion 6. The dorsal portion 6 of the outer body 5 of the diaper 1 includes a dorsal extension portion 60 that protrudes vertically upward from the ventral portion 3, and a dorsal main body portion 61 obtained by removing the dorsal extension portion 60 from the dorsal portion 6.

[0019] Furthermore, as shown in Figure 2(B), the diaper 1 is further equipped with a disposal tape 10 having a handle portion, which is positioned on the back side 6 so as to overlap with the absorbent body 4 in a plan view. As shown in Figures 7 and 8, when disposing of a used diaper 1, the used diaper 1, which has been folded in half, is rolled up, and this rolled shape is maintained by fastening it with the disposal tape 10, allowing the diaper 1 to be compactly stored in its disposal form.

[0020] In the diaper 1 of this embodiment, when disposed of, the dorsal portion 6 folds inward from the first fold portion 81 with the skin-facing surface facing inward, and the dorsal extension portion 60 covers the ventral waist end portion 101 (described later). With this configuration, the area between the dorsal portion 6 and the ventral portion 3 near the waist opening is covered by the dorsal extension portion 60, and the dorsal extension portion 60 acts as a lid to prevent feces 80 between the dorsal portion 6 and the ventral portion 3 from spilling out (see Figure 10). Further details will be described later.

[0021] In this specification, a "folded in half" diaper refers to a diaper in which the ventral portion 3 and the dorsal main body portion 61 of the side seal 8 are separated, the ventral portion 3 and the dorsal main body portion 61 are overlapped with their skin-facing surfaces facing inward, the crotch area 9 is folded in the middle of the vertical X direction, and the ventral waist end 101 and the boundary portion 103 between the dorsal extension portion 60 and the dorsal main body portion 61 are in the same position in the vertical X direction.

[0022] [Exterior structure] As shown in Figures 1(A), 2(A) and (B), and 3, the outer garment 5 comprises at least an abdominal portion 3 positioned on the wearer's abdominal side and a dorsal portion 6 positioned on the wearer's back side. The outer garment 5 of this embodiment further includes a crotch portion 9 located between the abdominal portion 3 and the dorsal portion 6 and positioned in the wearer's crotch area. In this example, the abdominal portion 3, the crotch portion 9, and the dorsal portion 6 are arranged along the longitudinal direction X. The outer garment 5 also has a shape that is constricted inward in the transverse direction Y at the crotch portion 9. This forms a leg opening 1L that follows the wearer's leg opening.

[0023] The ventral portion 3 of the outer casing 5 has a ventral waist end 101 that constitutes the waist opening end Wa of the waist opening 1W. The dorsal portion 6 of the outer casing 5 has a dorsal waist end 102 that constitutes the waist opening end Wa of the waist opening 1W. The dorsal waist end 102 is located further from the pair of leg openings 1L in the longitudinal direction X than the ventral waist end 101. The dorsal waist end 102 is the end (dorsal extension end) of the dorsal extension portion 60. In the illustrated example, the dorsal waist end 102 is a straight line extending in the transverse direction Y, but is not limited to this, and may be a curved shape (rounded shape) that gently bulges upward in the longitudinal direction X, for example. The outer edge of the exterior body 5 is preferably constructed to be symmetrical (left-right symmetrical) with respect to the vertical center line CL1.

[0024] As shown in Figures 2 and 3, the outer casing 5 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 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 with the thickness direction Z overlapping. 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 with the thickness direction Z overlapping. 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.

[0025] The outer casing 5 is preferably a laminate including, for example, an outer layer sheet 51 and an inner layer sheet 52 as a plurality of thermoplastic sheets 50, as shown in Figure 9. The outer layer sheet 51 is positioned on the non-skin side of the inner layer sheet 52 and constitutes the non-skin facing surface of the outer casing 5. Preferably, a plurality of elastic bodies 70 are arranged between the inner layer sheet 52 and the outer layer sheet 51, extending in the lateral direction Y. These elastic bodies 70 provide elasticity around the waist of the diaper 1, making it easier to put on and maintaining a good fit when worn. Furthermore, "the elastic body 70 extends in the lateral direction Y" means that the elastic body 70 extends in the lateral direction Y when unfolded and extended. However, the above expression is not limited to the elastic body 70 being parallel to the lateral direction Y when unfolded and extended, but also includes the configuration in which the entire body extends in the lateral direction Y.

[0026] The thermoplastic sheet 50 is a sheet material mainly composed of thermoplastic resin. The thermoplastic sheet 50 preferably contains 90% by mass or more of thermoplastic resin, and more preferably consists of 100% by mass of thermoplastic resin. In addition, multiple thermoplastic sheets 50 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.

[0027] (Composition of the dorsal side) The back portion 6 is positioned on the wearer's back when worn. 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. The back waist end portion 102 constitutes the waist opening 1W. As shown in Figures 1(A), 2(A) and (B), and 3, the back portion 6 of the outer body 5 has a back extension portion 60 and a back main body portion 61.

[0028] The dorsal extension 60 extends in the longitudinal direction X from the ventral waist end 101 to the dorsal waist end 102. In diaper 1, the dorsal extension 60 is a portion that protrudes upward from the ventral waist end 101 and suppresses leakage of excrement from the dorsal waist area of ​​diaper 1.

[0029] The dorsal main body portion 61 is the portion obtained by removing the dorsal extension portion 60 from the dorsal portion 6. The dorsal main body portion 61 is the portion that is in the same position as the ventral portion 3 in the longitudinal direction X, while the dorsal extension portion 60 is the portion that does not face the ventral portion 3 and protrudes upward in the longitudinal direction X. As shown in Figure 3, the reference numeral 103 is used to indicate the boundary between the dorsal extension portion 60 and the dorsal main body portion 61 (shown by a hypothetical dashed line).

[0030] 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, 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.

[0031] As shown in Figure 1(A), in the 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. On the other hand, the dorsal extension portion 60 is not ring-shaped because there is no portion of the ventral portion at the same position in the longitudinal direction X, and is provided with a pair of dorsal extension side edges 104 on both the left and right sides in the transverse direction Y, which are free ends facing the transverse direction Y. Each of the pair of dorsal extension side edges 104 extends in the longitudinal direction X. As shown in Figure 3, the dorsal extension side edge portion 104 is a portion having a predetermined width that includes the dorsal extension side edge 1040, which is the side edge (side edge located on the left and right) of the dorsal extension portion 60 in the lateral direction Y. The width of the dorsal extension side edge portion 104 is preferably 1.5 mm or more and 10 mm or less, more preferably 2 mm or more and 8 mm or less.

[0032] As shown in Figures 3 and 5, the dorsal portion 6 has a first fold portion 81. The first fold portion 81 is the part of the dorsal portion 6 that is easily folded when the diaper 1 is disposed of in the form shown in Figures 7(B) and 8, and extends in the lateral direction Y when unfolded and extended. As shown in Figure 5, the region of the dorsal portion 6 from the first fold portion 81 to the dorsal waist end 102 is called the first region R1.

[0033] Figure 6 shows a configuration in which the dorsal extension portion 60 included in the first region R1 of the folded diaper 1 is folded toward the ventral portion 3 at the first fold portion 81. As shown in Figures 6, 7(A) and (B), the first bend 81 is the starting point for the bend toward the ventral portion 3 with the skin-facing surface of the dorsal portion 6 facing inward. As shown in Figure 7(B), when the dorsal portion 6 bends from the first bend 81, the dorsal extension 60 included in the first region R1 covers the ventral waist end 101 of the rolled-up diaper 1 in its discarded form. The first bend 81 will be described later.

[0034] As shown in Figures 1 and 3, the dorsal extension 60 may have a pair of side reinforcing portions 105 provided on each of the pair of dorsal extension side edges 104. Each of the pair of dorsal extension side edges 104 extends in the longitudinal direction X. The side reinforcing portions 105 are reinforced portions with increased rigidity. In Figure 3, the area of ​​the side seal 8 is shown filled with dots, and the area of ​​the side reinforcement portion 105 is shown filled with diagonal lines. Details of the side reinforcement portion 105 and the side seal 8 will be described later.

[0035] (Composition of the ventral part) The ventral portion 3 is positioned on the wearer's ventral side when worn. As shown in Figure 3, the ventral portion 3 has a rectangular shape when unfolded and extended, and has a ventral waist end 101. The ventral waist end 101 constitutes the waist opening 1W.

[0036] [Composition of the absorbent body] The absorbent body 4 is fixed to the skin-facing side of the outer casing 5. The absorbent body 4 has at least an absorbent core 41, and may further have a surface sheet 2, a back sheet 7, a core wrap sheet 42 covering the absorbent core 41, etc. In diaper 1, as shown in Figure 9, the absorbent body 4 has a structure in which the back sheet 7, an absorbent body 40 consisting of an absorbent core 41 and a core wrap sheet 42 covering the absorbent core 41, and a surface sheet 2 are laminated in the thickness direction Z. The absorbent body 40 and the surface sheet 2 are bonded together with an adhesive (not shown). The absorbent body and the back sheet 7 are bonded together with an adhesive (not shown). The materials used in each component of the absorbent body 4 (back sheet 7, absorbent core 41, core wrap sheet 42, surface sheet 2, etc.) can be any material used in the relevant art without any particular limitations.

[0037] As shown in Figures 3 and 5, the absorbent body 4 has an absorbent body front end 4a, which is the end in the longitudinal direction X located on the ventral side 3, and an absorbent body rear end 4b, which is the end in the longitudinal direction X located on the dorsal side 6. The absorbent body front end 4a and the absorbent body rear end 4b are both parallel to the transverse direction Y.

[0038] As shown in Figure 5, the absorbent body 4 has an absorbent body anterior end region 431 located on the ventral side 3 and an absorbent body posterior end region 432 located on the dorsal side 6. The absorbent body front end region 431 is defined as the region of the absorbent body 4 extending 50 mm in the vertical direction X from the absorbent body front end 4a. The absorbent body rear end region 432 is defined as the region of the absorbent body 4 extending 50 mm in the vertical direction X from the absorbent body rear end 4b.

[0039] As shown in Figure 9, the absorbent core 41 has an absorbent core anterior end 41a, which is the end in the longitudinal direction X located on the ventral side 3, and an absorbent core posterior end 41b, which is the end in the longitudinal direction X located on the dorsal side 6. The absorbent core anterior end 41a and the absorbent core posterior end 41b are each parallel to the transverse direction Y.

[0040] As shown in Figures 3 and 9, in the diaper 1 of this embodiment, the length of the absorbent body 4 in the vertical direction X is the same as the length of the absorbent core 41 in the vertical direction X, the front end 4a of the absorbent body and the front end 41a of the absorbent core are at the same position in the vertical direction X, and the rear end 4b of the absorbent body and the rear end 41b of the absorbent core are at the same position in the vertical direction X. Furthermore, the length of the absorbent body 4 in the vertical direction X may be longer than the length of the absorbent core 41 in the vertical direction X, the front end 41a of the absorbent core may be located inward in the vertical direction X from the front end 4a of the absorbent body, and the rear end 41b of the absorbent core may be located inward in the vertical direction X from the rear end 4b of the absorbent body.

[0041] As shown in Figure 5, the absorbent core 41 has an absorbent core front end region 411 located in the absorbent body front end region 431, an absorbent core rear end region 412 located in the absorbent body rear end region 432, and an absorbent core excretion region 413 located in the crotch area 9.

[0042] The absorbent core 41 contains a water-absorbing polymer and fibrous pulp. Specifically, the absorbent core 41 is composed of, for example, an aggregate of hydrophilic fibers such as cellulose including pulp fibers, an aggregate of the hydrophilic fibers and the water-absorbing polymer, or a laminated structure in which the water-absorbing polymer is supported between two absorbent sheets.

[0043] The core wrap sheet 42 is a liquid-permeable sheet that covers at least the skin-facing surface of the absorbent core 41. From the viewpoint of maintaining the shape of the absorbent core 41, the core wrap sheet 42 is typically configured to cover the entire surface area of ​​the absorbent core, including both the skin-facing and non-skin-facing surfaces. As the core wrap sheet 42, for example, a thin paper made of hydrophilic fibers or a liquid-permeable nonwoven fabric can be used.

[0044] 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 22, 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.

[0045] [Configuration of side seal and side reinforcement] A pair of side seals 8, each extending in the vertical direction X, cause the ventral portion 3 and the dorsal main body portion 61 to form a tubular shape that conforms to the wearer's waist, creating the waist opening 1W and leg openings 1L of the diaper 1. As shown in Figure 11, the side seals 8 typically include multiple sealing portions S.

[0046] In the side seal 8, the sealing portion S is the portion where the thermoplastic sheets 50 of both the ventral portion 3 and 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 heat sealing or ultrasonic sealing. Multiple sealing portions S are arranged spaced apart in the longitudinal direction X and extend in the transverse direction Y. By arranging the 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.

[0047] A pair of side reinforcement sections 105 are provided on a pair of dorsal extension side edges 104 of the dorsal extension section 60, and are continuous with the side seal 8. The side reinforcement sections 105 are shaped like extensions of the side seal 8. As shown in Figure 11, the side reinforcement sections 105, like the side seal 8, include multiple sealing sections S. Multiple elastic bodies 70 are arranged on the dorsal extension section 60. The presence of a pair of side reinforcement sections 105 at both ends of the elastic body 70 in the lateral direction Y increases the rigidity of the pair of dorsal extension side edges 104, making it less likely for the dorsal extension section 60 to curl up when worn. Furthermore, since the pair of side reinforcement sections 105 are continuous with the side seal 8 and include multiple sealing sections S similar to those of the side seal 8, the diaper 1 can be easily manufactured without increasing the manufacturing process or materials. In Figure 3, the area of ​​the side seal 8 is represented by dots, and the area of ​​the side reinforcement sections 105 is represented by diagonal lines.

[0048] As shown in Figure 11, the width of the rectangular side seal 8, which extends in a band shape in the vertical direction X (corresponding to the width of the side edges 54 and 55), is defined as extending from the side edge on the inside of the seal area B in the horizontal direction Y to the side edge 540 of the ventral part 3 and the side edge 550 of the dorsal main body part 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 11, 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 range of each of the left and right side seals 8 is the area from the side edge (inner side seal side edge 8d) that extends in the vertical direction X and is located inside the lateral direction Y of the rectangular seal area B, to the side edges 540 and 550.

[0049] As shown in Figure 11, the width range of the rectangular side reinforcement portion 105, which extends in a band shape in the vertical direction, is defined as extending from the side edge on the inside of the seal region B in the lateral direction Y to the dorsal extension side edge 1040 of the dorsal extension portion 60. The side edge located on the inner side in the lateral direction Y of the side reinforcement portion 105 is referred to as the inner side reinforcement portion side edge 105d. This inner side reinforcement portion side edge 105d coincides with the side edge located on the inner side in the lateral direction Y of the seal region B. The side edge located on the lateral Y-outward side of the side reinforcement portion 105 is referred to as the outer side reinforcement portion side edge 105c. This outer side reinforcement portion side edge 105c coincides with the dorsal extension side edge 1040. As shown in Figure 11, each sealing portion S of the side reinforcement portion 105 does not reach the dorsal extending side edge 1040 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 dorsal extending side edge 1040. In other words, in the dorsal extension portion 60, the range of each of the left and right pair of side reinforcing portions 105 is the region from the inner side reinforcing portion side edge 105d, which is the side edge extending in the vertical direction X located inside the lateral direction Y of the rectangular seal region B, to the dorsal extension side edge 1040.

[0050] The side reinforcement portion 105 is a highly rigid area due to the presence of multiple sealing portions S. By providing the side reinforcement portion 105 on the dorsal extension side edge portion 104, the rigidity of the pair of dorsal extension side edge portions 104 is increased, making the dorsal extension portion 60 less likely to curl up. Furthermore, because an elastic body is placed on the dorsal extension portion 60, the contraction force of the elastic body gives the dorsal extension portion 60 thickness and robustness, making the dorsal extension portion 60 less likely to curl up. In addition, because the side seal 8 and the side reinforcement portion 105 are continuous, the occurrence of bending of the dorsal extension portion 60 starting from the boundary portion 103 is suppressed.

[0051] As shown in Figures 1(A) and (B) and Figure 3, a pair of side seals 8 each have an upper side seal end 8a and a lower side seal end 8b, which constitute both ends in the vertical direction X. In a continuous side seal 8 and side reinforcement portion 105, the upper side seal end 8a is located at the boundary portion 110 between the side seal 8 and the side reinforcement portion 105. The upper side seal end 8a is located on the boundary portion 103.

[0052] The side reinforcement portion 105 is not required. However, by providing the side reinforcement portion 105, in the diaper 1 in its discarded form, the area between the dorsal portion 6 and the ventral portion 3 of the waist opening end Wa can be more reliably covered by the dorsal extension portion 60 across the entire width Y in the lateral direction of the dorsal extension portion 60, thereby more reliably suppressing leakage of feces. Therefore, it is preferable to provide the side reinforcement portion 105.

[0053] [Composition of waste tape] As shown in Figure 2(B), the diaper 1 further includes a disposal tape 10 positioned on the back side 6 so as to overlap with the absorbent body 4 in a plan view. Furthermore, the configuration in which "the disposal tape 10 overlaps with the absorbent body 4 in a plan view" includes a configuration in which a portion of the disposal tape 10 overlaps with the absorbent body 4 in a plan view. The disposal tape 10 is fixed to the back side 6 of the outer surface 5a, which is the non-skin-facing surface of the outer casing 5. The disposal tape 10 is positioned on the vertical center line CL1 along the vertical direction X, which divides the diaper 1 into two equal parts in the horizontal direction Y.

[0054] As shown in Figure 4, the waste tape 10 has a fixing portion 11 and an extension portion 12. The fixing portion 11 extends in the vertical direction X and is fixed to the outer surface 5a, which is the non-skin-facing surface of the back side portion 6 of the outer casing 5. The extension portion 12 includes a first end (for example, an upper end portion 12a, described later) connected to the fixing portion 11, and is detachably arranged on the fixing portion 11. The extension portion 12 extends in the vertical direction X and is configured to be extendable as described later. The statement that each component of the disposal tape 10 "extends in the longitudinal direction X" means that the longitudinal direction X1 of each component of the disposal tape 10 is parallel to the longitudinal direction X or forms an angle of 20 degrees or less with it. From the viewpoint of facilitating unfolding and extension by the person disposing of the diaper 1, it is preferable that this longitudinal direction X1 is parallel to the longitudinal direction X, as shown in Figure 2(A).

[0055] Furthermore, in this embodiment, the waste tape 10 has a non-stretchable fastening portion 13 that is connected to the second end of the stretch portion 12 (for example, the lower end portion 12b described later) and is peelably arranged on the stretch portion 12. The waste tape 10 shown in Figure 3 has a fixing portion 11, an extendable portion 12, and a fastening portion 13 stacked in this order in the thickness direction Z. When unfolded, it becomes a long tape with the fixing portion 11, extendable portion 12, and fastening portion 13 arranged in this order. Note that "unfolding the waste tape 10" means peeling the extendable portion 12 from the fixing portion 11 and peeling the fastening portion 13 from the extendable portion 12.

[0056] The fixed portion 11 includes an upper end portion 11a located above in the vertical direction X, and a lower end portion 11b located below in the vertical direction X on the opposite side. The extension portion 12 includes an upper end portion 12a located above in the vertical direction X, and a lower end portion 12b located below in the vertical direction X on the opposite side. In this embodiment, the upper end portion 12a constitutes the first end portion of the extension portion 12, and the lower end portion 12b constitutes the second end portion of the extension portion 12. The fastening portion 13 includes an upper end portion 13a located above in the vertical direction X, and a lower end portion 13b located below in the vertical direction X on the opposite side. The upper ends 11a, 12a, and 13a are the parts located furthest upward in the vertical direction X at the fixing part 11, the extension part 12, and the fastening part 13, respectively, while the lower ends 11b, 12b, and 13b are the parts located furthest downward in the vertical direction X at the fixing part 11, the extension part 12, and the fastening part 13, respectively.

[0057] As shown in Figure 4, the portion of the fixing part 11 on the upper end 11a side is folded back, for example, on the extension part 12 side (non-skin side), forming a folded portion. The upper end 11a of the fixing part 11 is connected to the upper end 12a of the extension part 12 by this folded portion. The portion of the extension portion 12 on the lower end 12b side is folded back, for example, towards the fastening portion 13 side (non-skin side), forming a folded portion. The lower end 12b of the extension portion 12 is connected to the lower end 13b of the fastening portion 13 by this folded portion. As shown in Figure 3, the waste tape 10 has a structure in which the fixing portion 11, the extension portion 12, and the fastening portion 13 are folded in three in a Z shape.

[0058] The fixing portion 11 includes, for example, a fixing portion sheet piece 14 including a first surface 14a and a second surface 14b, and a fixing portion adhesive portion 15 arranged on the second surface 14b. The fixing sheet piece 14 is composed of a strip-shaped sheet piece extending in the vertical direction X. The fixing sheet piece 14 can be made of an elastic or non-elastic material, and conventionally used known materials such as resin sheets (plastic sheets, films, etc.), nonwoven fabrics, and woven fabrics can be used without particular limitation. Even if the fixing sheet piece 14 is elastic, its elasticity is not exhibited because it is fixed to the outer surface 5a. The adhesive portion 15 for fixing the fixing sheet piece 14 to the outer surface 5a. The disposal tape 10 is irremovably fixed to the outer surface 5a of the diaper 1 by the adhesive portion 15. The adhesive portion 15 for fixing is formed of a known adhesive, such as a hot melt adhesive.

[0059] The stretchable portion 12 includes a sheet piece 16 for the stretchable portion, which includes a first surface 16a and a second surface 16b, and an adhesive portion 17 for the stretchable portion, which is located on the second surface 16b. The sheet piece 16 for the extension portion is composed of a strip-shaped, stretchable sheet piece extending in the longitudinal direction X. The sheet piece 16 for the extension portion may have the same size as the sheet piece 14 for the fixing portion, or it may have a different size. The adhesive portion 17 for the stretchable portion is designed to allow the sheet piece 16 for the stretchable portion to be peelably bonded to the first surface 14a of the fixing portion 11 in the laminated state of the waste tape 10 described above. Therefore, it is preferable that the adhesive portion 17 for the stretchable portion be formed with a weakly adhesive adhesive.

[0060] The stretchable portion 12 is configured to stretch in the longitudinal direction X1 when a tensile force is applied to the waste tape 10. Specifically, the stress at the start of stretching of the stretchable portion 12 is preferably 5.0 N or less, more preferably 3.0 N or less. As such an elongated sheet piece 16, for example, an elongable film can be used. Examples of such films include single-layer films and multilayer films such as co-extruded films. Furthermore, as the material constituting the elongable film, a resin film formed by melt-extruding a polyolefin resin such as linear low-density polyethylene is preferred. Examples of the polyolefin resin include polypropylene homopolymer; polypropylene copolymers such as block copolymers, random copolymers, and random block copolymers of polypropylene and polyethylene, etc.; blends of the polypropylene homopolymer and the polypropylene copolymer; polyethylene such as high-density polyethylene, low-density polyethylene, and linear low-density polyethylene; and blends of the polyethylene and the polypropylene homopolymer and / or the polypropylene copolymer. In addition, various thermoplastic elastomers such as olefin-based, polyester-based, polyamide-based, and styrene-based resins may be blended with these. Furthermore, at least one material selected from the group consisting of polyvinyl chloride, ethylene-vinyl acetate copolymer, and polyvinyl alcohol is also preferred.

[0061] The fastening portion 13 is configured to be able to be fastened to the outer surface 5a of the diaper 1 when the diaper 1 is disposed of, with the disposal tape 10 extended. The fastening portion 13 includes a sheet piece 18 for the fastening portion, which includes a first surface 18a and a second surface 18b, and an adhesive portion 19 for the fastening portion, which is located on the second surface 18b. The fastening sheet piece 18 is composed of a strip-shaped, non-stretchable sheet piece extending in the longitudinal direction X. The fastening sheet piece 18 may have the same size as the fixing sheet piece 14 or the extension sheet piece 16, or it may have a different size. The adhesive portion 19 for fastening is formed by peelably bonding a sheet piece 18 for fastening to the first surface 16a of the stretched portion 12 in the laminated state of the waste tape 10 described above, and fastening the fastening portion 13 to any position on the outer surface 5a of the diaper 1. The degree of adhesiveness of the adhesive portion 19 for fastening is preferably determined from this viewpoint.

[0062] The fastening portion 13 is non-stretchable. "Non-stretchable" means that it does not exhibit elongation in the longitudinal direction X1, or that its elongation is very low compared to the elongation portion 12. Specifically, the stress at the start of plastic deformation of the fastening portion 13 is preferably 30 N or less, more preferably 25 N or less. As such a sheet piece 18 for the fastening portion, conventionally used known materials such as resin sheets (plastic sheets, films, etc.), nonwoven fabrics, and woven fabrics can be used without particular limitation. The method for measuring the stress at the start of plastic deformation of the fastening portion 13 will be described later.

[0063] Furthermore, the disposal tape 10 shown in Figure 4 has a gripping portion 20 joined to the upper end 13a of the fastening portion 13. The gripping portion 20 is a part for the person disposing of the diaper 1 to grasp when unfolding and extending the disposal tape 10. From the viewpoint of ease of gripping, the gripping portion 20 is typically not adhesive. The gripping portion 20 is formed of a sheet piece separate from the fastening portion sheet piece 18, for example, and connected to the second surface 18b of the fastening portion sheet piece 18.

[0064] As will be explained in more detail later, when disposing of diaper 1, the rolled-up diaper 1 is secured with disposal tape 10 to maintain its rolled-up shape. When disposing of the diaper, the gripping portion 20 of the disposal tape 10 is grasped by the fingers of the person disposing of it, and the disposal tape 10 is pulled in the longitudinal direction X1, causing the disposal tape 10 to unfold from a stacked state to a strip-like state. Further pulling of the gripping portion 20 in the longitudinal direction X1 causes the extension portion 12 to begin extending.

[0065] As shown in Figure 7(A), the unfolded and stretched waste tape 10 in the longitudinal direction X1 overlaps the dorsal extension 60. When the waste tape 10 is unfolded and stretched to its maximum length and aligned with the dorsal extension 60, the stretched portion 12 protrudes from the dorsal extension 60. When this stretched waste tape 10 is wrapped around the rolled-up diaper and secured to the outer surface 5a, as shown in Figure 7(B), the space between the dorsal portion 6 and the ventral portion 3 of the waist opening end Wa is covered and securely sealed by the dorsal extension 60.

[0066] Furthermore, as in the diaper 1 of this embodiment, the disposal tape 10 may be elastic. The elasticity of the disposal tape 10 allows for a sufficient length of tape to be wrapped around the rolled-up diaper 1, making the diaper 1 more compact. While elastic disposal tapes allow for more compact diaper storage, they present the challenge of pressure being applied to the diaper during wrapping, making it easier for stool to leak out. However, in diaper 1 of this embodiment, even with the use of elastic disposal tapes, the lid provided by the dorsal extension prevents stool from leaking out, allowing for hygienic and more compact disposal.

[0067] [Actions taken and methods of diaper disposal] A typical procedure for disposing of a diaper 1 using the disposal tape 10 configured as described above will be explained.

[0068] First, the ventral portion 3 and the dorsal main body portion 61 of the side seal 8 of the used diaper 1 are separated and folded in half. Specifically, the diaper 1 is placed so that the ventral portion 3 and the dorsal main body portion 61 are overlapped with their skin-facing surfaces facing inward. At this time, the crotch area 9 is folded in the middle of the vertical direction X, and the ventral waist end 101 and the boundary portion 103 between the dorsal extension portion 60 and the dorsal main body portion 61 are in the same position in the vertical direction X.

[0069] Next, as shown in Figure 7(A), roll up the diaper 1 from the crotch area 9 towards the waist opening 1W so that the abdominal area 3, which is the side without the disposal tape 10, is on the inside. Grasp the tab 20 of the disposal tape 10 with your fingers and pull the disposal tape 10 in the longitudinal direction X1 to unfold the disposal tape 10 from a stacked state to a strip-like state. By further pulling the tab 20 in the longitudinal direction X1, the stretchable portion 12 begins to stretch.

[0070] Next, the extended waste tape 10 is wrapped around the outer surface 5a of the rolled-up diaper 1. Then, the fastening portion 13 is attached to any position on the outer surface 5a of the diaper 1. This results in the disposal methods for diaper 1 shown in Figures 7(B) and 8.

[0071] As shown in Figures 7(A) and (B), when the diaper 1 is rolled up and secured with the disposal tape 10, the dorsal extension 60 is pulled by the stretched disposal tape 10, bends at the first bend 81, and collapses towards the ventral portion 3. As a result, the diaper 1 takes on a disposal form in which the dorsal extension 60 covers the ventral waist end 101, as shown in Figures 7(B) and 8. In the diaper 1 of this embodiment, the disposal tape 10 overlaps with the absorbent body 4 in a plan view. Therefore, when wrapping the disposal tape 10 around the outer surface 5a of the rolled-up diaper 1, the stretched disposal tape 10 overlaps with the first bent portion 81. This makes it easier for a fold to occur starting from the first bent portion 81, and allows the ventral waist end 101 to be more reliably covered by the dorsal extension portion 60.

[0072] The diaper 1 of this embodiment has a dorsal extension 60 and a first fold portion 81 on the dorsal side portion 6. As shown in Figure 6, the diaper 1, which has a swollen absorbent body 4, is folded in half, and when the dorsal side portion 6 is folded with the skin-facing surface facing inward, starting from the first fold portion 81, the dorsal extension 60 is configured such that the length in the vertical direction X is long enough to cover the ventral waist end portion 101. More specifically, the relationship between the length X in the vertical direction of the first region R1 and the sum of the thickness d1 of the front end region 431 of the absorbent body after swelling and the thickness d2 of the rear end region 432 of the absorbent body after swelling is defined as described below. Thus, in the diaper 1 of this embodiment, as shown in Figures 7(B) and 8, when disposed of, the dorsal extension 60 reliably covers the ventral waist end 101, and consequently, the dorsal extension 60 covers the area between the dorsal portion 6 and the ventral portion 3 near the waist opening, preventing the feces 80 in the dorsal portion 6 and ventral portion 3 from spilling out. As a result, when the used rolled-up diaper 1 is secured with the disposal tape 10, even if pressure is applied to the diaper 1, the dorsal extension 60, which functions as a lid, suppresses the feces from spilling out, making it less likely for the person disposing of the diaper to get their hands dirty, and allowing used diapers to be disposed of hygienically and compactly.

[0073] [First bend] In a diaper 1 that is folded in half, by creating a boundary where there is a difference in rigidity between the upper and lower parts, the area near the boundary can be designated as a first bent portion 81. In other words, by creating a difference in rigidity between the upper region above the boundary and the lower region below the boundary, the diaper becomes more prone to bending near the boundary, and the area near the boundary can be designated as a first bent portion 81.

[0074] The difference in rigidity between the upper and lower regions can be created by methods such as the following: varying the number of sheets stacked in the thickness direction between the upper and lower regions, varying the basis weight of the constituent materials, varying the shrinkage stress in the lateral direction Y, varying the thickness, varying the density of heat-sealing points between multiple sheets stacked in the thickness direction, and varying the coating area of ​​the hot-melt adhesive provided between multiple sheets stacked in the thickness direction.

[0075] Refer to Figures 3 and 5. In the diaper 1 of this embodiment, in a folded state, the vicinity of the boundary between the region where the absorbent core 41 is present and the region where it is not present in the longitudinal direction X of the back portion 6 functions as the first bend portion 81. The first bend portion 81 extends in the transverse direction Y. In the back portion 6, the region where the absorbent core 41 is present is thinner than the region where the absorbent core 41 is not present, and is a region with a lower basis weight of the constituent material of the absorbent core 41, and therefore has lower rigidity. In a plan view, the rear end portion 41b of the absorbent core 41 is a boundary where a difference in rigidity occurs above and below it, and the vicinity of the rear end portion 41b of the absorbent core functions as the first bend portion 81.

[0076] The first bent portion 81 is said to be located near the rear end portion 41b of the absorbent core when viewed in plan, with the rear end portion 41b of the absorbent core as the reference point, the first bent portion 81 is located in a region 5 mm above the rear end portion 41b of the absorbent core, and a region 5 mm below the rear end portion 41b of the absorbent core, totaling a region of 10 mm in the vertical direction X. The first bent portion 81 is more likely to form in the region with lower rigidity (in this case, the region where the absorbent core 41 does not exist).

[0077] When defining the length of the first region R1 in the vertical direction X, the position of the first bend 81 is defined as being 1 mm upward along the vertical direction X from the boundary between regions where a difference in stiffness occurs in a plan view (in this case, the rear end portion 41b of the absorbent core), with respect to the boundary.

[0078] Because the absorbent core 41 has a water-absorbing polymer, it absorbs urine and other fluids and swells, easily increasing in thickness. Therefore, in a used diaper 1, a difference in rigidity can easily be formed between the upper and lower parts of the rear end 41b of the absorbent core.

[0079] From the viewpoint of ensuring a sufficient urine absorption area while further suppressing the leakage of feces during disposal, the distance in the vertical direction X between the rear end portion 41b of the absorbent core and the boundary portion 103 is preferably 25 mm or more and 75 mm or less, and more preferably 30 mm or more and 70 mm or less.

[0080] Furthermore, the vicinity of the boundary portion 103 (the boundary between the back extension portion 60 and the back main body portion 61) parallel to the lateral direction Y passing through the upper end portion 8a of the side seal may be configured to function as the first bent portion 81. In the folded diaper 1, the boundary portion 103 is the boundary between the region where the ventral portion 3 exists and the region where it does not. The boundary portion 103 extends in the lateral direction Y. In the folded diaper 1, the region consisting only of the dorsal extension portion 60, where the ventral portion 3 does not exist, is thinner and has a lower basis weight of the constituent material than the region where the dorsal main body portion 61, where the ventral portion 3 exists, and the ventral portion 3 overlap, and therefore has lower rigidity. The boundary portion 103 is a boundary where a difference in rigidity occurs above and below it, making it easily bendable and capable of functioning as a first bend portion 81.

[0081] Furthermore, in the diaper 1 of this embodiment, the distance in the vertical direction X between the rear end portion 41b of the absorbent core, which functions as the first fold portion 81, and the boundary portion 103 is relatively short (for example, the distance in the vertical direction X is 10 mm or less), so the dorsal portion 6 is more easily folded near the rear end portion 41b of the absorbent core.

[0082] The first bent portion 81 is said to be located near the boundary portion 103 when viewed from above, with respect to the boundary portion 103, the first bent portion 81 is located in a region 5 mm above the boundary portion 103 and a region 5 mm below the boundary portion 103, totaling a region of 10 mm in the vertical direction X. The first bent portion 81 is more likely to form in the region with lower rigidity (in this case, the region of the dorsal extension portion 60).

[0083] When the vicinity of the boundary 103 functions as the first bend 81, the position of the first bend 81 when defining the length of the first region R1 in the vertical direction X is defined as being 1 mm upward along the vertical direction X from the boundary (in other words, towards the region with lower rigidity) relative to the boundary (in this case, the boundary 103) between regions where a difference in rigidity occurs in a plan view. Furthermore, if there are multiple first bends 81, the first bend 81 located further away from the back waist end 102 is defined as the first bend when defining the first region R1.

[0084] [Relationship between the longitudinal length of the first region and the thickness of the absorbent body after swelling] As shown in Figures 6, 7(A), and 7(B), in a used diaper 1, the absorbent core 41 swells by absorbing the wearer's urine, etc. Therefore, the thickness of the absorbent core 41, and consequently the thickness of the absorbent body 4, changes to be thicker than before use (before absorbing urine, etc.).

[0085] As shown in Figures 6, 7(A), and (B), in diaper 1, the length in the vertical direction X of the first region R1 is greater than or equal to the sum of the thickness d1 of the front end region 431 of the absorbent body after swelling and the thickness d2 of the rear end region 432 of the absorbent body after swelling. In the diaper 1 of this embodiment, as shown in Figure 6, the first region R1 is folded with the skin-facing surface facing inward, starting from the first fold portion 81, and the dorsal waist end portion 102, which is the tip of the first region R1, is located at approximately the same position in the thickness direction Z as the outer surface 5a of the ventral portion 3. The method for measuring the thickness d1 of the front end region 431 of the absorbent body after swelling and the thickness d2 of the rear end region 432 of the absorbent body after swelling will be described later.

[0086] With this configuration, in the diaper 1 as shown in Figure 7(B) in the disposal form, the dorsal extension 60, which is folded with the skin-facing surface inward starting from the first fold portion 81, covers the ventral waist end 101, and the space between the dorsal portion 6 and the ventral portion 3 near the waist opening is covered by the dorsal extension 60, effectively suppressing the leakage of feces 80. As a result, when rolling up the used diaper 1, even if pressure is applied to the diaper 1, the leakage of feces is suppressed by the dorsal extension 60, making it less likely for the person disposing of the diaper to get their hands dirty, and enabling the diaper to be disposed of hygienically and compactly after defecation.

[0087] In this embodiment of diaper 1, as shown in Figures 2 and 3, the back waist end 102 is a straight line parallel to the horizontal direction Y, and the length of the first region R1 in the vertical direction X (the length from the back waist end 102 to the first bend 81 in the vertical direction X) is equal across the entire width in the horizontal direction Y. However, the embodiment is not limited to this form, and for example, the back waist end 102 may be a curved shape that is convex upwards in the vertical direction X. In this case, the length of the first region R1 in the vertical direction X is not equal across the entire width in the horizontal direction Y, so the length of the vertical direction X at the part of the first region R1 where the length of the vertical direction X is smallest (minimum length) is defined as "the length of the vertical direction X of the first region R1".

[0088] Furthermore, from the viewpoint of more securely sealing the space between the dorsal portion 6 and the ventral portion 3 near the waist opening with the dorsal extension portion 60 and further suppressing the leakage of feces, it is more preferable that the length X in the vertical direction of the first region R1 is longer than the sum of the thickness d1 of the front end region 431 of the absorbent body after swelling and the thickness d2 of the rear end region 432 of the absorbent body after swelling, as will be explained in the second embodiment described later.

[0089] (Method for measuring the thickness of the absorbent body after swelling) The method for measuring the thickness of the front end region 431 and the rear end region 432 of the absorbent body after swelling is described below.

[0090] The side seal of the diaper was peeled off to separate the ventral part of the side seal from the dorsal main body part. As shown in Figure 3, it was stretched and unfolded to spread it flat, and saline solution was injected from the surface sheet side to simulate a swollen state. In this specification, all states of "swelling," including "swelling" of the "swollen absorbent body," "swelling" of the "thickness of the front end region of the absorbent body after swelling," and "thickness of the rear end region of the absorbent body after swelling," refer to this simulated swollen state. The injection point for the physiological saline solution was set 40 mm ventrally from the midpoint of the fold in the horizontal direction Y (center of the product, at the very bottom of the crotch). More specifically, the "midpoint of the fold in the horizontal direction Y" corresponds to the midpoint of the horizontal direction Y of a hypothetical line parallel to the horizontal direction Y that bisects the region between the boundary (boundary between the dorsal main body and the dorsal extension) and the ventral waist end in the vertical direction X. The injection point for the physiological saline solution is 40 mm ventrally along the vertical direction X from the midpoint of the horizontal direction Y on this hypothetical line. For diapers intended for infants, the amount of saline solution injected was set at 90-160g. Specifically, the amount of saline solution injected varied depending on the size of the diaper. The injection amount was 90g for S size and below, 120g for M size, and 160g for L size and above. If the diaper in question is for adults, the amount of saline solution to inject is determined based on the information regarding the number of absorptions indicated on the packaging in which the diaper was contained. Specifically, the injection amount is the product of the number of uses indicated on the package and the volume of urine per urination. If the number of uses is indicated as a range, for example, 4 to 5 times, the injection amount is calculated using the highest number within that range. After injection, diaper 1 was folded in half, and the thickness of the diaper in the area where the absorbent front end region 431 and the absorbent rear end region 432 overlapped was defined as the sum of the thickness d1 of the absorbent front end region after swelling and the thickness d2 of the absorbent rear end region 432 after swelling. To measure the thickness of the area where the absorbent front end region 431 and the absorbent rear end region 432 overlap (corresponding to the sum of thickness d1 and thickness d2), a Keyence CCD laser displacement meter (LK-2100) was used to measure at five arbitrary locations in the area where the absorbent front end region 431 and the absorbent rear end region 432 overlapped, and the average of these measurements was taken as the thickness (mm) of the sample.

[0091] [Basis weight of superabsorbent polymer] It is preferable that the sum of the basis weight of the superabsorbent polymer in the front end region 411 of the absorbent core and the basis weight of the superabsorbent polymer in the rear end region 412 of the absorbent core is smaller than the basis weight of the superabsorbent polymer in the excretion region 413 of the absorbent core. The method for measuring the basis weight of the superabsorbent polymer will be described later.

[0092] This configuration suppresses the increase in the thickness of the absorbent core due to the absorption of urine, etc., in the front end region 411 and the rear end region 412 of the absorbent core. As a result, the increase in thickness due to urine absorption near the waist opening of the folded diaper 1 is suppressed, and the dorsal extension 60 can more reliably seal the space between the dorsal portion 6 and the ventral portion 3 near the waist opening, thereby more effectively suppressing leakage of feces.

[0093] [Pulp basis weight] It is preferable that the sum of the pulp basis weight of the front end region 411 of the absorbent core and the pulp basis weight of the rear end region 412 of the absorbent core is smaller than the pulp basis weight of the excretion region 413 of the absorbent core. The method for measuring pulp basis weight will be described later.

[0094] This configuration suppresses the increase in the thickness of the absorbent core due to the absorption of urine, etc., in the front end region 411 and the rear end region 412 of the absorbent core. As a result, the increase in thickness due to urine absorption near the waist opening of the folded diaper 1 is suppressed, and the dorsal extension 60 can more reliably seal the space between the dorsal portion 6 and the ventral portion 3 near the waist opening, thereby more effectively suppressing leakage of feces.

[0095] [Method for measuring the basis weight of superabsorbent polymers and pulp] The methods for measuring the basis weight of the superabsorbent polymer and pulp in the absorbent core front region 411, the absorbent core rear region 412, and the absorbent core excretion region 413 will be described below.

[0096] Peel off the side seal of the diaper, stretch and unfold it as shown in Figure 3 to spread it flat, remove the absorbent core 41, and cut the absorbent core 41 to separate the absorbent core front region 411, the absorbent core rear region 412, and the absorbent core excretion region 413. Calculate the area of ​​each of the absorbent core front region 411, the absorbent core rear region 412, and the absorbent core excretion region 413. Then, place each of the absorbent core front region 411, the absorbent core rear region 412, and the absorbent core excretion region 413 into a sufficiently large transparent resealable plastic bag and shake it up and down for about 10 minutes until no more absorbent polymer falls off the pulp. Cut off the bottom of the transparent resealable plastic bag, remove the accumulated absorbent polymer, and weigh it. Calculate the pulp mass from the calculated absorbent polymer mass. In the absorbent core front region 411, the absorbent core rear region 412, and the absorbent core excretion region 413, the basis weight of the pulp can be calculated from the area of ​​the absorbent core and the pulp mass, and the basis weight of the water-absorbing polymer can be calculated from the area of ​​the absorbent core and the water-absorbing polymer mass.

[0097] [Further composition of the absorbent body] In diaper 1, the liquid-permeable surface sheet 2 located closest to the skin may have irregularities or openings. The uneven surface of the surface sheet 2 makes it easier for stool to remain in the recesses. As a result, stool is less likely to spill out in the longitudinal direction X outward from the rear end 4b of the absorbent body, and even if it does spill out, the amount is easily reduced, making it easier for the dorsal extension 60 to suppress stool spillage. The surface sheet 2 has openings, which makes it easier for stool to enter the absorbent body 4 through the openings. As a result, stool is less likely to spill out in the longitudinal direction X outward from the rear end 4b of the absorbent body, and even if it does spill out, the amount is easily reduced, making it easier for the dorsal extension 60 to suppress stool spillage.

[0098] The absorbent core 41 may have recesses. The absorbent core 41 has a recess, which makes it easier for stool to remain in the recess. As a result, stool is less likely to spill out in the longitudinal direction X outward from the rear end 4b of the absorbent body, and even if it does spill out, the amount is easily reduced, making it easier for the dorsal extension 60 to suppress stool spillage.

[0099] A nonwoven fabric may be placed between the absorbent core 41 and the surface sheet 2, which is a liquid-permeable sheet located closest to the skin. The core wrap sheet 42 covering the absorbent core 41 may be made of a nonwoven fabric, or a nonwoven fabric may be placed between the absorbent body 40 and the surface sheet 2. Alternatively, the surface sheet may be configured as a two-layer structure with a lower layer and an upper layer laminated together, with the upper layer located closest to the skin being made of a liquid-permeable sheet, and the lower layer located further away from the skin being made of a nonwoven fabric, so that a nonwoven fabric is placed between the absorbent core 41 and the liquid-permeable sheet (upper layer of the surface sheet) located closest to the skin.

[0100] In this way, by providing a nonwoven fabric between the absorbent core 41 and the liquid-permeable sheet located closest to the skin, a space for stool to enter in the thickness direction can be formed by the nonwoven fabric. As a result, stool is less likely to spill out in the longitudinal direction X outward from the rear end 4b of the absorbent body, and even if it does spill out, the amount is easily reduced, making it easier for the dorsal extension 60 to suppress stool spillage.

[0101] [Further structure of the dorsal extension] At least one of the multiple sheets constituting the dorsal extension 60 may be a spunbond-meltblown-spunbond nonwoven fabric (SMS nonwoven fabric). SMS nonwoven fabric is a relatively tightly woven nonwoven fabric. In this way, by using a tightly woven SMS nonwoven fabric for the dorsal extension 60, which functions as a lid when the diaper is disposed of, it becomes less likely for feces to leak out even when pressure is applied to the rolled-up diaper 1, thus suppressing leakage of feces.

[0102] As shown in Figure 9, in the diaper 1 of this embodiment, the outer casing 5 is folded back towards the skin-facing side at the ventral waist end 101 and the dorsal waist end 102. This folded portion of the outer casing 5 is called the "folded portion." The folded portion is positioned to cover the front end 4a and rear end 4b of the absorbent body.

[0103] In the dorsal extension portion 60 of the diaper 1, at least one of the outer layer sheet 51 and the inner layer sheet 52 that constitute the outer casing 5 may be folded back. In the diaper 1 of this embodiment, as shown in Figure 9, in the dorsal extension portion 60, one end of the outer layer sheet 51 in the vertical direction X is folded back toward the skin-facing side, while the inner layer sheet 52 is not folded back. This configuration makes the dorsal extension 60 more rigid compared to the case where neither the outer sheet 51 nor the inner sheet 52 is folded over. As a result, in the diaper 1 in its discarded form, the dorsal extension 60 can more reliably cover the area between the dorsal portion 6 and the ventral portion 3 near the waist opening, across the entire width of the dorsal extension 60 in the lateral direction Y, thereby further suppressing leakage of feces.

[0104] <Second Embodiment> As shown in Figures 12 to 15, the diaper 1 of the second embodiment may have a second bend 82 in addition to the first bend 81, which is closer to the back waist end 102 than the first bend 81, thereby further suppressing leakage of stool.

[0105] In the diaper 1A of this embodiment, as shown in Figure 13, the diaper 1A having a swollen absorbent body 4 is folded in half, and when it is folded with the skin-facing side inward starting from the first fold portion 81, and then folded again with the skin-facing side inward starting from the second fold portion 82, the dorsal extension portion 60 is configured such that the length in the vertical direction X is long enough to cover the ventral waist end 101 and the outer surface 5a of the ventral portion 3 near the ventral waist end 101. More specifically, in diaper 1A, the length X in the vertical direction of the first region R1 is greater than the sum of the thickness d1 of the front end region 431 of the absorbent body after swelling and the thickness d2 of the rear end region 432 of the absorbent body after swelling. The only difference between diaper 1 and diaper 1A is the length of the dorsal extension portion 60. The following description will focus on the differences in configuration from diaper 1 of the first embodiment.

[0106] As shown in Figures 12 to 15, the back portion 6 of diaper 1A has a first fold portion 81 and a second fold portion 82. The first fold portion 81 and the second fold portion 82 are parts of the back portion 6 that are easily folded when diaper 1A is disposed of in the form shown in Figure 17, and they extend in the lateral direction Y when unfolded and extended. The second fold portion 82 is located closer to the back waist end 102 than the first fold portion 81. The first fold portion 81 and the second fold portion 82 are the starting points for folding with the skin-facing surface of the back portion 6 facing inward, and both extend in the lateral direction Y.

[0107] As shown in Figure 12, the region of the back portion 6 from the first bend portion 81 to the back waist end portion 102 is referred to as the first region R1. The region of the back portion 6 from the second bend portion 82 to the back waist end portion 102 is referred to as the second region R2. The region of the back portion 6 from the first bend portion 81 to the second bend portion 82 is referred to as the third region R3. The first region R1 includes the second region R2 and the third region R3. The second bend portion 82 is located within the first region R1. In the disposable diaper 1A, as shown in Figures 13 and 15, the third region R3 covers the ventral waist end 101, and the second region R2 is positioned to cover the outer surface 5a of the outer body 5, which is the non-skin-facing surface of the ventral portion 3 near the ventral waist end 101 of the ventral portion 3. The first bend portion 81 becomes the starting point for a bend toward the ventral portion 3 with the skin-facing surface of the dorsal portion 6 facing inward. As the dorsal portion 6 bends starting from the first bend portion 81, the first region R1, including the dorsal extension portion 60, bends toward the ventral waist end 101 of the ventral portion 3. Furthermore, the second bend portion 82 located in the first region R1 becomes the starting point for a bend with the skin-facing surface facing inward, causing the first region R1 to bend toward the outer surface 5a of the ventral portion 3, and the second region R2 covers the outer surface 5a near the ventral waist end 101.

[0108] In this way, the dorsal portion 6 is provided with two bent portions (a first bent portion 81 and a second bent portion 82), so that the dorsal extension 60 can cover the overlapping portion of the dorsal portion 6 and the ventral portion 3 near the waist opening, including the outer surface 5a near the ventral waist end 101, thereby further suppressing the leakage of feces.

[0109] From the viewpoint of more reliably suppressing the leakage of feces during disposal and suppressing the curling of the dorsal extension portion 60 when wearing the diaper, the length of the third region R3 in the vertical direction X is preferably greater than or equal to the sum of the thickness d1 of the front end region 431 of the absorbent body after swelling and the thickness d2 of the rear end region 432 of the absorbent body after swelling, and the length of the second region R2 in the vertical direction X is preferably 2 mm or more and 10 mm or less, and more preferably 4 mm or more and 8 mm or less.

[0110] In the folded diaper 1A, the dorsal extension 60 is composed of only one layer of outer casing 5 and has lower rigidity than the area where the dorsal main body 61 and the ventral part 3 overlap. Therefore, when the disposal tape 10 is wrapped around and secured to the diaper 1, as shown in Figures 13 and 15, the dorsal extension 60 is pulled by the movement of the disposal tape 10 and easily bends along the shape of the rolled-up diaper 1A, making it easy for a second bend 82 to form in the dorsal extension 60.

[0111] In this embodiment, the dorsal extension 60 is made less rigid than the region where the dorsal main body 61 and the ventral portion 3 overlap, and the force applied from the waste tape 10 to the dorsal extension 60 when the waste tape 10 is wrapped around it is used to form the second bend portion 82 in the first region R1. However, the second bend portion 82 may also be formed by providing regions with different rigidity levels vertically along the longitudinal direction X, as in the first bend portion 81. With this configuration, a second bendable portion 82, which is a more easily bent portion, can be provided at any position on the dorsal extension portion 60 included in the first region R1, and the dorsal extension portion 60 can more reliably cover the area.

[0112] Diaper 1B, as shown in Figure 16, is a modified example. In the dorsal extension 60 included in the first region R1, a second bent portion 82 is formed by varying the number of sheet layers at the top and bottom. In the diaper 1B shown in Figure 16, in the dorsal extension 60, only the outer layer sheet 51 is folded back, and the inner layer sheet 52 does not reach the dorsal waist end 102. Therefore, the dorsal extension 60 has two regions of thermoplastic sheets constituting the outer casing 5: a region of two sheets (a region where two outer layer sheets overlap, roughly corresponding to the second region R2) and a region of three sheets (a region where two outer layer sheets and one inner layer sheet overlap, roughly corresponding to the third region R3). The upper region of two thermoplastic sheets has fewer sheet layers, is thinner, and has lower rigidity than the lower region of three thermoplastic sheets. The first boundary, which is the boundary between the region with two thermoplastic sheets and the region with three thermoplastic sheets, in other words, the boundary where the number of layered sheets changes, is a boundary where a difference in rigidity occurs above and below it, and the vicinity of the first boundary functions as the second bent portion 82.

[0113] The second bend 82 is said to be located near the first boundary if, with respect to the first boundary, the second bend 82 is located in a region 5 mm above the first boundary and a region 5 mm below the first boundary, totaling a region of 10 mm in the vertical direction X. The second bend 82 is more likely to form in the region with lower rigidity (in this case, the region with two thermoplastic sheets).

[0114] When defining the length of the vertical X of the second region R2 and the third region R3, the position of the second bend 82 is defined as being 1 mm upward along the vertical X from the boundary (in other words, towards the region with lower rigidity) of the boundary (here, the first boundary) where the difference in rigidity occurs in a plan view.

[0115] (Specific examples of the vertical lengths of the first to third regions) A specific example of the length of the first region in diaper 1A is given. Note that the length of the first region may be changed as appropriate depending on the person wearing diaper 1 (infant or adult). In the diaper 1 for infants, from the viewpoint of suppressing leakage of stool when discarding the diaper and suppressing the curling of the dorsal extension portion 60 when wearing the diaper, the length of the vertical X of the first region R1 is preferably 12 mm or more and 80 mm or less, and more preferably 15 mm or more and 60 mm or less. As described above, the length of the vertical X of the second region R2 is preferably 2 mm or more and 10 mm or less, and more preferably 4 mm or more and 8 mm or less. The length of the vertical X of the third region R3 is preferably 10 mm or more and 78 mm or less, and more preferably 12 mm or more and 58 mm or less.

[0116] 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.

[0117] For example, the pant-type absorbent article according to the present invention does not have to be a disposable diaper for infants, but may be a disposable diaper for adults or children, for example. Furthermore, 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.

[0118] Furthermore, for example, the waste tape 10 may not have a fastening portion 13, but may be configured to be fastened to the outer surface 5a by the adhesive portion 17 for the extension portion of the extension portion 12. In this case, a tab may be attached to the second end of the extension portion 12 (the end not connected to the fixing portion 11). Furthermore, the disposal tape 10 does not necessarily have to have a gripping portion 20. In this case, for example, by providing a non-adhesive portion on one end of the fastening portion 13, the person disposing of the tape can grasp that portion. Alternatively, the lower end 12b of the extension portion 12 may be connected to the fixing portion 11, the upper end 12a may constitute the second end of the extension portion 12, and the lower end 12b may constitute the first end of the extension portion 12. In this case, the upper end 12a may be connected to the fastening portion 13, and the pinch portion 20 may be positioned on the crotch area 9 side. Furthermore, the fixing portion 11 may not have an adhesive portion 15 for fixing, and the fixing portion sheet piece 14 may be fixed to the outer surface 5a by a known joining method other than adhesive (for example, fusion bonding).

[0119] Furthermore, although the embodiments described above have used a diaper 1 having an outer covering 5 extending across the ventral portion 3, the crotch area 9, and the dorsal portion 6, the invention is not limited to this. For example, the absorbent pant-type article of the present invention may also be an absorbent pant-type article with a divided outer covering. In such an absorbent pant-type article, the outer covering is divided into a dorsal sheet member positioned on the back of the wearer and a ventral sheet member positioned on the ventral side, with the dorsal sheet member and the ventral sheet member joined at their side edges. The absorbent body is also stretched and fixed between the dorsal sheet member and the ventral sheet member. [Explanation of symbols]

[0120] 1, 1A, 1B...Panty-type absorbent items (disposable diapers, diapers) 1W…Waist opening 1L... Leg opening 3...ventral part 4… Absorbent body 5…Exterior 6…Dorsal part 8... Side seal 10…Disposal tape 54...Lateral margin of the ventral part 55...Lateral edge of the dorsal portion 60...Dorsal extension part 61...Dorsal body part 81...First bend 101...Ventral waist end 102...Rear waist end 431... Absorbent main body front end region 432... Absorbent body rear end region

Claims

1. A pant-type absorbent article comprising an absorbent body and an outer body positioned on the non-skin-facing side of the absorbent body, having a waist opening and a pair of leg openings, 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, The exterior body is, A ventral portion positioned on the wearer's abdominal side and having an ventral waist end that constitutes the waist opening, A back portion positioned on the back of the wearer, having a back waist end that constitutes the waist opening, It has, The dorsal waist end is located further from the pair of leg openings in the longitudinal direction than the ventral waist end, The rear side portion of the exterior body is A dorsal extension extending from the ventral waist end to the dorsal waist end in the longitudinal direction, The dorsal main body portion obtained by removing the dorsal extension portion from the dorsal portion, It has, The outer casing has a pair of side seals, each joined to the lateral edge of the ventral portion and the lateral edge of the dorsal main body portion. The aforementioned back portion is equipped with a disposal tape for securing the wearer during disposal, which is fixed to the non-skin-facing surface of the back portion. The absorbent body has an absorbent body front end region located on the ventral side and an absorbent body rear end region located on the dorsal side. The dorsal portion has a first fold portion extending laterally, which serves as the starting point for a fold with the skin-facing surface facing inward. The longitudinal length of the first region, which is the area from the first bent portion of the dorsal side to the dorsal waist end, is greater than or equal to the sum of the thickness of the front end region of the absorbent body after swelling and the thickness of the rear end region of the absorbent body after swelling. Absorbent pants.

2. A pant-type absorbent article comprising an absorbent body and an outer body positioned on the non-skin-facing side of the absorbent body, having a waist opening and a pair of leg openings, 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, The exterior body is, A ventral portion positioned on the wearer's abdominal side and having an ventral waist end that constitutes the waist opening, A back portion positioned on the back of the wearer, having a back waist end that constitutes the waist opening, It has, The dorsal waist end is located further from the pair of leg openings in the longitudinal direction than the ventral waist end, The rear side portion of the exterior body is A dorsal extension extending from the ventral waist end to the dorsal waist end in the longitudinal direction, The dorsal main body portion obtained by removing the dorsal extension portion from the dorsal portion, It has, The outer casing has a pair of side seals, each joined to the lateral edge of the ventral portion and the lateral edge of the dorsal main body portion. The aforementioned back portion is equipped with a disposal tape for securing the wearer during disposal, which is fixed to the non-skin-facing surface of the back portion. The absorbent body has an absorbent body front end region located on the ventral side and an absorbent body rear end region located on the dorsal side. The dorsal portion has a first fold portion extending laterally, which serves as the starting point for a fold with the skin-facing surface facing inward. The first region, which is the area from the first bent portion of the dorsal side to the dorsal waist end, includes the dorsal extension, The absorbent pant-type article, which has a swollen absorbent body and separates the ventral portion of the side seal from the dorsal portion of the main body, is folded in half, and when the dorsal portion is folded with the skin-facing surface facing inward, starting from the first fold, the dorsal extension covers the ventral waist end. Absorbent pants.

3. The dorsal portion has a first bent portion and a second bent portion that extends laterally and is located closer to the waist end of the dorsal portion than the first bent portion, and serves as the starting point of the bend with the skin-facing surface facing inward. The pant-type absorbent article according to claim 1 or 2.

4. The first bent portion is located near the boundary portion which is the boundary between the dorsal extension portion and the dorsal main body portion. The pant-type absorbent article according to claim 1 or 2.

5. The absorbent body includes an absorbent core. The absorbent core has an absorbent core rear end which is the longitudinal end located on the back side, The first bent portion is located near the rear end of the absorbent core. The pant-type absorbent article according to claim 1 or 2.

6. The exterior body is constructed by laminating multiple sheets, The second bent portion is located near the boundary where the number of layers of the sheet changes. The pant-type absorbent article according to claim 3.

7. The outer body has the ventral portion, the dorsal portion, and the crotch portion located between the ventral portion and the dorsal portion. The absorbent body includes an absorbent core having a water-absorbent polymer. The absorbent core has an absorbent core front end region located in the front end region of the absorbent body, an absorbent core rear end region located in the rear end region of the absorbent body, and an absorbent core excretion region located in the crotch area. The sum of the basis weight of the water-absorbing polymer in the front end region of the absorbent core and the basis weight of the water-absorbing polymer in the rear end region of the absorbent core is smaller than the basis weight of the water-absorbing polymer in the excretion region of the absorbent core. The pant-type absorbent article according to claim 1 or 2.

8. The outer body has the ventral portion, the dorsal portion, and the crotch portion located between the ventral portion and the dorsal portion. The absorbent body includes an absorbent core having pulp, The absorbent core has an absorbent core front end region located in the front end region of the absorbent body, an absorbent core rear end region located in the rear end region of the absorbent body, and an absorbent core excretion region located in the crotch area. The sum of the pulp basis weight of the front end region of the absorbent core and the pulp basis weight of the rear end region of the absorbent core is smaller than the pulp basis weight of the excretion region of the absorbent core. The pant-type absorbent article according to claim 1 or 2.

9. The aforementioned waste tape has a fixing portion fixed to the non-skin-facing surface of the back side, and an extendable portion connected to the fixing portion. When the aforementioned waste tape is unfolded and extended to its maximum length and aligned with the dorsal extension, the extension protrudes from the dorsal extension. The pant-type absorbent article according to claim 1 or 2.

10. The aforementioned waste tape is elastic. The pant-type absorbent article according to claim 1 or 2.

11. The aforementioned dorsal extension is constructed by laminating multiple sheets. At least one of the multiple sheets constituting the dorsal extension is a spunbond-meltblown-spunbond nonwoven fabric. The pant-type absorbent article according to claim 1 or 2.

12. The dorsal extension is, A pair of dorsal extension side edges, each facing each other in the lateral direction and extending in the longitudinal direction, A pair of side reinforcing portions provided on each of the pair of dorsal extension side edges and has The pant-type absorbent article according to claim 1 or 2.

13. The exterior body is constructed by laminating multiple sheets, The dorsal extension is such that at least one of the multiple sheets constituting the outer casing has one end in the vertical direction folded back toward the skin-facing side. The pant-type absorbent article according to claim 1 or 2.

Images