JP2023130512A - Shorts-type napkin - Google Patents

Abstract

To provide a shorts-type napkin that hardly gives discomfort to a wearer while improving fit.SOLUTION: An absorbent body includes: a first absorbent elastic member (51) provided on the non-skin side of a liquid impermeable film (14) and overlapping an absorbent core (11) when viewed in a thickness direction; and a second absorbent elastic member (52) arranged laterally outside the first absorbent elastic member (51) and not overlapping the absorbent core (11) when viewed in the thickness direction, wherein when viewed on the skin side and in the thickness direction from the liquid impermeable film (14), a portion not overlapping the absorbent core (11) is not provided with an elastic member which requires greater force to be elongated by a unit length in the longitudinal direction than the second absorbent elastic member (52), and the absorbent body has a body joint portion that joins the absorbent body and the girth member. The second absorbent elastic member located at the most one side in the transverse direction and the second absorbent elastic member located at the most other side have an overlapping portion with the body joint portion when viewed in the thickness direction.SELECTED DRAWING: Figure 7

Description

The present invention relates to a shorts-type napkin.

BACKGROUND ART Conventionally, shorts-type napkins having an absorbent body and a waist member are provided with an elastic member that expands and contracts along the longitudinal direction (vertical direction) of the absorbent body. For example, in Patent Document 1, a central elastic body 28 and a flap elastic body 22 are provided along the longitudinal direction of the absorbent body 6, and the elasticity exhibited by the elastic body allows the absorbent body 6 to adhere tightly to the wearer's body. A pant-type disposable absorbent article with enhanced properties is disclosed.

JP2018-61605A

In the pants-type absorbent article of Patent Document 1, the absorbent body 6 is pressed from the non-skin side to the skin side by the central elastic body 28 to fit the wearer's crotch area. Moreover, the three-dimensional gathers 23 are made to stand up by the flap elastic body 22, thereby preventing the lateral leakage of excretory fluid. However, when an elastic member with a strong stretching force is provided in a position close to the wearer's skin, as in the flap elastic body 22 of Patent Document 1, the elastic member may bite into the wearer's body, etc. may cause discomfort.

The present invention has been made in view of the above-mentioned problems, and its purpose is to provide a shorts-type napkin that does not cause discomfort to the wearer while improving the fit of the absorbent body. There is a particular thing.

The main invention for achieving the above object includes an absorbent core having a vertical direction, a horizontal direction, and a thickness direction that intersect with each other in the unfolded state, and having a liquid absorbent core and a liquid absorbent core provided on the non-skin side of the absorbent core. A shorts-type napkin comprising: an absorbent main body having a liquid-impermeable film; and a waist member provided on a non-skin side of the absorbent main body, the absorbent main body having a liquid-impermeable film. A plurality of absorbent elastic members are provided on the non-skin side of the impermeable film and expand and contract along the vertical direction, and the absorbent elastic members are arranged at the center in the horizontal direction and have a thickness of a first absorbent elastic member that overlaps with the absorbent core when viewed in the direction; and a first absorbent elastic member that is disposed on the outer side of the first absorbent elastic member in the lateral direction and that overlaps with the absorbent core when viewed in the thickness direction. a second absorbent elastic member that does not overlap with the absorbent core, and overlaps with the absorbent core when viewed from the skin side than the liquid-impermeable film and in the thickness direction. An elastic member whose force is larger than that of the second absorbent elastic member when stretched by a unit length in the longitudinal direction is not provided in the portion where the absorbent main body and the waist member are joined together. The second absorbent elastic member has a body joint portion that is disposed on the most one side in the lateral direction, and the second absorbent elastic member is disposed on the other most side in the lateral direction. The shorts-type napkin is characterized in that it has a portion that overlaps with the main body joint when viewed in the thickness direction .
Other features of the present invention will become apparent from the description of this specification and the accompanying drawings.

According to the present invention, it is possible to provide a shorts-type napkin that does not cause discomfort to the wearer while improving the fit of the absorbent main body.

FIG. 1 is a schematic perspective view of a napkin 1 according to a first embodiment. FIG. 2 is a plan view of the napkin 1 in an unfolded and stretched state. 3 is a schematic cross-sectional view taken along line AA in FIG. 2. FIG. FIG. 2 is a plan view of the absorbent main body 10. FIG. FIG. 2 is a schematic cross-sectional view of the absorbent main body 10. FIG. It is a figure explaining the fit of the napkin 1. FIG. 3 is a diagram illustrating details of the configuration of the side sheet 15 and the arrangement of the absorbent elastic members 50 (51, 52). FIG. 7 is a diagram illustrating the arrangement of a main body joining portion 80 that joins the absorbent main body 10 and the waist member 20. FIG. FIG. 7 is a plan view of a napkin 2 according to a second embodiment in a developed and stretched state.

From the description of this specification and the attached drawings, at least the following matters will become clear.
The absorbent core has a vertical direction, a horizontal direction, and a thickness direction that intersect with each other in the unfolded state, and includes a liquid-absorbent absorbent core, and a liquid-impermeable film provided on the non-skin side of the absorbent core. A shorts-type napkin comprising an absorbent main body and a waist member provided on a non-skin side of the absorbent main body, wherein the absorbent main body is provided on a non-skin side of the liquid-impermeable film. , comprising a plurality of absorbent elastic members that expand and contract along the longitudinal direction, and the absorbent elastic members are disposed at the center in the horizontal direction and are aligned with the absorbent core when viewed in the thickness direction. a first absorbent elastic member that overlaps with the first absorbent elastic member; and a second absorbent elastic member that is arranged on the outer side of the first absorbent elastic member in the lateral direction and that does not overlap with the absorbent core when viewed in the thickness direction. an absorbent elastic member, and in a portion that is closer to the skin than the liquid-impermeable film and that does not overlap with the absorbent core when viewed in the thickness direction, there is a unit in the longitudinal direction. A shorts-type napkin, characterized in that it does not include an elastic member whose force when stretching the length is greater than that of the second absorbent elastic member.

According to such a shorts-type napkin, the elastic force of the first absorbent elastic member allows the absorbent core to fit snugly to the wearer's excretion opening, and the elastic force of the second absorbent elastic member allows the absorbent core to fit snugly against the wearer's excretion opening. The outer lateral area also tends to fit snugly to the wearer's groin area. Further, an elastic member having a higher elastic force than the second elastic member is not provided in a region laterally outside the absorbent core and closer to the skin than the liquid-impermeable film. Therefore, compared to the case where such an elastic member is provided, the elastic member is less likely to dig into the wearer's skin and is less likely to cause discomfort to the wearer.

In such a shorts-type napkin, an elastic member is not provided in a portion that is closer to the skin than the liquid-impermeable film and that does not overlap with the absorbent core when viewed in the thickness direction. , is desirable.

According to such a shorts-type napkin, no elastic member that expands and contracts in the vertical direction is provided in the region laterally outside the absorbent core and closer to the skin than the liquid-impermeable film, so that When worn, such an elastic member is prevented from digging into the wearer's skin, making it less likely that the wearer will feel uncomfortable.

Such a shorts-type napkin has a side sheet on the skin side in the thickness direction of the liquid-impermeable film and on both sides of the absorbent body in the lateral direction, and the side sheet is located on the skin side in the thickness direction and on both sides of the absorbent body in the lateral direction. It is desirable that no elastic member is provided between the surface and the liquid-impermeable film in the thickness direction.

According to such shorts-type napkins, the side sheets are provided on the skin side and both sides of the absorbent body, which makes it difficult to form a gap with the wearer's body (groin area), making it difficult to wear. This makes it easier to prevent the excretory fluid from leaking sideways along the skin of the person. Furthermore, since no elastic member is disposed near the surface of the side sheet that comes into contact with the wearer's skin, the side sheet is less likely to dig into the wearer's skin and is less likely to cause discomfort to the wearer's skin.

In such a shorts-type napkin, it is desirable that the side sheet and the second absorbent elastic member have an overlapping portion when viewed in the thickness direction.

According to such a shorts-type napkin, when the napkin is worn, the contraction force when the second elastic member contracts tends to act on the side sheet overlapped with the skin side in the thickness direction. This makes it easier for the side sheet to be pressed against the wearer's skin (groin area), making it easier to suppress side leakage of excretory fluid.

In this shorts-type napkin, the second absorbent elastic member includes a second inner elastic member and a second outer elastic member disposed laterally outward than the second inner elastic member. The number of sheet members stacked on the skin side in the thickness direction of the inner second elastic member is the number of sheet members stacked on the skin side in the thickness direction of the outer second elastic member. More than that is desirable.

According to such a shorts-type napkin, the absorbent body deforms more flexibly in the skin-side region of the outer second elastic member than in the skin-side region of the inner second elastic member, and the absorbent body deforms more flexibly than in the skin-side region of the inner second elastic member. easier to fit. That is, the laterally outer region of the side sheet comes into closer contact with the wearer's body than the inner region, and it is possible to more easily suppress lateral leakage of excretory fluid.

In such a shorts-type napkin, it is preferable that the inner end of the side sheet is located outside the outer end of the absorbent core in the lateral direction.

According to such a shorts-type napkin, when worn, the side sheet is less affected by the highly rigid absorbent core, and easily deforms according to the unevenness of the wearer's body and adheres closely to the skin. . Thereby, side leakage of excretory fluid can be more easily suppressed.

In this shorts-type napkin, in the lateral direction, between the inner end of the side sheet and the outer end of the side sheet, another sheet member facing the non-skin side of the side sheet and the side sheet are provided. It is desirable that the material has a non-bonded part.

According to such a shorts-type napkin, the side sheet is less likely to be restrained by other sheet members and can be freely deformed in the non-joined portion. Therefore, for example, the non-jointed portion deforms into a convex shape in the thickness direction and functions like a cushion, making it possible to make the side sheet feel soft against the skin when wearing a shorts-type napkin. Further, since the non-jointed portion is freely deformed, adhesion to the wearer's skin in the inguinal region is increased, and side leakage of excretory fluid can be more easily suppressed.

Such a shorts-type napkin has a side sheet joint part, which is located inside the non-joint part in the lateral direction, and where the side sheet is joined to another sheet member facing the non-skin side of the side sheet. However, it is desirable that the width of the non-joined portion is larger in the lateral direction than the distance between the inner end of the side sheet joining portion and the inner end of the side sheet.

According to such a shorts-type napkin, when the shorts-type napkin is worn, the region (non-joined portion) that can be freely shaped in the side sheet becomes wider, compared to the reverse case. Therefore, the cushioning properties of the side seat and its adhesion to the skin can be further improved.

Such a shorts-type napkin has a main body joining portion that joins the absorbent main body and the waist member, the waist member has a front waist portion and a rear waist portion, and both ends in the lateral direction a pair of side joint parts that join the front waist part and the rear waist part to each other at the front waist part; When the area between the provided side joint portion is defined as the crotch area, in the crotch area, the second absorbent elastic member disposed on the most one side in the lateral direction and the most other side in the lateral direction It is desirable that the distance in the lateral direction between the second absorbent elastic member disposed on the side is longer than the width of the main body joint in the lateral direction.

According to such shorts-type napkins, the absorbent body and the girth member are not joined in the area laterally outside the main body joint, and it is difficult for the two to interlock, so the contraction caused by the absorbent elastic member It becomes easier for force to act on the side seat independently of the waist member. That is, the second absorbent elastic member makes it easier for the side sheet to fit the wearer's skin, independently of the effects of deformation of the waist member when worn. Therefore, side leakage of excretory fluid and the like in the crotch area is effectively suppressed, making it difficult to cause discomfort to the wearer.

In such a shorts-type napkin, in the crotch region, an inner end of the side sheet disposed on one side in the lateral direction and an inner end of the side sheet disposed on the other side in the lateral direction. It is desirable that the distance between them in the lateral direction is longer than the width of the main body joint in the lateral direction.

According to such a shorts-type napkin, since it is difficult for the absorbent body and the girth member to interlock in the area laterally outside the main body joint, the side sheet itself can freely move without being affected by the girth member. It becomes easier to deform. Therefore, it is possible to more easily fit the side sheet to the wearer's skin.

In such a shorts-type napkin, in the rear portion on the rear side in the vertical direction relative to the crotch area, the inner end of the side sheet disposed on one side in the horizontal direction and the other side in the horizontal direction It is desirable that the distance in the lateral direction between the side sheet and the inner end of the disposed side sheet is longer than the width of the main body joint in the lateral direction.

According to such a shorts-type napkin, it is possible to improve the fit of the side sheet in the rear region where the body has large irregularities due to the roundness of the buttocks.

In such a shorts-type napkin, in the longitudinal direction, at a position where the width of the absorbent core in the lateral direction is narrowest, the width of the main body joint in the lateral direction is smaller than the width of the absorbent core in the lateral direction. It is desirable that the width in the direction is longer.

According to such a shorts-type napkin, at the constriction where the width of the absorbent core is narrowed, the entire width direction of the absorbent core is easily pressed against the wearer's skin in conjunction with the waist member, and the absorbent core This makes it easier to fit the surface of the wearer's groin area (excretory opening). As a result, leakage of excretory liquid is suppressed, and a large gap is formed between the excretion port and the absorbent core, which can prevent the wearer from feeling uncomfortable.

In this shorts-type napkin, the waist member has a front waist part and a rear waist part, and a pair of body parts that join the front waist part and the rear waist part to each other at both ends in the lateral direction. When the crotch area has a side joint part, and the region between the side joint part provided in the front waist part and the side joint part provided in the rear waist part in the longitudinal direction is defined as the crotch part, In the crotch region, it is preferable that the fiber density of the sheet member constituting the side sheet is smaller than the fiber density of the sheet member constituting the waist member.

According to such a shorts-type napkin, by reducing the fiber density of the sheet member constituting the side sheet, the side sheet can easily become flexible and can be soft against the sensitive crotch area. On the other hand, by increasing the fiber density of the sheet member constituting the waist member, the liquid retention property around the waist increases, making it easier to suppress leakage of excretory fluid to the outside of the napkin. Thereby, it is possible to make it difficult to cause discomfort to the wearer.

In such a shorts-type napkin, each of the sheet members constituting the side sheets and the sheet members constituting the girth member is provided with a plurality of compressed parts, and the unit area of the sheet members constituting the side sheets is The total area of the compressed portions provided per unit area of the compressed portions provided per unit area of the sheet member constituting the waist member of the portion laminated with the side sheet at the thickness is greater than Preferably small.

According to such a shorts-type napkin, the unevenness on the surface of the side sheet is smaller than the unevenness on the surface of the waist member, and the surface of the side sheet can be made smoother. Thereby, when the side sheet comes into contact with the wearer's groin region, it is possible to prevent the wearer from feeling uncomfortable.

In such a shorts-type napkin, the length in the longitudinal direction of the portion on which the stretching force of the first absorbent elastic member acts is equal to the length in the longitudinal direction of the portion on which the stretching force of the second absorbent elastic member acts. Preferably longer than length.

According to such a shorts-type napkin, by shortening the length of the part on which the stretching force of the second absorbent elastic member acts on both sides in the lateral direction, the second absorbent elastic member can be applied to the buttocks protrusion. It is possible to prevent it from digging in. In addition, by increasing the length of the portion of the first absorbent elastic member on which the stretching force acts in the lateral central portion, a wide range of the absorbent core in the vertical direction can be fitted tightly to the wearer's body. I can do it. This improves the absorbency of excretory fluid and reduces discomfort and discomfort when worn.

In such a shorts-type napkin, it is preferable that the absorbent elastic member does not have a convex portion that is convex outward in the lateral direction.

According to such a shorts-type napkin, when the shorts-type napkin is worn, the convex portions are prevented from interfering with the wearer's legs, making it difficult for the wearer to feel uncomfortable.

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

<Basic structure of napkin 1>
FIG. 1 is a schematic perspective view of a napkin 1 according to the first embodiment. FIG. 2 is a plan view of the napkin 1 in the unfolded and stretched state. FIG. 3 is a schematic cross-sectional view taken along line AA in FIG.

Note that the "stretched state" of the napkin 1 means that the entire napkin 1 (product The entire napkin 1) is stretched without wrinkles, and specifically, it is stretched until the dimensions of each member constituting the napkin 1 match or are close to the dimensions of that member alone.

As shown in FIG. 1, the napkin 1 has a "vertical direction", a "horizontal direction", and a "front-back direction" that are orthogonal to each other. Moreover, as shown in FIG. 3, it has a "thickness direction" which is the direction in which each member is laminated. In the vertical direction, when the wearer is wearing the napkin 1, the side that is on the torso side of the wearer is defined as the "upper side", and the side that is on the crotch side of the wearer as the "lower side". Also, in the front-back direction, the side that is on the ventral side of the wearer when worn is referred to as the "front side", and the side that is on the back side of the wearer as the "rear side". Furthermore, in the thickness direction, the side that contacts the wearer's skin when the wearer wears the napkin 1 is defined as the "skin side", and the opposite side is defined as the "non-skin side".

Further, in the unfolded state shown in FIG. 2, the napkin 1 has a "vertical direction" and a "horizontal direction" that are orthogonal to each other. The "vertical direction" is a direction along the up and down direction of the pants shape, and the "horizontal direction" is the direction along the left and right direction of the pants shape.

The napkin 1 of this embodiment includes a liquid-absorbing absorbent body 10 that absorbs liquid such as menstrual blood, and an exterior member disposed on the non-skin side of the absorbent body 10, which is worn when the napkin 1 is worn. The waist member 20 is a part arranged around the person's waist.

(Absorbent main body 10)
FIG. 4 is a plan view of the absorbent main body 10. FIG. 5 is a schematic cross-sectional view of the absorbent main body 10. As shown in FIG. 2, the absorbent main body 10 of this embodiment has a substantially rectangular shape in plan view, with the vertical direction (corresponding to the long side direction of the absorbent main body 10) extending along the vertical direction of the napkin 1. As shown in FIGS. 4 and 5, the absorbent main body 10 includes an absorbent core 11 along the vertical direction (vertical direction), a top sheet 12 arranged closer to the skin than 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 of the absorbent core 11, and a side disposed on the non-skin side of the back sheet 14. It has a sheet 15.

The absorbent core 11 is a member that absorbs and retains liquid such as menstrual blood, and is formed of liquid-absorbing fibers such as pulp fibers mixed with superabsorbent polymer (SAP), for example. Note that the absorbent core 11 may be covered with a liquid-permeable sheet member (core wrap sheet) such as tissue paper or nonwoven fabric.

The top sheet 12 is a liquid-permeable sheet member that can come into contact with the wearer's skin when worn, and in this embodiment, it is made of, for example, hydrophilic air-through nonwoven fabric, spunbond nonwoven fabric, cotton, or the like. Ru. The top sheet 12 allows excreted menstrual blood, etc. to permeate from the skin side to the non-skin side in the thickness direction and is absorbed into the absorbent core 11, and also allows the menstrual blood, etc. to return from the absorbent core 11 to the skin side. (so-called rewetting).

The second sheet 13 is formed of a sheet member such as an air-through nonwoven fabric, and is laminated on the non-skin side of the top sheet 12. In the napkin 1, the width of the second sheet 13 in the left-right direction is longer than the width of the top sheet 12 in the left-right direction.

The backsheet 14 is a breathable and liquid-impermeable sheet member (equivalent to a "liquid-impermeable film") for suppressing leakage of liquids such as menstrual blood absorbed into the absorbent core 11 to the outside. For example, it is formed of 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 made of, for example, a hydrophobic nonwoven fabric such as an air-through nonwoven fabric. In the present embodiment, as shown in FIG. 5, the side sheet 15 extends to both outer sides of the absorbent core 11 in the left-right direction (lateral direction), and has a thickness at both ends of the absorbent body 10 in the left-right direction. It is bent toward the skin side in the width direction, and the bent end portion 15t is arranged closer to the skin side than the absorbent core 11 and the top sheet 12. On the skin side of the absorbent core 11 (top sheet 12), the end portions 15t, 15t of the side sheet 15 are arranged on both sides in the left and right direction, so that menstrual blood, etc. can be transmitted along the surface of the top sheet 12 and left and right. When moving in the direction, movement of the menstrual blood, etc. can be stopped by the end portions 15t, 15t. That is, when the napkin 1 is worn, the ends 15t, 15t of the side sheet 15 can suppress side leakage of menstrual blood and the like. Further, a part of the backsheet 14 together with the sidesheets 15 may be bent toward the skin side of the absorbent core 11 (topsheet 12).

In FIG. 5, the end portions 15t of the side sheets 15 are arranged closer to the skin than the absorbent core 11 by bending the side sheets 15 toward the skin at both end portions in the left-right direction of the absorbent main body 10. . On the other hand, the end portion 15t may be formed by a sheet member separate from the sheet member (15) disposed on the non-skin side of the backsheet 14. That is, a sheet member on the non-skin side of the back sheet 14 (liquid-impermeable film) and a sheet member on the skin side (corresponding to 15t in FIG. 5) that is different from the non-skin side sheet member make the side The sheet 15 may also be configured.

Further, the absorbent main body 10 is provided with a high-density portion 17 in which the density of the absorbent core 11 is higher than the surrounding portion. The high-density portion 17 is formed by compressing each member constituting the absorbent main body 10 in the thickness direction. As shown in FIG. 4, the high-density portion 17 of this embodiment is formed into a curved shape by lining up a plurality of dot-shaped compressed portions. By providing such a high-density portion 17, the liquid absorbent fibers of the absorbent core 11 are prevented from coming apart and losing their shape. Furthermore, when the napkin 1 is worn, the high-density portion 17 serves as a starting point for bending, making it easier for the absorbent core 11 to deform three-dimensionally according to the wearer's body shape, thereby fitting the wearer's body. It becomes easier.

Further, the absorbent main body 10 is provided with a plurality of absorbent elastic members 50 that expand and contract along the vertical direction (vertical direction). The absorbent elastic member 50 is formed of, for example, rubber thread, and extends in the vertical direction (vertical direction) on the non-skin side (in FIG. 5, between the back sheet 14 and the side sheet 15). It is located in the state. In this embodiment, as shown in FIGS. 4 and 5, a pair of central absorbent elastic members 51 are arranged at the center in the left-right direction, and two pairs of both side parts are arranged at both ends in the left-right direction. A total of six absorbent elastic members 50 of the absorbent elastic members 52 are provided. In the napkin 1, the central absorbent elastic member 51 (first absorbent elastic member) overlaps the absorbent core 11 when viewed in the thickness direction. On the other hand, the side absorbent elastic members 52 (second absorbent elastic members) are arranged laterally outward from the central absorbent elastic member 51, and overlap with the absorbent core 11 when viewed in the thickness direction. (See Figure 4, etc.)

The elongation magnification of each of the absorbent elastic members 50 (51, 52) is preferably about 2.7 to 3.2 times. Note that the "stretching magnification" of an elastic member is defined as: After measuring a certain length of an elastic member in a stretched state, the measured certain length is cut out and made into a state where only the elastic member is left using an organic solvent or the like. This is the value obtained by measuring the length of the elastic member in its natural state after air-drying the organic solvent for 24 hours, and dividing the length. When the napkin 1 is worn, the absorbent core 11 is easily pushed up from the non-skin side to the skin side in the thickness direction due to the elasticity of the absorbent elastic member 50, and the absorbent core 11 is easily pushed up against the wearer's body from the non-skin side to the skin side. This makes it easier to fit the sexual core 11). In other words, the absorbent main body 10 comes into close contact with the wearer's crotch area, making it difficult for excretory fluids such as menstrual blood to leak.

(Girth member 20)

The waist member 20 is a composite sheet formed by laminating a plurality of sheet members. The waist member 20 in this embodiment includes a non-skin side sheet 21 and skin side sheets 22 and 23 (see FIG. 3). In addition, in the following description, for convenience, the part of the waist member 20 on the front side (ventral side) of the center position CL in the longitudinal direction is referred to as the front waist part 20f, and the part on the back side (dorsal side) of the center position CL. This portion is also referred to as the rear waistline portion 20b.

The non-skin side sheet 21 is a non-stretchable sheet member disposed on the non-skin side of the waist member 20, and is formed of, for example, spunbond nonwoven fabric, SMS nonwoven fabric, or the like. In the present embodiment, the non-skin side sheet 21 has a shape that is tapered inward in the left-right direction at the center portion in the vertical direction (the portion including the center position CL), as shown in a plan view in FIG. There is.

The skin-side sheet 22 is a stretchable sheet member (stretch sheet) laminated on the skin side of the non-skin-side sheet 21 on the front side (ventral side) in the longitudinal direction, and is formed of, for example, a stretchable nonwoven fabric. "Stretchable nonwoven fabric" is a nonwoven fabric that includes stretchable fibers that have stretchability and stretchable fibers that have lower stretchability than the stretchable fibers, and has been subjected to an appropriate stretching process such as gear stretching. In the skin-side sheet 22 of this embodiment, fibers of polyurethane elastomer, which is a type of thermoplastic elastomer having elasticity, can be used as the stretchable fibers, and thermoplastic resin having inelasticity can be used as the stretchable fibers. It is possible to use fibers of polypropylene (PP), a type of polyolefin resin.

The skin side sheet 22 is joined to the non-skin side sheet 21 by a plurality of welded parts 60 (see FIG. 2) arranged based on a predetermined pattern. Provides elasticity along the line. That is, in the front waist portion 20f, a "waist elastic region GER" having elasticity in the left-right direction is formed in the region where the skin-side sheet 22 is arranged. In this embodiment, the welded portion 60 is formed using a known joining means such as ultrasonic welding. The welded portion 60 shown in FIG. 2 is formed in a pattern in which rectangular dots with a side of about 0.2 to 0.8 mm are regularly arranged at a pitch of about 1 to 3 mm. The shape and arrangement pattern of 60 are not limited to the example shown in FIG. Furthermore, different patterns of welded portions 60 may be formed in different regions of the waist member 20. For example, in a region overlapping with the absorbent main body 10, welded portions 60 may be formed in a pattern different from that in other regions.

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 (dorsal side) in the longitudinal direction. The skin-side sheet 23 has the same configuration as the skin-side sheet 22. That is, the skin-side sheet 23 is formed of a stretchable nonwoven fabric, and is joined to the non-skin-side sheet 21 by a plurality of scattered welds 60 (see FIG. 2). As a result, in the region of the rear waist section 20b where the skin-side sheet 23 is arranged, a "waist elastic region GER" having elasticity in the left-right direction is formed like the front waist section 20f.

The front waist part 20f of the waist member 20 is formed with a front folded part 30 in which the non-skin side sheet 21 is folded back from the skin side to the non-skin side at the upper end 20ef in the vertical direction (the front end in the vertical direction). (See Figure 3). A waist upper end elastic member 25 such as thread rubber is provided between the front folded portion 30 and the non-skin side sheet 21 in the thickness direction so that it can be expanded and contracted along the left-right direction. By providing such a waistline upper end elastic member 25, the fit on the front side (ventral side) of the waistline opening 1a is improved, and when the napkin 1 is worn, displacement of the waistline member 20 can be suppressed.

In the napkin 1, the front folded portion 30 corresponds to an "outer sheet 30" laminated on the non-skin side (outer side) surface of the front waist portion 20f. This outer sheet 30 is joined to the non-skin side sheet 21 via an adhesive such as a hot melt adhesive applied to the outer peripheral surface of the upper end elastic member 25. That is, the outer sheet 30 (front folded portion 30) has a sheet joint portion 31 joined to the non-skin side sheet 21 of the front waist portion 20f at the portion where the upper waist elastic member 25 is provided. . However, the adhesive forming the sheet joint 31 is not applied to the upper waist elastic member 25, but is applied directly to predetermined areas of the outer sheet 30 and the non-skin side sheet 21. It's okay.

Further, the outer sheet 30 (front folded portion 30) has a sheet non-joining portion 32 that is not joined to the non-skin side sheet 21 in a portion adjacent to the sheet joining portion 31 in the vertical direction. The sheet non-joining portion 32 has a predetermined width in the left-right direction, and in the sheet non-joining portion 32, the outer sheet 30 can be freely deformed independently of the waist member 20 (front waist portion 20f). be. When the napkin 1 is worn, when the waist member 20 contracts in the left-right direction, the non-joined portions 32 of the sheet deform and form large fold-like wrinkles, creating frills around the waist as shown in FIG. It looks like it has been installed. Details of the frill formed by the sheet non-joining portion 32 will be described later.

Furthermore, a temporary fixing joint 33 may be provided at the lower end of the outer sheet 30 for temporarily fixing the outer sheet 30 to the front waist portion 20f. In FIG. 2, a dot-shaped temporary joint is located at a position above the lower end of the outer sheet 30 by a predetermined distance (for example, about 4 mm) and joins the outer sheet 30 (sheet non-joined portion 32) and the front waist portion 20f. 33 are provided in plurality at a predetermined interval W33 in the left-right direction. The temporary joint 33 uses a known adhesive or welding means to spot-join the sheet members facing each other in the thickness direction (here, the outer sheet 30 and the non-skin side sheet 21) to the extent that they can be peeled off manually. This is the part where it was done. By providing such a temporarily fixed joint part 33, the entire sheet non-joint part 32 will be rolled up during the manufacture of the napkin 1 or during the distribution process of the manufactured napkin 1 in the market, thereby preventing beautiful frills from being rolled up. This makes it possible to suppress the formation of such particles.

Note that the temporary joint portion 33 may have a shape other than a dot shape as shown in FIG. 2 . For example, a configuration may be adopted in which a plurality of temporary joints 33 formed linearly in the vertical direction (vertical direction) are lined up at a predetermined interval W33 in the left-right direction. Further, if there is another means for suppressing the sheet non-joining portion 32 from being rolled up, the temporary joining portion 33 may not necessarily be provided.

In this embodiment, a part of the non-skin side sheet 21 is folded back at the upper end 20ef of the front waist portion 20f, and is laminated on the non-skin side of the non-skin side sheet 21, thereby forming the outer sheet 30 (front folded portion 30). However, the outer sheet 30 may be a different sheet member from the non-skin side sheet 21. That is, the outer sheet 30 may be formed by laminating a separate sheet member (such as a nonwoven fabric) on the non-skin side surface of the non-skin side sheet 21 and joining a part of the sheet member.

On the other hand, as shown in FIG. 3, in the rear waist portion 20b of the waist member 20, the non-skin side sheet 21 is attached from the non-skin side to the skin side at the upper end 20eb in the vertical direction (the rear end in the vertical direction). A rear folded portion 40 is formed by folding back. In the rear side folding section 40, a part of the skin side sheet 23 may be folded back together with the non-skin side sheet 21. In the rear folded portion 40, between the skin side sheets 23, 23 folded back at the upper end 20eb in the thickness direction, a waist upper end elastic member 25 such as thread rubber is attached in the left-right direction, similar to the front waist portion 20f. A plurality of them are provided so that they can be expanded and contracted along the line. By providing such a waistline upper end elastic member 25, the fit on the rear side (dorsal side) of the waistline opening 1a is improved, and when the napkin 1 is worn, displacement of the waistline member 20 can be suppressed.

The rear folded part 40 has a rear sheet joint part 41 joined to at least one of the rear waist part 20b and the absorbent main body 10 on the rear side (dorsal side) in the front-rear direction (thickness direction). There is. Further, in a portion adjacent to the rear sheet joint portion 41 in the vertical direction, there is a rear sheet non-joined portion 42 that is not joined to at least either the rear waist portion 20b or the absorbent main body 10.

When forming the pants-shaped napkin 1, the absorbent main body 10 and the waist member 20 are folded vertically from the unfolded state shown in FIG. It is folded in half in the direction (back and forth). In the folded state, both lateral (horizontal) ends 20fe, 20fe of the front waistline portion 20f, which overlap in the front-rear direction, and both lateral (horizontal) ends 20be, 20be of the rear waistline 20b are sealed. The side joint portions 20we are formed by joining using a known joining means such as welding. As a result, the folded waist member 20 (the waist portions 20f and 20b) is connected in an annular manner on the front side (ventral side) and the rear side (dorsal side), and forms one waist opening 1a and 1 as shown in FIG. A pair of leg openings 1b, 1b are formed, resulting in a pants-shaped (shorts-shaped) napkin 1.

Further, in the unfolded and stretched state shown in FIG. 2, the region that overlaps the side joint portion 20we (20fe) formed in the front waist portion 20f in the vertical direction (vertical direction) is also referred to as the front side portion Rf. Similarly, a region that overlaps the side joint portion 20we (20be) formed in the rear waist portion 20b in the vertical direction (vertical direction) is also referred to as the rear side portion Rb. The region between the front side part Rf and the rear side part Rb in the vertical direction (vertical direction) is also referred to as the crotch area Rc.

<About the fit of the absorbent body 10>
Next, the fit of the absorbent main body 10 when the napkin 1 is worn will be explained. FIG. 6 is a diagram illustrating the fit of the napkin 1. FIG. 6A shows the cross-sectional shape of the absorbent main body 10 before the napkin 1 is worn, and FIG. 6B shows the cross-sectional shape of the absorbent main body 10 when the napkin 1 is worn.

As shown in FIG. 6A, the absorbent main body 10 of the napkin 1 before being worn has, in the stretched state, a top sheet 12, a second sheet 13, an absorbent core 11, and a back layer in order from the skin side to the non-skin side in the thickness direction. The sheet 14 (liquid-impermeable film) and the side sheet 15 are laminated to form a substantially planar shape. Both ends of the side sheet 15 in the lateral direction are folded back toward the skin side, and both ends 15t, 15t are laminated on the skin side of the top sheet 12.

When wearing the napkin 1, the wearer's legs are passed from the waist opening 1a to the leg openings 1b, 1b, and the waist member 20 is placed so that the skin side of the absorbent main body 10 is applied to the wearer's crotch area (crotch area). A lifting action is performed. At that time, the absorbent main body 10 is moved from the non-skin side to the skin side by the elasticity developed by the absorbent elastic members 50 (51, 52) provided on the non-skin side of the backsheet 14 (liquid-impermeable film). A pushing force acts on the Specifically, as shown in FIG. 6B, a pair of central absorbent elastic members 51, 51 (corresponding to "first absorbent elastic members", hereinafter referred to as "first absorbent elastic members") arranged at the center in the lateral direction. 1 elastic member 51"), the absorbent core 11 is pressed against the wearer's excretory opening. In addition, two pairs of side absorbent elastic members 52, 52 (corresponding to "second absorbent elastic members", hereinafter also referred to as "second elastic members 52") arranged on both sides in the lateral direction, A region laterally outside the absorbent core 11 is pressed against the wearer's groin region. This makes it easier for the absorbent main body 10 to fit the wearer's crotch area as a whole.

The elastic force of the first elastic member 51 makes it difficult to form a gap between the absorbent core 11 and the wearer's excretion opening, so that excretory fluids such as menstrual blood flow along the wearer's skin. In addition, the excreted liquid is more likely to seep into the top sheet 12. The soaked excreta then spreads along the top sheet 12 in the vertical and horizontal directions, making it easier for the excreta to be absorbed in a wide area of the absorbent core 11, and also for the excreta to stay in one place. Therefore, so-called "rewetting" in which the wearer's skin gets wet again can be suppressed.

Further, due to the elastic force of the second elastic member 52, the region laterally outside the absorbent core 11 (the region overlapping with the side sheet end portion 15t) fits the wearer's groin region without a gap. Therefore, "lateral leakage" in which excretory fluid that has spread laterally along the top sheet 12 leaks to the outside of the absorbent body 10 in the lateral direction is suppressed. In particular, in the napkin 1, since the highly rigid absorbent core 11 and the second elastic member 52 do not overlap when viewed in the thickness direction, there is no overlap with the second elastic member 52 in the absorbent body 10. It has high flexibility in the surrounding area, allowing it to deform freely and easily fit the wearer's body.

In addition, in a conventional shorts-type absorbent article (not shown), a separate elastic member is provided at a portion corresponding to the side sheet end portion 15t (skin side of both sides of the absorbent main body 10, that is, skin side from the back sheet 14). It has been common practice to provide a side sheet end 15t to stand up toward the skin side by the elastic force exerted by the elastic member, so that the side sheet end 15t functions as a leak-proof wall (so-called three-dimensional gathers). However, if an elastic member with a strong elasticity is provided on the skin side in a portion that does not overlap with the absorbent core 11, the elastic member tends to dig into the wearer's skin, causing discomfort to the wearer. was there.

On the other hand, in the shorts-type napkin 1 of the present embodiment, at least the second elastic layer is provided in an area closer to the skin than the backsheet 14 (liquid-impermeable film) and which does not overlap with the absorbent core 11. An elastic member having a higher stretching force than the member 52 is not provided. Therefore, compared to the case where such an elastic member is provided, the wearer is less likely to feel uncomfortable. Here, the "stretching force" of the elastic member refers to the magnitude of the force when stretching the elastic member by a unit length along the longitudinal direction (vertical direction).

In this way, in the napkin 1, the elastic force of the first elastic member 51 allows the absorbent core 11 to easily fit snugly to the wearer's excretion opening, and the elastic force of the second elastic member 52 allows the absorbent core 11 to fit more easily than the absorbent core 11. The outer region tends to fit snugly against the wearer's groin area. Thereby, side leakage of excretory fluid, etc. can be effectively suppressed. Further, an elastic member having a higher stretching force than the second elastic member 52 is provided in a region laterally outside the absorbent core 11 and closer to the skin than the backsheet 14 (liquid-impermeable film). do not have. Therefore, the absorbent main body 10 is prevented from digging into the wearer's skin, and the wearer is less likely to feel uncomfortable.

Note that, in the napkin 1, no elastic member that expands and contracts in the vertical direction is provided in the region laterally outside the absorbent core 11 and closer to the skin than the backsheet 14 (liquid-impermeable film). (See Figure 5, etc.). Therefore, when wearing the napkin 1, the wearer is less likely to feel uncomfortable.

More specifically, in the napkin 1, the surface of the side sheet 15 (end portion 15t) closest to the skin (corresponding to the end skin side surface 15tu in FIG. 7) and the back sheet 14 (liquid-impermeable film) An elastic member that expands and contracts in the vertical direction is not provided between them. Therefore, the side sheet end portion 15t does not stand up like a leak-proof wall, and can easily fit the wearer's body face-to-face. This makes it difficult for a gap to be formed between the side sheet end portion 15t and the wearer's body, making it easier to suppress sideways leakage of excretory fluid along the wearer's skin. In addition, since no elastic member is arranged near the surface of the side sheet end portion 15t that comes into contact with the wearer's skin, the side sheet end portion 15t is difficult to dig into the skin, causing discomfort to the wearer's skin. hard.

FIG. 7 is a schematic cross-sectional view of the absorbent main body 10 illustrating details of the configuration of the side sheet 15 and the arrangement of the absorbent elastic members 50 (51, 52). As shown in FIG. 7, when the napkin 1 of this embodiment is viewed in the thickness direction, the second elastic member 52 has a portion that overlaps with the end portion 15t of the side sheet 15. In other words, the second elastic member 52 is disposed in a region between the inner end 15tei and the outer end 15teо of the end portion 15t of the side sheet 15 in the lateral direction. Therefore, when the napkin 1 is worn, the contraction force when the second elastic member 52 contracts acts on the end portion 15t of the side sheet 15 disposed on the skin side in the thickness direction of the second elastic member 52. It's easy to do. This makes it easier for the end portion 15t of the side sheet 15 to be pressed against the wearer's skin (groin area), making it easier to suppress side leakage of excretory fluid.

Further, among the second elastic members 52, the elastic member disposed on the inner side in the lateral direction is referred to as an inner second elastic member 521, and the elastic member disposed on the outer side in the lateral direction is referred to as an outer second elastic member 522. At this time, in the thickness direction, the number of sheet members stacked on the skin side of the inner second elastic member 521 is greater than the number of stacked sheet members stacked on the skin side of the outer second elastic member 522. A large number is desirable.

In the napkin 1 of this embodiment, the side sheet 15 is folded back inward at the lateral outer end 15teо, and further folded back outward at the lateral inner end 15tei to form the side sheet end 15t. has been done. Of the side sheet end portions 15t, if the skin side surface is an end skin side surface 15tu and the non-skin side surface is an end non-skin side surface 15td, in FIG. On the skin side), five sheet members are laminated: a back sheet 14, a second sheet 13, a top sheet 12, an end non-skin side 15td, and an end skin side 15tu. On the other hand, two sheet members, the back sheet 14 and the end skin side surface 15tu, are laminated directly above the second outer elastic member 522 (on the skin side). That is, the number of stacked sheet members stacked closer to the skin than the second inner elastic member 521 is greater than the number of stacked sheet members stacked closer to the skin than the second outer elastic member 522. .

Since the smaller the number of laminated sheet members in the thickness direction, the lower the rigidity, the absorbent main body 10 becomes more flexible in the skin-side region of the outer second elastic member 522 than in the skin-side region of the inner second elastic member 521. It becomes easier to deform and fit the wearer's body. That is, the laterally outer region of the side sheet end portion 15t comes into closer contact with the wearer's body than the inner region, and it is possible to more easily suppress lateral leakage of excretory fluid.

In addition, in the lateral direction of the absorbent main body 10, the inner end 15tei (the right end in FIG. 7) of the side sheet 15 (end portion 15t) is closer to the outer end 11eо (the left end in FIG. 7) of the absorbent core 11. ) is located outside. That is, when viewed in the thickness direction, there is no overlap between the absorbent core 11 and the skin-side end 15t of the side sheet 15. Therefore, when the napkin 1 is worn, when the absorbent main body 10 fits around the wearer's crotch area, the side sheet 15 is less affected by the highly rigid absorbent core 11 and adapts to the unevenness of the wearer's body. It can be easily deformed and adheres closely to the skin. Thereby, side leakage of excretory fluid can be more easily suppressed.

Further, the end portion 15t of the side sheet 15 of the napkin 1 is a sheet member located between the outer end 15teо and the inner end 15tei in the lateral direction and facing the side sheet end 15t and the non-skin side in the thickness direction. It has a non-joint part where the two are not joined. In FIG. 7, an outer end joint 75 formed with an adhesive such as a hot melt adhesive near the outer end 15teо in the lateral direction causes the end skin side surface 15tu of the side sheet 15 to become non-uniform in the thickness direction. It is joined to the back sheet 14 facing the skin side. On the other hand, near the inner end 15tei in the lateral direction, an inner end joint 76 formed with an adhesive such as a hot melt adhesive connects the end skin side surface 15tu and the end non-skin side surface 15td of the side sheet 15. The side sheet end portion 15t (end non-skin side surface 15td) is joined to the top sheet 12 facing in the thickness direction by a side sheet joint portion 71 formed with an adhesive such as a hot melt adhesive. It is joined. The area represented by g71c between the outer end joint portion 75 and the side sheet joint portion 71 is a non-joint portion where the side sheet end portion 15t and the sheet member facing in the thickness direction are not joined. It has become.

In this non-jointed portion (g71c), the side sheet end 15t is not easily restrained by other sheet members and can be freely deformed, so that the side sheet end 15 feels soft against the skin when wearing the napkin 1. can do. For example, when the napkin 1 is pinched between the wearer's legs and a compressive force is applied from the outside to the inside in the lateral direction, the non-jointed portion (g71c) will deform into a convex shape in the thickness direction. become. As described above, when the napkin 1 of this embodiment is worn, a force is applied by the second absorbent elastic member 52 that presses the side sheet end 15t against the skin of the wearer. At this time, the side sheet end portion 15t is deformed in a convex manner at the non-joined portion (g71c), thereby functioning like a cushion against the wearer's skin, thereby reducing the wearer's discomfort and discomfort. Further, by freely deforming the non-jointed portion (g71c), the adhesiveness to the unevenness of the wearer's inguinal region increases, making it easier to suppress side leakage of excretory fluid.

Further, if the area between the inner end 71ei of the side sheet joint portion 71 and the inner end 15tei of the side sheet end portion 15t in the lateral direction is g71i, then the distance (width) in the lateral direction of the non-joint portion g71c is is preferably larger than the distance (width) of g71i in the lateral direction (g71c>g71i) (see FIG. 7). With such a configuration, when the napkin 1 is worn, the area in which the non-joined portion (g71c) of the side sheet end portion 15t can be deformed in a convex manner becomes wider than in the opposite case (g71c<g71i). Therefore, the cushioning properties and adhesion to the skin of the side seat end portion 15t can be further improved.

Next, the fit of the side seat end portion 15t will be explained. FIG. 8 is a diagram illustrating the arrangement of the main body joining portion 80 that joins the absorbent main body 10 and the waist member 20. In FIG. 8, the region in which the main body joining portion 80 is formed in the absorbent main body 10 in the stretched state is indicated by a diagonal line.

The absorbent main body 10 of the napkin 1 has a main body joint made of hot melt adhesive or the like coated in the shaded area in FIG. It is joined to the skin side of the waist member 20 via 80 (see FIG. 3). Therefore, in the region where the absorbent main body 10 and the waist member 20 are joined by the main body joint 80, the absorbent main body 10 is integrally configured with the waist member 20, and when the napkin 1 is worn, both deform in conjunction with each other. Begin to move or move.

In the napkin 1 of this embodiment, in the crotch Rc, the waist elastic member 50 (for example, the outer second elastic member 522 at the left end) is disposed on the most one side in the lateral direction, and the waist elastic member 50 is disposed on the most other side in the lateral direction. It has a portion in which the distance in the lateral direction from the waist elastic member 50 (for example, the outer second elastic member 522 at the right end) is longer than the distance (width) in the lateral direction to the main body joint portion 80 . In FIG. 8, the main body joint portion 80 has a portion where the width in the horizontal direction is narrower on the rear side in the vertical direction than the center position CL in the crotch Rc, and the width B in this portion is It is smaller than the distance A between the two elastic members 522, 522 in the lateral direction (A>B). Similarly, the main body joint portion 80 has a portion where the width in the horizontal direction is narrower on the front side in the vertical direction than the center position CL, and the width E in this portion is the width of the outer second elastic members 522, 522. The distance between the directions is smaller than the distance A (A>E).

In the area laterally outside the main body joining part 80 (the area outside the widths B and E), the absorbent main body 10 and the waist member 20 are not joined, and it is difficult for them to interlock, so that the absorbent body The contractile force by the elastic member 50 (second outer elastic member 522) is likely to act on the side seat end portion 15t independently of the waist member 20. That is, even if the waist member 20 is pulled or deformed in response to the wearer's body movements when wearing the napkin 1, independent of the influence of such deformation of the waist member 20, The second elastic member 52 makes it easier for the side sheet end portion 15t to fit the wearer's skin. In particular, by improving the fit of the side seat end 15t in the crotch area Rc, where lateral leakage of excreted fluid is likely to occur, lateral leakage of excreted fluid, etc. is effectively suppressed and does not cause discomfort to the wearer. It can be made difficult.

Furthermore, in the crotch Rc of the absorbent main body 10, the distance between the inner ends 15tei, 15tei in the lateral direction of the side sheet end 15t is longer than the distance (width) in the lateral direction of the main body joint 80. It is desirable to have one. In FIG. 8, at least in the longitudinal rear side of the crotch Rc, the interval C in the lateral direction between the inner ends 5tei, 15tei of the side seat end portions 15t is longer than the width B in the lateral direction of the main body joint portion 80. (C>B).

As described above, it is difficult for the absorbent main body 10 and the waist member 20 to interlock in the area laterally outside the main body joint 80 (the area outside the width B), so in this area, the side sheet edge The portion 15t is easily deformed freely without being affected by the waist member 20. Therefore, it is possible to more easily fit the side sheet end portion 15t to the wearer's skin. Since the rear region of the crotch area has large body irregularities due to the roundness of the buttocks, it is possible to more easily suppress leakage of excretory fluid by improving the fit of the side seat end 15t in this region. can.

Similarly, in the rear side Rb of the absorbent main body 10, the distance between the inner ends 15tei, 15tei in the lateral direction of the side sheet end 15t is longer than the distance (width) in the lateral direction of the main body joint 80. It is desirable to have a part. In FIG. 8, the rear side portion Rb also has a portion where the interval C in the lateral direction between the inner ends 5tei, 15tei of the side seat end portions 15t is longer than the width B in the lateral direction of the main body joint portion 80. There is (C>B). Thereby, the fit of the side seat end portion 15t can be improved over a wide range of the rear side portion Rb where the buttocks are largely rounded.

Further, in the napkin 1, the absorbent core 11 has a narrow width in the lateral direction and has a constricted portion 11c. In FIG. 8, in the longitudinal center position CL and the region in front thereof, both sides of the absorbent core 11 in the left and right direction are provided with constricted parts 11c constricted inwardly in an arched shape. The provision of such a constricted portion 11c makes it difficult for the absorbent core 11 to interfere with the wearer's legs, making it easier to fit between the wearer's legs. In the vertical direction, at the position where the width of the absorbent core 11 in the horizontal direction is the narrowest (that is, the position of the narrowest part of the constriction part 11c), the width of the main body joint part 80 is smaller than the width of the absorbent core 11 in the horizontal direction. It is desirable that the width in the lateral direction is longer. In FIG. 8, the width D of the absorbent core 11 in the lateral direction is narrower than the width E of the main body joint 80 in the lateral direction at the most isthmic part of the constricted portion 11c (E>D).

With such a configuration, the entire horizontal direction of the absorbent core 11 is easily pressed against the wearer's skin in conjunction with the waist member 20 at the constricted portion 11c. That is, the absorbent core 11 can easily fit the wearer's crotch area (excretory opening). Thereby, leakage of excretory liquid is suppressed, and it is also possible to suppress the formation of a large gap between the excretion port and the absorbent core 11, which causes discomfort to the wearer.

In addition, in the crotch area of the napkin 1, the fiber density of the sheet member forming the side sheet 15 is the same as the fiber density of the sheet member forming the waist member 20 (non-skin side sheet 21, skin side sheets 22, 23). It is desirable that it be smaller than the density. In the napkin 1 of this embodiment, the side sheet 15 of the absorbent main body 10 is formed of a nonwoven fabric such as an air-through nonwoven fabric. On the other hand, the waist member 20 is formed of a nonwoven fabric such as a spunbond nonwoven fabric. By making the fiber density of the sheet member constituting the side sheet 15 (end portion 15t) smaller than the fiber density of the sheet member constituting the waist member 20, the side sheet 15 is more easily deformed flexibly than the waist member 20. , it can make the skin feel softer in the sensitive groin area. On the other hand, by increasing the fiber density of the waist member 20, the liquid retention property around the waist increases, making it easier to suppress leakage of excretory fluid to the outside of the napkin 1. Thereby, it can be made difficult to cause discomfort to the wearer.

Note that the fiber density of the sheet member constituting the side sheet 15 is the fiber density measured at the center position CL in the longitudinal direction of the crotch region Rc shown in FIG. Similarly, the fiber density of the sheet member constituting the waist member 20 is also the fiber density measured at the center position CL in the longitudinal direction. In this embodiment, the fiber density of the side sheet 15 and the fiber density of the non-skin side sheet 21 (waistline member 20) may be measured at the center position CL (see FIG. 3), and the two may be compared. However, if the width of the waist member 20 in the lateral direction is narrower than the width of the absorbent body 10 in the lateral direction, a sheet member that constitutes the waist member 20 is located laterally outside the absorbent body 10 at the center position CL. is not present, the fibers of the sheet member (waistline member 20) that are present laterally outside the absorbent main body 10 at any position in the vertical direction in the region included in the crotch Rc. The density may be measured and compared with the fiber density of the side sheet 15 measured at the center position CL.

Further, the sheet members constituting the side sheets 15 and the waist member 20 are all made of non-woven fabric, and the surface thereof is dotted with a plurality of embossing (squeezed parts) formed when manufacturing the non-woven fabric. . For example, in the process of manufacturing spunbond nonwoven fabric, a web formed by depositing long fibers is subjected to embossing such as thermocompression bonding, and then compressed in the thickness direction to bond the web into a sheet. In the napkin 1, the girth member 20 that is laminated in the thickness direction of the side sheet 15 is larger than the total area of the compressed parts provided per unit area of the sheet members that constitute the side sheet 15. It is desirable that the total area of the compressed parts provided per unit area of the sheet member is larger. With such a configuration, the unevenness on the surface of the side sheet 15 tends to be smaller than the unevenness on the surface of the waist member 20, and the surface of the side sheet 15 can be made smoother. Thereby, when the side sheet 15 comes into contact with the wearer's groin region, it is possible to prevent the wearer from feeling uncomfortable.

Further, as shown in FIG. 4, the length L51 in the vertical direction of the portion of the absorbent elastic member 50 on which the stretching force of the first elastic member 51 provided at the center in the lateral direction acts is It is longer than the length L52 in the vertical direction of the portion on which the elastic force of the second elastic member 52 provided in the section is applied (L51>L52). On both sides in the lateral direction, by shortening the length of the portion of the second elastic member 52 on which the elastic force acts (the effective length of the second elastic member 52), the second elastic member 52 bites into the protrusion of the buttocks. You can prevent this from happening. In addition, in the lateral central portion, by increasing the length of the portion of the first elastic member 51 on which the stretching force acts (the effective length of the first elastic member 51), a wide range in the longitudinal direction of the absorbent core 11 is extended. It can be made to fit snugly to the wearer's body. As a result, the absorbency of excretory fluid is improved, and discomfort and discomfort when wearing the napkin 1 can be reduced.

The absorbent elastic member 50 provided on the napkin 1 is arranged in a substantially straight line along the vertical direction, and has at least a convex portion (not shown) convex outward in the horizontal direction. do not have. If the absorbent elastic member 50 has a convex portion that protrudes outward in the lateral direction, the convex portion would interfere with the wearer's legs when the napkin 1 is worn, causing the wearer to feel uncomfortable or It tends to cause discomfort. On the other hand, in this embodiment, the absorbent elastic member 50 is provided in a straight line along the vertical direction, so that it is possible to suppress the wearer from feeling uncomfortable when wearing the napkin 1. .

===Second embodiment===
FIG. 9 is a plan view of the napkin 2 according to the second embodiment in a developed and stretched state, and corresponds to FIG. 2 of the first embodiment. The napkin 2 of the second embodiment is different from the napkin 1 of the first embodiment in a part of the structure of the waist member 20, and the structure other than the waist member 20 is substantially the same as the napkin 1. Below, parts different from the napkin 1 will be explained.

The girth member 20 of the napkin 2 has skin side sheets 27 and 28 provided on the skin side in the thickness direction of the non-skin side sheet 21, and between the non-skin side sheet 21 and the skin side sheets 27 and 28 in the thickness direction. A plurality of waist elastic members 26, 26, etc., such as thread rubber, are provided.

The waist elastic members 26 are joined between the non-skin side sheet 21 and the skin side sheets 27 and 28 in a state of being stretched in the left-right direction, and are provided in plurality at predetermined intervals in the vertical direction. The stretchability exhibited by the waist elastic member 26 gives the waistline member 20 stretchability in the left-right direction. That is, in the waistline member 20 of the napkin 2, the "waistline elastic region GER" is formed by the waistline elastic member 26. In addition, in the napkin 2, the expansion magnification when attaching the waist elastic member 26 to the waist member 20 is such that the stretching force per unit area of the waist elastic region GER in the napkin 2 is equal to the stretching force per unit area of the waist elastic region GER in the napkin 1. It is best to adjust it so that it is equal to the stretching force.

The skin-side sheet 27 is a member corresponding to the skin-side sheet 22 of the napkin 1, but unlike the skin-side sheet 22, it is formed of a nonwoven fabric that does not have elasticity (or has extremely low elasticity). Similarly, the skin-side sheet 28 is a member corresponding to the skin-side sheet 23 of the napkin 1, and is formed of a nonwoven fabric that does not have elasticity (or has extremely low elasticity). Specifically, it is a nonwoven fabric made of components such as PP (polypropylene), PE (polyethylene), and PET (polyethylene terephthalate), and does not have a stretchable component such as urethane.

The absorbent body 10 of the napkin 2 has the same configuration as the absorbent body 10 of the napkin 1 described in the first embodiment (see FIGS. 5 to 8). That is, in the napkin 2 as well, the central absorbent elastic member 51 (first absorbent elastic member 51) is arranged to overlap the absorbent core 11 when viewed in the thickness direction. On the other hand, the side absorbent elastic members 52 (second absorbent elastic members 52) are disposed laterally outward from the central absorbent elastic member 51, and are similar to the absorbent core 11 when viewed in the thickness direction. They are arranged so that they do not overlap. At least an elastic member having a higher elasticity than the second absorbent elastic member 52 is located closer to the skin than the backsheet 14 (liquid-impermeable film) and in a region that does not overlap with the absorbent core 11. Not provided.

Therefore, in the napkin 2 of the second embodiment as well, the elastic force of the first elastic member 51 allows the absorbent core 11 to easily fit snugly into the wearer's excretion opening, and the elastic force of the second elastic member 52 allows the absorbent core 11 to The area on the outside in the lateral direction (the side sheet end portion 15t) is more likely to fit snugly to the wearer's groin region. Thereby, side leakage of excretory fluid can be effectively suppressed. Further, an elastic member having a higher stretching force than the second elastic member is not provided in a region laterally outside the absorbent core 11 and closer to the skin than the backsheet 14 (liquid-impermeable film). . Therefore, the absorbent main body 10 is prevented from digging into the wearer's skin, and the wearer is less likely to feel uncomfortable.

===Others===
The above-described embodiments are provided to facilitate understanding of the present invention, and are not intended to be interpreted as limiting the present invention. It goes without saying that the present invention may be modified and improved without departing from its spirit, and that the present invention includes equivalents thereof.

In the above embodiment, a shorts-type napkin was described as an example of a shorts-type absorbent article, but the present invention is also applicable to other shorts-type absorbent articles other than napkins. It is. For example, it may be applied to shorts-type diapers, shorts-type absorbent pads, and the like.

In the above-described embodiment, the non-skin side sheet 21 is folded back toward the non-skin side at the upper end of the front waist portion 20f, or the front folded portion 30, or a separate sheet member, is used to attach the outside to the non-skin side of the front waist portion 20f. An example in which a sheet 30 is provided has been described. A frill was formed on the front waistline portion 20f by the sheet non-joining portion 32 of the outer sheet 30. On the other hand, in the rear waist portion 20b, a separate sheet member (such as a non-woven fabric) is laminated on the non-skin side of the non-skin side sheet 21 and a part of the sheet member is joined, so that the same outer side as the front waist portion 20f is formed. A sheet 30 (not shown) may be formed. The outer sheet 30 in the rear waist portion 20b also has the same configuration as the outer sheet 30 in the front waist portion 20f described above, so that a uniform and beautiful-shaped ruffle can be provided on the rear side (back side) of the napkin 1. It becomes possible to form.

1 napkin (first embodiment: shorts type napkin),
2 napkins (second embodiment: shorts type napkins),
1a Waist opening, 1b Leg opening,
10 absorbent body,
11 absorbent core, 11c constriction,
12 top sheet, 13 second sheet, 14 back sheet,
15 side sheet, 15t end, 15teо outer end, 15tei inner end,
15tu end skin side, 15td end non-skin side,
17 High density area,
20 Girth member (composite sheet),
20f front waist part, 20b rear waist part,
20we side joint,
21 Non-skin side sheet,
22 Skin side sheet (stretchable sheet),
23 Skin side sheet (stretchable sheet),
25 Upper end elastic member of waist circumference,
26 waist elastic member,
27 Skin side sheet,
28 Skin side sheet,
30 Outer sheet (front folded part),
31 sheet joint part, 32 sheet non-joint part, 33 temporary joint part,
40 Rear folding part,
41 Rear sheet joint portion, 42 Rear sheet non-joint portion,
50 absorbent elastic member,
51 central absorber elastic member (first absorber elastic member, first elastic member),
52 Absorbent elastic member on both sides (second absorbent elastic member, second elastic member),
521 inner second elastic member, 522 outer second elastic member,
60 Welded part,
71 side seat joint,
75 outer end joint; 76 inner end joint;
80 Main body joint,
GER girth elastic region,
CL center position,
Rf front side, Rc crotch area, Rb rear side

Claims (16)

It has a vertical direction, a horizontal direction, and a thickness direction that intersect with each other in the unfolded state,
An absorbent body comprising a liquid-absorbent absorbent core and a liquid-impermeable film provided on the non-skin side of the absorbent core;
a waist member provided on the non-skin side of the absorbent main body;
A shorts-type napkin comprising:
The absorbent main body is provided on the non-skin side of the liquid-impermeable film and has a plurality of absorbent elastic members that expand and contract along the longitudinal direction,
The absorbent elastic member is
a first absorbent elastic member disposed at the center in the lateral direction and overlapping with the absorbent core when viewed in the thickness direction;
a second absorbent elastic member that is disposed outside the first absorbent elastic member in the lateral direction and does not overlap with the absorbent core when viewed in the thickness direction;
has
In a portion that is closer to the skin than the liquid-impermeable film and that does not overlap with the absorbent core when viewed in the thickness direction, the force when stretched by a unit length in the longitudinal direction is No elastic member larger than the second absorbent elastic member is provided;
comprising a main body joint part that joins the absorbent main body and the waist member,
The second absorbent elastic member disposed on the most one side in the lateral direction, and the second absorbent elastic member disposed on the other most side in the lateral direction, when viewed in the thickness direction. A shorts-type napkin, characterized in that it has a portion that overlaps the main body joint . The shorts-type napkin according to claim 1,
A shorts type characterized in that an elastic member is not provided in a portion that is closer to the skin than the liquid-impermeable film and that does not overlap with the absorbent core when viewed in the thickness direction. napkin. The shorts-type napkin according to claim 1 or 2,
having side sheets closer to the skin in the thickness direction than the liquid-impermeable film and on both sides of the absorbent main body in the lateral direction;
A shorts-type napkin characterized in that no elastic member is provided between the skin-side surface of the side sheet and the liquid-impermeable film in the thickness direction. The shorts-type napkin according to claim 3,
The shorts-type napkin characterized in that the side sheet and the second absorbent elastic member have an overlapping portion when viewed in the thickness direction. The shorts-type napkin according to claim 3,
The second absorbent elastic member includes a second inner elastic member and a second outer elastic member disposed on the outer side of the second inner elastic member in the lateral direction,
The number of sheet members stacked on the skin side in the thickness direction of the inner second elastic member is greater than the number of sheet members stacked on the skin side in the thickness direction of the outer second elastic member. A shorts-shaped napkin that is characterized by a lot of things. The shorts-type napkin according to claim 3,
The shorts-type napkin is characterized in that, in the lateral direction, an inner end of the side sheet is located outside an outer end of the absorbent core. The shorts-type napkin according to claim 3,
In the lateral direction, between the inner end of the side sheet and the outer end of the side sheet, a non-joined part where the side sheet is not joined to another sheet member facing the non-skin side of the side sheet. A shorts-shaped napkin characterized by having. The shorts-type napkin according to claim 7,
A side sheet joint portion is provided inside the non-joint portion in the lateral direction, and the side sheet is joined to another sheet member facing the non-skin side of the side sheet;
A shorts-type napkin characterized in that, in the lateral direction, the width of the non-joined portion is greater than the distance between the inner end of the side sheet joint portion and the inner end of the side sheet. The shorts-type napkin according to claim 3 ,
The waist member has a front waist portion and a rear waist portion,
a pair of side joint parts that join the front waist part and the rear waist part to each other at both ends in the lateral direction;
In the longitudinal direction, when the region between the side joint part provided on the front waist part and the side joint part provided on the rear waist part is defined as the crotch part,
In the crotch area, the lateral area between the second absorbent elastic member disposed on the one side in the lateral direction and the second absorbent elastic member disposed on the other side in the lateral direction A shorts-type napkin, characterized in that the shorts-type napkin has a portion whose distance in the direction is longer than the width of the main body joint in the lateral direction. The shorts-type napkin according to claim 9,
In the crotch area, the distance in the lateral direction between the inner end of the side sheet located on one side in the lateral direction and the inner end of the side sheet located on the other side in the lateral direction is A shorts-type napkin, characterized in that it has a portion that is longer than the width of the main body joint in the lateral direction. The shorts-type napkin according to claim 9,
At the rear side of the rear side of the crotch area in the longitudinal direction, an inner end of the side sheet disposed on one side in the transverse direction and an inner end of the side seat disposed on the other side in the transverse direction. A shorts-type napkin, characterized in that the shorts-type napkin has a portion in which the distance in the lateral direction from the inner end is longer than the width of the main body joint in the lateral direction. The shorts-type napkin according to claim 9,
In the vertical direction, at a position where the width of the absorbent core in the horizontal direction is the narrowest, the width of the main body joint in the horizontal direction is longer than the width of the absorbent core in the horizontal direction. A shorts-shaped napkin that is characterized by: The shorts-type napkin according to claim 3,
The waist member has a front waist portion and a rear waist portion,
a pair of side joint parts that join the front waist part and the rear waist part to each other at both ends in the lateral direction;
In the longitudinal direction, when the region between the side joint part provided on the front waist part and the side joint part provided on the rear waist part is defined as the crotch part,
In the shorts-type napkin, the fiber density of the sheet member constituting the side sheet in the crotch region is smaller than the fiber density of the sheet member constituting the waist member. The shorts-type napkin according to claim 3,
A plurality of compression portions are provided in each of the sheet member constituting the side seat and the sheet member constituting the waist member,
The total area of the compressed portions provided per unit area of the sheet members constituting the side sheets is: A shorts-type napkin characterized in that the area is smaller than the total area of the compressed portions provided. The shorts-type napkin according to claim 1 or 2,
The length in the longitudinal direction of the portion of the first absorbent elastic member on which the stretching force acts is longer than the length in the longitudinal direction of the portion of the second absorbent elastic member on which the stretching force acts. A shorts-shaped napkin. The shorts-type napkin according to claim 1 or 2,
The shorts-type napkin characterized in that the absorbent elastic member does not have a convex portion that is convex outward in the lateral direction.

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