Absorbent panty-type items

Abstract

Regarding absorbent pant-type items that are resistant to bending. [Solution] The pant-type absorbent article comprises an outer casing having a ventral portion and a dorsal portion. The dorsal portion has a dorsal extension portion extending from the ventral waist end and a dorsal main body portion. The ventral portion has a ventral fold portion, and the dorsal portion has a dorsal fold portion. The outer casing comprises an outer layer sheet and an inner layer sheet, and an elastic body disposed between these sheets. The dorsal waist region of the dorsal portion includes the dorsal extension portion. The dorsal waist region has a dorsal first region and a dorsal second region located in order from top to bottom in the longitudinal direction. The dorsal second region has a dorsal secondA region located in the dorsal extension portion and a dorsal secondB region located in the dorsal main body portion. In the dorsal waist region, the elastic body is not disposed in the dorsal first region but in the dorsal secondA region and the dorsal secondB region. The elastic body is not disposed in the dorsal fold portion but in the ventral fold portion. In its natural state, the dorsal first region is longer in the thickness direction than the dorsal second region.

Description

Technical Field

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

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 side end portions. The ventral exterior body and the dorsal exterior body are joined by the side seals, thereby forming the waist portion of the pants-type absorbent article. Patent Document 1 discloses a pants-type absorbent article having a dorsal extension portion on the dorsal waist side of the exterior body. Such a configuration prevents excrement from leaking from the dorsal side.

[0003] In general, a plurality of absorbent articles folded in two are housed in a packaging bag formed of a resin film or the like to form an absorbent article package.

Prior Art Documents

Patent Documents

[0004]

Patent Document 1

Summary of the Invention

Problems to be Solved by the Invention

[0005] In an absorbent article package, when an absorbent article provided with the dorsal extension portion described in Patent Document 1 is housed in a two-folded state, the two-folded absorbent article is configured with a two-layer exterior body in which the dorsal exterior body and the ventral exterior body overlap, except for the dorsal extension portion configured with a single-layer exterior body. For this reason, in the absorbent article located near the side surface of the absorbent article package, the relatively thin dorsal extension portion is easily bent, and the absorbent article is already bent when taken out from the absorbent article package, which poses the problem of being difficult to put on.

[0006] The present invention has been made in view of the above problems, and relates to a pant-type absorbent article that is resistant to bending. [Means for solving the problem]

[0007] A pant-type absorbent article according to one embodiment of the present invention has a waist opening and a pair of leg openings. The above-mentioned pant-type absorbent article comprises an absorbent body and an outer casing. The above-mentioned outer casing is positioned on the non-skin-facing side of the absorbent main body. The above-mentioned pant-type absorbent article has a longitudinal direction extending from the wearer's abdominal side through the crotch area to the back, a transverse direction perpendicular to the longitudinal direction, and a thickness direction perpendicular to the longitudinal and transverse directions. The above-described 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 described above 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. The ventral portion has a ventral folded portion formed by folding the outer body back toward the skin-facing surface along the lateral direction of the ventral waist end, and a ventral opposing portion that faces the ventral folded portion in the thickness direction. The back portion has a back folded portion formed by folding the outer body back along the lateral direction of the back waist end toward the skin-facing surface, and a back facing portion that faces the back folded portion in the thickness direction. In the dorsal extension described above, the dorsal folded portion and the dorsal opposing portion overlap in the thickness direction. The exterior body comprises a laminated outer layer sheet and an inner layer sheet, and a plurality of elastic bodies that are expandable and contractible in the lateral direction and are positioned between the outer layer sheet and the inner layer sheet. The absorbent body described above has a front end and a rear end that are opposite each other in the longitudinal direction. The anterior end is located on the ventral side, and the posterior end is located on the dorsal side. The ventral portion has a ventral waist region, which is the area from the ventral waist end to the anterior end in the longitudinal direction. The dorsal portion has a dorsal waist region, which is the area from the dorsal waist end to the rear end in the longitudinal direction. The dorsal waist region mentioned above includes the dorsal extension. The dorsal waist region described above has two regions divided in the longitudinal direction: a dorsal first region and a dorsal second region. The dorsal first region described above is a region with a predetermined longitudinal length from the dorsal waist end, including the dorsal waist end, towards the leg opening. The dorsal second region described above is adjacent to the dorsal first region described above and is located closer to the leg opening than the dorsal first region described above. The dorsal second region described above includes a dorsal second A region located in the dorsal extension and a dorsal second B region located in the dorsal main body. The dorsal extension includes the dorsal first region and the dorsal second A region. The elastic body is positioned in the dorsal waist region and the ventral waist region, respectively. In the dorsal waist region described above, the elastic body is not located in the dorsal first region, but is located in the dorsal second A region and the dorsal second B region. The elastic body is not placed in the dorsal folded portion, but is placed in the ventral folded portion. In its natural state, the dorsal first region is longer in the thickness direction than the dorsal second region.

[0008] An absorbent article packaging according to one embodiment of the present invention comprises a packaging bag and a plurality of absorbent articles contained in the packaging bag. The absorbent article package described above has a height direction, a width direction, and a depth direction that are mutually orthogonal to each other. The packaging bag described above has a front surface portion and a rear surface portion extending in the height direction and the width direction respectively, an upper surface portion and a lower surface portion extending in the width direction and the depth direction respectively, and a first side surface portion and a second side surface portion extending in the depth direction and the height direction respectively. The absorbent article described above is housed in the packaging bag in a state of being folded in two, with the abdominal side portion and the back side main body portion overlapped in the thickness direction. The absorbent article in the state of being folded in two has a waist side end portion arranged at the wearer's waist and a crotch side end portion arranged at the wearer's crotch. In the absorbent article package described above, among the plurality of absorbent articles, a plurality of absorbent articles arranged at least along the width direction are defined as one stage of absorbent article group, and one or a plurality of stages of absorbent article groups are housed in the height direction. The plurality of absorbent articles belonging to the absorbent article group are arranged along the width direction from the first side surface portion to the second side surface portion in a posture where the abdominal side portion and the back side main body portion face the first side surface portion and the second side surface portion respectively, the crotch side end portion is positioned above in the height direction, and the waist side end portion is positioned below in the height direction. Effects of the Invention

[0009] According to the pants-type absorbent article of the present invention, it is less likely to bend. Brief Description of the Drawings

[0010] [Figure 1] It is a schematic perspective view showing the pants-type absorbent article according to one embodiment of the present invention. [Figure 2] It is a schematic plan view showing the skin-facing surface of the pants-type absorbent article described above, and is a view showing a mode in which the pants-type absorbent article is unfolded, and the elastic bodies of each part are stretched to spread it out into a planar shape. [Figure 3]This is a schematic cross-sectional view near the design waist opening of the above-mentioned pants-type absorbent article. [Figure 4] (A) is a perspective view of an absorbent article package containing a plurality of the above-mentioned pants-type absorbent articles, and (B) is a schematic cross-sectional view of the absorbent article package taken along line IVB-IVB in Fig. 4(A). [Figure 5] This is a schematic side view of the pants-type absorbent article in a naturally folded two-fold state, taken out from the above-mentioned absorbent article package. [Figure 6] This is an enlarged view of the region enclosed by the dashed-line rectangle VI in Fig. 5, and is a schematic cross-sectional view near the waist opening of the pants-type absorbent article in the above-mentioned two-folded state. [Figure 7] This is for explaining the positional relationship of the joint portions provided on the outer package, where (A) is a plan view of the ventral side portion of the above-mentioned pants-type absorbent article, and (B) is a plan view of the dorsal side portion of the above-mentioned pants-type absorbent article. [Figure 8] This is a diagram for explaining the method of measuring the thickness of the outer package (laminate) of the above-mentioned pants-type absorbent article. [Figure 9] This is a diagram for explaining the method of confirming the skin-side bulge of the first dorsal region of the above-mentioned pants-type absorbent article, and is a top view of the pants-type absorbent article as viewed from the waist end side. [Modes for Carrying Out the Invention]

[0011] Hereinafter, embodiments of the present invention will be described with reference to the drawings. Note that the same reference numerals are assigned to the configurations that have already appeared, and descriptions thereof may be omitted.

[0012] <Overall Configuration of Pants-type Absorbent Article> In Fig. 1 to Fig. 4, a pants-type disposable diaper 1 is shown as the pants-type absorbent article according to the embodiment of the present invention. The pants-type disposable diaper 1 is hereinafter referred to as the diaper 1. As shown in Figure 1, 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 longitudinal direction X and a transverse direction Y. The longitudinal direction X corresponds to the direction extending from the wearer's ventral side through the crotch to the dorsal side. The transverse direction Y is perpendicular to the longitudinal direction X. Furthermore, as shown in Figures 2 and 3, the direction perpendicular to the longitudinal direction X and the transverse direction Y of the diaper 1 is defined as the thickness direction Z. In this specification, the "length of the thickness direction Z" may simply be referred to as "thickness".

[0013] In this specification, "waist side" and "upper side" mean the side in the vertical direction X (up and down direction) that is closer to the waist opening end Wa of the waist opening 1W and the side that is further away from the leg opening 1L. "Leg side" and "lower side" mean the side in the vertical direction X (up and down direction) that is further away from the waist opening end Wa and the side that is closer to the leg opening 1L. In this specification, 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.

[0014] As shown in Figures 1 to 4, 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 comprises first to fourth elastic bodies 71 to 74, a leg elastic body 11, and an elastic body 45 for forming a leak-proof cuff. Figure 2 shows the diaper 1 unfolded, with the elastic bodies in each part extended, and spread out flat to achieve the design dimensions, completely eliminating the influence of the elastic bodies. This form is also referred to as the "unfolded and extended state" of the diaper 1. Unfolding the diaper 1 means separating the ventral part 3 and the dorsal part 6 of the side seal 8, which will be described later.

[0015] As shown in Figures 1 to 3, the absorbent body 4 has a posterior end 106 located on the dorsal side 6, which is the end in the longitudinal direction X, and an anterior end 107 located on the ventral side 3, which is the end in the longitudinal direction X. The anterior end 107 and the posterior end 106 face each other in the longitudinal direction X.

[0016] As shown in Figure 2, the outer garment 5 has 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 at the wearer's crotch. 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 (see Figure 1) that follows the wearer's leg opening. The dorsal portion 6 has a dorsal extension portion 60 and a dorsal main body portion 61. The dorsal extension portion 60 is the portion of the dorsal portion 6 that protrudes upward in the longitudinal direction X compared to the abdominal portion 3. The outer edge of the exterior body 5 is preferably constructed to be symmetrical (left-right symmetrical) with respect to the vertical center line CL.

[0017] Furthermore, as shown in Figures 1 and 2, 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 by overlapping them in the thickness direction Z. The left side seal 8 has a configuration in which the left lateral edge 54 of the ventral portion 3 and the left lateral edge 55 of the dorsal portion 6 are joined together by overlapping them in the thickness direction Z. Typically, the side seals 8 include multiple seal portions formed by fusing and joining the thermoplastic sheets 50 of both the ventral portion 3 and the dorsal main body portion 61 by heat sealing, ultrasonic sealing, or the like.

[0018] Furthermore, the back extension portion 60 of the back portion 6 of the outer casing 5 has a pair of back extension side edges 104 facing each other in the lateral direction Y, and a pair of side reinforcing portions 105 provided on each of the pair of back extension side edges 104. The side reinforcing portions 105 are continuous with the side seal 8 and extend in a direction that includes a component in the vertical direction X. The side reinforcing portions 105, like the side seal 8, include a plurality of sealing portions. In Figure 2, the area of ​​the side seal 8 is represented by dots, and the area of ​​the side reinforcement portion 105 is represented by diagonal lines.

[0019] The outer casing 5 includes a plurality of thermoplastic sheets 50. The outer casing 5 is configured, for example, as a laminate of a plurality of thermoplastic sheets 50. 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.

[0020] The outer casing 5 includes, as shown in Figure 3, an outer layer sheet 51 and an inner layer sheet 52, as a plurality of thermoplastic sheets 50. 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. First to fourth elastic bodies 71 to 74 are positioned between the inner layer sheet 52 and the outer layer sheet 51.

[0021] <Composition of the absorbent body> As shown in Figure 3, the absorbent body 4 comprises a liquid-permeable surface sheet 2 that forms the skin side, a liquid-impermeable (including water-repellent) back sheet 7 that forms the non-skin side, and a liquid-retaining absorbent 40 positioned between the surface sheet 2 and the back sheet 7. For example, the absorbent body 4 has a configuration in which the back sheet 7, the absorbent 40, and the surface sheet 2 are laminated in the thickness direction Z. The absorbent 40 and the surface sheet 2 are bonded together with an adhesive (not shown). The absorbent 40 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 material 40, front sheet 2, etc.) can be any material used in the relevant art without any particular limitations.

[0022] As shown in Figure 2, each side of the absorbent body 4 along the longitudinal direction X is provided with a leak-proof cuff 44 having an elastic body 45 for forming a leak-proof cuff that is stretched in the longitudinal direction X. The leak-proof cuff 44 is made of a material that is impermeable to liquid or water-repellent and breathable. The elastic body 45 for forming the leak-proof cuff is provided near the free end 44a of the leak-proof cuff 44 and forms a three-dimensional gather.

[0023] The absorbent body 40 of the absorbent main body 4 has a liquid-retaining absorbent core (not shown) and a core wrap sheet (not shown) that covers the absorbent core.

[0024] A core wrap sheet is a liquid-permeable sheet that covers at least the skin-facing side of an absorbent core. Typically, the core wrap sheet is configured to cover the entire surface of the absorbent core, including both the skin-facing and non-skin-facing sides. Examples of core wrap sheets include tissue paper made of hydrophilic fibers and liquid-permeable nonwoven fabrics.

[0025] The absorbent core contains a superabsorbent polymer and pulp fibers. Specifically, the absorbent core is composed of, for example, an aggregate of hydrophilic fibers such as cellulose including pulp fibers, an aggregate of the hydrophilic fibers and a superabsorbent polymer, or a laminated structure in which a superabsorbent polymer is supported between two absorbent sheets.

[0026] In the diaper 1 of this embodiment, as shown in Figure 3, the rear end 106 and the front end 107 of the absorbent body 4 are at the same position in the vertical direction X. This configuration allows the absorbent body 4 on the ventral side to extend to the vicinity of the ventral waist end 101, increasing the rigidity of the ventral portion 3 and making it less likely for the outer casing 5 to roll up near the ventral waist end 101. This prevents leakage due to rolling up and suppresses discomfort caused by rolling up.

[0027] <Exterior structure> As shown in Figures 1 and 2, the outer garment 5 has a ventral portion 3, a crotch portion 9, and a dorsal portion 6. The dorsal portion 6 has a dorsal extension portion 60 and a dorsal main body portion 61. The ventral portion 3 of the outer garment 5 has a ventral waist end portion 101 that constitutes the waist opening end Wa of the waist opening 1W. The dorsal portion 6 of the outer garment 5 has a dorsal waist end portion 102 that constitutes the waist opening end Wa of the waist opening 1W. The dorsal waist end portion 102 is located further from the pair of leg openings 1L in the longitudinal direction X than the ventral waist end portion 101. The dorsal waist end portion 102 is the end portion (dorsal extension end portion) of the dorsal extension portion 60 in the longitudinal direction X. In the illustrated example, the dorsal waist end portion 102 is a straight line extending in the transverse direction Y, but is not limited to this, and may be a curved shape (round shape) that gently bulges upward in the longitudinal direction X, for example.

[0028] Multiple elastic bodies (first to fourth elastic bodies 71 to 74) are arranged in the ventral portion 3 and the dorsal portion 6. More specifically, the outer casing 5 constituting the ventral portion 3 and the outer casing 5 constituting the dorsal portion 6 are constructed as laminates in which multiple elastic bodies are arranged between an outer layer sheet 51 and an inner layer sheet 52.

[0029] In diaper 1, the dorsal main body portion 61 is joined to the ventral portion 3 by a side seal 8 to form a tubular waist portion. On the other hand, the dorsal extension portion 60 is not ring-shaped because there is no ventral portion at the same position in the longitudinal direction X, and is provided with a pair of dorsal extension side edges 104 that serve as free ends on both sides in the transverse direction Y.

[0030] As shown in Figures 2 and 3, the diaper 1 has a folded structure in which at least a portion of the outer body 5 is folded back from the waist opening end Wa towards the skin-facing side. More specifically, as shown in Figure 3, in the ventral portion 3 of the diaper 1, the outer covering 5, which consists of laminated outer sheet 51 and inner sheet 52, is folded back along the lateral direction Y of the ventral waist end 101 towards the skin-facing surface 3a of the ventral portion 3. In the ventral portion 3, this folded portion is referred to as the ventral folded portion 85, and the outer covering portion that faces the ventral folded portion 85 in the thickness direction Z is referred to as the ventral opposing portion 86. The ventral folded portion 85 and the ventral opposing portion 86 are bonded together by ventral adhesive 19a. In the back portion 6 of diaper 1, the outer casing 5, consisting of laminated outer sheet 51 and inner sheet 52, is folded back along the lateral direction Y of the back waist end 102 towards the skin-facing surface 6a of the back portion 6. In the back portion 6, this folded portion is referred to as the back folded portion 80, and the portion opposite the back folded portion 80 in the thickness direction Z is referred to as the back opposing portion 81. The back folded portion 80 and the back opposing portion 81 are bonded together by back adhesive 19b.

[0031] As shown in Figure 3, the ventral folded portion 85 is positioned to cover the front end portion 107 of the absorbent body 4, and the end portion 851 of the ventral folded portion 85 overlaps with the absorbent material 40 which constitutes part of the absorbent body 4. In the ventral folded portion 85, the length of the inner layer sheet 52 is shorter in the vertical direction X than that of the outer layer sheet 51. As shown in Figure 3, the back folded portion 80 is positioned to cover the rear end portion 106 of the absorbent body 4, and the end portion 801 of the back folded portion 80 overlaps with the absorbent material 40 which constitutes part of the absorbent body 4. In the back folded portion 80, the length of the inner layer sheet 52 in the vertical direction X is shorter than that of the outer layer sheet 51. In the diaper 1 of this embodiment, as shown in Figure 2, the outer casing 5 is formed as a single laminate by connecting the ventral portion 3, the crotch portion 9, and the dorsal portion 6, and the ends 851 and 801 are the one end and the other end of the outer casing 5 in the longitudinal direction X, respectively.

[0032] As shown in Figure 3, in diaper 1, a second elastic body 72 is provided in the ventral folded portion 85, while no elastic body is provided in the dorsal folded portion 80.

[0033] [Composition of the dorsal side] As shown in Figures 1 and 2, the dorsal portion 6 of the outer casing 5 has a dorsal extension 60 and a dorsal main body portion 61. The dorsal extension 60 extends in the vertical direction X (up and down direction) from the ventral waist end 101 to the dorsal waist end 102. In the diaper 1, the dorsal extension 60 is the portion that protrudes upward from the ventral waist end 101. The dorsal main body portion 61 is the portion of the dorsal portion 6 excluding the dorsal extension 60. In other words, the dorsal main body portion 61 is the portion that is in the same position as the ventral portion 3 in the vertical direction X, while the dorsal extension 60 is the portion that does not face the ventral portion 3 and protrudes upward in the vertical direction X. As shown in Figures 1 and 2, the boundary between the dorsal extension 60 and the dorsal main body portion 61 (shown by a hypothetical dashed line) is denoted by reference numeral 103.

[0034] The length of the dorsal extension portion 60 in the vertical direction X (i.e., the length from the boundary portion 103 to the dorsal waist end portion 102) is preferably, for example, 10 mm to 40 mm, from the viewpoint of good pulling-up operation of the diaper 1, effective suppression of the dorsal extension portion 60 rolling up, and effective suppression of leakage of excrement from the dorsal side. The length of the dorsal extension portion 60 in the vertical direction X refers to the minimum length. As shown in Figures 1 and 2, when the dorsal waist end portion 102 is a straight line parallel to the transverse direction Y, the length of the dorsal extension portion 60 in the vertical direction X (the length from the dorsal waist end portion 102 to the boundary portion 103 in the vertical direction X) is equal across the entire width in the transverse direction Y. However, if, for example, the dorsal waist end portion 102 is a curved shape that is convex upward in the vertical direction X, the length of the dorsal extension portion 60 in the vertical direction X is not equal across the entire width in the transverse direction Y. In this configuration, the length of the portion of the dorsal extension 60 where the length in the longitudinal direction X is minimized (minimum length) is defined as "the length of the dorsal extension 60 in the longitudinal direction X". The longer the dorsal extension 60, the better it can prevent loose stools and other excrement from leaking out. However, if it is too long, it becomes difficult to pull up the diaper 1, and the dorsal extension 60 is more likely to curl up. Therefore, it is preferable that the length of the dorsal extension 60 be 40 mm or less. On the other hand, if the dorsal extension 60 is too short, it is easy for the dorsal extension 60 to be folded inward by hand when pulling up the diaper 1, making it difficult to pull up. Therefore, it is preferable that the length of the dorsal extension 60 be 10 mm or more. For example, in the diaper 1 of this embodiment, the length of the dorsal extension 60 in the vertical direction X is 15 mm.

[0035] As shown in Figure 3, the dorsal portion 6 includes a dorsal waist region 30. The dorsal waist region 30 is the region of the dorsal portion 6 from the dorsal waist end 102 to the rear end 106 in the longitudinal direction X. The dorsal waist region 30 includes the dorsal extension portion 60. The dorsal waist region 30 has a dorsal first region 31 and a dorsal second region 32, which are regions divided in the longitudinal direction X. The dorsal first region 31 and the dorsal second region 32 are adjacent, and the dorsal first region 31 is located above the dorsal second region 32. The dorsal second region 32 extends through the boundary portion 103 and spans both the dorsal extension portion 60 and the dorsal main body portion 61. The dorsal second region 32 has a dorsal second A region 32A located in the dorsal extension portion 60 and a dorsal second B region 32B located in the dorsal main body portion 61. The dorsal extension 60 includes a dorsal first region 31 and a dorsal second A region 32A. The dorsal waist region 30, including the dorsal extension portion 60, is a region in which two layers of exterior body 5 exist, with the exterior body 5 constituting the dorsal folded portion 80 and the exterior body 5 constituting the dorsal opposing portion 81 overlapping in the thickness direction Z.

[0036] As shown in Figure 3, an elastic body is provided in the dorsal waist region 30. In detail, in the dorsal waist region 30, the elastic body is not placed in the dorsal first region 31, but is placed in the dorsal second A region 32A and the dorsal second B region 32B. Furthermore, the elastic body is not placed in the dorsal folded portion 80.

[0037] Here, the dorsal first region 31, located on the upper side within the dorsal extension 60, does not contain an elastic body, making it less susceptible to the contraction force of the elastic body and easier to deform. As a result, the dorsal first region 31 can be easily deformed to be thicker than the dorsal second region 32, and as will be described in detail later, bending of the dorsal extension 60 starting from the boundary 103 can be effectively suppressed.

[0038] Furthermore, "the dorsal first region 31 is thicker than the dorsal second region 32 (its length in the thickness direction is longer)" means that the thickness of the dorsal first region 31 is greater than the thickness of both the dorsal second A region 32A and the dorsal second B region 32B. In other words, if the thicknesses of the dorsal second A region 32A and the dorsal second B region 32B are different, the thickest point within the dorsal second region 32 is used as the measurement target and compared with the thickness of the thickest point in the dorsal first region 31.

[0039] The dorsal first region 31 described above, in the design diaper 1 shown in Figure 3, includes the dorsal waist end 102 and is a region with a predetermined length X in the vertical direction from the dorsal waist end 102 to the leg opening 1L side (crotch side). Hereinafter, "determined length X in the vertical direction" may be referred to as "determined length".

[0040] The "design diaper" mentioned above corresponds to the state in which the dorsal extension 60 of a "natural state diaper (details will be described later)," as shown in Figure 6, in which the thickness d1 of the dorsal first region 31 is thicker than the thickness d2 of the dorsal second region 32, is stretched in the longitudinal direction X using a tensile testing machine (SHIMADU's "Autograph AG-X") until the tensile load reaches 19N. In stretching the dorsal extension 60 using a tensile testing machine, the dorsal waist end 102 and the boundary 103, which are opposite each other along the longitudinal direction X near the center of the dorsal extension 60 in the lateral direction Y, are clamped with the chucks of the tensile testing machine, and the distance between the chucks is widened at a speed of 300 mm / min, stretching the dorsal extension 60 until the tensile load reaches 19N. As a result of this stretching, as shown in Figure 3, the thickness d1 of the dorsal first region 31 and the thickness d2 of the dorsal second region 32 become approximately equal.

[0041] In the natural state of the diaper 1, from the viewpoint of making it easy to deform the dorsal first region 31 to be thicker than the thickness of the dorsal second region 32, and preventing it from becoming excessively thick, the "predetermined length" that defines the length of the dorsal first region 31 in the vertical direction X is preferably 5 mm or more and 10 mm or less, and more preferably 5 mm or more and 8 mm or less, assuming that the dorsal extension portion 60 has a dorsal second A region 32A in which an elastic body is arranged. Furthermore, the assumption that the dorsal extension portion 60 has a dorsal second A region 32A where an elastic body is arranged is intended to effectively suppress bending of the dorsal extension portion 60 starting from the boundary portion 103. Details will be described later.

[0042] As an example, in the diaper 1 of this embodiment, the length of the dorsal extension portion 60 in the vertical direction X is 15 mm, while the length of the dorsal first region 31 (a predetermined length) is 5 mm.

[0043] [Structure of the ventral region] As shown in Figure 3, the ventral portion 3 includes the ventral waist region 90. The ventral waist region 90 is the region of the ventral portion 3 from the ventral waist end 101 to the anterior end 107 in the longitudinal direction X. The ventral waist region 90, in the diaper design shown in Figure 3, has a ventral first region 91 and a ventral second region 92, which are regions divided in the longitudinal direction X. The ventral first region 91 and the ventral second region 92 are adjacent. The ventral first region 91 is located superior to the ventral second region 92. The ventral second region 92 is located closer to the leg opening 1L than the ventral first region 91. The ventral first region 91, in the design diaper 1 shown in Figure 3, includes the ventral waist end 101 and is a region of a predetermined length X in the longitudinal direction from the ventral waist end 101 to the leg opening 1L side (crotch side). The "predetermined length" that defines the length of the longitudinal X of the ventral first region 91 is the same as the "predetermined length" that defines the length of the longitudinal X of the dorsal first region 31.

[0044] As shown in Figure 3, etc., in diaper 1, an elastic material is provided in the area including the ventral waist end 101, which corresponds to the ventral first region 91, and its vicinity (ventral waist end region). In contrast, no elastic material is provided in the area including the dorsal waist end 102, which corresponds to the dorsal first region 31, and its vicinity (dorsal waist end region).

[0045] As shown in Figure 3, the ventral waist region 90 is a region in which two layers of outer covering 5 exist, where the outer covering 5 constituting the ventral folded portion 85 and the outer covering 5 constituting the ventral opposing portion 86 overlap in the thickness direction Z.

[0046] [About diapers in their natural state] From a hygienic standpoint, diaper 1 is typically distributed as a diaper package 100, an absorbent article package, contained within a packaging bag 20, as shown in Figures 4(A) and (B). Details of the diaper package will be described later.

[0047] As shown in Figure 5, the diaper 1 contained in the packaging bag 20 is folded in half at the crotch area 9, and has a form in which the outer casing 5 located on the ventral side and the outer casing 5 located on the dorsal side are superimposed in the thickness direction Z. More specifically, as shown in Figure 5, the ventral part 3 and the dorsal main body part 61 are superimposed in the thickness direction Z, and furthermore, the ventral crotch area 93 located on the ventral side of the fold of the crotch area 9 and the dorsal crotch area 96 located on the dorsal side are superimposed in the thickness direction Z. In this specification, a diaper having such a form and in a state in which no external force is applied to the elastic body of the diaper and the diaper is not stretched is referred to as a "natural state diaper". A "natural state diaper" is a diaper immediately after being removed from the diaper packaging body 100, and has not been subjected to any operations such as widening the waist opening. As shown in Figure 5, the natural state diaper 1 includes a waist end 17 and a crotch end 18. The crotch end portion 18 is formed by the fold in the crotch area 9.

[0048] As shown in Figures 5 and 6, in the natural state of the diaper 1, the region below the dorsal first region 31 is called the overlapping region C. The overlapping region C mainly includes the region in the diaper 1 where the outer covering 5 on the dorsal side and the outer covering 5 on the ventral side overlap in the thickness direction Z. On the other hand, the dorsal first region 31 is a region composed only of the outer covering 5 on the dorsal side, and is a region where there is no outer covering 5 overlapping in the thickness direction Z on the ventral side. The overlapping region C includes the region in the dorsal part 6 below the dorsal first region 31 and the ventral part 3 that overlap in the thickness direction Z, and the region where the dorsal crotch area 96 and the ventral crotch area 93 overlap in the thickness direction Z.

[0049] As shown in Figures 5 and 6, in diaper 1, the overlapping region C includes the waist overlapping region C1. The waist overlapping region C1 is the region in diaper 1 where the ventral waist region 90 and the dorsal outer covering 5, which is opposite the ventral waist region 90 in the thickness direction Z, overlap in the thickness direction Z. The outer covering 5 on the dorsal side of the waist overlapping region C1 is included in the dorsal second region 32. In diaper 1, the waist overlapping region C1 and the region below the waist overlapping region C1 are both regions where the outer casing 5 on the dorsal side and the outer casing 5 on the ventral side overlap in the thickness direction Z, and are regions that are thicker than the dorsal extension portion 60 in the design of diaper 1.

[0050] [Elastic body] In the diaper 1 of this embodiment, as shown in Figures 2, 3, and 6, a plurality of first elastic bodies 71, second elastic body 72, third elastic body 73, and fourth elastic body 74 extending in the lateral direction Y are arranged on the ventral side 3 and dorsal side 6 of the outer casing 5. The fineness of each of the first to fourth elastic bodies 71 to 74 is different, and in Figure 2, elastic bodies with different finenesses are shown with different line types. In Figures 3 and 6, elastic bodies with different finenesses are shown by different types of diagonal lines filling the inside of the circles that show the cross-section of the elastic bodies.

[0051] In Figure 2, the first elastic body 71 is shown by a dashed line, the second elastic body 72 by a long dashed line, the third elastic body 73 by a short dashed line, and the fourth elastic body 74 by a single dashed line. In Figures 3 and 6, the first elastic body 71 is shown by a dense diagonal line rising to the right, the second elastic body 72 by a dense diagonal line falling to the right, the third elastic body 73 by a sparse diagonal line rising to the right, and the fourth elastic body 74 by a sparse diagonal line falling to the right.

[0052] As shown in Figures 3 and 6, the multiple first to fourth elastic bodies 71 to 74 are arranged between the multiple thermoplastic sheets 50 of the outer casing 5, more specifically between the outer layer sheet 51 and the inner layer sheet 52. Each of the first to fourth elastic bodies 71 to 74 extends in the lateral direction Y across the entire width of the lateral direction Y and is arranged to be expandable and contractible in the lateral direction Y between a pair of side reinforcing portions 105 or a pair of side seals 8. These first to fourth elastic members 71 to 74 provide elasticity to the waist of the diaper 1, making it easier to put on and maintaining a good fit when worn. Furthermore, "the first to fourth elastic bodies 71 to 74 extend in the lateral direction Y" means that in the unfolded and extended state, the first to fourth elastic bodies 71 to 74 extend in the lateral direction Y. However, the above expression is not limited to the first to fourth elastic bodies 71 to 74 being parallel to the lateral direction Y in the unfolded and extended state, but also includes the state in which the whole extends in the lateral direction Y. In this embodiment, an example is given in which all of the elastic bodies 71 to 74 are parallel to the lateral direction Y.

[0053] The ends of the first to fourth elastic bodies 71 to 74, which are arranged in the ventral portion 3 and the dorsal main body portion 61 respectively, are preferably located in or near the side seal 8, from the viewpoint of ensuring the elasticity of the entire waist circumference of the diaper. Specifically, it is preferable that the distance of the ends from the side seal 8 in the lateral direction Y is 10 mm or less, and it is more preferable that the distance is 0 mm and the ends are located within the side seal 8.

[0054] The elastic body located on the dorsal side 6 will now be described. Furthermore, in the dorsal portion 6, if an elastic body exists at the boundary between adjacent regions (for example, the dorsal first region 31 and the dorsal second region 32), the elastic body at that boundary shall be positioned in the upper portion (the waist portion). The same applies to the ventral portion 3. As shown in Figures 3 and 6, in diaper 1, no elastic material is provided in the back folded portion 80. All elastic material provided in the back portion 6 is provided in the back opposing portion 81 and the portion of the outer body 5 that extends from the back opposing portion 81 toward the leg opening 1L.

[0055] The dorsal extension 60 includes a dorsal first region 31 and a dorsal second A region 32A. No elastic body is provided in the dorsal first region 31. Two first elastic bodies 71 are provided in the dorsal second A region 32A. All of these elastic bodies are provided in the dorsal opposing portion 81 and not in the dorsal folded portion 80. From the viewpoint of ensuring the stretchability of the dorsal extension 60 over almost the entire width in the lateral direction Y, it is preferable that both ends of the first elastic bodies 71 provided in the dorsal extension 60 in the longitudinal direction are located in or near the side reinforcement portion 105. Specifically, it is preferable that the distance of the end from the side reinforcement portion 105 in the lateral direction Y is 10 mm or less, and it is more preferable that the distance is 0 mm and the end is located within the side reinforcement portion 105.

[0056] In the back main body portion 61, two first elastic bodies 71 and one second elastic body 72 are arranged in the back second B region 32B, and in the region below the back second B region 32B, two second elastic bodies 72, four third elastic bodies 73, and four fourth elastic bodies 74 are arranged in order from the back waist end 102 side toward the leg opening 1L side. All of these elastic bodies are arranged in the back opposing portion 81 and the portion of the outer body 5 that extends downward (towards the leg opening 1L side) connected to the back opposing portion 81, but are not arranged in the back folded portion 80.

[0057] The elastic body located in the ventral portion 3 will now be described. As shown in Figures 3 and 6, in the diaper 1, the ventral portion 3 includes a ventral waist region 90, and the ventral waist region 90 includes a ventral first region 91 and a ventral second region 92. In the ventral first region 91, one second elastic body 72 is positioned in the ventral folded portion 85, and another second elastic body 72 is positioned in the ventral opposing portion 86. In the ventral second region 92, two second elastic bodies 72 are arranged in the ventral opposing portion 86. In the region of the ventral portion 3 below the ventral waist region 90, no elastic body is provided in the ventral folded portion 85. Instead, one second elastic body 72, four third elastic bodies 73, and four fourth elastic bodies 74 are provided in order from the ventral waist end 101 side toward the leg opening 1L side in the ventral opposing portion 86 and the outer body 5 that extends from the ventral opposing portion 86 toward the leg opening 1L side.

[0058] Thus, in diaper 1, elastic materials are provided in both the ventral first region 91 of the ventral waist region 90 and the ventral opposing portion 86, whereas in the dorsal first region 31 of the dorsal waist region 30, elastic materials are not provided in either the dorsal fold portion 80 or the dorsal opposing portion 81.

[0059] The elongation rate of each elastic element represents the ratio of the length of the elastic element in the unfolded and stretched state of the absorbent panty to the length of the elastic element in its natural length when removed from the absorbent panty. A lower elongation rate tends to result in a smaller elastic force when each elastic element is stretched. The elongation rate of the elastic body can be adjusted during manufacturing by adjusting the degree of elongation of each elastic body placed in the outer casing 5. During manufacturing, for example, the elastic body is stretched to a predetermined length, adhesive is applied to the elastic body, and the elastic body is fixed to the thermoplastic sheet 50 of the outer casing 5.

[0060] Furthermore, as shown in Figures 1 and 2, the outer casing 5 may include, in addition to the first to fourth elastic bodies 71 to 74, a leg elastic body 11 and a leak-proof cuff forming elastic body 45 arranged around the leg opening 1L. The leg elastic body 11 forms leg gathers. The leak-proof cuff forming elastic body 45 forms three-dimensional gathers.

[0061] The first to fourth elastic bodies 71 to 74, the leg elastic body 11, and the leak-proof cuff forming elastic body 45 can preferably be thread-like (e.g., elastic thread) or string-like (e.g., flat elastic) materials with a rectangular, square, circular, or polygonal cross-section, or multifilament type thread-like materials. The materials for the first to fourth elastic bodies 71 to 74, the leg elastic body 11, and the leak-proof cuff forming elastic body 45 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.

[0062] Examples of the fineness and elongation ratio of the multiple elastic materials arranged in the outer casing 5 are given below. However, the fineness and elongation ratio are not limited to those listed here. The first elastic material 71 is an elastic material with a fineness of 470 dtex and an elongation ratio of 3.2 times. The second elastic material 72 is an elastic material with a fineness of 310 dtex and an elongation ratio of 2.8 times. The third elastic material 73 is an elastic material with a fineness of 780 dtex and an elongation ratio of 2.7 times. The fourth elastic material 74 is an elastic material with a fineness of 620 dtex and an elongation ratio of 2.5 times.

[0063] In the dorsal portion 6, the four first elastic bodies 71, the three second elastic bodies 72, and the four third elastic bodies 73 are intermittently arranged at equal intervals (for example, a pitch of 5.5 mm) in the longitudinal direction X. In the dorsal portion 6, the spacing between the two upper fourth elastic bodies 74 and the spacing between the two lower fourth elastic bodies 74 is the same, and their pitch is, for example, 4.5 mm.

[0064] Except for the second elastic body 72 located in the ventral folded portion 85 of the ventral portion 3, the four second elastic bodies 72 and the four third elastic bodies 73 are intermittently arranged at equal intervals (for example, a pitch of 5.5 mm) in the longitudinal direction X. In the ventral portion 3, the spacing between the two upper fourth elastic bodies 74 and the spacing between the two lower fourth elastic bodies 74 are the same, and their pitch is, for example, 4.5 mm.

[0065] <Overall composition of absorbent article packaging> Referring to Figures 4(A) and (B), and Figure 5, the diaper packaging 100 as an absorbent article packaging according to this embodiment will be described. The diaper packaging 100 will also be referred to as "packaging 100" below. As shown in Figures 4(A) and (B), the packaging 100 comprises a packaging bag 20 and a plurality of the above-mentioned diapers 1. The packaging 100 has mutually orthogonal height directions H, width directions W, and depth directions D.

[0066] The packaging bag 20 is made of, for example, a flexible sheet material. The packaging bag 20 includes, for example, a sheet-like base material and a printed layer laminated on the base material. The base material mainly consists of a thermoplastic resin such as polyamide, polyester, polybutylene terephthalate, or polyethylene terephthalate. The printed layer consists of a known ink composition. By including the printed layer, various kinds of information can be printed on the packaging bag 20.

[0067] The packaging bag 20 has a front portion 21 and a rear portion 22 extending in the height direction H and the width direction W, respectively; an upper portion 23 and a lower portion 24 extending in the width direction W and the depth direction D, respectively; and a first side portion 25 and a second side portion 26 extending in the depth direction D and the height direction H, respectively. When unopened and containing a specified number of diapers 1, the packaging bag 20 is configured in a roughly hexagonal shape. That is, the front portion 21 and the rear portion 22 face each other in the depth direction D, the upper portion 23 and the lower portion 24 face each other in the height direction H, and the first side portion 25 and the second side portion 26 face each other in the width direction W.

[0068] The packaging bag 20 may further include a handle 27. The handle 27 is joined to the top portion 23, for example, by a joining means such as fusion bonding. The packaging bag 20 may also further include an opening guide portion 28, which is relatively less rigid and guides the user to cut and open the bag.

[0069] Typically, as shown in Figures 4(B) and 5, in the packaging 100, the diapers 1 are filled into the packaging bag 20 in a folded state, and the diapers 1 are arranged in a row in their thickness direction Z, and sealed so that pressure is applied in the thickness direction Z and a predetermined value of pressure is applied in a direction including a component in the longitudinal direction X.

[0070] In this specification, "upward in the height direction H" means the direction approaching the upper surface portion 23 of the substantially hexahedral packaging body 100, and "downward in the height direction H" means the direction approaching the lower surface portion 24 of the substantially hexahedral packaging body 100.

[0071] As shown in Figure 4(B), in the packaging 100, multiple diapers 1 are arranged side by side along the width direction W such that the dorsal side 6 of one diaper 1 and the ventral side 3 of the other diaper 1 are in contact along the width direction W, and one or more diaper groups 49 are housed in the height direction H. The number of diaper groups 49 is not particularly limited, but considering the ease of removing the diapers 1 from the packaging 100, it is preferably one to three levels, more preferably one or two levels. Figure 4(B) shows an example of packaging 100 that houses two levels of diaper groups 49, the bottom diaper group 49a and the top diaper group 49b. When there is no need to distinguish between diaper group 49a and diaper group 49b, they are referred to as diaper group 49.

[0072] In the example shown in Figure 4(B), multiple diapers 1 belonging to diaper group 49 are arranged along the width direction W from the first side portion 25 to the second side portion 26, with the ventral portion 3 and ventral crotch portion 93 facing the first side portion 25, the dorsal main body portion 61 and dorsal crotch portion 96 facing the second side portion 26, the crotch end portion 18 located on the upper portion 23 side (upward in the height direction H), and the waist end portion 17 located on the lower portion 24 side (downward in the height direction H). In the example shown in Figure 4(B), each diaper 1 is arranged with the waist end portion 17 located on the lower portion 24 side and the crotch end portion 18 located on the upper portion 23 side, but it may also be arranged with the waist end portion 17 located on the upper portion 23 side and the crotch end portion 18 located on the lower portion 24 side.

[0073] <Relationship between the thickness of the first and second dorsal regions of a diaper in its natural state> The characteristic form of the diaper 1 having the dorsal extension portion 60 of the present invention in its natural state will be described.

[0074] As shown in Figures 5 and 6, the diaper 1 having a dorsal extension portion 60 of the present invention has a configuration (referred to as configuration A) in which, in the dorsal waist region 30, no elastic material is provided in the dorsal first region 31, but elastic materials are provided in the dorsal second A region 32A and the dorsal second B region 32B.

[0075] By using this configuration, the diaper 1 removed from the packaging 100 can be made into an easy-to-wear diaper with reduced bending starting from the boundary portion 103. This will be explained in detail below.

[0076] In the diaper 1 equipped with a dorsal extension 60, the outer casing 5 is located only on the dorsal side of the dorsal extension 60, while the outer casing 5 is located on both the dorsal and ventral sides of the region below the dorsal extension 60. As a result, the dorsal extension is thinner and less rigid than the region below it, and tends to bend easily starting from the boundary 103.

[0077] However, in the diaper 1 of this embodiment, elastic bodies are provided in the dorsal second A region 32A and the dorsal second B region 32B, which are located above and below the boundary 103, respectively, in the dorsal portion 6. As a result, the rigidity of the dorsal second region 32 is higher than that of the region without elastic bodies. This relatively rigid dorsal second region 32 is provided in the vertical direction X, extending from the dorsal extension 60 to the dorsal main body 61, passing through the boundary 103, which is prone to bending. This makes the diaper 1 less susceptible to bending originating from the boundary 103.

[0078] In addition, in the diaper 1 of this embodiment, the dorsal extension portion 60 is configured such that no elastic material is placed in the dorsal first region 31, which is its end region, making it even less likely for bending to occur starting from the boundary portion 103. In other words, by configuring the first dorsal region 31 without an elastic body, the first dorsal region 31 is less affected by the contraction force of the elastic body and is more easily deformed. For this reason, in the package 100, in the multiple diapers 1 filled in the packaging bag 20, the first dorsal region 31 deforms by being crushed in the longitudinal direction X by the pressure applied in a direction including the longitudinal direction X component, and the diaper 1 in its natural state has a characteristic shape in which the length (thickness) d1 of the first dorsal region 31 in the thickness direction Z is longer than the length d2 of the second dorsal region 32 in the thickness direction Z. Having this characteristic shape makes the difference between the thickness d1 of the first dorsal region 31 and the thickness d3 of the waist overlap region C1 smaller compared to the case in which the thickness d1 of the first dorsal region 31 and the thickness d2 of the second dorsal region 32 are equal. Therefore, when filling the diaper 1 into the packaging 100, pressure is applied to the diaper 1 in its thickness direction Z, making it less likely for the dorsal extension to fold due to the difference in thickness. As shown in Figure 5, the diaper 1 can be filled into the packaging bag 20 in a firm, almost straight position (with the vertical direction X of the diaper 1 almost perpendicular to the bottom surface 24). This allows the diaper 1 to be removed from the packaging 100 with folds starting from the boundary portion 103 suppressed. Because folds are suppressed, the waist opening is easier to open, resulting in a diaper 1 that is easy to put on and use.

[0079] Furthermore, in the packaging 100, the diapers 1 are placed in the packaging bag 20 under pressure in their thickness direction Z. Therefore, the diapers at both ends of the width direction W of the diaper group 49, in other words, the diapers closest to the first side portion 25 and the second side portion 26, tend to be more prone to bending than the diapers 1 located near the center of the width direction W of the diaper group 49.

[0080] However, in the diaper 1 of this embodiment, as described above, in configuration A, the thickness d1 of the first dorsal region 31 is made longer than the thickness d2 of the second dorsal region 32 in its natural state, thereby reducing the difference between the thickness d1 of the first dorsal region 31 and the thickness d3 of the waist overlapping region C1. The relatively rigid second dorsal region 32 is provided so as to pass through the boundary portion 103 and traverse the boundary portion 103 in the vertical direction X. As a result, even diapers located at both ends in the width direction of the diaper group 49 within the packaging body 100, which tend to bend easily, can be filled into the packaging bag 20 in a firm, almost straight state (with the vertical direction X of the diaper 1 almost perpendicular to the bottom portion 24), as shown in Figures 4(B) and 5. This makes it possible to remove the diaper 1 from the packaging body 100 in a state where bending is suppressed, resulting in an easy-to-use diaper 1 that is easy for the wearer to put on.

[0081] From the viewpoint of suppressing bending of the diaper 1 within the packaging 100, the thickness (length in the thickness direction Z) d1 of the dorsal first region 31 is preferably 4.4 mm or more and 14 mm or less, the thickness d2 of the dorsal second region 32 is preferably 4 mm or more and 7 mm or less, the thickness d3 of the waist overlap region C1 is preferably 8 mm or more and 14 mm or less, the thickness d4 of the ventral waist region 90 is preferably 4 mm or more and 7 mm or less, and the difference between d1 and d3 is preferably 3.6 mm or more and 6.3 mm or less (however, d3 > d1).

[0082] As shown in Figure 6, in the natural state of the diaper 1, it is preferable that the dorsal first region 31 bulges toward the skin. This configuration allows the length d5 ​​in the thickness direction Z between the skin-facing surface of the dorsal first region 31 and the non-skin-facing surface of the ventral region 3 to be shorter than the thickness d4 of the ventral waist region 90. This further suppresses the bending of the dorsal extension 60 towards the ventral side starting from the boundary portion 103, allowing the diaper 1 to be filled into the packaging bag 20 in a more firmly upright, almost straight position (with the vertical direction X of the diaper 1 almost perpendicular to the bottom portion 24). As a result, the diaper 1 can be removed from the packaging 100 in a state where bending is suppressed, making it an easy-to-use diaper 1 that is easy for the wearer to put on.

[0083] In the natural state of the diaper 1, the configuration that causes the dorsal first region 31 to bulge toward the skin can be achieved by not providing an elastic material in the dorsal folded portion 80, as shown in Figures 3 and 6. In addition, the presence of an elastic body in the ventral folded portion 85 of the ventral first region 91 makes it easier to make the dorsal first region 31 bulge out more towards the skin.

[0084] <More detailed configuration> [Adhesion configuration between the dorsal folded portion and the dorsal opposing portion, adhesion configuration between the ventral folded portion and the ventral opposing portion] As shown in Figures 3 and 6, the ventral folded portion 85 and the ventral opposing portion 86 may be bonded together with ventral adhesive 19a, and the dorsal folded portion 80 and the dorsal opposing portion 81 may be bonded together with dorsal adhesive 19b. The materials used for the ventral adhesive 19a and the dorsal adhesive 19b can be any materials used in the art without particular limitations.

[0085] As shown in Figure 3, the back portion 6 has a back adhesive-existing region 83 in which a back adhesive 19b that bonds the back folded portion 80 and the back opposing portion 81 exists in the longitudinal direction X, and a back adhesive-absent region 82 in which the back adhesive 19b does not exist in the longitudinal direction X, in the region where the back folded portion 80 and the back opposing portion 81 exist opposite each other in the thickness direction Z. In the example shown in Figure 3, in the region where the back folded portion 80 and the back opposing portion 81 exist opposite each other in the thickness direction Z, the back adhesive-absent region 82, the back adhesive-existing region 83, and the back adhesive-absent region 82 are located in order from the back waist end 102 toward the leg opening 1L side (crotch side). The back adhesive-absent region 82 located toward the back waist end 102 includes the back waist end 102 and is a region where the back adhesive 19b does not exist in the longitudinal direction X from the back waist end 102. The ventral portion 3 has a ventral adhesive-existing region 88 in which a dorsal adhesive 19a that bonds the ventral folded portion 85 and the ventral opposing portion 86 exists in the longitudinal direction X, and a ventral adhesive-absent region 87 in which the ventral adhesive 19a does not exist in the longitudinal direction X, in the region where the ventral folded portion 85 and the ventral opposing portion 86 exist opposite each other in the thickness direction Z. In the example shown in Figure 3, in the region where the ventral folded portion 85 and the ventral opposing portion 86 exist opposite each other in the thickness direction Z, the ventral adhesive-absent region 87, the ventral adhesive-existing region 88, and the ventral adhesive-absent region 87 are located in order from the ventral waist end 101 toward the leg opening 1L side (crotch side). The ventral adhesive-absent region 88 located toward the ventral waist end 101 includes the ventral waist end 101 and is a region where the ventral adhesive 19a does not exist in the longitudinal direction X from the ventral waist end 101. The dorsal adhesive-free region 82 is longer in length X in the longitudinal direction than the ventral adhesive-free region 87.

[0086] With this configuration, in the dorsal waist region 30 of the diaper 1 in its natural state, the space formed by the two overlapping outer layers not being adhered to each other in the thickness direction Z can be made longer in the vertical direction X than in the ventral waist region 90.

[0087] As shown in Figure 3, in the diaper 1 of this embodiment, the dorsal adhesive-free region 82 is provided along the entire length in the vertical direction X of the dorsal first region 31, and further, it is provided along the entire length in the vertical direction X of the dorsal extension 60, making it easier to make the dorsal first region 31 bulge in the thickness direction Z.

[0088] In addition to configuring the structure so that the thickness d1 of the dorsal first region 31 is longer than the thickness d2 of the dorsal second region 32 in its natural state, by arranging the ventral adhesive 19a and dorsal adhesive 19b so that the length of the dorsal adhesive-free region 82 is longer in the longitudinal direction X than the ventral adhesive-free region 87, it becomes easier to design the structure so that the difference between the thickness d1 of the dorsal first region 31 and the thickness d3 of the waist overlap region C1 is small. In other words, by making the length in the longitudinal direction X of the ventral adhesive-free region 87 of the ventral waist region 90 shorter than the length in the longitudinal direction X of the dorsal adhesive-free region 82 of the dorsal waist region 30, the thickness d4 of the ventral waist region 90 can be made less likely to become thick, while the thickness d1 of the dorsal first region 31 can be made thicker. Therefore, it becomes easier to design the structure so that the difference between the thickness d1 of the dorsal first region 31 and the thickness d3 of the waist overlap region C1 is small.

[0089] In a diaper 1 in its natural state, from the viewpoint of making it easier to design so that the difference between the thickness d1 of the dorsal first region 31 and the thickness d3 of the waist overlap region C1 is small, the thickness d1 of the dorsal first region 31 is preferably 1.1 times or more and 2 times or less, and more preferably 1.3 times or more and 1.6 times or less, the thickness d4 of the ventral first region 91.

[0090] [Detailed structure of the dorsal extension] In the dorsal extension portion 60, it is preferable that the outer layer sheet 51 and the inner layer sheet 52 are bonded together in the dorsal opposing portion 81, while the outer layer sheet 51 and the inner layer sheet 52 are not bonded together in the dorsal folded portion 80.

[0091] This configuration makes it easier to make the dorsal first region 31 bulge towards the skin, making it easier to increase the thickness of the dorsal first region 31 and making it easier to further reduce the difference between the thickness d1 of the dorsal first region 31 and the thickness d3 of the waist overlap region C1. As a result, the bending of the dorsal extension portion 60 towards the ventral side starting from the boundary portion 103 can be further suppressed, and the diaper 1 can be filled into the packaging bag 20 in a more firmly upright, almost straight state (the vertical direction X of the diaper 1 is almost perpendicular to the bottom portion 24). As a result, the diaper 1 can be removed from the packaging body 100 in a state where bending is suppressed, making it an easy-to-use diaper 1 that is easy for the wearer to put on.

[0092] The outer layer sheet 51 and the inner layer sheet 52 may be bonded together by an adhesive, or by a joint consisting of a partially provided heat seal, as described later.

[0093] [Example of joining an outer layer sheet to an inner layer sheet] As shown in Figures 7(A) and (B), the outer covering 5 in the ventral portion 3 and dorsal portion 6 may be configured such that the outer sheet 51 and the inner sheet 52 are joined by joints 58 which are partially provided heat seals. The joints 58 are intermittently arranged in both the longitudinal direction X and the transverse direction Y. Multiple elastic bodies (shown as the second elastic body 72 in Figure 7(A) and the first elastic body 71 in Figure 7(B)) are arranged so as not to pass through the joints 58. Each of the multiple elastic bodies is joined to the outer sheet 51 and the inner sheet 52 only at the ends in the longitudinal direction where they are located on or near the side reinforcement portion 105, or only where they are located on or near the side seal 8, and is not joined to the outer sheet 51 and the inner sheet 52 in the central part in the longitudinal direction. In the outer casing 5 with this configuration, the outer layer sheet 51 and the inner layer sheet 52 each form multiple vertical folds that extend continuously in the longitudinal direction X across multiple elastic bodies, both in the natural state and when the diaper 1 is worn. The vertical folds are formed on both sides of the laminate of the outer layer sheet 51 and the inner layer sheet 52. The above-mentioned heat seals include heat seals and ultrasonic seals.

[0094] As shown in Figures 7(A) and (B), the lateral Y pitch (center-to-center distance) b of the multiple intermittently arranged joints 58 in the lateral Y direction on the dorsal portion 6 may be wider than the lateral Y pitch (center-to-center distance) a of the multiple intermittently arranged joints 58 in the lateral Y direction on the ventral portion 3. This configuration allows the thickness of the longitudinal folds of the dorsal portion 6 to be greater than that of the longitudinal folds of the ventral portion 3, making it easier to reduce the difference between the thickness d1 of the dorsal first region 31 and the thickness d3 of the waist overlap region C1. This further suppresses the bending of the dorsal extension portion 60 starting from the boundary portion 103, allowing the diaper 1 to be filled into the packaging bag 20 in a more firmly upright, almost straight position (with the longitudinal direction X of the diaper 1 almost perpendicular to the bottom portion 24). As a result, the diaper 1 can be removed from the packaging body 100 in a state where bending is suppressed, making it an easy-to-use diaper 1 that is easy for the wearer to put on.

[0095] In this example, the joint 58 is formed by heat sealing, but the joint 58 may be formed by other joining means, for example, by hot melt adhesive. From the viewpoint of making it feel better against the skin, it is more preferable to form the joint 58 by heat sealing. That is, by not having adhesive between the outer layer sheet 51 and the inner layer sheet 52, and by not fixing the central part of the elastic body in the longitudinal direction to both sheets, the outer casing 5 can be made soft to the touch, resulting in a diaper 1 that feels good against the skin.

[0096] <Method for measuring the thickness of the outer casing (laminated structure)> The thickness of the dorsal first region 31, the dorsal second region 32, the ventral first region 91, and the waist overlap region C1 can be measured as follows. The diaper 1 removed from the packaging 100 is separated by the side seal 8 and unfolded, and the dorsal waist region 30 (including the dorsal first region 31, dorsal second region 32, and ventral first region 91) is cut out to prepare the measurement sample S. Using a laser thickness gauge (Omron Corporation, high-precision displacement sensor ZS-LD80 (product name)), as shown in Figure 8, a flat plate 201 is used to measure 0.5 gf / cm² against the measurement sample S placed on a flat platform. 2 A load (0.05 kPa) is applied to one side, and the thickness d is measured in that state. The sample S is not stretched during measurement. Three measurements are taken in each of the dorsal first region 31, dorsal second region 32, and ventral first region 91, and the average value is taken as the thickness of each measurement target (dorsal first region 31, dorsal second region 32, and ventral first region 91). At this time, the measurement target locations are determined so that the thickest point in each region is included. The above "0.5 gf / cm 2 "Load" refers to a load sufficient to suppress fuzzing or other issues on the surface of the object being measured, and is a minor load necessary to properly measure the total thickness of the sample S (a minor load that does not amount to a compressive force that would crush the thickness of the thermoplastic sheet constituting the outer casing).

[0097] The thickness of the waist overlap region C1 can be measured as follows: From the diaper 1, which is in its natural, folded state and removed from the packaging 100, the waist overlap region C1 is cut out to be the measurement target, and a measurement sample S is prepared. The thickness d of the measurement sample S is measured using the same method as the measurement of the thickness of the dorsal first region 31, the dorsal second region 32, and the ventral first region 91 described above.

[0098] <How to confirm that the first dorsal region is bulging towards the skin> In diapers, the fact that the dorsal first region 31 bulges towards the skin can be confirmed by the following method. As shown in Figure 9, the diaper 1 is separated at the side seal 8 and unfolded, the dorsal waist region 30 is cut out, and the diaper is grasped using a gripping device 300 having a pair of gripping parts 301. At this time, the pair of gripping parts 301 grasp the pair of dorsal extension side edges 104 of the dorsal extension 60 of the diaper 1 in such a way that the elastic material provided in the diaper 1 does not stretch and the dorsal extension 60 does not sag. In the figure, the dashed line L is a hypothetical straight line connecting the predetermined gripping positions of each of the pair of gripping parts 301. When the diaper 1 grasped by the gripping device 300 is observed from above (waist side) in the vertical direction X, if the length from the dashed line L to the non-skin-facing surface 6b is longer than the length from the dashed line L to the skin-facing surface 6a, it can be determined that the diaper is bulging towards the skin.

[0099] <Other Embodiments> 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 invention.

[0100] The absorbent pant-type article according to the present invention does not have to be a disposable diaper for infants; for example, it may be a disposable diaper for adults or children. Furthermore, the absorbent pant-type 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 absorbent pant-type articles include sanitary napkins in pant form.

[0101] Furthermore, while the above embodiment of diaper 1 shows an example in which the outer casing 5 has a configuration in which the ventral portion 3, the dorsal portion 6, and the crotch area 9 are integrated, the invention is not limited to this. For example, the outer casing may be divided into a ventral portion and a dorsal portion. This divided diaper consists of a rectangular ventral portion positioned on the wearer's ventral side, a rectangular dorsal portion positioned on the wearer's dorsal side, and a crotch area including an absorbent body fixed across the ventral and dorsal portions. The dorsal portion has a dorsal extension and a dorsal main body, and the side edges of the dorsal main body and the side edges of the ventral portion are joined to form a pair of side seals. Even with this type of split diaper, it is possible to create a diaper that is less prone to folding.

[0102] With regard to the embodiments of the present invention described above, the following additional information is disclosed.

[0103] <1> A pant-type absorbent article having a waist opening and a pair of leg openings, comprising an absorbent body and an outer body disposed on the non-skin-facing side of the absorbent body, having a longitudinal direction extending from the wearer's abdominal side through the crotch to the back, a transverse direction perpendicular to the longitudinal direction, and a thickness direction perpendicular to the longitudinal and transverse directions, 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 dorsal portion 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 ventral portion has a ventral folded portion formed by folding the outer body back toward the skin-facing surface along the transverse direction of the ventral waist end, and a ventral opposing portion that faces the ventral folded portion in the thickness direction. The back portion has a back folded portion formed by folding the outer body back toward the skin-facing surface along the lateral direction of the back waist end, and a back opposing portion that faces the back folded portion in the thickness direction. In the aforementioned dorsal extension, the dorsal folded portion and the dorsal opposing portion overlap in the thickness direction. The exterior body comprises a laminated outer layer sheet and an inner layer sheet, and a plurality of laterally stretchable elastic bodies that extend laterally and are arranged between the outer layer sheet and the inner layer sheet. The absorbent body has a front end and a rear end that are opposite to each other in the longitudinal direction, The front end is located on the ventral side, and the rear end is located on the dorsal side. The ventral portion has a ventral waist region which is the area from the ventral waist end to the anterior end in the longitudinal direction. The dorsal portion has a dorsal waist region which is the area from the dorsal waist end to the rear end in the longitudinal direction. The dorsal waist region includes the dorsal extension, The dorsal waist region is a region divided into two in the longitudinal direction: a first dorsal region which is a region of a predetermined longitudinal length from the dorsal waist end to the leg opening side, including the dorsal waist end; and a second dorsal region which is adjacent to the first dorsal region and is located closer to the leg opening than the first dorsal region. The dorsal second region comprises a dorsal second A region located in the dorsal extension and a dorsal second B region located in the dorsal main body. The dorsal extension includes the dorsal first region and the dorsal second A region. The elastic body is arranged in the dorsal waist region and the ventral waist region, respectively. In the aforementioned dorsal waist region, the elastic body is not disposed in the dorsal first region, but is disposed in the dorsal second A region and the dorsal second B region. The elastic body is not disposed in the dorsal folded portion, but is disposed in the ventral folded portion. In its natural state, the first dorsal region has a longer length in the thickness direction than the second dorsal region. Absorbent pants. <2> The aforementioned dorsal first region bulges toward the skin side. The aforementioned <1> The absorbent pant-type article described in 1. <3> The ventral waist region includes a ventral first region which is a region of a predetermined longitudinal length from the ventral waist end, including the ventral waist end, toward the leg opening side, The length in the thickness direction of the dorsal first region is longer than the length in the thickness direction of the ventral first region. The aforementioned <1> or <2> Absorbent pant-type articles as described above. <4> The length in the thickness direction of the dorsal first region is 1.1 times or more and 2 times or less the length in the thickness direction of the ventral first region. The aforementioned <3> Absorbent pant-type articles as described above. <5> In the dorsal extension portion, the outer layer sheet and the inner layer sheet are bonded together in the dorsal opposing portion, while the outer layer sheet and the inner layer sheet are not bonded together in the dorsal folded portion. The aforementioned <1> ~ <4> A pant-type absorbent article described in any one of the following. <6> The back portion has a back adhesive region where a back adhesive exists that adheres the back folded portion and the back opposing portion. The dorsal portion has a dorsal adhesive-free region in the longitudinal direction from the dorsal waist end where the dorsal adhesive is absent. The ventral portion has a dorsal adhesive region where a ventral adhesive is present to bond the ventral folded portion to the ventral folded portion, The ventral portion has a ventral adhesive-free region in the longitudinal direction from the ventral waist end where the ventral adhesive is absent. The dorsal adhesive-free region is longer in the longitudinal direction than the ventral adhesive-free region. The aforementioned <1> ~ <5> A pant-type absorbent article described in any one of the following. <7> The dorsal portion and the ventral portion each have a plurality of joints where the outer layer sheet and the inner layer sheet are partially joined. The lateral pitch of the plurality of joints in the dorsal waist region is wider than the lateral pitch of the plurality of joints in the ventral waist region. The absorbent article according to claim 1 or 2. The aforementioned <1> ~ <6> A pant-type absorbent article described in any one of the following. <8> The joint is formed by heat sealing or hot melt adhesive. The aforementioned <7> Absorbent pant-type articles as described above. <9> 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 aforementioned <1> ~ <8> A pant-type absorbent article described in any one of the following. <10> The outer casing comprises the ventral portion, the dorsal portion, and a pair of side seals formed by joining the lateral edge of the ventral portion and the lateral edge of the dorsal portion, respectively. The pair of side reinforcing portions are continuous with the pair of side seals and extend in the direction including the longitudinal component. The side seal and the side reinforcement each include a plurality of sealing portions formed by pressurizing means and / or heating means. The aforementioned <9> Absorbent pant-type articles as described above. <11> The aforementioned rear end and the aforementioned front end are located at the same position in the longitudinal direction. The aforementioned <1> ~ <10> A pant-type absorbent article described in any one of the following. <12> The longitudinal length of the dorsal extension is 10 mm or more and 40 mm or less. The aforementioned <1> ~ <11> A pant-type absorbent article described in any one of the following. <13> The longitudinal length of the dorsal first region and the longitudinal length of the ventral first region are the same, and are between 5 mm and 10 mm. The aforementioned <1> ~ <12> A pant-type absorbent article described in any one of the following. <14> The elastic body disposed in the rear main body is disposed in the rear opposing portion and the portion of the outer body that extends toward the leg opening side connected to the rear opposing portion, and is not disposed in the rear folded portion. The aforementioned <1> ~ <13> A pant-type absorbent article described in any one of the following. <15> The length in the thickness direction of the first region on the back side is 4.4 mm or more and 14 mm or less. The length in the thickness direction of the second region on the back side is 4 mm or more and 7 mm or less. The aforementioned <1> ~ <14> A pant-type absorbent article described in any one of the following. <16> The length in the thickness direction of the ventral waist region is 4 mm or more and 7 mm or less. The aforementioned <1> ~ <15> A pant-type absorbent article described in any one of the following. <17> In its natural state, the ventral waist region and the dorsal waist region have a waist overlapping region which is the region where they overlap in the thickness direction. The length in the thickness direction of the waist overlapping region is 8 mm or more and 14 mm or less. The aforementioned <1> ~ <16> A pant-type absorbent article described in any one of the following. <18> The ventral waist region comprises a first ventral region which is a region of a predetermined longitudinal length from the ventral waist end, including the ventral waist end, toward the leg opening, and a second ventral region which is a region toward the leg opening than the first ventral region. The plurality of elastic bodies include first to fourth elastic bodies with different finenesses from each other. All of the elastic bodies arranged on the back side are located on the back side opposing portion and on the portion of the outer body that extends from the back side opposing portion toward the leg opening side, and no elastic bodies are located on the back side folded portion. In the dorsal extension, no elastic body is provided in the dorsal first region, and two first elastic bodies are provided in the dorsal opposing portion of the dorsal second A region. In the dorsal main body portion, two first elastic bodies and one second elastic body are arranged in the dorsal 2B region, and in the region below the dorsal 2B region, two second elastic bodies, four third elastic bodies, and four fourth elastic bodies are arranged in order from the dorsal waist end side toward the leg opening side. In the ventral first region, one second elastic body is provided in the ventral folded portion, and one second elastic body is provided in the ventral opposing portion. In the ventral second region, no elastic body is provided in the ventral folded portion, and two second elastic bodies are provided in the ventral opposing portion. In the region of the ventral portion below the ventral waist region, no elastic body is provided in the ventral folded portion, and in the ventral opposing portion and the portion of the outer body that extends toward the leg opening side connected to the ventral opposing portion, one second elastic body, four third elastic bodies, and four fourth elastic bodies are provided in order from the ventral waist end side toward the leg opening side. The aforementioned <1> ~ <17> A pant-type absorbent article described in any one of the following. <19> The first elastic material is an elastic material with a fineness of 470 dtex and an elongation ratio of 3.2 times. The second elastic material has a fineness of 310 dtex and an elongation ratio of 2.8 times. The third elastic material is an elastic material with a fineness of 780 dtex and an elongation ratio of 2.7 times. The fourth elastic material is an elastic material with a fineness of 620 dtex and an elongation ratio of 2.5 times. The aforementioned <1> ~ <18> A pant-type absorbent article described in any one of the following. <20> In the dorsal portion, the four first elastic bodies, three second elastic bodies, and four third elastic bodies arranged in the dorsal portion are intermittently arranged at equal intervals in the longitudinal direction, and among the four fourth elastic bodies arranged in the dorsal portion, the spacing between the two upper fourth elastic bodies and the spacing between the two lower fourth elastic bodies are the same. The aforementioned <18> or <19> Absorbent pant-type articles as described above. <21> In the ventral portion, of the five second elastic bodies arranged in the ventral portion, four second elastic bodies excluding the second elastic body arranged in the ventral folded portion, and the four third elastic bodies arranged in the ventral portion are intermittently arranged at equal intervals in the vertical direction, and of the four fourth elastic bodies arranged in the ventral portion, the spacing between the two upper fourth elastic bodies and the spacing between the two lower fourth elastic bodies are the same. The aforementioned <18> ~ <20> A pant-type absorbent article described in any one of the following. <22> A packaging bag and a plurality of the above which are contained in the packaging bag <1> ~ <21> An absorbent article packaging comprising an absorbent article described in any one of the above, and having mutually orthogonal height, width and depth directions, The aforementioned packaging bag is The front and rear portions extend in the height direction and the width direction, respectively, An upper portion and a lower portion extending in the width direction and the depth direction, respectively, It has a first side portion and a second side portion that extend in the depth direction and the height direction, respectively, The absorbent article is placed in the packaging bag in a folded state with the ventral portion and the dorsal main body portion overlapping in the thickness direction. The absorbent article, when folded in half, has a waist end that is positioned at the wearer's waist and a crotch end that is positioned between the wearer's legs. In the absorbent article packaging, at least a plurality of absorbent articles arranged along the width direction are considered as one layer of absorbent articles, and one or more layers of absorbent article groups are housed in the height direction. Multiple absorbent articles belonging to the group of absorbent articles are arranged along the width direction from the first side to the second side, with the ventral portion and the dorsal main body portion facing the first side portion and the second side portion, respectively, and the crotch end portion located above the height direction and the waist end portion located below the height direction. Absorbent article packaging. [Explanation of Symbols]

[0104] 1. Absorbent pants (disposable diapers, diapers) 1W…Waist opening 1L... Leg opening 3...Ventral part 4… Absorbent body 5…Exterior 6...Dorsal part 30…Dorsal waist region 31…Dorsal 1st region 32...Dorsal second region 32A…Dorsal 2nd A area 32B…Dorsal 2nd B area 51…Outer layer sheet 52…Inner layer sheet 60...Dorsal extension part 61...Dorsal body part 71...First elastic body (elastic body) 72...Second elastic body (elastic body) 73...Third elastic body (elastic body) 74…Fourth elastic body (elastic body) 80... Back fold section 81...Dorsal opposing part 85...Ventral fold 86...Ventral opposing part 90...Ventral waist region 101...Ventral waist end 102...Rear waist end

Claims

1. A pant-type absorbent article having a waist opening and a pair of leg openings, comprising an absorbent body and an outer body disposed on the non-skin-facing side of the absorbent body, having a longitudinal direction extending from the wearer's abdominal side through the crotch to the back, a transverse direction perpendicular to the longitudinal direction, and a thickness direction perpendicular to the longitudinal and transverse directions, 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 dorsal portion 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 ventral portion has a ventral folded portion formed by folding the outer body back toward the skin-facing surface along the transverse direction of the ventral waist end, and a ventral opposing portion that faces the ventral folded portion in the thickness direction. The back portion has a back folded portion formed by folding the outer body back toward the skin-facing surface along the lateral direction of the back waist end, and a back opposing portion that faces the back folded portion in the thickness direction. In the aforementioned dorsal extension, the dorsal folded portion and the dorsal opposing portion overlap in the thickness direction. The exterior body comprises a laminated outer layer sheet and an inner layer sheet, and a plurality of laterally stretchable elastic bodies that extend laterally and are arranged between the outer layer sheet and the inner layer sheet. The absorbent body has a front end and a rear end that are opposite to each other in the longitudinal direction, The front end is located on the ventral side, and the rear end is located on the dorsal side. The ventral portion has a ventral waist region which is the area from the ventral waist end to the anterior end in the longitudinal direction. The dorsal portion has a dorsal waist region which is the area from the dorsal waist end to the rear end in the longitudinal direction. The dorsal waist region includes the dorsal extension, The dorsal waist region is a region divided into two in the longitudinal direction: a first dorsal region which includes the dorsal waist end and extends for a predetermined longitudinal length from the dorsal waist end toward the leg opening; and a second dorsal region which is adjacent to the first dorsal region and is located toward the leg opening than the first dorsal region. The dorsal second region comprises a dorsal second A region located in the dorsal extension and a dorsal second B region located in the dorsal main body. The dorsal extension includes the dorsal first region and the dorsal second A region, The elastic body is arranged in the dorsal waist region and the ventral waist region, respectively. In the aforementioned dorsal waist region, the elastic body is not disposed in the dorsal first region, but is disposed in the dorsal second A region and the dorsal second B region. The elastic body is not disposed in the dorsal folded portion, but is disposed in the ventral folded portion. In its natural state, the first dorsal region has a longer length in the thickness direction than the second dorsal region. Absorbent pants.

2. The aforementioned dorsal first region bulges toward the skin side. The pant-type absorbent article according to claim 1.

3. The ventral waist region includes a ventral first region which is a region of a predetermined longitudinal length from the ventral waist end, including the ventral waist end, toward the leg opening side, The length in the thickness direction of the dorsal first region is longer than the length in the thickness direction of the ventral first region. The absorbent article according to claim 1 or 2.

4. In the dorsal extension portion, the outer layer sheet and the inner layer sheet are bonded together in the dorsal opposing portion, while the outer layer sheet and the inner layer sheet are not bonded together in the dorsal folded portion. The absorbent article according to claim 1 or 2.

5. The back portion has a back adhesive-containing region where back adhesive exists to bond the back folded portion and the back opposing portion, and a back adhesive-free region where back adhesive does not exist in the longitudinal direction from the back waist end. The ventral portion has a ventral adhesive-containing region where ventral adhesive exists to bond the ventral folded portion and the ventral opposing portion, and a ventral adhesive-free region where the ventral adhesive does not exist in the longitudinal direction from the ventral waist end. The dorsal adhesive-free region is longer in the longitudinal direction than the ventral adhesive-free region. The absorbent article according to claim 1 or 2.

6. The dorsal portion and the ventral portion each have a plurality of joints where the outer layer sheet and the inner layer sheet are partially joined. The lateral pitch of the plurality of joints in the dorsal waist region is wider than the lateral pitch of the plurality of joints in the ventral waist region. The absorbent article according to claim 1 or 2.

7. An absorbent article packaging comprising a packaging bag and a plurality of absorbent articles according to claim 1 or 2 contained in the packaging bag, wherein the packaging body has mutually orthogonal height, width and depth directions, The aforementioned packaging bag is The front and rear portions extend in the height direction and the width direction, respectively, An upper portion and a lower portion extending in the width direction and the depth direction, respectively, It has a first side portion and a second side portion that extend in the depth direction and the height direction, respectively, The absorbent article is placed in the packaging bag in a folded state with the ventral portion and the dorsal main body portion overlapping in the thickness direction. The absorbent article, when folded in half, has a waist end that is positioned at the wearer's waist and a crotch end that is positioned between the wearer's legs. In the absorbent article packaging, at least a plurality of absorbent articles arranged along the width direction are considered as one layer of absorbent articles, and one or more layers of absorbent article groups are housed in the height direction. Multiple absorbent articles belonging to the group of absorbent articles are arranged along the width direction from the first side to the second side, with the ventral portion and the dorsal main body portion facing the first side portion and the second side portion, respectively, and the crotch end portion located above the height direction and the waist end portion located below the height direction. Absorbent article packaging.

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