CN117177724A

CN117177724A - Pants-type sanitary towel and pants-type sanitary towel set

Info

Publication number: CN117177724A
Application number: CN202180097170.4A
Authority: CN
Inventors: 高桥雄二; 柏木政浩; 史异; 唐亚男; 田玉玲
Original assignee: Unicharm Corp
Current assignee: Unicharm Corp
Priority date: 2021-05-10
Filing date: 2021-12-13
Publication date: 2023-12-05
Also published as: JP2022173945A; KR20240006546A; WO2022239287A1; TW202308578A

Abstract

A waist portion (20) of a pants-type sanitary napkin (1) having an absorbent main body (10) and a waist portion (20) and having a first size has a plurality of heat-bonded portions (60), and the waist portion has stretchability in the left-right direction, and has an overlapping region (R1) where the absorbent main body (10) overlaps the waist portion (20) and a non-overlapping region (R2) where the absorbent main body does not overlap when viewed in plan in an expanded state, and the total area of the heat-bonded portions (60) provided per unit area in either one of the overlapping region (R1) and the non-overlapping region (R2) is different from the area of other pants-type sanitary napkins (1) having the same brand name and sub-brand name as the pants-type sanitary napkin (1) and having a second size.

Description

Pants-type sanitary towel and pants-type sanitary towel set

Technical Field

The present specification relates to a pants-type sanitary napkin and a pants-type sanitary napkin set.

Background

Conventionally, when an absorbent article such as a shorts-type sanitary napkin is sold, a commodity group having a plurality of sizes such as an M-code and an L-code and being assigned the same brand name or a sub-brand name is commonly distributed on the market. In such an absorbent article, a method is known in which the strength of stretchability and the like are adjusted for each size to achieve good fit for each size. For example, patent document 1 discloses a method of changing the force properties of elastic members (elastic strands) provided in waistline units (bands) of absorbent articles of different sizes to adjust the elastic modulus, thereby achieving proper wearability.

Prior art literature

Patent literature

Patent document 1: japanese patent laid-open publication 2016-523634

Technical problem to be solved by the invention

In the pants-type sanitary napkins of different sizes as disclosed in patent document 1, there is a problem that it is difficult to visually recognize the difference in stretchability even if the stretchability of the waistline portion is changed. That is, it is difficult for the user to judge how the fit of the absorbent article varies depending on the difference in size from one appearance to another.

Disclosure of Invention

The present invention has been made in view of the above-described problems, and an object of the present invention is to provide a pants-type sanitary napkin which is easy to understand from the external appearance that the fitting properties are different depending on the difference in size.

Technical means for solving the technical problems

The main invention for achieving the above object is a pants-type sanitary napkin having a top-bottom direction and a left-right direction intersecting each other, and having an absorbent main body and a waistline portion, the waistline portion being formed by joining together an abdomen-side waistline portion and a back-side waistline portion at both end portions in the left-right direction by a pair of side joining portions, the pants-type sanitary napkin having a first size, wherein the waistline portion has a skin-side sheet, a non-skin-side sheet, and a plurality of heat bonding portions joining the skin-side sheet and the non-skin-side sheet, and the waistline portion has stretchability in the left-right direction, and has an overlapping region where the absorbent main body overlaps the waistline portion and a non-overlapping region where the absorbent main body does not overlap the waistline portion, and a total area of the heat bonding portions provided per unit area in any one of the overlapping region and the non-overlapping region is different from another sanitary napkin having the same size as that of the pants-type sanitary napkin and another brand in a plan view of the same size.

Other features of the present invention will be apparent from the description of the present specification and the accompanying drawings.

ADVANTAGEOUS EFFECTS OF INVENTION

According to the present invention, it is possible to provide a pants-type sanitary napkin having a different fit according to the difference in size, which can be easily understood by the appearance.

Drawings

Fig. 1 is a schematic perspective view of a sanitary napkin 1.

Fig. 2 is a plan view of the sanitary napkin 1 in an expanded and stretched state when viewed from the skin side in the thickness direction.

Fig. 3 is a schematic cross-sectional view A-A of fig. 2.

Fig. 4 is a top view and a cross-sectional view of the absorbent body 10.

Fig. 5 is a view showing an example of a package when the sanitary napkin 1 is distributed in the market.

Fig. 6 is a plan view showing the arrangement of the pattern of the thermal bonding portion 60.

Fig. 7A and 7B are diagrams illustrating three types of arrangement of the thermal bonding portion 60.

Fig. 8 is a diagram illustrating wrinkles formed on the surface of the waistline portion 20 of the sanitary napkin 1.

Fig. 9A and 9B are views for explaining a method of attaching the linear elastic member 26 to the waistline portion 20 by the pair of heat-bonded portions 60.

Detailed Description

At least the following matters will be clarified by the description of the present specification and drawings.

A pants-type sanitary napkin having a pair of side joining portions at both ends in the left-right direction, the pair of side joining portions being joined to each other at both ends in the left-right direction, and having an absorptive body and a back-side waistline portion, the pants-type sanitary napkin having a first size, wherein the waistline portion has a skin-side sheet, a non-skin-side sheet, and a plurality of heat-bonded portions joining the skin-side sheet and the non-skin-side sheet, and the waistline portion has stretchability in the left-right direction, and has an overlapping region where the absorptive body overlaps the waistline portion and a non-overlapping region where the absorptive body does not overlap each other, and wherein the area of the heat-bonded portions provided per unit area in any one of the overlapping region and the non-overlapping region is equal to the area of another pants-type sanitary napkin having the same name and a second size in plan view of the pants-type sanitary napkin.

According to such a pants-type sanitary napkin, in a sanitary napkin having a large size, the area (area ratio) of the heat-bonding portion provided per unit area is set as small as possible, so that the waistline portion is easily deformed by the irregularities of the wearer's body, and a good fit is easily obtained. On the other hand, in a sanitary napkin having a small size, the irregularities of the wearer's body are small, so that good fitting properties of the waist section can be easily obtained even if the area ratio of the heat-bonded section is increased, and the deformed shape of the waist section can be easily maintained when fitting the body by increasing the area ratio of the heat-bonded section. Therefore, by changing the area ratio of the heat-bonding portion according to the difference in the size of the sanitary napkin, it is possible to easily understand the difference in the fit by the appearance.

In this pants-type sanitary napkin, at least one of the skin-side sheet and the non-skin-side sheet is preferably a stretchable sheet stretchable in the left-right direction, and in the end regions overlapping with both ends of the absorbent main body in the left-right direction in the overlapping region, the total area of the heat bonding portions provided per unit area is preferably different between the pants-type sanitary napkin having the first size and the pants-type sanitary napkin having the second size.

According to such a panty type sanitary napkin, if the area ratio of the heat-bonded portion in the end region is small, stretchability of the waistline portion is liable to act on the absorbent body, and a gap is less likely to occur between the absorbent body and the skin of the wearer. In addition, if the area ratio of the heat-bonded portion in the end portion region is large, excessive stretchability is difficult to act on the absorbent main body, and marks or offensive feeling of the elastic member on the skin of the wearer can be suppressed. Therefore, by making the area ratio of the heat-bonded portion in the end region different depending on the size of each sanitary napkin, it is possible to easily understand the difference in the fit of the absorbent main body and the difference in the side leakage difficulty by the appearance.

In this pants-type sanitary napkin, it is preferable that the larger the end regions are, the smaller the total area of the heat bonding portions provided per unit area is.

According to such a pants-type sanitary napkin, the stretchability of the waist portion can be easily exerted on the end regions by reducing the area ratio of the heat-bonded portions in the end regions. Therefore, even in the case of a large-sized sanitary napkin, both end portions of the absorbent main body are easily bonded to the buttocks of the wearer over a wide range, and the high bonding property can be easily understood by the external appearance.

In this pants-type sanitary napkin, the end region is preferably provided on the back side.

According to such a panty type sanitary napkin, by providing the end regions on the back side, it is difficult to generate gaps between the ends of the absorbent main body and the skin of the wearer over a wide range of buttocks during wearing, and it is easy to understand that the sanitary napkin has high fit by appearance.

In this pants-type sanitary napkin, it is preferable that the total area of the heat bonding portions provided per unit area in the end regions is equal to or smaller than the total area of the heat bonding portions provided per unit area in the regions located at the same position as the end regions in the up-down direction and located inside the end regions in the left-right direction.

According to such a panty type sanitary napkin, the area ratio of the heat-bonded portion is large inside the end region, and the waistline portion and the absorbent body are difficult to contract, so that the absorbent body is easily bonded to the body of the wearer in the form of a surface. On the other hand, in the end regions, the area ratio of the heat-bonded portions is small, and the waistline portion is easily stretched, so that both end portions of the absorbent main body are pressed against the body of the wearer, and side leakage of excrement and the like can be easily suppressed.

In this pants-type sanitary napkin, it is preferable that the total area of the heat bonding portions provided per unit area in the end regions is equal to or larger than the total area of the heat bonding portions provided per unit area in the regions located at the same position as the end regions in the up-down direction and located outside the end regions in the left-right direction.

According to such a panty type sanitary napkin, the waistline portion is easily prevented from being excessively stretched and contracted on both outer sides of the end regions as compared with the end regions. Therefore, the uniformity of the appearance shape between the sanitary napkins of different sizes is suppressed from being damaged. This makes the appearance of the sanitary napkin assembly neat, and can improve the fit according to the shape of the wearer's body.

In this pants-type sanitary napkin, it is preferable that a waist elastic member that is stretchable in the left-right direction is provided at an upper end portion of the waist portion, and a total area of the heat bonding portions provided per unit area in a region where the waist elastic member is provided in the non-overlapping region is different between the pants-type sanitary napkin having the first size and the pants-type sanitary napkin having the second size.

According to such a pants-type sanitary napkin, the area ratio of the heat-bonded portion is made different for each sanitary napkin at the upper end portions of the abdomen-side waistline portion and the back-side waistline portion, which are required to be reliably bonded to the waistline of the wearer when worn, and thus, the difference in the bonding property around the waistline due to the difference in the size of the sanitary napkin can be easily understood by the user from the external appearance.

In this pants-type sanitary napkin, it is preferable that, in the back-side waistline portion, in the region where the waistline elastic members are provided in the non-overlapping region, the total area of the heat-bonded portions provided per unit area is different between the pants-type sanitary napkin having the first size and the pants-type sanitary napkin having the second size.

According to such a pants-type sanitary napkin, since the size of the sanitary napkin at the back waistline portion increases due to the difference in size of the sanitary napkin, the area ratio of the heat-bonded portion in the region overlapping the waistline elastic member varies depending on the size of each sanitary napkin, and therefore it is easy to determine the fit to the bulge of the buttocks by the appearance also varies depending on the difference in size of the sanitary napkin.

In the pants-type sanitary napkin, it is preferable that the waist portion has a non-skin-side sheet made of a nonwoven fabric and a skin-side sheet made of a stretchable nonwoven fabric laminated on the skin side of the non-skin-side sheet, and when the waist portion is contracted in the left-right direction in a natural state, a non-skin-side convex portion in which the non-skin-side sheet is convex-deformed toward the non-skin side and a skin-side convex portion in which the skin-side sheet is convex-deformed toward the non-skin side are formed, and the pants-type sanitary napkin has a portion in which the skin side surface of the non-skin-side convex portion is in contact with the non-skin side surface of the skin-side convex portion.

According to such a pants-type sanitary napkin, the inside (skin side) of the wrinkles formed by the non-skin side protrusions of the non-skin side sheet is filled with the skin side protrusions of the skin side sheet. This stabilizes the shape of the wrinkles and makes it easy to visually recognize, so that the user can easily and intuitively understand the difference in fit due to the difference in size of the sanitary napkin.

In this pants-type sanitary napkin, it is preferable that the overlapping region has a high-area-ratio region having a total area of the heat bonding portions provided per unit area higher than that of the other regions, and the pants-type sanitary napkin has a portion having a width in the left-right direction smaller than that of the high-area-ratio region on the abdomen side than that of the high-area-ratio region on the back side.

According to such a pants-type sanitary napkin, the area ratio of the heat-bonded portion is narrowed in the back side compared to the abdomen side, and therefore the waistline portion and the absorbent main body are easily deformed. Therefore, the sanitary napkin can be easily and reliably attached even to the back side having a larger concavity and convexity than the abdomen side due to the bulge of the buttocks or the like.

In this pants-type sanitary napkin, it is preferable that the sanitary napkin has a portion in which the width in the lateral direction of the high-area-ratio region is smaller than the width in the lateral direction of the high-area-ratio region at the lower end in the vertical direction.

According to such a panty-type sanitary napkin, the rigidity is improved by increasing the area ratio of the heat-bonding portion as much as possible in the crotch portion at the lower end in the up-down direction, whereby the rigidity of the absorbent body is maintained high, and wrinkles of the absorbent body are easily suppressed even when the panty-type sanitary napkin is sandwiched between the legs of the wearer during wearing. On the other hand, since the back side has large irregularities due to swelling of the buttocks or the like as compared with the crotch portion, good fitting is easily achieved by making the waistline portion and the absorbent main body easy to deform.

In this pants-type sanitary napkin, it is preferable that the waistline portion has a portion constituted by one sheet member in the thickness direction, and the plurality of heat-bonding portions are also provided in the portion constituted by one sheet member.

According to such a pants-type sanitary napkin, by providing a plurality of heat-bonded portions in the portion of the waistline portion that is formed of one sheet member, the rigidity of the sheet member can be improved, and the leg hole opening can be easily and accurately cut in the manufacturing process of the sanitary napkin. This can improve the appearance of the sanitary napkin (the shape of the leg hole opening).

In this pants-type sanitary napkin, it is preferable that the absorbent main body has an absorber elastic member that stretches and contracts in the up-down direction, and that the ratio of the length of the stretchable portion on which the absorber elastic member acts to the length of the pants-type sanitary napkin from the upper end to the lower end in the up-down direction is different between the pants-type sanitary napkin having the first size and the pants-type sanitary napkin having the second size.

According to such a pants-type sanitary napkin, by adjusting the effective length of the absorber elastic member, the external dimensions of the absorbent main body can be easily integrated for each sanitary napkin of different dimensions, and the back leakage or the like that is actually caused by the absorbent main body can be easily suppressed.

Further, a shorts-type sanitary napkin set is disclosed, comprising a first shorts-type sanitary napkin having a first size and a second shorts-type sanitary napkin having a second size, wherein the first shorts-type sanitary napkin and the second shorts-type sanitary napkin have the same brand name and sub-brand name, the first shorts-type sanitary napkin and the second shorts-type sanitary napkin have a vertical direction and a horizontal direction intersecting each other, and the first shorts-type sanitary napkin and the second shorts-type sanitary napkin have: an absorbent body; and a waistline unit formed by joining together, at both end portions in the left-right direction, an abdomen-side waistline unit and a back-side waistline unit by means of a pair of side joining portions, wherein the waistline unit includes a skin-side sheet, a non-skin-side sheet, and a plurality of heat bonding portions for joining the skin-side sheet and the non-skin-side sheet, and wherein the waistline unit has stretchability in the left-right direction, and wherein the waistline unit includes an overlapping region where the absorbent body overlaps the waistline unit and a non-overlapping region where the absorbent body does not overlap the waistline unit, in a top view in an unfolded state, and wherein a total area of the heat bonding portions provided per unit area differs between the first pants-type sanitary napkin and the second pants-type sanitary napkin in either one of the overlapping region and the non-overlapping region.

According to such a pants-type sanitary napkin set, in a large-sized sanitary napkin, the area (area ratio) of the heat-bonding portion provided per unit area is set as small as possible, so that the waistline portion is easily deformed by the irregularities of the wearer's body, and a good fit is easily obtained. On the other hand, in a sanitary napkin having a small size, the irregularities of the wearer's body are small, so that good fitting properties of the waist section can be easily obtained even if the area ratio of the heat-bonded section is increased, and the deformed shape of the waist section can be easily maintained when fitting the body by increasing the area ratio of the heat-bonded section. Therefore, by changing the area ratio of the heat-bonding portion according to the difference in the size of the sanitary napkin, it is possible to easily understand the difference in the fit by the appearance.

= = embodiment= = = =

As an example of the pants-type absorbent article according to the embodiment of the present invention, a pants-type sanitary napkin 1 (hereinafter, also simply referred to as "sanitary napkin 1") will be described.

Basic structure of sanitary towel 1

Fig. 1 is a schematic perspective view of a sanitary napkin 1 according to the present embodiment. Fig. 2 is a plan view of the sanitary napkin 1 in an expanded and stretched state when viewed from the skin side in the thickness direction. Fig. 3 is a schematic cross-sectional view A-A of fig. 2.

The "extended state" of the sanitary napkin 1 is a state in which the respective elastic members (for example, the absorber elastic members 50, the skin-side sheets 22, 23, and the like described later) included in the sanitary napkin 1 are extended to extend the entire sanitary napkin 1 (the entire product) without wrinkles, specifically, a state in which the dimensions of the respective members (for example, the non-skin-side sheet 21, the skin-side sheets 22, 23, and the like described later) constituting the sanitary napkin 1 are extended to a dimension that matches or approximates the dimensions of the individual members.

As shown in fig. 1, the sanitary napkin 1 has "up-down direction", "left-right direction", and "front-back direction" which are orthogonal to each other. As shown in fig. 3, the laminated structure has a "thickness direction" which is a direction in which the respective members are laminated. One of the vertical directions, which is the body side of the wearer in the state where the wearer wears the sanitary napkin 1, is referred to as "upper side", and the other is referred to as "lower side". In addition, one of the front-rear directions, which is the abdomen side of the wearer when worn, is referred to as the "front side", and one of the back sides of the wearer is referred to as the "back side". In the thickness direction, the side that contacts the skin of the wearer in the state where the sanitary napkin 1 is worn by the wearer is referred to as the "skin side", and the opposite side is referred to as the "non-skin side".

In addition, the sanitary napkin 1 has mutually orthogonal "longitudinal" and "transverse" directions in the unfolded state shown in fig. 2. The "longitudinal direction" is a direction along the up-down direction in the pants-type, and the "transverse direction" is a direction along the left-right direction in the pants-type.

The sanitary napkin 1 of the present embodiment includes a liquid-absorbent main body 10 that absorbs liquid such as menstrual blood, and a waistline portion 20 that is disposed on the non-skin side of the absorbent main body 10 and that is disposed on the waistline of the wearer when the sanitary napkin 1 is worn.

(absorbent body 10)

Fig. 4 is a top view and a cross-sectional view of the absorbent body 10. As shown in fig. 2, the absorbent body 10 of the present embodiment has a substantially rectangular shape in a plan view along the vertical direction of the sanitary napkin 1 in the longitudinal direction (i.e., the longitudinal direction of the absorbent body 10). As shown in fig. 3 and 4, the absorbent body 10 includes: an absorbent core 11 in the longitudinal direction (up-down direction), a top sheet 12 disposed on the skin side with respect to the absorbent core 11, a second sheet 13 disposed between the top sheet 12 and the absorbent core 11, a back sheet 14 disposed on the non-skin side with respect to the absorbent core 11, and a side sheet 15 disposed on the non-skin side of the back sheet 14.

The absorbent core 11 is a member for absorbing and retaining a liquid such as menstrual blood, and is formed of a liquid-absorbent fiber such as pulp fiber mixed with a Super Absorbent Polymer (SAP), for example. The absorbent core 11 may be covered with a liquid-permeable sheet member (core wrap sheet) such as a tissue or a nonwoven fabric.

The top sheet 12 is a liquid-permeable sheet member that can contact the skin of the wearer when worn, and is formed of, for example, a hydrophilic hot air nonwoven fabric, a spunbond nonwoven fabric, or the like. In the present embodiment, as shown in the cross-sectional view of fig. 4, both lateral end portions of the top sheet 12 are folded back from the skin side to the non-skin side in the thickness direction on both lateral outer sides of the absorbent core 11, and sandwiched between the absorbent core 11 and the back sheet 14.

The second sheet 13 is a sheet member having substantially the same function and structure as the top sheet 12, and is laminated on the non-skin-side surface of the top sheet 12. In addition, the second sheet 13 is not necessarily provided in the absorbent main body 10.

The back sheet 14 is a sheet member having air permeability and liquid impermeability for suppressing leakage of liquid such as menstrual blood absorbed by the absorbent core 11 to the outside, and is formed of, for example, a resin film or the like.

The side sheet 15 is a sheet member laminated on the non-skin side of the back sheet 14, and is a hydrophobic nonwoven fabric such as an SMS (spunbond-meltblown-spunbond) nonwoven fabric. In the present embodiment, the side sheet 15 is formed with a pair of leakage preventing wall portions 30, 30.

A pair of leakage preventing wall portions 30 are provided on both sides of the absorbent main body 10 in the left-right direction, and the leakage preventing wall portions 30 are portions corresponding to so-called three-dimensional gathers. When the sanitary napkin 1 is worn, the leakage preventing wall portions 30 rise from both sides of the absorbent main body 10 in the lateral direction toward the skin side of the wearer, thereby preventing excreted liquid such as menstrual blood from leaking out of the absorbent main body 10.

In the present embodiment, as shown in the cross-sectional view of fig. 4, the side sheet 15 extends outward in the left-right direction (lateral direction) of the absorbent core 11, is bent toward the skin side in the thickness direction at both ends in the left-right direction of the absorbent main body 10, and the end portion 15t is disposed on the skin side compared to the absorbent core 11. As shown in fig. 4, at the end 15t, the side sheets 15 are folded back to be laminated in the thickness direction, and a leakage preventing wall elastic member 31 is provided between the laminated side sheets 15, 15. When the sanitary napkin 1 is worn, the end portion 15t of the leakage preventing wall portion 30 is contracted in the longitudinal direction (up-down direction) based on the stretchability exhibited by the leakage preventing wall elastic member 31, whereby the free end of the end portion 15t stands up toward the skin side of the wearer.

The absorbent body 10 is provided with a high-density portion 40 having a density of the absorbent core 11 higher than that of the surrounding portion. The high-density portion 40 is formed by pressing each member constituting the absorbent main body 10 in the thickness direction. As shown in fig. 4, the high-density portion 40 of the present embodiment includes a first high-density portion 41, a second high-density portion 42, and a third high-density portion 43, each of which is formed in a linear shape by a plurality of dot-like compressed portions arranged. By providing such a high-density portion 40, the liquid-absorbent fibers of the absorbent core 11 are suppressed from being dispersed and from being collapsed in shape. When the sanitary napkin 1 is worn, the high-density portion 40 serves as a starting point of bending, so that the absorbent core 11 is easily deformed three-dimensionally according to the shape of the wearer's body, and is easily fitted to the wearer's body.

The absorbent body 10 is provided with a plurality of absorber elastic members 50 that extend and retract in the longitudinal direction (up-down direction). The absorber elastic member 50 is formed of, for example, a rubber yarn, and is disposed in a state of being elongated in the longitudinal direction (up-down direction) at a position closer to the non-skin side (specifically, between the back sheet 14 and the side sheet 15) than the absorbent core 11. In the sanitary napkin 1 of the present embodiment, as shown in fig. 4, five absorber elastic members 50 are provided at predetermined intervals in the left-right direction. The expansion ratio of the absorber elastic member 50 is preferably about 2.7 to 3.2 times. The "stretch ratio" of the elastic member is a value obtained by dividing the length of the elastic member in the stretched state by the length of the elastic member in the natural state. By setting the expansion ratio of the absorber elastic member 50 to be higher than that of the leakage wall elastic member 31, the absorbent body 10 is easily contracted from the non-skin side in the thickness direction, and the absorbent body 10 can be easily fitted to the body of the wearer when the sanitary napkin 1 is worn. That is, the stretchability exhibited by the absorber elastic member 50 facilitates the absorbent main body 10 to be brought into close contact with the crotch of the wearer, and can make leakage of excreted liquid such as menstrual blood difficult.

(waistline portion 20)

The waistline portion 20 is made up of one or more sheet members, and in the present embodiment, the waistline portion 21 includes a non-skin-side sheet 21 and skin-side sheets 22 and 23 (see fig. 3). In the following description, a portion of the waist section 20 that is located on the front side (abdomen side) of the central position CL in the longitudinal direction is referred to as an abdomen-side waist section 20f, and a portion that is located on the rear side (back side) of the central position CL is referred to as a back-side waist section 20b.

The non-skin-side sheet 21 is a non-stretchable sheet member disposed on the most non-skin side of the sanitary napkin 1, and is formed of, for example, a spunbond nonwoven fabric, an SMS nonwoven fabric, or the like. In the present embodiment, as shown in the plan view of fig. 2, the non-skin-side sheet 21 has a shape in which the diameter is reduced inward in the left-right direction at the central portion (the portion including the central position CL) in the longitudinal direction.

The skin-side sheet 22 is a stretchable sheet member (stretchable sheet) laminated on the front side (abdomen side) in the longitudinal direction and the skin side of the non-skin-side sheet 21. The skin-side sheet 22 (stretchable sheet) is formed of, for example, stretchable nonwoven fabric. The "stretchable nonwoven fabric" is a nonwoven fabric that contains stretchable fibers having stretchability and stretchable fibers having lower stretchability than the stretchable fibers, and has been subjected to appropriate stretching such as gear stretching. In the skin-side sheet 22 of the present embodiment, as the stretchable fiber, a fiber of a polyurethane-based elastomer which is one type of thermoplastic elastomer having elasticity can be used, and as the stretchable fiber, a fiber of polypropylene (PP) which is a polyolefin-based resin which is one type of thermoplastic resin having inelasticity can be used.

The skin-side sheet 22 is joined to the non-skin-side sheet 21 by a plurality of heat-bonded portions 60 (see fig. 7) arranged in a predetermined pattern, whereby the abdomen-side waist area 20f is provided with stretchability at least in the left-right direction. In the present embodiment, the thermal bonding portion 60 is formed using a known bonding means such as ultrasonic thermal bonding. Details of the arrangement pattern of the heat bonding portion 60 will be described later.

The skin-side sheet 23 is a stretchable sheet member laminated on the skin side of the non-skin-side sheet 21 on the rear side (back side) in the longitudinal direction. The skin-side sheet 23 has the same structure as the skin-side sheet 22. That is, the skin-side sheet 23 is formed of stretchable nonwoven fabric, and is joined to the non-skin-side sheet 21 by a plurality of heat-bonded portions 60 (see fig. 6) that are dispersed. This imparts stretchability to the back waistline portion 20b at least in the left-right direction.

Further, rubber-filament isosceles-surrounding elastic members 25 are provided in the upper end portions of the abdomen-side waistline portion 20f and the back-side waistline portion 20b so as to be stretchable in the left-right direction. By providing such a waist elastic member 25, the fit at the waist opening 1b can be further improved, and misalignment of the waist portion 20 can be suppressed when the sanitary napkin 1 is worn. At least a part of the waist elastic member 25 is preferably arranged so as to overlap the skin-side sheets 22 and 23, respectively, when viewed in the thickness direction (see fig. 2 and 3). In this way, the stretchability in the left-right direction of the waist elastic member 25 is linked with the stretchability in the left-right direction of the skin-side sheets 22 and 235, and the fit of the sanitary napkin 1 at the waist of the wearer can be further improved.

From the unfolded state shown in fig. 2, the absorbent body 10 and the waistline portion 20 of the sanitary napkin 1 are folded in half in the longitudinal direction (front-rear direction) with the central position CL (indicated by a one-dot chain line in fig. 2) in the longitudinal direction of the absorbent body 10 as a folded position. In this folded state, the lateral side joint portions 20we are formed by joining the lateral (left-right direction) both end portions 20fe, 20fe of the abdomen-side waist portion 20f overlapped in the front-back direction and the lateral (left-right direction) both end portions 20be, 20be of the back-side waist portion 20b by a known joining means such as sealing welding. Thus, the folded waist portions 20 (20 f and 20 b) are connected in a loop shape on the front side (abdomen side) and the back side (back side), and form one waist opening 1a and a pair of leg hole openings 1b as shown in fig. 1, thereby forming a pants-type sanitary napkin 1.

The pants-type sanitary napkin 1 of the present embodiment is commercially available as a sanitary napkin set having various sizes. For example, in the sanitary napkin 1 in the extended and developed state shown in fig. 2, by appropriately changing the longitudinal length L1 and the transverse length W1, a plurality of types of sanitary napkins 1 such as S-code, M-code, L-code, and XL-code are formed according to the size of the body of the wearer. Moreover, these sanitary napkin sets having various sizes are circulated in the market by attaching the same brand name and sub-brand name.

The sanitary napkin 1 is distributed in the market as a package 100 (package) in which a plurality of sanitary napkins 1 having the same size are individually packaged. The package 100 is formed into a pouch shape as shown in fig. 5 by using a package material such as an SMS nonwoven fabric or a resin film, and accommodates therein a single or a plurality of pants-type sanitary napkins 1 in a folded state. At least a brand name 110, a sub-brand name 120, and a size mark 130 are displayed on the surface of the package 100. The brand name 110 is information indicating the brand of the sanitary napkin group including the sanitary napkin 1, for example, "sufei (registered trademark)", and the like. The sub-brand name 120 is information indicating names of different products within the same brand, such as "super-asleep" or the like. The size mark 130 is information indicating the size of the pants-type sanitary napkin 1, and for example, indicates the size of S, M, L, XL or the like.

In the package 100 of the pants-type sanitary napkin 1, the brand name 110 and the sub-brand name 120 are common to the pants-type sanitary napkins 1 of all sizes. On the other hand, the size mark 130 is different according to the size of the sanitary napkin 1. For example, in the package 100 of the pants-type sanitary napkin 1 of the L-size and the package 100 of the pants-type sanitary napkin 1 of the XL-size, the brand name 110 and the sub-brand name 120 are the same, although the size marks 130 are different. By visually recognizing such a package 100 at a store front or the like of a retail store, a user can select a desired product size without making mistakes with respect to a desired brand of pants-type sanitary napkin 1 (for example, "sufei", "ultra-deep sleep", etc.). The sanitary napkin is used by being attached to underpants according to the amount of menstrual blood, and the same brand of different length is used for daily use and night use, but the pants-type sanitary napkin of the present embodiment is used by being attached to a waistline. Therefore, it is important to be able to purchase a shorts type sanitary napkin 1 of a suitable size without any error.

In the conventional sanitary napkin having such various sizes, the basic structure and the external shape are common, and therefore, at first glance, it is difficult for the user to understand how the fit varies depending on the size difference of the sanitary napkins. For example, in absorbent articles such as pants-type sanitary napkins and general-purpose pants-type diapers having different sizes, the absorbent articles appear the same even if the stretch ratio of the elastic member (stretchable sheet or the like) is changed, and therefore, it is difficult for the user to grasp that the fit is different depending on the difference in size at first glance.

In the sanitary napkin 1 of the present embodiment, the arrangement pattern of the heat-bonding portions 60 is changed for each size, so that the difference in fit due to the difference in size can be easily understood by the appearance. The relationship between the thermal bonding portion 60 and the adhesion will be described below.

Relation between the size of the sanitary napkin 1 and the arrangement pattern of the heat-bonding portions 60

Fig. 6 is a plan view showing the arrangement of the pattern of the thermal bonding portion 60. In addition, fig. 6 shows a state in which the base sheet (the non-skin-side sheet 21 and the skin-side sheets 22 and 23) constituting the waist portion 20 is joined in the thickness direction by the heat-bonding portion 60 in the manufacturing process of the sanitary napkin 1. That is, fig. 6 shows the waistline portion 20 before cutting for forming the leg hole openings 1 b.

When the waist portion 20 (sanitary napkin 1) in the developed and extended state shown in fig. 6 is viewed in the thickness direction (plan view), the region where the absorbent body 10 overlaps the waist portion 20 is referred to as an overlapping region R1 (region inside the thick line in fig. 6), and the region where the absorbent body 10 does not overlap the waist portion 20 is referred to as a non-overlapping region R2 (region outside the thick line in fig. 6). Furthermore, the sanitary napkin 1 is divided into three regions A, B, C. In fig. 6, a diagonally hatched portion in the non-overlapping region R2 is taken as a region a. In addition, cross hatching portions overlapping both ends in the left-right direction of the absorbent main body 10 in the overlapping region R1 are defined as a region C (hereinafter, the region C is also referred to as an "end region"). In the sanitary napkin 1, the portion other than the regions a and C (end regions) is referred to as a region B.

Fig. 7A is a table showing the relationship between the size of the sanitary napkin 1 and the arrangement pattern of the heat bonding portions 60 provided in the regions a to C of fig. 6. In fig. 7A, three dimensions M, L, XL are illustrated, but other dimensions (e.g., S) may be used. Fig. 7B shows three arrangement patterns of the heat bonding portion 60 formed in the sanitary napkin 1. Patterns 1 to 3 of fig. 7B are each formed by intermittently arranging a plurality of thermal bonding portions 60. In each pattern, the thermal bonding portion 60 is different in size and shape. Therefore, in these three modes, the total area (hereinafter also referred to as "area ratio") of the thermal bonding portions 60 provided per unit area is different. Specifically, the area ratio of pattern 1 among the three patterns is largest, the area ratio of pattern 2 is smaller than pattern 1, and the area ratio of pattern 3 is smaller than pattern 2.

In the sanitary napkin 1, the arrangement pattern of the heat bonding portions 60 is changed for each of the dimensions M to LX in at least any one of the region C (overlapping region R1) and the region a (non-overlapping region R2) of fig. 6. In other words, the total area (area ratio) of the thermal bonding portions 60 provided per unit area in the region C or the region a of the sanitary napkin 1 of a certain size is different from the total area (area ratio) of the thermal bonding portions 60 provided per unit area in the region C or the region a of the sanitary napkin 1 of another size.

For example, the thermal bonding portion 60 of the pattern 2 is provided in the region a of the L-size sanitary napkin 1, whereas the thermal bonding portion 60 of the pattern 3 is provided in the region a of the XL-size sanitary napkin 1 (see fig. 7A). That is, the area ratio of the thermal bonding portion 60 in the region a of the sanitary napkin 1 of the XL code is smaller than the area ratio of the thermal bonding portion 60 in the region a of the sanitary napkin 1 of the L code. The region a in the waistline portion 20 is a portion that does not overlap the absorbent main body 10 and is easily in direct contact with the skin of the wearer when worn. Further, the smaller the area ratio of the heat-bonded portion 60 provided in the waistline portion 20, the smaller the ratio of joining the non-skin-side sheet 21 and the skin-side sheets 22, 23, and therefore, the lower the rigidity of the waistline portion 20, the more likely it is to deform and to be fitted to the body of the wearer.

In the sanitary napkin 1 of the XL size, the area ratio of the heat-bonded portion 60 in the region a is set as small as possible (pattern 3), whereby the waistline portion 20 can be easily deformed by large irregularities of the wearer's body. Thus, even the sanitary napkin 1 having a large area covering the skin of the wearer can achieve good fitting properties. On the other hand, in the sanitary napkin 1 of the L-size (M-size), the covered area is smaller and the irregularities of the wearer's body are smaller than in the XL-size, so that even if the area ratio (pattern 2) of the heat-bonded portion 60 is increased, the good fitting property of the waistline portion 20 is easily maintained. Further, by increasing the area ratio of the heat-bonding portion 60, the deformed shape of the waist portion 20 when attached to the body can be easily maintained.

Thus, good fitting properties can be achieved for each sanitary napkin 1 of different sizes. Further, by making the pattern of the heat bonding portion 60 different for each different size, the user can visually recognize that the fitting properties of the sanitary napkin 1 are different. That is, the difference in fit due to the difference in size of the sanitary napkin 1 can be easily understood by the appearance.

Further, since the waistline portion 20 of the sanitary napkin 1 has stretchability in the left-right direction, when it is contracted in the left-right direction in a natural state, a plurality of wrinkles are formed on the front surface. Further, since such wrinkles are formed more easily as the waistline portion 20 becomes softer and more easily deformed, the shape and size of the wrinkles formed in the waistline portion 20 can be made different by making the area ratio of the heat-bonding portion 60 different according to the size of the sanitary napkin 1. Further, the user can visually recognize such wrinkles, and can intuitively understand the difference in fit due to the difference in size of the sanitary napkin 1.

The "natural state" refers to a state in which the sanitary napkin 1 is left for a predetermined period of time. For example, after taking out the sanitary napkin 1 in the product state from the package, the abdomen-side waistline portion 20f and the back-side waistline portion 20b are stretched to the left and right sides, the waistline portion 20 is set to an "extended state", and after the extended state is continued for 15 seconds, the stretching of the sanitary napkin 1 is released, and the sanitary napkin is placed on a flat surface such as a table. Then, the state of the flat surface after 5 minutes had passed was set as a natural state.

In the region C (end region) of the sanitary napkin 1 (waistline portion 20), the total area (area ratio) of the heat-bonded portions 60 provided per unit area is also different depending on the size of the sanitary napkin. The region C (end region) is a portion of the overlapping region R1 located at a position on both lateral sides of the back side of the absorbent main body 10 in the lateral direction (see fig. 6), and is a portion that is disposed along the buttocks of the wearer when the sanitary napkin 1 is worn. Therefore, if a gap is formed between the absorbent main body 10 and the skin of the wearer in the region C, side leakage of excrement and deterioration of fit are likely to occur.

In particular, in a large sanitary napkin such as the XL-size, the gap between the skin of the wearer of the absorbent main body 10 tends to be larger than in a small-size sanitary napkin.

In the present embodiment, the area ratio of the thermal bonding portion 60 in the region C (end region) is made different according to the sanitary napkin size. For example, if the area ratio of the heat-bonded portion 60 is small, the waistline portion 20 is easily deformed in this region C, and stretchability due to the skin-side sheet 23 (stretchable sheet) is easily exerted on the absorbent body 10. As a result, the absorbent body 10 is easily pressed against the skin of the wearer, and a gap is less likely to occur between the absorbent body 10 and the skin. In contrast, if the area ratio of the heat bonding portion 60 is large, excessive stretchability is hardly applied to the region C, and marks of the elastic member on the skin of the wearer can be suppressed, and generation of an uncomfortable feeling on the skin of the wearer can be suppressed. By doing so, the difference in fit and the difference in side leakage difficulty at the two side portions of the absorbent main body 10 can be easily understood by the appearance according to the size of the area ratio of the heat bonding portion 60.

As shown in fig. 7, in the sanitary napkin 1 of the present embodiment, the larger the sanitary napkin size, the smaller the area ratio of the heat bonding portion 60 in the region C (end region). As a result, the larger the size of the sanitary napkin, the more easily the stretchability of the skin-side sheet 23 (stretchable sheet) is exerted in the region C, and the more difficult the gap is to be generated between the absorbent main body 10 and the skin of the wearer. Therefore, the both side portions of the absorbent main body 10 are easily bonded to the buttocks of the wearer over a wide range, and side leakage of excrement such as feces is suppressed, and the high bonding property is easily understood by the external appearance. On the other hand, in a sanitary napkin of small size, the gap generated between the absorbent main body 10 and the skin of the wearer is originally small, and therefore, it is easy to achieve good fitting properties even if the area ratio of the heat bonding portion 60 in the region C is increased as compared with a sanitary napkin of large size, and it is easy to understand that excessive stretchability is difficult to act in a narrow range by appearance.

In the sanitary napkin 1, a region C (end region) is provided on the back side in the longitudinal direction (up-down direction) of the absorbent main body. As described above, the region C (end region) is a portion located at the buttocks, which has a large area and is likely to generate a gap with the absorbent main body 10 when the sanitary napkin 1 is worn. Therefore, by providing the region C on the back side, it is difficult to generate a gap between the two side portions of the absorbent main body 10 and the skin of the wearer over a wide range of buttocks, and it is easy to understand that the high fitting performance is provided by the external appearance.

The area ratio of the heat-bonding portion 60 provided in the region C (end region) in the overlapping region R1 of the sanitary napkin 1 is equal to or smaller than the area ratio of the heat-bonding portion 60 provided in a portion (a part of the region B) located at the same position as the region C (end region) in the up-down direction (longitudinal direction) and located inside the region C (end region) in the left-right direction (transverse direction). That is, in the sanitary napkin 1, the stretchability of the waistline portion 20 in the region C overlapping both side portions of the absorbent main body 10 is equal to or greater than the stretchability of the waistline portion 20 in the region B sandwiched by the regions C. Therefore, on the back side of the sanitary napkin 1, the waistline portion 20 is less likely to stretch and contract and the absorbent body 10 is less likely to contract at the center portion in the lateral direction of the overlapping region R1, and therefore the absorbent body 10 is likely to be fitted to the body of the wearer in a planar fashion. On the other hand, the waist portion 20 is easily stretched and contracted at both lateral sides of the overlapping region R1 in the lateral direction, and the absorbent main body 10 is pressed against the body of the wearer, so that side leakage of excrement and the like can be easily suppressed.

The area ratio of the thermal bonding portion 60 provided in the region C (end region) is equal to or greater than the area ratio of the thermal bonding portion 60 located at the same position as the region C (end region) in the up-down direction (longitudinal direction) and located outside the region C (end region) in the left-right direction (transverse direction) (a part of the region a). That is, in the sanitary napkin 1, the stretchability of the waistline portion 20 in the region C overlapping both side portions of the absorbent main body 10 is equal to or less than the stretchability of the waistline portion 20 in the region a adjacent to both outer sides of the region C. Therefore, excessive expansion and contraction of the waist regions 20 on both outer sides of the region C are easily suppressed. In particular, in the large-sized XL codes and L codes, since the stretchability is the same in the region a and the region C (the pattern of the heat-bonding portion 60 is the same), the waistline portion 20 is less likely to excessively stretch and the uniformity of the external shape between different sized sanitary napkins is suppressed from being impaired. This enables a sanitary napkin to be formed which has a neat appearance and which has improved fit according to the shape of the wearer's body.

In addition, in the overlapping region R1, the width in the left-right direction of the portion where the area ratio of the thermal bonding portion 60 is high is preferably smaller on the back side than on the abdomen side. In the sanitary napkin 1 of the present embodiment, the area ratio of the heat bonding portion 60 is higher in the region B in the overlap region R1 than in the other regions (pattern 1). As shown in fig. 6, when the region B having a high area ratio is used as the high area ratio region, the region B has a portion where the width WR1B in the lateral direction of the high area ratio region (region B) on the back side is smaller than the width WR1f in the lateral direction of the high area ratio region (region B) on the abdomen side (WR 1f > WR 1B). In the portion where such a relationship is established, the portion where the area ratio of the heat-bonded portion 60 is high is narrower on the back side than on the abdomen side, and therefore, the waistline portion 20 and the absorbent main body 10 are easily deformed. Therefore, the sanitary napkin 1 can be easily and reliably attached to the back side, which has larger irregularities than the abdomen side due to swelling of the buttocks, or the like.

Further, in the overlapping region R1, the width in the lateral direction of the portion where the area ratio of the back-side heat-bonding portion 60 is high is preferably smaller than that of the crotch portion (the lower end portion in the up-down direction). As shown in fig. 6, the sanitary napkin 1 of the present embodiment has a portion (WR 1c > WR 1B) where the width WR1B of the high-area-ratio region (region B) on the back side becomes smaller than the width WR1c of the high-area-ratio region (region B) on the right and left sides of the central position CL (lower end position in the up-down direction) in the longitudinal direction. The crotch portion at the lower end in the up-down direction is a portion where the absorbent main body 10 is compressed in the left-right direction and is easily creased when the sanitary napkin 1 is worn by being sandwiched between the legs of the wearer. Therefore, it is preferable that the rigidity is easily maintained in the crotch portion by increasing the area ratio of the heat-seal portion 60 as much as possible. On the other hand, since the back side has larger irregularities due to the above-described bulge of the buttocks or the like as compared with the crotch portion, it is preferable to reduce the area ratio of the heat-bonding portion 60 and to easily deform the waistline portion 20 and the absorbent main body 10. By doing so, it is possible to achieve a good fit to the irregularities of the body and to suppress creasing of the absorbent body 10 in the crotch portion.

The heat bonding portion 60 is basically formed to join the non-skin-side sheet 21 and the skin-side sheets 22 and 23 stacked in the thickness direction. However, the thermal bonding portion 60 may be formed at a portion where the sheet members are not laminated in the thickness direction. In the sanitary napkin 1, the heat-bonding portion 60 is also disposed in the portion of the region B in the non-overlapping region R2 in fig. 6, that is, in the region where only one non-skin-side sheet 21 is provided in the thickness direction. Since the portion of the waist portion 20 formed of only one sheet member (the non-skin-side sheet 21) has low rigidity and is easily deformed, it may be difficult to cut the sheet member accurately when cutting the sheet member to form the leg hole openings 1b in the manufacturing process of the sanitary napkin 1. In contrast, by forming a pattern of a plurality of heat bonding portions 60 in a portion of one sheet member, the rigidity of the sheet member is improved, and the leg hole openings 1b can be easily and accurately cut. This can improve the appearance of the sanitary napkin 1 (the shape of the leg hole opening b 1). Further, since the appearance of the absorbent body when the absorbent elastic member 50 is contracted in the longitudinal direction can be improved and the size of the leg hole openings b1 varies depending on the size, even if the shape of the wrinkles formed by contraction of one sheet portion (the non-skin-side sheet 21) located in the leg hole openings b1 when contracted in the longitudinal direction by the absorbent elastic member 50 varies depending on the size, the difference in size can be recognized.

In the sanitary napkin 1 of the present embodiment, the length of the portion of the absorber elastic member 50 provided in the absorbent main body 10 that exhibits stretchability (hereinafter also referred to as "effective length") varies depending on the size of each sanitary napkin 1. Specifically, the effective length of the absorber elastic member 50 from the upper end to the lower end (so-called crotch size) with respect to the up-down direction of the sanitary napkin 1 varies depending on each size. For example, in fig. 2, the effective length L50 of the absorber elastic member 50 is appropriately adjusted according to the length of the crotch dimension (l1×1/2) of the sanitary napkin 1. If the effective length of the absorber elastic member 50 is the same in the sanitary napkin 1 of all the sizes, there is a concern that: the proportion of the absorbent main body 10 occupied by the crotch portion of the sanitary napkin 1 varies from one size to another, and the balance of the appearance is deteriorated, or the absorption performance of the absorbent main body 10 is deteriorated to cause leakage of excrement. In contrast, in the present embodiment, by adjusting the effective length of the absorber elastic member 50, the proportion of the absorbent main body 10 to each sanitary napkin 1 of different sizes can be easily integrated, and leakage of excrement actually occurring in the absorbent main body 10 can be suppressed.

In the sanitary napkin 1, the shape of the gathers formed on the surface of the waistline portion 20 is made difficult to deform, so that the user can easily recognize that the gathers are formed differently for each size. Fig. 8 is a diagram illustrating wrinkles formed on the surface of the waistline portion 20 of the sanitary napkin 1. Fig. 8A is a schematic cross-sectional view of the waistline portion 20 in an extended state, and fig. 8B is a schematic cross-sectional view of the waistline portion 20 in a contracted and wrinkled state.

The waistline portion 20 has a double-layer structure in which skin-side sheets 22 and 23 made of stretchable nonwoven fabric (stretchable sheet) are laminated on the skin side of a non-skin-side sheet 21 made of nonwoven fabric. When the waist portion 20 is in an extended state, the laminated sheet members as shown in fig. 8A are all planar. When the waist portion 20 is contracted in the left-right direction from this state based on the contraction force of the stretchable sheets (skin-side sheets 22, 23), a part of the non-skin-side sheet 21 forms a non-skin-side convex portion 21c that is convexly deformed toward the non-skin side in the thickness direction. The non-skin-side convex portion 21c forms a fold of the waistline portion 20. Further, the skin-side sheet 22 (23) (stretchable nonwoven fabric) contains stretchable fibers having low contractility, but the stretchable fibers are less likely to contract in the left-right direction, and therefore, a part of the skin-side sheet 22 (23) is deformed to protrude toward the non-skin side in the thickness direction in the same manner as the non-skin-side sheet 21, thereby forming the skin-side protrusions 22c (23 c).

As shown in fig. 8B, the non-skin-side surfaces of the skin-side protrusions 22c (23 c) of the skin-side sheet 22 (23) overlap with each other so as to contact the skin-side surfaces of the non-skin-side protrusions 21c of the non-skin-side sheet 21. That is, the inner side (skin side) of the non-skin side convex portion 21c of the non-skin side sheet 21 is filled with the skin side convex portion 22c (23 c) of the skin side sheet 22 (23). This makes it easy for the user to visually recognize the wrinkles because the shape of the wrinkles is stabilized, and thus easily and intuitively understand the difference in fit due to the difference in size of the sanitary napkin 1.

In fig. 6, the sanitary napkin 1 is divided into three regions a to C, and the arrangement pattern of the heat bonding portions 60 provided in the regions is changed according to the size of each sanitary napkin 1, but the arrangement pattern of the heat bonding portions 60 may be changed in other regions than a to C. For example, the arrangement pattern of the heat bonding portions 60 may be varied depending on the size of each sanitary napkin 1 in the region overlapping with the waist elastic members 25 provided at the upper ends of the abdomen-side waist portion 20f and the back-side waist portion 20 b. In other words, in the non-overlapping region R2 of the waistline portion 20, the area ratio of the thermal bonding portion 60 provided per unit area of the portion overlapping the waistline elastic member 25 may be different depending on the size of each sanitary napkin 1. The upper end portions of the abdomen-side waistline portion 20f and the back-side waistline portion 20b are portions that need to be reliably attached to the waistline of the wearer when the sanitary napkin 1 is worn. Therefore, in this portion, by making the area ratio of the heat bonding portion 60 different according to the size of each sanitary napkin 1, it is easy for the user to understand from the appearance that the fitting property varies around the waistline due to the difference in the size of the sanitary napkins 1.

In particular, in the back-side waistline portion 20b, since the size of the sanitary napkin 1 varies, the size of the bulge of the buttocks of the wearer increases, and therefore, it is necessary to reliably attach the back-side waistline portion 20b to the bulge of the buttocks. For this reason, it is more preferable that the area ratio of the heat bonding portion 60 is made different depending on the size of each sanitary napkin 1 in the region overlapping with the waist elastic member 25 provided at the upper end portion of the back side waist portion 20 b. This makes it easy to determine from the appearance that the fit against the bulge of the buttocks varies depending on the difference in size of the sanitary napkin 1.

The division of the regions of the waist portion 20 may be different from the division shown in fig. 6. For example, the region a of fig. 6 may be further divided into a central portion in the lateral direction as a region A1 and both end portions as a region A2, and the arrangement pattern of the heat bonding portions 60 in the regions A1 and A2 may be made different depending on the size of each sanitary napkin 1. In this way, the area ratio of the heat bonding portion 60 provided at the portion to be adjusted in the fit can be set more finely in the overlapping region R1 and the non-overlapping region R2 of the sanitary napkin 1.

In the sanitary napkin 1 of the present embodiment, the length of the absorbent main body 10 in the longitudinal direction (up-down direction) of fig. 2 is preferably longer on the back side (rear side) than on the abdomen side (front side). That is, it is preferable that the length of the absorbent body 10 on the rear side of the center position CL is longer than the length of the absorbent body 10 on the front side of the center position CL in the longitudinal direction. When wearing the sanitary napkin 1, the wearer is in a sitting position or a supine position for a long period of time, and menstrual blood and the like easily flow to the back side (rear side). Accordingly, by disposing the absorbent body 10 so as to be offset toward the back side (rear side) from the center position CL in the longitudinal direction, the area of the absorbent body 10 on the back side becomes large, and rearward leakage of menstrual blood or the like can be easily suppressed.

Also, it is preferable that the length (effective length) of the portion of the absorber elastic member 50 exhibiting stretchability in the longitudinal direction (up-down direction) of fig. 2 is longer on the back side (rear side) than on the abdomen side (front side). That is, it is preferable that the effective length of the absorber elastic member 50 on the rear side of the center position CL is longer than the effective length of the absorber elastic member 50 on the front side of the center position CL in the longitudinal direction. In the back side region, the grooves of the buttocks of the wearer extend long in the longitudinal direction, and therefore, in order to suppress back leakage of excrement, it is necessary to improve the fit of the absorbent main body 10 on the buttocks side. Therefore, by extending the effective length of the absorber elastic member 50 on the rear side, the range in which the expansion and contraction force acts on the absorbent body 10 is widened, and thereby the absorbent body 10 can be easily brought into close contact with the skin (buttocks) of the wearer. On the other hand, in the abdomen-side region, the body shape of the wearer is flat as compared with the back-side region, and therefore, even if the effective length of the absorber elastic member 50 is shortened to narrow the range in which the contractile force acts, it is difficult for a drainage leak or the like to occur, and it is also possible to make it difficult for an excessive tightening force to act on the abdomen-side of the wearer.

= = other= =

The above-described embodiments are for easy understanding of the present invention, and are not intended to limit the present invention. The present invention is not limited to the above-described embodiments, but may be modified and improved without departing from the spirit thereof.

In the above-described embodiment, the shorts-type sanitary napkin 1 has been described as an example of the shorts-type absorbent article, but the present invention can be applied to absorbent articles other than sanitary napkins. For example, the pants-type absorbent article may be a pants-type (pants-type) diaper for children or adults, a pants-type (pants-type) absorbent pad, or the like.

In the above-described embodiment, stretchability in the left-right direction is imparted to the waistline portion 20 by using the skin-side sheets 22, 23 of the waistline portion 20 as stretchable sheets (stretchable nonwoven fabrics), but elastic members other than stretchable sheets may be used to impart stretchability to the waistline portion 20. For example, stretchability may be imparted to the waist portion 20 by providing a plurality of linear elastic members 26 such as rubber threads as described below.

Fig. 9A and 9B are views for explaining a method of attaching the linear elastic member 26 to the waist unit 20 by the pair of heat-bonded portions 60. When the linear elastic member 26 is attached by the pair of heat bonding portions 60, a pair of heat bonding portions 61 and 62 adjacent to each other in the vertical direction (longitudinal direction) is used as a pair of heat bonding portions 60s, and the heat bonding portions 60s are disposed so as to sandwich the linear elastic member 26 from both sides in the vertical direction, thereby adjusting the interval between the heat bonding portions 61 and 62 in the vertical direction.

In the example of fig. 9A, a pair of thermal bonding portions 61 and 62 forming a thermal bonding portion pair 60s are arranged with a gap GH60 therebetween in the vertical direction. The size of the gap GH60 is set to be the same as or slightly larger than the diameter d26t of the linear elastic member 26 stretched to a predetermined stretch ratio (GH 60. Gtoreq.d26t). That is, the linear elastic member 26 in an extended state is arranged between the pair of thermally bonded portions 60S in the up-down direction. The interval between the two pairs of heat-bonded portions 60s, 60s adjacent to each other in the vertical direction may be larger than GH 60. That is, in the thermal bonding portions 60 arranged in the respective modes shown in fig. 7B, the vertical interval GH60 may be adjusted only for the pair of thermal bonding portions 60, 60 (the pair of thermal bonding portions 60 s) arranged at the position sandwiching the linear elastic member 26.

As shown in fig. 9B, when the linear elastic member 26 is relaxed from the extended state, the linear elastic member 26 contracts in the left-right direction and expands in the up-down direction, and the diameter d26 in the natural state is larger than the up-down distance GH60 between the pair of thermal bonding portions 60S (d 26 > GH 60).

That is, the linear elastic member 26 is sandwiched in the up-down direction by the heat bonding portions 61 and 62. As a result, the linear elastic member 26 is attached to the waistline portion 20.

Even when stretchability is imparted to the waistline portion 20 in this way, as described above, the arrangement pattern of the heat-bonding portions 60 and the shape of the wrinkles formed on the surface of the waistline portion 20 are changed at positions on the inner side in the lateral direction than the pair of side joint portions 20we, depending on the size of each sanitary napkin 1, and thus the fit is easily distinguished by the appearance and varies depending on the difference in size.

Symbol description

1 sanitary towel (pants-type sanitary towel, absorbent article), sanitary towel,

1a waistline opening, 1b leg circumference opening,

10 an absorbent body,

11 absorbent core, 12 top sheet, 13 second sheet, 14 back sheet, 15 side sheet, 15t end portion, 20 waist portion,

20f abdomen side waistline portion, 20fe end portion,

20b back side waistline portion, 20be end portion,

20we side joint part,

21 non-skin side sheet, 21c non-skin side convex portion,

22 skin side sheet (stretchable sheet), 22c skin side convex part,

23 skin side sheet (stretchable sheet), 23c skin side convex part,

25 waistline elastic parts,

26 linear elastic members,

30 leakage-proof wall parts,

31 wall-leakage elastic part,

40 high density portion,

41 first high-density portion, 42 second high-density portion, 43 third high-density portion, 50 absorber elastic member,

60 thermal bonding parts, 60s thermal bonding part pairs,

61 thermal bonding portions, 62 thermal bonding portions,

100 packages body,

110 brand name, 120 sub-brand name, 130 size label, R1 overlap region,

R2 non-overlapping region,

CL center position (fold line).

Claims

1. A pants-type sanitary napkin having a top-bottom direction and a left-right direction intersecting each other, and having an absorptive body and a waistline portion, the waistline portion being formed by joining together at both end portions in the left-right direction an abdomen-side waistline portion and a back-side waistline portion by a pair of side joining portions,

the pant-type sanitary napkin has a first dimension,

it is characterized in that the method comprises the steps of,

the waistline portion has a skin-side sheet, a non-skin-side sheet, and a plurality of heat-bonded portions that join the skin-side sheet and the non-skin-side sheet, and the waistline portion has stretchability in the left-right direction,

in a planar view in an expanded state, the pair of side joint portions are located inward in the lateral direction, and each of the pair of side joint portions has an overlapping region where the absorbent main body overlaps the waistline portion and a non-overlapping region where the absorbent main body does not overlap the waistline portion,

in either one of the overlapping region and the non-overlapping region, the total area of the heat bonding portions provided per unit area is different from the area in the other pants-type sanitary napkins having the same brand name and sub-brand name as those of the pants-type sanitary napkins and having the second size.

2. The pant-type sanitary napkin according to claim 1, wherein the absorbent pad comprises,

at least one of the skin-side sheet and the non-skin-side sheet is a stretchable sheet stretchable in the left-right direction,

in the end regions overlapping with the both ends of the absorbent main body in the lateral direction, the total area of the heat bonding portions provided per unit area is different between the pants-type sanitary napkin having the first size and the pants-type sanitary napkin having the second size.

3. A panty type sanitary napkin as claimed in claim 2, wherein,

the larger the size of the sanitary napkin in the end region, the smaller the total area of the heat bonding portions provided per unit area.

4. A panty type sanitary napkin as claimed in claim 3, wherein,

the end region is disposed on the back side.

5. The pant-type sanitary napkin according to any of claims 2-4, wherein the absorbent pad comprises,

the total area of the thermal bonding portions provided per unit area in the end regions is equal to or smaller than the total area of the thermal bonding portions provided per unit area in a region located at the same position as the end regions in the up-down direction and located inside the end regions in the left-right direction.

6. The pant-type sanitary napkin according to any of claims 2-5,

the total area of the thermal bonding portions provided per unit area in the end regions is equal to or larger than the total area of the thermal bonding portions provided per unit area in a region located at the same position as the end regions in the up-down direction and located outside the end regions in the left-right direction.

7. The pant-type sanitary napkin according to any of claims 1-6, wherein the absorbent pad comprises,

a waistline elastic member which can extend and retract in the left-right direction is arranged at the upper end part of the waistline part,

in the region in which the waist elastic members are provided in the non-overlapped region, the total area of the heat bonding portions provided per unit area is different between the pants-type sanitary napkin having the first size and the pants-type sanitary napkin having the second size.

8. The pant-type sanitary napkin according to claim 7, wherein the absorbent pad comprises,

in the back-side waistline portion,

9. The pant-type sanitary napkin according to any of claims 1-8, wherein the absorbent pad comprises,

the waistline portion has a non-skin-side sheet made of a nonwoven fabric and a skin-side sheet made of a stretchable nonwoven fabric laminated on the skin side of the non-skin-side sheet,

when the waist portion is contracted in the left-right direction in a natural state, a non-skin-side convex portion which is convex-deformed toward the non-skin side of the non-skin-side sheet and a skin-side convex portion which is convex-deformed toward the non-skin side of the skin-side sheet are formed,

the pants-type sanitary napkin has a portion where the skin side surface of the non-skin side convex portion contacts the non-skin side surface of the skin side convex portion.

10. The pant-type sanitary napkin according to any of claims 1-9, wherein the absorbent pad comprises,

the overlapping region has a high area ratio region in which the total area of the heat bonding portions provided per unit area is higher than that of the other regions,

the pants-type sanitary napkin has a portion in which the width in the lateral direction of the high-area-ratio region on the back side is smaller than the width in the lateral direction of the high-area-ratio region on the abdomen side.

11. The pant-type sanitary napkin according to claim 10, wherein the absorbent pad comprises,

The high-area-ratio region has a portion in which the width in the left-right direction of the high-area-ratio region is smaller than the width in the left-right direction of the high-area-ratio region at the lower end in the up-down direction.

12. The pant-type sanitary napkin according to any of claims 1-11,

the waistline portion has a portion constituted by one sheet member in the thickness direction, and the plurality of heat bonding portions are also provided in the portion constituted by one sheet member.

13. The pant-type sanitary napkin according to any of claims 1-12, wherein the absorbent pad comprises,

the absorbent body has an absorber elastic member that stretches and contracts in the up-down direction,

the ratio of the length of the portion on which the stretchability of the absorber elastic member acts to the length from the upper end to the lower end in the up-down direction of the pants-type sanitary napkin is different between the pants-type sanitary napkin having the first size and the pants-type sanitary napkin having the second size.

14. A pair of pants-type sanitary napkins comprises a first pants-type sanitary napkin having a first size and a second pants-type sanitary napkin having a second size,

It is characterized in that the method comprises the steps of,

the first and second panty type sanitary napkins have the same brand name and sub-brand name respectively,

the first pants-type sanitary napkin and the second pants-type sanitary napkin have an up-down direction and a left-right direction intersecting each other,

the first pants-type sanitary napkin and the second pants-type sanitary napkin each have:

an absorbent body; and

a waistline portion formed by joining an abdomen-side waistline portion and a back-side waistline portion to each other at both end portions in the left-right direction by a pair of side joining portions,

in either one of the overlapping region and the non-overlapping region, the total area of the heat bonding portions provided per unit area is different between the first pants-type sanitary napkin and the second pants-type sanitary napkin.