JP2023029256A - Underpants type absorbent article - Google Patents

Abstract

To provide an underpants type absorbent article which achieves both prevention of peeling in wearing motion and wearing and easiness of tearing at disposal.SOLUTION: The underpants type absorbent article according to an embodiment of the present invention includes an exterior body having an abdominal side region, a back side region, and a pair of side joining parts. At least one of the side joining parts has a plurality of seal parts each of that extends in a lateral direction and is disposed so as to be separated from each other in a longitudinal direction, and a bonding-strength-reducing agent extending in a linear shape. The plurality of seal parts include a first intersecting seal part and a second intersecting seal part that are disposed in a waist region and intersect the bonding-strength-reducing agent at a section other than an inner end part and an outer end part in plane view. In the side joining part that includes the first intersecting seal part and the second intersecting seal part, intersection angles α1, α2, α3, and α4 between the bonding-strength-reducing agent and the respective intersecting seal parts satisfy the following formula (1). 5 degrees<α1≤α2<α3≤α4<90 degrees (1)SELECTED DRAWING: Figure 3

Description

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

Pants-type absorbent articles generally include an absorbent body, an outer body, and side joints (side seals) where the outer body on the abdominal side and the outer body on the back side are joined at the side ends. ing. The waist portion of the pants-type absorbent article is formed by joining the outer covering body on the abdomen side and the outer covering body on the back side by the side joints.
On the other hand, after wearing the pants-type absorbent article, the side joints are sometimes torn off and discarded from the viewpoint of hygiene. For this reason, the side joints are required to have a function of not being peeled off during wearing (when putting on the pants-type absorbent article) and wearing, and of being able to be easily torn off when discarded.

From this point of view, in Patent Document 1, a strength reduction area portion in which a bonding strength reducing material for reducing the bonding strength is disposed at the bonding portion on both sides of the ventral portion and the dorsal portion of the exterior body, and a bonding A pant-type absorbent article is disclosed having non-reduced strength regions in which no strength-reducing material is disposed. In this document, the joints are arranged continuously in the longitudinal direction, and the strength reduction regions are arranged, for example, inside and/or outside the joints in the width direction.

In Patent Document 2, a joint strength reducing agent is disposed between sheets at the side joints, and more of the joint strength reducing agent is disposed in the outer portion in the width direction of the side joint than in the inner portion. A mold-wearing article is disclosed.

JP 2011-72577 A JP 2018-88945 A

Both of the techniques described in Patent Documents 1 and 2 adjust the joint strength of the side joints with a joint strength reducing agent, but prevent peeling during wearing and wearing, and tear easily during disposal. From this point of view, there is still room for improvement.

SUMMARY OF THE INVENTION An object of the present invention is to provide a pants-type absorbent article that can achieve both prevention of peeling during and during wear and tearability during disposal.

A pants-type absorbent article according to one aspect of the present invention comprises an absorbent main body and an outer body that includes a plurality of thermoplastic sheets and is disposed on the non-skin facing side of the absorbent main body. It has a longitudinal direction extending from the ventral side through the crotch to the dorsal side, and a lateral direction orthogonal to the longitudinal direction.
The exterior body is
a ventral region located on the ventral side of the wearer;
a dorsal region positioned on the dorsal side of the wearer;
It has a pair of side joints where the lateral side edges of the ventral region and the lateral side edges of the dorsal region are respectively joined.
The pair of side joints each have a waist end and a leg end, which constitute both ends in the longitudinal direction.
At least one of the side joints is
a plurality of seal portions each extending in the lateral direction and spaced apart in the longitudinal direction;
and a fusion bond strength reducing agent disposed between the thermoplastic sheets and extending linearly.
The plurality of seal portions are
including an inner end that is the laterally inner end and an outer end that is the laterally outer end, and
A seal portion disposed in a waist region positioned within 25 mm in the longitudinal direction from the waist end portion, and intersects with the fusion bonding strength reducing agent at portions other than the inner end portion and the outer end portion in plan view. A first cross seal and a second cross seal are included.
The first cross seal portion and the second cross seal portion are
They are arranged side by side in order from the waist end side toward the leg end side.
The side joint portion including the first cross seal portion and the second cross seal portion,
The intersection angle between the fusion strength reducing agent and the first cross seal portion on the waist end side and inward in the lateral direction is α1, and the fusion strength reduction agent and the first cross seal portion are: The laterally outer crossing angle on the leg end side is α2, and the laterally inner crossing angle on the waist end side between the fusion strength reducing agent and the second cross seal portion The following formula (1) is satisfied, where α3 is the crossing angle of the fusion bond strength reducing agent and the second cross seal portion on the leg end side and the laterally outer side as α4.
5 degrees < α1 ≤ α2 < α3 ≤ α4 < 90 degrees (1)

According to the underpants-type absorbent article of the present invention, it is possible to achieve both the prevention of peeling during and during wearing and the ease of tearing during disposal.

1 is a schematic perspective view showing a pants-type absorbent article according to a first embodiment of the present invention; FIG. FIG. 4 is a schematic plan view showing the side of the underpants-type absorbent article facing the skin, showing a mode in which the underpants-type absorbent article is unfolded and the elastic members of each part are stretched and spread flatly. FIG. . FIG. 4 is a schematic plan view showing side joints of the pants-type absorbent article. FIG. 4 is a schematic cross-sectional view of the side joint portion, showing a state in which a ventral region and a dorsal region are separated. It is a typical top view which shows the side joint part which concerns on the modification of the said embodiment. (A) and (B) are schematic plan views each showing a side joint according to a modification of the embodiment. It is a typical top view for demonstrating arrangement|positioning of the embossed part of the skin side sheet|seat of the said side joint part. FIG. 4 is a schematic cross-sectional view of a side joint portion of a pants-type absorbent article according to a second embodiment of the present invention, showing a state in which an abdominal area and a dorsal area are separated. FIG. 10 is a schematic cross-sectional view of a side joint portion of a pants-type absorbent article according to a third embodiment of the present invention, showing a state in which an abdominal area and a dorsal area are separated. FIG. 10 is a schematic cross-sectional view of a side joint portion of a pants-type absorbent article according to a fourth embodiment of the present invention, showing a state in which an abdominal area and a dorsal area are separated.

Hereinafter, embodiments of the present invention will be described with reference to the drawings.

<First Embodiment>
[Overall configuration of underpants-type disposable diaper]
1 and 2 show an underpants-type disposable diaper 1 as an underpants-type absorbent article according to a first embodiment of the present invention. The pants-type disposable diaper 1 is hereinafter referred to as the diaper 1 .

As shown in FIG. 1, the diaper 1 has a waist opening 1W and a pair of leg openings IL, and is worn around the waist and crotch of the wearer. The waist opening 1W has a waist opening end Wa. The diaper 1 has a longitudinal direction X and a transverse direction Y. As shown in FIG. The longitudinal direction X extends from the abdomen of the wearer through the crotch to the dorsal side. The lateral direction Y is orthogonal to the longitudinal direction X and corresponds to the lateral direction of the wearer. Further, as shown in FIG. 2 and the like, a direction perpendicular to the longitudinal direction X and the lateral direction Y of the diaper 1 is defined as a thickness direction Z. As shown in FIG.
In this specification, the "waist side" means the side in the longitudinal direction X near the waist opening end Wa of the waist opening 1W, and the "leg side" means the side in the longitudinal direction X from the waist opening end Wa. It means the far away side.
In this specification, the term “lateral direction Y inner side” means the side in the lateral direction Y that approaches the vertical center line CL that bisects the pants-type absorbent article (diaper 1) in the lateral direction Y. "Direction Y outside" means the side away from the longitudinal center line CL.
In this specification, regarding the thickness direction Z, the side close to the wearer's skin when wearing the pants-type absorbent article (diaper 1) is sometimes called the skin side, and the side close to the clothes is called the non-skin side. The term "skin-facing surface" refers to the surface of the pants-type absorbent article (diaper 1) or its constituent members facing the wearer's skin, that is, the surface relatively close to the wearer's skin. The term “non-skin facing surface” refers to the surface of the pants-type absorbent article (diaper 1) or its constituent members facing the opposite side (clothing side) of the skin facing surface, that is, relatively far from the wearer's skin. means face.

When the wearer puts on the diaper 1, first, the wearer puts the legs through the pair of leg openings 1L, pulls up the diaper 1 toward the body, and places the diaper 1 around the wearer's waist and crotch. In this specification, this series of actions is referred to as a "wearing action". The putting action may be performed not by the wearer of the diaper 1 but by a caregiver. For this reason, in this specification, the subject of the donning motion is defined as "a caregiver or the like".
Further, in this specification, the state in which the diaper 1 is arranged in a proper wearing position that is normally assumed by the wearer is referred to as "when worn".

As shown in FIGS. 1 and 2, the diaper 1 includes an absorbent main body 4 and an exterior body 5 arranged on the non-skin facing side of the absorbent main body 4 .
In addition, FIG. 2 shows a form in which the diaper 1 is unfolded, the elastic members of each part are stretched, and the diaper 1 is flattened so as to achieve the design dimensions in which the influence of the elastic members is completely eliminated. This mode is also referred to as the “deployed and stretched mode” of the diaper 1 . Unfolding the diaper 1 means separating the ventral region 5a and the dorsal region 5b of the side joints 8, which will be described later.

The absorbent main body 4 is fixed to the skin-facing surface side of the exterior body 5 . The absorbent main body 4 has at least an absorbent body 40, and may further have a topsheet 2, a backsheet (not shown), and the like. For example, the absorbent main body 4 has a configuration in which a backsheet, an absorbent body 40 and a topsheet 2 are laminated in the thickness direction Z. As shown in FIG. The absorbent body 40 includes a liquid-retaining absorbent core, and may further include a core wrap sheet covering the absorbent core.
Materials used in the respective components (back sheet, absorbent body 40, top sheet 2, etc.) included in the absorbent main body 4 can be those used in the relevant technical field without particular limitations.

The outer body 5 includes multiple thermoplastic sheets 50 . The exterior body 5 is configured as a laminate of a plurality of thermoplastic sheets 50, for example.
The thermoplastic sheet 50 is a sheet material mainly made of thermoplastic resin. The thermoplastic sheet 50 preferably contains 90% by mass or more of thermoplastic resin, more preferably 100% by mass of thermoplastic resin.
Examples of thermoplastic resins include polyolefins such as polyethylene and polypropylene; polyesters such as polyethylene terephthalate; polyamides such as nylon 6 and nylon 66; These 1 types can be used individually or in combination of 2 or more types. The thermoplastic fibers may be short fibers or long fibers. As thermoplastic fibers, core-sheath type or side-by-side type composite fibers, split fibers, modified cross-section fibers, heat-shrinkable fibers, and the like can also be used.

The outer body 5 has at least a ventral region 5a arranged on the ventral side of the wearer and a dorsal region 5b arranged on the dorsal side of the wearer. The outer body 5 of this embodiment further includes a crotch region 5c located between the abdominal region 5a and the dorsal region 5b and arranged in the wearer's crotch region. In this example, the ventral region 5a, the crotch region 5c, and the dorsal region 5b are arranged along the longitudinal direction X. As shown in FIG. Further, the outer body 5 has a shape constricted inward in the lateral direction Y in the crotch region 5c. Thereby, a leg opening 1L (see FIG. 1) is formed along the wearer's leg loop.
It is preferable that the outer edge of the exterior body 5 is configured line-symmetrically (left-right symmetrically) with respect to the longitudinal center line CL.

Furthermore, the exterior body 5 has a pair of side joints 8 where a side edge 5d in the lateral direction Y of the ventral region 5a and a side edge 5e in the lateral direction Y of the dorsal region 5b are respectively joined. . That is, the right side joint portion 8 has a structure in which the right side edge portion 5d of the ventral region 5a and the right side edge portion 5e of the dorsal region 5b are overlapped and joined in the thickness direction Z. . The left side joint portion 8 has a structure in which a left side edge portion 5d of the ventral region 5a and a left side edge portion 5e of the dorsal region 5b are overlapped in the thickness direction Z and joined.
The side joints 8 are preferably joined by heat sealing, ultrasonic sealing, or the like, as will be described later in detail.

[Structure of side joint]
As shown in FIG. 2, the pair of side joints 8 has a waist end 8a and a leg end 8b, which form both ends in the longitudinal direction X, respectively.
The waist end portion 8a is an end portion of the side joint portion 8 on the waist side.
The leg end portion 8b is an end portion of the side joint portion 8 on the leg side.
Each side joint portion 8 has a configuration extending in the longitudinal direction X from the waist end portion 8a to the leg end portion 8b as a whole.

The pair of side joints 8 extending from the waist end 8a to the leg end 8b form the abdominal region 5a and the dorsal region 5b into a tubular shape along the waist of the wearer, thereby forming the waist opening 1W of the diaper 1. and leg openings 1L are formed. It is preferable that the side joints 8 maintain the jointed state without peeling off the ventral region 5a and the dorsal region 5b during the wearing operation and wearing.
In this specification, unintentional separation of the ventral region 5a and the dorsal region 5b of the side joints 8 when the diaper 1 is put on and worn is expressed as "peeling off".
On the other hand, when changing the diaper 1 after wearing it, from the viewpoint of hygienically disposing of the excrement adhering to the diaper 1, a caregiver or the like should separate the ventral region 5a and the dorsal region 5b of the side joints 8 from each other. are separated and the diaper 1 is unfolded and then discarded.
In this specification, when the diaper 1 is discarded, the action of intentionally separating the ventral region 5a and the dorsal region 5b of the side joints 8 by applying an external force to the side joints 8 and/or the periphery thereof is referred to as " Tear apart.”
In this way, it is preferable that the side joints 8 have such a structure that they can be prevented from being peeled off during the wearing operation and wearing, and can be easily torn at the time of disposal.

From the above point of view, as shown in FIG. 3 , in the present embodiment, at least one of the side joints 8 includes a plurality of seal portions S and a fusion bond strength reducing agent 9 . As will be described later, the pair of side joints 8 preferably have the same configuration, but the configuration of one of the side joints 8 will be described in detail below.
Also, in this specification, unless otherwise specified, the dimensions and angles of each part are measured in a natural state in which the elastic member of each part is not stretched.

The seal portion S is a portion where the thermoplastic sheets 50 of both the ventral region 5a and the dorsal region 5b are fused and joined. The sealed portion S is bonded by, for example, pressurizing means and/or heating means, and specifically by heat sealing, ultrasonic sealing, or the like.
The plurality of seal portions S are spaced apart in the vertical direction X and extend in the horizontal direction Y, respectively.
By arranging a plurality of seal portions S apart from each other in the vertical direction X, it is possible to prevent the entire side joint portion 8 from being peeled off along the vertical direction X when one seal portion S is peeled off.
As shown in FIG. 3 , it is preferable that the plurality of seal portions S are arranged at equal intervals in the vertical direction X from the viewpoint of stabilizing the joint strength of the entire side joint portion 8 .

“The seal portion S extends in the horizontal direction Y” means that the seal portion S as a whole extends in the horizontal direction Y because the dimension in the horizontal direction Y of the seal portion S is larger than the dimension in the vertical direction X. means. In other words, the seal portion S is not limited to extending parallel to the horizontal direction Y.
The seal portion S includes an inner end portion Sc that is an inner end portion in the lateral direction Y and an outer end portion Sd that is an outer end portion in the lateral direction Y.
Further, the seal portion S includes, for example, an upper end portion Sa extending in the lateral direction Y, which is the end portion on the waist end portion 8a side, and a lower end portion Sb, which is the end portion on the leg end portion 8b side and extends in the lateral direction Y. may contain.
In the example shown in FIG. 3, the seal portion S is configured in a rectangular shape extending in the horizontal direction Y in plan view.

The fusion bond strength reducing agent 9 is arranged between the thermoplastic sheets 50 of the exterior body 5 and has a structure extending linearly. The fusion bond strength reducing agent 9 is placed between the thermoplastic sheets 50 of the exterior body 5 at a position that partially overlaps the seal portion S before the sealing process for forming the seal portion S, for example. The fusion bond strength reducing agent 9 has a function of inhibiting the fusion bond of the thermoplastic resin in this sealing step and reducing the bond strength of the seal portion S. A specific example of the fusion bonding strength reducing agent 9 will be described later.
The fusion bonding strength reducing agent 9 may be placed between the thermoplastic sheets 50 included in the ventral region 5a or may be placed between the thermoplastic sheets 50 included in the dorsal region 5b. Alternatively, the fusion bond strength reducing agent 9 is disposed between the thermoplastic sheet 50 closest to the skin in the ventral region 5a and the thermoplastic sheet 50 closest to the skin in the back region 5b, which face each other at the side joints 8. may
"The fusion strength reducing agent 9 extends linearly" means that the fusion strength reducing agent 9 extends linearly and/or curvedly.

As shown in FIG. 3, the plurality of seal portions S includes at least a first cross seal portion S1 and a second cross seal portion S2. The first cross-sealed portion S1 and the second crossed-sealed portion S2 are seal portions S that intersect the fusion bond strength reducing agent 9 in plan view among the plurality of seal portions S, and have the following configurations.
The first cross seal S1 and the second cross seal S2 are located in the waist region 8c located within 25 mm from the waist end 8a. According to the findings of the present inventors, at the start of the tearing operation for disposal, the fingers of the caregiver or the like are placed at positions of about 25 mm to 30 mm from the waist opening end Wa on both sides of the side joint 8 in the lateral direction Y. easy to be For this reason, the waist region 8c is a region to which an external force for tearing (also referred to as "tearing force") is particularly likely to be applied during disposal.
The first cross seal portion S1 and the second cross seal portion S2 are arranged adjacent to each other in this order from the waist end portion 8a side toward the leg end portion 8b side. That is, the first cross seal portion S1 is arranged on the waist side, and the second cross seal portion S2 is arranged on the leg side.
3, the first cross seal portion S1 is not limited to the seal portion S located closest to the waist in the waist region 8c, and the first cross seal portion S1 and the second cross seal portion S2 It suffices if it is arranged in the region 8c.

In addition, from the viewpoint of preventing peeling during the wearing operation and wearing, the first cross-sealed portion S1 and the second cross-sealed portion S2 have a reduced fusion strength in a plan view other than the inner end portion Sc and the outer end portion Sd. crosses agent 9;
That is, the fusion bond strength reducing agent 9 crosses the first cross seal portion S1 and the second cross seal portion S2 in a direction crossing the lateral direction Y, at least from the upper end portion Sa of the first cross seal portion S1 to the second cross seal portion S1. It extends to the lower end portion Sb of the seal portion S2.
In the first cross-sealed portion S1 and the second cross-sealed portion S2, if the portion overlapping the fusion strength reducing agent 9 in a plan view is defined as a crossing portion 9s, the crossing portion 9s is located at the inner end portion Sc and the outer end portion Sd. It is located between the inner end Sc and the outer end Sd.
It is preferable that there is one intersection portion 9s in each of the intersection seal portions S1 and S2. For example, in the side joint portion 8, it is more preferable that one fusion bond strength reducing agent 9 intersects the first cross seal portion S1 and the second cross seal portion S2 at one location.

Furthermore, from the viewpoint of improving tearability at the time of disposal, the side joint portion 8 including the first cross seal portion S1 and the second cross seal portion S2 satisfies the following formula (1).
5 degrees < α1 ≤ α2 < α3 ≤ α4 < 90 degrees (1)
In the above formula (1), the intersection angle between the fusion bond strength reducing agent 9 and the first cross seal portion S1 on the side of the waist end portion 8a and inside in the lateral direction Y is α1. In the example shown in FIG. 3, the crossing angle α1 is the crossing angle of the fusion bond strength reducing agent 9 and the upper end portion Sa of the first cross seal portion S1 in the lateral direction Y. In the example shown in FIG.
The crossing angle between the fusion bond strength reducing agent 9 and the first cross seal portion S1 on the side of the leg end 8b and outside in the horizontal direction Y is α2. In the example shown in FIG. 3, the crossing angle α2 is the outside crossing angle in the lateral direction Y between the fusion bond strength reducing agent 9 and the lower end portion Sb of the first cross seal portion S1.
Let α3 be the intersection angle between the fusion bond strength reducing agent 9 and the second intersection seal portion S2 on the side of the waist end portion 8a and on the inner side in the horizontal direction Y. In the example shown in FIG. 3, the crossing angle α3 is the crossing angle of the fusion bond strength reducing agent 9 and the upper end portion Sa of the second cross seal portion S2 in the lateral direction Y. In the example shown in FIG.
The crossing angle between the fusion bond strength reducing agent 9 and the second cross seal portion S2 on the side of the leg end 8b and outside in the horizontal direction Y is α4. In the example shown in FIG. 3, the crossing angle α4 is the outside crossing angle in the lateral direction Y between the fusion bond strength reducing agent 9 and the lower end portion Sb of the second cross seal portion S2.
The crossing angle between the fusion strength reducing agent 9 and each cross seal portion S1, S2 is the side edge of the fusion strength reducing agent 9 in the horizontal direction Y and the upper end portion Sa (inner side) of each cross seal portion S1, S2. Or it means the angle between the bottom end Sb (outside). When the fusion strength-reducing agent 9 has a curved shape, the intersection angle is the crossing point of the side edge of the fusion strength-reducing agent 9 in the lateral direction Y and the upper end portion Sa or the lower end portion Sb. The angle between the tangent to the side edge of 9 in the lateral direction Y and the upper end Sa or the lower end Sb.

[Action and effect of the above configuration]
In the above configuration, in the side joints 8, the fusion bond strength reducing agent 9 intersects the first cross seal portion S1 and the second cross seal portion S2 located in the waist region 8c. As a result, the bonding strength of the portions (crossing portions 9s) of the first cross-sealed portion S1 and the second cross-sealed portion S2 intersecting with the fusion bonding strength reducing agent 9 decreases. Therefore, the joint strength of the waist region 8c to which a tearing force is likely to be applied directly at the time of disposal can be reduced, and the tearing of the side joints 8 can be facilitated.
Further, the fusion bonding strength reducing agent 9 does not overlap the inner end portion Sc and the outer end portion Sd of the first cross seal portion S1 and the second cross seal portion S2. As a result, when the fingers of a caregiver pulling up the pants-type absorbent article come into contact with the outer ends Sd of the first cross seals S1 and/or the second cross seals S2 during the wearing operation, the outer ends Sd It is possible to prevent the seal portion S from being peeled off. In addition, when the wearer's waist circumference fluctuates greatly during wearing, and a force in the lateral direction Y is applied to the inner ends Sc of the first cross seal portion S1 and the second cross seal portion S2, the inner ends Sc It is possible to prevent the seal portion S from being peeled off.
Therefore, with the above configuration, it is possible to effectively prevent the peeling of the side joints 8 during the wearing operation and wearing.

In addition, since the side joint portion 8 satisfies the above formula (1), the fusion bond strength reducing agent 9 forming the weak joint portion extends in a preferable direction, and the ease of tearing at the time of disposal can be improved. .
When tearing the side joints 8 at the time of disposal, first, the fingers of both hands of a caregiver or the like are placed on both sides in the horizontal direction Y near the waist region 8c of the side joints 8 . In this state, tearing force in the horizontal direction Y is applied to the ventral region 5a and the dorsal region 5b of the waist region 8c. As a result, the seal portion S on the side of the waist end portion 8a is torn. Subsequently, a tearing force in the longitudinal direction X is applied to the side joints 8 from the waist end 8a side toward the leg end portion 8b side, and the seal portion S is applied from the waist end portion 8a side to the leg end portion 8b side. are torn apart in turn.
Since the side joint portion 8 satisfies the above formula (1), the angle between the second cross seal portion S2 and the fusion strength reducing agent is greater than the crossing angles α1 and α2 between the first cross seal portion S1 and the fusion strength reducing agent 9. The crossing angles α3 and α4 with 9 are larger. That is, in the first cross-sealed portion S1, the extension direction of the fusion strength-reducing agent 9 is inclined with respect to the longitudinal direction X, but in the second cross-sealed portion S2, the fusion strength-reducing agent 9 changes to a direction nearly parallel to the longitudinal direction X. As a result, tearing in the horizontal direction Y is likely to be induced in the first cross-sealed portion S1, and tearing in a direction close to the longitudinal direction X is easily induced in the second cross-sealed portion S2. Also, the upper end portion Sa of each cross seal portion S1, S2 can be a portion to which the tearing force is first applied in each cross seal portion S1, S2. Therefore, by changing the crossing angles α1 and α3 on the side of the upper end portion Sa, it becomes easier for a caregiver or the like to feel a change in the tearing direction. Therefore, the fusion bonding strength reducing agent 9 can induce tearing in the preferred direction from the lateral direction Y to the longitudinal direction X, and the caregiver or the like can tear the side joint 8 more easily.
Further, by satisfying 5 degrees<α1 and α4<90 degrees, the change in the angle of the fusion strength reducing agent 9 is suppressed within a range in which tear easiness can be ensured, and the fusion strength reducing agent 9 is placed in the first cross seal portion. It can be reliably crossed with S1 and the second cross seal portion S2.
As described above, according to the above configuration, it is possible to achieve both the prevention of peeling of the side joints 8 during the wearing operation and wearing, and the ease of tearing at the time of disposal.

Furthermore, from the viewpoint of inducing tearing in a more preferable direction, the side joint portion 8 including the first cross seal portion S1 and the second cross seal portion S2 preferably satisfies the following formula (1)′.
5 degrees<α1<α2<α3<α4<90 degrees (1)'
Since the side joint portion 8 satisfies the above formula (1)', the fusion strength reducing agent is applied from the waist end portion 8a side of the first cross seal portion S1 toward the leg end portion 8b side of the second cross seal portion S2. The crossing angles α1, α2, α3 and α4 of 9 gradually increase. As a result, tearing in the vertical direction X can be induced more smoothly from the upper end portion Sa side of the first cross seal portion S1 toward the lower end portion Sb of the second cross seal portion S2. Therefore, the fusion bonding strength reducing agent 9 can more effectively induce tearing in the preferred direction from the lateral direction Y to the longitudinal direction X, and the ease of tearing of the side joints 8 can be improved.

[Configuration example of exterior body]
As shown in FIG. 4 , the exterior body 5 preferably includes, for example, an outer layer sheet 51 and an inner layer sheet 52 as a plurality of thermoplastic sheets 50 . The outer layer sheet 51 is arranged on the non-skin side of the inner layer sheet 52 and forms the non-skin facing surface of the exterior body 5 . Between the inner layer sheet 52 and the outer layer sheet 51, an elastic member 10, which will be described later, is preferably arranged.
In the present embodiment, at least part of the exterior body 5 is folded back from the waist opening end Wa toward the skin side, so that the exterior body 5 has a folded structure. In the example shown in FIG. 4, only the outer layer sheet 51 is folded back from the waist end 8a to the skin side.
In addition, in the cross-sectional view of FIG. 4, for the sake of explanation, the ventral region 5a and the dorsal region 5b of the side joint portion 8 are shown in a separated state.

In the example shown in FIG. 4, the waist region 8c is arranged in the region including the folding structure of the outer body 5. In the example shown in FIG.
In this case, in the waist region 8c, in the plurality of thermoplastic sheets 50 of the exterior body 5, the skin-side sheet P constituting the skin-facing surface is the folded outer layer sheet 51, and the adjacent sheet Q adjacent to the skin-side sheet P becomes the inner layer sheet 52 .
The skin-side sheet P is the sheet positioned closest to the skin in the waist regions 8c of the abdominal region 5a and the back region 5b. The skin-side sheet P in the ventral region 5a and the skin-side sheet P in the dorsal region 5b face each other and are in contact with each other and sealed. That is, the skin-facing surface of the skin-side sheet P serves as the joint interface of the side joint portion 8 .

[Arrangement example of fusion bonding strength reducing agent]
From the viewpoint of reducing the bonding strength of the seal portion S more effectively, the fusion bonding strength reducing agent 9 is preferably arranged as follows.
As shown in FIG. 4, the fusion bond strength reducing agent 9 is preferably arranged between the skin-side sheet P and the adjacent sheet Q in the waist region 8c. In the example shown in FIG. 4, the fusion bond strength reducing agent 9 is placed in the ventral region 5a, but it may be placed in the dorsal region 5b, and may be placed in both the ventral region 5a and the dorsal region 5b. may be
As a result, the adhesive strength reducing agent 9 is arranged between the skin-side sheet P, which serves as a bonding interface during sealing, and the adjacent sheet Q adjacent thereto. Therefore, the fusion strength-reducing agent 9 is more likely to inhibit the fusion between the ventral region 5a and the dorsal region 5b, and the bonding strength at the intersection 9s can be effectively reduced. As a result, tearability can be further improved.

From the viewpoint of further improving tearability, it is preferable that the penetration depth of the fusion strength reducing agent 9 in the skin side sheet P is deeper than the penetration depth of the fusion strength reducing agent 9 in the adjacent sheet Q.
The penetration depth means the penetration depth of the fusion bond strength reducing agent 9 from the coated surface in the sheet thickness direction. The penetration depth can be measured as follows.

<Method for measuring penetration depth of agent for reducing fusion strength>
The side joint portion 8 to be measured is cut in the vertical direction X and the horizontal direction Y to prepare a measurement piece in which the cross section of the fusion bonding strength reducing agent 9 appears. Next, an enlarged cross-sectional image of the side joint portion 8 of the measurement piece is photographed at a magnification of 200 using a microscope VHX1000 manufactured by KEYENCE to obtain an image of the observation field. In the observation field of view, the portion into which the agent for reducing the fusion bonding strength 9 has permeated is observed as a portion that shines transparently. This measurement is performed at five locations in the waist region 8c, and the average value of these measurements is taken as the permeation depth of the fusion bond strength reducing agent 9 in the waist region 8c.

This makes it easier for the fusion strength reducing agent 9 to migrate from the non-skin-facing surface of the skin-side sheet P to the skin-facing surface side that serves as the bonding interface, and the fusion strength reducing agent 9 is more effective in inhibiting fusion. can be effectively demonstrated. Therefore, tearability can be improved more effectively.

[Configuration example of cross seal part]
The first cross seal portion S1 and the second cross seal portion S2 are not limited to the configuration shown in FIG. 3 as long as they are seal portions S arranged in the waist region 8c.
As in the example shown in FIG. 5, the first cross seal portion S1 is preferably the seal portion S that is located closest to the waist end portion 8a among the plurality of seal portions S. As shown in FIG. As a result, the seal portion S closest to the waist end portion 8a intersects the fusion bond strength reducing agent 9 as the first cross seal portion S1. Therefore, the side joint portion 8 can be easily torn from the vicinity of the waist end portion 8a, and the easiness of tearing can be improved.

Moreover, from the viewpoint of improving tearability in the longitudinal direction X, the plurality of seal portions S may include three or more cross seal portions.
For example, the plurality of seal portions S intersects the fusion bond strength reducing agent 9, and includes 3 or more n cross seal portions S1 including a first cross seal portion S1 and a second cross seal portion S2. , S2, . . . , Sn.
In the example shown in FIG. 5, the plurality of seals S includes a first cross seal S1, a second cross seal S2 and a third cross seal S3.
In addition, in the following description, each cross seal portion S2, . . . , Sn is also referred to as cross seal portion Sk.
Also, n is an integer of 3 or more, and k is an integer of 2 or more and n or less.

In this case, it is preferable that the side joint portion 8 including three or more cross seal portions S1, S2, .
α(2(k−1)−1)≦α(2(k−1))<α(2k−1)≦α(2k) (2)
5 degrees < α1 ≤ α2 < ... < α (2n-1) ≤ α (2n) ≤ 90 degrees (3)
In the example shown in FIG. 5, when n=3, the following equation (3)'' holds from equations (2) and (3).
5 degrees<α1≦α2<α3≦α4<α5≦α6≦90 degrees (3)''

In the above formulas (2) and (3), on the waist end 8a side of the k-th cross seal portion Sk from the first cross seal portion S1 to the leg end portion 8b side and the fusion bonding strength reducing agent 9 Let α(2k−1) be the crossing angle in the horizontal direction Y. In other words, the crossing angle α(2k−1) is the crossing angle in the horizontal direction Y between the fusion bond strength reducing agent 9 and the upper end portion Sa of the k-th cross seal portion Sk.
Let α(2k) be the intersection angle between the k-th cross seal portion Sk and the fusion bond strength reducing agent 9 on the side of the leg end 8b and outside in the horizontal direction Y. That is, the crossing angle α(2k) is the crossing angle of the outer side in the lateral direction Y between the fusion bond strength reducing agent 9 and the lower end portion Sb of the k-th cross seal portion Sk.
That is, the formula (2) is the crossing angle α(2(k−1)−1) and the crossing angle α(2(k−1)) of the (k−1)th cross seal portion S(k−1) The intersection angle α(2k−1) and the intersection angle α(2k) of the next k-th intersection seal portion Sk are larger than that.
In the formula (3), the intersection angle α1 of the first cross seal portion S1 closest to the waist end 8a is greater than 5 degrees, and the cross angle α(2n) of the cross seal portion Sn closest to the leg end 8b is 90 degrees. degree or less.

Since the side joint portion 8 satisfies Expression (2), the crossing angle of the fusion bond strength reducing agent 9 gradually increases from the first cross seal portion S1 toward the cross seal portion Sn on the side of the leg end portion 8b. That is, in the first cross seal portion S1, the extending direction of the fusion strength reducing agent 9 is a direction inclined with respect to the longitudinal direction X, but the fusion strength decreases toward the cross seal portion Sk on the leg side. The extending direction of the agent 9 changes to a direction nearly parallel to the longitudinal direction X. As a result, tearing in the horizontal direction Y is likely to be induced in the first cross seal portion S1, and tearing in a direction close to the longitudinal direction X is more likely to be induced toward the cross seal portion Sk on the leg side. Therefore, the fusion bond strength reducing agent 9 can induce tearing in a preferred direction, and can induce longer tearing in the longitudinal direction X, thereby further improving tearability of the side joints 8 .
Further, by satisfying 5 degrees<α1 and α(2n)≦90 degrees, the change in the angle of the adhesive strength reducing agent 9 can be suppressed within a range in which the easiness of tearing can be ensured. Furthermore, by satisfying α(2n)≦90 degrees, a stable tearing operation can be realized without the tearing direction returning from the outer side to the inner side in the lateral direction Y.

Furthermore, from the viewpoint of inducing tearing in a more preferable direction, the side joint portion 8 including three or more cross seal portions S1, S2, . is more preferred.
α(2(k−1)−1)<α(2(k−1))<α(2k−1)<α(2k) (2)′
5 degrees<α1<α2<...<α(2n-1)<α(2n)≦90 degrees...(3)'
Since the side joint portion 8 satisfies the formulas (2)' and (3)', from the waist end portion 8a side of the first cross seal portion S1 toward the leg end portion 8b side of the n-th cross seal portion Sn, The crossing angle of the fusion bond strength reducing agent 9 gradually increases. That is, the extending direction of the fusion bond strength reducing agent 9 is inclined with respect to the longitudinal direction X on the upper end Sa side of the first cross seal portion S1, but the cross seal portion Sn on the side of the leg end 8b. The extension direction of the fusion bond strength reducing agent 9 gradually changes to a direction nearly parallel to the longitudinal direction X toward the lower end portion Sb of . As a result, tearing in a direction close to the longitudinal direction X can be induced more smoothly and stably.

In addition, from the viewpoint of further improving tearability, all the seal portions S located in the intersection region 8d within 10 mm from the upper end portion Sa of the first intersection seal portion S1 to the leg end portion 8b side are reduced in fusion strength. It is preferably configured as an intersection seal portion Sk that intersects with the agent 9 .
In FIG. 5, for the sake of explanation, the dimension of the intersection region 8d is shown larger than the actual dimension with respect to the dimension of the waist region 8c.
The crossing region 8d within 10 mm from the first crossing seal portion S1 to the leg end portion 8b side is located near the region where the fingers of a caregiver or the like who discards is likely to be placed, and the force in the lateral direction Y is applied at the start of the tearing operation. It is also an area where is particularly likely to be added. By constructing all of the seal portions S of the intersection region 8d as the intersection seal portions Sk, the bonding strength of the intersection region 8d can be reliably reduced, and tearing can be performed with a weak force at the start of the tearing operation. Therefore, it is possible to prevent the tearing force from becoming too strong, thereby preventing the problem of tearing of the exterior body 5 itself.

Further, in this case, in the cross seal portion Sk in the cross region 8d, as it goes toward the leg end 8b side, from the inner end in the lateral direction Y (inner end Sc) to the cross portion 9s with the fusion strength reducing agent 9. is preferably gradually increased. In addition, in this case, it is preferable that the crossing portions 9s of all the crossing seal portions Sk in the crossing region 8d do not overlap the outer ends (outer ends Sd) in the horizontal direction Y in plan view.
The distance ak from the inner end Sc to the crossing portion 9s means the distance in the lateral direction Y from the inner end Sc to the innermost portion of the crossing portion 9s in the lateral direction Y.
That is, in the above configuration, when k is an integer of 2 or more, the distance a (k-1) and k The following equation (4) holds for the distance ak of the th cross seal portion Sk.
a(k−1)<ak (4)
Further, let Ak be the length in the horizontal direction Y of the cross seal portion Sk. The length Ak is the dimension in the lateral direction Y from the inner end Sc to the outer end Sd of the cross seal portion Sk. In this case, the following formula (5) holds for all cross seal portions Sk in the cross region 8d.
ak<Ak (5)

In the above configuration, in the crossing region 8d, the crossing portion 9s, which is a weak joint portion, is arranged gradually outward in the horizontal direction Y from the waist end portion 8a side to the leg end portion 8b side. As a result, the tearing force applied to the intersection region 8d in the lateral direction Y can efficiently tear off all the cross seal portions Sk within the intersection region 8d. Therefore, the intersecting region 8d, to which a force is likely to be applied particularly at the beginning of tearing, can be smoothly torn with a weak force, and the easiness of tearing can be improved.

[Dimension example of seal part]
The dimensions of the seal portion S including the first cross seal portion S1 and the second cross seal portion S2 include the following examples from the viewpoint of achieving both peel prevention and tear easiness during wearing and wearing. In addition, as described above, the following dimensions are the dimensions in the natural state in which the elastic member is not stretched.
The length of the seal portion S in the lateral direction Y is preferably 0.5 mm or more, more preferably 1 mm or more, and is preferably 10 mm or less, more preferably 4 mm or less, and more preferably 0.5 mm or more and 10 mm or less. , more preferably 1 mm or more and 4 mm or less.
The length of the seal portion S in the longitudinal direction X is preferably 0.1 m or more, more preferably 0.3 mm or more, and is preferably 2 mm or less, more preferably 0.6 mm or less, and more preferably 0.6 mm or less. It is 1 mm or more and 2 mm or less, more preferably 0.3 mm or more and 0.6 mm or less.
The length of the seal portion S in the lateral direction Y is preferably 100% or more, more preferably 400% or more, and more preferably 1000% or less, more preferably 100% or more of the length of the seal portion S in the longitudinal direction X. is 800% or less, preferably 100% or more and 1000% or less, more preferably 400% or more and 800% or less.
The distance in the longitudinal direction X between adjacent seal portions S is preferably 0.1 mm or more, more preferably 1 mm or more, and is preferably 10 mm or less, more preferably 4 mm or less, and more preferably 0.1 mm or more. It is 10 mm or less, more preferably 1 mm or more and 4 mm or less.

[Configuration example of elastic member]
As shown in FIG. 2, the ventral region 5a and the dorsal region 5b of the armor 5 include a plurality of elastic members 10 extending in the horizontal direction Y. As shown in FIG.
A plurality of elastic members 10 are arranged between a plurality of thermoplastic sheets 50 of the outer body 5 . In the example shown in FIG. 4 , the plurality of elastic members 10 are arranged between the outer layer sheet 51 and the inner layer sheet 52 .
These elastic members 10 exhibit stretchability around the waist of the diaper 1, facilitate the wearing operation, and maintain the fit when worn.
In addition, "the elastic member 10 extends in the lateral direction Y" means that the elastic member 10 extends in the lateral direction Y in the deployed and extended state. However, the above expression is not limited to a mode in which the elastic member 10 is parallel to the lateral direction Y in the deployed and stretched state, and includes a mode in which the elastic member 10 extends in the lateral direction Y as a whole.
Furthermore, as shown in FIG. 2, the outer body 5 may include leg elastic members 11 arranged around the leg openings 1L in addition to the elastic members 10 described above.

The elastic members 10 and 11 preferably have a rectangular, square, circular, polygonal cross section, and are thread-like (string rubber, etc.) or string-like (flat rubber, etc.), or multi-filament type thread-like ones. can. The materials of the elastic members 10 and 11 can be those conventionally used in absorbent articles such as disposable diapers without particular limitation. EVA, elastic polyolefin, polyurethane and the like can be mentioned.

From the viewpoint of ensuring the stretchability of the entire waist circumference, the lateral Y outer end of the elastic member 10 of each of the ventral region 5a and the dorsal region 5b is preferably positioned at or near the side joints 8. preferable. Specifically, it is preferable that the distance between the end portion and the side joint portion 8 in the lateral direction Y is 10 mm or less, and the distance is 0 mm and the end portion is positioned within the side joint portion 8. is more preferable.
The elastic member 10 is generally arranged up to or near the area where force is applied during tearing, which tends to affect the ease of tearing during disposal.
Therefore, from the viewpoint of improving the ease of tearing at the time of disposal, it is preferable to adjust the elongation rate of the elastic member as follows.

As shown in FIG. 2, the ventral area 5a and the back area 5b are each divided into a waist elastic area 5f and a leg elastic area 5g. These areas are defined by imaginary boundary lines extending parallel to the lateral direction Y at positions 25 mm in the longitudinal direction X from the waist opening end Wa. That is, the waist elastic region 5f is positioned within 25 mm in the vertical direction X from the waist opening end Wa. Both side edges in the horizontal direction Y of the waist elastic region 5f correspond to the waist region 8c described above. The leg-side stretchable region 5g is located closer to the leg in the vertical direction X than the waist stretchable region 5f. The boundary line separating the waist stretchable region 5f and the leg side stretchable region 5g extends parallel to the lateral direction Y at a position 25 mm in the longitudinal direction X from the waist opening edge Wa in the unfolded and stretched state.

The waist elastic region 5f includes a plurality of elastic members 10 extending in the horizontal direction Y. As shown in FIG. Similarly, the leg-side stretchable region 5g includes a plurality of elastic members 10 extending in the lateral direction Y. As shown in FIG. The average stretch rate of the plurality of elastic members 10 in the waist stretchable region 5f is preferably lower than the average stretch rate of the plurality of elastic members 10 in the leg-side stretchable region 5g.
The stretch rate of the elastic member 10 means the ratio of the length of the elastic member stretched in the unfolded and stretched state of the pants-type absorbent article to the length of the elastic member in the natural length taken out from the pants-type absorbent article. .
That is, the lower the elongation rate, the smaller the elastic force when the elastic member 10 is pulled.
The extension rate of the elastic member 10 can be adjusted by adjusting the degree of extension of the elastic member 10 arranged on the exterior body 5 at the time of manufacturing. During manufacturing, for example, the elastic member 10 is stretched to a predetermined length, an adhesive is applied to the elastic member 10 with a comb or the like, and the elastic member 10 is fixed to the thermoplastic sheet 50 of the exterior body 5 .

As described above, the waist region 8c is likely to be directly subjected to force in the lateral direction Y during the tearing operation. In the above configuration, since the elastic member 10 in the waist stretchable region 5f has a low average elongation rate, the elastic force of the elastic member 10, which acts as a resistance against the tearing force, is low. As a result, the energy associated with the tearing force is less likely to be consumed by the elongation of the elastic member 10, and even a weaker force can efficiently tear. Therefore, with the above configuration, a stable tearing operation becomes possible, and troubles such as tearing of the exterior body 5 due to excessive tearing force can be prevented.

<Method for measuring average elongation of elastic member>
The side joints 8 of the pants-type absorbent article are separated, the absorbent main body 4 is removed, and the ventral region 5a and the dorsal region 5b of the exterior body 5 are cut out. Further, cut parallel to the horizontal direction Y at a position 25 mm in the vertical direction X from the waist opening edge Wa of the abdominal region 5a and the back region 5b to cut out the waist stretchable region 5f and the leg side stretchable region 5g.
Then, the length of the elastic member 10 in each cut-out region is measured in the unfolded and stretched state of the pants-type absorbent article. From this measured value, the average value of the lengths of all the elastic members 10 in the maximum stretched state in each of the regions 5f and 5g is calculated.
All the elastic members 10 fixed to the regions 5f and 5g by adhesive or the like are removed from the other constituent members of the exterior body 5 using a suitable solvent such as ethyl acetate, and the natural lengths of the regions 5f and 5g are removed. The length of elastic member 10 is measured. From this measured value, the average value of the lengths of all the natural lengths of the elastic members 10 in each of the regions 5f and 5g is calculated.
Then, in each of the regions 5f and 5g, the ratio of the average length of the elastic member 10 in the unfolded and stretched state to the average length of the elastic member 10 in the natural length is calculated. Let it be the average elongation rate of the elastic member 10 .

The average stretch rate of the plurality of elastic members 10 in the waist elastic region 5f is preferably 120% or more, more preferably 130% or more, and preferably 500% or less, more preferably 450% or less.
The average stretch rate of the plurality of elastic members 10 in the leg-side stretchable region 5g is preferably 150% or more, more preferably 180% or more, and preferably 550% or less, more preferably 500% or less.
The ratio of the average stretch rate of the plurality of elastic members 10 in the waist stretchable region 5f to the average stretch rate of the plurality of elastic members 10 in the leg-side stretchable region 5g is preferably 20% from the viewpoint of effectively obtaining the above effects. Above, more preferably 30% or more, preferably 90% or less, more preferably 80% or less.

[Construction example of fusion bonding strength reducing agent in plan view]
From the viewpoint of realizing a more stable tearing operation, the fusion bonding strength reducing agent 9 preferably has the following configuration in plan view.
As shown in FIG. 3, the width b1 in the horizontal direction Y of the crossing portion 9s between the first cross seal portion S1 and the fusion strength reducing agent 9 is equal to the width b1 of the crossing portion 9s between the second cross seal portion S2 and the fusion strength reducing agent 9. It is preferably substantially the same as the width b2 in the horizontal direction Y of the portion 9s.
Widths b1 and b2 of each crossing portion 9s in the lateral direction Y are average values of the width of the crossing portion 9s in the lateral direction Y at the upper end portion Sa and the width of the crossing portion 9s in the lateral direction Y at the lower end portion Sb. be able to.
The width is "substantially the same" means that the width of each crossing portion 9s is within 150% of the smallest width of all the crossing portions 9s defined as 100%. do.
In the above configuration, fluctuations in the widths b1 and b2 of the crossing portion 9s, which is a weak joint, can be suppressed, and fluctuations in the bonding strength of the cross seal portions S1 and S2 can be suppressed. As a result, a caregiver or the like who disposes of the pants-type absorbent article can be prevented from feeling discomfort during tearing. Therefore, it is possible to prevent a problem such as a caregiver or the like applying an excessively strong tearing force to tear the exterior body 5 .
In addition, by stabilizing the widths b1 and b2 of the crossing portion 9s, it is possible to suppress a significant decrease in the bonding strength of the crossing seal portions S1 and S2, and the peeling of the side joint portion 8 during the wearing operation and wearing is more reliably prevented. can be prevented.

Further, as in the example shown in FIG. 5, when the plurality of seal portions S includes three or more n cross seal portions S1, S2, . , . . . , and the widths in the transverse direction Y of the intersecting portions 9s of Sn with the fusion bonding strength reducing agent 9 are preferably substantially the same.
Thereby, in addition to the ease of tearing in the longitudinal direction X, the stability of the tearing operation can be enhanced.

Specifically, the width of the intersection portion 9s in the horizontal direction Y is preferably 5% or more, more preferably 10% or more, and preferably 60% or less of the length of the intersection seal portion Sk in the horizontal direction Y. , more preferably 50% or less.
The width of the intersection 9s in the lateral direction Y is preferably 0.1 mm or more, more preferably 0.2 mm or more, and preferably 1.5 mm or less, more preferably 1.2 mm or less.
The dimension of the intersection portion 9s and the dimension of the intersection seal portion Sk are measured as dimensions in the maximum stretched state.

Moreover, as shown in FIGS. 6A and 6B, the fusion bond strength reducing agent 9 is preferably configured in a curved shape. In this case, for example, the fusion strength reducing agent 9 is preferably composed of at least part of a spiral or wavy curve.
For example, the fusion bond strength reducing agent 9 may extend inward in the lateral direction Y of the side joint 8 as a whole, and preferably has a spiral or wavy curved shape as a whole in plan view. Moreover, it is preferable that at least a part of the spiral or wavy curve of the fusion bond strength reducing agent 9 is arranged in the side joint portion 8 so as to satisfy the above formula (1) and the like.

The spiral or wavy curve forming the fusion strength reducing agent 9 has a shape in which a plurality of unit shapes 9a and 9b are repeatedly arranged in one direction.
FIG. 6(A) shows an example in which the curve of the fusion bond strength reducing agent 9 is spiral. The term "spiral shape" as used herein means a shape in which a plurality of unit shapes 9a are repeatedly arranged along one direction, with a shape close to a circle or an ellipse being one unit shape 9a. In FIG. 6(A), unit shapes 9a close to an ellipse are repeatedly arranged in the lateral direction Y. In FIG. In FIG. 6A, each unit shape 9a is formed in a closed annular shape, but one unit shape 9a is partially connected to the adjacent unit shape 9a, and a plurality of unit shapes 9a are connected to each other. It may be formed continuously.
FIG. 6(B) shows an example in which the curve of the fusion bond strength reducing agent 9 is wavy. The wavy shape means a shape in which a plurality of unit shapes 9b are repeatedly arranged along the other direction, with a shape that undulates in one direction and the opposite direction as one unit shape 9b.

By forming the fusion bonding strength reducing agent 9 in the curved shape as described above, tearing can be smoothly induced, and local concentration of the tearing force can be suppressed. As a result, the caregiver or the like who disposes of the pants-type absorbent article can be prevented from feeling a sense of incompatibility during tearing, and the caregiver or the like can apply an excessively strong tearing force to prevent the exterior body 5 from tearing. Problems can be prevented.

Further, the spiral or wavy curve of the fusion strength reducing agent 9 preferably extends along the lateral direction Y. That is, it is preferable that the plurality of unit shapes 9a and 9b be arranged along the horizontal direction Y on the curve. As a result, it is possible to realize the fusion bond strength reducing agent 9 having a shape that satisfies the above formula (1) and a smooth curved shape.

In this case, it is preferable that the dimension in the vertical direction X is larger than the dimension in the horizontal direction Y in the unit shapes 9a and 9b. The dimensions of the unit shapes 9a and 9b are the dimensions of the unit shapes 9a and 9b at least partially overlapping the side joint portion 8 or the unit shapes 9a and 9b adjacent thereto. The dimension in the vertical direction X means the maximum dimension in the vertical direction X of the unit shapes 9a and 9b, and the dimension in the horizontal direction Y means the maximum dimension in the horizontal direction Y of the unit shapes 9a and 9b.
For example, in the spiral curve shown in FIG. 6A, the dimension c1 in the vertical direction X of the unit shape 9a is larger than the dimension c2 in the horizontal direction Y. As shown in FIG.
Similarly, for example, in the wavy curve illustrated in FIG. 6B, the dimension d1 in the vertical direction X of the unit shape 9b is larger than the dimension d2 in the horizontal direction Y.
As a result, the unit shapes 9a and 9b are elongated in the longitudinal direction X, so that tearing in the longitudinal direction X can be more easily guided, and the easiness of tearing can be further improved.

[Specific examples of adhesion strength reducing agent]
As the fusion bonding strength reducing agent 9, any substance capable of suppressing the influence of heat applied during the sealing process, which is the process of forming the seal portion S, can be used without particular limitation. Examples of such substances include hot-melt adhesives, polyurethane base materials, petroleum-based resins, and the like.
In addition to reducing the heat generated in the sealing process, from the viewpoint of joining the sheets together, it is preferable that the fusion bond strength reducing agent 9 is a hot-melt adhesive. As the hot-melt adhesive, for example, styrene-based (SIS, SBS, SEBS) or polyolefin-based materials can be used.
As for the method of disposing the adhesive strength reducing agent 9, a commonly used method can be used without particular limitation, but a method of applying the adhesive strength reducing agent 9 using a coater gun is preferable. As a result, it is possible to easily control the coating shape, basis weight, etc. of the fusion bonding strength reducing agent 9, and to easily control the bonding strength.

[Configuration example of a pair of side joints]
The tearing of the side joints 8 by a caregiver or the like is usually performed on both the left and right side joints 8 . For this reason, it is preferable that each of the pair of side joints 8 includes the first cross seal portion S1 and the second cross seal portion S2 and is configured to satisfy the formula (1).
In other words, when one of the pair of side joints 8 is the first side joint and the other is the second side joint, the second side joint preferably has the same configuration as the first side joint. .
Here, it is assumed that the pair of side joints 8 are configured substantially line-symmetrically with respect to the vertical center line CL, for example, and each have a configuration as shown in FIG.

Specifically, the pair of side joints 8 are arranged between a plurality of sealing portions S spaced apart in the longitudinal direction X and extending in the lateral direction Y, respectively, and the thermoplastic sheet 50, extending linearly. It is preferable to have a fusion bond strength reducing agent 9 .
In this case, the plurality of seal portions S of each of the pair of side joint portions 8 are the seal portions S arranged in the waist region 8c located within 25 mm from the waist end portion 8a. and a first cross-sealed portion S1 and a second cross-sealed portion S2 that intersect with the fusion bond strength reducing agent 9 other than the outer end portion Sd.
In this case, the first cross seal portion S1 and the second cross seal portion S2 of each of the pair of side joint portions 8 are arranged adjacent to each other in order from the waist end portion 8a side toward the leg end portion 8b side.
In this case, each of the pair of side joints 8 preferably satisfies the above formula (1). Formula (1) is shown again below.
5 degrees < α1 ≤ α2 < α3 ≤ α4 < 90 degrees (1)
In the above formula (1), the intersection angle between the fusion bond strength reducing agent 9 and the first cross seal portion S1 on the side of the waist end portion 8a and inside in the lateral direction Y is α1. The crossing angle between the fusion bond strength reducing agent 9 and the first cross seal portion S1 on the side of the leg end 8b and outside in the horizontal direction Y is α2. Let α3 be the intersection angle between the fusion bond strength reducing agent 9 and the second intersection seal portion S2 on the side of the waist end portion 8a and on the inner side in the horizontal direction Y. Let α4 be the intersection angle between the fusion bonding strength reducing agent 9 and the second intersection seal portion S2 on the side of the leg end portion 8b and on the outer side in the horizontal direction Y. As shown in FIG.
As a result, the tearability of both the left and right side joints 8 can be improved.

[Configuration example of skin-side sheet of exterior body]
Referring to FIG. 7, in the waist region 8c, the skin-side sheet P forming the skin-facing surface of the outer package 5 is preferably made of a spunbond nonwoven fabric from the viewpoint of improving tearability. From the viewpoint of sheet formability, the spunbond nonwoven fabric preferably contains, among the thermoplastic resins described above, polyolefins such as polyethylene and polypropylene, more preferably polypropylene. Examples of polypropylene include α-olefins.

The spunbond nonwoven fabric used for the skin-side sheet P preferably includes a plurality of embossed portions 12 from the viewpoint of reliably fusing fibers to form a sheet. The embossed portion 12 is a portion where fibers are crimped and fused. The embossed portion 12 is formed, for example, by intermittently by thermocompression bonding using an embossing convex roll and a flat roll, by ultrasonic fusion, or by intermittently applying hot air to partially fuse. and so on. From the viewpoint of high productivity and low equipment cost, the embossed portion 12 is preferably formed by thermocompression bonding.
The planar shape of the embossed portion 12 can take any shape such as circular, elliptical, polygonal, or similar shapes.
The embossed portions 12 are preferably formed in a uniform pattern, but may be formed in a random pattern. In FIG. 7, the embossed portions 12 are arranged at substantially constant intervals (pitch) in the vertical direction X and the horizontal direction Y, and each row along the horizontal direction Y is shifted from the adjacent row by half a pitch. are placed.
Since the fibers of the embossed portion 12 are likely to break due to heat treatment and/or processing during formation, the bonding strength of the area of the seal portion S that overlaps with the embossed portion 12 may be lower than that of the area that does not overlap. Therefore, from the viewpoint of further improving the ease of tearing, it is preferable to arrange the overlapping portions 12s of the first cross-sealed portion S1 and the second cross-sealed portion S2 and the embossed portion 12 as follows.

It is preferable that each of the first cross-sealed portion S1 and the second cross-sealed portion S2 overlaps with at least one embossed portion 12 other than the inner end portion Sc and the outer end portion Sd in plan view.
That is, in the first cross-sealed portion S1 and the second cross-sealed portion S2, if the portion overlapping the embossed portion 12 in plan view is the overlapping portion 12s, the overlapping portion 12s is positioned at the inner end portion Sc and the outer end portion Sd. Instead, it is preferably located between the inner end Sc and the outer end Sd.
Further, the overlapping portion 12s between the first cross-sealed portion S1 and the embossed portion 12 is preferably located outside the overlapping portion 12s between the second cross-sealed portion S2 and the embossed portion 12 in the horizontal direction Y.
The position of the overlapping portion 12s of each sealing portion S is compared by the distance in the horizontal direction Y from the inner end portion Sc of each sealing portion S to the overlapping portion 12s. The distance in the horizontal direction Y from the inner end Sc of each seal portion S to the overlapping portion 12s means the distance in the horizontal direction Y from the inner end Sc to the innermost portion in the horizontal direction Y of the overlapping portion 12s. That is, the distance e2 in the horizontal direction Y from the inner end Sc of the second cross seal portion S2 to the overlapping portion 12s is equal to the distance e1 in the lateral direction Y from the inner end Sc of the first cross seal portion S1 to the overlapping portion 12s. is preferably greater than

Since the overlapped portion 12s does not overlap the inner end portion Sc and the outer end portion Sd, when the caregiver or the like pulls up the pants-type absorbent article in the wearing operation, the fingers of the caregiver or the like may touch the inner end portion Sc and the outer end portion Sd. contact with the portion Sd to prevent the first cross-sealed portion S1 and the second cross-sealed portion S2 from peeling off. In addition, when the wearer's waist circumference fluctuates greatly during wearing, a force in the lateral direction Y is applied to the inner ends Sc of the first cross-sealed portion S1 and the second crossed-sealed portion S2 to prevent them from peeling off. can. Therefore, with this configuration, it is possible to prevent the side joints 8 from peeling off during the wearing operation and during wearing.
In addition, since the overlapped portion 12s of the second cross seal portion S2 is located outside the overlapped portion 12s of the first cross seal portion S1 in the lateral direction Y, the overlap portion 12s, which is a weak joint portion, can be the second cross seal portion. It is positioned further outside in the horizontal direction Y in S2. As a result, the first cross seal portion S1 and the second cross seal portion S2 can be efficiently torn by the tearing force applied in the lateral direction Y, and the easiness of tearing can be further improved.

[Configuration example when the number of layers of the exterior body at the side joint is different]
In this embodiment, as shown in FIG. 4, the exterior body 5 forming the side joint portion 8 has a folded structure, and the side joint portion 8 has a plurality of regions with different lamination numbers of the thermoplastic sheets 50. have.
That is, in the present embodiment, the side joint portion 8 includes a first lamination region T1 in which three or more thermoplastic sheets 50 are laminated, and a second lamination region T1 in which a smaller number of thermoplastic sheets 50 than the first lamination region T1 are laminated. 2 lamination region T2. The first lamination region T1 includes, as the thermoplastic sheet 50, a first skin-side sheet P1 that constitutes the skin-facing surface. The second lamination region T2 includes, as the thermoplastic sheet 50, a second skin-side sheet P2 that constitutes the skin-facing surface. In the present embodiment, the first lamination region T1 corresponds to a region where the exterior body 5 is folded back, and the skin-side sheet P in the waist region 8c corresponds to the first skin-side sheet P1.

In the example shown in FIG. 4, the first lamination region T1 of the ventral region 5a is composed of three layers: an outer layer sheet 51 that is not folded back, an inner layer sheet 52 that is not folded back, and an outer layer sheet 51 that is folded back. be done. The first lamination region T1 of the dorsal region 5b is also composed of the same three layers. Thus, the first lamination region T1 is composed of a total of six layers. In the first lamination region T1, the first skin side sheet P1 is composed of the outer layer sheet 51 folded back.
In the example shown in FIG. 4, the second laminated region T2 of the ventral region 5a is composed of two layers, an outer layer sheet 51 that is not folded back and an inner layer sheet 52 that is not folded back. The second laminated region T2 of the dorsal region 5b is also composed of two similar layers. Thus, the second lamination region T2 is composed of a total of four layers. In the second lamination region T2, the second skin side sheet P2 is composed of the inner layer sheet 52 that is not folded back.

In the above configuration, the number of laminated thermoplastic sheets 50 is greater in the first lamination region T1 than in the second lamination region T2, so the amount of thermoplastic resin is also greater. Therefore, the first lamination region T1 has a larger amount of resin to be heat-sealed than the second lamination region T2, and the bonding strength of the seal portion S tends to be high.
Therefore, in the present embodiment, by adopting the first skin-side sheet P1 and the second skin-side sheet P2 having different configurations, the bonding strength in the first lamination region T1 and the second lamination region T2 is adjusted, and tear stability is improved. can be improved.

(Arrangement of embossed portion on skin side sheet)
In the present embodiment, the first skin-side sheet P1 and the second skin-side sheet P2 are preferably made of a spunbond nonwoven fabric having a plurality of embossed portions 12, respectively.
In this case, in the first skin-side sheet P1 and the second skin-side sheet P2, the area ratio of the embossed portions 12, that is, the total area of the regions occupied by the plurality of embossed portions 12 in the predetermined region with respect to the total area of the region It is preferable to use spunbonded nonwoven fabrics having different ratios of . Specifically, it is preferable that the area ratio of the embossed portions 12 is higher in the first skin-side sheet P1 than in the second skin-side sheet P2.
The area ratio of the embossed portions 12 in the spunbonded nonwoven fabric is measured in a region containing a sufficiently large number of embossed portions 12, and can be measured in, for example, a 20 mm×20 mm square region of the spunbonded nonwoven fabric. The area occupied by each embossed portion 12 can be recognized as a series of areas where the fibers are thermally fused. In addition, the measurement of the above-mentioned area ratio shall be performed in the unfolded and stretched state.

As described above, in the embossed portion 12, the bonding strength of the seal portion S may decrease. Therefore, by increasing the area ratio of the embossed portions 12 in the first lamination region T1 having a large number of lamination layers, it is possible to suppress an increase in the bonding strength of the seal portion S in the first lamination region T1. As a result, the difference in bonding strength between the first lamination region T1 and the second lamination region T2 can be reduced, and the bonding strength of the entire side joint portion 8 can be further stabilized. Therefore, the tearing stability of the side joint portion 8 can be enhanced.

The area ratio of the embossed portions 12 of the first skin side sheet P1 is preferably 5% or more, more preferably 7% or more, and preferably 20% or less, more preferably 17% or less.
The area ratio of the embossed portions 12 of the second skin side sheet P2 is preferably 3% or more, more preferably 5% or more, and preferably 17% or less, more preferably 15% or less.

(melting point of skin side sheet)
As another example, the melting point of the first skin side sheet P1 is preferably higher than the melting point of the second skin side sheet P2.
The thermoplastic sheet 50 with a high melting point is less likely to be heat-sealed than the thermoplastic sheet 50 with a low melting point when the sealing process is performed under the same conditions, and the bonding strength is likely to decrease. Therefore, by increasing the melting point of the first skin-side sheet P1 in the first lamination region T1 where the number of layers is large, it is possible to suppress an increase in the bonding strength of the seal portion S in the first lamination region T1. As a result, the difference in bonding strength between the first lamination region T1 and the second lamination region T2 can be reduced, and the bonding strength of the entire side joint portion 8 can be further stabilized. Therefore, the ease of tearing the side joint portion 8 can be enhanced.

The melting point of the first skin side sheet P1 is preferably 125° C. or higher, more preferably 155° C. or higher, and preferably 260° C. or lower, more preferably 250° C. or lower.
The melting point of the second skin side sheet P2 is preferably 123° C. or higher, more preferably 125° C. or higher, and preferably 180° C. or lower, more preferably 170° C. or lower.

(Basis weight of skin side sheet)
As another example, the basis weight of the first skin-side sheet P1 is preferably lower than the basis weight of the second skin-side sheet P2.
In the thermoplastic sheet 50 with a high basis weight, the amount of thermoplastic resin is also large, and the bonding strength at the seal portion S tends to be high. Therefore, in the first lamination region T1 where the number of lamination is large, by reducing the basis weight of the first skin side sheet P1, it is possible to suppress an increase in the bonding strength of the seal portion S in the first lamination region T1. . As a result, the difference in bonding strength between the first lamination region T1 and the second lamination region T2 can be reduced, and the bonding strength of the entire side joint portion 8 can be further stabilized. Therefore, the tearing stability of the side joint portion 8 can be enhanced.

The basis weight of the first skin side sheet P1 is preferably 10 g/m ² or more, more preferably 12 g/m ² or more, and preferably 30 g/m ² or less, more preferably 25 g/m ² or less.
The basis weight of the second skin side sheet P2 is preferably 12 g/m ² or more, more preferably 14 g/m ² or more, and preferably 40 g/m ² or less, more preferably 30 g/m ² or less.

<Second embodiment>
In the above-described first embodiment, as the folded structure of the exterior body 5, a configuration in which only the outer layer sheet 51 is folded has been described, but the present invention is not limited to this.
In this embodiment, as shown in FIG. 8, both the outer layer sheet 51 and the inner layer sheet 52 may be folded.
In the following second to fourth embodiments, the same reference numerals are assigned to the same configurations as in the above-described first embodiment, and the description thereof will be omitted.

In the example shown in FIG. 8, the outer layer sheet 51 and the inner layer sheet 52 are folded back toward the skin from the waist opening end Wa. The leg-side ends of the outer layer sheet 51 and the inner layer sheet 52 in the folded region are arranged at substantially the same position in the longitudinal direction X. As shown in FIG.

In the waist region 8c, in the plurality of thermoplastic sheets 50 of the exterior body 5, the skin-side sheet P forming the skin-facing surface is the folded outer layer sheet 51, and the adjacent sheet Q adjacent to the skin-side sheet P is folded. The inner layer sheet 52 is formed.
In this case, as in the first embodiment, the fusion strength reducing agent 9 is preferably arranged between the skin-side sheet P and the adjacent sheet Q in the waist region 8c. In the example shown in FIG. 8, the fusion bond strength reducing agent 9 is disposed between the folded outer layer sheet 51 and the folded inner layer sheet 52 adjacent thereto. As a result, the fusion strength reducing agent 9 is arranged near the joint interface of the side joint portion 8, and the joint strength of the intersection portion 9s can be effectively reduced.
From the viewpoint of further improving tearability, it is preferable that the penetration depth of the fusion strength reducing agent 9 in the skin side sheet P is deeper than the penetration depth of the fusion strength reducing agent 9 in the adjacent sheet Q.
In the example shown in FIG. 8, the fusion bond strength reducing agent 9 is arranged in the dorsal region 5b, but as described above, it may be arranged in the ventral region 5a, and the ventral region 5a and the dorsal region It may be arranged in both regions 5b.

Further, as in the first embodiment, also in this embodiment, the side joint portion 8 includes a first lamination region T1 in which three or more thermoplastic sheets 50 are laminated including the first skin side sheet P1, and a second skin side sheet P1. and a second lamination region T2 in which a smaller number of thermoplastic sheets 50 than the first lamination region T1 including the side sheet P2 are laminated. In this example, the first lamination area T1 corresponds to the area where the exterior body 5 is folded back, and the skin-side sheet P in the waist area 8c corresponds to the first skin-side sheet P1.

In the example shown in FIG. 8, the first lamination region T1 of the ventral region 5a includes an unfolded outer layer sheet 51, an unfolded inner layer sheet 52, a folded inner layer sheet 52, and a folded outer layer sheet. 51 and 4 layers. The first lamination region T1 of the dorsal region 5b is also composed of the same four layers. Thus, the first lamination region T1 is composed of eight layers in total. In the first lamination region T1, the first skin side sheet P1 is composed of the outer layer sheet 51 folded back.
In the example shown in FIG. 8, the second laminated region T2 of the ventral region 5a is composed of two layers, an outer layer sheet 51 that is not folded back and an inner layer sheet 52 that is not folded back. The second laminated region T2 of the dorsal region 5b is also composed of two similar layers. Thus, the second lamination region T2 is composed of a total of four layers. In the second lamination region T2, the second skin side sheet P2 is composed of the inner layer sheet 52 that is not folded back.

Also in this embodiment, from the viewpoint of further stabilizing the joint strength in the entire side joint portion 8, it is preferable to configure the first skin-side sheet P1 and the second skin-side sheet P2 as follows.
For example, the first skin-side sheet P1 and the second skin-side sheet P2 are each preferably composed of a spunbond nonwoven fabric including a plurality of embossed portions 12, and the area ratio of the embossed portions 12 in the first skin-side sheet P1 is is preferably larger than the area ratio of the embossed portion 12 in the second skin side sheet P2 from the viewpoint of further stabilizing the joint strength in the entire side joint portion 8 .
For example, also in this embodiment, the melting point of the first skin side sheet P1 is preferably higher than the melting point of the second skin side sheet P2 from the viewpoint of further stabilizing the joint strength in the entire side joint portion 8 .
For example, also in the present embodiment, the basis weight of the first skin-side sheet P1 is preferably lower than the basis weight of the second skin-side sheet P2.

Also in the pants-type absorbent article having the side joints 8 of the present embodiment, in addition to the above configuration, the fusion bonding strength reducing agent 9 and the first cross-sealed portion S1 and the second cross-sealed portion S2 are the first embodiment. By having the same configuration as , it is possible to achieve both prevention of peeling during wearing and wearing, and ease of tearing at the time of disposal.

<Third Embodiment>
The configuration of the exterior body 5 having the folded structure is not limited to the above example. For example, the positions of the folded end portion 51a, which is the end portion of the folded region of the outer layer sheet 51, and the folded end portion 52a, which is the end portion of the folded region of the inner layer sheet 52, may differ in the longitudinal direction X. .
In the example shown in FIG. 9 , the folded end portion 52 a of the inner layer sheet 52 is positioned closer to the waist in the longitudinal direction X than the folded end portion 51 a of the outer layer sheet 51 .

In the example shown in FIG. 9, both the outer layer sheet 51 and the inner layer sheet 52 are folded back in the waist region 8c. In this case, the skin-side sheet P forming the skin-facing surface is the folded outer layer sheet 51 , and the adjacent sheet Q adjacent to the skin-side sheet P is the folded inner layer sheet 52 .
In this case, as in the first embodiment, the fusion bond strength reducing agent 9 is preferably arranged between the skin-side sheet P and the adjacent sheet Q in the waist region 8c. In the example shown in FIG. 9, the fusion bond strength reducing agent 9 is disposed between the folded outer layer sheet 51 and the folded inner layer sheet 52 adjacent thereto.
From the viewpoint of further improving tearability, it is preferable that the penetration depth of the fusion strength reducing agent 9 in the skin side sheet P is deeper than the penetration depth of the fusion strength reducing agent 9 in the adjacent sheet Q.
In the example shown in FIG. 9, the fusion bond strength reducing agent 9 is arranged in the ventral region 5a, but as described above, it may be arranged in the dorsal region 5b, and the ventral region 5a and the dorsal region It may be arranged in both regions 5b.

Further, as in the second embodiment, also in this embodiment, the side joint portion 8 includes a first lamination region T1 in which three or more thermoplastic sheets 50 including the first skin side sheet P1 are laminated, and a second skin side sheet P1. and a second lamination region T2 in which a smaller number of thermoplastic sheets 50 than the first lamination region T1 including the side sheets P2 are laminated. In this example, the first lamination area T1 corresponds to the area where the exterior body 5 is folded back, and the skin-side sheet P in the waist area 8c corresponds to the first skin-side sheet P1.
Furthermore, in the present embodiment, the first lamination region T1 includes regions in which the thermoplastic sheets 50 are laminated in different numbers. That is, the first lamination region T1 includes a leg-side lamination region T12 adjacent to the second lamination region T2 and having more thermoplastic sheets 50 laminated than the second lamination region T2, and a leg-side lamination region T12 having more than the leg-side lamination region T12. and a waist-side laminated region T11 in which several thermoplastic sheets 50 are laminated.
In the example shown in FIG. 9, the waist region 8c is included in the waist side laminated region T11.

In the example shown in FIG. 9, the waist-side laminated region T11 of the ventral region 5a includes an unfolded outer layer sheet 51, an unfolded inner layer sheet 52, a folded inner layer sheet 52, and a folded outer layer sheet. 51 and 4 layers. The waist-side lamination region T11 of the back region 5b is also composed of the same four layers. Thus, the waist-side lamination region T11 is composed of a total of eight layers.
Also, the leg-side lamination region T12 of the ventral region 5a is composed of three layers: an outer layer sheet 51 that is not folded, an inner layer sheet 52 that is not folded, and an outer layer sheet 51 that is folded. The leg-side lamination region T12 of the dorsal region 5b is also composed of the same three layers. Thus, the leg-side lamination region T12 is composed of a total of six layers.
In both the waist-side laminated region T11 and the leg-side laminated region T12, the first skin-side sheet P1 is composed of the folded outer layer sheet 51 .
In the example shown in FIG. 9, the second laminated region T2 of the ventral region 5a is composed of two layers, an outer layer sheet 51 that is not folded back and an inner layer sheet 52 that is not folded back. The second laminated region T2 of the dorsal region 5b is also composed of two similar layers. Thus, the second lamination region T2 is composed of a total of four layers. In the second lamination region T2, the second skin side sheet P2 is composed of the inner layer sheet 52 that is not folded back.

Also in this embodiment, from the viewpoint of further stabilizing the joint strength in the entire side joint portion 8, it is preferable to configure the first skin-side sheet P1 and the second skin-side sheet P2 as follows.
For example, the first skin-side sheet P1 and the second skin-side sheet P2 are each preferably composed of a spunbond nonwoven fabric including a plurality of embossed portions 12, and the area ratio of the embossed portions 12 in the first skin-side sheet P1 is is preferably larger than the area ratio of the embossed portion 12 in the second skin side sheet P2 from the viewpoint of further stabilizing the joint strength in the entire side joint portion 8 .
For example, also in this embodiment, the melting point of the first skin side sheet P1 is preferably higher than the melting point of the second skin side sheet P2 from the viewpoint of further stabilizing the joint strength in the entire side joint portion 8 .
For example, also in the present embodiment, the basis weight of the first skin-side sheet P1 is preferably lower than the basis weight of the second skin-side sheet P2.

Also in the pants-type absorbent article having the side joints 8 of the present embodiment, in addition to the above configuration, the fusion bonding strength reducing agent 9 and the first cross-sealed portion S1 and the second cross-sealed portion S2 are the first embodiment. By having the same configuration as , it is possible to achieve both prevention of peeling during wearing and wearing, and ease of tearing at the time of disposal.

<Fourth Embodiment>
The pants-type absorbent article of the present invention is not limited to an example in which the outer body 5 has the folded structure as in each of the embodiments described above, and the outer body 5 may not have the folded structure.
In this embodiment, as shown in FIG. 10, both the outer layer sheet 51 and the inner layer sheet 52 may not be folded back, and the edges of these sheets may coincide with the waist opening edge Wa.
That is, in this example, the exterior body 5 as a whole is composed of the same number of laminations, and for example, the ventral region 5a and the dorsal region 5b are composed of two layers, the outer layer sheet 51 and the inner layer sheet 52, respectively.

That is, in the waist region 8c of the side joint portion 8, in the plurality of thermoplastic sheets 50 of the outer body 5, the skin-side sheet P constituting the skin-facing surface is the inner layer sheet 52, and the adjacent sheet adjacent to the skin-side sheet P Q becomes the outer layer sheet 51 .
Also in this case, as in the first embodiment, the fusion bond strength reducing agent 9 is added to the skin side sheet P and the adjacent sheet Q in the waist region 8c from the viewpoint of effectively reducing the bonding strength of the crossing portion 9s. is preferably placed between In the example shown in FIG. 10, the fusion bond strength reducing agent 9 is placed between the inner layer sheet 52 and the adjacent outer layer sheet 51 .
In addition, from the viewpoint of more effectively reducing the bonding strength of the crossing portion 9s, the penetration depth of the fusion strength reducing agent 9 in the skin side sheet P is greater than the penetration depth of the fusion strength reducing agent 9 in the adjacent sheet Q. Deep is preferred.
In the example shown in FIG. 10, the fusion bond strength reducing agent 9 is disposed in both the ventral region 5a and the dorsal region 5b. may be placed in

Moreover, in the present embodiment, the skin-side sheet P is preferably made of the same nonwoven fabric over the entire side joints 8 from the viewpoint of further stabilizing the joint strength in the entire side joints 8 .
For example, the skin-side sheet P is preferably composed of a spunbond nonwoven fabric including a plurality of embossed portions 12, and the distance between the embossed portions 12 is preferably substantially constant throughout the side joints 8. . In addition, "the distance between the embossed portions 12 is substantially constant" means that when the shortest distances between the embossed portions 12 at 10 or more places are compared, the smallest distance is 100%, and the largest distance is It means that it is within 110%.
For example, in the present embodiment, the melting point of the skin-side sheet P is preferably substantially constant throughout the side joint portion 8 . "The melting point of the skin side sheet P is substantially constant in the entire side joint portion 8" means that when the melting points of the skin side sheet P at 10 or more locations in the side joint portion 8 are compared, the lowest melting point is set to 100. %, the highest melting point is 110% or less.
For example, in the present embodiment, the basis weight of the skin-side sheet P is preferably substantially constant throughout the side joints 8 . "The basis weight of the skin-side sheet P is substantially constant over the entire side joint portion 8" means that the basis weight of the skin-side sheet P at 10 or more locations in the side joint portion 8 is the lowest basis weight. When the amount is 100%, it means that the highest basis weight falls within 110% or less.

Also in the pants-type absorbent article having the side joints 8 of the present embodiment, in addition to the above configuration, the fusion bonding strength reducing agent 9 and the first cross-sealed portion S1 and the second cross-sealed portion S2 are the first embodiment. By having the same configuration as , it is possible to achieve both prevention of peeling during wearing and wearing, and ease of tearing at the time of disposal.

<Other embodiments>
Although the embodiments of the present invention have been described above, the present invention is not limited to the above-described embodiments, and it goes without saying that various modifications can be made without departing from the gist of the present invention.

For example, in the above-described embodiment, the outer body 5 has the ventral area 5a, the dorsal area 5b, and the crotch area 5c, but the present invention is not limited to this. For example, the outer body 5 may have a configuration in which an abdominal region and a dorsal region are divided without having a crotch region.

The pants-type absorbent article according to the present invention may not be a disposable diaper for infants, but may be, for example, a disposable diaper for adults or children. Furthermore, the pants-type absorbent article according to the present invention does not have to be a disposable diaper as long as it is an absorbent article of the type worn on the lower half of the body. Such pants-type absorbent articles include, for example, pants-type sanitary napkins.

This invention discloses the following absorbent articles further regarding embodiment mentioned above.
<1>
A longitudinal direction extending from the wearer's abdomen to the dorsal side through the crotch region, comprising an absorbent body and an outer body that includes a plurality of thermoplastic sheets and is disposed on the non-skin-facing side of the absorbent body. and a horizontal direction orthogonal to the vertical direction, wherein the pants-type absorbent article has
The exterior body is
a ventral region located on the ventral side of the wearer;
a dorsal region positioned on the dorsal side of the wearer;
a pair of side joints in which a side edge of the ventral region in the lateral direction and a side edge of the dorsal region in the lateral direction are respectively joined,
each of the pair of side joints has a waist end and a leg end that form both ends in the vertical direction;
At least one of the side joints is
a plurality of seal portions each extending in the lateral direction and spaced apart in the longitudinal direction;
a fusion bonding strength reducing agent disposed between the thermoplastic sheets and extending linearly;
The plurality of seal portions are
including an inner end that is the laterally inner end and an outer end that is the laterally outer end, and
The seal portion is disposed in a waist region positioned within 25 mm in the longitudinal direction from the waist end portion, and intersects with the fusion bond strength reducing agent at portions other than the inner end portion and the outer end portion in plan view. including a first cross seal and a second cross seal,
The first cross seal portion and the second cross seal portion are
arranged next to each other in order from the waist end side toward the leg end side,
The side joint portion including the first cross seal portion and the second cross seal portion,
The intersection angle between the fusion strength reducing agent and the first cross seal portion on the waist end side and inward in the lateral direction is α1, and the fusion strength reduction agent and the first cross seal portion are: The laterally outer crossing angle on the leg end side is α2, and the laterally inner crossing angle on the waist end side between the fusion strength reducing agent and the second cross seal portion Underpants that satisfy the following formula (1), where α3 is the intersection angle between the fusion strength reducing agent and the second intersection seal portion on the leg end side and in the lateral direction outside as α4. type absorbent article.
5 degrees < α1 ≤ α2 < α3 ≤ α4 < 90 degrees (1)
<2>
The underpants-type absorbent article according to <1>, wherein the side joints including the first cross seal part and the second cross seal part satisfy the following formula (1)′.
5 degrees<α1<α2<α3<α4<90 degrees (1)'
<3>
The plurality of thermoplastic sheets includes, in the waist region, a skin-side sheet that constitutes the skin-facing surface of the outer package and an adjacent sheet adjacent thereto,
The underpants-type absorbent article according to <1> or <2>, wherein the fusion bonding strength reducing agent is disposed between the skin-side sheet and the adjacent sheet.
<4>
The underpants-type absorbent article according to <3>, wherein the penetration depth of the fusion strength-reducing agent in the skin-side sheet is greater than the penetration depth of the fusion strength-reducing agent in the adjacent sheet.
<5>
The underpants-type absorbent article according to any one of <1> to <4>, wherein the first cross seal portion is arranged at a position closest to the waist end portion among the plurality of seal portions.
<6>
The ventral region and the dorsal region, respectively,
a waist elastic region in which a plurality of elastic members extending in the horizontal direction are arranged and located within 25 mm in the vertical direction from the waist opening end;
a leg-side stretchable region in which a plurality of elastic members extending in the horizontal direction are arranged and located closer to the leg side in the vertical direction than the waist stretchable region;
The pants according to any one of <1> to <5>, wherein an average stretch rate of the plurality of elastic members in the waist stretch region is lower than an average stretch rate of the plurality of elastic members in the leg side stretch region. type absorbent article.
<7>
The plurality of seal portions are
The seal portions intersecting with the fusion strength reducing agent, comprising 3 or more n cross seal portions including the first cross seal portion and the second cross seal portion,
The side joint portion including the three or more cross seal portions,
n is an integer of 3 or more, k is an integer of 2 or more and n or less,
The intersection angle between the k-th cross seal portion on the leg end side from the first cross seal portion and the fusion bond strength reducing agent on the waist end side and in the lateral direction is α(2k -1) When the crossing angle of the k-th crossing seal portion and the fusion bond strength reducing agent on the side of the leg end portion and on the outside in the lateral direction is α(2k), the following The pants-type absorbent article according to any one of <1> to <6>, which satisfies formulas (2) and (3).
α(2(k−1)−1)≦α(2(k−1))<α(2k−1)≦α(2k) (2)
5 degrees < α1 ≤ α2 < ... < α (2n-1) ≤ α (2n) ≤ 90 degrees (3)
<8>
The underpants-type absorbent article according to <7>, wherein the side joint portion including the three or more cross seal portions satisfies the following formulas (2)′ and (3)′.
α(2(k−1)−1)<α(2(k−1))<α(2k−1)<α(2k) (2)′
5 degrees<α1<α2<...<α(2n-1)<α(2n)≦90 degrees...(3)'
<9>
All of the seal portions located in the intersection region within 10 mm from the waist end side end of the first cross seal portion to the leg end side cross the fusion bond strength reducing agent as cross seal portions. configured,
At the intersection seal portion in the intersection region,
The distance from the inner end to the intersecting portion with the fusion bond strength reducing agent gradually increases toward the leg end,
The underpants-type absorbent article according to any one of <1> to <8>, wherein the intersection portions of all the intersection seal portions in the intersection region do not overlap the outer end portions in plan view.
<10>
The width in the lateral direction of the crossing portion between the first cross seal portion and the fusion strength reducing agent is substantially the width in the cross direction of the crossing portion between the second cross seal portion and the fusion strength reducing agent. The pants-type absorbent article according to any one of <1> to <9>, which are essentially the same.
<11>
The underpants-type absorbent article according to any one of <1> to <10>, wherein the fusion bonding strength reducing agent is composed of at least part of a spiral or wavy curve.
<12>
Each of the pair of side joints includes:
a plurality of seal portions each extending in the lateral direction and spaced apart in the longitudinal direction;
a fusion bonding strength reducing agent disposed between the thermoplastic sheets and extending linearly;
The plurality of seal portions of each of the pair of side joints,
including an inner end that is the laterally inner end and an outer end that is the laterally outer end, and
A first cross seal that is disposed in a waist region positioned within 25 mm from the waist end and that crosses the fusion bond strength reducing agent at a portion other than the inner end and the outer end in a plan view. and a second cross-seal portion, respectively;
The first cross seal portion and the second cross seal portion of each of the pair of side joints are arranged adjacent to each other in order from the waist end side toward the leg end side,
Each of the pair of side joints includes:
The intersection angle between the fusion strength reducing agent and the first cross seal portion on the waist end side and inward in the lateral direction is α1, and the fusion strength reduction agent and the first cross seal portion are: The laterally outer crossing angle on the leg end side is α2, and the laterally inner crossing angle on the waist end side between the fusion strength reducing agent and the second cross seal portion where α3 is the crossing angle of the fusion bond strength reducing agent and the second cross seal portion on the leg end side and the laterally outer side, where α2 satisfies the above formula (1) <1 The underpants-type absorbent article according to any one of > to <11>.
<13>
In the waist region, the skin-side sheet that constitutes the skin-facing surface of the exterior body is composed of a spunbond nonwoven fabric including a plurality of embossed portions,
Each of the first cross seal portion and the second cross seal portion overlaps with at least one embossed portion other than the inner end portion and the outer end portion in plan view, and
Any one of <1> to <12>, wherein the overlapping portion of the first cross seal portion and the embossed portion is located outside the overlapping portion of the second cross seal portion and the embossed portion in the lateral direction. The pants-type absorbent article according to 1.
<14>
The side joints are
a first lamination region in which three or more thermoplastic sheets including a first skin-side sheet constituting a skin-facing surface are laminated;
a second lamination region in which a smaller number of the thermoplastic sheets than the first lamination region are laminated, including a second skin-side sheet that constitutes the skin-facing surface;
The first skin-side sheet and the second skin-side sheet are each composed of a spunbond nonwoven fabric including a plurality of embossed portions,
The area ratio of the embossed portion in the first skin-side sheet is higher than the area ratio of the embossed portion in the second skin-side sheet Pants-type absorbency according to any one of <1> to <13> Goods.
<15>
The side joints are
a first lamination region in which three or more thermoplastic sheets including a first skin-side sheet constituting a skin-facing surface are laminated;
a second lamination region in which a smaller number of the thermoplastic sheets than the first lamination region are laminated, including a second skin-side sheet that constitutes the skin-facing surface;
The underpants-type absorbent article according to any one of <1> to <14>, wherein the melting point of the first skin-side sheet is higher than the melting point of the second skin-side sheet.
<16>
The side joints are
a first lamination region in which three or more thermoplastic sheets including a first skin-side sheet constituting a skin-facing surface are laminated;
a second lamination region in which a smaller number of the thermoplastic sheets than the first lamination region are laminated, including a second skin-side sheet that constitutes the skin-facing surface;
The underpants-type absorbent article according to any one of <1> to <15>, wherein the basis weight of the first skin-side sheet is lower than the basis weight of the second skin-side sheet.

1 … Pants-type absorbent article (disposable diaper, diaper)
4 Absorbent main body 5 Exterior body 5a Abdominal region 5b Back region 50 Thermoplastic sheet 8 Side joint 8a Waist end 8b Leg end 9 Bonding strength reducing agent S Sealing portion S1 First intersection seal portion S2 Second intersection seal portion Sc Inner end Sd Outer end

It is preferable that each of the first cross-sealed portion S1 and the second cross-sealed portion S2 overlaps with at least one embossed portion 12 other than the inner end portion Sc and the outer end portion Sd in plan view.
That is, in the first cross-sealed portion S1 and the second cross-sealed portion S2, if the portion overlapping the embossed portion 12 in plan view is the overlapping portion 12s, the overlapping portion 12s is positioned at the inner end portion Sc and the outer end portion Sd. Instead, it is preferably located between the inner end Sc and the outer end Sd.
Further, the overlapping portion 12s between the second cross-sealed portion S1 and the embossed portion 12 is preferably located outside the overlapping portion 12s between the first cross-sealed portion S2 and the embossed portion 12 in the horizontal direction Y.
The position of the overlapping portion 12s of each sealing portion S is compared by the distance in the horizontal direction Y from the inner end portion Sc of each sealing portion S to the overlapping portion 12s. The distance in the horizontal direction Y from the inner end Sc of each seal portion S to the overlapping portion 12s means the distance in the horizontal direction Y from the inner end Sc to the innermost portion in the horizontal direction Y of the overlapping portion 12s. That is, the distance e2 in the horizontal direction Y from the inner end Sc of the second cross seal portion S2 to the overlapping portion 12s is equal to the distance e1 in the lateral direction Y from the inner end Sc of the first cross seal portion S1 to the overlapping portion 12s. is preferably greater than

This invention discloses the following absorbent articles further regarding embodiment mentioned above.
<1>
A longitudinal direction extending from the wearer's abdomen to the dorsal side through the crotch region, comprising an absorbent body and an outer body that includes a plurality of thermoplastic sheets and is disposed on the non-skin-facing side of the absorbent body. and a horizontal direction orthogonal to the vertical direction, wherein the pants-type absorbent article has
The exterior body is
a ventral region located on the ventral side of the wearer;
a dorsal region positioned on the dorsal side of the wearer;
a pair of side joints in which a side edge of the ventral region in the lateral direction and a side edge of the dorsal region in the lateral direction are respectively joined,
each of the pair of side joints has a waist end and a leg end that form both ends in the vertical direction;
At least one of the side joints is
a plurality of seal portions each extending in the lateral direction and spaced apart in the longitudinal direction;
a fusion bonding strength reducing agent disposed between the thermoplastic sheets and extending linearly;
The plurality of seal portions are
including an inner end that is the laterally inner end and an outer end that is the laterally outer end, and
The seal portion is disposed in a waist region positioned within 25 mm in the longitudinal direction from the waist end portion, and intersects with the fusion bond strength reducing agent at portions other than the inner end portion and the outer end portion in plan view. including a first cross seal and a second cross seal,
The first cross seal portion and the second cross seal portion are
arranged next to each other in order from the waist end side toward the leg end side,
The side joint portion including the first cross seal portion and the second cross seal portion,
The intersection angle between the fusion strength reducing agent and the first cross seal portion on the waist end side and inward in the lateral direction is α1, and the fusion strength reduction agent and the first cross seal portion are: The laterally outer crossing angle on the leg end side is α2, and the laterally inner crossing angle on the waist end side between the fusion strength reducing agent and the second cross seal portion Underpants that satisfy the following formula (1), where α3 is the intersection angle between the fusion strength reducing agent and the second intersection seal portion on the leg end side and in the lateral direction outside as α4. type absorbent article.
5 degrees < α1 ≤ α2 < α3 ≤ α4 < 90 degrees (1)
<2>
The underpants-type absorbent article according to <1>, wherein the side joints including the first cross seal part and the second cross seal part satisfy the following formula (1)′.
5 degrees<α1<α2<α3<α4<90 degrees (1)'
<3>
The plurality of thermoplastic sheets includes, in the waist region, a skin-side sheet that constitutes the skin-facing surface of the outer package and an adjacent sheet adjacent thereto,
The underpants-type absorbent article according to <1> or <2>, wherein the fusion bonding strength reducing agent is disposed between the skin-side sheet and the adjacent sheet.
<4>
The underpants-type absorbent article according to <3>, wherein the penetration depth of the fusion strength-reducing agent in the skin-side sheet is greater than the penetration depth of the fusion strength-reducing agent in the adjacent sheet.
<5>
The underpants-type absorbent article according to any one of <1> to <4>, wherein the first cross seal portion is arranged at a position closest to the waist end portion among the plurality of seal portions.
<6>
The ventral region and the dorsal region, respectively,
a waist elastic region in which a plurality of elastic members extending in the horizontal direction are arranged and located within 25 mm in the vertical direction from the waist opening end;
a leg-side stretchable region in which a plurality of elastic members extending in the horizontal direction are arranged and located closer to the leg side in the vertical direction than the waist stretchable region;
The pants according to any one of <1> to <5>, wherein an average stretch rate of the plurality of elastic members in the waist stretch region is lower than an average stretch rate of the plurality of elastic members in the leg side stretch region. type absorbent article.
<7>
The plurality of seal portions are
The seal portions intersecting with the fusion strength reducing agent, comprising 3 or more n cross seal portions including the first cross seal portion and the second cross seal portion,
The side joint portion including the three or more cross seal portions,
n is an integer of 3 or more, k is an integer of 2 or more and n or less,
The intersection angle between the k-th cross seal portion on the leg end side from the first cross seal portion and the fusion bond strength reducing agent on the waist end side and in the lateral direction is α(2k -1) When the crossing angle of the k-th crossing seal portion and the fusion bond strength reducing agent on the side of the leg end portion and on the outside in the lateral direction is α(2k), the following The pants-type absorbent article according to any one of <1> to <6>, which satisfies formulas (2) and (3).
α(2(k−1)−1)≦α(2(k−1))<α(2k−1)≦α(2k) (2)
5 degrees < α1 ≤ α2 < ... < α (2n-1) ≤ α (2n) ≤ 90 degrees (3)
<8>
The underpants-type absorbent article according to <7>, wherein the side joint portion including the three or more cross seal portions satisfies the following formulas (2)′ and (3)′.
α(2(k−1)−1)<α(2(k−1))<α(2k−1)<α(2k) (2)′
5 degrees<α1<α2<...<α(2n-1)<α(2n)≦90 degrees...(3)'
<9>
All of the seal portions located in the intersection region within 10 mm from the waist end side end of the first cross seal portion to the leg end side cross the fusion bond strength reducing agent as cross seal portions. configured,
At the intersection seal portion in the intersection region,
The distance from the inner end to the intersecting portion with the fusion bond strength reducing agent gradually increases toward the leg end,
The underpants-type absorbent article according to any one of <1> to <8>, wherein the intersection portions of all the intersection seal portions in the intersection region do not overlap the outer end portions in plan view.
<10>
The width in the lateral direction of the crossing portion between the first cross seal portion and the fusion strength reducing agent is substantially the width in the cross direction of the crossing portion between the second cross seal portion and the fusion strength reducing agent. The pants-type absorbent article according to any one of <1> to <9>, which are essentially the same.
<11>
The underpants-type absorbent article according to any one of <1> to <10>, wherein the fusion bonding strength reducing agent is composed of at least part of a spiral or wavy curve.
<12>
Each of the pair of side joints includes:
a plurality of seal portions each extending in the lateral direction and spaced apart in the longitudinal direction;
a fusion bonding strength reducing agent disposed between the thermoplastic sheets and extending linearly;
The plurality of seal portions of each of the pair of side joints,
including an inner end that is the laterally inner end and an outer end that is the laterally outer end, and
A first cross seal that is disposed in a waist region positioned within 25 mm from the waist end and that crosses the fusion bond strength reducing agent at a portion other than the inner end and the outer end in a plan view. and a second cross-seal portion, respectively;
The first cross seal portion and the second cross seal portion of each of the pair of side joints are arranged adjacent to each other in order from the waist end side toward the leg end side,
Each of the pair of side joints includes:
The intersection angle between the fusion strength reducing agent and the first cross seal portion on the waist end side and inward in the lateral direction is α1, and the fusion strength reduction agent and the first cross seal portion are: The laterally outer crossing angle on the leg end side is α2, and the laterally inner crossing angle on the waist end side between the fusion strength reducing agent and the second cross seal portion where α3 is the intersection angle between the fusion strength reducing agent and the second intersection seal portion on the leg end side and the laterally outer side is α 4 , the expression (1) is satisfied. The pants-type absorbent article according to any one of 1> to <11>.
<13>
In the waist region, the skin-side sheet that constitutes the skin-facing surface of the exterior body is composed of a spunbond nonwoven fabric including a plurality of embossed portions,
Each of the first cross seal portion and the second cross seal portion overlaps with at least one embossed portion other than the inner end portion and the outer end portion in plan view, and
Any one of <1> to <12>, wherein the overlapping portion of the second cross seal portion and the embossed portion is located laterally outside the overlapping portion of the first cross seal portion and the embossed portion The pants-type absorbent article according to 1.
<14>
The side joints are
a first lamination region in which three or more thermoplastic sheets including a first skin-side sheet constituting a skin-facing surface are laminated;
a second lamination region in which a smaller number of the thermoplastic sheets than the first lamination region are laminated, including a second skin-side sheet that constitutes the skin-facing surface;
The first skin-side sheet and the second skin-side sheet are each composed of a spunbond nonwoven fabric including a plurality of embossed portions,
The area ratio of the embossed portion in the first skin-side sheet is higher than the area ratio of the embossed portion in the second skin-side sheet Pants-type absorbency according to any one of <1> to <13> Goods.
<15>
The side joints are
a first lamination region in which three or more thermoplastic sheets including a first skin-side sheet constituting a skin-facing surface are laminated;
a second lamination region in which a smaller number of the thermoplastic sheets than the first lamination region are laminated, including a second skin-side sheet that constitutes the skin-facing surface;
The underpants-type absorbent article according to any one of <1> to <14>, wherein the melting point of the first skin-side sheet is higher than the melting point of the second skin-side sheet.
<16>
The side joints are
a first lamination region in which three or more thermoplastic sheets including a first skin-side sheet constituting a skin-facing surface are laminated;
a second lamination region in which a smaller number of the thermoplastic sheets than the first lamination region are laminated, including a second skin-side sheet that constitutes the skin-facing surface;
The underpants-type absorbent article according to any one of <1> to <15>, wherein the basis weight of the first skin-side sheet is lower than the basis weight of the second skin-side sheet.

Claims (13)

A longitudinal direction extending from the wearer's abdomen to the dorsal side through the crotch region, comprising an absorbent body and an outer body that includes a plurality of thermoplastic sheets and is disposed on the non-skin-facing side of the absorbent body. and a horizontal direction orthogonal to the vertical direction, wherein the pants-type absorbent article has
The exterior body is
a ventral region located on the ventral side of the wearer;
a dorsal region positioned on the dorsal side of the wearer;
a pair of side joints in which the side edges of the ventral region in the lateral direction and the side edges of the dorsal region in the lateral direction are respectively joined,
each of the pair of side joints has a waist end and a leg end that form both ends in the vertical direction;
At least one of the pair of side joints,
a plurality of seal portions each extending in the lateral direction and spaced apart in the longitudinal direction;
a fusion bonding strength reducing agent disposed between the thermoplastic sheets and extending linearly;
The plurality of seal portions are
including an inner end that is the laterally inner end and an outer end that is the laterally outer end, and
The seal portion is disposed in the waist region positioned within 25 mm in the longitudinal direction from the waist end portion, and intersects with the fusion bonding strength reducing agent at portions other than the inner end portion and the outer end portion in plan view. including a first cross seal and a second cross seal,
The first cross seal portion and the second cross seal portion are
arranged next to each other in order from the waist end side toward the leg end side,
The side joint portion including the first cross seal portion and the second cross seal portion,
The intersection angle between the fusion strength reducing agent and the first cross seal portion on the waist end side and inward in the lateral direction is α1, and the fusion strength reduction agent and the first cross seal portion The laterally outer crossing angle on the leg end side is α2, and the laterally inner crossing angle on the waist end side between the fusion strength reducing agent and the second cross seal portion Underpants that satisfy the following formula (1), where α3 is the crossing angle of the fusion strength reducing agent and the second cross seal portion on the leg end side and the laterally outer side is α4. type absorbent article.
5 degrees < α1 ≤ α2 < α3 ≤ α4 < 90 degrees (1) 2. The pants-type absorbent article according to claim 1, wherein the side joints including the first cross seals and the second cross seals satisfy the following formula (1)'.
5 degrees<α1<α2<α3<α4<90 degrees (1)' The plurality of thermoplastic sheets includes, in the waist region, a skin-side sheet that constitutes the skin-facing surface of the outer package and an adjacent sheet adjacent thereto,
The underpants-type absorbent article according to claim 1 or 2, wherein the agent for reducing fusion bond strength is arranged between the skin-side sheet and the adjacent sheet. The underpants-type absorbent article according to any one of claims 1 to 3, wherein the first cross seal portion is arranged at a position closest to the waist end portion among the plurality of seal portions. The ventral region and the dorsal region, respectively,
a waist elastic region in which a plurality of elastic members extending in the horizontal direction are arranged and located within 25 mm in the vertical direction from the waist opening end;
a leg-side stretchable region in which a plurality of elastic members extending in the horizontal direction are arranged and located closer to the leg side in the vertical direction than the waist stretchable region;
The pants-type absorbent according to any one of claims 1 to 4, wherein an average stretch rate of the plurality of elastic members in the waist stretch region is lower than an average stretch rate of the plurality of elastic members in the leg side stretch region. sexual goods. The plurality of seal portions are
The seal portions intersecting with the fusion strength reducing agent, comprising 3 or more n cross seal portions including the first cross seal portion and the second cross seal portion,
The side joint portion including the three or more cross seal portions,
n is an integer of 3 or more, k is an integer of 2 or more and n or less,
The intersection angle between the k-th cross seal portion on the leg end side from the first cross seal portion and the fusion bond strength reducing agent on the waist end side and in the lateral direction is α(2k -1) When the crossing angle of the k-th crossing seal portion and the fusion bond strength reducing agent on the side of the leg end portion and on the outside in the lateral direction is α(2k), the following 6. The pants-type absorbent article according to any one of claims 1 to 5, satisfying formulas (2) and (3).
α(2(k−1)−1)≦α(2(k−1))<α(2k−1)≦α(2k) (2)
5 degrees < α1 ≤ α2 < ... < α (2n-1) ≤ α (2n) ≤ 90 degrees (3) 7. The pants-type absorbent article according to claim 6, wherein the side joints including the three or more cross seals satisfy the following formulas (2)' and (3)'.
α(2(k−1)−1)<α(2(k−1))<α(2k−1)<α(2k) (2)′
5 degrees<α1<α2<...<α(2n-1)<α(2n)≦90 degrees...(3)' All of the seal portions located in the cross area within 10 mm from the waist end side end of the first cross seal portion to the leg end side cross the fusion bond strength reducing agent as the cross seal portions. configured,
At the intersection seal portion in the intersection region,
The distance from the inner end to the intersecting portion with the fusion bond strength reducing agent gradually increases toward the leg end,
The pants-type absorbent article according to any one of claims 1 to 7, wherein the intersection portions of all the intersection seal portions in the intersection region do not overlap the outer end portions in plan view. Each of the pair of side joints includes:
a plurality of seal portions each extending in the lateral direction and spaced apart in the longitudinal direction;
a fusion bonding strength reducing agent disposed between the thermoplastic sheets and extending linearly;
The plurality of seal portions of each of the pair of side joints,
including an inner end that is the laterally inner end and an outer end that is the laterally outer end, and
A first cross seal that is disposed in a waist region positioned within 25 mm from the waist end and that crosses the fusion bond strength reducing agent at a portion other than the inner end and the outer end in a plan view. and a second cross-seal portion, respectively;
The first cross seal portion and the second cross seal portion of each of the pair of side joints are arranged adjacent to each other in order from the waist end side toward the leg end side,
Each of the pair of side joints includes:
The intersection angle between the fusion strength reducing agent and the first cross seal portion on the waist end side and inward in the lateral direction is α1, and the fusion strength reduction agent and the first cross seal portion are: The laterally outer crossing angle on the leg end side is α2, and the laterally inner crossing angle on the waist end side between the fusion strength reducing agent and the second cross seal portion wherein α3 satisfies the above formula (1), where α2 is the crossing angle of the fusion bond strength reducing agent and the second cross seal portion on the leg end side and the laterally outer side. 9. The pants-type absorbent article according to any one of 1 to 8. In the waist region, the skin-side sheet that constitutes the skin-facing surface of the exterior body is composed of a spunbond nonwoven fabric including a plurality of embossed portions,
Each of the first cross seal portion and the second cross seal portion overlaps with at least one embossed portion other than the inner end portion and the outer end portion in plan view, and
10. The overlapping portion of the first cross seal portion and the embossed portion is located outside in the lateral direction from the overlapping portion of the second cross seal portion and the embossed portion. A pant-type absorbent article as described. The side joints are
a first lamination region in which three or more thermoplastic sheets including a first skin-side sheet constituting a skin-facing surface are laminated;
a second lamination region in which a smaller number of the thermoplastic sheets than the first lamination region are laminated, including a second skin-side sheet that constitutes the skin-facing surface;
The first skin-side sheet and the second skin-side sheet are each composed of a spunbond nonwoven fabric including a plurality of embossed portions,
The underpants-type absorbent article according to any one of claims 1 to 10, wherein the area ratio of the embossed portions in the first skin-side sheet is higher than the area ratio of the embossed portions in the second skin-side sheet. The side joints are
a first lamination region in which three or more thermoplastic sheets including a first skin-side sheet constituting a skin-facing surface are laminated;
a second lamination region in which a smaller number of the thermoplastic sheets than the first lamination region are laminated, including a second skin-side sheet that constitutes the skin-facing surface;
The underpants-type absorbent article according to any one of claims 1 to 11, wherein the melting point of the first skin-side sheet is higher than the melting point of the second skin-side sheet. The side joints are
a first lamination region in which three or more thermoplastic sheets including a first skin-side sheet constituting a skin-facing surface are laminated;
a second lamination region in which a smaller number of the thermoplastic sheets than the first lamination region are laminated, including a second skin-side sheet that constitutes the skin-facing surface;
The underpants-type absorbent article according to any one of claims 1 to 12, wherein the basis weight of the first skin-side sheet is lower than the basis weight of the second skin-side sheet.

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