Pants-type absorbent article

Abstract

A pants-type absorbent article (1) is provided with an absorbent main body (10) provided with an absorbent core (11), and a waist-encircling member (20), the waist-encircling member (20) being disposed on at least one side of the waist-encircling member (20) in the front-rear direction. The absorbent article (1) is provided with: first elastic members (E1, 25) that are disposed at positions that do not overlap the absorbent core (11) in the vertical direction and that are capable of expanding and contracting in the left-right direction; and second elastic members (E2, 27) that are disposed at positions that overlap the absorbent core (11) in the vertical direction and that are capable of expanding and contracting in the left-right direction. The absorbent article (1) is also provided with a region in which the waist member (20) that is stretched in the left-right direction overlaps the absorbent core (11). The total length of the attachment means (50) for attaching the first elastic members (E1, 25) to the waist-encircling member (20) is smaller than the total length of the attachment means (70) for attaching the second elastic members (E2, 27) to the waist-encircling member (20).

Description

Technical Field

[0001] The present invention relates to a pant-type absorbent article. Background Art

[0002] Conventionally, there are known shorts-type absorbent articles in which an elastic member having stretchability in the left-right direction is provided on a waist member. For example, Patent Document 1 discloses a shorts-type diaper having the following structure: a hot-melt adhesive is applied to the outer surface of an elastic member 12C sandwiched between an outer layer 12S and an inner layer 12H constituting an outer sheet 12 (corresponding to the waist member), and the two layers 12S and 12H are bonded via the adhesive and the elastic member 12C.

[0003] Prior Art Literature

[0004] Patent Literature

[0005] Patent Document 1: Japanese Patent Application Publication No. 2012-61348 Summary of the invention

[0006] Problems to be solved by the invention

[0007] In the shorts-type diaper of Patent Document 1, a plurality of elastic and retractable members 12C are respectively mounted on the waist member using hot-melt adhesives that are evenly applied. That is, the elastic members are mounted on the waist member by the same mounting mechanism. However, in the portion overlapping with the absorbent core in the thickness direction, if the length of the mounting mechanism in the left-right direction is short, the portion to which the elastic members are fixed is short, and thus it is easy to stretch, and when the waist member is pulled, it is difficult to pull up the absorbent core or to make the absorbent core close to the body, and there is a possibility that the wearability is easy to deteriorate. On the other hand, in the portion not overlapping with the absorbent core in the thickness direction, if the length of the mounting mechanism in the left-right direction is long, the fixed portion is long, and thus the waist member itself becomes hard, and there is a possibility that the skin touch is easy to deteriorate.

[0008] The present invention has been made in view of the above-mentioned problems, and an object of the present invention is to provide a pants-type absorbent article which can improve the wearability of an absorbent core and has a good skin feel.

[0009] Solutions to Solve Problems

[0010] The main invention for achieving the above-mentioned purpose is a shorts-type absorbent article, which has mutually intersecting up and down directions, left and right directions, and front and back directions, and has an absorbent body with an absorbent core with liquid absorption and a waist member, characterized in that at least one side of the above-mentioned front and back directions of the above-mentioned waist member has: a first elastic member, which is arranged at a position that does not overlap with the above-mentioned absorbent core in the above-mentioned up and down directions, and can be stretched and contracted in the above-mentioned left and right directions; and a second elastic member, which is arranged at a position that overlaps with the above-mentioned absorbent core in the above-mentioned up and down directions, and can be stretched and contracted in the above-mentioned left and right directions, and in the above-mentioned left and right directions, in the area where the above-mentioned waist member in an extended state overlaps with the above-mentioned absorbent core, the total length of the mounting mechanism for mounting the above-mentioned first elastic member on the above-mentioned waist member is less than the total length of the mounting mechanism for mounting the above-mentioned second elastic member on the above-mentioned waist member.

[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 possible to provide a pants-type absorbent article which can improve the wearability of an absorbent core and has a good feel to the skin. BRIEF DESCRIPTION OF THE DRAWINGS

[0014] Figure 1 This is a schematic perspective view showing one structural example of the diaper 1.

[0015] Figure 2 This is a schematic plan view of the diaper 1 in the unfolded and stretched state as viewed from the skin side in the thickness direction.

[0016] Figure 3 yes Figure 2 Schematic diagram of the A-A section.

[0017] Figure 4 It is a top view and a cross-sectional view of the absorbent body 10.

[0018] Figure 5 This is a diagram for explaining a range in which a plurality of welded portions 50 are formed in the waist member 20 .

[0019] Figure 6 It is a diagram for explaining an example of the arrangement of the welded portion 50 .

[0020] Fig. 7A as well as Figure 7B This is a diagram for explaining the principle of attaching the waist elastic member 25 to the waist member 20 using the welded portion 50 .

[0021] Figure 8This is a diagram for explaining the range in which the adhesive portion 70 for attaching the leg elastic members 27 is formed in the waist member 20.

[0022] Fig. 9 It is a top view explaining the state of the rear side of the diaper 1 in the stretched state.

[0023] Fig.10 It is a schematic plan view of a diaper 2 according to a modified example in a developed and stretched state. DETAILED DESCRIPTION

[0024] At least the following matters will be apparent from the description of this specification and the accompanying drawings.

[0025] (Method 1)

[0026] A shorts-type absorbent article, which has mutually intersecting up-down direction, left-right direction and front-back direction, and has an absorbent body with an absorbent core having liquid absorbency and a waist member, characterized in that at least one side of the above-mentioned front-back direction of the above-mentioned waist member has: a first elastic member, which is arranged at a position that does not overlap with the above-mentioned absorbent core in the above-mentioned up-down direction and can be stretched and contracted in the above-mentioned left-right direction; and a second elastic member, which is arranged at a position that overlaps with the above-mentioned absorbent core in the above-mentioned up-down direction and can be stretched and contracted in the above-mentioned left-right direction, and in the above-mentioned left-right direction, in the area where the above-mentioned waist member in an extended state overlaps with the above-mentioned absorbent core, the total length of the mounting mechanism for mounting the above-mentioned first elastic member on the above-mentioned waist member is less than the total length of the mounting mechanism for mounting the above-mentioned second elastic member on the above-mentioned waist member.

[0027] According to the shorts type absorbent article of mode 1, the length of the mounting mechanism of the second elastic member is relatively long, and it is difficult to over-stretch, so that the force of pulling the waist member upward during wearing is easy to act on the absorbent core. Therefore, the absorbent core can be easily matched to the crotch of the wearer. In addition, since the length of the mounting mechanism of the first elastic member is relatively short, the rigidity of the waist member can be suppressed from being excessively increased. Thus, the wearability of the absorbent core can be improved, and a good skin touch can be easily achieved.

[0028] (Method 2)

[0029] The pants-type absorbent article according to aspect 1 is characterized in that a part of the second elastic member is arranged in a direction intersecting the left-right direction.

[0030] According to the shorts-type absorbent article of embodiment 2, the stress exerted by the second elastic member includes a component in the up-down direction, so that when the waist member is pulled upward during wearing, the absorbent core is easily pulled upward by the contraction force of the second elastic member. As a result, the absorbent core is easily pulled upward, and the wearability can be further improved.

[0031] (Method 3)

[0032] The pants-type absorbent article according to aspect 1 or 2 is characterized in that the second elastic member is attached to the waist member by the attachment mechanism using an adhesive.

[0033] According to the pants-type absorbent article of the third embodiment, since the waist member and the second elastic member are more integrated, the second elastic member and the waist member can be linked to each other during the wearing operation, and the absorbent core can be further pulled up. In addition, the second elastic member can be fixed along a desired path by using a mounting mechanism using an adhesive, so that the degree of freedom of design is improved, and even in the case of including a portion intersecting with the left-right direction, elasticity can be freely given to the waist member.

[0034] (Method 4)

[0035] The pants-type absorbent article according to any one of aspects 1 to 3 is characterized in that the second elastic member is attached to the waist member in a region on the outside in the left-right direction relative to the absorbent core by the attachment mechanism using the adhesive.

[0036] According to the shorts-type absorbent article of embodiment 4, the second elastic member and the waist member are more integrated at the position outside the absorbent core in the left-right direction, thereby making it easier for the force when the waist member is pulled and pulled up in the left-right direction to act on the absorbent core. Therefore, it is easy for the force to effectively act on the absorbent core via the second elastic member, and it is easier to pull up the absorbent core.

[0037] (Method 5)

[0038] A shorts-type absorbent article as described in any one of methods 1 to 4, characterized in that the shorts-type absorbent article has a pair of leg openings, and the second elastic member is attached to the waist member in an area along the contour of the leg openings by using the mounting mechanism using the adhesive.

[0039] According to the pants-type absorbent article of embodiment 5, the second elastic member is provided integrally with the waist member along the contour of the leg opening, so that when the wearer wears the pants-type absorbent article, the force for pulling up the waist member is easily applied to the leg opening, thereby preventing the leg opening from being caught on the wearer's legs. Thus, the waist member and the absorbent core can be further pulled up.

[0040] (Method 6)

[0041] A shorts-type absorbent article as described in any one of methods 1 to 5, characterized in that the waist member has a first sheet and a second sheet stacked on the non-skin side compared to the first sheet, the first sheet and the second sheet are joined to each other by means of a plurality of scattered welds, and the first elastic member is mounted on the waist member by being sandwiched between two adjacent welds in the up and down direction.

[0042] According to the pants-type absorbent article of the sixth aspect, the welded portions where the first sheet and the second sheet are joined are formed discretely, and the first elastic member can be attached by utilizing the welded portions, so that the softness and elasticity of the waist member can be easily maintained. In addition, since the first sheet and the second sheet are joined by the welded portions, the joining strength of the waist member can be easily ensured, and even if the waist member is pulled up during wearing, the waist member is unlikely to be broken or the sheets are unlikely to be separated from each other.

[0043] (Method 7)

[0044] The shorts-type absorbent article as described in Mode 6 is characterized in that the waist member has a plurality of the first elastic members spaced apart in the up-down direction, and a welding portion that does not contact the first elastic member is provided between two adjacent first elastic members in the up-down direction.

[0045] According to the pants-type absorbent article of embodiment 7, the welded portion is also provided in the portion that does not contribute to the attachment of the first elastic member, so that the bonding strength between the first sheet and the second sheet constituting the waist member is further improved. Therefore, even if the waist member is pulled during wearing, it is easier to prevent the waist member from breaking.

[0046] (Method 8)

[0047] The shorts-type absorbent article as described in Mode 6 or Mode 7 is characterized in that the above-mentioned second elastic member is sandwiched between the above-mentioned first sheet and a third sheet stacked on the non-skin side compared to the above-mentioned first sheet, and a portion where the above-mentioned second sheet and the above-mentioned third sheet overlap is provided in the above-mentioned up and down directions.

[0048] According to the shorts-type absorbent article of embodiment 8, at least three layers of sheet members (first to third sheets) are stacked in the thickness direction at the portion where the second sheet and the third sheet overlap, and the strength is higher than that of other portions of the waist member. Thus, when the waist member is pulled up during wearing, it is easy to prevent the waist member from breaking.

[0049] (Method 9)

[0050] The pants-type absorbent article according to any one of aspects 6 to 8 is characterized in that, in the up-down direction, a portion where the first sheet and the second sheet are joined and a portion where the second sheet and the third sheet are joined at least partially overlap.

[0051] According to the pants-type absorbent article of aspect 9, the first to third sheets can be easily integrated, and the strength of the overlapping portion can be further improved. Therefore, the waist member can be made more difficult to be broken.

[0052] (Method 10)

[0053] A shorts-type absorbent article as described in any one of methods 6 to 9, characterized in that the shorts-type absorbent article has a plurality of welded portion rows arranged at intervals in the up-down direction, and at least a portion of the welded portion rows is arranged to span the outer end of the absorbent body in the left-right direction.

[0054] According to the pants-type absorbent article of embodiment 10, the strength of the boundary portion between the waist member and the absorbent body (the portion overlapping the two side ends of the absorbent body) becomes higher. Therefore, the strength of the waist member is enhanced at the boundary portion where stress is easily concentrated, and the durability of the waist member can be improved.

[0055] (Method 11)

[0056] The shorts-type absorbent article according to any one of aspects 6 to 10 is characterized in that a folded portion for folding the stacked first sheet and second sheet together from the upper side to the lower side in the up-down direction is provided at the upper end portion of the waist member.

[0057] According to the pants-type absorbent article of embodiment 11, when the waist member is viewed in the thickness direction, a portion where four sheet members are stacked is formed at the upper end portion. Therefore, the strength at the upper end portion of the waist member is locally increased, and when the waist member is pulled upward by grasping the upper end portion, it is easy to suppress the waist member from breaking or excessively stretching.

[0058] (Method 12)

[0059] The pants-type absorbent article according to aspect 11 is characterized in that, in the folded-back portion, at least a portion of the first sheet and the second sheet are joined to each other by the welded portion.

[0060] According to the pants-type absorbent article of embodiment 12, the first sheet and the second sheet are easily integrated at the folded portion, and the strength is further improved. Thus, when the waist member is pulled, the two sheet members are prevented from peeling off or only one of them is broken, and the wearability can be further improved.

[0061] (Method 13)

[0062] A shorts-type absorbent article as described in any one of methods 6 to 12, characterized in that the shorts-type absorbent article has a belt member arranged on the non-skin side of the waist member, and in the up-down direction and the left-right direction, at least a portion of the welding portion joining the first sheet and the second sheet overlaps with a portion of the belt member.

[0063] According to the pants-type absorbent article of embodiment 13, when the waist member is viewed in the thickness direction, the waist member has a higher rigidity in the portion where the belt member overlaps with the welded portion than in the portion where the belt member does not overlap. As a result, when the waist member is pulled during wearing, excessive elongation or breakage of the waist member can be suppressed, and wearability can be improved.

[0064] (Method 14)

[0065] A shorts-type absorbent article, which has mutually intersecting up-down, left-right and front-back directions, and has an absorbent body with an absorbent core having liquid absorbency and a waist member, characterized in that at least one side of the above-mentioned front-back direction of the above-mentioned waist member has: a first elastic member, which is arranged at a position that does not overlap with the above-mentioned absorbent core in the above-mentioned up-down direction and can be stretched and contracted in the above-mentioned left-right direction; and a second elastic member, which is arranged on the lower side of the above-mentioned up-down direction compared with the above-mentioned first elastic member, can be stretched and contracted in the above-mentioned left-right direction, and has a curved portion that curves from the outside to the inside in the above-mentioned left-right direction and from the upper side to the lower side in the above-mentioned up-down direction, and in the above-mentioned left-right direction, in the area between the end of one side and the end of the other side of the above-mentioned waist member, the total length of the mounting mechanism for mounting the above-mentioned first elastic member on the above-mentioned waist member is less than the total length of the mounting mechanism for mounting the above-mentioned second elastic member on the above-mentioned waist member.

[0066] According to the shorts-type absorbent article of mode 14, the length of the mounting mechanism of the second elastic member is relatively long, and it is difficult to stretch excessively. Therefore, the force of pulling the waist member upward during wearing is easy to act on the absorbent core. Therefore, the absorbent core can be easily matched to the crotch of the wearer. In addition, the length of the mounting mechanism of the first elastic member is relatively short, and thus, the rigidity of the waist member can be suppressed from becoming excessively high. Thus, the wearability of the absorbent core can be improved, and a good skin touch can be easily achieved.

[0067] (Method 15)

[0068] The shorts-type absorbent article as described in mode 14 is characterized in that the second elastic member has a low-stretch region with lower stretchability than other regions in at least a portion of the region overlapping with the absorbent core in the left-right direction, and in an area farther outside in the left-right direction than the low-stretch region, a total length of a mounting mechanism for mounting the first elastic member on the waist member is smaller than a total length of a mounting mechanism for mounting the second elastic member on the waist member.

[0069] According to the shorts-type absorbent article of embodiment 15, the curved portions are easily and firmly fixed to the waist member on both sides of the absorbent core in the left-right direction, and the force is easily transmitted in the up-down direction (direction intersecting the left-right direction). Therefore, when the waist member is pulled upward, the force of pulling the waist member is more likely to act on the absorbent core, and the wearability of the absorbent core 11 can be further improved.

[0070] (Method 16)

[0071] The pants-type absorbent article according to aspect 14 or 15 is characterized in that the second elastic member is attached to the waist member by the attachment mechanism using an adhesive.

[0072] According to the shorts type absorbent article of embodiment 16, since the waist member and the second elastic member have a high degree of integrity, the second elastic member and the waist member can be linked together during the wearing action, and the absorbent core can be pulled up more easily. In addition, the second elastic member can be fixed along a desired path by using a mounting mechanism using an adhesive, so that the degree of freedom of design is improved, and even in the case of having a curved portion intersecting the left and right directions, elasticity can be freely given to the waist member.

[0073] (Method 17)

[0074] A shorts-type absorbent article as described in any one of methods 14 to 16, characterized in that the waist member has a first sheet and a second sheet stacked on the non-skin side compared to the first sheet, the first sheet and the second sheet are joined to each other by means of a plurality of scattered welds, and the first elastic member is mounted on the waist member by being sandwiched between two adjacent welds in the up and down direction.

[0075] According to the shorts-type absorbent article of embodiment 17, the welded portions where the first sheet and the second sheet are joined are formed discretely, and the first elastic member can be attached by utilizing the welded portions, so that the softness and elasticity of the waist member can be easily maintained. In addition, the first sheet and the second sheet are joined by the welded portions, so that the joining strength of the waist member can be easily ensured, and even if the waist member is pulled during wearing, the waist member is unlikely to be broken or the sheets are unlikely to be separated from each other.

[0076] ===Implementation Method===

[0077] As an example of the pants-type absorbent article according to the embodiment of the present invention, a pants-type diaper 1 (hereinafter also simply referred to as "diaper 1") will be described. The pants-type absorbent article also includes pants-type sanitary napkins and pants-type absorbent pads.

[0078] <Basic Structure of Diaper 1>

[0079] Figure 1 This is a schematic perspective view showing a configuration example of the diaper 1 according to the present embodiment. Figure 2 This is a schematic plan view of the diaper 1 in the unfolded and stretched state as viewed from the skin side in the thickness direction. Figure 3 yes Figure 2 Schematic diagram of the A-A section.

[0080] The "stretched state" of the diaper 1 refers to a state in which the diaper 1 as a whole (the entire product) is stretched without wrinkles by stretching the elastic members (e.g., the waist elastic members 25 and the leg elastic members 27 described later) of the diaper 1. Specifically, it refers to a state in which the dimensions of the components constituting the diaper 1 (e.g., the absorbent body 10 and the waist member 20 described later) are stretched to the same or similar dimensions as the dimensions of the components alone. On the other hand, with respect to the stretched state, Figure 1 Such a state is called the natural state. The "natural state" refers to the state after the diaper 1 is left for a predetermined time. For example, the waist member 20 of the diaper 1 is pulled to both sides in the left and right directions to set it to the "stretched state", and the stretched state is maintained for 15 seconds, and then the diaper 1 is released from the pulling and placed on a flat surface such as a table. And the state after 5 minutes of being placed flat on such a flat surface is called the natural state.

[0081] Diapers 1 in Figure 1 In the shorts-type state shown, the "up-down direction", "left-right direction" and "front-back direction" are mutually orthogonal. Figure 3 As shown in FIG. 1 , there is a "thickness direction" which is the direction in which each member is stacked. In the up-down direction, the side that becomes the waist side of the wearer when the wearer wears the diaper 1 is set as the "upper side", and the side that becomes the crotch side of the wearer is set as the "lower side". In addition, in the front-back direction, the side that becomes the abdominal side of the wearer when the wearer wears is set as the "front side", and the side that becomes the back side of the wearer is set as the "back side". In addition, in the thickness direction, the side that contacts the skin of the wearer when the wearer wears the diaper 1 is set as the "skin side", and the opposite side is set as the "non-skin side".

[0082] In addition, diaper 1 Figure 2In the unfolded state shown, the pants have a "longitudinal direction" and a "lateral direction" that are orthogonal to each other. The "longitudinal direction" is a direction along the up-down direction of the pants type, and the "lateral direction" is a direction along the left-right direction of the pants type.

[0083] The diaper 1 of this embodiment includes a liquid-absorbent main body 10 that absorbs liquid such as urine, and a waist member 20 that is joined to the non-skin side of the absorbent main body 10 and is disposed around the waist of the wearer when the diaper 1 is worn.

[0084] (Absorbent body 10)

[0085] Figure 4 1 is a top view and a cross-sectional view of the absorbent body 10. Figure 2 As shown in FIG. 1 , the longitudinal direction (i.e., the long side direction of the absorbent body 10) is a generally rectangular shape when viewed from above along the vertical direction of the diaper 1. Figure 3 as well as Figure 4 As shown, the absorbent body 10 has: an absorbent core 11 along the longitudinal direction (up and down direction); a top sheet 12 arranged on the skin side relative to the absorbent core 11; a bottom sheet 13 arranged on the non-skin side relative to the absorbent core 11; and a pair of side sheets 15, 15 arranged on both sides of the absorbent core 11 in the lateral direction (left and right direction).

[0086] The absorbent core 11 is a member for absorbing and retaining excretions such as urine, and can be, for example, a member formed into a predetermined shape by forming liquid-absorbent fibers such as pulp containing a superabsorbent polymer (SAP). Figure 4 As shown in the figure, the absorbent core 11 is formed in a substantially hourglass shape with the longitudinal central portion narrowing inwardly in the left-right direction, but the shape of the absorbent core 11 is not limited thereto. In addition, the outer peripheral surface of the absorbent core 11 may also be covered by a liquid-permeable sheet member (core wrap sheet 11b) such as tissue paper.

[0087] The top sheet 12 is a liquid-permeable sheet member that can come into contact with the wearer's skin when worn, and is formed of, for example, a hydrophilic air-through nonwoven fabric or a spunbond nonwoven fabric. Figure 4 In the cross-sectional view of , the left and right ends of the top sheet 12 are configured in a manner that is folded into the non-skin side compared to the absorbent core 11, and the top sheet 12 becomes a structure that wraps the absorbent core 11 from the skin side. In addition, a secondary sheet not shown in the figure may be provided between the top sheet 12 and the absorbent core 11.

[0088] The back sheet 13 is a liquid-impermeable and breathable sheet member (breathable sheet member) for preventing liquid such as urine absorbed by the absorbent core 11 from leaking to the outside, and is formed of a liquid-impermeable film such as polyethylene or polypropylene.

[0089] The side sheets 15 are sheet members disposed on both sides of the absorbent core 11 in the lateral direction, and hydrophobic nonwoven fabrics such as SMS (spunbond-meltblown-spunbond) nonwoven fabrics may be used, for example. One end side of the side sheet 15 in the up-down direction (left-right direction) is bent so as to be located closer to the non-skin side than the absorbent core 11 and the back sheet 13. On the other hand, the other end side of the side sheet 15 in the up-down direction (left-right direction) is bent so as to be located closer to the skin side than the absorbent core 11 and the top sheet 12, forming a pair of leak-proof wall portions 30, 30 on both sides of the absorbent body 10.

[0090] The leakage-proof wall portions 30 are provided in pairs on both sides of the absorbent body 10 in the lateral direction (left-right direction), and are portions equivalent to so-called three-dimensional gathers. When the diaper 1 is worn, the leakage-proof wall portions 30 stand up on both sides of the absorbent body 10 in the left-right direction toward the skin side of the wearer, thereby preventing excretion fluids such as urine from flowing along the wearer's skin and leaking outward in the left-right direction of the absorbent body 10. In addition, the leakage-proof wall portions 30 may be respectively composed of two or more sheet members (side sheets 15).

[0091] like Figure 4 As shown in the cross-sectional view of FIG. 1 , in the side panels 15, at the end 15t of the portion bent toward the skin side in the thickness direction, the side panels 15 are folded back multiple times, thereby becoming a state of being stacked in the thickness direction, and the leakage-proof wall elastic member 35 is provided in a state of being stretched in the longitudinal direction between the stacked side panels 15. When the diaper 1 is worn, based on the elasticity of the leakage-proof wall elastic member 35, the end 15t of the leakage-proof wall portion 30 shrinks in the longitudinal direction (up and down direction), so that the absorbent body 10 is easily matched along the leg circumference of the wearer.

[0092] (Waist member 20)

[0093] The waist member 20 is a sheet member disposed on the non-skin side of the absorbent body 10, and includes a skin side sheet 21, non-skin side sheets 22, 23, and a cover sheet 24. Figure 2 As shown in FIG. 1 , the waist member 20 is formed at the front side ( Figure 1 The portion of the waist member 20 which is located at the front side of the front-to-back direction and overlaps with the side joint 40 (described later) is defined as the "front waist portion FA". Similarly, the waist member 20 is formed at the rear side ( Figure 1 The portion that is located at the rear side of the front-to-back direction in the front-to-back direction and overlaps with the side joint 40 is defined as the "rear waistline portion BA". In addition, the portion between the rear end of the front waistline portion FA and the front end of the rear waistline portion BA in the longitudinal direction is defined as the "crotch portion CA".

[0094] The skin side sheet 21 is a sheet member disposed on the skin side of the waist member 20, and is formed of, for example, a spunbonded nonwoven fabric or an SMS nonwoven fabric. Figure 2 As shown, the skin side sheet 21 is continuously formed from the front side (ventral side) to the rear side (dorsal side) in the longitudinal direction, and has a shape that narrows inwardly in the crotch portion CA. The narrowed portion becomes the leg opening 1b (described later) of the diaper 1 in the shape of shorts.

[0095] The non-skin side sheet 22 is a sheet member stacked on the non-skin side of the skin side sheet 21 on the front side (ventral side) in the longitudinal direction, and is formed of a spunbond nonwoven fabric or an SMS nonwoven fabric, etc., similarly to the skin side sheet 21. The skin side sheet 21 and the non-skin side sheet 22 are joined to each other in a state of being stacked in the thickness direction using a plurality of welded portions 50, 50... described later. In addition, a plurality of waist elastic members 25, 25... are provided between the skin side sheet 21 and the non-skin side sheet 22. The plurality of waist elastic members 25, 25... are arranged at intervals in the longitudinal direction (up and down direction), and are respectively installed between the skin side sheet 21 and the non-skin side sheet 22 in a state of being stretched in the transverse direction (left and right direction). As a result, the waist elastic member 25 exhibits elasticity in the transverse direction (left and right direction), and through this elasticity, elasticity is imparted to the front waist portion FA of the waist member 20.

[0096] As an example, the waist elastic member 25 may be formed of an elastic resin material having a thermoplastic elastic resin as a main component and molded into a rubber thread. As the above-mentioned thermoplastic elastic resin, for example, a thermoplastic resin showing rubber elasticity at room temperature is preferred, and for example, the thermoplastic elastomer described in JIS K6418:2007 can be cited. The above-mentioned thermoplastic elastic resin is preferably a material having an elastic deformation temperature range of about 100°C or less. As the above-mentioned thermoplastic elastic resin, for example, olefin elastomers (for example, VERSIFY (trademark) of The Dow Chemical Company), propylene elastomers (for example, Vistamaxx (trademark) of Exxon Mobil), styrene elastomers (for example, Quintac (trademark) of Zeon Corporation of Japan) and the like can be cited.

[0097] The non-skin side sheet 23 is a sheet member stacked on the non-skin side of the skin side sheet 21 on the rear side (back side) in the longitudinal direction, and has the same structure as the non-skin side sheet 22. That is, the non-skin side sheet 23 is joined to the skin side sheet 21 by a plurality of welded portions 50, 50..., and a plurality of waist elastic members 25, 25... are provided between the skin side sheet 21 and the non-skin side sheet 23 so as to be stretchable in the transverse direction (left-right direction).

[0098] The cover sheet 24 is a sheet member which is laminated on the non-skin side of the skin side sheet 21 on the rear side (back side) in the longitudinal direction, similarly to the non-skin side sheet 23. Figure 3As shown, it is located at a position lower than the non-skin side sheet 23 in the up-down direction (front side in the longitudinal direction), and a part is overlapped with the non-skin side sheet 23. Hereinafter, the part where the cover sheet 24 overlaps with the non-skin side sheet 23 in the up-down direction (longitudinal direction) is also referred to as "back overlapping portion LB".

[0099] The cover sheet 24 is bonded to the skin side sheet 21 and a portion of the non-skin side sheet 23 via an adhesive surface 75 made of an adhesive such as a hot melt adhesive. In addition, a leg elastic member 27 made of rubber thread or the like is provided between the cover sheet 24 and the skin side sheet 21 in the thickness direction (see Figure 3 The leg elastic member 27 has: a straight portion 27a in which the portion overlapping with the absorbent body 10 (absorbent core 11) is arranged in a straight line along the horizontal direction in the central portion in the horizontal direction (left-right direction); and a curved portion 27b in which the two sides in the horizontal direction are arranged in a curved manner along the contour of the leg opening 1b. Due to the elasticity of the leg elastic member 27, the leg opening 1b is easily matched along the leg circumference of the wearer on the back side when the diaper 1 is worn, and the portion of the waist member 20 covering the wearer's buttocks is difficult to roll up.

[0100] In addition, the waist member 20 has the skin side sheet 21 and the non-skin side sheets 22 and 23 partially folded back downward at the upper end in the vertical direction. Figure 3 In the embodiment, the skin side sheet 21 and the non-skin side sheet 22 form a front folded portion 20Ff which is a portion folded back toward the lower side in the vertical direction and the skin side in the thickness direction at the front folded position FL20f located at the front upper end of the waist member 20. The front folded portion 20Ff is bonded to the sheet member ( Figure 3 At least a portion of the skin side sheet 21 and the top sheet 12 of the absorbent body 10 are joined to each other.

[0101] Likewise, in Figure 3 In the embodiment, the skin side sheet 21 and the non-skin side sheet 23 form a rear folded portion 20Fb which is a portion folded back toward the lower side (the front side in the longitudinal direction) and the skin side in the thickness direction at the rear folded position FL20b located at the rear upper end of the waist member 20. The rear folded portion 20Fb is bonded to the sheet member ( Figure 3 At least a portion of the skin side sheet 21 and the top sheet 12 of the absorbent body 10 are joined to each other.

[0102] In the diaper 1, the front folded portion 20Ff may be formed by folding back only one sheet member of the skin side sheet 21 and the non-skin side sheet 22 at the front folded position FL20f. Similarly, the rear folded portion 20Fb may be formed by folding back only one sheet member of the skin side sheet 21 and the non-skin side sheet 23 at the rear folded position FL20b. That is, the folded portions 20Ff and 20Fb may be formed by one sheet member, respectively.

[0103] Alternatively, a separate sheet member may be provided at a position closer to the skin side than the folded portions 20Ff and 20Fb. For example, the sheet member may be arranged so as to span from the skin side of the lower edge of the folded portions 20Ff and 20Fb in the vertical direction. Figure 3 (not shown in the figure), the lower end edges of the folded parts 20Ff and 20Fb are prevented from digging into the wearer's skin when the diaper 1 is worn.

[0104] Diapers 1 from Figure 2 From the unfolded state shown, the center position CL in the longitudinal direction ( Figure 2 The absorbent body 10 and the waist member 20 are folded in half in the longitudinal direction, with the waist member 20 (indicated by a single dotted line) as the folding position. In this folded state, the lateral sides 20fe, 20fe of the front waist portion FA and the lateral sides 20be, 20be of the rear waist portion BA in the waist member 20 overlapped in the front-to-back direction are joined by known joining means such as sealing welding to form a pair of side joints 40, 40. As a result, the folded waist member 20 is connected in a ring shape at the front side (ventral side) and the rear side (dorsal side), forming a waist member 20 having a waist shape of 1 / 2 and a waist shape of 1 / 2. Figure 1 The waist opening 1a and the pair of leg openings 1b as shown in the figure form a pants-type diaper 1.

[0105] <About the Installation of the Waist Elastic Member 25 and the Leg Elastic Member 27>

[0106] A specific method of attaching the waist elastic members 25 and the leg elastic members 27 to the waist member 20 will be described. First, the method of attaching the waist elastic members 25 will be described.

[0107] Figure 5 This is a diagram for explaining a range in which a plurality of welded portions 50 are formed in the waist member 20 . Figure 6 This is a diagram for explaining an example of the arrangement of the welded portion 50 . Fig. 7A as well as Figure 7B This is a diagram for explaining the principle of attaching the waist elastic member 25 to the waist member 20 using the welded portion 50 .

[0108] In the waist member 20 of the diaper 1, the skin side sheet 21 and the non-skin side sheets 22, 23 are joined by a plurality of welded portions 50, 50, etc. formed by a known welding means such as ultrasonic welding. Figure 5 In the manufacturing process of the diaper 1, when the non-skin side sheets 22 and 23 (equivalent to the second sheet) are joined to the non-skin side of the skin side sheet 21 (equivalent to the first sheet), the area where the welded portion 50 is formed is indicated by the oblique line portion. In addition, at the stage of joining the skin side sheet 21 and the non-skin side sheets 22 and 23, the leg opening 1b is not formed yet (the sheet member is not cut). In addition, Figure 5 In FIG. 1 , the position of the absorbent body 10 (absorbent core 11 ) is indicated by a dotted line, and the absorbent body 10 is not yet joined to the waist member 20 at the stage of forming the welded portion 50 .

[0109] like Figure 5 As shown in FIG. 2 , the skin side sheet 21 and the non-skin side non-skin side sheets 22 and 23 are joined in the thickness direction in the stretched state before being bent at the front bending position FL20f and the rear bending position FL20b, respectively. That is, the welded portion 50 is formed in the range spanning the front and rear bending positions FL20f and FL20b. Figure 5 Within the range indicated by the oblique line portion, between the skin side piece 21 (first piece) and the non-skin side pieces 22, 23 (second piece) facing each other in the thickness direction, a plurality of waist elastic components 25, 25... that can be stretched and contracted in the left and right directions are arranged and sandwiched at intervals in the up and down direction (longitudinal direction), and are installed based on the welding parts 50, 50...

[0110] In the waist member 20 of this embodiment, Figure 6 As shown in FIG. 1 , a plurality of welded portions 50, 50, ... are arranged at intervals in the vertical direction (longitudinal direction) to form a welded portion row 60 along the vertical direction, and a plurality of welded portion rows 60 are provided at intervals in the horizontal direction (lateral direction). Figure 6 In order to simplify the description, the configuration and number of the waist elastic member 25 and the welded parts 50 are schematically shown. Each welded part row 60 is configured to have a convex part 60P protruding to one side or the other side in the left-right direction. That is, by making the positions of the multiple welded parts 50 contained in the welded part row 60 different in the left-right direction, the welded part row 60 is formed in a manner having concave and convex as a whole. Figure 6 In the example of FIG. 5 , the welded portion row 60 is formed in a manner that meanders from the upper side to the lower side in the vertical direction. However, the arrangement of each welded portion 50 is not limited to Figure 6 For example, the welded portion row 60 may have the convex portion 60P only on one side in the left-right direction. In addition, the welded portion row 60 may not have concavities and convexities in the left-right direction but may be arranged straightly in the up-down direction.

[0111] The waist elastic member 25 is attached to the waist member 20 by sandwiching the waist elastic member 25 from top to bottom by two welds 50, 50 adjacent to each other in the vertical direction among the plurality of welds 50, 50 ... included in the weld row 60. That is, a pair of welds 50, 50 arranged on both sides of the waist elastic member 25 in the vertical direction constitute a weld pair 50s, and the waist elastic member 25 is attached by using the weld pair 50s.

[0112] like Fig. 7A As shown, a pair of welds 50, 50 constituting the weld 50s are arranged at an interval GH50 in the vertical direction. And, the size of the interval GH50 is set to be the same size as the outer diameter D25t of the waist elastic member 25 such as the rubber thread under the state of the target elongation ratio in the left and right directions or a slightly larger size (GH50≥D25t) than it. That is, the waist elastic member 25 in the stretched state is configured between the weld 50s in the vertical direction. If such a structure, then in the manufacturing process of diaper 1, after the waist elastic member 25 in the stretched state is configured between the skin side sheet 21 and the non-skin side sheet 22 (23), when the skin side sheet 21 and the non-skin side sheet 22 (23) are joined, the weld 50 can be formed without overlapping with the waist elastic member 25. Here, the “extension ratio” refers to a value R (= L1 / L0 ) indicating how many times the total length L1 of the waist elastic member 25 is stretched to the total length L0 in the unloaded state, which is the natural length.

[0113] Furthermore, if the waist elastic member 25 relaxes from the stretched state, Figure 7B As shown in the figure, the waist elastic member 25 shrinks in the left-right direction and expands in the vertical direction, and the expanded outer diameter D25t' is larger than the vertical interval GH50 of the welding portion pair 50s (D25t'>GH50). Therefore, the vertical expansion of the waist elastic member 25 is restricted between the welding portions 50s, and thus, the waist elastic member 25 is substantially clamped in the vertical direction by the welding portions 50, 50. As a result, the position of the waist elastic member 25 in the vertical direction and the left-right direction is restricted by the welding portion pair 50s, and the waist elastic member 25 is elastically mounted on the waist member 20, giving the waist member 20 elasticity in the left-right direction.

[0114] In addition, in the shorts-type diaper 1, since the waist elastic member 25 is joined to the left and right ends of the waist member 20 by the side joints 40, even if the waist member 20 stretches in the left and right directions when the diaper 1 is worn, the waist elastic member 25 will not be detached from the waist member 20.

[0115] Next, a method of attaching the leg elastic members 27 will be described. Figure 8 2 is a diagram for explaining the range of the adhesive portion 70 formed in the waist member 20 for attaching the leg elastic member 27. Figure 8 The following figure shows the process of manufacturing the diaper 1 after the skin side sheet 21 and the non-skin side sheet 22 (23) are joined by the welded portion 50 (see FIG. Figure 5 ) status.

[0116] The adhesive portion 70 is formed by applying an adhesive such as a hot melt adhesive to a predetermined area of ​​the non-skin side of the skin side sheet 21. Figure 8 In the embodiment, an adhesive is applied to a plurality of rectangular regions indicated by oblique lines along the region where the leg elastic member 27 is arranged, thereby forming an adhesive portion 70. In the skin side sheet 21 where the adhesive portion 70 is formed, Figure 8 The leg elastic component 27 is configured in a longitudinal (up and down direction) and transverse (left and right direction) stretched state, and then the cover piece 24 (equivalent to the third piece) is covered from its non-skin side and sandwiched, thereby installing the leg elastic component 27 on the waist component 20.

[0117] In addition, on the skin side of the cover sheet 24, an adhesive surface 75 is formed by applying an adhesive in advance (see Figure 3 ), the facing surfaces of the skin side sheet 21 (and a portion of the non-skin side sheet 23) and the cover sheet 24 are firmly bonded to each other via the bonding surface 75.

[0118] Alternatively, after forming the adhesive portion 70 on the cover sheet 24 side and attaching the leg elastic members 27 , the cover sheet 24 to which the leg elastic members 27 are attached may be joined to the non-skin side of the skin side sheet 21 .

[0119] By fixing substantially the entire region of the leg elastic member 27 with the adhesive portion 70, the shapes of the straight portion 27a and the curved portion 27b of the leg elastic member 27 can be maintained, and stretchability can be easily achieved along the contour of the leg opening 1b.

[0120] <Effects of the waist elastic members 25 and the leg elastic members 27>

[0121] In conventional underpants-type diapers, a plurality of elastic members are attached to the waist member using the same attachment mechanism. For example, in conventional underpants-type diapers having waist elastic members 25 and leg elastic members 27 similar to the diaper 1, the elastic members 25 and 27 are generally attached to the waist member using the same adhesive pattern (attachment mechanism) using adhesives or the like. In this case, there is a possibility that problems may arise in terms of wearability of the diaper, etc., depending on the length of the portion where the elastic members 25 and 27 are attached.

[0122] For example, if the length of the installation part of the elastic member configured in the area not overlapping with the absorbent core when viewed in the thickness direction is long, the waist member becomes hard in the area where the elastic member is installed, and there is a possibility that the skin touch when wearing it will deteriorate. On the other hand, if the length of the installation part of the elastic member configured in the area overlapping with the absorbent core when viewed in the thickness direction is short, when the waist member is pulled up from the toe side of the wearer toward the crotch side when wearing the diaper 1, the elastic member is easy to stretch, and sometimes the pulling force will be difficult to act on the absorbent core. In this case, the absorbent core is difficult to pull up or difficult to match with the crotch part, and there is a possibility that the wearability will deteriorate.

[0123] In contrast, in the diaper 1 of the present embodiment, Figures 5 to 8 As described above, the waist elastic members 25 and the leg elastic members 27 are attached to the waist member 20 by different attachment mechanisms (weld portions 50, adhesive portions 70). This improves the wearing properties and the touch when the diaper 1 is worn.

[0124] Fig. 9 1 is a top view illustrating the state of the rear side of the diaper 1 in the stretched state. Figure 2 In the region (behind the center position CL in the longitudinal direction), one of the elastic members arranged in the region that does not overlap with the absorbent core 11 in the vertical direction (longitudinal direction) is defined as the first elastic member E1. Fig. 9 In the embodiment, the elastic member indicated by the thick dotted line among the waist elastic members 25 that do not overlap with the absorbent core 11 is defined as the first elastic member E1. In addition, one of the elastic members arranged in the region overlapping with the absorbent core 11 in the up-down direction (longitudinal direction) is defined as the second elastic member E2. Fig. 9 In FIG. 1 , the elastic member indicated by the thick dotted line among the leg elastic members 27 overlapping the absorbent core 11 is referred to as the second elastic member E2 .

[0125] In the diaper 1 of the present embodiment, in the left-right direction (lateral direction), the total length in the left-right direction of the mounting mechanism (i.e., the welded portion 50) for mounting the first elastic member E1 on the waist member 20 in the region W11 overlapping with the absorbent core 11 is smaller than the total length in the left-right direction of the mounting mechanism (i.e., the adhesive portion 70) for mounting the second elastic member E2 on the waist member 20 in the region W11 overlapping with the absorbent core 11. In addition, the “region overlapping with the absorbent core 11” refers to the range of the maximum width of the absorbent core 11 in the left-right direction ( Fig. 9 range represented by W11 in the figure).

[0126] Specifically, in the area W11 overlapping with the absorbent core 11 in the left-right direction, the first elastic member E1 (waist elastic member 25) is installed using n pairs of welded portions 50s arranged in the left-right direction. When the length of each pair of welded portions 50s in the left-right direction is set to W50s (refer to FIG. 7 ), the total length in the left-right direction of the installation mechanism for installing the first elastic member E1 is expressed as "n×W50s". In addition, in the area W11 overlapping with the absorbent core 11 in the left-right direction, the second elastic member E2 (leg elastic member 27) is installed using a continuous adhesive portion 70 in the left-right direction. When the length of the adhesive portion 70 in the left-right direction is set to W70 (refer to FIG. Figure 8 ), the total length in the left-right direction of the mounting mechanism for mounting the second elastic member E2 is represented by "W70". Furthermore, the total length of the mounting mechanism for the first elastic member E1 (n×W50s) < the total length of the mounting mechanism for the second elastic member E2 (W70).

[0127] In the case where the total length of the mounting mechanism of the first elastic member E1 (n×W50s) is less than the total length of the mounting mechanism of the second elastic member E2 (W70), the total length of the mounting mechanism of the second elastic member E2 (adhesive portion 70) is relatively long. Therefore, compared with the opposite case, the second elastic member E2 is firmly fixed to the waist member 20 and is difficult to be overstretched. When the waist member 20 is pulled upward during the wearing action of the diaper 1, the force pulling the waist member 20 is easy to act on the absorbent core 11. That is, the force pulling the waist member 20 is more likely to be used to pull up the absorbent core 11 than to be used to stretch the second elastic member E2. As a result, the absorbent core 11 can be easily matched with the crotch of the wearer. Furthermore, when the diaper 1 is worn, the highly rigid absorbent core 11 is easily pressed toward the wearer's skin due to the stretchability of the second elastic member E2, so that the absorbent core 11 is less likely to shift in position, and the close fit to the body can be improved.

[0128] Furthermore, since the total length of the attachment mechanism (welded portion 50) of the first elastic member E1 is relatively short, it is possible to suppress the rigidity of the waist member 20 from becoming excessively high compared to the opposite case.

[0129] As a result, the softness of the waist member 20 is improved, the matching property is improved, and the skin touch when wearing can be made softer. In particular, in the area not overlapping with the absorbent core 11, the skin side of the waist member 20 is in direct contact with the wearer's skin when the diaper 1 is worn, so the softness of this area has a greater impact on the skin touch.

[0130] Thus, when the diaper 1 is worn, the wearability of the absorbent core 11 can be improved, and a good skin feel can be easily achieved. Fig. 9 In the case where a part of the waist elastic member 25 is arranged at a position overlapping with the absorbent core 11 in the up-down direction (longitudinal direction), the waist elastic member 25 may be defined as the second elastic member E2.

[0131] In addition, in the waist member 20 of the diaper 1, a part of the second elastic member E2 (leg elastic member 27) is arranged in a direction intersecting the left-right direction. That is, the leg elastic member 27 is arranged along the inclined direction at the curved portion 27b, and the stress applied by the leg elastic member 27 includes a component along the vertical direction. Therefore, when the diaper 1 is worn, if the waist member 20 is pulled upward in the vertical direction, the absorbent core 11 is easily pulled upward by the contraction force including the vertical direction component that appears at the curved portion 27b of the leg elastic member 27. As a result, the absorbent core 11 is more easily pulled up, which can improve the wearability.

[0132] Furthermore, the second elastic member E2 (leg elastic member 27) is attached to the waist member 20 in its entirety in the longitudinal direction by an attachment mechanism (adhesive portion 70) using an adhesive such as a hot melt adhesive. Therefore, compared with the case where the waist elastic member 25 is attached to the waist member 20 by limiting the movement in the up-down direction and the left-right direction by using the scattered welded portion pairs 50s, the integrity of the waist member 20 and the leg elastic member 27 is further improved. Thus, when the diaper 1 is worn, the second elastic member E2 (leg elastic member 27) and the waist member 20 are linked to each other, and the absorbent core 11 can be pulled up more easily. In addition, by using the adhesive portion 70, the leg elastic member 27 can be fixed along a desired path, so that the degree of freedom of design is improved, and even in the case where a portion intersecting the left-right direction is included, such as the curved portion 27b, it is easy to freely give elasticity to the waist member 20.

[0133] In addition, the second elastic member E2 (leg elastic member 27) is attached to the waist member 20 by the above-mentioned attachment mechanism (adhesive portion 70) using an adhesive in an area outside the absorbent core 11 in the left-right direction (lateral direction). When the diaper 1 is worn, when the waist member 20 is pulled up, it is necessary to stretch the waist member 20 to both sides in the left-right direction so that the legs can pass through. At this time, the second elastic member E2 and the waist member 20 are integrated by the adhesive portion 70 at a position outside the absorbent core 11 in the left-right direction, thereby making it easy for the force that pulls and pulls up the waist member 20 in the left-right direction to act on the absorbent core 11. If the second elastic member E2 and the waist member 20 have low integration at a position outside the absorbent core 11 in the left-right direction, when the waist member 20 is pulled in the left-right direction, the pulling force is easy to act to stretch the second elastic member E2, and there is a possibility that the pulling force is difficult to act on the absorbent core 11. On the other hand, in the diaper 1 of this embodiment, it is easy to effectively act on the absorbent core 11 via the second elastic member E2, and the absorbent core 11 can be pulled up more easily.

[0134] Furthermore, the second elastic member E2 (leg elastic member 27) is attached to the waist member 20 by means of an attachment mechanism (adhesive portion 70) using an adhesive in a region outside the absorbent core 11 in the left-right direction (lateral direction) and along the contour of a pair of leg openings 1b, 1b. When the diaper 1 is worn, the waist member 20 and the absorbent body 10 are pulled up after the wearer's legs are passed through the leg openings 1b. At this time, due to the friction generated between the leg openings 1b and the wearer's legs, it is sometimes difficult to pull up the waist member 20. In contrast, in this embodiment, since the second elastic member E2 is integrally provided with the waist member 20 along the contour of the leg openings 1b, it is easy to make the force for pulling up the waist member 20 also act on the leg openings 1b. Therefore, the leg openings 1b can be prevented from being hooked on the wearer's legs against the friction. As a result, it is easier to pull up the waist member 20 and the absorbent core 11.

[0135] In addition, the skin side sheet 21 (first sheet) and the non-skin side sheets 22, 23 (second sheet) are joined by a plurality of scattered welding sections 50, 50... between the first sheet and the second sheet in the thickness direction, and the waist elastic member 25 (first elastic member E1) is installed by sandwiching it from top to bottom by a pair of welding sections 50s. That is, the welding sections 50 that join the first sheet and the second sheet can be formed in a dispersed manner and the waist elastic member 25 can be installed, so it is easy to maintain the softness and elasticity of the waist member 20 compared with the case of fixing it by the adhesive section 70. In addition, the first sheet and the second sheet are joined by welding means such as ultrasonic welding over a wide range, so it is easy to ensure the joining strength of the waist member 20, and even if the waist member 20 is pulled up during the wearing action of the diaper 1, it is also possible to suppress the waist member 20 from breaking or the sheets from peeling off from each other. This makes it easy to maintain the flexibility of the waist member 20 and ensure its strength.

[0136] In addition, a plurality of waist elastic members 25 (first elastic members E1) are provided at intervals in the vertical direction, and between two waist elastic members 25, 25 adjacent to each other in the vertical direction, one or more welded portions 50 (see FIG. 5 ) which are not in contact with the waist elastic members 25 are provided. Figure 6 ). That is, a welding portion 50 is provided which does not have the function of sandwiching and installing the first elastic member E1 above and below, but is only used to join the skin side sheet 21 (first sheet) and the non-skin side sheets 22, 23 (second sheet). In this way, by providing the welding portion 50 also in the portion that does not contribute to the installation of the first elastic member E1, the joining strength of the first sheet and the second sheet constituting the waist member 20 is further improved. Therefore, even if the waist member 20 is pulled during the wearing action of the diaper 1, it is easier to suppress the waist member 20 from breaking.

[0137] In addition, a cover sheet 24 (third sheet) is provided on the back side of the waist member 20 in the front-back direction so as to sandwich the leg elastic member 27 (second elastic member E2) between the skin side sheet 21 (first sheet). In addition, in the up-down direction, the non-skin side sheet 23 (second sheet) and the cover sheet 24 (third sheet) have a back overlapping portion LB overlapping each other (see FIG. Figure 3 ). Therefore, at least three layers of sheet members (21, 23, 24) are stacked in the thickness direction in the back overlapping portion LB, and the strength is higher than other parts of the waist member 20. As a result, when the waist member 20 is pulled up during the wearing action of the diaper 1, it is easy to prevent the waist member 20 from breaking. In particular, the back side of the waist member 20 has a larger area than the front side, and when pulled up, it is easy to increase the resistance when it contacts the wearer's skin. Therefore, by increasing the strength of the back overlapping portion LB, it is easier to prevent the waist member 20 from breaking.

[0138] Furthermore, the waist member 20 has a portion where the skin side sheet 21 (first sheet), the non-skin side sheet 23 (second sheet), and the cover sheet 24 (third sheet) are joined to each other in the back overlapping portion LB. Figure 3 In the embodiment, the skin side sheet 21 (the first sheet) and the non-skin side sheet 23 (the second sheet) are joined via the welding section 50, and the non-skin side sheet 23 (the second sheet) and the cover sheet 24 (the third sheet) are joined via the bonding surface 75. Moreover, in the vertical direction, the welding section 50 and the bonding surface 75 at least partially overlap. Thus, the first to third sheets are easily integrated, and the strength of the back overlapping section LB can be further improved. Therefore, it is easy to suppress the waist member 20 from breaking, etc.

[0139] In addition, at least a portion of the welded portion row 60 formed by arranging a plurality of welded portions 50, 50, ... at intervals in the vertical direction is arranged so as to straddle the end portion of the absorbent body 10 in the horizontal direction. Figure 6 In the embodiment, a welding portion row 60 is arranged at a position overlapping with the two side ends 10es, 10es of the absorbent body 10 in the left-right direction. As a result, the strength of the portion overlapping with the two side ends 10es, 10es of the absorbent body 10 in the waist member 20 is improved. The absorbent body 10 and the waist member 20 are bonded to each other using a hot melt adhesive or the like. Therefore, when the waist member 20 is pulled during the wearing action of the diaper 1, stress is concentrated on the boundary portion with the absorbent body 10 (i.e., the two side ends 10es, 10es of the absorbent body 10), and there is a possibility that the waist member 20 is easily broken. In contrast, in the present embodiment, by forming the welding portion row 60 in a manner spanning the boundary portion (the two side ends 10es) in the left-right direction, the strength of the waist member 20 at the boundary portion can be strengthened, and the durability of the waist member 20 can be improved.

[0140] In addition, since the welded portion row 60 is formed along the vertical direction, it is arranged so as to span the upper end portion of the absorbent body 10 in the vertical direction (see Figure 6 ). Therefore, the strength of the waist member 20 can be reinforced also in the portion overlapping with the upper end of the absorbent body 10, and the durability of the waist member 20 can be further improved.

[0141] In addition, at the upper end of the waist member 20, there are provided folded back portions 20Ff and 20Fb (see FIG. 2 ) which are folded back from the upper side to the lower side in a state where the skin side sheet 21 (first sheet) and the non-skin side sheets 22 and 23 (second sheet) are stacked. Figure 3As a result, when the waist member 20 is viewed in the thickness direction, a portion where four layers of sheet members are stacked is formed. When the diaper 1 is worn, the wearer often pulls up the upper end of the waist member 20 with his hands. Therefore, by increasing the number of stacked sheet members at the upper end of the waist member 20, the strength is locally increased, and when the waist member 20 is pulled up by pulling the upper end, it is easy to prevent the waist member 20 from breaking or excessively stretching.

[0142] Furthermore, at least a portion of the stacked skin side sheet 21 (first sheet) and the non-skin side sheets 22, 23 (second sheet) are joined to each other at the folded portions 20Ff and 20Fb by the welded portions 50 (see FIG. Figure 3 ). Therefore, the first sheet and the second sheet are easily integrated at the folded parts 20Ff and 20Fb, and the strength becomes higher. Thus, when the waist member 20 is pulled, the two sheet members are prevented from peeling off or only one of them is broken, which can further improve the wearability.

[0143] <Modification>

[0144] The diaper 1 according to the present embodiment may be deformed as follows. Fig.10 1 is a schematic plan view of a modified example diaper 2 in an unfolded and stretched state. The modified example diaper 2 has a part of a structure of leg elastic members 27 that is different from that of the diaper 1. The other structures are basically the same as those of the diaper 1.

[0145] The leg elastic member 27 of the diaper 2 has a low stretch region in which a portion of the portion overlapping the absorbent core 11 in the central portion in the left-right direction has lower stretchability than other portions. Fig.10 In the figure, the portion indicated by the dotted line in the left-right central portion of the leg elastic member 27 is a low-elasticity region E1, and its elasticity is lower than that of the high-elasticity regions E2 indicated by the solid lines on both sides thereof.

[0146] In the low-elasticity region E1, the leg elastic member 27 is cut at multiple locations and is discontinuous in the left-right direction, so that the elasticity becomes low. In addition, the adhesive portion 70 may not be provided in the low-elasticity region E1 (see Figure 8 ), the leg elastic member 27 is cut off at a certain position in the low stretch area E1, and is contracted from the cut position toward both sides in the left and right directions, thereby reducing the stretchability (so-called reduction).

[0147] In the low stretch region E1, the stretchability of the leg elastic members 27 is weak, so the contraction force acting on the absorbent core 11 in the left-right direction is small. Therefore, the width of the absorbent core 11 is suppressed from being reduced when the diaper 2 is worn, and excrement is difficult to leak.

[0148] In addition, in the diaper 2 of the modified example, in the area from one end to the other end of the waist member 20 in the left-right direction, the total length in the left-right direction of the mounting mechanism (welding portion 50) for mounting the first elastic member E1 (waist elastic member 25) to the waist member 20 is smaller than the total length in the left-right direction of the mounting mechanism (adhesive portion 70) for mounting the second elastic member E2 (leg elastic member 27) to the waist member 20.

[0149] Thus, the total length of the mounting mechanism (adhesive portion 70) of the second elastic member E2 (leg elastic member 27) is relatively long, and the second elastic member E2 is easily and firmly fixed to the waist member 20, especially in the high-elasticity region EA2 (including the curved portion 27b) on both sides of the low-elasticity region EA1. Therefore, when the waist member 20 is pulled upward during the wearing action of the diaper 2, the force of pulling the waist member 20 is easily applied to the absorbent core 11. According to such a structure, in the diaper 2, the width of the absorbent core 11 can be suppressed from becoming smaller, and the absorbent core 11 can be easily matched to the crotch of the wearer.

[0150] On the other hand, since the total length of the attachment mechanism (welded portion 50) of the first elastic member E1 is relatively short, it is possible to suppress the rigidity of the waist member 20 from becoming excessively high compared to the opposite case.

[0151] This increases the flexibility of the waist member 20, improves the fit, and makes the feel to the skin softer when worn.

[0152] Furthermore, in the diaper 2, in the area from one end to the other end in the left-right direction of the waist member 20, the total length in the left-right direction of the mounting mechanism (welding portion 50) for mounting the first elastic member E1 (waist elastic member 25) to the waist member 20 is smaller than the total length in the left-right direction of the mounting mechanism (adhesive portion 70) for mounting the second elastic member E2 (leg elastic member 27) to the waist member 20 in the high stretch area EA2.

[0153] Since the total length of the mounting mechanism (adhesive portion 70) of the second elastic member E2 (leg elastic member 27) at the high elastic region EA2 is relatively long, the curved portion 27b is easily and firmly fixed to the waist member 20. Therefore, it is easier to transmit force in the up-down direction (direction intersecting the left-right direction) via the curved portion 27b of the high elastic region EA2. As a result, when the waist member 20 is pulled upward during the wearing action of the diaper 2, the force pulling the waist member 20 is more likely to act on the absorbent core 11. Therefore, the wearability of the absorbent core 11 can be further improved.

[0154] In addition, in the diaper 2, the second elastic member E2 (the leg elastic member 27) is also attached to the waist member 20 in its entirety in the longitudinal direction by an attachment mechanism (adhesive portion 70) using an adhesive such as a hot melt adhesive. Therefore, the waist member 20 and the leg elastic member 27 are more integrated, and when the diaper 2 is worn, the second elastic member E2 (the leg elastic member 27) and the waist member 20 are linked to each other, and the absorbent core 11 can be pulled up more easily.

[0155] In addition, the first elastic member E1 (waist elastic member 25) is mounted between the first sheet and the second sheet in the thickness direction by being sandwiched by a pair of welded portions 50s from top to bottom. Therefore, compared with the case of being fixed by the adhesive portion 70, it is easy to maintain the softness and elasticity of the waist member 20 and to ensure the bonding strength of the waist member 20.

[0156] ===Others===

[0157] The above-mentioned embodiments are intended to facilitate understanding of the present invention and are not intended to be interpreted as limiting the present invention. The present invention may be modified and improved without departing from the concept thereof, and the present invention also includes equivalent configurations thereof.

[0158] In the above-mentioned embodiment, as an example of a pants-type absorbent article, a diaper 1 in which the skin side sheet 21 in the waist member 20 is continuously formed from one side (front side) to the other side (rear side) in the longitudinal direction is described (refer to Figure 3 The skin side sheet 21 may be formed in the front and rear parts. For example, the absorbent article may be a three-part shorts-type absorbent article consisting of a front outer member (front waistline), a rear outer member (rear waistline) and an absorbent body.

[0159] The waist member 20 of the diaper 1 may be provided with a post-processing belt 80 at a predetermined position. The post-processing belt 80 is a substantially rectangular belt-shaped member (belt member) elongated in the vertical direction (longitudinal direction) and is formed of a resin material such as polyethylene or polypropylene.

[0160] In diaper 1, as Figure 2 as well as Figure 3 As shown in FIG. 1 , the post-processing belt 80 is provided on the non-skin side of the rear waistline portion BA of the waistline member 20 (the non-skin side of the non-skin side sheet 23). One side of the post-processing belt 80 in the vertical direction is fixed to the waistline member 20, and the other side in the vertical direction has an adhesive portion. An adhesive is applied to the adhesive portion, and before the diaper 1 is used, a part of the post-processing belt 80 is folded with the adhesive portion inside to prevent the adhesive portion from being exposed to the outside and protect the adhesive surface.

[0161] When the used diaper 1 is disposed, the diaper 1 is rolled up in the vertical direction with the absorbent body 10 facing inside, and the folded post-processing tape 80 is pulled while being stretched to expose the adhesive portion, and the adhesive portion is rolled around the diaper 1. Thus, the diaper 1 can be kept in a rolled state, and the excrement and the like attached to the inside of the diaper 1 (absorbent body 10) will not leak out, and the diaper 1 can be disposed.

[0162] In the diaper 1, in the up-down direction and the left-right direction, at least a portion of the welded portion 50 joining the skin side sheet 21 (first sheet) and the non-skin side sheet 23 (second sheet) is provided, and the portion overlaps with the post-processing belt 80 (refer to Figure 3 Therefore, in the rear waistline portion BA of the waistline member 20, when viewed in the thickness direction, the waistline member 20 has a higher rigidity in the portion where the post-processing belt 80 overlaps with the welded portion 50 than in the portion where the post-processing belt 80 does not overlap. As a result, when the waistline member 20 is pulled during the wearing action of the diaper 1, it is possible to suppress the waistline member 20 from being excessively stretched or broken, thereby improving the wearability.

[0163] Description of Reference Numerals

[0164] 1 diaper (pants type absorbent article),

[0165] 1a waist opening, 1b leg opening,

[0166] 2. Diapers (pants-type absorbent articles) (modification),

[0167] 10 absorbent body,

[0168] 11 absorbent core, 11b core wrapping sheet,

[0169] 12 top piece, 13 bottom piece, 15 side piece, 15t end piece,

[0170] 20 waist components,

[0171] 20Ff front folded portion, 20Fb rear folded portion,

[0172] 21 skin side piece, 22 non-skin side piece, 23 non-skin side piece, 24 cover piece, 25 waist elastic member,

[0173] 27 leg elastic member, 27a straight portion, 27b curved portion,

[0174] 30 leakproof wall,

[0175] 35. Leakage-proof wall elastic member,

[0176] 40 side joint,

[0177] 50 welded parts, 50s welded parts pairs,

[0178] 60 welding parts,

[0179] 70 bonding portion, 75 bonding surface,

[0180] 80 post-processing belt,

[0181] E1 is the first elastic member, E2 is the second elastic member,

[0182] CL Central Location,

[0183] FA front waist, BA back waist, CA crotch,

[0184] FL20f front bending position, FL20b rear bending position,

[0185] LB dorsal overlap.

Claims

1. A pants-type absorbent article having mutually intersecting up-down directions, left-right directions, and front-back directions, and having an absorbent body having a liquid-absorbent absorbent core and a waist member, characterized in that: At least one side of the waist member in the front-rear direction has: a first elastic member disposed at a position not overlapping the absorbent core in the up-down direction and capable of stretching and contracting in the left-right direction; and a second elastic member which is arranged at a position overlapping the absorbent core in the vertical direction and is stretchable in the horizontal direction; In the above-mentioned left-right direction, in the area where the above-mentioned waist member in the stretched state overlaps with the above-mentioned absorbent core, the total length of the mounting mechanism for mounting the above-mentioned first elastic member on the above-mentioned waist member is smaller than the total length of the mounting mechanism for mounting the above-mentioned second elastic member on the above-mentioned waist member.

2. The pants-type absorbent article according to claim 1, wherein A portion of the second elastic member is disposed in a direction intersecting the left-right direction.

3. The pants-type absorbent article according to claim 1 or 2, wherein: The second elastic member is attached to the waist member by the attachment mechanism using an adhesive.

4. The pants-type absorbent article according to claim 3, wherein: The second elastic member is attached to the waist member in a region on the outside in the left-right direction relative to the absorbent core by the attachment mechanism using the adhesive.

5. The pants-type absorbent article according to claim 3, wherein: The above-mentioned shorts-type absorbent article has a pair of leg openings. The second elastic member is attached to the waist member in a region along the contour of the leg opening by the attachment mechanism using the adhesive.

6. The pants-type absorbent article according to claim 3, wherein: The waist member includes a first sheet and a second sheet stacked on the non-skin side relative to the first sheet. The first sheet and the second sheet are joined to each other by a plurality of dispersed welded portions. The first elastic member is attached to the waist member by being sandwiched between two of the welded portions adjacent to each other in the up-down direction.

7. The pants-type absorbent article according to claim 6, wherein: The waist member includes a plurality of the first elastic members spaced apart in the vertical direction. The welded portion that does not contact the first elastic members is provided between two of the first elastic members that are adjacent to each other in the up-down direction.

8. The pants-type absorbent article according to claim 6, wherein: The second elastic member is sandwiched between the first sheet and a third sheet stacked on the non-skin side relative to the first sheet. In the up-down direction, a portion where the second sheet and the third sheet overlap is provided.

9. The pants-type absorbent article according to claim 8, wherein: In the up-down direction, a portion where the first sheet and the second sheet are joined and a portion where the second sheet and the third sheet are joined at least partially overlap.

10. The pants-type absorbent article according to claim 6, wherein: The pants-type absorbent article has a plurality of welded portions arranged at intervals in the vertical direction. At least a part of the fusion bonded portion row is arranged so as to straddle the outer side edge of the absorbent body in the left-right direction.

11. The pants-type absorbent article according to claim 6, wherein: A folded portion is provided at an upper end portion of the waist member, where the stacked first sheet and second sheet are folded back together from the upper side to the lower side in the up-down direction.

12. The pants-type absorbent article according to claim 11, wherein In the folded portion, at least a portion of the first sheet and the second sheet are joined to each other by the welded portion.

13. The pants-type absorbent article according to claim 6, wherein: The above-mentioned pants-type absorbent article has a belt member arranged on the non-skin side of the above-mentioned waist member, In the up-down direction and the left-right direction, a portion where at least a part of the welded portion joining the first sheet and the second sheet overlaps with the belt member is provided.

14. A pants-type absorbent article having mutually intersecting up-down directions, left-right directions, and front-back directions, and having an absorbent body having a liquid-absorbent absorbent core and a waist member, characterized in that: At least one side of the waist member in the front-rear direction has: a first elastic member disposed at a position not overlapping the absorbent core in the up-down direction and capable of stretching and contracting in the left-right direction; and a second elastic member, which is arranged on the lower side of the first elastic member in the up-down direction, is stretchable in the left-right direction, and has a curved portion that curves from the outside to the inside in the left-right direction and from the upper side to the lower side in the up-down direction, In the above-mentioned left-right direction, in the area between the end on one side and the end on the other side of the above-mentioned waist member, the total length of the mounting mechanism for mounting the above-mentioned first elastic member on the above-mentioned waist member is smaller than the total length of the mounting mechanism for mounting the above-mentioned second elastic member on the above-mentioned waist member.

15. The pants-type absorbent article according to claim 14, wherein: The second elastic member has a low-elasticity region having lower elasticity than other regions in at least a portion of a region overlapping the absorbent core in the left-right direction. In a region outside the low-elasticity region in the left-right direction, a total length of mounting mechanisms for mounting the first elastic member to the waist member is shorter than a total length of mounting mechanisms for mounting the second elastic member to the waist member.

16. The pants-type absorbent article according to claim 14 or 15, characterized in that: The second elastic member is attached to the waist member by the attachment mechanism using an adhesive.

17. The pants-type absorbent article according to claim 16, wherein: The waist member includes a first sheet and a second sheet stacked on the non-skin side relative to the first sheet. The first sheet and the second sheet are joined to each other by a plurality of dispersed welded portions. The first elastic member is attached to the waist member by being sandwiched between two of the welded portions adjacent to each other in the up-down direction.

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