Shorts-type absorbent article

Abstract

The present invention provides a pair of shorts-type absorbent article that prevents peeling during wearing and easy tearing during disposal. The pair of shorts-type absorbent article includes an absorbent main body, an outer cover, and a pair of side joints. The pair of side joints has a waist region within 25 mm from a waist end in the longitudinal direction, and a plurality of seal portions arranged at intervals of a second dimension smaller than a first dimension between an inner end and an outer end in the lateral direction. The pair of side joints also has a plurality of cross seal portions having a cross portion intersecting with a joint strength reducing agent outside the inner end and the outer end. The plurality of cross seal portions includes a first cross seal portion having a cross distance between the inner end and the cross portion smaller than the second dimension, and a second cross seal portion adjacent to the first cross seal portion on the leg end side, having a cross distance smaller than the cross distance of the first cross seal portion.

Description

Technical Field

[0001] This invention relates to absorbent articles such as disposable diapers and shorts. Background Technology

[0002] Shorts-type absorbent garments typically include an absorbent body, an outer body, and a side joint (side seal) formed by joining the ventral and back outer bodies at their side ends. The ventral and back outer bodies are joined together to form the waist portion of the shorts-type absorbent garment.

[0003] On the other hand, from a hygiene point of view, after wearing shorts-type absorbent clothing, the side seams are sometimes torn open to discard it. Therefore, the side seams are required to have the function of not peeling off during the wearing action (when putting the shorts-type absorbent clothing on the body) and while wearing (when already worn), and to be easily torn open when discarded.

[0004] From this perspective, Patent Document 1 discloses a shorts-type absorbent article, in which the joints at both ends of the ventral and dorsal sides of the outer body have strength-reducing regions with a bonding strength-reducing agent disposed thereon and non-strength-reducing regions without the bonding strength-reducing agent disposed thereon. In this document, the joints are arranged continuously in the length direction, and the strength-reducing regions are, for example, located on the inner and / or outer sides of the joints in the width direction.

[0005] Patent document 2 discloses a shorts-type wearable article in which a bonding strength reducing agent is disposed between the pieces of the side joint, and the bonding strength reducing agent is disposed more on the outer part of the side joint in the width direction than on the inner part.

[0006] Existing technical documents

[0007] Patent documents

[0008] Patent Document 1: Japanese Patent Application Publication No. 2011-72577

[0009] Patent Document 2: Japanese Patent Application Publication No. 2018-88945 Summary of the Invention

[0010] The problem that the invention aims to solve

[0011] The technologies described in Patent Documents 1 and 2 both adjust the bonding strength of the side joints by using a bonding strength reducing agent, but from the viewpoint of preventing peeling during wearing and easy tearing during disposal, there is room for further improvement.

[0012] The subject of this invention relates to shorts-type absorbent articles that can both prevent peeling during wearing and easy tearing during disposal.

[0013] Technical solutions for solving the problem

[0014] One aspect of the present invention is a shorts-type absorbent article comprising: an absorbent body; an outer body disposed on the non-skin-facing side of the absorbent body, including a ventral region and a dorsal region located on both sides in the longitudinal direction, and formed by stacking a plurality of thermoplastic sheets; and a pair of side joints joining the ventral region and the dorsal region of the outer body at lateral edges in a transverse direction orthogonal to the longitudinal direction.

[0015] The pair of side joints have: a waist end and a leg end forming the two ends of the longitudinal direction; a waist region within 25 mm from the waist end in the longitudinal direction; and a plurality of sealing portions arranged along the longitudinal direction.

[0016] The plurality of sealing portions extend laterally between the inner and outer ends and are arranged at intervals of a second dimension smaller than the first dimension between the inner and outer ends.

[0017] At least one of the pair of side joints further comprises: a bonding strength reducing agent disposed linearly between the thermoplastic sheets; and a plurality of cross-sealing portions included in the plurality of sealing portions, arranged continuously in the longitudinal direction in the waist region, having cross-sections intersecting the bonding strength reducing agent outside the inner end and the outer end.

[0018] The plurality of cross-sealing portions include: a first cross-sealing portion, wherein the cross distance between the inner end and the cross portion is less than the second dimension; and a second cross-sealing portion, which is adjacent to the first cross-sealing portion on the leg end side, wherein the cross distance is less than the cross distance of the first cross-sealing portion.

[0019] Invention Effects

[0020] The shorts-type absorbent article according to the present invention can both prevent peeling during wearing and ease of tearing when discarded. Attached Figure Description

[0021] Figure 1 This is a schematic perspective view showing a shorts-type absorbent article according to the first embodiment of the present invention.

[0022] Figure 2 This is a schematic plan view showing the skin-facing side of the aforementioned shorts-type absorbent item, and a diagram showing the state in which the aforementioned shorts-type absorbent item is unfolded and the elastic components of each part are stretched and unfolded into a planar shape.

[0023] Figure 3This is a schematic plan view showing the side joint of the aforementioned shorts-type absorbent article.

[0024] Figure 4 This is a schematic cross-sectional view of the aforementioned side joint, showing the state in which the ventral and dorsal regions are separated.

[0025] Figure 5 This is a schematic plan view showing the side joint of a modified embodiment described above.

[0026] Figure 6 This is a schematic plan view showing the side joint of a modified embodiment described above.

[0027] Figure 7 This is a schematic plan view illustrating the configuration of the embossed portion of the skin side plate at the aforementioned side joint.

[0028] Figure 8 This is a schematic cross-sectional view of the side joint of the shorts-type absorbent article according to the second embodiment of the present invention, showing the state in which the abdominal region and the back region are separated.

[0029] Figure 9 This is a schematic cross-sectional view of the side joint of the shorts-type absorbent article according to the third embodiment of the present invention, showing the state in which the abdominal region and the back region are separated.

[0030] Figure 10 This is a schematic cross-sectional view of the side joint of the shorts-type absorbent article according to the fourth embodiment of the present invention, showing the state in which the abdominal region and the back region are separated. Detailed Implementation

[0031] Hereinafter, embodiments of the present invention will be described with reference to the accompanying drawings.

[0032] <First Embodiment>

[0033] [The overall structure of shorts-type disposable diapers]

[0034] exist Figure 1 and Figure 2 In this document, a shorts-type absorbent article according to the first embodiment of the present invention is shown as a shorts-type disposable diaper 1. Hereinafter, the shorts-type disposable diaper 1 will be referred to as diaper 1.

[0035] like Figure 1As shown, the diaper 1 includes a waist opening 1W and a pair of leg openings 1L, and is worn around the wearer's waist and crotch when worn. The waist opening 1W has a waist opening end Wa. The diaper 1 has a longitudinal direction X and a transverse direction Y. The longitudinal direction X extends from the wearer's abdomen through the crotch towards the back. The transverse direction Y is orthogonal to the longitudinal direction X, corresponding to the wearer's left and right directions. Moreover, as... Figure 2 As shown, the direction orthogonal to the longitudinal X and transverse Y of diaper 1 is set as the thickness direction Z.

[0036] In this specification, "waist side" refers to the side on the longitudinal X direction closest to the waist opening end Wa of the waist opening 1W, and "leg side" refers to the side on the longitudinal X direction furthest from the waist opening end Wa.

[0037] In this instruction manual, "inner side of transverse Y" refers to the side of transverse Y that is close to the longitudinal center line CL, which divides the shorts-type absorbent item (diaper 1) into two equal parts on transverse Y, and "outer side of transverse Y" refers to the side that is away from the longitudinal center line CL.

[0038] In this instruction manual, regarding the thickness direction Z, the side of the absorbent garment (diaper 1) that is in contact with the wearer's skin when wearing the garment is sometimes referred to as the skin side, and the side that is in contact with the clothing is referred to as the non-skin side. Furthermore, "skin-facing side" refers to the side of the absorbent garment (diaper 1) or its components that faces the wearer's skin, i.e., the side relatively close to the wearer's skin. "Non-skin-facing side" refers to the side of the absorbent garment (diaper 1) or its components that faces the opposite side (clothing side), i.e., the side relatively far from the wearer's skin.

[0039] When the wearer puts on diaper 1, first, the legs are passed through the pair of leg openings 1L, diaper 1 is lifted towards the body, and diaper 1 is positioned around the wearer's waist and crotch. In this instruction manual, this series of actions is referred to as the "wearing action". Sometimes the wearing action is not performed by the wearer of diaper 1, but by the caregiver. Therefore, in this instruction manual, the subject of the wearing action is designated as "caregiver, etc."

[0040] In addition, in this instruction manual, the state in which the diaper 1 is positioned in the appropriate wearing position as normally intended by the wearer is referred to as "wearing".

[0041] like Figure 1 and Figure 2 As shown, the diaper 1 includes an absorbent body 4 and an outer body 5 disposed on the non-skin-facing side of the absorbent body 4.

[0042] in addition, Figure 2This refers to a planar expansion of the diaper 1 in a manner that allows the elastic components of each part to stretch to a state where the influence of the elastic components is completely eliminated. This state is also called the "expanded and stretched state" of the diaper 1. Expanding the diaper 1 means separating the ventral region 5a and the dorsal region 5b of the side joint 8, which will be described later.

[0043] The absorbent body 4 is fixed to the skin-facing side of the outer casing 5. The absorbent body 4 has at least an absorbent core 40, and may also have a surface sheet 2, a back sheet (not shown), etc. For example, the absorbent body 4 has a structure in which the back sheet, the absorbent core 40, and the surface sheet 2 are stacked in the thickness direction Z. The absorbent core 40 includes a liquid-retaining absorbent core, and may also include a chip covering the absorbent core.

[0044] The materials used in the various structures (back sheet, absorber 40, surface sheet 2, etc.) included in the absorbent body 4 can be used without particular limitation, and are materials used in the field of this technology.

[0045] The outer casing 5 comprises a plurality of thermoplastic sheets 50. The outer casing 5 may be configured, for example, as a stack of a plurality of thermoplastic sheets 50.

[0046] Thermoplastic sheet 50 is a sheet material mainly composed of thermoplastic resin. Thermoplastic sheet 50 preferably contains more than 90% by mass of thermoplastic resin, and more preferably is composed of 100% by mass of thermoplastic resin.

[0047] Examples of thermoplastic resins include polyolefins such as polyethylene and polypropylene; polyesters such as polyethylene terephthalate; polyamides such as nylon 6 and nylon 66; and polyacrylic acid, polyalkyl methacrylate, polyvinyl chloride, and polyvinylidene chloride. One or more of these resins can be used alone or in combination. Thermoplastic fibers can be short or long fibers. As thermoplastic fibers, composite fibers such as core-sheath type or parallel type, split fibers, irregularly shaped cross-section fibers, and heat-shrinkable fibers can also be used.

[0048] The outer garment 5 has at least a ventral region 5a disposed on the ventral side of the wearer and a dorsal region 5b disposed on the dorsal side of the wearer. In this embodiment, the outer garment 5 also includes a crotch region 5c located between the ventral region 5a and the dorsal region 5b and disposed at the crotch of the wearer. In this example, the ventral region 5a, the crotch region 5c, and the dorsal region 5b are arranged along the longitudinal direction X. Furthermore, the outer garment 5 has a shape that narrows inwardly in the lateral direction Y in the crotch region 5c. This forms a leg opening 1L along the circumference of the wearer's leg (see reference). Figure 1 ).

[0049] The outer edge of the outer body 5 is preferably configured to be symmetrical about the longitudinal center line CL (left-right symmetrical).

[0050] Furthermore, the outer casing 5 has a pair of side joints 8, which are formed by joining the side edge 5d of the ventral region 5a in the transverse Y direction and the side edge 5e of the dorsal region 5b in the transverse Y direction. That is, the right side joint 8 has a structure in which the right side edge 5d of the ventral region 5a and the right side edge 5e of the dorsal region 5b are joined together in the thickness direction Z. The left side joint 8 has a structure in which the left side edge 5d of the ventral region 5a and the left side edge 5e of the dorsal region 5b are joined together in the thickness direction Z.

[0051] The details of the side joint 8 are described later, and it is preferred to join by means of heat sealing, ultrasonic sealing, etc.

[0052] [Structure of the side joint]

[0053] like Figure 2 As shown, a pair of side joints 8 each have a waist end 8a and a leg end 8b that form the two ends of the longitudinal X.

[0054] The waist end 8a is the waist-side end of the side joint 8.

[0055] The leg end 8b is the end on the leg side of the side joint 8.

[0056] Each side joint 8 has a structure that extends longitudinally X from the waist end 8a to the leg end 8b.

[0057] Using a pair of side joints 8 extending from the waist end 8a to the leg end 8b respectively, the ventral region 5a and the dorsal region 5b become tubular along the wearer's waist, forming the waist opening 1W and leg opening 1L of the diaper 1. Preferably, the side joints 8 maintain the ventral region 5a and the dorsal region 5b in an engaged state without peeling during the wearing action and while wearing.

[0058] In this specification, the situation in which the ventral region 5a and dorsal region 5b of the side joint 8 are accidentally separated during the wearing of the diaper 1 is described as "peeling".

[0059] On the other hand, when changing diaper 1 after wearing it, from the point of view of hygienically disposing of the excrement attached to diaper 1, caregivers sometimes separate the ventral region 5a and the dorsal region 5b of the side joint 8, unfold diaper 1 and discard it.

[0060] In this specification, the action of intentionally separating the ventral region 5a and the dorsal region 5b of the side joint 8 by applying external force to the side joint 8 and / or its surroundings when discarding the diaper 1 is described as "tearing".

[0061] Thus, the side joint 8 preferably has a structure that prevents peeling during wearing and is easy to tear when discarded.

[0062] Based on the above viewpoints, such as Figure 3 As shown, in this embodiment, each pair of side joints 8 includes a plurality of sealing portions S and a joint strength reducing agent 9. The pair of side joints 8 preferably have the same structure. The structure of one side joint 8 will be described in detail below.

[0063] Furthermore, unless otherwise stated, the dimensions and angles of each part in this specification are measured in their natural state without stretching the elastic components of each part.

[0064] The sealing part S is the portion where the thermoplastic sheets 50 of the ventral region 5a and the dorsal region 5b are fused together. The sealing part S is joined, for example, by a pressure unit and / or a heating unit, specifically by heat sealing, ultrasonic sealing, etc.

[0065] Multiple sealing parts S are arranged at intervals in the longitudinal direction X and extend in the transverse direction Y.

[0066] By arranging multiple sealing portions S spaced apart in the longitudinal direction X, it is possible to prevent the side joint portion 8 from peeling off entirely along the longitudinal direction X in the event that one sealing portion S peels off.

[0067] like Figure 3 As shown, from the viewpoint of stabilizing the overall joint strength of the side joint 8, the multiple sealing parts S are preferably arranged at equal intervals in the longitudinal direction X.

[0068] "The sealing part S extends in the transverse Y direction" means that the dimension of the sealing part S in the transverse Y direction is larger than the dimension in the longitudinal X direction, so that the sealing part S as a whole extends in the transverse Y direction. That is, the sealing part S is not limited to extending in a way that is parallel to the transverse Y direction.

[0069] The sealing portion S includes an inner end portion Sc, which is the end portion inside the transverse Y, and an outer end portion Sd, which is the end portion outside the transverse Y.

[0070] Furthermore, the sealing portion S may include, for example, the end on the waist end 8a side, i.e., the upper end Sa extending in the transverse Y direction, and the end on the leg end 8b side, i.e., the lower end Sb extending in the transverse Y direction.

[0071] exist Figure 3 In the example shown, the sealing part S is configured as a rectangular shape that extends laterally in the Y direction when viewed from above.

[0072] exist Figure 3The first dimension D1 is defined as the first dimension D1 of the transverse Y dimension of a plurality of sealing parts S. The first dimension D1 is defined as the distance between the inner end Sc and the outer end Sd of each sealing part S.

[0073] In addition, Figure 3 In the figure, a second dimension D2 is indicated, which defines the longitudinal X interval of a plurality of sealing parts S. The second dimension D2 is defined as the distance between the lower end Sb of the sealing part S and the upper end Sa of the sealing part S adjacent to the sealing part S on the leg end 8b side.

[0074] In the side joint portion 8, from the viewpoint of preventing peeling during wearing and wearing, it is preferable that the longitudinal X intervals of the plurality of sealing portions S are narrower, that is, it is preferable that the second dimension D2 is smaller. Therefore, in the side joint portion 8, the second dimension D2 is smaller than the first dimension D1, that is, the relationship "D2 / D1 < 1" is satisfied.

[0075] The bonding strength reducing agent 9 is disposed between the thermoplastic sheets 50 of the outer casing 5 and has a linearly extending structure. For example, the bonding strength reducing agent 9 is disposed between the thermoplastic sheets 50 of the outer casing 5 at a location overlapping a portion of the sealing portion S before the sealing process used to form the sealing portion S. The bonding strength reducing agent 9 has the function of hindering the welding of the thermoplastic resin in this sealing process, thereby reducing the bonding strength of the sealing portion S. Specific examples of the bonding strength reducing agent 9 will be described later.

[0076] The bonding strength reducing agent 9 can be disposed between the thermoplastic sheets 50 included in the ventral region 5a, or between the thermoplastic sheets 50 included in the dorsal region 5b. Alternatively, the bonding strength reducing agent 9 can also be disposed between the thermoplastic sheets 50 on the skin-closest side of the ventral region 5a and the thermoplastic sheets 50 on the skin-closest side of the dorsal region 5b, which are opposite each other in the lateral joint portion 8.

[0077] "The bonding strength reducing agent 9 extends in a linear manner" means that the bonding strength reducing agent 9 extends in a straight line and / or a curved manner.

[0078] like Figure 3 As shown, the plurality of sealing portions S includes at least a first cross sealing portion S1 and a second cross sealing portion S2. The first cross sealing portion S1 and the second cross sealing portion S2 are the sealing portions S that intersect with the bonding strength reducing agent 9 when viewed from above, and have the following structure.

[0079] The first cross-sealing portion S1 and the second cross-sealing portion S2 are disposed in the waist region 8c, located within 25 mm of the waist end 8a. The inventors of this invention have discovered that, at the start of a tearing action for disposal, the fingers of a caregiver or the like are easily positioned approximately 25 mm to 30 mm from the waist opening end Wa on both sides of the transverse Y-shaped joint 8. Therefore, the waist region 8c becomes a region where an external force (also called a "tearing force") is particularly easily applied during disposal.

[0080] The first cross-sealing portion S1 and the second cross-sealing portion S2 are arranged adjacent to each other from the waist end 8a side to the leg end 8b side. That is, the first cross-sealing portion S1 is arranged on the waist side and the second cross-sealing portion S2 is arranged on the leg side.

[0081] like Figure 3 As shown in the example, the first cross-sealing portion S1 is preferably the sealing portion S located closest to the waist end 8a among a plurality of sealing portions S. Thus, the sealing portion S closest to the waist end 8a crosses with the bonding strength reducing agent 9 as the first cross-sealing portion S1. This makes the side joint 8 easier to tear from a position closer to the waist end 8a, improving tearing ease. Furthermore, the first cross-sealing portion S1 is not limited to the sealing portion S located on the waist side in the waist region 8c; it is acceptable as long as the first cross-sealing portion S1 and the second cross-sealing portion S2 are located in the waist region 8c.

[0082] In addition, from the viewpoint of preventing peeling during wearing and wearing, the first cross-sealing part S1 and the second cross-sealing part S2 cross with the bonding strength reducing agent 9 at the parts other than the inner end Sc and the outer end Sd when viewed from above.

[0083] That is, the bonding strength reducing agent 9 traverses the first cross-sealing portion S1 and the second cross-sealing portion S2 in a direction intersecting with the transverse Y, extending at least from the upper end Sa of the first cross-sealing portion S1 to the lower end Sb of the second cross-sealing portion S2.

[0084] In the first cross-sealing part S1 and the second cross-sealing part S2, if the part that overlaps with the bonding strength reducing agent 9 when viewed from above is defined as the cross part 9s, then the cross part 9s is not located at the inner end Sc and the outer end Sd, but is located between the inner end Sc and the outer end Sd.

[0085] Each of the cross-sealing portions S1 and S2 preferably has one cross portion 9s. For example, in the side joint portion 8, it is more preferable that a joint strength reducing agent 9 crosses with the first cross-sealing portion S1 and the second cross-sealing portion S2 at one location.

[0086] During the tearing action, the caregiver's fingers first apply an oblique force to the side joint 8 from the inside of the waist end 8a, which has both longitudinal (X) downward and transverse (Y) outward components. Therefore, in the waist region 8c, the caregiver's fingers can easily apply a downward oblique force to the side joint 8 at approximately 45° relative to both longitudinal (X) downward and transverse (Y) outward. Thus, in the side joint 8, starting from the sealing portion S on the waist end 8a side, it is torn sequentially from the inner end Sc to the outer end Sd.

[0087] As described above, in the narrowly spaced side joints 8 along the longitudinal X of the multiple sealing portions S, the tearing of the next sealing portion S begins before the tearing of the sealing portion S on the waist end 8a side is completed. In the side joints 8, two adjacent sealing portions S are torn open simultaneously at close range, thereby applying excessive load locally to the outer body 5. As a result, in the side joints 8, the outer body 5 breaks at the portion adjacent to the sealing portion S, and sometimes a so-called lateral tear occurs where the breakage of the outer body 5 travels laterally outward along the length direction of the sealing portion S. If a lateral tear occurs in the outer body 5, each tearing action is interrupted, thus causing significant stress to caregivers or wearers.

[0088] In response, in the side joint 8, the first cross-sealing part S1 and the second cross-sealing part S2 located in the waist region 8c are configured to prevent the outer body 5 from being torn laterally.

[0089] exist Figure 3 The distance a1 represents the distance between the inner end Sc of the first cross-sealing part S1 and the cross part 9s, and the distance a2 represents the distance between the inner end Sc of the second cross-sealing part S2 and the cross part 9s. Both cross distances a1 and a2 are greater than zero and smaller than the first dimension D1 of the transverse Y of the sealing part S. Cross distances a1 and a2 can be the average of the values ​​measured at the upper end Sa and the lower end Sb.

[0090] In the side joint 8, the cross distance a1 of the first cross seal S1 is smaller than the second dimension D2, which defines the longitudinal X interval of the plurality of seals S. Therefore, in the side joint 8, before the tearing of the second cross seal S2 begins, the tearing of the first cross seal S1 proceeds to the cross section 9s where the joint strength is weak. Thus, in the side joint 8, the load applied to the outer body 5 at the start of the tearing of the second cross seal S2 is suppressed, thereby preventing lateral tearing of the outer body 5.

[0091] Furthermore, in the side joint 8, the cross distance a2 of the second cross-sealing portion S2 is less than or equal to the cross distance a1 of the first cross-sealing portion S1. Therefore, in the side joint 8, the tearing of the second cross-sealing portion S2 can proceed to the cross portion 9s where the joint strength is weak, before the tearing of the first cross-sealing portion S1 is completed. Thus, in the side joint 8, even if the tearing of the first cross-sealing portion S1 continues beyond the cross portion 9s, the load applied to the outer body 5 can be suppressed, thereby preventing lateral tearing of the outer body 5.

[0092] Furthermore, from the viewpoint of preventing the outer cover 5 from tearing laterally, for each part of the outer cover 5 that divides the side joint portion 8 into three parts in the longitudinal X direction, the transverse Y-direction breaking strength of the outer cover 5 constituting the ventral region 5a and the dorsal region 5b respectively is preferably greater than the peel strength when the multiple sealing portions S, excluding the cross portion 9s, are peeled along the transverse Y direction. Thus, the outer cover 5 will not break, and the sealing portions S can be easily torn apart by peeling them. The breaking strength of the outer cover 5 and the peel strength of the multiple sealing portions S can be obtained, for example, by tensile testing on a sample obtained by cutting out the portion of the outer cover 5 containing the side joint portion 8 from the diaper 1.

[0093] Additionally, in the side joint 8, such as Figure 3 As shown, the bonding strength reducing agent 9 is preferably present continuously between the intersection 9s of the first cross-sealing portion S1 and the second cross-sealing portion S2. Thus, between the first cross-sealing portion S1 and the second cross-sealing portion S2, the bonding strength reducing agent 9 acts to prevent the fracture of the outer body 5 from propagating laterally outward in the Y direction, thereby preventing lateral tearing in the outer body 5.

[0094] [Example of the structure of the outer casing]

[0095] like Figure 4 As shown, the outer body 5 preferably comprises an outer layer 51 and an inner layer 52 as a plurality of thermoplastic sheets 50. The outer layer 51 is disposed at a position closer to the non-skin side than the inner layer 52, forming the non-skin-facing surface of the outer body 5. Preferably, an elastic member 10, described later, is disposed between the inner layer 52 and the outer layer 51.

[0096] In this embodiment, at least a portion of the outer garment 5 folds back from the waist opening end Wa towards the skin side, thus the outer garment 5 has a folded-back structure. Figure 4 In the example shown, only the outer layer 51 is folded back from the waist end 8a toward the skin side.

[0097] Among them, Figure 4 In the cross-sectional view, for illustration purposes, the ventral region 5a and the dorsal region 5b of the side joint 8 are shown as separate.

[0098] exist Figure 4 In the example shown, the waist region 8c is located in the region containing the folded-back structure of the outer body 5.

[0099] In this case, in the waist region 8c, among the multiple thermoplastic sheets 50 of the outer body 5, the skin side sheet P that forms the skin-facing side is the folded-back outer sheet 51, and the adjacent sheet Q adjacent to the skin side sheet P is the inner sheet 52.

[0100] Furthermore, the skin-side sheet P is located on the skin-side within the waist region 8c of both the ventral region 5a and the dorsal region 5b. The skin-side sheet P of the ventral region 5a and the skin-side sheet P of the dorsal region 5b are in contact and sealed together in a relative position. That is, the skin-facing surfaces of the skin-side sheet P become the joint interface of the side joint 8.

[0101] [Example of a formulation for a bonding strength reducing agent]

[0102] From the viewpoint of more effectively reducing the bonding strength of the seal S, the bonding strength reducing agent 9 is preferably configured as follows.

[0103] like Figure 4 As shown, the bonding strength reducing agent 9 is preferably disposed in the waist region 8c between the skin-side sheet P and the adjacent sheet Q. Figure 4 In the example shown, the bonding strength reducing agent 9 is disposed in the ventral region 5a, but it can also be disposed in the dorsal region 5b, or in both the ventral region 5a and the dorsal region 5b.

[0104] Therefore, a bonding strength reducing agent 9 is disposed between the skin-side piece P, which becomes the bonding interface, and its adjacent adjacent piece Q during sealing. This allows the bonding strength reducing agent 9 to readily exert its hindering effect on the weld between the ventral region 5a and the dorsal region 5b, effectively reducing the bonding strength of the intersection 9s. As a result, ease of tearing is further improved.

[0105] From the viewpoint of further improving tearability, it is preferable that the penetration depth of the bonding strength reducing agent 9 in the skin side sheet P is deeper than the penetration depth of the bonding strength reducing agent 9 in the adjacent sheet Q.

[0106] Penetration depth refers to the depth to which the bonding strength reducer 9 penetrates from the coating surface into the sheet thickness direction. Penetration depth can be measured as follows.

[0107] (Method for measuring the penetration depth of bonding strength reducing agents)

[0108] The side joint portion 8 of the object being measured was cut along the longitudinal (X) and transverse (Y) axes to create a measurement piece revealing the cross-section of the bonding strength reducing agent 9. Next, a magnified image of the cross-section of the side joint portion 8 of the measurement piece was captured at 200x magnification using a KEYENCE VHX1000 microscope, obtaining an image of its field of view. In this field of view, the portion infiltrated with the bonding strength reducing agent 9 was observed as a transparent, luminescent part; therefore, the outline of this portion was determined, and the area enclosed by this outline was measured. This measurement was performed at five locations in the waist region 8c, and their average value was taken as the penetration depth of the bonding strength reducing agent 9 in the waist region 8c.

[0109] Therefore, the bonding strength reducer 9 can easily move from the non-skin-facing side of the skin-side sheet P to the skin-facing side of the bonding interface, thus more effectively exerting its welding resistance effect. Consequently, it can more effectively improve tear-off ease.

[0110] [Structural example of a cross-sealing section]

[0111] The first cross-sealing part S1 and the second cross-sealing part S2 are any sealing parts S disposed in the waist region 8c, and are not limited to... Figure 3 The structure shown.

[0112] For example, from the viewpoint of improving the ease of tearing in the longitudinal direction X, multiple seals S may also include three or more intersecting seals.

[0113] exist Figure 5 In the example shown, the multiple sealing portions S include a first cross sealing portion S1, a second cross sealing portion S2, a third cross sealing portion S3, and a fourth cross sealing portion S4. In this case, it is preferable that the cross distances a1, a2, a3, and a4 of the cross sealing portions S1, S2, S3, and S4 monotonically decrease from the waist end 8a side towards the leg end 8b side. As a result, the area where the load applied to the outer body 5 when tearing the waist region 8c is suppressed is expanded in the side joint portion 8, thus more effectively preventing lateral tearing of the outer body 5.

[0114] Not limited to the above structure, the multiple sealing portions S can be configured such that each sealing portion S includes three or more n intersecting sealing portions S1, S2, ..., Sn, which are sealing portions S that intersect with the bonding strength reducing agent 9, including a first intersecting sealing portion S1 and a second intersecting sealing portion S2. In this case, it is preferable that the intersecting distances a1 to an of the three or more intersecting sealing portions S1 to Sn monotonically decrease from the waist end 8a side to the leg end 8b side. Monotonically decreasing means satisfying the relationship that the intersecting distance an is shorter than the intersecting distance an-1.

[0115] Furthermore, from the viewpoint of further improving ease of tearing, the multiple cross-sealing portions are preferably configured such that in the aforementioned longitudinal direction X, in a region of 10 mm or more, the cross distance an decreases monotonically from the waist end 8a side to the leg end 8b side. For example, the multiple sealing portions S are preferably configured such that all sealing portions S in the region within 10 mm from the upper end Sa of the first cross-sealing portion S1 to the leg end 8b side are arranged in a manner in which the cross distance decreases monotonically from the waist end 8a side to the leg end 8b side.

[0116] The area within 10 mm of the leg end 8b, starting from the first cross-sealing portion S1, is located near the area where caregivers or others who are about to discard their items can easily place their fingers. This area is also where a particularly strong lateral Y-force is easily applied when the tearing action begins. By configuring all the sealing portions S in this area as cross-sealing portions Sn, lateral tearing of the outer body 5 can be more effectively suppressed.

[0117] Furthermore, in the side joint 8, such as Figure 5 As shown, the preferred bonding strength reducing agent 9 connects the intersections 9s of the cross-sealing portions S1, S2, ..., Sn in a series. Thus, between the cross-sealing portions S1, S2, ..., Sn, the bonding strength reducing agent 9 acts in a way that prevents the fracture of the outer casing 5 from propagating outward in the lateral Y direction, thereby preventing lateral tearing in the outer casing 5.

[0118] Furthermore, in the diaper 1, it is preferable that both of the pair of side joints 8 have the aforementioned structure of the bonding strength reducing agent 9 and multiple cross-sealing portions, but depending on the circumstances, it is also permissible for only one of the pair of side joints 8 to have the aforementioned structure of the bonding strength reducing agent 9 and multiple cross-sealing portions.

[0119] [Example of sealing dimensions]

[0120] Regarding the dimensions of the sealing portion S, which includes the first cross-sealing portion S1 and the second cross-sealing portion S2, the following examples can be cited from the viewpoint of balancing prevention of peeling and tearing during wearing and ease of wearing. Furthermore, as mentioned above, the following dimensions are the dimensions in their natural state without the elastic member stretching.

[0121] The first dimension D1 of the transverse Y of the sealing portion S is preferably 0.5 mm or more, more preferably 1 mm or more, and preferably 10 mm or less, more preferably 4 mm or less. It is also preferably 0.5 mm or more and 10 mm or less, more preferably 1 mm or more and 4 mm or less.

[0122] The longitudinal dimension X of the sealing portion S is preferably 0.1 mm or more, more preferably 0.3 mm or more, and preferably 2 mm or less, more preferably 0.6 mm or less. It is also preferably 0.1 mm or more and 2 mm or less, and more preferably 0.3 mm or more and 0.6 mm or less.

[0123] The first dimension D1 of the transverse Y of the sealing part S is preferably 400% or more and 800% or less relative to the longitudinal X of the sealing part S.

[0124] The second dimension D2, which defines the longitudinal X interval of the plurality of sealing portions S, is smaller than the first dimension D1 as described above. It is preferably 0.1 mm or more, more preferably 1 mm or more, and preferably 10 mm or less, more preferably 4 mm or less. It is also preferably 0.1 mm or more and 10 mm or less, more preferably 1 mm or more and 4 mm or less.

[0125] [Structural Example of an Elastic Component]

[0126] like Figure 2 As shown, the ventral region 5a and dorsal region 5b of the outer body 5 include a plurality of elastic members 10 extending in the transverse Y direction.

[0127] Multiple elastic components 10 are disposed among multiple thermoplastic sheets 50 of the outer casing 5. Figure 4 In the example shown, multiple elastic components 10 are disposed between the outer sheet 51 and the inner sheet 52.

[0128] By utilizing these elastic components 10 to stretch the waist of the diaper 1, the wearing process becomes easy and maintains a good fit when worn.

[0129] Furthermore, "the elastic member 10 extends in the transverse Y direction" means that the elastic member 10 extends in the transverse Y direction in its extended state. However, the above statement is not limited to the elastic member 10 being parallel to the transverse Y direction in its extended state, but also includes the entire elastic member extending in the transverse Y direction.

[0130] Moreover, such as Figure 2 As shown, in addition to the elastic member 10 mentioned above, the outer body 5 may also include a leg elastic member 11 disposed around the leg opening 1L.

[0131] The elastic components 10 and 11 can preferably be linear (rubber thread, etc.) or rope-like (rubber strip, etc.) components with a rectangular, square, circular, or polygonal cross-section, or multifilament type linear components. The materials of the elastic components 10 and 11 can be materials used in existing technologies for absorbent articles such as disposable diapers without particular restrictions, such as synthetic rubbers such as styrene-butadiene, butadiene, isoprene, and chloroprene rubber, natural rubber, EVA, stretchable polyolefins, and polyurethane.

[0132] From the viewpoint of ensuring the overall elasticity of the waist, the outer end of the lateral Y of the elastic member 10 of each of the abdominal region 5a and the back region 5b is preferably located at or near the side joint 8. Specifically, the distance between this end and the side joint 8 in the lateral Y direction is preferably 10 mm or less, and more preferably 0 mm, that is, the end is located within the side joint 8.

[0133] In this case, the multiple sealing portions S contract in the transverse Y direction, that is, they can extend in the transverse Y direction. By extending in the transverse Y direction in this way, the first dimension D1 in its natural state without the elastic member 10 extending can be kept small, and the bonding strength can be improved. From the viewpoint of preventing transverse tearing of the outer body 5 and obtaining higher bonding strength, the multiple sealing portions S are preferably able to extend in the transverse Y direction to more than 1.2 times the first dimension D1.

[0134] The elastic element 10 is typically positioned in or near the area where force is applied during tearing, which can easily affect the ease of tearing when discarded.

[0135] Therefore, from the viewpoint of improving the ease of tearing upon disposal, the elongation of the elastic component is preferably adjusted as follows.

[0136] like Figure 2 As shown, the ventral region 5a and the dorsal region 5b each have a telescopic region divided into a lumbar telescopic region 5f and a leg-side telescopic region 5g. These regions are defined by an imaginary boundary line extending parallel to the transverse Y at a position 25 mm from the lumbar opening end Wa in the longitudinal X direction. That is, the lumbar telescopic region 5f is located within 25 mm of the lumbar opening end Wa in the longitudinal X direction. The two transverse Y edges of the lumbar telescopic region 5f correspond to the aforementioned lumbar region 8c. The leg-side telescopic region 5g is located on the leg side in the longitudinal X direction, closer to the lumbar telescopic region 5f. Furthermore, the dividing line between the lumbar telescopic region 5f and the leg-side telescopic region 5g extends parallel to the transverse Y at a position 25 mm from the lumbar opening end Wa in the extended state.

[0137] The waist extension region 5f includes a plurality of elastic members 10 extending laterally in the Y direction. Similarly, the leg extension region 5g includes a plurality of elastic members 10 extending laterally in the Y direction. The average elongation of the plurality of elastic members 10 in the waist extension region 5f is preferably lower than the average elongation of the plurality of elastic members 10 in the leg extension region 5g.

[0138] The elongation rate of the elastic component 10 refers to the ratio of the length of the elastic component that has elongated in the unfolded and stretched state of the shorts-type absorbent article to the length of the elastic component at its natural length when removed from the shorts-type absorbent article.

[0139] That is, there is a tendency that the lower the elongation, the smaller the elastic force when stretching the elastic component 10.

[0140] Furthermore, during manufacturing, the elongation rate of the elastic member 10 disposed on the outer casing 5 can be adjusted by adjusting the degree of elongation. During manufacturing, for example, the elastic member 10 is elongated to a predetermined length, and an adhesive is applied to the elastic member 10 using a comb or the like to fix the elastic member 10 to the thermoplastic sheet 50 of the outer casing 5.

[0141] As described above, during the tearing action, a lateral Y-force is easily applied directly to the waist region 8c. In the above structure, the average elongation of the elastic member 10 in the waist stretching region 5f is low, resulting in low elasticity of the elastic member 10, which acts as a resistance to the tearing force. Consequently, the energy of the tearing force is not easily dissipated due to the elongation of the elastic member 10, and even weaker forces can tear efficiently. Therefore, by adopting the above structure, a stable tearing action can be performed, preventing damage to the outer casing 5 caused by excessive tearing force.

[0142] (Method for measuring the average elongation of an elastic component)

[0143] Separate the side joint 8 of the shorts-type absorbent article and remove the absorbent body 4, then cut out the abdominal region 5a and the back region 5b of the outer body 5. Next, cut parallel to the transverse Y at a position 25mm along the longitudinal X from the waist opening end Wa of the abdominal region 5a and the back region 5b, thus cutting out the waist elastic region 5f and the leg elastic region 5g.

[0144] Then, the lengths of the elastic components 10 in each cut area of ​​the shorts-type absorbent article in its extended state are measured. Based on the measurements, the average length of all elastic components 10 in their maximum extended state in each area 5f and 5g is calculated.

[0145] Using a suitable solvent such as ethyl acetate, all elastic components 10 fixed to regions 5f and 5g by adhesives or the like are removed from the other components of the outer casing 5, and the lengths of the elastic components 10 at their natural lengths in each region 5f and 5g are measured. Based on the measured values, the average length of all elastic components 10 at their natural lengths in each region 5f and 5g is calculated.

[0146] In each region 5f and 5g, the average length of the elastic member 10 in the extended state is calculated as the ratio of the average length of the elastic member 10 in the natural length, and this ratio is used as the average elongation rate of the elastic member 10 in each region 5f and 5g.

[0147] The average elongation of the plurality of elastic components 10 in the waist stretching region 5f is preferably 120% or more, more preferably 130% or more, more preferably 500% or less, and more preferably 450% or less.

[0148] The average elongation of the plurality of elastic components 10 in the leg-side stretchable region 5g is preferably 150% or more, more preferably 180% or more, more preferably 550% or less, and more preferably 500% or less.

[0149] From the viewpoint of effectively obtaining the above-mentioned effects, the ratio of the average elongation of the plurality of elastic members 10 in the waist extension region 5f to the average elongation of the plurality of elastic members 10 in the leg side extension region 5g is preferably 20% or more, more preferably 30% or more, more preferably 90% or less, and more preferably 80% or less.

[0150] [Top view example of the structure of a bond strength reducing agent]

[0151] From the viewpoint of achieving a more stable tearing action, the bonding strength reducing agent 9 preferably has the following structure when viewed from above.

[0152] like Figure 3 As shown, the bonding strength reducing agent 9 preferably has a uniform line width. This allows the width b1 in the transverse Y direction of the intersection of the first cross-sealing portion S1 and the intersection 9s of the bonding strength reducing agent 9, and the width b2 in the transverse Y direction of the intersection of the second cross-sealing portion S2 and the intersection 9s of the bonding strength reducing agent 9, to be substantially the same.

[0153] The widths b1 and b2 of each intersection 9s in the transverse Y direction can be set as the average of the width of the intersection 9s at the upper end Sa and the width of the intersection 9s at the lower end Sb in the transverse Y direction.

[0154] The phrase “substantially the same” means that, when the minimum width of all intersections 9s is set to 100%, the width of each intersection 9s is less than 150%.

[0155] In the above structure, variations in the widths b1 and b2 of the cross portions 9s, which are weak joints, can be suppressed, as can variations in the joint strength of each cross sealing portion S1 and S2. This prevents caregivers from experiencing discomfort while tearing the shorts-type absorbent item. It also prevents damage to the outer casing 5 caused by caregivers applying excessive tearing force.

[0156] Furthermore, by stabilizing the widths b1 and b2 of the cross portion 9s, the significant reduction in the bonding strength of the cross sealing portions S1 and S2 can be suppressed, and the peeling of the side joint portion 8 during wearing can be prevented more reliably.

[0157] In addition, such as Figure 5 As shown in the example, when the multiple sealing parts S include 3 or more n intersecting sealing parts S1, S2, ..., Sn, it is preferable that the width of all the intersecting sealing parts S1, S2, ..., Sn in the transverse Y direction of the intersection 9s of the bonding strength reducing agent 9 is substantially the same.

[0158] Therefore, in addition to improving the ease of tearing in the longitudinal X direction, it can also improve the stability of the tearing action.

[0159] Specifically, the width of the cross portion 9s in the transverse Y direction is preferably 5% or more, more preferably 10% or more, more preferably 60% or less, and more preferably 50% or less, relative to the first dimension D1 of the cross sealing portion.

[0160] The width of the cross portion 9s in the transverse Y direction is preferably 0.1 mm or more, more preferably 0.2 mm or more, preferably 1.5 mm or less, and more preferably 1.2 mm or less.

[0161] The dimensions of the cross portion 9s and the cross sealing portion are measured in their maximum elongation state.

[0162] Furthermore, the bonding strength reducing agent 9 is not limited to, for example... Figure 3 , Figure 5 The structure shown can extend in a straight line, or it can be curved.

[0163] In particular, such as Figure 6 As shown in (A) and (B), when the bonding strength reducing agent 9 is provided in a spiral or wavy curve shape in at least one of the ventral region 5a and the dorsal region 5b, it can also intersect with the first cross seal portion S1 and the second cross seal portion S2 as part of the spiral or wavy curve.

[0164] The spiral or wavy curve forming the bonding strength reducer 9 has multiple unit shapes 9a, 9b that are repeatedly arranged in one direction.

[0165] Figure 6 (A) represents an example where the curve of the bonding strength reducing agent 9 is spiral-shaped. Here, "spiral-shaped" refers to a shape in which a circular or near-elliptical shape is used as a unit shape 9a, and multiple unit shapes 9a are repeatedly arranged along one direction. Figure 6 In (A), the nearly elliptical unit shape 9a is repeatedly arranged in the horizontal Y direction. Furthermore, in Figure 6 In (A), each unit shape 9a is formed as a closed ring, but it can also be a part of a unit shape 9a connected to an adjacent unit shape 9a, and multiple unit shapes 9a are formed continuously.

[0166] Figure 6 (B) indicates an example where the curve of the bonding strength reducing agent 9 is wavy. Wavy means that a shape with convex undulations in one direction and its opposite direction is used as a unit shape 9b, and multiple unit shapes 9b are repeatedly arranged along other directions.

[0167] In this case, the longitudinal (X) dimension of the aforementioned unit shapes 9a and 9b is preferably larger than the transverse (Y) dimension. The dimensions of the unit shapes 9a and 9b are the dimensions of the unit shapes 9a and 9b that at least partially overlap with the side joint 8 or are adjacent to it. Furthermore, the longitudinal (X) dimension refers to the maximum longitudinal (X) dimension of the unit shape 9a and 9b, and the transverse (Y) dimension refers to the maximum transverse (Y) dimension of the unit shape 9a and 9b.

[0168] For example, in Figure 6 In the spiral curve shown in (A), the longitudinal dimension c1 of the unit shape 9a is greater than the transverse dimension c2.

[0169] Similarly, for example, in Figure 6 In the wavy curve illustrated in (B), the longitudinal dimension d1 of the unit shape 9b is greater than the transverse dimension d2 of the transverse dimension X.

[0170] Therefore, the unit shapes 9a and 9b become longer in the vertical direction X, making it easier to control the position of the intersection 9s more accurately.

[0171] [Specific examples of bond strength reducing agents]

[0172] The bonding strength reducing agent 9 can be any substance that can suppress the effects of heat applied during the sealing process, which is the forming process of the sealing part S, without particular limitation. The bonding strength reducing agent 9 preferably includes, for example, an oil, a high-melting-point resin with a melting point higher than that of the thermoplastic sheet 50, a hot melt adhesive, etc.

[0173] In addition to reducing the heat generated during the sealing process, from the viewpoint of joining the sheets together, the bonding strength reducing agent 9 preferably includes a hot melt adhesive. As a hot melt adhesive, for example, styrene-based (SIS, SBS, SEBS) or polyolefin-based materials can be used.

[0174] The method for preparing the bond strength reducer 9 can use commonly used methods without particular limitations, but applying the bond strength reducer 9 with a coating gun is preferred. This allows for easy control of the coating shape and basis weight of the bond strength reducer 9, and thus easy control of the bond strength.

[0175] [Structural example of the skin side panel of the outer casing]

[0176] Reference Figure 7In the waist region 8c, from the viewpoint of improving ease of tearing, the skin side sheet P constituting the skin-facing side of the outer body 5 is preferably made of spunbond nonwoven fabric. From the viewpoint of sheet formation, the spunbond nonwoven fabric preferably contains polyolefins such as polyethylene and polypropylene, which are thermoplastic resins mentioned above, and more preferably contains polypropylene. Examples of polypropylene include α-olefins.

[0177] From the viewpoint of reliably fusing fibers together to form a sheet, the spunbond nonwoven fabric used in the skin side panel P preferably includes a plurality of embossed portions 12. Embossed portions 12 are the parts where fibers are pressed and fused together. Examples of embossed portions 12 include those formed at intervals by thermal pressing using embossing rollers and flat rollers, embossed portions formed by ultrasonic welding, and embossed portions formed by intermittently applying hot air to partially fuse them together. From the viewpoint of high productivity and low equipment cost, embossed portions 12 are preferably formed by thermal pressing.

[0178] The planar shape of the embossed part 12 can be any shape, such as a circle, an ellipse, a polygon, or a similar shape.

[0179] The embossed portion 12 is preferably formed with a specific pattern, but it can also be formed with a random pattern. Figure 7 In the middle, the embossed parts 12 are arranged at approximately a certain interval (pitch) in the longitudinal direction X and the transverse direction Y, and each column along the transverse direction Y is staggered from the adjacent column by half a pitch.

[0180] In the embossed portion 12, the fibers are prone to breakage due to the heat treatment and / or processing during formation. Therefore, the bonding strength of the overlapping area of ​​the sealing portion S with the embossed portion 12 may be reduced compared to the non-overlapping area. Therefore, from the viewpoint of further improving the ease of tearing, it is preferable to position the first cross sealing portion S1 and the second cross sealing portion S2 with the embossed portion 12 in the following positional relationship.

[0181] Preferably, the first cross-sealing portion S1 and the second cross-sealing portion S2 do not overlap with the inner end portion Sc and the outer end portion Sd when viewed from above, and overlap with at least one embossed portion 12 other than the inner end portion Sc and the outer end portion Sd.

[0182] That is, in the first cross-sealing portion S1 and the second cross-sealing portion S2, the portion that overlaps with the embossed portion 12 when viewed from above is preferably not located at the inner end Sc and the outer end Sd, but between the inner end Sc and the outer end Sd.

[0183] By preventing the embossed portion 12 from overlapping with the inner end Sc and the outer end Sd, caregivers and others can avoid contact between their fingers and the inner end Sc and the outer end Sd when pulling up the shorts-type absorbent item during wearing, thus preventing the first cross-sealing portion S1 and the second cross-sealing portion S2 from peeling off. Furthermore, during wearing, even if the wearer's waist circumference changes significantly, it can prevent the application of a lateral Y force to the inner end Sc of the first cross-sealing portion S1 and the second cross-sealing portion S2, thus preventing them from peeling off. Therefore, by adopting this structure, peeling of the side joint 8 during wearing and during the wearing process can be prevented.

[0184] Furthermore, the first cross-sealing portion S1 and the second cross-sealing portion S2 overlap with at least one embossed portion 12, except for the inner end Sc and the outer end Sd. As a result, during the tearing action, the fibers break in the portion where the cross-sealing portions S1 and S2 overlap with the embossed portion 12, thereby enabling tearing. As a result, lateral tearing of the outer body 5 is less likely to occur during the tearing action.

[0185] [Structural examples when the number of layers of the outer casing at the side joint is different]

[0186] In this embodiment, such as Figure 4 As shown, the outer body 5 constituting the side joint 8 has a folded-back structure, and the side joint 8 has multiple regions with different numbers of thermoplastic sheets 50 layers.

[0187] That is, in this embodiment, the side joint 8 has a first stacked region T1 on which three or more thermoplastic sheets 50 are stacked, and a second stacked region T2 on which fewer thermoplastic sheets 50 are stacked than in the first stacked region T1. As a thermoplastic sheet 50, the first stacked region T1 includes a first skin side sheet P1 forming the skin-facing surface. As a thermoplastic sheet 50, the second stacked region T2 includes a second skin side sheet P2 forming the skin-facing surface. In this embodiment, the first stacked region T1 corresponds to the area where the outer body 5 is folded back, and the skin side sheet P of the waist region 8c corresponds to the first skin side sheet P1.

[0188] exist Figure 4 In the example shown, the first layered region T1 of the ventral region 5a consists of three layers: an outer layer 51 that is not folded back, an inner layer 52 that is not folded back, and an outer layer 51 that is folded back. The first layered region T1 of the dorsal region 5b also consists of the same three layers. Thus, the first layered region T1 consists of a total of 6 layers. In the first layered region T1, the first skin lateral sheet P1 is composed of the outer layer 51 that is folded back.

[0189] exist Figure 4In the example shown, the second layered region T2 of the ventral region 5a consists of two layers: an outer layer 51 that has not been folded back and an inner layer 52 that has not been folded back. The second layered region T2 of the dorsal region 5b also consists of the same two layers. Thus, the second layered region T2 consists of a total of four layers. In the second layered region T2, the second skin lateral sheet P2 consists of the inner layer 52 that has not been folded back.

[0190] In the above structure, the first laminated region T1 has more layers than the second laminated region T2, and therefore the amount of thermoplastic resin is also greater. Consequently, the amount of resin that can be heat-fused is greater in the first laminated region T1 compared to the second laminated region T2, making it easier to achieve a higher bonding strength in the sealing portion S.

[0191] Therefore, in this embodiment, by using first skin side sheet P1 and second skin side sheet P2 with different structures, the bonding strength of the first layered region T1 and the second layered region T2 can be adjusted, thereby improving tear resistance.

[0192] (Area percentage of embossed areas in a skin profile)

[0193] In this embodiment, it is preferable that the first skin side sheet P1 and the second skin side sheet P2 are each made of spunbond nonwoven fabric containing a plurality of embossed portions 12.

[0194] In this case, it is preferable that the first skin side sheet P1 and the second skin side sheet P2 are made of spunbond nonwoven fabrics with different area ratios of the embossed portions 12, i.e., the ratio of the total area occupied by the plurality of embossed portions 12 in the region to the total area of ​​the specified region. Specifically, it is preferable that the area ratio of the embossed portions 12 in the first skin side sheet P1 is higher than that in the second skin side sheet P2.

[0195] The area ratio of the embossed portions 12 in the spunbond nonwoven fabric is measured in an area containing a sufficient number of embossed portions 12, for example, in a 20mm × 20mm square area of ​​the spunbond nonwoven fabric. Furthermore, the area occupied by each embossed portion 12 can be identified as a series of areas where thermal bonding of the fibers is observed. Additionally, the aforementioned distance measurement is performed in the unfolded, elongated state.

[0196] As described above, the bonding strength of the sealing portion S decreases in the embossed portion 12. Therefore, in the first laminated region T1 with a large number of layers, by increasing the area ratio of the embossed portion 12, the bonding strength of the sealing portion S in the first laminated region T1 can be suppressed from increasing. As a result, the difference in bonding strength between the first laminated region T1 and the second laminated region T2 can be reduced, and the overall bonding strength of the side joint 8 can be made more stable. Therefore, the tear resistance of the side joint 8 can be improved.

[0197] The area ratio of the embossed portion 12 of the first skin side plate P1 is preferably 5% or more, more preferably 7% or more, more preferably 20% or less, and more preferably 17% or less.

[0198] The area ratio of the embossed portion 12 of the second skin side plate P2 is preferably 3% or more, more preferably 5% or more, more preferably 17% or less, and more preferably 15% or less.

[0199] (Melting point of the skin side panel)

[0200] As another example, it is preferable that the melting point of the first skin side sheet P1 is higher than that of the second skin side sheet P2.

[0201] Compared to thermoplastic sheets with low melting points, thermoplastic sheets with high melting points are less prone to heat welding during the same sealing process, leading to a decrease in bond strength. Therefore, in the first laminated region T1 with a large number of layers, increasing the melting point of the first skin side sheet P1 can suppress the increase in bond strength of the sealing portion S in the first laminated region T1. This reduces the difference in bond strength between the first laminated region T1 and the second laminated region T2, resulting in more stable overall bond strength of the side joint 8. Consequently, the ease of tearing the side joint 8 can be improved.

[0202] The melting point of the first skin side sheet P1 is preferably 125°C or higher, more preferably 155°C or higher, more preferably 260°C or lower, and more preferably 250°C or lower.

[0203] The melting point of the second skin side sheet P2 is preferably 123°C or higher, more preferably 125°C or higher, more preferably 180°C or lower, and more preferably 170°C or lower.

[0204] (Weight of the skin patch)

[0205] As another example, it is preferable that the weight of the first skin side piece P1 is lower than the weight of the second skin side piece P2.

[0206] In a high-basis-weight thermoplastic sheet 50, the amount of thermoplastic resin also increases, making it easier for the bonding strength of the sealing portion S to increase. Therefore, in the first laminate region T1 with a large number of layers, by reducing the basis weight of the first skin side sheet P1, it is possible to suppress the increase in the bonding strength of the sealing portion S in the first laminate region T1. As a result, the difference in bonding strength between the first laminate region T1 and the second laminate region T2 can be reduced, and the overall bonding strength of the side joint 8 can be made more stable. Therefore, the tear resistance of the side joint 8 can be improved.

[0207] The preferred weight of the first skin patch P1 is 10g / m². 2 The above, preferably 12g / m 2 The above is preferably 30g / m 2The following is more preferably 25g / m 2 the following.

[0208] The preferred weight of the second skin patch P2 is 12g / m². 2 The above, preferably 14g / m 2 The above is preferably 40g / m 2 The following is more preferably 30g / m 2 the following.

[0209] <Second Implementation>

[0210] In the first embodiment described above, the structure of only folding back the outer layer 51 as the folding-back structure of the outer body 5 was described, but it is not limited thereto.

[0211] In this embodiment, such as Figure 8 As shown, the outer layer 51 and the inner layer 52 can also be folded back.

[0212] Furthermore, in the following second to fourth embodiments, the same reference numerals are used for the same structures as in the first embodiment described above, and the descriptions are omitted.

[0213] exist Figure 8 In the example shown, the outer sheet 51 and the inner sheet 52 are folded back from the waist opening end Wa towards the skin side. The leg-side ends of the folded-back outer sheet 51 and the inner sheet 52 are positioned approximately at the same location in the longitudinal direction X.

[0214] In the waist region 8c, among the multiple thermoplastic sheets 50 of the outer body 5, the skin side sheet P that forms the skin-facing side is a folded-back outer sheet 51, and the adjacent sheet Q that is adjacent to the skin side sheet P is a folded-back inner sheet 52.

[0215] In this case, similar to the first embodiment, the bonding strength reducing agent 9 is preferably disposed in the waist region 8c between the skin-side sheet P and the adjacent sheet Q. Figure 8 In the example shown, the bonding strength reducing agent 9 is disposed between the folded-back outer layer 51 and the adjacent folded-back inner layer 52. Therefore, by disposing the bonding strength reducing agent 9 near the bonding interface of the side bonding portion 8, the bonding strength of the intersection 9s can be effectively reduced.

[0216] Furthermore, from the viewpoint of further improving the ease of tearing, it is preferable that the penetration depth of the bonding strength reducing agent 9 in the skin side sheet P is deeper than the penetration depth of the bonding strength reducing agent 9 in the adjacent sheet Q.

[0217] In addition, Figure 8In the example shown, the bonding strength reducing agent 9 is disposed in the dorsal region 5b, but as mentioned above, it can also be disposed in the ventral region 5a, or both the ventral region 5a and the dorsal region 5b.

[0218] Similarly to the first embodiment, in this embodiment, the side joint 8 also has: a first lamination region T1, which has three or more thermoplastic sheets 50 including the first skin side sheet P1; and a second lamination region T2, which has fewer thermoplastic sheets 50 including the second skin side sheet P2 than the first lamination region T1. In this example, the first lamination region T1 corresponds to the area where the outer body 5 is folded back, and the skin side sheet P of the waist region 8c corresponds to the first skin side sheet P1.

[0219] exist Figure 8 In the example shown, the first layered region T1 of the ventral region 5a consists of four layers: an outer layer 51 that is not folded back, an inner layer 52 that is not folded back, an inner layer 52 that is folded back, and an outer layer 51 that is folded back. The first layered region T1 of the dorsal region 5b also consists of the same four layers. Thus, the first layered region T1 consists of a total of 8 layers. In the first layered region T1, the first skin lateral sheet P1 is composed of the outer layer 51 that is folded back.

[0220] exist Figure 8 In the example shown, the second layered region T2 of the ventral region 5a consists of two layers: an outer layer 51 that has not been folded back and an inner layer 52 that has not been folded back. The second layered region T2 of the dorsal region 5b also consists of the same two layers. Thus, the second layered region T2 consists of a total of four layers. In the second layered region T2, the second skin lateral sheet P2 consists of the inner layer 52 that has not been folded back.

[0221] In this embodiment, from the viewpoint of making the overall bonding strength of the side joint 8 more stable, it is also preferable to set the first skin side piece P1 and the second skin side piece P2 as follows.

[0222] For example, the first skin side sheet P1 and the second skin side sheet P2 are preferably made of spunbond nonwoven fabric containing a plurality of embossed portions 12. From the viewpoint of making the overall bonding strength of the side joint 8 more stable, the area ratio of the embossed portions 12 in the first skin side sheet P1 is preferably greater than the area ratio of the embossed portions 12 in the second skin side sheet P2.

[0223] For example, in this embodiment, from the viewpoint of making the overall bonding strength of the side joint 8 more stable, the distance between the embossed portions 12 in the first skin side piece P1 is preferably smaller than the distance between the embossed portions 12 in the second skin side piece P2.

[0224] For example, in this embodiment, from the viewpoint of making the overall bonding strength of the side joint 8 more stable, the melting point of the first skin side piece P1 is preferably higher than that of the second skin side piece P2.

[0225] For example, in this embodiment, it is also preferable that the weight of the first skin side sheet P1 is lower than that of the second skin side sheet P2.

[0226] In the shorts-type absorbent article with side joint 8 of this embodiment, in addition to the above-described structure, the bonding strength reducing agent 9 and the first cross-sealing part S1 and the second cross-sealing part S2 also have the same structure as in the first embodiment, thereby taking into account both preventing peeling during wearing and ease of tearing when discarded.

[0227] <Third Implementation>

[0228] The structure of the outer casing 5 with the fold-back structure is not limited to the examples described above. For example, the positions of the end of the fold-back region of the outer layer 51, i.e., the fold-back end 51a, and the end of the fold-back region of the inner layer 52, i.e., the fold-back end 52a, may also be different in the longitudinal direction X.

[0229] exist Figure 9 In the example shown, the folded-back end 52a of the inner layer 52 is located on the waist side in the longitudinal direction X, which is closer to the folded-back end 51a of the outer layer 51.

[0230] exist Figure 9 In the example shown, in the waist region 8c, both the outer sheet 51 and the inner sheet 52 are folded back. In this case, the skin side sheet P that forms the opposite skin surface is the folded-back outer sheet 51, and the adjacent sheet Q next to the skin side sheet P is the folded-back inner sheet 52.

[0231] In this case, similar to the first embodiment, the bonding strength reducing agent 9 is preferably disposed in the waist region 8c between the skin-side sheet P and the adjacent sheet Q. Figure 9 In the example shown, the bonding strength reducing agent 9 is disposed between the folded-back outer sheet 51 and the adjacent folded-back inner sheet 52.

[0232] Furthermore, from the viewpoint of further improving the ease of tearing, it is preferable that the penetration depth of the bonding strength reducing agent 9 in the skin side sheet P is deeper than the penetration depth of the bonding strength reducing agent 9 in the adjacent sheet Q.

[0233] In addition, Figure 9 In the example shown, the bonding strength reducing agent 9 is disposed in the ventral region 5a, but as mentioned above, it can also be disposed in the dorsal region 5b, or both the ventral region 5a and the dorsal region 5b.

[0234] Similarly to the second embodiment, in this embodiment, the side joint 8 also has a first stacked region T1 on which three or more thermoplastic sheets 50, including the first skin side sheet P1, are stacked, and a second stacked region T2 on which fewer thermoplastic sheets 50, including the second skin side sheet P2, are stacked. In this example, the first stacked region T1 corresponds to the area where the outer body 5 is folded back, and the skin side sheet P of the waist region 8c corresponds to the first skin side sheet P1.

[0235] Furthermore, in this embodiment, the first stacked region T1 includes regions with different numbers of thermoplastic sheets 50 stacked together. That is, the first stacked region T1 includes a leg-side stacked region T12 adjacent to the second stacked region T2 and having more thermoplastic sheets 50 stacked thereon than the second stacked region T2, and a waist-side stacked region T11 having more thermoplastic sheets 50 stacked thereon than the leg-side stacked region T12.

[0236] exist Figure 9 In the example shown, the waist region 8c is contained within the waist-side stacked region T11.

[0237] exist Figure 9 In the example shown, the waist-side laminated region T11 of the ventral region 5a consists of four layers: an outer layer 51 that is not folded back, an inner layer 52 that is not folded back, an inner layer 52 that is folded back, and an outer layer 51 that is folded back. The waist-side laminated region T11 of the dorsal region 5b also consists of the same four layers. Thus, the waist-side laminated region T11 consists of a total of eight layers.

[0238] Furthermore, the leg-side laminated region T12 of the ventral region 5a consists of three layers: an outer layer 51 that is not folded back, an inner layer 52 that is not folded back, and an outer layer 51 that is folded back. The leg-side laminated region T12 of the dorsal region 5b also consists of the same three layers. Thus, the leg-side laminated region T12 consists of a total of six layers.

[0239] In addition, the first skin side sheet P1 of both the waist side layered region T11 and the leg side layered region T12 is composed of the outer layer sheet 51 that has been folded back.

[0240] exist Figure 9 In the example shown, the second layered region T2 of the ventral region 5a consists of two layers: an outer layer 51 that has not been folded back and an inner layer 52 that has not been folded back. The second layered region T2 of the dorsal region 5b also consists of the same two layers. Thus, the second layered region T2 consists of a total of four layers. In the second layered region T2, the second skin lateral sheet P2 consists of the inner layer 52 that has not been folded back.

[0241] In this embodiment, from the viewpoint of making the overall bonding strength of the side joint 8 more stable, it is also preferable to set the first skin side piece P1 and the second skin side piece P2 as follows.

[0242] For example, the first skin side sheet P1 and the second skin side sheet P2 are preferably made of spunbond nonwoven fabric containing a plurality of embossed portions 12. From the viewpoint of making the bonding strength of the entire side joint 8 more stable, the area ratio of the embossed portions 12 in the first skin side sheet P1 is preferably greater than the area ratio of the embossed portions 12 in the second skin side sheet P2.

[0243] For example, in this embodiment, from the viewpoint of making the overall bonding strength of the side joint 8 more stable, the distance between the embossed portions 12 in the first skin side piece P1 is preferably smaller than the distance between the embossed portions 12 in the second skin side piece P2.

[0244] For example, in this embodiment, from the viewpoint of making the overall bonding strength of the side joint 8 more stable, the melting point of the first skin side piece P1 is preferably higher than that of the second skin side piece P2.

[0245] For example, in this embodiment, it is also preferable that the weight of the first skin side sheet P1 is lower than that of the second skin side sheet P2.

[0246] In the shorts-type absorbent article with side joint 8 of this embodiment, in addition to the above-described structure, the bonding strength reducing agent 9 and the first cross-sealing part S1 and the second cross-sealing part S2 also have the same structure as in the first embodiment, thereby taking into account both preventing peeling during wearing and ease of tearing when discarded.

[0247] <Fourth Implementation>

[0248] The shorts-type absorbent article of the present invention is not limited to the example in which the outer body 5 has a folded-back structure as in the embodiments described above; the outer body 5 may also not have a folded-back structure.

[0249] In this embodiment, such as Figure 10 As shown, it is also possible that the outer layer 51 and the inner layer 52 are not folded back, and the ends of these layers are aligned with the waist opening end Wa.

[0250] That is, in this example, the outer body 5 is constructed with the same number of layers. For example, the ventral region 5a and the dorsal region 5b are composed of two layers, an outer layer 51 and an inner layer 52, respectively.

[0251] That is, in the waist region 8c of the side joint 8, among the multiple thermoplastic sheets 50 of the outer body 5, the skin side sheet P that forms the skin-facing side is the inner layer sheet 52, and the adjacent sheet Q adjacent to the skin side sheet P is the outer layer sheet 51.

[0252] In this case, similar to the first embodiment, from the viewpoint of effectively reducing the bonding strength of the intersection 9s, the bonding strength reducing agent 9 is preferably disposed in the waist region 8c between the skin side piece P and the adjacent piece Q. Figure 8 In the example shown, the bonding strength reducing agent 9 is disposed between the inner sheet 52 and the adjacent outer sheet 51.

[0253] Furthermore, from the viewpoint of more effectively reducing the bonding strength of the cross portion 9s, it is preferable that the penetration depth of the bonding strength reducing agent 9 in the skin side sheet P is deeper than the penetration depth of the bonding strength reducing agent 9 in the adjacent sheet Q.

[0254] Among them, Figure 10 In the example shown, the bonding strength reducing agent 9 is disposed in both the ventral region 5a and the dorsal region 5b, but as mentioned above, it can also be disposed in either the ventral region 5a or the dorsal region 5b.

[0255] Furthermore, in this embodiment, from the viewpoint of making the overall bonding strength of the side joint 8 more stable, the skin side piece P is preferably made of the same nonwoven fabric in the entire side joint 8.

[0256] For example, the skin side panel P is preferably made of spunbond nonwoven fabric containing a plurality of embossed portions 12, and preferably the area ratio of the embossed portions 12 in the entire side joint 8 is substantially constant. Here, "the area ratio of the embossed portions 12 in the entire side joint 8 is substantially constant" means that when comparing the area ratios of 10 or more embossed portions 12 in the side joint 8, the highest area ratio is below 110% when the lowest area ratio is set to 100%.

[0257] For example, in this embodiment, it is preferable that the melting point of the skin side piece P is substantially constant throughout the side joint 8. "The melting point of the skin side piece P is substantially constant throughout the side joint 8" means that when comparing the melting points of the skin side pieces P at more than 10 locations in the side joint 8, the highest melting point is below 110% when the lowest melting point is set to 100%.

[0258] For example, in this embodiment, it is preferable that the weight of the skin side piece P is substantially constant throughout the side joint 8. "The weight of the skin side piece P is substantially constant throughout the side joint 8" means that when comparing the weights of the skin side pieces P at 10 or more locations in the side joint 8, the highest weight is below 110% when the lowest weight is set to 100%.

[0259] In the shorts-type absorbent article with side joint 8 of this embodiment, in addition to the above-described structure, the bonding strength reducing agent 9 and the first cross-sealing part S1 and the second cross-sealing part S2 also have the same structure as in the first embodiment, thereby taking into account both preventing peeling during wearing and ease of tearing when discarded.

[0260] <Other Implementation Methods>

[0261] The embodiments of the present invention have been described above, but the present invention is not limited to the above embodiments, and various modifications can be made without departing from the spirit of the present invention.

[0262] For example, in the above embodiment, the outer body 5 is described as having a ventral region 5a, a dorsal region 5b, and a crotch region 5c, but it is not limited thereto. For example, the outer body 5 may also have a structure in which the ventral and dorsal regions are separated, without a crotch region.

[0263] The shorts-type absorbent article of the present invention may not be a disposable diaper for infants; for example, it may be a disposable diaper for adults or children. Furthermore, the shorts-type absorbent article of the present invention can be any type of absorbent article worn on the lower body, and does not necessarily have to be a disposable diaper. Examples of such shorts-type absorbent articles include shorts-type sanitary napkins.

[0264] In relation to the above-described embodiments, the present invention also discloses the following absorbent articles.

[0265] <1>

[0266] A shorts-type absorbent article includes: an absorbent body; an outer garment disposed on the non-skin-facing side of the absorbent body, including a ventral region and a dorsal region located on both sides longitudinally, and formed by stacking multiple thermoplastic sheets; and a pair of side joints joining the ventral region and the dorsal region of the outer garment at lateral edges orthogonal to the longitudinal direction, wherein...

[0267] The pair of side joints have: a waist end and a leg end forming the two ends of the longitudinal direction; a waist region within 25 mm from the waist end in the longitudinal direction; and a plurality of sealing portions arranged along the longitudinal direction.

[0268] The plurality of sealing portions extend laterally between the inner and outer ends, and are arranged at intervals of a second dimension smaller than the first dimension between the inner and outer ends.

[0269] At least one of the pair of side joints further comprises: a bonding strength reducing agent disposed linearly between the thermoplastic sheets; and a plurality of intersecting seals included in the plurality of seals, arranged continuously in the longitudinal direction in the waist region, having intersecting seals that intersect with the bonding strength reducing agent outside the inner and outer ends.

[0270] The plurality of cross-sealing portions include: a first cross-sealing portion, wherein the cross distance between the inner end and the cross portion is less than the second dimension; and a second cross-sealing portion, which is adjacent to the first cross-sealing portion on the leg end side, wherein the cross distance is less than the cross distance of the first cross-sealing portion.

[0271] <2>

[0272] According to the shorts-type absorbent article described in <1>, wherein,

[0273] The bonding strength reducing agent comprises at least one of oil, high melting point resin and hot melt adhesive.

[0274] <3>

[0275] According to the shorts-type absorbent article described in <2>, wherein,

[0276] The bonding strength reducing agent comprises a hot melt adhesive.

[0277] <4>

[0278] The shorts-type absorbent article according to any one of <1> to <3>, wherein,

[0279] The plurality of thermoplastic sheets include skin-facing sheets forming the skin-facing surface of the outer garment in the waist region and adjacent sheets adjacent to the skin-facing sheets.

[0280] The bonding strength reducing agent is disposed between the skin side sheet and the adjacent sheet.

[0281] <5>

[0282] According to the shorts-type absorbent article described in <4>, wherein,

[0283] The bonding strength reducing agent is disposed in the waist region between the skin side sheet and the adjacent sheet.

[0284] <6>

[0285] According to the shorts-type absorbent articles described in <4> or <5>, wherein,

[0286] The penetration depth of the bonding strength reducing agent in the skin side panel is deeper than the penetration depth of the bonding strength reducing agent in the adjacent panel.

[0287] <7>

[0288] The shorts-type absorbent article according to any one of <1> to <6>, wherein,

[0289] The second dimension is smaller than the difference between the first dimension and the intersection distance of the second intersection seal.

[0290] <8>

[0291] The shorts-type absorbent article according to any one of <1> to <7>, wherein,

[0292] The first cross-sealing portion is located at the position closest to the waist end of the plurality of sealing portions.

[0293] <9>

[0294] The shorts-type absorbent article according to any one of <1> to <8>, wherein,

[0295] The ventral region and the dorsal region are respectively provided with telescopic regions in which multiple elastic members are arranged in the laterally extending region.

[0296] The average elongation of the plurality of elastic components in the waist region is less than the average elongation of the plurality of elastic components in the region closer to the end of the leg than the waist region.

[0297] <10>

[0298] According to the shorts-type absorbent article described in <9>, wherein...

[0299] The average elongation of the plurality of elastic members in the waist region is 20% or more and 90% or less, preferably 30% or more and 80% or less, relative to the average elongation of the plurality of elastic members in the region closer to the leg end than the waist region.

[0300] <11>

[0301] The shorts-type absorbent article according to any one of <1> to <10>, wherein,

[0302] The bonding strength reducing agent is continuous between the intersections of the first cross-sealing portion and the second cross-sealing portion.

[0303] <12>

[0304] The shorts-type absorbent article according to any one of <1> to <11>, wherein,

[0305] The plurality of cross-sealing portions include three or more cross-sealing portions that extend from the waist end side to the leg end side and the cross distance decreases monotonically.

[0306] <13>

[0307] The shorts-type absorbent article according to any one of <1> to <12>, wherein,

[0308] The bonding strength reducing agent is disposed in a spiral or wavy curve on at least one of the ventral region and the dorsal region.

[0309] <14>

[0310] The shorts-type absorbent article according to any one of <1> to <13>, wherein,

[0311] The bonding strength reducing agent is disposed with a uniform linewidth.

[0312] <15>

[0313] The shorts-type absorbent article according to any one of <1> to <14>, wherein,

[0314] The plurality of cross-sealing portions are arranged in a manner that extends from the waist end side to the leg end side in a region of more than 10 mm in the longitudinal direction, with the cross distance decreasing monotonically.

[0315] <16>

[0316] The shorts-type absorbent article according to any one of <1> to <15>, wherein,

[0317] Each of the pair of side joints has the joint strength reducing agent and the plurality of cross-sealing parts.

[0318] <17>

[0319] The shorts-type absorbent article according to any one of <1> to <16>, wherein,

[0320] Multiple elastic members extending laterally are respectively disposed in the ventral region and the dorsal region.

[0321] The plurality of sealing portions can extend in the lateral direction to more than 1.2 times the first dimension.

[0322] <18>

[0323] The shorts-type absorbent article according to any one of <1> to <17>, wherein,

[0324] The plurality of thermoplastic sheets include skin side sheets made of spunbond nonwoven fabric containing a plurality of embossed portions that form the skin-facing side of the outer garment in the waist region.

[0325] The first cross-sealing portion and the second cross-sealing portion overlap with at least one of the embossed portions, respectively, outside the inner end portion and the outer end portion.

[0326] <19>

[0327] The shorts-type absorbent article according to any one of <1> to <18>, wherein,

[0328] The ventral region and the dorsal region each have: a first layered region having three or more thermoplastic sheets, each including a first skin side sheet forming the skin-facing surface; and a second layered region having fewer thermoplastic sheets, each including a second skin side sheet forming the skin-facing surface, than the number in the first layered region.

[0329] The first skin side panel and the second skin side panel are each made of spunbond nonwoven fabric containing multiple embossed portions.

[0330] The area ratio of the plurality of embossed portions in the first skin side sheet is higher than that of the plurality of embossed portions in the second skin side sheet.

[0331] <20>

[0332] The shorts-type absorbent article according to any one of <1> to <19>, wherein,

[0333] Regarding each of the portions that divide the pair of side joints into three parts in the longitudinal direction, the transverse breaking strength of the outer body is greater than the transverse peel strength of the plurality of seals.

[0334] <21>

[0335] The shorts-type absorbent article according to any one of <1> to <20>, wherein,

[0336] The ventral region and the dorsal region each have: a first layered region having three or more thermoplastic sheets, each including a first skin side sheet forming the skin-facing surface; and a second layered region having fewer thermoplastic sheets, each including a second skin side sheet forming the skin-facing surface, than the number in the first layered region.

[0337] The first skin side panel and the second skin side panel are each made of spunbond nonwoven fabric containing multiple embossed portions.

[0338] The distance between the plurality of embossed portions in the first skin side sheet is smaller than the distance between the plurality of embossed portions in the second skin side sheet.

[0339] <22>

[0340] The shorts-type absorbent article according to any one of <1> to <21>, wherein,

[0341] The ventral region and the dorsal region each have: a first layered region having three or more thermoplastic sheets, each including a first skin side sheet forming the skin-facing surface; and a second layered region having fewer thermoplastic sheets, each including a second skin side sheet forming the skin-facing surface, than the number in the first layered region.

[0342] The melting point of the first skin side sheet is higher than that of the second skin side sheet.

[0343] <23>

[0344] The shorts-type absorbent article according to any one of <1> to <22>, wherein,

[0345] The ventral region and the dorsal region each have: a first layered region having three or more thermoplastic sheets, each including a first skin side sheet forming the skin-facing surface; and a second layered region having fewer thermoplastic sheets, each including a second skin side sheet forming the skin-facing surface, than the number in the first layered region.

[0346] The weight of the first skin side sheet is lower than that of the second skin side sheet.

[0347] Explanation of reference numerals in the attached figures

[0348] 1...Short-style absorbent items (disposable diapers, cloth diapers)

[0349] 4...Absorbent Subject

[0350] 5...outer body

[0351] 5a……ventral region

[0352] 5b...dorsal region

[0353] 50... Thermoplastic sheet

[0354] 8……Side joint

[0355] 8a……waist end

[0356] 8b……Leg end

[0357] 9... Bond strength reducing agent

[0358] S...Sealing part

[0359] S1……First Cross Sealing Section

[0360] S2……Second Cross Sealing Section

[0361] Sc……inner end

[0362] Sd……outer end.

Claims

1. A shorts-type absorbent article, comprising: Absorbent subject; An outer casing, disposed on the non-skin-facing side of the absorbent body, includes a ventral region and a dorsal region located on both sides longitudinally, and is composed of multiple thermoplastic sheets stacked together; and a pair of side joints joining the ventral region and the dorsal region of the outer casing at lateral edges orthogonal to the longitudinal direction. The shorts-type absorbent item is characterized by: The pair of side joints have: a waist end and a leg end forming the two ends of the longitudinal direction; a waist region within 25 mm from the waist end in the longitudinal direction; and a plurality of sealing portions arranged along the longitudinal direction. The plurality of sealing portions extend laterally between the inner and outer ends, and are arranged at intervals of a second dimension smaller than the first dimension between the inner and outer ends. At least one of the pair of side joints further comprises: a bonding strength reducing agent disposed linearly between the thermoplastic sheets; and a plurality of intersecting seals included in the plurality of seals, arranged continuously in the longitudinal direction in the waist region, having intersecting seals that intersect with the bonding strength reducing agent outside the inner and outer ends. The plurality of intersecting sealing portions include: a first intersecting sealing portion, wherein the intersecting distance between the inner end portion and the intersecting portion is smaller than the second dimension; The second cross-sealing portion is adjacent to the first cross-sealing portion on the leg end side, and the cross distance is less than or equal to the cross distance of the first cross-sealing portion. The plurality of thermoplastic sheets include skin-facing sheets forming the skin-facing surface of the outer garment in the waist region and adjacent sheets adjacent to the skin-facing sheets. The bonding strength reducing agent is disposed between the skin side sheet and the adjacent sheet.

2. The shorts-type absorbent article as described in claim 1, characterized in that: The bonding strength reducing agent comprises at least one of oil, high melting point resin and hot melt adhesive.

3. The shorts-type absorbent article as described in claim 2, characterized in that: The bonding strength reducing agent comprises a hot melt adhesive.

4. The shorts-type absorbent article as described in any one of claims 1 to 3, characterized in that: The bonding strength reducing agent is disposed in the waist region between the skin side sheet and the adjacent sheet.

5. The shorts-type absorbent article as described in any one of claims 1 to 3, characterized in that: The penetration depth of the bonding strength reducing agent in the skin side panel is deeper than the penetration depth of the bonding strength reducing agent in the adjacent panel.

6. The shorts-type absorbent article as described in any one of claims 1 to 3, characterized in that: The second dimension is smaller than the difference between the first dimension and the intersection distance of the second intersection seal.

7. The shorts-type absorbent article as described in any one of claims 1 to 3, characterized in that: The first cross-sealing portion is located at the position closest to the waist end of the plurality of sealing portions.

8. The shorts-type absorbent article as described in any one of claims 1 to 3, characterized in that: The ventral region and the dorsal region are respectively provided with telescopic regions in which multiple elastic members are arranged in the laterally extending region. The average elongation of the plurality of elastic components in the waist region is less than the average elongation of the plurality of elastic components in the region closer to the end of the leg than the waist region.

9. The shorts-type absorbent article as described in claim 8, characterized in that: The average elongation of the plurality of elastic members in the waist region is 20% or more and 90% or less, preferably 30% or more and 80% or less, relative to the average elongation of the plurality of elastic members in the region closer to the leg end than the waist region.

10. The shorts-type absorbent article as described in any one of claims 1 to 3, characterized in that: The bonding strength reducing agent is continuous between the intersections of the first cross-sealing portion and the second cross-sealing portion.

11. The shorts-type absorbent article as described in any one of claims 1 to 3, characterized in that: The plurality of cross-sealing portions include three or more cross-sealing portions that extend from the waist end side to the leg end side and the cross distance decreases monotonically.

12. The shorts-type absorbent article as described in any one of claims 1 to 3, characterized in that: The bonding strength reducing agent is disposed in a spiral or wavy curve on at least one of the ventral region and the dorsal region.

13. The shorts-type absorbent article as described in any one of claims 1 to 3, characterized in that: The bonding strength reducing agent is disposed with a uniform linewidth.

14. The shorts-type absorbent article as described in any one of claims 1 to 3, characterized in that: The plurality of cross-sealing portions are arranged such that the cross distance decreases monotonically from the waist end side to the leg end side in a region of more than 10 mm in the longitudinal direction.

15. The shorts-type absorbent article as described in any one of claims 1 to 3, characterized in that: Each of the pair of side joints has the joint strength reducing agent and the plurality of cross-sealing parts.

16. The shorts-type absorbent article as described in any one of claims 1 to 3, characterized in that: Multiple elastic members extending laterally are respectively disposed in the ventral region and the dorsal region. The plurality of sealing portions can extend in the lateral direction to more than 1.2 times the first dimension.

17. The shorts-type absorbent article as claimed in any one of claims 1 to 3, characterized in that: The plurality of thermoplastic sheets include skin side sheets made of spunbond nonwoven fabric containing a plurality of embossed portions that form the skin-facing side of the outer garment in the waist region. The first cross-sealing portion and the second cross-sealing portion overlap with at least one of the embossed portions, respectively, outside the inner end portion and the outer end portion.

18. The shorts-type absorbent article as described in any one of claims 1 to 3, characterized in that: The ventral region and the dorsal region each have: a first layered region having three or more thermoplastic sheets, each including a first skin side sheet forming the skin-facing surface; and a second layered region having fewer thermoplastic sheets, each including a second skin side sheet forming the skin-facing surface, than the number in the first layered region. The first skin side panel and the second skin side panel are each made of spunbond nonwoven fabric containing multiple embossed portions. The area ratio of the plurality of embossed portions in the first skin side sheet is higher than that of the plurality of embossed portions in the second skin side sheet.

19. The shorts-type absorbent article as described in any one of claims 1 to 3, characterized in that: Regarding each of the portions that divide the pair of side joints into three parts in the longitudinal direction, the transverse breaking strength of the outer body is greater than the transverse peel strength of the plurality of seals.

20. The shorts-type absorbent article as described in any one of claims 1 to 3, characterized in that: The ventral region and the dorsal region each have: a first layered region having three or more thermoplastic sheets, each including a first skin side sheet forming the skin-facing surface; and a second layered region having fewer thermoplastic sheets, each including a second skin side sheet forming the skin-facing surface, than the number in the first layered region. The first skin side panel and the second skin side panel are each made of spunbond nonwoven fabric containing multiple embossed portions. The distance between the plurality of embossed portions in the first skin side sheet is smaller than the distance between the plurality of embossed portions in the second skin side sheet.

21. The shorts-type absorbent article as described in any one of claims 1 to 3, characterized in that: The ventral region and the dorsal region each have: a first layered region having three or more thermoplastic sheets, each including a first skin side sheet forming the skin-facing surface; and a second layered region having fewer thermoplastic sheets, each including a second skin side sheet forming the skin-facing surface, than the number in the first layered region. The melting point of the first skin side sheet is higher than that of the second skin side sheet.

22. The shorts-type absorbent article as described in any one of claims 1 to 3, characterized in that: The ventral region and the dorsal region each have: a first layered region having three or more thermoplastic sheets, each including a first skin side sheet forming the skin-facing surface; and a second layered region having fewer thermoplastic sheets, each including a second skin side sheet forming the skin-facing surface, than the number in the first layered region. The weight of the first skin side sheet is lower than that of the second skin side sheet.

Images