Absorbent article storage body and absorbent article

Abstract

The invention provides an absorptive article storage body and an absorptive article which are easy to achieve both compactness and absorptivity maintenance. A plurality of absorbent articles are housed as a stacked absorbent article group, each absorbent article having an absorbent core and a skin-side core wrap adjacent to the skin-side surface of the absorbent core, the skin-side core wrap being configured from a base material layer and a fiber layer, the fiber layer being provided with thermoplastic resin fibers of 18 gsm or more, and the fiber layer being provided with thermoplastic resin fibers of 18 gsm or more. The length of the absorbent article group in the predetermined direction of the unopened absorbent article storage body is 70% or less of the length of the absorbent article group in the predetermined direction after 96 hours elapsed since the absorbent article storage body is opened and the absorbent article group is taken out. The absorption rate in the absorption rate test of the absorbent article after 5 minutes has elapsed since the absorbent article storage body is unsealed and the absorbent article is taken out is 85% or more of the absorption rate in the absorption rate test of the absorbent article after 96 hours has elapsed since the absorbent article storage body is unsealed and the absorbent article is taken out.

Description

Technical Field

[0001] The present invention relates to an absorbent article storage body and an absorbent article. Background Art

[0002] Generally speaking, absorbent articles such as disposable diapers are circulated and sold in the form of a package (absorbent article storage body) stored in a storage member such as a plastic bag, as described in Patent Document 1. The package is usually circulated by transportation means such as trucks, but as the amount of transportation increases, the amount of waste gas such as carbon dioxide is increased, which will burden the environment, so it is desired to make the package compact (miniaturized). In order to make the package compact, for example, it is known that the absorbent article is compressed as described in Patent Document 1.

[0003] Prior art literature

[0004] Patent Literature

[0005] Patent Document 1: Japanese Patent Application No. 2013-505796 Summary of the invention

[0006] Problem that the invention aims to solve

[0007] However, the more the absorbent article is compressed, the more compact the package becomes. On the other hand, the more the absorbent article is compressed, the more the absorbent core is flattened or deformed. Therefore, the absorbency of the absorbent article for excrement may decrease.

[0008] The present invention has been made in view of the above-mentioned conventional problems, and an object of the present invention is to provide an absorbent article storage body that can easily achieve both compactness of the absorbent article storage body and maintenance of the absorbency of the absorbent article.

[0009] Solutions for solving problems

[0010] The main scheme for achieving the above-mentioned purpose is an absorbent article storage body, which comprises: a plurality of absorbent articles; and a storage piece, which stores a plurality of the absorbent articles, characterized in that the plurality of the absorbent articles are stored in the storage piece as a group of absorbent articles stacked in a predetermined direction, and the absorbent articles comprise: an absorbent core, which has at least liquid-absorbent fibers and a highly absorbent polymer; and a skin-side core wrap, which is arranged adjacent to the skin side of the absorbent core, the skin-side core wrap being composed of a base material layer and a fiber layer, the fiber layer being provided with thermoplastic resin fibers of 18 gsm or more, and the unopened The length of the absorbent article group in the absorbent article storage body in the predetermined direction is less than 70% of the length of the absorbent article group in the predetermined direction after 96 hours have passed since the absorbent article storage body was unsealed and the absorbent article group was taken out, and the absorption rate in an absorption rate test of the absorbent articles after 5 minutes have passed since the absorbent article storage body was unsealed and the absorbent articles were taken out is more than 85% of the absorption rate in the absorption rate test of the absorbent articles after 96 hours have passed since the absorbent article storage body was unsealed and the absorbent articles were taken out.

[0011] Other features of the present invention will become apparent from the description of this specification and the accompanying drawings.

[0012] Effects of the Invention

[0013] According to the present invention, it is easy to achieve both compactness of the absorbent article storage body and maintenance of the absorbency of the absorbent article. BRIEF DESCRIPTION OF THE DRAWINGS

[0014] Figure 1 It is a perspective view of the storage body 100 .

[0015] Figure 2 It is a schematic perspective view of the diaper 1.

[0016] Figure 3 It is a top view of the diaper 1 in the unfolded and stretched state.

[0017] Figure 4 It is along Figure 3 A schematic cross-sectional view of line AA.

[0018] Figure 5A is a top view of the absorbent body 10, Figure 5B It is a schematic cross-sectional view of the absorbent body 10 .

[0019] Figure 6 This is a diagram of the storage body 100 as viewed from the front.

[0020] Figure 7A is a diagram showing the diaper set R in a stored state as viewed from the front. Figure 7 B is a diagram showing the diaper set R in a restored state as viewed from the front surface.

[0021] Figure 8 A is an enlarged schematic diagram of the absorbent body 11 in a compressed state. Figure 8 B is an enlarged schematic diagram of the absorbent body 11 in a restored state.

[0022] Fig. 9 It is a graph showing the results of the absorption rate test.

[0023] Fig.10 It is a plan view of the absorbent body 10 when the absorbent body 11 includes the compressed portion e.

[0024] Description of Reference Numerals

[0025] 1. Diaper (disposable diaper of underpants type, absorbent article); 10. Absorbent body; 11. Absorbent body; 11a. Absorbent core; 11b. Core wrap sheet; 11ba. Skin side core wrap portion; 11bb. Non-skin side core wrap portion; 11c. Narrowing portion; 12. Top sheet (skin side sheet); 13. Bottom sheet; 14. Outer sheet; 15. Leakage-proof wall portion; 16. Leakage-proof wall elastic member; 17. Leg elastic member; 20. Waist member; 30. Front waist portion; 30sw. Side portion; 31. Skin side sheet; 32. Non-skin side sheet; 32f. Folding portion; 35. Waist elastic member; 36. Skin top sheet; 40. Back Side waist portion; 40b, hip cover; 40sw, side portion; 41, skin side piece; 42, non-skin side piece; 42f, folded portion; 45, waist elastic member; 46, skin surface piece; 47, curved elastic member; 50, side joint portion; 100, storage body (absorbent article storage body); 120, storage piece; 121, handle area; 122, handle portion; 200, surface; 200A, front surface; 200B, side; 200D, upper surface; bb, base material layer; bf, fiber layer; e, compressed portion; n, non-compressed portion (low-density portion); BH, waist opening; LH, leg opening; R, diaper group. DETAILED DESCRIPTION

[0026] At least the following matters will become clear through the description of this specification and the accompanying drawings.

[0027] (Method 1)

[0028] An absorbent article storage body, comprising: a plurality of absorbent articles; and a storage piece for storing the plurality of absorbent articles, characterized in that the plurality of absorbent articles are stored in the storage piece as an absorbent article group stacked in a predetermined direction, the absorbent articles comprising: an absorbent core, which has at least liquid-absorbent fibers and a high-absorbent polymer; and a skin-side core wrap, which is arranged adjacent to the skin side of the absorbent core, the skin-side core wrap is composed of a base material layer and a fiber layer, the fiber layer is provided with thermoplastic resin fibers of 18 gsm or more, and the unopened absorbent articles The length of the absorbent article group in the storage body in the predetermined direction is less than 70% of the length of the absorbent article group in the predetermined direction after 96 hours have passed since the absorbent article storage body was unsealed and the absorbent article group was taken out, and the absorption rate in an absorption rate test of the absorbent articles after 5 minutes have passed since the absorbent article storage body was unsealed and the absorbent articles were taken out is more than 85% of the absorption rate in the absorption rate test of the absorbent articles after 96 hours have passed since the absorbent article storage body was unsealed and the absorbent articles were taken out.

[0029] In order to reduce the amount of packaging materials used and reduce logistics costs, it is desirable to make the absorbent article storage body compact. However, the more compact the absorbent article storage body is, the more the absorbent article is flattened or the more the absorbent core is deformed, making it more difficult to achieve the desired absorption function. According to the absorbent article storage body of mode 1, even when the absorbent articles are stacked and compressed, since the skin-side core wrap of the absorbent article is composed of a base material layer and a fiber layer having thermoplastic resin fibers of 18 gsm or more, the fiber layer is easier to compress than when the fiber layer of the skin-side core wrap has less than 18 gsm of thermoplastic resin fibers, thereby reducing the risk of the absorbent core being flattened. Furthermore, by setting the length in the predetermined direction of the absorbent article group in the unopened absorbent article storage body to be less than 70% of the length in the horizontal direction of the absorbent article group 96 hours after the absorbent article group was taken out, the absorbent article storage body in the packaged state can be made compact, compared with a case where the length in the predetermined direction of the absorbent article group in the unopened absorbent article storage body is longer than 70% of the length in the horizontal direction of the absorbent article group 96 hours after the absorbent article group was taken out. At the same time, even when the absorbent articles taken out from the absorbent article storage body in the compact state are worn, the absorption rate can be achieved that is more than 85% of the state in which the compression is relaxed 96 hours after the absorbent articles are taken out of the absorbent article storage body. Therefore, it is easy to strike a balance between the compactness of the absorbent article storage body and the maintenance of the absorbency of the absorbent articles.

[0030] (Method 2)

[0031] The absorbent article storage body according to aspect 1 is characterized in that the fiber layer is provided on the absorbent core side with respect to the base material layer.

[0032] According to the absorbent article storage body of method 2, the absorbent article taken out from the absorbent article storage body has the compression of the fiber layer eliminated and the intervals between the fibers expanded. Therefore, when worn, the capillary phenomenon is used to easily move the excrement to the absorbent core adjacent to the fiber layer, making it easy to keep the excrement away from the wearer's skin.

[0033] (Method 3)

[0034] The absorbent article storage body according to aspect 1 or 2, wherein the thermoplastic resin fibers of the fiber layer have portions intertwined with the liquid absorbent fibers of the absorbent core.

[0035] According to the absorbent article storage body of mode 3, since the fiber layer is more easily deformed than the absorbent core, deformation of the absorbent core can be reduced when the absorbent article is taken out of the absorbent article storage body. In addition, since excrement is easily transferred from the fiber layer to the absorbent core when the wearer is wearing the absorbent article, it is easy to keep the excrement away from the wearer's skin.

[0036] (Method 4)

[0037] The absorbent article storage body according to method 2 or 3 is characterized in that the absorbent article has a skin side sheet at a position closer to the skin side than the skin side core wrap portion, an adhesive is used to fix the skin side sheet to the base material layer, an adhesive is used to fix the base material layer to the fiber layer, and the unit area weight of the adhesive between the base material layer and the fiber layer is lower than the unit area weight of the adhesive between the skin side sheet and the base material layer.

[0038] According to the absorbent article storage body of method 4, compared with the case where the unit area weight of the adhesive between the skin side panel and the base layer is lower than the unit area weight of the adhesive between the base layer and the fiber layer, it is easy for excrement to move from the base layer to the fiber layer when worn, thereby making it easy to keep excrement away from the wearer's skin.

[0039] (Method 5)

[0040] The absorbent article storage body according to any one of aspects 1 to 4, wherein the base layer includes fibers having a hydrophilic function.

[0041] According to the absorbent article storage body of method 5, when the absorbent article is worn, excrement absorbed from the skin side of the absorbent article is moved from the skin side sheet to the base material layer, which makes it easy to reduce the risk of excrement already absorbed by the base material layer returning to the skin side sheet side, thereby making it easy to keep the excrement away from the wearer's skin.

[0042] (Method 6)

[0043] The absorbent article storage body according to any one of aspects 1 to 4, wherein the absorbent article has a skin side sheet at a position closer to the skin side than the skin side core pack, and the base material layer is tissue paper formed of hydrophilic fibers.

[0044] According to the absorbent article storage body of method 6, when the absorbent article is worn, excrement absorbed from the skin side of the absorbent article is moved from the skin side sheet to the base material layer, which makes it easy to reduce the risk of excrement already absorbed by the base material layer returning to the skin side sheet side, thereby making it easy to keep excrement away from the wearer's skin.

[0045] (Method 7)

[0046] The absorbent article storage body according to any one of aspects 1 to 5 is characterized in that the absorbent article has a skin side sheet at a position closer to the skin side than the skin side core wrap, and the base layer is a spunbond / meltblown / spunbond nonwoven fabric formed of hydrophilic fibers.

[0047] According to the absorbent article storage body of method 7, when the absorbent article is worn, excrement absorbed from the skin side of the absorbent article is moved from the skin side sheet to the base layer, which facilitates the movement of excrement from the base layer to the absorbent core, thereby facilitating the excrement to be kept away from the wearer's skin.

[0048] (Method 8)

[0049] The absorbent article storage body according to any one of aspects 1 to 6, wherein a basis weight of the thermoplastic resin fibers of the fiber layer is higher than a basis weight of fibers of the base material layer.

[0050] According to the absorbent article storage body of aspect 8, the fiber layer in a compressed state in the absorbent article storage body can be easily restored compared to a case where the basis weight of the thermoplastic resin fibers of the fiber layer is lower than the basis weight of the fibers of the base layer.

[0051] (Method 9)

[0052] The absorbent article storage body according to any one of methods 1 to 7 is characterized in that the absorbent article has a skin side sheet at a position closer to the skin side than the skin side core wrap, and the unit area weight of the thermoplastic resin fiber of the fiber layer is higher than the unit area weight of the fiber of the surface sheet.

[0053] According to the absorbent article storage body of method 9, compared with the case where the unit area weight of the thermoplastic resin fibers of the fiber layer is lower than the unit area weight of the fibers of the surface sheet, it is easy to restore the fiber layer of the absorbent article storage body from a compressed state, and it is easy to move excrement from the skin side sheet to the fiber layer, thereby making it easy to keep excrement away from the wearer's skin.

[0054] (Method 10)

[0055] The absorbent article storage body according to any one of aspects 1 to 8, wherein the absorbent article has an outer sheet at a position closest to the non-skin side, and the thermoplastic resin fibers of the fiber layer have a higher basis weight than fibers of the outer sheet.

[0056] According to the absorbent article storage body of aspect 10, the fiber layer in a compressed state in the absorbent article storage body can be easily restored compared to a case where the basis weight of the thermoplastic resin fiber of the fiber layer is lower than the basis weight of the fiber of the outer sheet.

[0057] (Method 11)

[0058] The absorbent article storage body according to any one of methods 1 to 9 is characterized in that the absorbent article has a skin side sheet at a position closer to the skin side than the skin side core wrap, and the average value of the thickness of the thermoplastic resin fiber of the fiber layer is greater than the average value of the thickness of the fiber of the skin side sheet.

[0059] According to the absorbent article storage body of aspect 11, the fiber layer of the absorbent article storage body can be easily restored from a compressed state compared to a case where the maximum value of the thickness of the thermoplastic resin fibers of the fiber layer is smaller than the maximum value of the thickness of the fibers of the skin side sheet.

[0060] (Method 12)

[0061] The absorbent article storage body according to any one of methods 1 to 10 is characterized in that the absorbent article has a non-skin side core wrap portion arranged adjacent to the non-skin side of the absorbent core, and the non-skin side core wrap portion is composed of the base material layer and the fiber layer.

[0062] According to the absorbent article storage body of method 12, even when the absorbent articles are stacked and compressed, the risk of the absorbent core being crushed can be further reduced by making the fiber layer of the skin-side core wrap and the fiber layer of the non-skin-side core wrap of the absorbent article easy to compress.

[0063] (Method 13)

[0064] The absorbent article storage body according to aspect 11 is characterized in that the fiber layer of the non-skin-side core wrap is provided closer to the absorbent core than the base material layer.

[0065] According to the absorbent article storage body of method 13, even when the absorbent articles are stacked and compressed, the risk of the absorbent core being crushed can be further reduced by making the fiber layer of the skin-side core wrap and the fiber layer of the non-skin-side core wrap of the absorbent article easy to compress.

[0066] (Method 14)

[0067] The absorbent article storage body according to any one of aspects 1 to 12 is characterized in that the absorbent article has a compressed portion formed by compressing at least the absorbent core and the skin-side core wrap at a position where the absorbent core and the skin-side core wrap overlap when viewed from the skin side.

[0068] According to the absorbent article storage body of method 14, since the compression part is the part where the fiber density is increased, it is easy to introduce excrement into the compression part by utilizing the capillary phenomenon, and the risk of local bulging of the fiber layer of the core wrap part on the skin side due to absorption of excrement when the absorbent article is worn can be reduced.

[0069] (Method 15)

[0070] The absorbent article storage body according to any one of methods 1 to 13 is characterized in that the absorbent article has a non-compressed portion where the absorbent core and the skin-side core wrap portion overlap when viewed from the skin side, and in the thickness direction of the absorbent article, the center of the length of the compressed portion from the skin side of the skin-side core wrap portion to the non-skin side of the absorbent core is located closer to the skin side than the center of the length of the non-compressed portion from the skin side of the skin-side core wrap portion to the non-skin side of the absorbent core.

[0071] According to the absorbent article storage body of method 15, by making the density of the liquid absorbent fibers of the absorbent core higher than the density of the fibers of the fiber layer in the compression portion, the capillary phenomenon is utilized to facilitate the movement of excrement from the fiber layer toward the absorbent core. While facilitating the excrement to be away from the wearer's skin, the risk of the excrement staying in the compression portion can be reduced, thereby reducing the risk of delayed absorption of the excrement.

[0072] (Method 16)

[0073] The absorbent article storage body according to method 13 or 14 is characterized in that the absorbent article has a low-density portion in which the density of the liquid-absorbing fibers of the absorbent core is lower and the density of the fibers of the fiber layer is lower than that of the compressed portion at the position where the absorbent core and the skin-side core wrap overlap when viewed from the skin side, and the compressed portion has a portion adjacent to the low-density portion in the length direction or left-right direction of the absorbent article.

[0074] According to the absorbent article storage body of method 16, when the absorbent article is worn, the compressed portion with a higher fiber density can easily absorb liquid by utilizing the capillary phenomenon, and the excreted excrement can be easily moved from the wearer's skin toward the absorbent core. At the same time, by moving the excrement already absorbed by the compressed portion to the adjacent low-density portion in the length direction or the left-right direction, the decrease in the absorption capacity of the compressed portion is reduced, and the excrement can be easily moved away from the wearer's skin.

[0075] (Method 17)

[0076] The absorbent article storage body according to any one of methods 1 to 15 is characterized in that a value obtained by dividing the thickness of the fiber layer after 96 hours from the time the absorbent article storage body is unsealed and the absorbent article is taken out by the thickness of the fiber layer when the absorbent article is unsealed and the absorbent article is taken out is less than a value obtained by dividing the thickness of the absorbent core after 96 hours from the time the absorbent article storage body is unsealed and the absorbent article is taken out by the thickness of the absorbent core when the absorbent article storage body is unsealed and the absorbent article is taken out.

[0077] According to the absorbent article storage body of mode 17, the fiber layer is easier to compress and recover than the absorbent core, thereby making the absorbent article storage body compact while reducing the risk of excessive squashing of the absorbent core, thereby reducing the risk of reduced absorbency of the absorbent article.

[0078] (Method 18)

[0079] The absorbent article storage body according to any one of aspects 1 to 16, wherein the fiber layer is composed of fibers containing PET fibers.

[0080] According to the absorbent article storage body of aspect 18, since the PET fiber has a high rigidity, the thickness of the fiber layer is easily restored after the self-compression is released compared to the case where the PET fiber is not contained.

[0081] (Method 19)

[0082] The absorbent article storage body according to any one of aspects 1 to 17, wherein at least part of the fibers in the fiber layer have a hydrophilic function.

[0083] According to the absorbent article storage body of aspect 19, the fiber layer including the hydrophilic fibers can easily absorb excrement, and the excrement can be easily kept away from the wearer's skin, thereby making it difficult for the excrement to remain on the surface of the absorbent article.

[0084] (Method 20)

[0085] An absorbent article, comprising: an absorbent core, which has at least liquid-absorbing fibers and a superabsorbent polymer; and a skin-side core wrap, which is arranged adjacent to the skin side of the absorbent core, characterized in that the skin-side core wrap is composed of a substrate layer and a fiber layer, the unit area weight of the thermoplastic resin fibers of the fiber layer is higher than the unit area weight of the fibers of the substrate layer, and the fiber layer is arranged at a position closer to the absorbent core than the substrate layer.

[0086] According to the absorbent article of method 20, even when force is applied in the thickness direction of the absorbent article, the fiber layer of the core wrap on the skin side of the absorbent article is easily compressed compared to the absorbent core, and the risk of decreased absorbency of the absorbent article due to deformation of the absorbent core can be reduced.

[0087] ===Present Implementation Method===

[0088] <<Basic structure of storage body 100>>

[0089] Hereinafter, as an example of the absorbent article storage body of the present embodiment, a storage body 100 (also referred to as "storage body 100") of a pant-type disposable diaper 1 for adults will be cited as an example for explanation. However, the disposable diaper of the present embodiment is not limited to the above-mentioned diapers, and may also be a pant-type disposable diaper for infants, a belt-type disposable diaper for infants or adults, a physiological shorts, a sanitary napkin, a light incontinence pad, an absorbent pad, a disposable diaper for animals, an absorbent sheet, etc.

[0090] Figure 1 1 is a perspective view of a storage body 100. The storage body 100 includes a plurality of underpants-type disposable diapers 1 (hereinafter also referred to as "diapers 1" for short). Figure 2The diaper 1 is circulated and stored in the state of being stored in the storage body 100 of the storage member 120. Figure 1 As shown, in the present embodiment, the storage body 100 in the state where a plurality of diapers 1 are stored in the storage part 120 (hereinafter also referred to as the "storage state") is a roughly hexahedron having a plurality of surfaces 200 (front surface 200A, side surface 200B, rear surface (not shown), upper surface 200D, bottom surface (not shown)), but is not limited to this and may also be other polyhedrons, etc.

[0091] <Basic structure of diaper 1>

[0092] Figure 2 It is a schematic perspective view of the diaper 1. Figure 3 It is a top view of the diaper 1 in the unfolded and stretched state. Figure 4 It is along Figure 3 The schematic cross-sectional view of the AA line of the diaper 1. The "expanded state" of the diaper 1 refers to a state in which the pair of side joints 50, 50 provided on both sides of the diaper 1 are separated and the diaper 1 is opened and unfolded in a plane. The "stretched state" of the diaper 1 refers to a state in which the diaper 1 as a whole (the whole product) is stretched to a state without wrinkles, and specifically refers to a state in which the size of each component constituting the diaper 1 (for example, the absorbent body 10 and the waist member 20 described later) is consistent with or close to the size of the component alone.

[0093] Diapers 1 in Figure 2 The panty-shaped state shown has mutually intersecting up-down, left-right, and front-back directions, and has a waist opening BH and a pair of leg openings LH, LH. The upper side in the up-down direction corresponds to the waist opening BH side, and the lower side in the up-down direction corresponds to the crotch side. In addition, the front side in the front-back direction corresponds to the wearer's abdomen, and the rear side in the front-back direction corresponds to the wearer's back. Figure 3 In the unfolded state, the diaper 1 has a longitudinal direction and a transverse direction that intersect each other. The longitudinal direction is along Figure 2 The up-down direction in the absorbent body 10 corresponds to the length direction of the absorbent body 10. The transverse direction is along Figure 2 In the left and right directions. In addition, Figure 4 As shown, the direction in which the materials constituting the diaper 1 are stacked is the thickness direction. The side in contact with the wearer's skin in the thickness direction is the skin side, and the opposite side is the non-skin side. The front-back direction of the underpants-type state is along the thickness direction of the waist member 20. Figure 2 The center line CC shown in FIG. 1 indicates the center of the diaper 1 in the transverse direction, and the center CL indicates the center of the diaper 1 in the longitudinal direction.

[0094] The diaper 1 has a liquid-absorbent main body 10 and a waist member 20 disposed on the non-skin side of the absorbent main body 10. The waist member 20 has a front waist portion 30 covering the wearer's abdominal portion and a rear waist portion 40 covering the wearer's back portion. The diaper 1 is a so-called three-piece pant-type diaper.

[0095] exist Figure 3 In the unfolded state shown, the absorbent body 10 is erected between the front waistline portion 30 and the rear waistline portion 40, while the ends 10ea, 10eb of the absorbent body 10 in the longitudinal direction (longitudinal direction) are respectively joined and fixed to the skin side of the waistline portions 30, 40 closest to each other, and its appearance is roughly H-shaped when viewed from above. In addition, from this state, the absorbent body 10 is folded in half with the central position CL in the longitudinal direction as the folding position (folding line), and the side portions 30sw on both sides of the left and right directions of the front waistline portion 30 and the side portions 40sw on both sides of the left and right directions of the rear waistline portion 40 that are opposite to each other are joined and connected to each other, thereby forming a pair of side joints 50, 50. The side joints 50 are formed by known joining means such as welding and bonding. As a result, the front waistline portion 30 and the rear waistline portion 40 are formed into a ring shape, becoming Figure 2 The diaper 1 shown is in a pull-on type with a waist opening BH and a pair of leg openings LH, LH formed therein.

[0096] (Absorbent body 10)

[0097] Figure 5A is a top view of the absorbent body 10, Figure 5B 1 is a schematic cross-sectional view of an absorbent body 10. The absorbent body 10 includes an absorbent body 11 for absorbing excrement, a top sheet (skin side sheet) 12 disposed on the skin side in the thickness direction relative to the absorbent body 11, a back sheet 13 disposed on the non-skin side relative to the absorbent body 11, and an outer sheet 14. However, the absorbent body 10 may also include sheet members other than these. For example, a second sheet (not shown) may be provided between the top sheet 12 and the absorbent body 11 in the thickness direction.

[0098] The absorber 11 includes an absorbent core 11a and a core wrap sheet 11b. The absorbent core 11a is a member that absorbs and retains excretion fluid such as urine. The core wrap sheet 11b is a sheet member that covers the outer peripheral surface of the absorbent core 11a.

[0099] The absorbent core 11a of this embodiment includes liquid absorbent fibers af such as pulp fibers and super absorbent polymer (SAP) as (see Figure 7 ). In addition, the absorbent core 11a has a narrowed portion 11c whose width in the left-right direction is narrowed between the front side end and the rear side end in the longitudinal direction, and has Figure 5A The narrowed portion 11c is a portion sandwiched between the legs of the wearer when the diaper 1 is worn. The narrowed portion 11c is provided so that the absorbent core 11a can be easily attached to the crotch of the wearer. In addition, the shape of the absorbent core 11a is not limited to this shape.

[0100] like Figure 5B As shown, the core wrap sheet 11b of the absorbent body 11 of the present embodiment includes a skin-side core wrap portion 11ba and a non-skin-side core wrap portion 11bb. The skin-side core wrap portion 11ba is a sheet disposed adjacent to the skin side of the absorbent core 11a, and covers substantially the entire area of ​​the skin side of the absorbent core 11a from the skin side. The non-skin-side core wrap portion 11bb is a sheet disposed adjacent to the non-skin side of the absorbent core, and folds back both sides in the left and right directions toward the skin side in a manner that covers substantially the entire area of ​​the non-skin side of the absorbent core 11a from the non-skin side and rolls up the absorbent core 11a. The skin-side core wrap portion 11ba will be described later. As the non-skin-side core wrap portion 11bb, a liquid-permeable sheet member such as tissue paper and nonwoven fabric can be exemplified.

[0101] The top sheet 12 is a liquid-permeable sheet, and for example, a hydrophilic air-through nonwoven fabric, a spunbonded nonwoven fabric, etc. can be used. Figure 5B In this way, the substantially entire area of ​​the skin side of the absorbent body 11 is covered. In the present embodiment, the top sheet 12 is provided only on the skin side of the absorbent body 11, but it is not limited thereto. For example, the top sheet 12 may be folded back to the non-skin side in the left-right direction in a manner that the absorbent body 11 is rolled in.

[0102] The back sheet 13 is a liquid-impermeable sheet, and for example, a resin film etc. can be used. The back sheet 13 is provided on the non-skin side of the absorbent body 11 .

[0103] The outer sheet 14 is provided at the non-skin side of the absorbent body 10 and in this embodiment forms a leakage-proof wall 15 at the end in the lateral direction of the absorbent body 10. As the outer sheet 14, for example, a soft and hydrophobic nonwoven fabric can be used.

[0104] A pair of anti-leakage walls 15 are provided along the longitudinal direction (the length direction of the absorbent body 10) on both sides of the absorbent body 10 in the left-right direction. Specifically, in the left-right direction (lateral direction), a portion of the outer sheet 14 extends outward from both ends of the absorbent body 11 and is formed like a Figure 5BThe diaper 1 is bent toward the skin side at multiple locations to form a pair of leakage-proof wall portions 15. The leakage-proof wall elastic member 16 such as an elastic thread is attached to the skin-side end portion (front end portion) of the leakage-proof wall portion 15 in a state of being stretched in the longitudinal direction. When the diaper 1 is worn, the leakage-proof wall portion 15 stands up toward the skin side of the wearer due to the elasticity of the leakage-proof wall elastic member 16, thereby fitting against the crotch portion of the wearer.

[0105] In addition, the leg elastic members 17 such as elastic threads are attached to both sides of the absorbent body 10 in a stretched state along the longitudinal direction (the length direction of the absorbent body 10). When the diaper 1 is worn, the two sides of the absorbent body 10 contract due to the elasticity of the leg elastic members 17, so that it is easy to fit along the legs of the wearer.

[0106] (Front waistline 30)

[0107] like Figure 4 As shown, the front waistline portion 30 has a skin side piece 31 arranged at the position closest to the skin in the thickness direction, a non-skin side piece 32 arranged on the non-skin side of the skin side piece 31, and a waist elastic component 35 arranged between the skin side piece 31 and the non-skin side piece 32.

[0108] The skin side sheet 31 and the non-skin side sheet 32 ​​are as follows Figure 3 The rectangular sheet members shown in plan view are formed of, for example, SMS nonwoven fabrics, etc. In order to improve the air permeability of the front waistline portion 30, at least one of the skin side sheet 31 and the non-skin side sheet 32 ​​may have through holes (not shown) penetrating in the thickness direction.

[0109] The front waistline portion 30 of this embodiment has a folded portion 32f formed by folding the upper end portion (front end portion in the longitudinal direction) of the non-skin side sheet 32 ​​from the non-skin side to the skin side and from the front side to the rear side in the longitudinal direction. By covering a part (upper end portion) of the skin side sheet 31 with the folded portion 32f, the upper edge of the skin side sheet 31 is prevented from getting stuck in the wearer's skin. However, the folded portion 32f may not necessarily be provided.

[0110] The front waistline portion 30 is basically a two-layer structure of a skin side sheet 31 and a non-skin side sheet 32, but for example, a skin side sheet 36 or the like (see Figure 4 The skin sheet 36 is a sheet member configured to cover the upper end (front end in the longitudinal direction) of the absorbent body 10 from the skin side, and has a function as a cover sheet. This prevents the upper edge of the absorbent body 10 from getting caught in the wearer's skin when the diaper 1 is worn. The skin sheet 36 is formed, for example, of SMS nonwoven fabric.

[0111] A plurality of waist elastic members 35 are arranged vertically between the skin side sheet 31 and the non-skin side sheet 32 ​​and are attached in a stretched horizontal state. The elasticity of the waist elastic members 35 allows the front waist portion 30 to fit the wearer's abdominal waist.

[0112] The waist elastic member 35 can be attached using an adhesive such as a hot melt adhesive. For example, the waist elastic member 35 can be attached by applying a hot melt adhesive to the waist elastic member 35 and stretching it at a predetermined stretching ratio and sandwiching it between the skin side sheet 31 and the non-skin side sheet 32. In addition, the means for attaching the waist elastic member 35 to the front waist portion 30 is not limited to an adhesive, and a welded portion may also be used.

[0113] (Rear waistline 40)

[0114] The back waistline portion 40 includes a skin side sheet 41 disposed at the position closest to the skin side in the thickness direction, a non-skin side sheet 42 stacked adjacent to the non-skin side of the skin side sheet 41, and a waist elastic member 45 provided between the skin side sheet 41 and the non-skin side sheet 42. In addition, it may also include a folded portion 42f, a skin top sheet 46, etc., similarly to the front waistline portion 30 (see Figure 3 , Figure 4 ). In addition, it may also have a through hole (not shown) that penetrates in the thickness direction. Since the structure of each component is substantially the same as that of the front waistline portion 30, the description thereof is omitted.

[0115] On the other hand, the appearance of the rear waistline portion 40 is different from that of the front waistline portion 30. Specifically, the rear waistline portion 40 is like Figure 3 Thus, the buttocks cover 40b is provided, which is substantially trapezoidal in shape at the lower side of the side joint 50 (side portion 40sw). The buttocks cover 40b is a portion whose width in the left-right direction becomes narrower as it goes from the upper side to the lower side in the vertical direction, and whose outer edge is curved. By providing the buttocks cover 40b, the rear waistline portion 40 can cover the buttocks of the wearer in a wide range when the diaper 1 is worn. However, the buttocks cover 40b may not necessarily be provided.

[0116] In addition, the hip cover 40b is provided with Figure 3 The bent elastic member 47 such as an elastic band is shown. The bent elastic member 47 is installed between the skin side sheet 41 and the non-skin side sheet 42 in a state of being stretched along the end edge of the hip cover 40b. The hip cover 40b of the rear waistline portion 40 is easily fitted to the wearer's hips when the diaper 1 is worn, and is not easily rolled up from the hips, by utilizing the elasticity of the bent elastic member 47.

[0117] <<Storage unit 120>>

[0118] The storage part 120 is formed of a resin (plastic) film, specifically, a resin film made of polyethylene (PE). In addition, the material constituting the storage part 120 is not limited thereto, and can also be formed using a film-like raw material such as a synthetic resin film made of ethylene-vinyl alcohol copolymer (EVOH), polypropylene (PP), and polyethylene terephthalate (PET).

[0119] The storage part 120 has a handle area 121 at the upper part of the upper surface 200D. The handle area 121 is formed by extending the material (surface) of the storage part 120. Specifically, the upper surface 200D is formed by fitting the portions extending from the side surfaces 200B on both sides together, and the handle area 121 is formed by fitting the portions extending from the front surface 200A and the back surface together. A handle portion 122 for inserting a hand is provided at the upper end of the handle area 121. The handle portion 122 is a through portion provided in the handle area 121. By having the handle portion 122, it is easy for the wearer or a person who is to put the diaper 1 on the wearer (hereinafter also referred to as "the wearer, etc.") to carry the storage body 100.

[0120] The storage member 120 of the present embodiment has an easy tear line P as an opening member for forming an opening. The easy tear line P provided in the storage member 120 of the present embodiment is provided on the upper surface 200D of the storage body 100. The easy tear line P is a through hole that penetrates the storage member 120 in the thickness direction and is provided in a straight line and intermittently along the left-right direction. Since the storage member 120 has the easy tear line P, the wearer or the like can easily form an opening by tearing the storage member 120 using the easy tear line P, and thus the diaper 1 can be taken out from the inside of the storage member 120 through the opening by a simple operation.

[0121] <<Storage body 100 in storage state>>

[0122] Figure 6 This is a diagram of the storage body 100 viewed from the front surface. Figure 1 As shown in the figure, the storage body 100 in the storage state has an up-down direction, a left-right direction, and a front-back direction. In the case where the storage body 100 (storage piece 120) has a handle portion 122, the up-down direction is determined by setting the side of the storage body 100 with the handle portion 122 in the up-down direction as the upper side and the opposite side as the lower side. Alternatively, when the handle portion 122 is not provided, the surface 200 of the storage body 100 (storage piece 120) on which the largest product name is recorded is set as the front surface 200A, and the up-down direction is determined by the direction of the text of the product name on the front surface 200A.

[0123] In the storage body 100, a plurality of diapers 1 are stored as a diaper set R stacked in a predetermined direction. Specifically, the stored diapers 1 are in a panty-type state ( Figure 2 ) are arranged adjacent to each other in the front-to-back direction (thickness direction) of the diaper 1. The folded position (folding line) of the stored diapers 1 is set at the bottom, and the diapers 1 (diaper set R) are stored inside the storage unit 120 in a stacked state in a predetermined direction (front-to-back direction) of the diapers 1. In this embodiment, as Figure 1 As shown in FIG. 1 and FIG. 2 , the front-to-back direction (predetermined direction) of the diaper 1 is along the left-right direction of the storage body 100. Figure 1 and Figure 6 As shown, one diaper set R is stored in the storage body 100 of the present embodiment. The diaper set R is a plurality of (20) diapers 1 stacked in the left-right direction of the storage body 100 (the front-back direction of the diapers 1 ).

[0124] The diaper set R may be all the diapers 1 stacked in the stacking direction of the diapers 1 in the storage body 100, or may be a part (a plurality) of the diapers 1 stacked in the stacking direction of the diapers 1 in the storage body 100. In the storage body 100 of the present embodiment, 20 diapers 1 are stacked in the left-right direction of the storage body 100, and the 20 diapers 1 are collectively referred to as the "diaper set R", but, for example, four diapers 1 adjacent to each other in the left-right direction of the storage body 100 among the 20 diapers 1 stacked in the stacking direction (the left-right direction of the storage body 100) may be referred to as the "diaper set R". In addition, a plurality of diaper sets R may be arranged in a direction (the up-down direction or the front-back direction of the storage body 100) orthogonal to the stacking direction (the left-right direction of the storage body 100). For example, the storage body may include a plurality of diaper groups, wherein an "upper diaper group" (not shown) is arranged on the upper side in the up-down direction of the storage body, in which 10 diapers 1 are stacked in the left-right direction of the storage body, and a "lower diaper group" (not shown) is arranged on the lower side, in which 10 diapers 1 are stacked in the left-right direction of the storage body.

[0125] The diaper set R of this embodiment arranges all the diapers 1 such that the front-to-back direction of the diapers 1 is along the left-to-right direction of the storage body 100 and the folding position (folding line) is at the bottom, but the present invention is not limited thereto. For example, the diaper set R may arrange all the diapers 1 such that the front-to-back direction of the diapers 1 is along the front-to-back direction of the storage body 100, or arrange some of the diapers 1 in the diaper set R such that the front-to-back direction is along the front-to-back direction of the storage body 100 and the front-to-back direction of the other diapers 1 is along the left-to-right direction of the storage body 100. In addition, all the diapers 1 in the diaper set R may be arranged such that the folding position is at the top, or arrange some of the diapers 1 in the diaper set R such that the folding position is at the top and the folding position of the other diapers 1 is at the bottom.

[0126] <<About diapers in the stored and restored states 1>>

[0127] Generally, absorbent articles such as disposable diapers are stored in an absorbent article storage body of a storage unit (see Figure 1 ) for circulation and sales. The absorbent article storage body is usually circulated by means of transportation such as trucks, but the larger the size of the storage body, the greater the transportation volume, the greater the emission of waste gas such as carbon dioxide, and the greater the burden on the environment. In addition, the larger the size of the storage body, the greater the transportation volume and the greater the transportation cost, or the larger the display space required for sales. Therefore, it is desirable to make the absorbent article storage body compact (miniaturized).

[0128] As a method of making the absorbent article storage body compact (miniaturized), there is a known method of compressing and storing the absorbent articles. Generally, in absorbent articles such as disposable diapers, the absorbent core (absorbent body) is thick and has high rigidity. In order to make the absorbent article storage body compact, the greater the degree of compression of the absorbent article in a predetermined direction, the easier it is for the absorbent core to be flattened and deformed. As a result, there is a problem that even if the absorbent article storage body becomes compact, the absorbent article taken out of the absorbent article storage body will cause the absorbency of excrement to decrease or excrement to leak due to the flattening and deformation of the absorbent core when it is worn.

[0129] The storage body 100 of this embodiment compresses a plurality of diapers 1 in the left-right direction of the storage body 100 (the front-back direction or the thickness direction of the diapers 1), thereby making the storage body 100 compact (miniaturized) compared to a non-compressed case. The compression direction for the diapers 1 and the stacking direction of the diaper set R are along the left-right direction of the storage body 100.

[0130] When the compressed diaper 1 in the storage state is taken out from the storage body 100 and released from the compressed state and a certain time has passed, the thickness of the diaper 1 in the front-back direction (thickness direction) increases and approaches the thickness of the diaper 1 before being stored in the storage body 100 (before compression). The state in which the thickness of the diaper 1 taken out from the storage body 100 increases is called a "recovered state". The "recovered state" in this embodiment refers to the state after the unopened storage body 100 is opened and a plurality of diapers 1 are taken out and left to stand for 96 hours in an environment at room temperature of 20°C and humidity of 60%. In addition, in the technical scheme of this case, "the state after 5 minutes" and "the state after 96 hours" respectively refer to "the state after the diaper 1 is taken out from the storage body 100 and left in an environment at room temperature of 20°C and humidity of 60% for 5 minutes" and "the state after the diaper 1 is taken out from the storage body 100 and left in an environment at room temperature of 20°C and humidity of 60% for 96 hours".

[0131] As described above, the diaper 1 stored in the storage body 100 of the present embodiment is compressed in the thickness direction (the front-rear direction of the diaper 1 ). Figure 7 A is a diagram showing the diaper set R in a stored state as viewed from the front. Figure 7 B is a view of the diaper set R in the restored state as viewed from the front surface. The length of the diaper set R in the stacking direction (compression direction for the diapers 1, left-right direction of the storage body 100) in the stored state is LRp, and the length of one diaper 1 in the thickness direction is L1p ( Figure 6 , Figure 7 A). When all the diapers 1 of the diaper set R are taken out from the storage body 100 and released from the compressed state, all the diapers 1 become diapers 1 in the restored state ( Figure 7 B). The length of the diaper set R in the restored state in the left-right direction is LRr, and the length of one diaper 1 in the thickness direction is L1r. That is, the length LRr of the diaper set R in the restored state in the stacking direction is longer than the length LRp of the diaper set R in the stored state in the stacking direction (LRp<LRr), and the length L1r of the diaper 1 in the restored state in the thickness direction is longer than the length L1p of the diaper 1 in the stored state in the thickness direction (L1p<L1r).

[0132] In addition, along with the compression and recovery of the diaper 1, as Figure 8 As shown, regarding the length of the absorbent body 11 in the thickness direction, the length T11r of the absorbent body in the restored state in the thickness direction is longer than the length T11p of the absorbent body 11 in the stored state in the thickness direction (T11p<T11r). Figure 8 A is an enlarged schematic diagram of the absorbent body 11 in a compressed state. Figure 8 B is an enlarged schematic diagram of the absorbent body 11 in a restored state.

[0133] In the storage body 100 of the present embodiment, a plurality of diapers 1 are stored in a compressed state in the storage member 120 as a diaper set R stacked in the left-right direction (predetermined direction). Even when the diapers 1 are stored in a compressed state, the risk of the absorbent core 11a being crushed can be reduced. In addition, while the storage body 100 is made compact by the compression of the diapers 1, when the diapers 1 are taken out of the storage body 100, the absorbency is 85% or more of the absorption rate of the state after 96 hours since the diapers 1 were taken out of the storage body 100. Therefore, it is easy to achieve both the compactness of the storage body 100 and the maintenance of the absorbency of the diapers 1.

[0134] The diaper 1 includes an absorbent core 11a including at least liquid-absorbent fibers (such as pulp fibers) and a superabsorbent polymer (SAP), and a skin-side core wrap 11ba provided adjacent to the skin-side surface of the absorbent core 11a.

[0135] like Figure 5B and Figure 8 As shown, the skin-side core pack 11ba is composed of a base material layer bb and a fiber layer bf. The fiber layer bf is a layer of fibers having a thermoplastic resin fiber weight of 18 gsm or more. In this embodiment, in the skin-side core pack 11ba, the base material layer bb and the fiber layer bf are bonded by an adhesive such as a hot melt adhesive.

[0136] In addition, the length LRp of the diaper set R in the unopened storage body 100 in the predetermined direction (see Figure 7 A) is the length LRr of the diaper set R in the predetermined direction after 96 hours have passed since the storage body 100 was opened and the diaper set R was taken out (see Figure 7 B) is less than 70% (LRp≤LRr×70%), and the absorption rate of the diaper 1 in the absorption rate test 5 minutes after the storage body 100 is opened and the diaper 1 is taken out is more than 85% of the absorption rate of the diaper 1 in the absorption rate test 96 hours after the storage body 100 is opened and the diaper 1 is taken out.

[0137] Since the thermoplastic resin fiber of the fiber layer bf provided in the skin-side core wrap 11ba is 18 gsm or more, compared with the case where the thermoplastic resin fiber provided in the fiber layer bf is less than 18 gsm, when the diaper 1 is compressed in the stacking direction, the thickness of the fiber layer bf is easily changed compared with the absorbent core 11a.

[0138] like Figure 8 As shown in FIG. 1A , the absorbent body 11 of the stored diaper 1 is compressed and a force is applied in the thickness direction. Therefore, the length T11p of the absorbent body 11 in the stored state in the thickness direction is shorter than the length (not shown) of the absorbent body 11 in the thickness direction of the diaper 1 before the diaper 1 is stored in the storage body 100. In addition, the length T11p of the absorbent body 11 in the stored state in the thickness direction is shorter than the length T11r of the absorbent body 11 in the restored state.

[0139] The absorbent body 11 in the stored state ( Figure 8 A) thickness and the absorbent body 11 in the recovered state ( Figure 8B). Although there is a difference in length of error between the length Tap of the absorbent core 11a in the stored state and the length Tar of the absorbent core 11a in the restored state, the degree of length change is small. On the other hand, the length Tfp of the fiber layer bf in the stored state is shorter than the length Tfr of the absorbent core 11a in the restored state (Lfp<Tfr). In this way, when a force is applied to the diaper 1 in the stacking direction in the stored state, the fiber layer bf of the skin-side core bag 11ba is easily flattened and deformed compared with the absorbent core 11a.

[0140] Even when the diaper 1 is compressed in the stacking direction in order to make the storage body 100 compact, in the absorbent body 11 of the diaper 1, the fiber layer bf is easier to be flattened or deformed than the absorbent core 11a. Therefore, the risk of the absorbent core 11a being flattened or deformed can be reduced. As a result, the flattening and deformation of the absorbent core 11a in the wearing state of the diaper 1 by the wearer after the diaper 1 is taken out of the storage body 100 can be reduced, thereby reducing the risk of excrement not being properly absorbed by the absorbent core 11a in the wearing state and leaking out of the diaper 1, or causing discomfort to the wearer due to deformation of the absorbent core 11a with high rigidity. In addition, by using thermoplastic resin fibers for the fiber layer bf, due to the elasticity of the fibers, even if the fiber layer bf has shrunk in the thickness direction to become a storage state ( Figure 8 A), its thickness is also easy to recover in the recovery state ( Figure 8 B).

[0141] In addition, by making the length LRp of the diaper set R in the unopened storage body 100 in the predetermined direction less than 70% of the length of the diaper set R in the predetermined direction 96 hours after the storage body 100 is unsealed and the diaper set R is taken out, the storage body 100 in the packaged state can be made compact compared to the case where the length LRp of the diaper set R in the unopened storage body 100 in the predetermined direction is longer than 70% of the length of the diaper set R in the predetermined direction 96 hours after the storage body 100 is unsealed and the diaper set R is taken out.

[0142] Furthermore, by making the absorption rate of the diaper 1 in the absorption rate test 5 minutes after the storage body 100 is opened and the diaper 1 is taken out be at least 85% of the absorption rate of the diaper 1 in the absorption rate test 96 hours after the storage body 100 is opened and the diaper 1 is taken out, even the diaper 1 taken out from the storage body 100 in a compact state can have an absorption capacity of at least 85% of the absorption rate in the state where the compression is relaxed 96 hours after the diaper 1 is taken out of the storage body 100.

[0143] In addition, "the state of the diaper 1 after 96 hours have passed since the storage body 100 was taken out" refers to a state in which the thickness has recovered to a state substantially the same as the state immediately after the diaper 1 was manufactured before the diaper 1 was placed in the storage state, or the state in which the compression in the storage state has completely recovered. In other words, although the diaper 1 and the diaper set R are flattened and compressed in the thickness direction in the storage state, if 96 hours have passed since the storage body 100 was opened and the diaper 1 and the diaper set R were taken out, the compression is relieved and the influence caused by the compression is almost eliminated. In addition, "the state of the diaper 1 after 5 minutes have passed since the storage body 100 was taken out" is equivalent to the state in which the diaper 1 is taken out from the storage body 100 and put on the wearer to be in the wearing state.

[0144] That is to say, even if the length LRp in the predetermined direction of the diaper set R in the stored state is compressed to less than 70% of the length LRp in the predetermined direction, the diaper 1 has an absorbent core 11a having liquid-absorbent fibers and superabsorbent polymers (SAP) and a skin-side core wrap 11ba composed of a fiber layer bf having thermoplastic resin fibers of 18 gsm or more and a base material layer bb, and the absorption rate of the diaper 1 in an absorption rate test 5 minutes after the storage body 100 is opened and the diaper 1 is taken out is more than 85% of the absorption rate of the diaper 1 in an absorption rate test 96 hours later. Therefore, after the wearer takes out the diaper 1 from the storage body 100 and the wearer wears the diaper 1, 5 minutes later, the diaper 1 can absorb excrement at an absorption rate of more than 85% of the state in which the influence of compression almost disappears. Furthermore, even if the diaper 1 is compressed, the diaper 1 has an absorbency close to that of the uncompressed state when it is worn, compared to a case where the absorption rate of the diaper 1 in the absorption rate test after 5 minutes from the opening of the storage body 100 and the taking out of the diaper 1 is less than 85% of the absorption rate of the diaper 1 in the absorption rate test after 96 hours. Therefore, the risk of excrement leakage from the diaper 1 in the worn state can be reduced.

[0145] According to the above configuration, the storage body 100 can easily achieve both compactness of the storage body 100 and maintenance of the absorbency of the diaper 1 .

[0146] <Absorption rate test>

[0147] The "absorption rate test" can be performed by the following method using artificial urine.

[0148] As measuring devices, for example, artificial urine, a burette and a funnel (the burette was adjusted to a dropping rate of 10 ml / sec), a burette holder, a cylinder (60 mm in diameter, 550 g), a stopwatch, etc. were used.

[0149] The artificial urine is prepared by mixing (I) 200 g of urea, (II) 80 g of sodium chloride (salt), (III) 8 g of magnesium sulfate, (IV) 3 g of calcium chloride, and (V) about 1 g of pigment: blue No. 1 in 10 liters of ion exchange water.

[0150] Sample A and Sample B were used as samples for evaluation.

[0151] Sample A (Samples A1, A2, and A3) is a diaper after 5 minutes have passed since the storage body was opened and the diaper was taken out.

[0152] Sample B (samples B1, B2, and B3) is a diaper after 96 hours have passed since the storage body was opened and the diaper was taken out.

[0153] Although the time from taking out the diaper from the storage body to testing is different between Sample A and Sample B, Sample A1 and Sample B1, Sample A2 and Sample B2, and Sample A3 and Sample B3 are diapers of the same structure.

[0154] The disposable diapers of each sample A and sample B are respectively constituted by the same components as the above-mentioned diaper 1, but the amount of thermoplastic resin fiber in the fiber layer bf of the skin-side core pack 11ba of samples A1, B1, samples A2, B2 and samples A3, B3 is different.

[0155] The skin-side core pack 11 ba of Sample A1 and Sample B1 includes 10 gsm of fiber as the base material layer bb, 2 gsm of hot-melt adhesive, and 13 gsm of thermoplastic resin fiber as the fiber layer bf.

[0156] The skin-side core pack 11 ba of Samples A2 and B2 includes 10 gsm of fiber as the base material layer bb, 2 gsm of hot-melt adhesive, and 15 gsm of thermoplastic resin fiber as the fiber layer bf.

[0157] The skin-side core pack 11 ba of Samples A3 and B3 includes 10 gsm of fiber as the base material layer bb, 2 gsm of hot-melt adhesive, and 18 gsm of thermoplastic resin fiber as the fiber layer bf.

[0158] In addition, the diaper 1 of this embodiment corresponds to the sample A3 and the sample B3.

[0159] The actual measurement is performed in the following steps.

[0160] (1) Each sample is placed in an unfolded state (a state in which the side joints 50, 50 are separated, the diaper is opened and flatly unfolded).

[0161] (2) Use a marker to mark the location where the artificial urine was dropped for each sample.

[0162] The artificial urine dropping position was set to be the center in the longitudinal direction and the center in the left-right direction of each sample in the unfolded and stretched state.

[0163] (3) Fix the burette at a position 10 mm above the dropping position.

[0164] (4) Place the burette at the dripping position (center of the cylinder) and drip 100 ml of artificial urine. Simultaneously with the dripping, start measuring the absorption rate using a stopwatch.

[0165] (5) When the artificial urine in the cylinder is completely absorbed and disappears from the surface, the stopwatch is stopped to obtain the time required for each sample to absorb 100 ml of artificial urine.

[0166] Then, the absorption rate of each sample can be obtained by dividing the absorbed artificial urine (100 ml) by the time required for absorption (amount of artificial urine absorbed / time required for absorption).

[0167] Fig. 9 It is a graph showing the results of the absorption rate test.

[0168] Fig. 9 A shows the time [seconds] required for diapers A1, A2, and A3 to absorb 100 ml of artificial urine 5 minutes after the storage body was opened and the diapers were taken out, and the absorption rate [ml / s] calculated from the amount of artificial urine (100 ml) and the time required for absorption.

[0169] Fig. 9 B shows the time [seconds] required for diaper samples B1, B2, and B3 to absorb 100 ml of artificial urine after 96 hours from the time the storage body was opened and the diapers were taken out, and the absorption rate [ml / s] calculated from the amount of artificial urine (100 ml) and the time required for absorption.

[0170] Fig. 9 C shows the speed ratios [%] of samples A1 and B1, samples A2 and B2, and samples A3 and B3, specifically, it shows the value obtained by dividing the absorption speed of sample A1 by the absorption speed of sample B1 (absorption speed of A1 / absorption speed of B1), the value obtained by dividing the absorption speed of sample A2 by the absorption speed of sample B2 (absorption speed of A2 / absorption speed of B2), and the value obtained by dividing the absorption speed of sample A3 by the absorption speed of sample B3 (absorption speed of A3 / absorption speed of B3).

[0171] As described above, if 96 hours have passed since the storage body 100 was opened and the diapers were taken out, the compression was relaxed and the influence of the compression almost disappeared. That is, the larger the value (A / B) obtained by dividing the absorption rate of sample A (A1, A2, A3) by the absorption rate of sample B (B1, B2, B3), the closer the absorbency is to the state where the influence of the compression almost disappeared when the diapers were taken out of the storage body 100 and worn (after 5 minutes).

[0172] like Fig. 9 As shown in C, for samples A1, B1, A2 and B2 of thermoplastic resin fibers having a fiber layer bf of a skin-side core wrap 11ba of 13 gsm and 15 gsm, the values ​​obtained by dividing the absorption rate of sample A (A1, A2) by the absorption rate of sample B (B1, B2) (absorption rate of A1 / absorption rate of B1, absorption rate of A2 / absorption rate of B2) are 79.5% and 82.7%, respectively.

[0173] In contrast, for samples A3 and B3 of thermoplastic resin fibers having a fiber layer bf of an 18 gsm skin-side core wrap 11ba of the diaper 1 of this embodiment, the value obtained by dividing the absorption rate of sample A3 by the absorption rate of sample B3 (absorption rate of A3 / absorption rate of B3) is 91.3%.

[0174] According to the results of the absorption rate test, it is clear that for diapers whose thermoplastic resin fiber content in the fiber layer bf of the skin-side core wrap 11ba is less than 18 gsm (samples A1 and B1, sample A2 and B2), the absorption rate 5 minutes after the storage body 100 is opened and the diaper is taken out is less than 85% of the absorption rate 96 hours after the storage body 100 is opened and the diaper is taken out.

[0175] On the other hand, it is also clear that for the diaper 1 (samples A3, B3) having a thermoplastic resin fiber fiber layer bf with an 18 gsm skin-side core wrap 11ba, the absorption rate 5 minutes after the storage body 100 is opened and the diaper 1 is taken out is more than 85% of the absorption rate 96 hours after the storage body 100 is opened and the diaper 1 is taken out.

[0176] Based on the results, it can be understood that the diaper 1 of this embodiment has more than 18 gsm of thermoplastic resin fibers in the fiber layer bf of the skin-side core wrap 11ba, so that the diaper 1, when taken out from the storage body 100 and worn (the state after 5 minutes from the time the diaper 1 is taken out of the storage body 100), has an absorbency (absorption rate of more than 85%) close to the state after 96 hours from the time the storage body 100 is opened and the diaper 1 is taken out.

[0177] Therefore, by making the absorption rate after 5 minutes from the opening of the storage body 100 and the removal of the diaper 1 be 85% or more of the absorption rate after 96 hours from the opening of the storage body 100 and the removal of the diaper 1, the storage body 100 can achieve both compactness of the storage body 100 and maintenance of the absorbency of the diaper 1.

[0178] In the absorbent body 11 of the diaper 1 of the present embodiment, the skin-side core pack 11ba, the absorbent core 11a, and the non-skin-side core pack 11bb are fixed to each other by an adhesive such as a hot-melt adhesive. In addition, the sheet-shaped skin-side core pack 11ba is formed by fixing the base material layer bb and the fiber layer bf by an adhesive such as a hot-melt adhesive. In addition, although the base material layer bb and the fiber layer bf are joined by a hot-melt adhesive in the present embodiment, it is not limited to this. For example, it is also possible to fix the base material layer bb and the fiber layer bf by, for example, entanglement (interweaving) of the fibers of the base material layer bb and the fibers of the fiber layer bf without using an adhesive between them, thereby forming the sheet-shaped skin-side core pack 11ba.

[0179] The fiber layer bf of this embodiment is provided with 18 gsm to 30 gsm of thermoplastic resin fibers. Examples of thermoplastic resin fibers include synthetic fibers such as polyethylene, polyester, polypropylene, and nylon. In addition, the thermoplastic resin fibers of the fiber layer bf are preferably short fibers, specifically, fibers having an average fiber length of 15 mm or more and 100 mm or less.

[0180] As for the fiber layer bf, the fiber constituting the fiber layer bf is preferably a fiber containing PET fiber (polyethylene terephthalate). Since PET fiber has a high rigidity, the fiber layer bf contains PET fiber, so that the thickness of the fiber layer bf is easy to recover after the compression in the self-storage state is released compared with the case where the PET fiber is not contained. In addition, as a fiber layer bf containing PET fiber, it can be a fiber layer bf made of only PET fiber, or it can be a fiber layer bf containing composite fiber containing PET fiber. As a composite fiber containing PET fiber, for example, it is set as a core-sheath type fiber, and PET / PE (core / sheath) can be exemplified.

[0181] It is also preferred that at least part of the fibers of the fiber layer bf have a hydrophilic function. Since the fiber layer bf has hydrophilic fibers, the fiber layer bf is easy to absorb excrement. The easier the fiber layer bf is to absorb excrement, the easier it is to keep the excrement away from the skin of the wearer when wearing it, and the excrement can be difficult to remain on the surface (top sheet 12) of the diaper 1. In addition, the fiber layer bf can be composed of only fibers with a hydrophilic function, or it can be a structure composed of a combination of fibers with a hydrophilic function and fibers without a hydrophilic function. Moreover, as for the fibers with a hydrophilic function, it can be a fiber that is hydrophilic in itself, or it can be a fiber that is hydrophilized. For example, the fiber layer bf can also be composed of PET fibers that are hydrophilized on the surface. When the fiber layer bf is composed of a composite fiber of PET / PE (core / sheath), it can also be a surface of PE that is hydrophilized. As a hydrophilic treatment, known hydrophilic techniques such as SR treatment, application of a hydrophilic oil agent, graft polymerization of a hydrophilic monomer, and plasma treatment can be used.

[0182] The base material layer bb is a sheet-like layer, and examples thereof include tissue paper, spunbonded nonwoven fabric, etc. The base material layer bb is preferably formed of long fibers, and specifically, preferably formed of fibers having an average fiber length of more than 100 mm.

[0183] Preferably, at least part of the fibers of the substrate layer bb have a hydrophilic function. Since the substrate layer bb has hydrophilic fibers, the substrate layer bb is easy to absorb excrement. The easier the substrate layer bb absorbs excrement, the easier it is to keep the excrement away from the wearer's skin when the diaper is worn, and the excrement is not likely to remain on the surface (top sheet 12) of the diaper 1. In addition, the substrate layer bb can be composed only of fibers with a hydrophilic function, or it can be a structure composed of a combination of fibers with a hydrophilic function and fibers without a hydrophilic function. Moreover, as for the fibers with a hydrophilic function, the fibers themselves can be hydrophilic, or they can be hydrophilic treatments. As a hydrophilization treatment, known hydrophilization techniques such as SR treatment, application of a hydrophilic oil agent, graft polymerization of a hydrophilic monomer, and plasma treatment can be used.

[0184] The substrate layer bb of the diaper 1 of this embodiment is formed of hydrophilic fiber tissue paper. Since the substrate layer bb is formed of hydrophilic fiber, the substrate layer bb easily absorbs liquid. In addition, since the substrate layer bb is formed of hydrophilic fiber tissue paper, it is easy to move the excrement absorbed from the skin side of the diaper 1 (the skin side of the top sheet 12) from the top sheet 12 to the substrate layer bb when the diaper 1 is worn, it is easy to move the excrement away from the wearer's skin. In addition, the risk of excrement absorbed by the absorbent body 11 returning to the top sheet 12 can be reduced.

[0185] The substrate layer bb is not limited to being formed by cotton paper. For example, it can also be a spunbond / meltblown / spunbond nonwoven fabric (SMS nonwoven fabric) formed by hydrophilic fibers. In the case where the substrate layer bb is formed by a spunbond / meltblown / spunbond nonwoven fabric of hydrophilic fibers, it is also the same as the case of hydrophilic cotton paper. When the diaper 1 is worn, it is easy to move the excrement absorbed from the skin side of the diaper 1 (the skin side of the top sheet 12) from the top sheet 12 to the substrate layer bb, thereby making it easy to keep the excrement away from the wearer's skin. In addition, the risk of excrement already absorbed by the absorbent 11 returning to the top sheet 12 can be reduced. Moreover, at least part of the fibers of the spunbond / meltblown / spunbond nonwoven fabric (SMS nonwoven fabric) constituting the substrate layer bb are hydrophilic fibers.

[0186] It is also preferred that, in the skin-side core wrap 11ba, the fiber layer bf is provided at a position closer to the absorbent core 11a than the substrate layer bb, that is, at a position closer to the non-skin side of the absorbent body 11 than the substrate layer bb. In the skin-side core wrap 11ba, the fiber layer bf is provided at a position closer to the absorbent core 11a than the substrate layer bb, so that the fiber layer bf is adjacent to the absorbent core 11a. If the diaper 1 in the compressed storage state is taken out and the compression of the diaper 1 (absorbent body 11) and the fiber layer bf is released, the thickness of the fiber layer bf is restored, and the intervals between the fibers (thermoplastic resin fibers) in the fiber layer bf are expanded. The intervals between the fibers (thermoplastic resin fibers) in the fiber layer bf tend to become longer than the intervals between the fibers (liquid absorbent fibers) in the absorbent core 11a. Thus, when the diaper 1 is worn, the excrement absorbed from the skin side of the diaper 1 can be easily moved from the fiber layer bf to the absorbent core 11a adjacent to the fiber layer bf from the non-skin side by the capillary phenomenon, so that the excrement can be easily kept away from the wearer's skin. In other words, the comfort when the diaper is worn can be easily improved.

[0187] It is also preferred that, when the fiber layer bf of the skin-side core wrap 11ba is provided at a position closer to the absorbent core 11a than the base layer bb, the thermoplastic resin fibers of the fiber layer bf have a portion interlaced with the liquid absorbent fibers of the absorbent core 11a. As for the absorbent body 11 of the diaper 1, since the fiber layer bf is easier to be flattened and deformed than the absorbent core 11a, the risk of the absorbent core 11a being flattened and deformed when the diaper 1 is taken out of the storage body 100 can be reduced. In addition, since the thermoplastic resin fibers of the fiber layer bf are interlaced with the liquid absorbent fibers of the absorbent core 11a, it is easy to move excrement from the fiber layer bf located on the skin side to the absorbent core 11a located on the non-skin side when the diaper 1 is worn, it is easy to keep the excrement away from the wearer's skin. Therefore, the risk of excrement continuously contacting the wearer's skin can be reduced, thereby improving the comfort when the diaper is worn. Moreover, when an adhesive is used to fix the skin-side core package 11ba (fiber layer bf) and the absorbent core 11a as in the present embodiment, the amount of adhesive used for fixing can be reduced by interweaving the fibers with each other, or instead of using an adhesive or other fixing means between the skin-side core package 11ba (fiber layer bf) and the absorbent core 11a, the skin-side core package 11ba (fiber layer bf) and the absorbent core 11a can be fixed by interweaving the fibers with each other.

[0188] It is also preferred that, in the skin-side core pack 11ba, the weight per unit area of ​​the thermoplastic resin fibers of the fiber layer bf (the weight of the thermoplastic resin fibers per unit area) is higher than the weight per unit area of ​​the fibers of the substrate layer bb (the weight of the fibers per unit area). By utilizing the elasticity of the thermoplastic resin fibers of the fiber layer bf, even if the fiber layer bf has shrunk in the thickness direction and has become a stored state, its thickness is easily restored in the restored state. By making the weight per unit area of ​​the thermoplastic fibers of the fiber layer bf higher than the weight per unit area of ​​the fibers of the substrate layer bb, it is easier to restore the thickness of the fiber layer bf of the diaper 1 compressed in the state of the storage body 100 than in the case where the weight per unit area of ​​the thermoplastic resin fibers of the fiber layer bf is lower than the weight per unit area of ​​the fibers of the substrate layer bb.

[0189] Diaper 1 preferably has top sheet 12 at the position closer to the skin side than skin side core bag part 11ba as mentioned above, and the unit area weight of the thermoplastic resin fiber of fiber layer bf is preferably higher than the unit area weight of the fiber of top sheet 12. Even if fiber layer bf has shrunk in the thickness direction and becomes the storage state by utilizing the elasticity of the thermoplastic resin fiber of fiber layer bf, its thickness is also easy to recover in the recovery state. Therefore, by making the unit area weight of the thermoplastic resin fiber of fiber layer bf higher than the unit area weight of the fiber of top sheet 12, it is easy to recover the thickness of fiber layer bf of diaper 1 compressed in the state of storage body 100 compared with the situation that the unit area weight of the thermoplastic resin fiber of fiber layer bf is lower than the unit area weight of the fiber of top sheet 12.

[0190] It is also preferred that, when the diaper 1 has a top sheet 12 at a position closer to the skin side than the skin side core package 11ba, the average value of the thickness of the thermoplastic resin fiber of the fiber layer bf is greater than the average value of the thickness of the fiber of the top sheet 12. By utilizing the elasticity of the thermoplastic resin fiber of the fiber layer bf, even if the fiber layer bf has shrunk in the thickness direction and has become a storage state, its thickness is also easy to recover in the recovery state. Therefore, by making the average value of the thickness of the thermoplastic resin fiber of the fiber layer bf greater than the average value of the thickness of the fiber of the top sheet 12, it is easy to restore the thickness of the fiber layer bf of the diaper 1 compressed in the state of the storage body 100 compared with the case where the average value of the thickness of the thermoplastic resin fiber of the fiber layer bf is less than the average value of the thickness of the fiber of the top sheet 12. In addition, the average value of the thickness of the thermoplastic resin fiber of the fiber layer bf and the average value of the thickness of the fiber of the top sheet 12 can be measured by a well-known method. For example, the average value of each fiber can be inferred using an enlarged image obtained by a digital microscope, a scanning electron microscope, etc.

[0191] In addition, the diaper 1 preferably has an outer sheet 14 at the position closest to the non-skin side as described above, and the weight per unit area of ​​the thermoplastic resin fiber of the fiber layer bf is preferably higher than the weight per unit area of ​​the fiber of the outer sheet 14. By utilizing the elasticity of the thermoplastic resin fiber of the fiber layer bf, even if the fiber layer bf has been shrunk in the thickness direction and has become a stored state, its thickness is easily restored in the restored state. Therefore, by making the weight per unit area of ​​the thermoplastic resin fiber of the fiber layer bf higher than the weight per unit area of ​​the fiber of the outer sheet 14, it is easier to restore the thickness of the fiber layer bf of the diaper 1 compressed in the state of the storage body 100 than in the case where the weight per unit area of ​​the thermoplastic resin fiber of the fiber layer bf is lower than the weight per unit area of ​​the fiber of the outer sheet 14.

[0192] Preferably, after 96 hours have passed since the storage body 100 was opened and the diaper 1 was taken out ( Figure 8The thickness Tfr of the fiber layer bf of the storage body 100 is divided by the thickness Tfr of the fiber layer bf of the storage body 100 when the diaper 1 is taken out ( Figure 8 The value (Tfr / Tfp) obtained by measuring the thickness Tfp of the fiber layer bf of the fiber layer bf of the storage body 100 is 96 hours after the storage body 100 is opened and the diaper 1 is taken out ( Figure 8 B) is divided by the thickness Tar of the absorbent core 11a when the storage body 100 is opened and the diaper 1 is taken out ( Figure 8 A) is equal to or less than a value (Tar / Tap) obtained by measuring the thickness Tap of the absorbent core 11a (Tfr / Tfp≤Tar / Tap).

[0193] Thus, when a force is applied to the diaper 1 in the stacking direction in the stored state, the fiber layer bf of the skin-side core pack 11ba is easier to be flattened and deformed than the absorbent core 11a, compared with the case where Tfr / Tfp>Tar / Tap. Therefore, even when the diaper 1 is compressed in the stacking direction to make the storage body 100 compact, in the absorbent body 11 of the diaper 1, the fiber layer bf is easier to be flattened or deformed than the absorbent core 11a, so the risk of the absorbent core 11a being flattened or deformed can be reduced. Thus, the risk of excessive flattening or deformation of the absorbent core 11a can be reduced while making the storage body 100 compact, so the risk of reduced absorbency of the diaper 1 can be reduced.

[0194] It is also preferred that the diaper 1 of the present embodiment has a fiber layer bf at a position closer to the absorbent core 11a than the base layer bb, and has a top sheet (skin side sheet) 12 at a position closer to the skin side than the skin side core package 11ba (base layer bb), and that an adhesive is used for fixing between the top sheet 12 and the base layer bb, and an adhesive is used for fixing between the base layer bb and the fiber layer bf. In such a case, it is more preferred that the unit area weight of the adhesive between the base layer bb and the fiber layer bf is lower than the unit area weight of the adhesive between the top sheet 12 and the base layer bb.

[0195] Generally speaking, adhesives such as hot melt adhesives may hinder the absorption of excrement. Therefore, by making the unit area weight of the adhesive between the base layer bb and the fiber layer bf lower than the unit area weight of the adhesive between the top sheet 12 and the base layer bb, when the excrement is absorbed from the skin side of the diaper 1 in the wearing state, the excrement is easily moved from the base layer bb to the fiber layer bf, and thus the excrement is easily kept away from the wearer's skin. As a result, the discomfort caused by the continuous contact between the excrement and the wearer's skin in the wearing state can be reduced.

[0196] Although the skin-side core wrap 11ba in the core wrap sheet 11b in this embodiment includes a base material layer bb and a fiber layer bf, and the non-skin-side core wrap 11bb is set as a normal core wrap sheet that does not include a base material layer bb and a fiber layer gf, it is not limited thereto. The non-skin-side core wrap 11bb may also be composed of a base material layer (not shown) and a fiber layer (not shown) in the same manner as the skin-side core wrap 11ba. In the storage body 100, even when the diaper 1 is in a compressed state, the risk of the absorbent core 11a being flattened or deformed can be further reduced by making it easy to compress not only the fiber layer bf of the skin-side core wrap 11ba of the diaper 1 but also the fiber layer of the non-skin-side core wrap 11bb. This can reduce the risk of reduced absorbency due to compression of the absorbent core 11a. In addition, since the fiber layer bf of the skin-side core package 11ba and the fiber layer of the non-skin-side core package 11bb compressed in the stored state are easy to recover in the restored state, it is easy to restore the thickness and softness of the absorbent body 11 (diaper 1) compared with the diaper 1 in the stored state, and it is also easy to reduce the decrease in skin touch when worn.

[0197] It is also preferred that, when the non-skin side core pack 11bb is composed of a base material layer and a fiber layer, the fiber layer is provided at a position closer to the absorbent core 11a side (skin side) than the base material layer in the non-skin side core pack 11bb. In the storage body 100, even when the diaper 1 is in a compressed state, the fiber layer bf of the skin side core pack 11ba of the diaper 1 is easily compressed, and the fiber layer of the non-skin side core pack 11bb adjacent to the absorbent core 11a is also easily compressed, thereby further reducing the risk of the absorbent core 11a being flattened or deformed. This can reduce the risk of reduced absorbency due to compression of the absorbent core 11a.

[0198] Furthermore, the diaper 1 may include a compressed portion e formed by compressing at least the absorbent core 11a and the skin-side corepack 11ba at a position where the absorbent core 11a and the skin-side corepack 11ba overlap when viewed from the skin side. Fig.10 It is a plan view of the absorbent body 10 when the absorbent body 11 includes the compressed portion e. Fig.10 The absorbent body 10 shown is provided with a plurality of compression parts e, which are formed by compressing the top sheet 12, the skin-side core wrap 11ba, the absorbent core 11a and the non-skin-side core wrap 11bb in the thickness direction. The compression part e only needs to have a portion formed by compressing at least the absorbent core 11a and the skin-side core wrap 11ba at the position where the absorbent core 11a and the skin-side core wrap 11ba overlap when observing the absorbent body 10 (diaper 1) from the skin side. Fig.10In the absorbent body 10 shown, a plurality of circular compressed portions e are arranged in a staggered pattern (dot pattern) over substantially the entire region of the region overlapping the absorbent core 11 a when viewed from the skin side of the diaper 1 .

[0199] exist Fig.10 In the figure, the area where the compression part e is not provided in the area overlapping with the absorbent core 11a when the absorbent body 10 is observed from the skin side, i.e., the uncompressed area is set as the non-compressed part n, and is indicated by the oblique line portion slanting downward to the left. The non-compressed part n has a lower density of liquid-absorbent fibers of the absorbent core 11a and a lower density of fibers of the fiber layer bf than the compression part e. Although in the present embodiment, the part where the density of liquid-absorbent fibers of the absorbent core 11a and the density of fibers of the fiber layer bf are lower than those of the compression part e is set as the non-compressed part n, it is not limited to this. The non-compressed part n may be replaced by the following part: although this part is a compressed part in the absorbent body 10 (absorber 11), the density of liquid-absorbent fibers of the absorbent core 11a and the density of fibers of the fiber layer bf are lower than those of the compression part e. That is, it is preferred to have a compressed portion e and a low-density portion (equivalent to the non-compressed portion n), regardless of whether there is compression or not, and the density of the liquid absorbent fibers of the absorbent core 11a in the low-density portion is lower than that of the compressed portion e and the density of the fibers of the fiber layer bf is lower.

[0200] Since the compressed portion e is a high-density portion where the density of the fiber is increased, the excrement is easily introduced into the compressed portion e by utilizing the capillary phenomenon. Therefore, in the worn state, the diaper 1 has the compressed portion e formed by compressing at least the absorbent core 11a and the skin-side core wrap portion 11ba, so that when the fiber layer bf of the skin-side core wrap portion 11ba absorbs excrement, the absorbed excrement is easily introduced into the compressed portion e and easily diffused along the compressed portion e, so that the risk of local bulging of the fiber layer bf of the skin-side core wrap portion 11ba is easily reduced.

[0201] In addition, in the present embodiment, a plurality of circular compression parts e are arranged in a staggered shape, but it is not limited thereto. The compression part e can be one or more. In addition, the compression part e can also be in any shape such as a circle or a rectangle. Moreover, the compression part e can also be arranged in any configuration such as a staggered shape, a linear shape (belt shape), a lattice shape, etc.

[0202] However, it is preferred that Fig.10As shown, in the longitudinal direction or left-right direction of the diaper 1 (absorbent body 10), the compressed portion e has a portion adjacent to the non-compressed portion n (low-density portion). Thus, when the diaper 1 is worn, first, the compressed portion e where the density of each fiber is high easily absorbs liquid by capillary action, and easily moves the excreted excrement from the wearer's skin toward the absorbent core 11a. It is easy to move the excrement already absorbed by the compressed portion e to the non-compressed portion n (low-density portion) adjacent in the longitudinal direction or left-right direction. Therefore, the risk of the absorption capacity of the compressed portion e decreasing due to the absorption of a large amount of excrement exceeding the absorption capacity of the compressed portion e can be reduced. In addition, it is easy to reduce the risk of continuous contact between excrement and the wearer's skin, and it is easy to reduce the discomfort during wearing and the risk of excrement leaking from the diaper 1.

[0203] In the image Fig.10 In the case where the absorbent body 10 (diaper 1) shown has a compressed portion e and a non-compressed portion n at the position where the absorbent core 11a and the skin-side core wrap 11ba overlap when viewed from the skin side, it is preferred that, in the thickness direction of the diaper 1 (absorbent body 10), the center of the length of the compressed portion e from the skin side of the skin-side core wrap 11ba to the non-skin side of the absorbent core 11a is located closer to the skin side than the center of the length of the non-compressed portion n from the skin side of the skin-side core wrap 11ba to the non-skin side of the absorbent core 11a. The length of the compressed portion e and the non-compressed portion n from the skin side of the skin-side core wrap 11ba to the non-skin side of the absorbent core 11a refers to the length in the restored state (refer to Figure 8 L11 in the figure). Thus, when the diaper 1 is worn, first, the compressed part e where the density of each fiber is high easily absorbs liquid by the capillary phenomenon, and the excrement discharged is easily moved from the wearer's skin to the absorbent core 11a. Therefore, while the excrement is easily moved away from the wearer's skin, the excrement absorbed by the compressed part e is easily moved to the non-compressed part n (low-density part), which can reduce the risk of the excrement continuing to stay in the compressed part e, thereby reducing the risk of delayed absorption of the excrement of the diaper 1.

[0204] In addition, the diaper 1 has an absorbent core 11a having at least liquid-absorbent fibers (e.g., pulp fibers) and a superabsorbent polymer (SAP), and a skin-side core wrap 11ba disposed adjacent to the skin side of the absorbent core 11a, wherein the skin-side core wrap 11ba is composed of a base material layer bb and a fiber layer bf ( Figure 5B , Figure 8) case, with respect to the substrate layer bb and the fiber layer bf, it is preferred that the unit area weight of the thermoplastic resin fibers of the fiber layer bf (the weight of the thermoplastic resin fibers per unit area) is higher than the unit area weight of the fibers of the substrate layer bb (the weight of the fibers per unit area), and the fiber layer bf is arranged on the absorbent core 11a side (the non-skin side) of the substrate layer bb.

[0205] Thus, in the stored state or in the wearing state of the diaper 1 by the wearer, when a force is applied to the diaper 1 in the thickness direction, the fiber layer bf of the skin-side core pack 11ba is more likely to be crushed and deformed than the absorbent core 11a. Therefore, even when the diaper 1 is compressed in the thickness direction, the fiber layer bf shrinks in the thickness direction compared to the absorbent core 11a in the absorbent body 11 of the diaper 1, thereby reducing the risk of the absorbent core 11a being crushed or deformed.

[0206] ===Other Implementation Methods===

[0207] Although the embodiments of the present invention are described above, the above embodiments are used to facilitate the understanding of the present invention and are not used to limit the interpretation of the present invention. It is also self-evident that the present invention can be changed and improved without departing from the gist of the present invention, and the equivalents of these changes and improvements are included in the present invention.

Claims

1. An absorbent article storage body, comprising: a plurality of absorbent articles; and A storage device for storing a plurality of absorbent articles, characterized in that: The plurality of absorbent articles are stored in the storage member as an absorbent article group stacked in a predetermined direction. The absorbent article has: an absorbent core comprising at least liquid-absorbent fibers and a superabsorbent polymer; and a skin-side core wrap portion disposed adjacent to the skin-side of the absorbent core, The skin-side core package is composed of a base material layer and a fiber layer. The fiber layer is provided with thermoplastic resin fibers of 18 gsm or more, The length of the absorbent article group in the unopened absorbent article storage body in the predetermined direction is 70% or less of the length of the absorbent article group in the predetermined direction 96 hours after the absorbent article storage body is opened and the absorbent article group is taken out, Furthermore, the absorption rate in an absorption rate test of the absorbent article 5 minutes after the absorbent article storage body is opened and the absorbent article is taken out is at least 85% of the absorption rate in the absorption rate test of the absorbent article 96 hours after the absorbent article storage body is opened and the absorbent article is taken out.

2. The absorbent article storage body according to claim 1, wherein: The fiber layer is provided on the absorbent core side relative to the base material layer.

3. The absorbent article storage body according to claim 2, wherein: The thermoplastic resin fibers of the fiber layer have portions intertwined with the liquid absorbent fibers of the absorbent core.

4. The absorbent article storage body according to claim 2 or 3, characterized in that: The absorbent article has a skin side sheet at a position closer to the skin side than the skin side core pack portion. The skin side sheet and the base layer are fixed with an adhesive. The base material layer and the fiber layer are fixed with an adhesive. The weight per unit area of ​​the adhesive between the substrate layer and the fiber layer is lower than the weight per unit area of ​​the adhesive between the skin-side sheet and the substrate layer.

5. The absorbent article storage body according to any one of claims 1 to 3, wherein: The base material layer includes fibers having a hydrophilic function.

6. The absorbent article storage body according to claim 5, characterized in that: The absorbent article has a skin side sheet at a position closer to the skin side than the skin side core pack portion. The base material layer is tissue paper formed of hydrophilic fibers.

7. The absorbent article storage body according to claim 5, wherein: The absorbent article has a skin side sheet at a position closer to the skin side than the skin side core pack portion. The substrate layer is a spunbond / meltblown / spunbond nonwoven fabric formed of hydrophilic fibers.

8. The absorbent article storage body according to any one of claims 1 to 3, wherein: The thermoplastic resin fibers of the fiber layer have a higher basis weight than the fibers of the base material layer.

9. The absorbent article storage body according to any one of claims 1 to 3, wherein: The absorbent article has a skin side sheet at a position closer to the skin side than the skin side core pack portion. The thermoplastic resin fibers of the fiber layer have a basis weight higher than that of the fibers of the skin-side sheet.

10. The absorbent article storage body according to any one of claims 1 to 3, wherein: The absorbent article has an outer sheet at a position closest to the non-skin side. The thermoplastic resin fibers of the fiber layer have a basis weight higher than that of the fibers of the exterior sheet.

11. The absorbent article storage body according to any one of claims 1 to 3, wherein: The absorbent article has a skin side sheet at a position closer to the skin side than the skin side core pack portion. An average value of the thickness of the thermoplastic resin fibers of the fiber layer is larger than an average value of the thickness of the fibers of the skin-side sheet.

12. The absorbent article storage body according to any one of claims 1 to 3, wherein: The absorbent article has a non-skin side core wrap portion disposed adjacent to the non-skin side of the absorbent core. The non-skin-side core pack is composed of the base material layer and the fiber layer.

13. The absorbent article storage body according to claim 12, wherein: The fiber layer of the non-skin-side corepack is provided on the absorbent core side relative to the base material layer.

14. The absorbent article storage body according to any one of claims 1 to 3, wherein: The absorbent article has a compressed portion formed by compressing at least the absorbent core and the skin-side core wrap portion at a position where the absorbent core and the skin-side core wrap portion overlap when viewed from the skin side.

15. The absorbent article storage body according to claim 14, wherein: The absorbent article has a non-compressed portion where the absorbent core and the skin-side core wrap portion are not compressed at a position where the absorbent core and the skin-side core wrap portion overlap when viewed from the skin side. In the thickness direction of the absorbent article, The center of the length of the compressed portion from the skin side of the skin side core wrap to the non-skin side of the absorbent core is located closer to the skin side than the center of the length of the non-compressed portion from the skin side of the skin side core wrap to the non-skin side of the absorbent core.

16. The absorbent article storage body according to claim 14, wherein: The absorbent article has a low-density portion where the density of the liquid-absorbent fibers of the absorbent core is lower than that of the compressed portion and the density of the fibers of the fiber layer is lower, at a position where the absorbent core and the skin-side core wrap overlap when viewed from the skin side. The compressed portion has a portion adjacent to the low-density portion in the longitudinal direction or the left-right direction of the absorbent article.

17. The absorbent article storage body according to any one of claims 1 to 3, wherein: The value obtained by dividing the thickness of the fiber layer 96 hours after the absorbent article storage body is opened and the absorbent article is taken out by the thickness of the fiber layer when the absorbent article storage body is opened and the absorbent article is taken out is less than the value obtained by dividing the thickness of the absorbent core 96 hours after the absorbent article storage body is opened and the absorbent article is taken out by the thickness of the absorbent core when the absorbent article storage body is opened and the absorbent article is taken out.

18. The absorbent article storage body according to any one of claims 1 to 3, characterized in that: The fiber layer contains PET fibers.

19. The absorbent article storage body according to any one of claims 1 to 3, wherein: At least part of the fibers in the fiber layer have a hydrophilic function.

20. An absorbent article comprising: an absorbent core comprising at least liquid-absorbent fibers and a superabsorbent polymer; and The skin-side core wrap portion is provided adjacent to the skin-side surface of the absorbent core, and is characterized in that: The skin-side core package is composed of a base material layer and a fiber layer. The thermoplastic resin fibers of the fiber layer have a higher unit area weight than the fibers of the substrate layer. The fiber layer is provided on the absorbent core side relative to the base material layer.

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