JP7338026B2 - Pants-type absorbent article - Google Patents

Description

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

Pants-type absorbent articles generally include an absorbent main body, an outer body, and side joints (side seal parts) that join the abdominal outer body and the dorsal outer body at side ends. there is The waist opening and the leg opening of the pants-type absorbent article are 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. Therefore, the side joints are required to have the function of not being peeled off during the wearing operation (when putting on the underpants-type absorbent article) and during wearing, and being able to be easily torn off at the time of disposal.

From this point of view, Patent Literature 1 discloses a pants-type absorbent article having a sealing portion that joins the lateral ends of the ventral portion and the dorsal portion of the outer package. In the underpants-type absorbent article, the seal portion includes a plurality of fused portions that are aligned in the longitudinal direction with a space therebetween, and at least two fused portions that are adjacent to each other among the fused portions are relatively A thin wall portion having a small thickness and a thick wall portion having a relatively large thickness are both located laterally inward of the fused portion.

Japanese Patent Application Laid-Open No. 2020-99618

On the other hand, in Patent Document 1, in the thin portion formed by compression in the thickness direction, the degree of fiber fusion may increase and the peel strength may increase. I had a difficult time.

TECHNICAL FIELD The present invention relates to provision of a pants-type absorbent article capable of achieving both prevention of peeling during wearing and wearing, and ease of tearing upon disposal.

The pants-type absorbent article according to one aspect of the present invention has a longitudinal direction extending from the wearer's abdomen through the crotch to the dorsal side, and a lateral direction perpendicular to the longitudinal direction and corresponding to the lateral direction of the wearer. and comprising an absorbent body, an outer body, and a pair of side joints.
The outer body is arranged on the non-skin-facing side of the absorbent main body, includes a ventral region and a dorsal region located on both sides in the longitudinal direction, and is constructed by laminating a plurality of thermoplastic sheets.
The pair of side joints joins the ventral region and the dorsal region of the exterior body at the side edges in the horizontal direction.
The pair of side joints are
a waist edge region within 25 mm in the longitudinal direction from the waist edge, which is the waist-side edge in the longitudinal direction;
and a leg end region within 25 mm in the longitudinal direction from the leg end, which is the leg-side end in the longitudinal direction.
At least one of the pair of side joints,
a row of long seals in which the plurality of long seal portions elongated in the lateral direction are aligned along the longitudinal direction and are arranged in at least one of the waist end region and the leg end region;
A plurality of short seal portions having a length in the horizontal direction shorter than that of the long seal portions are aligned along the longitudinal direction while being spaced apart from each other, and the short seal rows are arranged adjacent to the long seal rows in the longitudinal direction. and a seal row.
Each long seal portion includes an inner seal region located on the inner side in the lateral direction and an outer seal region located on the outer side in the lateral direction and having a higher seal strength than the inner seal region.

A pants-type absorbent article according to another aspect of the present invention has a longitudinal direction extending from the wearer's abdomen through the crotch to the dorsal side, and a lateral direction orthogonal to the longitudinal direction and corresponding to the lateral direction of the wearer. and a thickness direction perpendicular to the longitudinal direction and the lateral direction, and an absorbent main body, an exterior body, and a pair of side joints.
The outer body is arranged on the non-skin-facing side of the absorbent main body, includes a ventral region and a dorsal region located on both sides in the longitudinal direction, and is constructed by laminating a plurality of thermoplastic sheets.
The pair of side joints joins the ventral region and the dorsal region of the exterior body at the side edges in the horizontal direction.
The pair of side joints are
a waist edge region within 25 mm in the longitudinal direction from the waist edge, which is the waist-side edge in the longitudinal direction;
and a leg end region within 25 mm in the longitudinal direction from the leg end, which is the leg-side end in the longitudinal direction.
At least one of the pair of side joints,
The plurality of laterally elongated long seal portions are spaced apart and aligned along the longitudinal direction and have rows of long seals positioned in at least one of the waist end region or the leg end region.
Each long seal portion includes an inner seal region located on the inner side in the lateral direction and an outer seal region located on the outer side in the lateral direction and having a higher seal strength than the inner seal region.
The degree of melting of the fibers in the outer sealing region is higher than the degree of melting of the fibers in the inner sealing region.
When a cross section of the inner seal region parallel to the lateral direction and the thickness direction is observed at a magnification of 500, the inner seal region has unevenness formed in the thickness direction.

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. It is a figure which shows typically the microscope image which expanded the cross section of the said side joint part about 300 times. FIG. 4 is a diagram schematically showing a microscopic image of the seal portion of the side joint portion enlarged about 500 times, (A) showing the outer seal region of the long seal portion, and (B) showing the inner seal region of the long seal portion. . 4 is an enlarged view of a main part of FIG. 3; FIG. FIG. 10 is a schematic plan view showing a side joint portion of a pants-type absorbent article according to a modification of the embodiment; FIG. 10 is a schematic plan view showing a side joint portion of a pants-type absorbent article according to a modification of the embodiment; (A) and (B) are schematic plan views showing side joints of pants-type absorbent articles according to modifications of the above embodiment, respectively. 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. FIG. 4 is a schematic plan view showing a side joint portion of the underpants-type absorbent article, showing the positional relationship between a first laminated portion and a second laminated portion having different laminated numbers, and a seal portion. 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. FIG. 11 is a schematic plan view showing side joints of a pants-type absorbent article according to a fifth embodiment of the present invention; It is a typical top view which shows the side joint part which concerns on the modification of the said embodiment. FIG. 10 is a diagram schematically showing microscopic images of the long seal portions of the side joints of the pants-type absorbent article according to the sixth embodiment of the present invention, magnified about 500 times; (A) is the outer seal region; ) indicates the inner sealing area. FIG. 4 is a schematic plan view showing side joints of the pants-type absorbent article.

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 1L, and is worn around the wearer's waist and crotch when worn. The waist opening 1W has a waist opening end Wa. The diaper 1 has a longitudinal direction X and a transverse direction Y. 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 sometimes called the non-skin side. Further, the "skin-facing surface" of the pants-type absorbent article (diaper 1) or its constituent members means the surface relatively close to the wearer's skin. The "non-skin facing surface" of the pants-type absorbent article (diaper 1) or its constituent members means the surface relatively far from the wearer's skin.
Further, in this specification, numerical values such as dimensions and areas of each portion are measured in a natural state in which the elastic member of each portion is not stretched, unless otherwise specified.

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 action of putting on the diaper 1 may be performed not by the wearer of the diaper 1 but by a caregiver.
Further, in this specification, the state in which the diaper 1 is arranged at the wearer's normally assumed wearing position is referred to as "wearing".

As shown in FIGS. 1 and 2, the diaper 1 includes an absorbent body 4 and an outer body 5 arranged on the non-skin facing side of the absorbent 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 limitation.

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 horizontal direction Y of the ventral region 5a and a side edge 5e in the horizontal direction Y of the dorsal region 5b are respectively joined. . The right side joint portion 8 has a structure in which a right side edge portion 5d of the ventral region 5a and a right side edge portion 5e of the dorsal region 5b are overlapped in the thickness direction Z and joined. 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.
By the pair of side joints 8, the abdominal region 5a and the dorsal region 5b form a tubular shape along the waist of the wearer, forming the waist opening 1W and the leg openings 1L of the diaper 1. As shown in FIG.
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]
It is preferable that the side joints 8 keep the abdominal region 5a and the dorsal region 5b in a joined state without peeling off during the putting-on operation and wearing.
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. are separated and the diaper 1 is unfolded and then discarded.
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 during wearing, and can be easily torn at the time of disposal.
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 "peeled off". On the other hand, when discarding the diaper 1, 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.”
Also, the subject who tears the side joints 8 when discarding the diaper 1 is expressed as a "disposer".

In the present embodiment, it is preferable that the pair of side joints 8 are configured substantially line-symmetrically with respect to the longitudinal center line CL, for example, and have the same configuration. The configuration of one side joint portion 8 will be described in detail below.
In addition, in the side joint portion 8, the longitudinal direction X end side means the side approaching the waist end portion 8a or the leg end portion 8b, and the longitudinal direction X central side means the waist end portion 8a or the leg end portion 8b. means the side away from

As shown in FIGS. 2 and 3, the side joints 8 include a waist end region 8c within 25 mm in the longitudinal direction X from the waist end 8a, which is the end on the waist side in the longitudinal direction X, and a waist end region 8c in the longitudinal direction X. It has a leg end region 8d within 25 mm in the longitudinal direction X from the leg end 8b, which is the end on the leg side, and a plurality of seal portions S.
The waist end portion 8a and the leg end portion 8b constitute both end portions of the side joint portion 8 in the longitudinal direction X. As shown in FIG.
The 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 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.
As shown in FIG. 4, when the XZ cross section (the cut surface in the longitudinal direction X) of the side joint portion 8 is enlarged, the sealing portion S is thicker than the surroundings due to the fusion of the fibers 55 of the thermoplastic sheet 50. is observed as a thinned portion.

As shown in FIG. 3, the plurality of seal portions S are spaced apart in the vertical direction X. As shown in FIG.
The planar shape of the seal portion S is not particularly limited, and may be a shape selected from a rectangular shape, other polygonal shapes, a circular shape, an elliptical shape, shapes similar thereto, and other shapes.
As shown in FIG. 3, the planar shape of the seal portions S is preferably a rectangular shape from the viewpoint of securing a sufficient area for each seal portion S while leaving a space therebetween. preferable.
The end portion of each seal portion S on the inner side in the lateral direction Y is referred to as an inner end portion Sc, and the end portion on the outer side in the lateral direction Y is referred to as an outer end portion Sd.

Here, according to the knowledge of the present inventors, at the start of the tearing operation of the side joints 8, the fingers of the disposal person are about 25 mm to 30 mm away from the waist end 8a or the leg end 8b in the longitudinal direction X. It is likely to be arranged on both the left and right sides (abdominal side and dorsal side) of the side joint portion 8 . For example, when the wearer is standing, the disposer's fingers are likely to be placed on the waist side, and when the wearer is lying down, the disposer's fingers are likely to be placed on the leg side.
Therefore, in the side joint portion 8, the region to which the external force for tearing (also referred to as "tearing force") is particularly likely to be applied is the waist end portion within 25 mm in the longitudinal direction X from the waist end portion 8a and the leg end portion 8b. Region 8c and leg end region 8d are defined. From the viewpoint of facilitating tearing during disposal while preventing tearing during wearing and wearing, the arrangement and sealing strength of the seal portion S in the waist end region 8c and/or the leg end region 8d are adjusted. Configure as follows.
As used herein, seal strength refers to peel strength measured by a measuring device such as Tensilon. On the other hand, the joint strength refers to the strength of joint felt by the disposal person when the side joint portion 8 is torn.
Note that FIG. 3 shows an example in which the leg end region 8d is the region where the seal portion S has a characteristic arrangement and seal strength.

As shown in FIG. 3, the plurality of seal portions S includes a plurality of long seal portions S1 that are long in the lateral direction Y and a plurality of short seal portions S2 that are shorter in the lateral direction Y than the long seal portions S1. include.
The side joint portion 8 further includes a plurality of long seal portions S1 aligned along the longitudinal direction X, a long seal row SL1 arranged in the leg end region 8d, and a plurality of short seal portions S2 arranged vertically. It has a long seal row SL1 and a short seal row SL2 arranged side by side in the longitudinal direction X, spaced apart along the X direction.
In the present embodiment, at least a part of the long seal row SL1 may be arranged in the leg end region 8d, and may extend from the leg end region 8d toward the longitudinal direction X central side. Although FIG. 3 shows an example of four long seal portions S1 belonging to the long seal line SL1, the number may be five or more.
“A plurality of seal portions S are aligned in the longitudinal direction X with a space therebetween” means that a plurality of seal portions S spaced apart in the longitudinal direction X are aligned on a straight line extending in the longitudinal direction X. means that Specifically, it is preferable that the deviation of the straight line that bisects each seal portion S in the horizontal direction Y is within 50% of the maximum dimension of the seal portion S in the horizontal direction Y within one seal row.
Since the plurality of seal portions S are aligned in the longitudinal direction X with a space therebetween, if one of the seal portions S is peeled off during wearing and wearing operation, the side joint portion 8 may be separated along the longitudinal direction X. It can prevent the whole from peeling off.

On the other hand, at the start of the tearing action, a tearing force F having both longitudinal direction X central side and lateral direction Y outer components is applied from the inside of the waist end region 8c and/or the leg end region 8d. As shown in FIG. 3, this tearing force F is an oblique outward force that is inclined by about 45° with respect to the longitudinal direction X and the lateral direction Y. As shown in FIG. Therefore, in the side joint portion 8, from the inner end Sc of the long seal portion S1 on the end side in the vertical direction X, the long seal portion S1 are torn apart in turn.

In the side joint portion 8, tearing of the long seal portion S1 adjacent to the longitudinal direction X central side often starts during the tearing of the long seal portion S1 on the longitudinal direction X end side. In this case, two adjacent long seal portions S1 are torn almost simultaneously.
From the viewpoint of preventing peeling during wearing and wearing operation, it is necessary to sufficiently increase the seal strength of the long seal portion S1. , less likely to tear.
In addition, when two seal portions S located close to each other are torn almost simultaneously, an excessive load may be locally applied to the exterior body 5 . As a result, at the side joint portion 8, the exterior body 5 is broken at a portion adjacent to the seal portion S, and the breakage of the exterior body 5 progresses in the lateral direction Y outward along the longitudinal direction of the seal portion S, a so-called lateral joint. Cracking may occur. If the exterior body 5 is torn laterally, the tearing action is interrupted each time, which causes great stress to the disposal person and the wearer.

On the other hand, the long seal portion S1 is composed of an inner seal region S11 located inside the lateral direction Y that bisects the long seal portion S1 in the lateral direction Y, and a lateral seal region S11 that bisects the long seal portion S1 in the lateral direction Y. and an outer seal region S12 located outside in the direction Y and having a higher seal strength than the inner seal region S11. The inner seal region S11 and the outer seal region S12 are formed adjacent to each other in the lateral direction Y and form one long seal portion S1 continuous in the lateral direction Y. As shown in FIG.
That is, in the long seal portion S1, the seal strength in the inner side in the lateral direction Y to which the tearing force F is first applied is lower than the seal strength in the outer side in the lateral direction Y. As a result, the long seal row SL1 can be torn with a weak force at first, and is then torn with a gradual application of force. Therefore, when the tearing starts, the disposal person can easily feel the tearing of the long seal row SL1, and it is difficult to apply an unnecessarily strong force to the side joint portion 8.例文帳に追加Moreover, even when the two long seal portions S1 are torn at the same time, the seal strength of the inner side in the lateral direction Y of the long seal portion S1 where tearing starts later becomes low. Therefore, compared to the case where the long seal portion S1 does not include the inner seal region S11, the total seal strength of the two long seal portions S1 can be kept low. Therefore, even in the middle of tearing, the tearing force F by the disposal person is less likely to increase, and the load on the exterior body 5 is reduced.
As a result, tearing can be easily felt, and lateral tearing of the exterior body 5 can be prevented.
In addition, since the seal strength of the outer seal region S12 on the outer side in the lateral direction Y can be set high, it is possible to prevent peeling during wear and operation.

After the leg end region 8d is torn, a tearing force in the longitudinal direction X is applied to tear the entire side joint portion 8. FIG.
Therefore, in the above configuration, the side joint portion 8 has the short seal line SL2 arranged adjacent to the long seal line SL1 in the longitudinal direction X. As shown in FIG. Since the short seal portion S2 forming the short seal line SL2 has a short length in the horizontal direction Y, it does not require much force including a component in the horizontal direction Y, and can be torn along the vertical direction X more easily.
Therefore, in the side joint portion 8 of the present embodiment, it is possible to achieve both the prevention of peeling during wearing and the wearing operation and the easiness of tearing during disposal.

<Method for measuring seal strength>
A method for measuring and comparing the seal strength between the inner seal region S11 and the outer seal region S12 will be described.
First, the leg end region 8d and/or the waist end region 8c including the long seal line SL1 is cut into a rectangular shape having a length of 10 mm in the longitudinal direction X and a length including the full width of the side joint portion 8 in the lateral direction Y. This rectangular piece is cut at the central portion in the lateral direction Y to obtain two types of measurement samples, laterally Y outer side and inner side. In addition, let the cutting|disconnection position be a position which halves the long seal part S1 in the horizontal direction Y. FIG. The plurality of cut out measurement samples are assumed to have the same laminated number of thermoplastic sheets 50 .
Subsequently, the horizontal Y end portion of each measurement sample is fixed to a Tensilon Universal Tester (RTC-1210A) manufactured by Orientec Co., Ltd., and one outer package 5 is separated from the other outer package 5 . If it is difficult to fix the end of each measurement sample to the Tensilon, tape or the like is attached to the end to secure a length that allows the Tensilon to be fixed. The sample for measurement is peeled off in the lateral direction Y at a speed of 10 mm/min, and the peel strength is measured over time. Then, the measured maximum peel strength is taken as the seal strength of the measurement sample. When it is determined that the seal strength of the measurement sample outside the lateral direction Y is higher than that of the inner side in the lateral direction Y, the long seal portion S1 is divided into the inner seal region S11 located on the inner side in the lateral direction Y and the inner seal region S11 located on the outer side in the lateral direction Y. and an outer seal region S12 having a higher seal strength than the region S11.

A specific example of the seal strength of the seal portion S will be given.
The seal strength of the inner seal region S11 is preferably 0.1 N or more, more preferably 0.12 N or more, and preferably 2 N or less, more preferably 1.8 N or less, from the viewpoint of facilitating tearing at the time of disposal. be.
The seal strength of the seal portion S of the outer seal region S12 is preferably 0.5 N or more, more preferably 0.7 N or more, and preferably 5 N or less, from the viewpoint of preventing peeling during wearing and wearing operation. It is preferably 4N or less.
The ratio of the seal strength of the inner seal region S11 to the seal strength of the outer seal region S12 is preferably 10% or more, more preferably 15% or more, and preferably 80%, from the viewpoint of achieving both peeling prevention and tearability. % or less, more preferably 70% or less.

[Example of method for adjusting seal strength]
The seal strength of the seal portion S can be adjusted, for example, by changing conditions such as temperature, pressure and/or time during the sealing process for forming the seal portion S.
The seal strength can also be adjusted by changing the area of the seal portion S, which is the fused portion of the fibers.
The seal strength can also be adjusted by changing the fiber composition of the thermoplastic sheet 50 .
Specific examples will be described below.

(Example of adjustment by melting degree of fibers)
The seal portion S is a portion formed by fusing fibers of a plurality of thermoplastic sheets 50 of the exterior body 5 . For this reason, a portion where the fibers are sufficiently melted tends to adhere to each other after cooling, resulting in a higher sealing strength.
Therefore, the degree of melting of the fibers in the outer seal region S12 is preferably higher than the degree of melting of the fibers in the inner seal region S11.

<Method for Calculating the Degree of Melting in Each Seal Area>
First, the side joint portion 8 is cut to obtain two types of YZ cross sections (cross sections crossing the long seal portion S1 in the lateral direction Y) of the outer seal region S12 and the inner seal region S11 of the long seal portion S1. Prepare a sample for measurement. The plurality of cut out measurement samples are assumed to have the same laminated number of thermoplastic sheets 50 . After fixing the measurement sample by a known method, the YZ cross section of the measurement sample is imaged with a scanning electron microscope (SEM) at a magnification of 500 times. In each captured image, an outer edge composed of fibers is detected using image analysis software, and the length of the detected line is calculated as the perimeter of each seal area. For each of the outer seal region S12 and the inner seal region S11, the average value of the perimeter of each of the outer seal region S12 and the inner seal region S11 calculated from five or more images is calculated. It is the circumference of the inner seal area S11.
The circumferential lengths of the outer seal region S12 and the inner seal region S11 are compared, and it is determined that the longer the circumferential length, the lower the degree of melting.

FIG. 5A shows an example of an enlarged view of the YZ cross section of the inner seal region S11, and FIG. 5B shows an example of an enlarged view of the YZ cross section of the outer seal region S12.
The inner seal area S11 in FIG. 5A includes many irregularities on the outer edge 55a and has a long circumference. That is, the fibers are not melted so much, and the original unevenness of the fibers remains on the outer edge 55a, which is the surface.
On the other hand, the outer seal region S12 in FIG. 5B has a relatively smooth outer edge 55a and a shorter peripheral length than the inner seal region S11 in FIG. 5A. That is, the fibers are sufficiently melted, and the unevenness of the outer edge 55a is smoothed.
In this case, it is determined that the degree of melting of the fibers in the inner seal region S11 in FIG. 5A is lower than the degree of melting of the fibers in the outer seal region S12 in FIG. 5B.

The degree of melting of the fibers can be adjusted by conditions such as heat, pressure and/or time during the sealing process. By adjusting the sealing strength according to the degree of fusion of the fibers, it is possible to adjust the sealing strength without significantly changing the planar shape (for example, the dimension in the longitudinal direction X) and the thickness of the outer sealing region S12 and the inner sealing region S11. can. By aligning the planar shapes of the outer seal region S12 and the inner seal region S11, the long seal portions S1 can be torn one after another at substantially regular intervals when tearing. Therefore, the tearing operation can be stably and smoothly performed, and the stress of the disposal person can be reduced.
Further, the melting degree of the fibers can be changed without changing the composition of the fibers of the thermoplastic sheet 50 for each of the outer seal region S12 and the inner seal region S11. Thereby, the seal strength can be adjusted relatively easily and accurately.

The ratio of the circumference of the inner seal region S11 to the circumference of the outer seal region S12 is preferably 105% or more, more preferably 110% or more, and preferably 300% or less, more preferably 200% or less.

(Example of adjustment by thickness of seal part)
Further, by greatly compressing the superimposed thermoplastic sheets 50 in the thickness direction Z during the sealing process, the melted fibers are strongly crimped, and the sealing strength of the sealing portion S can be increased. That is, the thinner the seal portion S, the higher the seal strength.
Therefore, the thickness of the outer seal region S12 may be configured to be thinner than the thickness of the inner seal region S11.
The ratio of the average thickness of the inner seal region S11 to the average thickness of the outer seal region S12 is preferably 102% or more, more preferably 104% or more, and preferably 200% or less, more preferably 180% or less.

<Method for measuring the average thickness of each seal area>
First, the side joint portion 8 is cut to prepare a measurement sample including YZ cross sections of each of the outer seal region S12 and the inner seal region S11 of the long seal portion S1 (cross sections crossing each region in the longitudinal direction X). do. The plurality of cut out measurement samples are assumed to have the same laminated number of thermoplastic sheets 50 . After fixing the measurement sample by a known method, the YZ cross section of the measurement sample is imaged by SEM or the like at a magnification of 500 times. Then, in each captured image, using image analysis software, the thickness of three measurement points located on the boundary when the image is divided into four equal parts in the horizontal direction Y is measured, and their average value in the image is It is calculated as the thickness of the seal area. For each of the outer seal region S12 and the inner seal region S11, the average value of the thicknesses calculated from five or more images is calculated, and the average value is used as the average thickness of each of the outer seal region S12 and the inner seal region S11.

[Example of seal strength between outer seal area and short seal part]
As described above, the short seal portion S2 is required to be easily torn in the longitudinal direction X from the middle of tearing. On the other hand, the outer seal region S12 is required to be able to sufficiently suppress peeling during wearing and wearing operation.
From this point of view, the seal strength of the outer seal region S12 is preferably higher than the seal strength of the short seal portion S2.

These seal strength measurement methods can be performed based on the procedure described in the section "Method for measuring seal strength".
The seal strength of the outer seal region S12 can be measured with a measurement sample outside the long seal portion S1 in the lateral direction Y described above. A sample for measurement of the short seal portion S2 was obtained by cutting the side joint portion 8 including the short seal line SL2 into a rectangular shape having a length of 10 mm in the longitudinal direction X and a length including the full width of the side joint portion 8 in the lateral direction Y. do. The plurality of cut out measurement samples are assumed to have the same laminated number of thermoplastic sheets 50 .
Then, as described in "Method for Measuring Seal Strength", the peel strength is measured using Tensilon, and the maximum peel strength is taken as the seal strength of the measurement sample. When it is determined that the seal strength of the measurement sample of the outer seal region S12 is higher than the seal strength of the measurement sample including the short seal row SL2, the seal strength of the outer seal region S12 is equal to the seal strength of the short seal portion S2. determined to be higher than

Specific examples of seal strength are given.
The seal strength of the short seal portion S2 is preferably 0.1 N or more, more preferably 0.12 N or more, and preferably 2 N or less, more preferably 1.8 N or less, from the viewpoint of facilitating tearing at the time of disposal. be.
The ratio of the seal strength of the short seal portion S2 to the seal strength of the outer seal region S12 is preferably 10% or more, more preferably 15% or more, and preferably 80%, from the viewpoint of achieving both peeling prevention and tearability. % or less, more preferably 70% or less.

In order to realize the above configuration, the degree of melting of the fibers in the outer seal region S12 is preferably higher than the degree of melting of the fibers in the short seal portion S2. Thereby, the sealing strength can be adjusted regardless of the planar shape and thickness.
The degree of melting of the fibers can be calculated based on the procedure described in the section "Method for Calculating the Degree of Melting of Each Seal Region". The measurement sample of the short seal portion S2 includes the YZ cross section of the short seal portion S2 (the cross section across the seal portion S in the horizontal direction Y).
From these measurement samples, the perimeter of the fiber in each portion is calculated using an SEM, as described in the "Method for Calculating Degree of Melting in Each Seal Region".
The ratio of the circumference of the short seal portion S2 to the circumference of the outer seal region S12 is preferably 105% or more, more preferably 110% or more, and preferably 300% or less, more preferably 200% or less.

For example, the average thickness of the outer seal region S12 may be thinner than the average thickness of the short seal portion S2.
These average thickness measurements can be performed based on the procedure described in the section "Method for Measuring Average Thickness of Each Seal Area". The measurement sample of the short seal portion S2 includes the YZ cross section of the short seal portion S2 (the cross section across the seal portion S in the horizontal direction Y).
From these measurement samples, the thickness of each portion is calculated using an SEM, as described in "Method for Calculating Average Thickness of Sealed Portion".
The ratio of the average thickness of the short seal portion S2 to the average thickness of the seal portion S of the outer seal region S12 is preferably 102% or more, more preferably 104% or more, preferably 200% or less, more preferably 180%. It is below.

[Example of seal arrangement]
(Inner end arrangement example)
At the time of starting tearing at the time of disposal, force is often applied by pinching the inner side of the waist end region 8c or the leg end region 8d in the lateral direction Y with fingers. On the other hand, when tearing in the longitudinal direction X thereafter, the finger is often moved to the vicinity of the torn location to tear. This movement of the finger is preferably along the vertical direction X so as to minimize wasteful (horizontal direction Y) movement.
From this point of view, the positions of the inner ends Sc on the inner side in the lateral direction Y of the plurality of long seal portions S1 are the positions of the inner ends Sc on the inner side in the lateral direction Y of the plurality of short seal portions S2. It is preferable that they are aligned.
As a result, since the tear starting points of the long seal portion S1 and the short seal portion S2 are aligned in the horizontal direction Y, it is not necessary to move the finger in the horizontal direction Y, and the finger can be moved in the vertical direction X. Therefore, it is possible to provide the side joint portion 8 having a structure that is easier to tear as a whole.
In addition, "the positions of the inner ends Sc of the plurality of seal portions S are aligned in the lateral direction Y" means that the variation in the positions of the inner ends Sc in the lateral direction Y is within 2 mm. .

(Configuration example of the lateral outer side of the short seal row)
From the viewpoint of facilitating tearing of the side joint portion 8 along the longitudinal direction X, it is preferable that the seal portion S is not arranged outside the short seal row SL2 in the lateral direction Y, as shown in FIG.
As a result, when the short seal row SL2 is torn, it can be torn with a force along the longitudinal direction X with a small transverse direction Y component. Thereby, it is possible to provide the side joint portion 8 having a structure that is easier to tear as a whole.

(Example of arrangement of long seal part)
At the start of tearing, as shown in the enlarged view of FIG. 6, an oblique force F including a component directed toward the center in the vertical direction X and a component directed toward the outer side in the horizontal direction Y is applied. Since the tear in the waist end region 8c or the leg end region 8d proceeds along the direction of this force F, the peel interface moves along a direction perpendicular thereto. That is, the separation interface is formed on the line L along the direction including the component toward the center in the vertical direction X and the component toward the inner side in the horizontal direction Y. The line L is inclined at approximately 45° with respect to the vertical direction X and the horizontal direction Y. As shown in FIG.
Here, when two outer seal regions S12 overlap on the line L, the two outer seal regions S12 are torn at the same time. This increases the force required to tear the waist end region 8c or the leg end region 8d.
From the viewpoint of suppressing this, in the long seal row SL1, a plurality of long seal portions S1 are arranged at intervals of the first dimension D1 in the longitudinal direction X, and the first dimension D1 is the width of the long seal portion S1. It is preferably larger than the second dimension D2 which is half the dimension in the Y direction.
By arranging the long seal part S1 in this way, when tearing the outer seal area S12 of the long seal part S1 on the side of the longitudinal direction X end, the inner seal area S11 of the long seal part S1 torn at the same time is torn. It will be. Therefore, it is possible to suppress an increase in the force required for tearing and to provide the side joint portion 8 that is easily torn.

[Example of dimensions related to the seal part]
The following examples are given as the dimensions and the like of the seal portion S from the viewpoint of achieving both the prevention of peeling during the wearing operation and the wear and the easiness of tearing. In addition, the following dimensions shall be measured in the natural state which is not extending|stretching an elastic member.
The dimension (maximum dimension) in the lateral direction Y of the long seal portion S1 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.
The dimension (maximum dimension) in the lateral direction Y of the short seal portion S2 is preferably 0.3 mm or more, more preferably 0.5 mm or more, and is preferably 8 mm or less, more preferably 3 mm or less.
The dimension (maximum dimension) in the longitudinal direction X of the long seal portion S1 and the short seal portion S2 is preferably 0.1 mm or more, more preferably 0.3 mm or more, and is preferably 2 mm or less, more preferably 0.6 mm. It is below.
The pitch of the long seal portions S1 in the longitudinal direction X is preferably 1.5 mm or more, more preferably 2 mm or more, and preferably 5.0 mm or less, more preferably 4 mm or less.
The pitch of the short seal portions S2 in the longitudinal direction X is preferably 1.5 mm or more, more preferably 2 mm or more, and is preferably 5.0 mm or less, more preferably 4 mm or less.
The pitch in the longitudinal direction X of the plurality of seal portions S means the distance in the longitudinal direction X between the lines dividing each seal portion S into two equal parts in the longitudinal direction X in the seal portions S adjacent to each other in the longitudinal direction X. If the pitch is not constant, the pitches in the vertical direction X are measured at five locations, and the average value is taken as the pitch in the vertical direction X.
From the longitudinal direction X end of the side joint portion 8 on the side where the long seal row SL1 is arranged to the longitudinal direction X center side end of the long seal portion S1 closest to the longitudinal direction X central side of the long seal row SL1 is preferably 10 mm or more, more preferably 20 mm or more, and preferably 70 mm or less, more preferably 60 mm or less.
From the longitudinal direction X end portion of the side joint portion 8 on the side where the short seal row SL2 is arranged to the longitudinal direction X center side end portion of the short seal portion S2 closest to the longitudinal direction X central side of the short seal row SL2 is preferably 50 mm or more, more preferably 60 mm or more, and preferably 130 mm or less, more preferably 120 mm or less.

[Arrangement example of fusion inhibitor]
The local peel strength of the seal portion S can also be adjusted by disposing a melting inhibitor that inhibits melting of the resin between the thermoplastic sheets 50 . For example, by arranging a linear melt inhibitor so as to intersect the seal portion S, it is possible to locally provide the seal portion S with a portion that is easily torn.

From such a point of view, as shown in FIG. 7, at least one of the waist end region 8c and the leg end region 8d in which the long seal rows SL1 are arranged is a linear fusion zone between the thermoplastic sheets 50. It is preferred to have an adhesion inhibitor 9 . In this case, the plurality of long seal portions S1 excluding at least the long seal portion S1 closest to the longitudinal direction X end constitute cross seal portions St1 and St2 each having a cross portion 9s crossing the fusion inhibitor 9. preferably.
Since the long seal portion S1 closest to the X-end in the vertical direction does not overlap the fusion inhibitor 9, it becomes difficult for peeling starting points to form at the X-end in the vertical direction during wearing and operation. On the other hand, since the plurality of long seal portions S1 on the center side in the longitudinal direction X intersect with the linear fusion inhibitor 9, the intersecting portions 9s serve as starting points for tearing when the diaper 1 is discarded, making the side joints easier to tear. 8 can be obtained.

The fusion inhibitor 9 is placed between the thermoplastic sheets 50 of the exterior body 5 before the sealing process for forming the seal portion S, for example.
As the fusion inhibitor 9, any substance capable of suppressing the influence of heat applied during the sealing process can be used without particular limitation. Examples of such substances include hot-melt adhesives, polyurethane base materials, petroleum-based resins, and the like.
The fusion inhibitor 9 is preferably a hot-melt adhesive from the viewpoint of joining the sheets together, in addition to reducing the heat generated in the sealing process. As the hot-melt adhesive, for example, styrene-based (SIS, SBS, SEBS) or polyolefin-based materials can be used.
As a method for disposing the fusion inhibitor 9, a commonly used method can be used without particular limitation, but a method of applying the fusion inhibitor 9 using a coater gun is preferable. Thereby, the coating shape, basis weight, etc. of the fusion inhibitor 9 can be easily controlled.

The fusion inhibitor 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 inhibitor 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. good too.
“The fusion inhibitor 9 extends linearly” means that the fusion inhibitor 9 extends linearly and/or curvedly in plan view. The fusion inhibitor 9 traverses the cross seal portions St1 and St2 in the longitudinal direction X, so it extends in a direction including the longitudinal direction X component.

The cross seal portions St1 and St2 mean the long seal portions S1 that intersect the fusion inhibitor 9 in plan view among the plurality of long seal portions S1. In the above configuration, the long seal portions S1 closest to the waist end portion 8a and/or the leg end portions 8b do not intersect the fusion inhibitor 9 and do not form cross seal portions St1 and St2. In the example shown in FIG. 7, the third long seal portion S1 from the leg end portion 8b side constitutes the first cross seal portion St1, and the fourth long seal portion S1 constitutes the second cross seal portion St2. Configure.
The intersection portion 9s means a portion of the intersection seal portions St1 and St2 that intersects the fusion inhibitor 9 in plan view. In the cross seal portions St1 and St2, the ends on the side of the waist end 8a and extending in the lateral direction Y are the upper ends Sa, and the ends on the side of the leg ends 8b and extending in the lateral direction Y are the lower ends. Sb, the intersection 9s is linearly formed from the lower end Sb to the upper end Sa.
It is preferable that there is one intersection portion 9s in each of the intersection seal portions St1 and St2. Furthermore, in the side joint portion 8, it is more preferable that one fusion inhibitor 9 intersects the plurality of cross seal portions St1 and St2 at one location.

(Example of placement of fusion inhibitor in plan view)
Furthermore, from the viewpoint of reducing the local peel strength by the fusion inhibitor 9 and inducing tearing, the side joints 8 can adopt the following configuration.
The cross seal portion positioned closest to the longitudinal direction X end constitutes a first cross seal portion St1. A cross seal portion adjacent to the first cross seal portion St1 constitutes a second cross seal portion St2. The first cross-sealed portion St1 and the second cross-sealed portion St2 preferably cross the fusion inhibitor 9 at positions other than the outer end Sd and the inner end Sc on both sides in the horizontal direction Y. Moreover, the first cross seal portion St1 and the second cross seal portion St2 are preferably arranged in at least one of the waist end region 8c and the leg end region 8d where the long seal line SL1 is arranged.
Furthermore, from the viewpoint of improving tearability at the time of disposal, the side joint portion 8 including the first cross seal portion St1 and the second cross seal portion St2 satisfies the following formula (1).
5 degrees < α1 ≤ α2 < α3 ≤ α4 < 90 degrees (1)
In the above formula (1), the crossing angle between the fusion inhibitor 9 and the first cross seal portion St1 on the side of the longitudinal direction X end portion and the lateral direction Y inner side is α1. In the example shown in FIG. 7, the crossing angle α1 is the crossing angle between the fusion inhibitor 9 and the lower end portion Sb of the first cross seal portion St1 in the horizontal direction Y. In the example shown in FIG.
The intersection angle between the fusion inhibitor 9 and the first cross seal portion St1 on the center side in the vertical direction X and the outer side in the horizontal direction Y is α2. In the example shown in FIG. 7, the crossing angle α2 is the outside crossing angle in the horizontal direction Y between the fusion inhibitor 9 and the upper end portion Sa of the first cross seal portion St1.
The crossing angle between the fusion inhibitor 9 and the second cross seal portion St2 on the longitudinal direction X end portion side and laterally Y inner side is α3. In the example shown in FIG. 7, the crossing angle α3 is the crossing angle between the fusion inhibitor 9 and the lower end portion Sb of the second cross seal portion St2 in the lateral direction Y. In the example shown in FIG.
The intersection angle between the fusion inhibitor 9 and the second cross seal portion St2 on the center side in the vertical direction X and the outer side in the horizontal direction Y is α4. In the example shown in FIG. 7, the crossing angle α4 is the outside crossing angle in the horizontal direction Y between the fusion inhibitor 9 and the upper end portion Sa of the second cross seal portion St2.
The intersection angle between the fusion inhibitor 9 and each of the cross seal portions St1 and St2 is defined by the side edge portion of the fusion inhibitor 9 in the horizontal direction Y and the upper end portion Sa or the lower end portion Sb of each of the cross seal portions St1 and St2. means the angle between When the fusion inhibitor 9 has a curved shape, the crossing angle is the tangent line of the side edge of the fusion inhibitor 9 in the lateral direction Y and the upper end Sa or the lower end Sb at the intersection of the side edge and the upper end. The angle between the portion Sa or the lower end portion Sb.

Since the side joint portion 8 satisfies the above formula (1), the angle between the second cross seal portion St2 and the fusion inhibitor 9 is greater than the crossing angles α1 and α2 between the first cross seal portion St1 and the fusion inhibitor 9. crossing angles α3 and α4 of are larger. In other words, the extending direction of the fusion inhibitor 9 is inclined with respect to the longitudinal direction X at the longitudinal direction X end of the first cross seal St1, but the longitudinal direction of the second cross seal St2 is inclined. The extending direction of the fusion inhibitor 9 changes to a direction nearly parallel to the longitudinal direction X toward the X center side. As a result, tearing in the horizontal direction Y is likely to be induced on the end portion side in the vertical direction X of the first cross seal portion St1, and the direction closer to the vertical direction X moves toward the center side in the vertical direction X of the second cross seal portion St2. tearing is easily induced. In addition, the longitudinal direction X end side of each cross seal portion St1, St2 can be a portion to which the tearing force is first applied in each cross seal portion St1, St2. For this reason, by changing the crossing angles α1 and α3 on the side of the longitudinal direction X end portion, it becomes easier for the disposal person to feel the change in the tearing direction. Therefore, the fusion inhibitor 9 can induce tearing in the preferred direction from the lateral direction Y to the longitudinal direction X, and the disposal person 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 inhibitor 9 is suppressed to a range in which the ease of tearing can be ensured, and the fusion inhibitor 9 is removed from the first cross seal portion St1 and It can be reliably crossed with the second cross seal portion St2.
Furthermore, the fusion inhibitor 9 does not overlap the inner end Sc and the outer end Sd of the first cross seal St1 and the second cross seal St2. As a result, when the fingers of the waste person pulling up the pants-type absorbent article come into contact with the outer ends Sd of the first and/or second cross-sealed portions St1 and/or St2 in the wearing operation, the outer ends Sd are removed from the outer ends Sd. It is possible to prevent the seal portion S from peeling 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 St1 and the second cross seal portion St2, the inner ends Sc It is possible to prevent the seal portion S from being peeled off.
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 St1 and the second cross seal portion St2 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 inhibitor is applied from the longitudinal direction X end portion side of the first cross seal portion St1 toward the longitudinal direction X central side of the second cross seal portion St2. The crossing angles α1, α2, α3 and α4 of 9 gradually increase. Thus, tearing in the vertical direction X can be induced more smoothly from the longitudinal direction X end side of the first cross seal portion St1 toward the longitudinal direction X central side of the second cross seal portion St2. Therefore, the fusion inhibitor 9 can more effectively induce tearing in the preferred direction from the lateral direction Y to the longitudinal direction X, and the tearability of the side joints 8 can be improved.

In addition, from the viewpoint of improving tearability in the longitudinal direction X, the plurality of long seal portions S1 includes three or more n cross seal portions St1, including the first cross seal portion St1 and the second cross seal portion St2. It is preferable to have St2, . . . , Stn.
In the example shown in FIG. 8, the plurality of long seal portions S1 includes a first cross seal portion St1, a second cross seal portion St2 and a third cross seal portion St3.
In the following description, each of the cross seal portions St1, St2, . . . , Stn is also referred to as cross seal portion Stk.
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 St1, St2, .
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. 8, when n=3, the following formula (3)'' holds from formulas (2) and (3).
5 degrees<α1≦α2<α3≦α4<α5≦α6≦90 degrees (3)''

In the above formulas (2) and (3), the k-th cross seal portion Stk on the longitudinal direction X center side from the first cross seal portion St1 and the fusion inhibitor 9, on the longitudinal direction X end side and laterally Let α(2k−1) be the crossing angle inside the direction Y. In the example shown in FIG. 8, the intersection angle α(2k−1) is the intersection angle between the fusion inhibitor 9 and the lower end portion Sb of the k-th cross seal portion Stk in the lateral direction Y. In the example shown in FIG.
Let α(2k) be the intersection angle between the k-th cross seal portion Stk and the fusion inhibitor 9 on the center side in the longitudinal direction X and the outer side in the lateral direction Y. In the example shown in FIG. 8, the crossing angle α(2k) is the outside crossing angle in the horizontal direction Y between the fusion inhibitor 9 and the upper end portion Sa of the k-th cross seal portion Stk.
That is, the expression (2) can be expressed by the intersection angle α(2(k−1)−1) and the intersection angle α(2(k−1)) of the (k−1)-th cross seal portion St(k−1). The crossing angle α(2k−1) and the crossing angle α(2k) of the next k-th crossing seal portion Stk are larger than that.
In the formula (3), the intersection angle α1 of the first cross seal portion St1 closest to the end in the vertical direction X is greater than 5 degrees, and the intersection angle α(2n) of the cross seal portion Stn closest to the center in the vertical direction X is It represents that it is 90 degrees or less.

Since the side joint portion 8 satisfies Expression (2), the crossing angle of the fusion inhibitor 9 gradually increases from the first cross seal portion St1 toward the cross seal portion Stn on the central side in the longitudinal direction X. That is, in the first cross seal portion St1, the extending direction of the fusion inhibitor 9 is a direction inclined with respect to the longitudinal direction X, but as it goes toward the cross seal portion Stk on the center side in the longitudinal direction X, the fusion is increased. The extending direction of the inhibitor 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 St1, and tearing in a direction closer to the longitudinal direction X is more likely to be induced toward the center side cross seal portion Stk in the longitudinal direction X. Therefore, the fusion inhibitor 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 fusion inhibitor 9 can be suppressed within a range in which tearability 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 St1, St2, . 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 longitudinal direction X end portion side of the first cross seal portion St1 toward the longitudinal direction X center side of the n-th cross seal portion Stn , the crossing angle of the fusion inhibitor 9 gradually increases. That is, on the longitudinal direction X end side of the first cross seal portion St1, the extending direction of the fusion inhibitor 9 is a direction inclined with respect to the longitudinal direction X, but The extending direction of the fusion inhibitor 9 gradually changes to a direction nearly parallel to the longitudinal direction X toward the side. 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, the cross seal portion Stk crosses the fusion inhibitor 9 at positions other than the outer end portions Sd and the inner end portions Sc on both sides in the lateral direction Y, and Over a region of 10 mm or more, the intersection distance ak between the inner end portion Sc and the intersection portion 9 s is provided so as to monotonically increase from the longitudinal direction X end side toward the longitudinal direction X central side. preferable.
The "area of 10 mm or more in the vertical direction X" here means an area of 10 mm or more in the vertical direction X from the lower end Sb or upper end Sa of the first cross seal portion St1 on the side of the vertical direction X end. Further, the range in which the intersection distance ak monotonically increases is up to the intersection seal portion Stk in which the lower end portion Sb or the upper end portion Sa on the longitudinal direction X end side is included in the region.
The intersection distance ak is the distance in the horizontal direction Y from the inner end Sc to the innermost point in the horizontal direction Y of the intersection 9s.
Monotonically increasing means that the crossing distance ak is longer than the crossing distance a(k−1).
That is, in the above configuration, when k is an integer of 2 or more, the intersection distance a (k-1) and k The following formula (4) holds for the intersection distance ak of the th intersection seal portion Stk.
a(k−1)<ak (4)

A region within 10 mm in the longitudinal direction X from the first cross seal portion St1 is a region where the disposal person's fingers are particularly likely to be placed when tearing is started, and a particularly strong tearing force F in an oblique direction is likely to be applied. Therefore, in this region, the crossing portion 9s serving as the tear guide portion is arranged gradually outward in the horizontal direction Y from the end portion in the vertical direction X toward the central side in the vertical direction X. As a result, the tearing force F in the oblique direction can efficiently tear off the plurality of cross seal portions Stk.

From the viewpoint of achieving a more stable tearing operation, it is preferable that the crossing portions 9s of the plurality of crossing seal portions St1 and St2 have substantially the same width in the horizontal direction Y, as shown in FIG.
In the example shown in FIG. 7, the width b1 in the horizontal direction Y of the crossing portion 9s between the first cross seal portion St1 and the fusion inhibitor 9 is equal to the width b1 of the cross portion 9s between the second cross seal portion St2 and the fusion inhibitor 9. is substantially the same as the width b2 in the horizontal direction Y of .
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 being 100%. do.
With the above configuration, fluctuations in the widths b1 and b2 of the crossing portion 9s can be suppressed, and fluctuations in the peel strength of the crossing seal portions St1 and St2 can be suppressed. As a result, the person who discards the pants-type absorbent article can be prevented from feeling a sense of incompatibility during tearing. Therefore, it is possible to prevent the problem that the disposal person applies an excessively strong tearing force to tear the outer package 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 seal strength of the crossing seal portions St1 and St2, and the peeling of the side joint portion 8 during the wearing operation and wearing can be more reliably prevented. can be prevented.

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 Stk in the horizontal direction Y. , more preferably 50% or less.
The width of the intersection 9s in the horizontal 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 Stk shall be measured as the dimension in the maximum stretched state.

Moreover, as shown in FIGS. 9A and 9B, the fusion inhibitor 9 is preferably curved. In this case, for example, the fusion inhibitor 9 is preferably composed of at least part of a spiral or wavy curve.
For example, the fusion inhibitor 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, the fusion inhibitor 9 preferably satisfies the above formula (1) and the like by arranging at least part of the spiral or wavy curve in the side joint portion 8 .

The spiral or wavy curve forming the fusion inhibitor 9 has a shape in which a plurality of unit shapes 9a and 9b are repeatedly arranged in one direction.
FIG. 9(A) shows an example in which the curve of fusion inhibitor 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 as one unit shape 9a. In FIG. 9(A), unit shapes 9a that are close to an ellipse are repeatedly arranged in the horizontal direction Y. In FIG. In FIG. 9(A), each unit shape 9a is formed in a closed ring 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. 9B shows an example in which the curve of the fusion inhibitor 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 configuring the fusion inhibitor 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, it is possible to suppress discomfort that may occur during the tearing of the side joint portion 8, and to prevent a problem such as tearing the exterior body 5 by applying an excessively strong tearing force to the disposal person.

Furthermore, the spiral or wavy curve of the fusion inhibitor 9 preferably extends along the transverse 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, the fusion inhibitor 9 having a shape that satisfies the above formula (1) and has a smooth curved shape can be realized.

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. 9A, 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 shown in FIG. 9B, 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 vertical direction X, so that tearing in the vertical direction X can be more easily guided, and the easiness of tearing can be further improved.

(Example of placement of fusion inhibitor in thickness direction)
In order for the fusion inhibitor 9 to efficiently exert its fusion inhibiting action, it is more preferable to arrange it in the vicinity of the interface to be joined.
From this point of view, as shown in FIG. 10, the fusion inhibitor 9 is preferably arranged between the skin-side sheet P of the thermoplastic sheet 50 and the adjacent sheet Q adjacent thereto.
The skin-side sheet P is a thermoplastic sheet 50 that constitutes the skin facing surface of the exterior body 5 in at least one of the waist end region 8c and the leg end region 8d where the long seal rows SL1 are arranged.
The adjacent sheet Q is a thermoplastic sheet 50 adjacent to the skin side sheet P in the thickness direction Z.
At the side joint portion 8, 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 contact each other to be sealed. In the above configuration, since the fusion inhibitor 9 is arranged in the vicinity of the joint interface, the fusion inhibition effect between the ventral region 5a and the dorsal region 5b by the fusion inhibitor 9 is likely to be exerted. Therefore, the peel strength of the crossing portion 9s can be effectively reduced, and the ease of tearing can be further improved.

In the example shown in FIG. 10 , the skin-side sheet P is composed of the inner layer sheet 52 of the exterior body 5 . Also, the adjacent sheet Q is composed of the outer layer sheet 51 of the exterior body 5 . In addition, in the cross-sectional view of FIG. 10, 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. 10, the fusion inhibitor 9 is placed in the ventral region 5a, but it may also be placed in the dorsal region 5b, being placed in both the ventral region 5a and the dorsal region 5b. may

From the viewpoint of further improving tearability, the depth of permeation of the fusion inhibitor 9 in the skin-side sheet P is preferably greater than the depth of permeation of the fusion inhibitor 9 in the adjacent sheet Q.
The permeation depth means the depth of permeation of the fusion inhibitor 9 from the coated surface in the sheet thickness direction.
This makes it easier for the fusion inhibitor 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 inhibitor 9 has a more effective fusion-inhibiting action. can be demonstrated. Therefore, tearability can be improved more effectively.

<Method for measuring penetration depth of fusion inhibitor>
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 inhibitor 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 soaked with the fusion inhibitor 9 is observed as a portion that shines transparently. This measurement is performed at five locations in the waist end region 8c or the leg end region 8d to be measured, and the average value of these measurements is taken as the permeation depth of the fusion inhibitor 9 in that end region.

[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 lateral direction Y. As shown in FIG.
The plurality of elastic members 10 are arranged between the plurality of thermoplastic sheets 50 of the exterior body 5 (see FIG. 10).
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 armor 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. Materials conventionally used for absorbent articles such as disposable diapers can be used as materials for the elastic members 10 and 11 without particular limitation. , elastic polyolefin, polyurethane, and the like.

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 region where force is applied at the time of tearing, which tends to affect the ease of tearing of the side joint portion 8 .
Therefore, from the viewpoint of improving the ease of tearing at the time of disposal and making it easier to follow the waist circumference where the waist circumference tends to change depending on the wearer's posture, the elastic member is formed in a region including and not including the waist end region 8c. It is preferable to adjust the elongation rate as follows.

As shown in FIG. 2, the ventral region 5a and the dorsal region 5b each have a first stretchable region 5f and a second stretchable region 5g in which a plurality of elastic members 10 extending in the lateral direction Y are arranged. The first stretchable region 5f and the second stretchable region 5g each extend in the horizontal direction Y from one of the pair of side joints 8 to the other. That is, the first stretchable region 5f and the second stretchable region 5g extend over the entire width in the horizontal direction Y of the ventral region 5a and the dorsal region 5b.
The first elastic region 5f extends in the lateral direction Y from the waist end region 8c. That is, both lateral Y ends of the first stretchable region 5f are constituted by the waist end regions 8c.
The second stretchable region 5g is adjacent to the first stretchable region 5f in the longitudinal direction X and extends in the lateral direction Y from the region of the side joint 8 excluding the waist end region 8c.

In this configuration, the average stretch rate of the plurality of elastic members 10 in the first stretchable region 5f is preferably lower than the average stretch rate of the plurality of elastic members 10 in the second stretchable region 5g.
The stretch ratio 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 .

The waist end region 8c may be directly subjected to forces in the lateral direction Y during the tearing action, as described above. In the above configuration, since the average elongation rate of the elastic member 10 in the first elastic region 5f is low, 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. Furthermore, a position of 25 mm in the vertical direction X from the waist end 8a (waist opening end Wa) of the ventral region 5a and the dorsal region 5b is cut parallel to the horizontal direction Y, and the first elastic region 5f and the second elastic region are cut. Cut out 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 first 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 second elastic 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 elongation rate of the plurality of elastic members 10 in the first elastic region 5f to the average elongation rate of the plurality of elastic members 10 in the second elastic region 5g is preferably 20 from the viewpoint of effectively obtaining the above effects. % or more, more preferably 30% or more, preferably 90% or less, more preferably 80% or less.

[Configuration example of exterior body]
As shown in FIG. 10 , 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 . For example, an elastic member 10 is arranged between the inner layer sheet 52 and the outer layer sheet 51 .
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. 10, only the outer layer sheet 51 is folded back from the waist end 8a to the skin side.

In the present embodiment, as shown in FIG. 10 , the side joint portion 8 has a plurality of regions in which the thermoplastic sheets 50 are laminated in different numbers due to the folded structure of the exterior body 5 .
That is, in the present embodiment, the side joint portion 8 includes a first laminated portion T1 in which six or more thermoplastic sheets 50 are laminated, and a second laminated portion T1 in which a smaller number of thermoplastic sheets 50 than the first laminated portion T1 are laminated. 2 laminated portion T2. In the present embodiment, the first laminated portion T1 corresponds to a region where the exterior body 5 is folded. A leg end region 8d on the side of the leg end 8b is arranged in the second laminated portion T2. The first laminated portion T1 includes, as the thermoplastic sheet 50, a first skin-side sheet P1 forming a skin-facing surface. The second laminated portion T2 includes, as the thermoplastic sheet 50, a second skin-side sheet P2 that constitutes the skin-facing surface.

In the example shown in FIG. 10, the first laminated portion T1 of the ventral region 5a is composed of three layers: an unfolded outer layer sheet 51, an unfolded inner layer sheet 52, and a folded outer layer sheet 51. be done. The first laminated portion T1 of the dorsal region 5b is also composed of the same three layers. Thus, the first laminated section T1 is composed of a total of six layers. In the first laminated portion T1, the first skin side sheet P1 is composed of the outer layer sheet 51 folded back.
In the example shown in FIG. 10, the second laminated portion 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 portion T2 of the dorsal region 5b is also composed of two similar layers. As a result, the second lamination part T2 is composed of a total of four layers. In the second laminated portion T2, the second skin side sheet P2 is composed of the inner layer sheet 52 that is not folded back.

Since the number of laminated thermoplastic sheets 50 is greater in the first laminated portion T1 than in the second laminated portion T2, the amount of thermoplastic resin is also increased. Therefore, the first laminated portion T1 has a larger amount of heat-sealed resin than the second laminated portion T2, and the sealing strength of the seal portion S tends to be high.
Therefore, by adjusting the arrangement of the seal portions S of the first laminated portion T1 and the second laminated portion T2, the bonding strength between the first laminated portion T1 and the second laminated portion T2 is adjusted, and the tearing stability is improved. be able to.

[Arrangement Example of Seal Portions in First Laminated Part and Second Laminated Part]
As schematically shown in FIG. 11, when the side joint portion 8 has the first laminated portion T1 and the second laminated portion T2, at least part of the short seal row SL2 is arranged in the first laminated portion T1, At least part of the long seal row SL1 is preferably arranged in the second lamination portion T2.
As a result, the ratio of the area of the seal portion S to the first laminated portion T1 having a large amount of heat-sealed resin can be made smaller than the ratio of the area of the sealed portion S to the second laminated portion T2. Therefore, an increase in the bonding strength of the first laminated portion T1 to the second laminated portion T2 can be suppressed, and the tearing stability of the side joint portion 8 can be enhanced.

In addition, the boundary between the long seal line SL1 and the short seal line SL2 is often displaced from the boundary between the first laminated section T1 and the second laminated section T2 due to manufacturing reasons. In this case, as shown in FIG. 11, the short seal row SL2 preferably extends from the first laminated portion T1 to part of the second laminated portion T2. "The short seal line SL2 extends to the second lamination portion T2" means that at least part of the short seal portions S2 constituting the short seal line SL2 are arranged in the second lamination portion T2.
As a result, the bonding strength between the first lamination part T1 and the second lamination part T2 does not suddenly increase, and it is possible to suppress the discomfort of the waste person due to the change in the number of lamination. In addition, since the joint strength is lowered once, the disposal person can rest his/her hands in the middle of tearing, and the burden of tearing on the disposal person can be reduced. Therefore, the ease of tearing of the side joint portion 8 can be enhanced more effectively.

[Configuration example of the skin-side sheet in the first lamination part and the second lamination part]
From the viewpoint of adjusting the bonding strength between the first laminated portion T1 and the second laminated portion T2 and improving the tearing stability, the first skin side sheet P1 and the second skin side sheet P2 having different configurations may be adopted. good.

(Arrangement of embossed portion on skin side sheet)
In the present embodiment, each of the first skin-side sheet P1 and the second skin-side sheet P2 may be composed of a spunbond nonwoven fabric including a plurality of embossments.
The embossments of the spunbond nonwoven fabric are the portions where the fibers are crimped and fused. The embossing is, for example, intermittently formed by thermocompression bonding using an embossing convex roll and a flat roll, etc., formed by ultrasonic fusion, or formed by intermittently applying hot air to partially fuse. etc. From the viewpoint of high productivity and low equipment cost, the embossing is preferably formed by thermocompression bonding.
The planar shape of the embossing may be circular, elliptical, polygonal, or any shape similar thereto. The embossing is preferably formed in a regular pattern, but may be formed in a random pattern.
In the embossing, the fibers are likely to break due to heat treatment and/or processing during formation, so when the embossing overlaps with the embossing of the seal portion S, the seal strength may decrease.

Therefore, the first skin-side sheet P1 and the second skin-side sheet P2 have different embossed area ratios, that is, the ratio of the total area of the regions occupied by the plurality of embossed regions to the total area of the predetermined region. It is preferably composed of a spunbond nonwoven fabric. Specifically, the first skin-side sheet P1 preferably has a higher embossed area ratio than the second skin-side sheet P2.
The embossed area ratio in the spunbond nonwoven fabric is measured in a region containing a sufficiently large number of embossments, and can be measured, for example, in a 20 mm×20 mm square region of the spunbond nonwoven fabric. The area occupied by each embossment can be recognized as a series of areas where thermal fusion of the fibers can be seen. In addition, the measurement of the above-mentioned area ratio shall be performed in the unfolded and stretched state.

As described above, the seal strength may be reduced in the seal portion S that overlaps the embossment. Therefore, by increasing the embossed area ratio in the first laminated portion T1 having a large number of laminated layers, the seal portion S and the embossed portions are more easily overlapped in the first laminated portion T1, and an increase in the seal strength can be suppressed. . As a result, the difference in joint strength between the first laminated portion T1 and the second laminated portion T2 can be reduced, and the joint 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 embossed area ratio 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 embossed area ratio 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 sealing strength tends to decrease. Therefore, by increasing the melting point of the first skin-side sheet P1 in the first laminated portion T1 having a large number of laminated layers, it is possible to suppress an increase in the seal strength of the seal portion S of the first laminated portion T1. As a result, the difference in joint strength between the first laminated portion T1 and the second laminated portion T2 can be reduced, and the joint 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 seal strength of the seal portion S tends to be high. Therefore, in the first laminated portion T1 having a large number of laminated layers, by reducing the basis weight of the first skin-side sheet P1, it is possible to suppress an increase in the seal strength of the seal portion S of the first laminated portion T1. . As a result, the difference in joint strength between the first laminated portion T1 and the second laminated portion T2 can be reduced, and the joint 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>
Next, another embodiment will be described. In addition, in each of the following embodiments, the same reference numerals are given to the same or corresponding configurations as those of the above-described first embodiment, and the description thereof will be omitted as appropriate. In addition, the configuration described in the first embodiment can be applied to the pants-type absorbent article (underpants-type disposable diaper) of each embodiment to the extent possible.

In the first embodiment, the structure in which only the outer layer sheet 51 is folded has been described as the folding structure of the exterior body 5, but the present invention is not limited to this.
In this embodiment, as shown in FIG. 12, both the outer layer sheet 51 and the inner layer sheet 52 may be folded.

In the example shown in FIG. 12, 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 underpants-type absorbent article of the present embodiment, the side joints 8 also have the long seal line SL1 and the short seal line SL2 located in at least one of the waist end region 8c and the leg end region 8d. , Each long seal portion S1 includes an inner seal area S11 located inside in the lateral direction Y and an outer seal area S12 located outside in the lateral direction Y and having a higher seal strength than the inner seal area S11. As a result, it is possible to achieve both prevention of peeling during wearing and wearing, and ease of tearing during disposal.

In at least one of the waist end region 8c and the leg end region 8d where the long seal row SL1 is arranged, 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 .
In this case, as in the first embodiment, the fusion inhibitor 9 is applied to the skin-side sheet P and the adjacent sheet in at least one of the waist end region 8c and the leg end region 8d where the long seal rows SL1 are arranged. Q. In the example shown in FIG. 12, the fusion inhibitor 9 is placed in the dorsal region 5b, but as described above, it may also be placed in the ventral region 5a. It may be arranged on both sides.

Further, as in the first embodiment, the side joint portion 8 includes a first laminated portion T1 in which six or more thermoplastic sheets 50 including the first skin side sheet P1 are laminated, and a second skin side sheet P2. and a second laminated portion T2 in which thermoplastic sheets 50 are laminated in a number smaller than that of the first laminated portion T1. Also in the present embodiment, the first laminated portion T1 corresponds to a region where the exterior body 5 is folded back.

In the example shown in FIG. 12, the first laminated portion T1 of the ventral region 5a includes an outer layer sheet 51 that is not folded, an inner layer sheet 52 that is not folded, an inner layer sheet 52 that is folded, and an outer layer sheet that is folded. 51 and 4 layers. The first laminated portion T1 of the dorsal region 5b is also composed of the same four layers. Thus, the first laminated section T1 is composed of a total of eight layers. In the first laminated portion T1, the first skin side sheet P1 is composed of the outer layer sheet 51 folded back.
In the example shown in FIG. 12, the second laminated portion 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 portion T2 of the dorsal region 5b is also composed of two similar layers. As a result, the second lamination part T2 is composed of a total of four layers. In the second laminated portion T2, the second skin side sheet P2 is composed of the inner layer sheet 52 that is not folded back.

Also in this configuration, as in the first embodiment, at least part of the short seal line SL2 is arranged in the first lamination section T1, and at least part of the long seal line SL1 is arranged in the second lamination section T2. preferably. In addition, the first skin-side sheet P1 and the second skin-side sheet P2 may be configured as described in the section "Configuration Example of the Skin-Side Sheets in the First Laminated Part and the Second Laminated Part" of the first embodiment. can. As a result, the joint strength of the entire side joint portion 8 can be further stabilized.

<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. 13 , 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 underpants-type absorbent article of the present embodiment, the side joints 8 also have the long seal line SL1 and the short seal line SL2 located in at least one of the waist end region 8c and the leg end region 8d. , Each long seal portion S1 includes an inner seal area S11 located inside in the lateral direction Y and an outer seal area S12 located outside in the lateral direction Y and having a higher seal strength than the inner seal area S11. As a result, it is possible to achieve both prevention of peeling during wearing and wearing, and ease of tearing during disposal.

In at least one of the waist end region 8c and the leg end region 8d where the long seal row SL1 is arranged, 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 .
In this case, as in the first embodiment, the fusion inhibitor 9 is applied to the skin-side sheet P and the adjacent sheet in at least one of the waist end region 8c and the leg end region 8d where the long seal rows SL1 are arranged. Q. In the example shown in FIG. 13, the fusion inhibitor 9 is placed in the ventral region 5a, but as described above, it may also be placed in the dorsal region 5b. It may be arranged on both sides.

Also in this embodiment, the side joint portion 8 includes a first laminated portion T1 in which six or more thermoplastic sheets 50 including the first skin side sheet P1 are laminated, and a first laminated portion including the second skin side sheet P2. and a second laminated portion T2 in which the thermoplastic sheets 50 are laminated in a number smaller than that of the portion T1. In this example, the first laminated portion T1 corresponds to a region where the exterior body 5 is folded.
Furthermore, in the present embodiment, the first laminated portion T1 includes regions in which the thermoplastic sheets 50 are laminated in different numbers. That is, the first laminated portion T1 includes a leg-side laminated portion T12 adjacent to the second laminated portion T2 and having more thermoplastic sheets 50 laminated than the second laminated portion T2, and a leg-side laminated portion T12 having more thermoplastic sheets 50 than the leg-side laminated portion T12. and a waist side laminated portion T11 in which a number of thermoplastic sheets 50 are laminated.

In the example shown in FIG. 13, the waist-side laminated portion 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 laminated portion T11 of the back region 5b is also composed of the same four layers. Thus, the waist-side laminated portion T11 is composed of a total of eight layers.
In addition, the leg-side laminated portion T12 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. The leg-side laminated portion T12 of the dorsal region 5b is also composed of the same three layers. Thus, the leg-side laminated portion T12 is composed of a total of six layers.
In both the waist-side laminated portion T11 and the leg-side laminated portion T12, the first skin-side sheet P1 is composed of the folded outer layer sheet 51 .
In the example shown in FIG. 13, the second laminated portion 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 portion T2 of the dorsal region 5b is also composed of two similar layers. As a result, the second lamination part T2 is composed of a total of four layers. In the second laminated portion T2, the second skin side sheet P2 is composed of the inner layer sheet 52 that is not folded back.

Also in this configuration, as in the first embodiment, at least part of the short seal line SL2 is arranged in the first lamination section T1, and at least part of the long seal line SL1 is arranged in the second lamination section T2. preferably.
In addition, the first skin-side sheet P1 and the second skin-side sheet P2 may be configured as described in the section "Configuration example of the skin-side sheet in the first laminated portion and the second laminated portion" of the first embodiment. can. As a result, the joint strength of the entire side joint portion 8 can be further stabilized.

<Fourth Embodiment>
In the pants-type absorbent article of the present invention, the exterior body 5 may not have a folded structure.
In this embodiment, as shown in FIG. 14, 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.
In other words, in this example, the exterior body 5 is entirely 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, the inner layer sheet 52 serves as the skin-side sheet P constituting the skin-facing surface in the entire side joint portion 8 .

In the underpants-type absorbent article of the present embodiment, the side joints 8 also have the long seal line SL1 and the short seal line SL2 located in at least one of the waist end region 8c and the leg end region 8d. , Each long seal portion S1 includes an inner seal area S11 located inside in the lateral direction Y and an outer seal area S12 located outside in the lateral direction Y and having a higher seal strength than the inner seal area S11. As a result, it is possible to achieve both prevention of peeling during wearing and wearing, and ease of tearing during disposal.

Also in this case, as in the first embodiment, the fusion inhibitor 9 is added to the waist end region 8c where the long seal row SL1 is arranged or the leg region from the viewpoint of effectively reducing the joint strength of the intersection 9s. It is preferable to arrange between the skin-side sheet P and the adjacent sheet Q in at least one of the end regions 8d. In the example shown in FIG. 14, the fusion inhibitor 9 is placed in both the ventral region 5a and the dorsal region 5b, but as described above, it can be placed in either the ventral region 5a or the dorsal region 5b. may

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 containing a plurality of embossments, and the distance between the embossments is preferably substantially constant throughout the side joints 8 . It should be noted that "the distance between embossments is substantially constant" means that when the shortest distance between 10 or more embossments is compared, the smallest distance is 100%, and the largest distance is 110% or less. means it fits.
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.

<Fifth Embodiment>
In the first embodiment, the case where the long seal line SL1 is arranged in the leg end region 8d has been described, but as shown in FIG. 15, the long seal line SL1 may be arranged in the waist end region 8c. . In this case, the long seal row SL1 is arranged on the waist end portion 8a side, and the short seal row SL2 is arranged on the leg end portion 8b side. As a result, even when the wearer is in a standing position and the disposal person tears the side joints 8 from the waist end 8a, the ease of tearing described above can be achieved.

Alternatively, as shown in FIG. 16, the long seal row SL1 includes a waist end region 8c within 25 mm in the longitudinal direction X from the waist end 8a and a leg end region within 25 mm in the longitudinal direction X from the leg end 8b. 8d may be arranged in the combined area. In this case, the long seal row SL1 is arranged on the waist end 8a side and the leg end 8b side, and the short seal row SL2 is arranged on the longitudinal direction X central side. As a result, even when the disposal person tears the side joints 8 from either the waist end 8a or the leg end 8b, the ease of tearing described above can be realized.

<Sixth embodiment>
In the pants-type absorbent article according to the sixth embodiment of the present invention, as described in the first embodiment, in the long seal portion S1, the degree of melting of the fibers in the outer seal region S12 is the same as that of the fibers in the inner seal region S11. higher than the degree of melting. The method of calculating the degree of melting of the fibers can be performed by the method described in the section "Method of calculating the degree of melting of each sealing region" in the first embodiment.
Furthermore, in the present embodiment, from the viewpoint of further improving the ease of tearing and more reliably preventing peeling during wearing and wearing operation, the inner seal region S11 is not completely melted, and some fibers characterized by remaining undissolved. A specific configuration according to this embodiment will be described below.

[Construction regarding degree of melting of fibers]
As shown in FIG. 17A, the inner seal region S11 was formed in the thickness direction Z when a cross section parallel to the lateral direction Y and the thickness direction Z of the inner seal region S11 was magnified 500 times and observed. It has unevenness 55b. Such irregularities 55b originate from undissolved fibers.
The presence or absence of the unevenness 55b referred to here can be determined as follows. First, a measurement sample including the YZ cross section of the inner seal region S11 is prepared and fixed by a known method in the same manner as in the “Method for Calculating Degree of Melting of Each Seal Region”. A YZ cross section of the measurement sample is imaged with a scanning electron microscope (SEM) at a magnification of 500 times. In the captured image, it is confirmed whether the unevenness 55b formed in the thickness direction Z on the outer edge 55a of the inner seal region S11, that is, at least one convex portion and at least one concave portion can be visually recognized. The protrusion shape of the protrusion is not limited, and it is sufficient that the protrusion rises in the thickness direction Z from the outer edge 55a. When the unevenness 55b is visually recognized, the smallest thickness ds in the thickness direction Z and the largest thickness dt in the thickness direction Z are measured using image analysis software or the like in the imaged image, and the thickness dt with respect to the thickness ds is measured. Calculate the ratio (dt/ds). When the average value of dt/ds calculated from five or more images is 1.05 or more, it is determined that the inner seal region S11 has the unevenness 55b.

In the above configuration, since some fibers remain undissolved, when the side joint portion 8 is torn, the fibers themselves in the inner seal region S11 do not break, but the fibers easily separate at the fusion points of the fibers. Become. In other words, in the above configuration, the interface between the thermoplastic sheet 50 in the ventral region 5a and the dorsal region 5b that constitute the inner seal region S11 is likely to be torn so as to separate. As a result, when the disposal person applies a tearing force having both components of the center side in the longitudinal direction X and the outer side in the lateral direction Y, the inner seal region S11 can be stably torn along the direction of the tearing force. Ease of use can be further improved.
Also, if the fibers are completely melted, a compacted film-like seal portion can be formed, but defects such as holes are likely to occur due to unevenness of the resin. In contrast, in the present embodiment, since the inner seal region S11 is not completely melted, defects such as holes due to film formation are less likely to occur in the inner seal region S11. As a result, the seal strength in the inner seal region S11 can be stabilized, and peeling during wearing and wearing can be prevented more effectively.

On the other hand, in the outer seal region S12, as shown in FIG. 17B, the irregularities of the outer edge 55a may not be clearly formed, but it is preferable that the fibers are not completely fused. It is preferable that the degree of crimping by the bonding is not too high. From this point of view, the ratio of the average thickness of the inner seal region S11 to the average thickness of the outer seal region S12 is preferably 102% or more, more preferably 104% or more, and preferably 200% or less, more preferably 180%. % or less. The average thicknesses of the outer seal region S12 and the inner seal region S11 can be calculated by the method described in the above section "Method for measuring the average thickness of each seal region".

With the above configuration, the difference in average thickness between the inner seal region S11 and the outer seal region S12 can be reduced, and the difference in the degree of melting and crimping between them can be appropriately reduced. As a result, when tearing the side joint portion 8, tearing from the inner seal region S11 toward the outer seal region S12 can be performed smoothly and stably. Therefore, it is possible to further improve tearability of the entire long seal row SL1.

Furthermore, as shown in FIG. 17B, when a cross section of the outer seal region S12 parallel to the lateral direction Y and the thickness direction Z is observed by magnifying it 500 times, the outer seal region S12 is It may include fiber traces 55c that are streaked inwardly from the outer edge 55a. The direction in which the fiber traces 55c extend is not particularly limited, and may extend from the outer edge 55a of the outer seal region S12 toward the central portion in the thickness direction Z. The fiber traces 55c can be confirmed from an image obtained by magnifying the YZ cross section of the measurement sample prepared in the same manner as in the above-described "Method for measuring the average thickness of each seal area" by 500 times with an SEM. can be done.

In the outer seal region S12 having the above configuration, the fibers may not be completely melted while increasing the sealing strength. As a result, problems such as holes due to film formation are less likely to occur in the outer seal region S12, and the seal strength of the outer seal region S12 is stabilized. Therefore, it is possible to more reliably prevent peeling during wearing and wearing operation.

[Example of seal arrangement]
In this embodiment, as described above, the tearability of the long seal row SL1 is enhanced. Therefore, as shown in FIG. 18, the side joint portion 8 should have at least the long seal line SL1, and should not have the short seal line SL2 (see FIG. 3, etc.) having the short seal portion S2. may In this example, all the seal portions S forming the side joint portion 8 can be long seal portions S1.

Alternatively, also in this embodiment, as in the configurations described in the first and fifth embodiments (FIGS. 3, 15, and 16), the side joint portion 8 has a plurality of long seal portions S1 extending in the longitudinal direction X. and arranged in at least one of the leg end region 8d or the waist end region 8c, and a plurality of short seal portions S2 are spaced apart and aligned along the longitudinal direction X. However, the long seal line SL1 and the short seal line SL2 arranged adjacent to each other in the longitudinal direction X may be provided.

[Other configuration examples]
To the pants-type absorbent article of this embodiment, the configurations described in the above-described first to fifth embodiments can be applied to the extent possible.
For example, the underpants-type absorbent article may have the fusion inhibitor 9 linearly provided between the thermoplastic sheets 50, as described in the section "Arrangement Example of the Fusion Inhibitor" in the first embodiment. You may apply the structure demonstrated by suitably.
In addition, the pants-type absorbent article may include a plurality of elastic members 10 in the ventral region 5a and the dorsal region 5b of the outer body 5. The described configuration may be applied as appropriate.
Further, the pants-type absorbent article may have the outer body 5 having the configuration described in the section "Structural example of the outer body" in the first embodiment. In addition, in the present embodiment, the configuration related to folding of the exterior body 5 can be appropriately selected from the configurations described in each of the above-described embodiments.

<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.

In the above-described embodiment, the pair of side joints 8 have the same configuration, but only one side joint 8 has the configuration including the above-described long seal row SL1 (and short seal row SL2). may be

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.

Regarding the above-described embodiment, the present invention further discloses the following pants-type absorbent article.
<1>
a longitudinal direction extending from the abdomen of the wearer to the dorsal side through the groin; and a lateral direction perpendicular to the longitudinal direction and corresponding to the lateral direction of the wearer;
An absorbent main body, and an outer covering composed of a plurality of laminated thermoplastic sheets, including an absorbent main body and a ventral region and a dorsal region disposed on the non-skin-facing side of the absorbent main body and positioned on both sides in the longitudinal direction. A pants-type absorbent article comprising a body and a pair of side joints that join the ventral region and the dorsal region of the outer body at the lateral side edges,
The pair of side joints are
a waist edge region within 25 mm in the longitudinal direction from the waist edge constituting the waist-side edge in the longitudinal direction;
a leg end region within 25 mm in the longitudinal direction from the leg end constituting the leg-side end in the longitudinal direction;
At least one of the pair of side joints,
a row of long seals in which the plurality of long seal portions elongated in the lateral direction are aligned along the longitudinal direction and are arranged in at least one of the waist end region and the leg end region;
A plurality of short seal portions having a length in the horizontal direction shorter than that of the long seal portions are aligned along the longitudinal direction while being spaced apart from each other, and the short seal rows are arranged adjacent to the long seal rows in the longitudinal direction. further comprising a seal row;
Each long seal portion includes an inner seal region positioned on the inner side in the lateral direction and an outer seal region positioned on the outer side in the lateral direction and having a higher seal strength than the inner seal region.
<2>
The pants-type absorbent article according to <1>, wherein the degree of melting of the fibers in the outer seal region is higher than the degree of melting of the fibers in the inner seal region.
<3>
The pants-type absorbent article according to <1> or <2>, wherein the average thickness of the outer seal region is thinner than the average thickness of the inner seal region.
<4>
The underpants-type absorbent article according to any one of <1> to <3>, wherein the seal strength of the outer seal region is higher than the seal strength of the short seal portion.
<5>
The underpants-type absorbent article according to <4>, wherein the degree of melting of the fibers in the outer seal region is higher than the degree of melting of the fibers in the short seal portion.
<6>
The pants-type absorbent article according to <4> or <5>, wherein the average thickness of the outer seal regions is thinner than the average thickness of the short seal portions.
<7>
The positions of the laterally inner inner end portions of the plurality of long seal portions are aligned in the lateral direction with the positions of the laterally inner inner end portions of the plurality of short seal portions <1> to <6>, the underpants-type absorbent article.
<8>
In the long seal row, the plurality of long seal portions are arranged in the longitudinal direction at intervals of a first dimension,
The underpants-type absorbent article according to any one of <1> to <7>, wherein the first dimension is larger than a second dimension that is half the lateral dimension of the long seal portion.
<9>
The underpants-type absorbent article according to any one of <1> to <8>, wherein a pitch of the plurality of long seal portions in the longitudinal direction is 1.5 mm or more and 5.0 mm or less.
<10>
at least one of the waist end region and the leg end region where the long seal rows are arranged has a fusion inhibitor linearly provided between the thermoplastic sheets;
Any of <1> to <8>, wherein the plurality of long seal portions excluding at least the long seal portion closest to the longitudinal end constitutes a plurality of cross seal portions having crossing portions that intersect with the fusion inhibitor. 1. The pants-type absorbent article according to claim 1.
<11>
The cross seal portion located closest to the longitudinal end portion constitutes a first cross seal portion,
The cross seal portion adjacent to the first cross seal portion constitutes a second cross seal portion,
The first and second cross seal portions cross the fusion inhibitor at positions other than the outer and inner ends on both sides in the lateral direction,
The side joints, including the first and second cross seals,
α1 is the crossing angle between the fusion inhibitor and the first cross seal portion on the longitudinal end side and the laterally inner side, and the crossing angle on the longitudinally central side and the laterally outer side is Let α2 be
α3 is the crossing angle between the fusion inhibitor and the second cross seal portion on the longitudinal end side and the laterally inner side, and the crossing angle on the longitudinally central side and the laterally outer side is The underpants-type absorbent article according to <9>, which satisfies the following formula (1) when α4.
5 degrees < α1 ≤ α2 < α3 ≤ α4 < 90 degrees (1)
<12>
The underpants-type absorbent article according to <11>, 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)'
<13>
The plurality of long seal portions have three 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 crossing angle between the k-th crossing seal portion on the center side in the longitudinal direction from the first crossing seal portion and the fusion inhibitor on the side of the longitudinal end portion and on the inner side in the lateral direction is α(2k -1), and when the crossing angle on the center side in the vertical direction and on the outer side in the horizontal direction is α (2k), the following formulas (2) and (3) are satisfied <11> or <12> A pant-type absorbent article as described.
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)
<14>
The underpants-type absorbent article according to <13>, 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)'
<15>
The plurality of cross seal portions are
intersects with the fusion inhibitor at positions other than the outer and inner ends on both sides in the lateral direction, and
Over a region of 10 mm or more in the longitudinal direction, the intersecting distance between the inner end portion and the intersecting portion monotonically increases from the longitudinal end side toward the longitudinal center side. The pants-type absorbent article according to any one of <10> to <14>.
<16>
The underpants-type absorbent article according to any one of <10> to <15>, wherein the crossing portions of the plurality of crossing seal portions have substantially the same width in the lateral direction.
<17>
The underpants-type absorbent article according to any one of <10> to <16>, wherein the fusion inhibitor comprises at least part of a spiral or wavy curve.
<18>
The plurality of thermoplastic sheets include, in at least one of the waist end region and the leg end region where the long seal rows are arranged, a skin-side sheet forming a skin-facing surface of the exterior body, and a skin-side sheet adjacent thereto. an adjacent sheet; and
The underpants-type absorbent article according to any one of <10> to <17>, wherein the fusion inhibitor is disposed between the skin-side sheet and the adjacent sheet.
<19>
The underpants-type absorbent article according to <18>, wherein the depth of permeation of the fusion inhibitor in the skin-side sheet is greater than the depth of permeation of the fusion inhibitor in the adjacent sheet.
<20>
The ventral region and the dorsal region, respectively,
A plurality of elastic members extending in the lateral direction are arranged and have a first stretchable region and a second stretchable region extending in the lateral direction from one to the other of the pair of side joints,
the first elastic region extends in the lateral direction from the waist end region;
the second stretchable region is adjacent to the first stretchable region in the longitudinal direction and extends in the lateral direction from a region of the side joints excluding the waist end region;
According to any one of <1> to <19>, the average elongation rate of the plurality of elastic members in the first elastic region is lower than the average elongation rate of the plurality of elastic members in the second elastic region. A pants-type absorbent article.
<21>
The side joints are
a first laminated portion in which six or more thermoplastic sheets are laminated;
a second laminated portion in which the thermoplastic sheets are laminated in a number smaller than that of the first laminated portion;
At least part of the short seal row is arranged in the first laminated portion,
The underpants-type absorbent article according to any one of <1> to <20>, wherein at least part of the long seal row is arranged on the second laminated portion.
<22>
The underpants-type absorbent article according to <21>, wherein the short seal row extends from the first laminated portion to a part of the second laminated portion.
<23>
The side joints are
a first laminated portion in which six or more thermoplastic sheets including a first skin-side sheet constituting a skin-facing surface are laminated;
a second laminated portion including a second skin-side sheet forming a skin-facing surface and having a smaller number of thermoplastic sheets laminated than the first laminated portion;
The first skin-side sheet and the second skin-side sheet are each composed of a spunbond nonwoven fabric containing a plurality of embossments,
The underpants-type absorbent article according to any one of <1> to <22>, wherein the embossed area ratio of the first skin-side sheet is higher than the embossed area ratio of the second skin-side sheet.
<24>
The side joints are
a first laminated portion in which six or more thermoplastic sheets including a first skin-side sheet constituting a skin-facing surface are laminated;
a second laminated portion including a second skin-side sheet forming a skin-facing surface and having a smaller number of thermoplastic sheets laminated than the first laminated portion;
The underpants-type absorbent article according to any one of <1> to <23>, wherein the melting point of the first skin-side sheet is higher than the melting point of the second skin-side sheet.
<25>
The side joints are
a first laminated portion in which six or more thermoplastic sheets including a first skin-side sheet constituting a skin-facing surface are laminated;
a second laminated portion including a second skin-side sheet forming a skin-facing surface and having a smaller number of thermoplastic sheets laminated than the first laminated portion;
The pants-type absorbent article according to any one of <1> to <24>, wherein the basis weight of the first skin-side sheet is lower than the basis weight of the second skin-side sheet.
<26>
The underpants-type absorbent article according to any one of <1> to <25>, wherein in the side joints, seal portions are not arranged laterally outside the short seal rows.
<27>
A longitudinal direction extending from the abdomen of the wearer to the dorsal side through the crotch, a lateral direction orthogonal to the longitudinal direction and corresponding to the lateral direction of the wearer, and a thickness direction orthogonal to the longitudinal direction and the lateral direction. and
An absorbent main body, and an outer covering composed of a plurality of laminated thermoplastic sheets, including an absorbent main body and a ventral region and a dorsal region disposed on the non-skin-facing side of the absorbent main body and positioned on both sides in the longitudinal direction. A pants-type absorbent article comprising a body and a pair of side joints that join the ventral region and the dorsal region of the outer body at the lateral side edges,
The pair of side joints are
a waist edge region within 25 mm in the longitudinal direction from the waist edge, which is the waist-side edge in the longitudinal direction;
a leg end region within 25 mm in the longitudinal direction from the leg end, which is the leg-side end in the longitudinal direction;
At least one of the pair of side joints,
the plurality of laterally elongated long seal portions are spaced apart and aligned along the longitudinal direction and have a row of long seals disposed in at least one of the waist end region or the leg end region;
Each long seal portion includes an inner seal region located on the inner side in the lateral direction and an outer seal region located on the outer side in the lateral direction and having a higher seal strength than the inner seal region,
The degree of melting of the fibers in the outer seal region is higher than the degree of melting of the fibers in the inner seal region,
The inner seal region has irregularities formed in the thickness direction when a cross section of the inner seal region parallel to the lateral direction and the thickness direction is observed at a magnification of 500 times.
<28>
The underpants-type absorbent article according to <27>, wherein the ratio of the average thickness of the inner seal region to the average thickness of the outer seal region is 102% or more and 200% or less.
<29>
In the long seal row, the plurality of long seal portions are arranged in the longitudinal direction at intervals of a first dimension,
The pants-type absorbent article according to <27> or <28>, wherein the first dimension is larger than a second dimension that is half the lateral dimension of the long seal portion.
<30>
The underpants-type absorbent article according to any one of <27> to <29>, wherein the longitudinal pitch of the plurality of long seal portions is 1.5 mm or more and 5.0 mm or less.
<31>
at least one of the waist end region and the leg end region where the long seal rows are arranged has a fusion inhibitor linearly provided between the thermoplastic sheets;
Any of <27> to <30>, wherein the plurality of long seal portions excluding at least the long seal portion closest to the longitudinal end constitutes a plurality of cross seal portions having crossing portions that intersect with the fusion inhibitor 1. The pants-type absorbent article according to claim 1.
<32>
The cross seal portion located closest to the longitudinal end portion constitutes a first cross seal portion,
The cross seal portion adjacent to the first cross seal portion constitutes a second cross seal portion,
The first and second cross seal portions cross the fusion inhibitor at positions other than the outer and inner ends on both sides in the lateral direction,
The side joints, including the first and second cross seals,
α1 is the crossing angle between the fusion inhibitor and the first cross seal portion on the longitudinal end side and the laterally inner side, and the crossing angle on the longitudinally central side and the laterally outer side is Let α2 be
α3 is the crossing angle between the fusion inhibitor and the second cross seal portion on the longitudinal end side and the laterally inner side, and the crossing angle on the longitudinally central side and the laterally outer side is The underpants-type absorbent article according to <31>, which satisfies the following formula (1) when α4.
5 degrees < α1 ≤ α2 < α3 ≤ α4 < 90 degrees (1)
<33>
The pants-type absorbent article according to <32>, 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)'
<34>
The plurality of long seal portions have three 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 crossing angle between the k-th crossing seal portion on the center side in the longitudinal direction from the first crossing seal portion and the fusion inhibitor on the side of the longitudinal end portion and on the inner side in the lateral direction is α(2k -1), and when the crossing angle on the center side in the vertical direction and on the outer side in the horizontal direction is α (2k), the following formulas (2) and (3) are satisfied <32> or <33> A pant-type absorbent article as described.
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)
<35>
The underpants-type absorbent article according to <34>, 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)'
<36>
The plurality of cross seal portions are
intersects with the fusion inhibitor at positions other than the outer and inner ends on both sides in the lateral direction, and
Over a region of 10 mm or more in the longitudinal direction, the intersecting distance between the inner end portion and the intersecting portion monotonically increases from the longitudinal end side toward the longitudinal center side. The pants-type absorbent article according to any one of <31> to <35>.
<37>
The underpants-type absorbent article according to any one of <31> to <36>, wherein widths in the lateral direction of the crossing portions of the plurality of crossing seal portions are substantially the same.
<38>
The underpants-type absorbent article according to any one of <31> to <37>, wherein the fusion inhibitor comprises at least part of a spiral or wavy curve.
<39>
The plurality of thermoplastic sheets include, in at least one of the waist end region and the leg end region where the long seal rows are arranged, a skin-side sheet forming a skin-facing surface of the exterior body, and a skin-side sheet adjacent thereto. an adjacent sheet; and
The underpants-type absorbent article according to any one of <31> to <38>, wherein the fusion inhibitor is disposed between the skin-side sheet and the adjacent sheet.
<40>
The underpants-type absorbent article according to <39>, wherein the depth of permeation of the fusion inhibitor in the skin-side sheet is greater than the depth of permeation of the fusion inhibitor in the adjacent sheet.
<41>
The ventral region and the dorsal region, respectively,
A plurality of elastic members extending in the lateral direction are arranged and have a first stretchable region and a second stretchable region extending in the lateral direction from one to the other of the pair of side joints,
the first elastic region extends in the lateral direction from the waist end region;
the second stretchable region is adjacent to the first stretchable region in the longitudinal direction and extends in the lateral direction from a region of the side joints excluding the waist end region;
According to any one of <27> to <40>, the average elongation rate of the plurality of elastic members in the first elastic region is lower than the average elongation rate of the plurality of elastic members in the second elastic region. A pants-type absorbent article.
<42>
At least one of the pair of side joints where the long seal row is arranged,
A plurality of short seal portions having a length in the lateral direction shorter than that of the long seal portions are aligned along the longitudinal direction with a space therebetween, and the short seal portions are arranged adjacent to the long seal rows in the longitudinal direction. The underpants-type absorbent article according to any one of <27> to <41>, further comprising a seal row.
<43>
The underpants-type absorbent article according to <42>, wherein the seal strength of the outer seal region is higher than the seal strength of the short seal portion.
<44>
The underpants-type absorbent article according to <43>, wherein the degree of melting of the fibers in the outer seal region is higher than the degree of melting of the fibers in the short seal portion.
<45>
The underpants-type absorbent article according to <43> or <44>, wherein the average thickness of the outer seal regions is thinner than the average thickness of the short seal portions.
<46>
The positions of the laterally inner inner end portions of the plurality of long seal portions are aligned in the lateral direction with the positions of the laterally inner inner end portions of the plurality of short seal portions <42> to <45>, the pants-type absorbent article.
<47>
The side joints are
a first laminated portion in which six or more thermoplastic sheets are laminated;
a second laminated portion in which the thermoplastic sheets are laminated in a number smaller than that of the first laminated portion;
At least part of the short seal row is arranged in the first laminated portion,
The underpants-type absorbent article according to any one of <42> to <46>, wherein at least part of the long seal row is arranged in the second laminated portion.
<48>
The underpants-type absorbent article according to <47>, wherein the short seal row extends from the first laminated portion to a part of the second laminated portion.
<49>
The underpants-type absorbent article according to any one of <42> to <48>, in which, in the side joints, seal portions are not arranged outside the short seal rows in the lateral direction.
<50>
The side joints are
a first laminated portion in which six or more thermoplastic sheets including a first skin-side sheet constituting a skin-facing surface are laminated;
a second laminated portion including a second skin-side sheet forming a skin-facing surface and having a smaller number of thermoplastic sheets laminated than the first laminated portion;
The first skin-side sheet and the second skin-side sheet are each composed of a spunbond nonwoven fabric containing a plurality of embossments,
The underpants-type absorbent article according to any one of <27> to <49>, wherein the embossed area ratio of the first skin-side sheet is higher than the embossed area ratio of the second skin-side sheet.
<51>
The side joints are
a first laminated portion in which six or more thermoplastic sheets including a first skin-side sheet constituting a skin-facing surface are laminated;
a second laminated portion including a second skin-side sheet forming a skin-facing surface and having a smaller number of thermoplastic sheets laminated than the first laminated portion;
The underpants-type absorbent article according to any one of <27> to <50>, wherein the melting point of the first skin-side sheet is higher than the melting point of the second skin-side sheet.
<52>
The side joints are
a first laminated portion in which six or more thermoplastic sheets including a first skin-side sheet constituting a skin-facing surface are laminated;
a second laminated portion including a second skin-side sheet forming a skin-facing surface and having a smaller number of thermoplastic sheets laminated than the first laminated portion;
The pants-type absorbent article according to any one of <27> to <51>, wherein the basis weight of the first skin-side sheet is lower than the basis weight of the second skin-side sheet.
<53>
When a cross section of the outer seal region parallel to the lateral direction and the thickness direction is magnified 500 times and observed, the outer seal region is formed in a streaky shape extending inward from the outer edge in the thickness direction. The underpants-type absorbent article according to any one of <27> to <52>, including fiber traces.

1 … Pants-type absorbent article (disposable diaper, diaper)
4 Absorbent body 5 Exterior body 5a Abdominal region 5b Back region 50 Thermoplastic sheet 8 Side joint 8a Waist end 8b Leg end 8c Waist end region 8d Leg end Region S1 Long seal portion S2 Short seal portion SL1 Long seal row SL2 Short seal row S11 Inner seal region S12 Outer seal region

Claims (13)

A longitudinal direction extending from the abdomen of the wearer to the dorsal side through the crotch, a lateral direction orthogonal to the longitudinal direction and corresponding to the lateral direction of the wearer, and a thickness direction orthogonal to the longitudinal direction and the lateral direction. and
An absorbent main body, and an outer covering composed of a plurality of laminated thermoplastic sheets, including an absorbent main body and a ventral region and a dorsal region disposed on the non-skin-facing side of the absorbent main body and positioned on both sides in the longitudinal direction. A pants-type absorbent article comprising a body and a pair of side joints that join the ventral region and the dorsal region of the outer body at the lateral side edges,
The pair of side joints are
a waist edge region within 25 mm in the longitudinal direction from the waist edge, which is the waist-side edge in the longitudinal direction;
a leg end region within 25 mm in the longitudinal direction from the leg end, which is the leg-side end in the longitudinal direction;
At least one of the pair of side joints,
the plurality of laterally elongated long seal portions are spaced apart and aligned along the longitudinal direction and have a row of long seals disposed in at least one of the waist end region or the leg end region;
Each long seal portion includes an inner seal region located on the inner side in the lateral direction and an outer seal region located on the outer side in the lateral direction and having a higher seal strength than the inner seal region,
The degree of melting of the fibers in the outer seal region is higher than the degree of melting of the fibers in the inner seal region,
When a cross section of the inner seal region parallel to the lateral direction and the thickness direction is magnified 500 times and observed, the inner seal region has unevenness formed in the thickness direction,
at least one of the waist end region and the leg end region where the long seal rows are arranged has a fusion inhibitor linearly provided between the thermoplastic sheets;
The plurality of long seal portions excluding at least the long seal portion closest to the longitudinal end constitutes a plurality of cross seal portions having crossing portions crossing the fusion inhibitor,
The plurality of cross seal portions are
intersects with the fusion inhibitor at positions other than the outer and inner ends on both sides in the lateral direction, and
Over a region of 10 mm or more in the longitudinal direction, the intersecting distance between the inner end portion and the intersecting portion monotonically increases from the longitudinal end side toward the longitudinal center side.
A pants-type absorbent article. The pants-type absorbent article according to claim 1, wherein the ratio of the average thickness of the inner seal region to the average thickness of the outer seal region is 102% or more and 200% or less. In the long seal row, the plurality of long seal portions are arranged in the longitudinal direction at intervals of a first dimension,
3. The claim 1 or 2, wherein in at least one of the waist end region or the leg end region, the first dimension is greater than a second dimension that is half the lateral dimension of the long seal portion. pants-type absorbent article. The cross seal portion located closest to the longitudinal end portion constitutes a first cross seal portion,
The cross seal portion adjacent to the first cross seal portion constitutes a second cross seal portion,
The first and second cross seal portions cross the fusion inhibitor at positions other than the outer and inner ends on both sides in the lateral direction,
The side joints, including the first and second cross seals,
α1 is the crossing angle between the fusion inhibitor and the first cross seal portion on the longitudinal end side and the laterally inner side, and the crossing angle on the longitudinally central side and the laterally outer side is Let α2 be
α3 is the crossing angle between the fusion inhibitor and the second cross seal portion on the longitudinal end side and the laterally inner side, and the crossing angle on the longitudinally central side and the laterally outer side is The underpants-type absorbent article according to claim 1 , wherein the following formula (1) is satisfied when α4.
5 degrees < α1 ≤ α2 < α3 ≤ α4 < 90 degrees (1) The plurality of thermoplastic sheets include, in at least one of the waist end region and the leg end region where the long seal rows are arranged , a skin-side sheet forming a skin-facing surface of the exterior body, and a skin-side sheet adjacent thereto. an adjacent sheet; and
The underpants-type absorbent article according to claim 1 or 4, wherein the fusion inhibitor is arranged between the skin-side sheet and the adjacent sheet. At least one of the pair of side joints where the long seal rows are arranged,
A plurality of short seal portions having a length in the lateral direction shorter than that of the long seal portions are aligned along the longitudinal direction with a space therebetween, and the short seal portions are arranged adjacent to the long seal rows in the longitudinal direction. The pants-type absorbent article according to Claim 1 , further comprising a seal row. The pants-type absorbent article according to claim 6 , wherein the seal strength of the outer seal regions is higher than the seal strength of the short seal portions. 8. Positions of the laterally inner inner end portions of the plurality of long seal portions are aligned in the lateral direction with positions of the laterally inner inner end portions of the plurality of short seal portions. The pants-type absorbent article according to 1. The side joints are
a first laminated portion in which six or more thermoplastic sheets are laminated;
a second laminated portion in which the thermoplastic sheets are laminated in a number smaller than that of the first laminated portion;
At least part of the short seal row is arranged in the first laminated portion,
The underpants-type absorbent article according to claim 6 or 7 , wherein at least part of the long seal row is arranged on the second laminated portion. The underpants-type absorbent article according to claim 9 , wherein the short seal row extends from the first laminated portion to part of the second laminated portion. The side joints are
a first laminated portion in which six or more thermoplastic sheets including a first skin-side sheet constituting a skin-facing surface are laminated;
a second laminated portion including a second skin-side sheet forming a skin-facing surface and having a smaller number of thermoplastic sheets laminated than the first laminated portion;
The first skin-side sheet and the second skin-side sheet are each composed of a spunbond nonwoven fabric containing a plurality of embossments,
The underpants-type absorbent article according to claim 1 , wherein the embossed area ratio of the first skin-side sheet is higher than the embossed area ratio of the second skin-side sheet. The side joints are
a first laminated portion in which six or more thermoplastic sheets including a first skin-side sheet constituting a skin-facing surface are laminated;
a second laminated portion including a second skin-side sheet forming a skin-facing surface and having a smaller number of thermoplastic sheets laminated than the first laminated portion;
The underpants-type absorbent article according to claim 1 , 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 laminated portion in which six or more thermoplastic sheets including a first skin-side sheet constituting a skin-facing surface are laminated;
a second laminated portion including a second skin-side sheet forming a skin-facing surface and having a smaller number of thermoplastic sheets laminated than the first laminated portion;
The underpants-type absorbent article according to claim 1 , wherein the basis weight of the first skin-side sheet is lower than the basis weight of the second skin-side sheet.

Images