CN113573677A

CN113573677A - Absorbent article

Info

Publication number: CN113573677A
Application number: CN202080021807.7A
Authority: CN
Inventors: 槙秀晃; 长田和树; 椎野洋大; 藤井敬司
Original assignee: Unicharm Corp
Current assignee: Unicharm Corp
Priority date: 2019-03-20
Filing date: 2020-03-04
Publication date: 2021-10-29
Also published as: WO2020189280A1; JP6810765B2; JP2020151253A

Abstract

An absorbent article (1) in which at least one waist portion (20) of a pair of waist portions has a pair of sheets (21, 22) and stretchable members (231), each stretchable member (231) is continuously arranged from one end portion to the other end portion in the width direction of the one waist portion (20), and has a pair of end portion fixing portions (50) in which both end portions in the width direction are fixed to the pair of sheets (21, 22), and the plurality of stretchable members (231) have: a 1 st extensible member (231a) having a non-fixed portion (51) that is not fixed to the pair of sheets (21, 22) at a position further toward the inside in the width direction than the end portion fixed portion (50); and a 2 nd stretch member (231b) which has a central fixing section (52) fixed to the pair of sheets (21, 22) at least over the entire region of the region overlapping the absorbent core (11A) in the width direction, and which is disposed in a region overlapping the absorbent body (10) in the longitudinal direction.

Description

Absorbent article

Technical Field

The present invention relates to an absorbent article.

Background

As a stretchable structure of a waist portion of an absorbent article, there is a structure including an elongated elastic stretchable member provided along a stretching direction between two sheet layers. For example, patent document 1 discloses such a telescopic structure: the elastic member has both end portions fixed to the two sheet layers, and is a free portion not fixed to the two sheet layers between the fixed end portions, and has a sheet joining portion in which the two sheet layers are joined by a hot melt adhesive in a region between the fixed end portions. The two sheet layers are formed into a wavy shape (wrinkle) such that they follow each other by the sheet joining portion continuing in the stretching direction, and the top of the wrinkle is gently curved, with the result that the touch becomes soft.

Documents of the prior art

Patent document

Patent document 1: japanese patent No. 6254625

Disclosure of Invention

Problems to be solved by the invention

In an absorbent article, an absorbent body having an absorbent core is generally disposed on the skin side of a waist portion, and the skin side sheet layer of two sheet layers is fixed to the absorbent body. In addition, the stretchable structure of the waist portion is required to have flexibility with good touch. However, in the case of applying the stretchable structure of patent document 1 to the waist portion, the elastic stretchable member is not fixed to the two sheet layers in the region where the waist portion and the absorbent core overlap in the width direction. Therefore, the sheet layer and the absorbent core that are not fixed to the skin side of the elastic stretchable member are likely to be displaced in the vertical direction with respect to the position where the elastic stretchable member is in close contact with the wearer. If the fixation of the absorbent core to the wearer is insufficient in this way, leakage of excrement may occur.

The present invention has been made in view of the above-described problems, and an object thereof is to improve flexibility of a waist portion of an absorbent article and to suppress displacement of an absorbent core.

Means for solving the problems

A main technical means for achieving the above object is an absorbent article having a pair of waist portions and an absorbent body including an absorbent core, in a developed state, the absorbent article having a width direction and a length direction, wherein at least one of the pair of waist portions has a pair of sheets and a plurality of stretchable members arranged between the pair of sheets and stretchable in the width direction, each of the stretchable members is continuously arranged from one end portion to the other end portion in the width direction of the waist portion and has a pair of end fixing portions in which both end portions in the width direction are fixed to the pair of sheets, the plurality of stretchable members has a 1 st stretchable member and a 2 nd stretchable member, the 1 st stretchable member has a non-fixing portion which is not fixed to the pair of sheets at a position on an inner side in the width direction than the end fixing portions, the 2 nd stretchable member has a central fixing portion fixed to the pair of sheets at least over an entire region of a region overlapping the absorbent core in the width direction, and is disposed in a region overlapping the absorbent body in the longitudinal direction.

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

Invention of the inventionEffect of (1)

According to the present invention, it is possible to suppress displacement of the absorbent core while improving flexibility of the waist portion of the absorbent article.

Drawings

Fig. 1 is a schematic perspective view of a pants-type disposable diaper 1.

Fig. 2 is a schematic plan view of the diaper 1 in an unfolded and extended state.

Fig. 3 is a schematic sectional view taken along line II of fig. 2.

Fig. 4 is a schematic plan view of the abdomen-side waist portion 20 according to embodiment 1.

Fig. 5 is a schematic plan view of an abdomen-side waist portion 20 according to modification 1.

Fig. 6 is a schematic plan view of an abdomen-side waist portion 20 according to modification 2.

Fig. 7 is a schematic plan view of the abdomen-side waist portion 20 according to embodiment 2.

Fig. 8 is a schematic plan view of the abdomen-side waist portion 20 according to embodiment 3.

Fig. 9 is a schematic plan view of the abdomen-side waist portion 20 according to embodiment 3.

Fig. 10 is a schematic plan view of the abdomen-side waist portion 20 according to embodiment 3.

Fig. 11 is a schematic perspective view showing an example of the

sheets

21 and 22 having a plurality of holes 25.

Detailed Description

At least the following matters will become clear from the description of the present specification and the accompanying drawings.

That is, an absorbent article having a pair of waist portions and an absorbent body including an absorbent core in an unfolded state, wherein at least one of the pair of waist portions has a pair of sheets and a plurality of stretchable members arranged between the pair of sheets and stretchable in the width direction, each of the stretchable members is continuously arranged from one end portion to the other end portion in the width direction of the waist portion and has a pair of end fixing portions in which both end portions in the width direction are fixed to the pair of sheets, the plurality of stretchable members include a 1 st stretchable member and a 2 nd stretchable member, the 1 st stretchable member has a non-fixing portion which is not fixed to the pair of sheets at a position on an inner side in the width direction than the end fixing portions, and the 2 nd stretchable member has a non-fixing portion which is not fixed to the pair of sheets at least in an entire region of a region overlapping with the absorbent core in the width direction The field has a central fixing portion fixed to the pair of sheets and is disposed in a region overlapping the absorbent body in the longitudinal direction.

According to such an absorbent article, the flexibility of the waist region can be improved by the non-fixing portion of the 1 st extensible member, and the displacement of the absorbent core can be suppressed by the central fixing portion of the 2 nd extensible member.

In the absorbent article, the plurality of extensible members includes a plurality of the 2 nd extensible members.

According to such an absorbent article, the displacement of the absorbent core can be further suppressed by the central fixing portions of the plurality of 2 nd stretch members.

In the absorbent article, the plurality of extensible members includes a plurality of the 1 st extensible member.

According to such an absorbent article, the flexibility of the waist portion can be further improved by the non-fixing portions of the plurality of 1 st extensible members.

In the absorbent article, at least one of the 2 nd stretch members is disposed in a region overlapping the absorbent core in the longitudinal direction.

According to such an absorbent article, the absorbent core can be easily fixed to the position where the 2 nd stretch member is in close contact with the wearer, and the displacement of the absorbent core can be further suppressed.

In the absorbent article, at least one of the 2 nd extensible members has a non-fixed portion that is not fixed to the pair of sheets between the end portion fixed portion and the center fixed portion in the width direction.

According to such an absorbent article, the flexibility of the waist portion can be further improved by the non-fixing portion of the 2 nd extensible member.

In the absorbent article, the center fixing portion of at least one of the 2 nd extensible members is continuously arranged from the end fixing portion on one side in the width direction to the end fixing portion on the other side.

According to such an absorbent article, the absorbent body can be easily fixed to the position where the 2 nd stretch member is in close contact with the wearer, and the displacement of the absorbent core can be further suppressed.

In the absorbent article, the non-fixed portion of at least one of the 1 st extensible members is disposed over at least the entire region of the region overlapping the absorbent core in the width direction.

According to such an absorbent article, the flexibility of the central portion in the width direction of the waist portion can be improved.

In the absorbent article, the stretchable members other than the 1 st stretchable member among the plurality of stretchable members are the 2 nd stretchable member, all of the 1 st stretchable members have a central fixing portion fixed to the pair of sheets at least over the entire region of the region overlapping the absorbent core in the width direction, and all of the 2 nd stretchable members have the non-fixing portion.

According to such an absorbent article, the flexibility of the waist portion can be improved and the displacement of the absorbent core can be suppressed. Further, the central fixing portion facilitates the maintenance of the distance in the longitudinal direction of the stretchable member, and stretchability can be provided over a wide range of the waist portion.

In the absorbent article, the length in the width direction of the central fixing portion of each of all the 1 st and 2 nd extensible members is equal.

According to such an absorbent article, the formation of the central fixing portion is facilitated.

In the absorbent article, a length in the width direction of a region between the end fixing portion on one side and the end fixing portion on the other side in the width direction is longer than a length in the width direction of the absorbent main body.

According to such an absorbent article, the length of the end fixing portions is shortened, and the flexibility of the waist portion can be improved.

In the absorbent article, the one waist portion does not include a 1 st sheet joint portion, the 1 st sheet joint portion is a sheet joint portion that joins the pair of sheets to each other at a position on the inner side in the width direction than the end fixing portion, and the 1 st sheet joint portion is disposed so as not to intersect with a portion where the stretchable member is fixed to the pair of sheets at a position on the inner side in the width direction than the end fixing portion.

According to such an absorbent article, the flexibility of the waist portion can be improved as compared with the case where the waist portion has the 1 st sheet joining portion.

In the absorbent article, the one waist portion includes a 2 nd sheet joining portion that joins the pair of sheets to each other at a position further inward in the width direction than the end fixing portion.

According to such an absorbent article, the second sheet joining portion can suppress the lifting of the sheet when the stretchable member is contracted, and the appearance of the absorbent article can be improved.

In the absorbent article, the 2 nd sheet joining portion extends longer in the width direction than in the longitudinal direction, and is disposed at a distance in the longitudinal direction from a portion where the stretchable member is fixed to the pair of sheets at a position inward in the width direction of the end fixing portion.

According to such an absorbent article, when the stretchable member is contracted, relatively fine longitudinal gathers are easily formed by the 2 nd sheet joint, and the appearance of the absorbent article can be improved.

In the absorbent article, the 2 nd sheet joining section is disposed on the outer side in the width direction of the absorbent core.

According to such an absorbent article, the flexibility of the waist portion can be improved by shortening the length of the sheet joining portion in the width direction as much as possible.

In the pants-type absorbent article, a plurality of through-holes are provided at intervals in at least one of the pair of sheets, and the waist portion has a portion where a region provided with the non-fixing portion overlaps a region provided with the through-holes.

According to such a pants-type absorbent article, since the opening is provided in the region of the waist portion that overlaps with the non-fixing portion having high flexibility, the influence of the hardening of the outer peripheral edge portion of the opening is relatively reduced, and the stiffening of the feel of the waist portion can be suppressed. Further, since no adhesive is provided in the non-fixed portion, the wearer is less likely to feel the sticky feeling of the adhesive through the openings. Therefore, the flexibility and air permeability of the waist portion can be improved without giving a wearer a sense of discomfort.

Embodiments of the present invention are described in detail below with reference to the accompanying drawings

Hereinafter, the embodiments will be described by taking, as an absorbent article of the present invention, an underpants type disposable diaper for infants. However, the absorbent article of the present invention is not limited to the above-described article, and can be applied to pants-type disposable diapers for adults, disposable diapers for tapes, and sanitary shorts.

The disposable diaper 1 of the underpants type has a structure of one piece

Fig. 1 is a schematic perspective view of a pants-type disposable diaper 1 (hereinafter, referred to as "diaper"). Fig. 2 is a schematic plan view of the diaper 1 in an unfolded and extended state. Fig. 3 is a schematic sectional view taken along line II of fig. 2. The "developed state" of the pants-type diaper refers to a state in which the engagement of the locking portions 40 described later is released, the pair of

waist portions

20 and 30 are separated, and the diaper 1 is opened in the longitudinal direction.

The diaper 1 has a width direction, a vertical direction, and a front-rear direction in an underpants type state shown in fig. 1, and is formed with a waist opening BH and a pair of leg openings LH. In the up-down direction, the waist side is an upper side, and the crotch side is a lower side. In the front-rear direction, the abdomen side of the wearer is referred to as the front side, and the back side of the wearer is referred to as the rear side. As shown in fig. 3, the direction in which the materials constituting the diaper 1 are laminated is referred to as the thickness direction, and the side that contacts the wearer is the skin side and the side that does not contact the wearer is the non-skin side in the thickness direction.

The diaper 1 further includes an absorbent main body 10 and a pair of

waist portions

20 and 30. Of the pair of

waist portions

20 and 30, a portion that is attached to the abdomen side of the wearer is referred to as an abdomen side waist portion 20, and a portion that is attached to the back side of the wearer is referred to as a back side waist portion 30.

In addition, the diaper 1 has a width direction and a longitudinal direction in the developed state shown in fig. 2, and has one longitudinal-direction end portion of the absorbent body 10 disposed in a width-direction central portion of the abdomen-side waistline portion 20, and the other longitudinal-direction end portion of the absorbent body 10 disposed in a width-direction central portion of the back-side waistline portion 30. In the diaper 1 in the developed state, the absorbent body 10 is folded in two at substantially the center in the longitudinal direction thereof, and both side portions in the width direction of each of the abdomen-side waistline portion 20 and the back-side waistline portion 30 are locked at the pair of locking portions 40, so that the diaper 1 in the pants-type state shown in fig. 1 is obtained. The longitudinal direction of the diaper 1 in the developed state is along the vertical direction of the diaper 1 in the pants-type state. As a method of locking the locking portion 40, welding, bonding with an adhesive, or the like can be exemplified.

As shown in fig. 3, the absorbent main body 10 includes an absorbent body 11, a liquid-permeable top sheet 12 disposed on the skin side of the absorbent body 11, a liquid-impermeable back sheet 13 disposed on the non-skin side of the absorbent body 11, and an outer sheet 14 disposed on the non-skin side of the back sheet 13.

As shown in fig. 2, the absorbent body 11 has an absorbent core 11A that absorbs and retains excretory fluid such as urine, and a liquid-permeable core wrap 11B that covers the absorbent core 11A. As the absorbent core 11A, an absorbent core in which liquid absorbent fibers such as pulp containing a Super Absorbent Polymer (SAP) are molded into a predetermined shape can be exemplified. The absorbent core 11A may not be covered with the core wrap sheet 11B.

As shown in fig. 2, leg hole stretch members 15 are provided on both sides in the width direction of the absorbent main body 10, and the diaper 1 is fitted around the leg holes of the wearer.

As shown in fig. 3, the abdomen-side waistline portion 20 and the back-side waistline portion 30 each include a soft

skin side sheet

21, 31 and a non-skin side sheet 22, 32 (a pair of sheets) such as a nonwoven fabric, and a plurality of

waistline stretch members

23, 33 arranged between the

skin side sheets

21, 31 and the

non-skin side sheets

22, 32 and stretching in the width direction. The plurality of waist

stretchable members

23, 33 are arranged at intervals in the vertical direction (longitudinal direction) between the

skin side sheets

21, 31 and the

non-skin side sheets

22, 32, and are fixed in an extended state in the width direction. Thereby, the abdomen-side waistline portion 20 and the back-side waistline portion 30 are stretched in the width direction and fit to the waistline of the wearer. As the waist

stretchable members

23 and 33, a string-like stretchable member such as an elastic thread or an elongated stretchable sheet can be exemplified. The configuration of the

waist portions

20 and 30 is not limited to the illustrated embodiment, and may be, for example, a configuration in which three or more layers of different sheets are stacked on a pair of sheets, or a configuration in which one sheet is folded to form a pair of sheets.

In the present embodiment, the pull-up type disposable diaper is illustrated as a so-called three-piece type in which the abdomen-side waist portion 20 and the back-side waist portion 30 are separated from each other and the three members of the abdomen-side waist portion 20, the back-side waist portion 30, and the absorbent body 10 are provided, but the present invention is not limited thereto. For example, the disposable diaper may be a so-called two-piece pants-type disposable diaper including two members, i.e., an outer covering member and an absorbent body, in which the outer covering member is formed of one continuous member in which the abdomen-side waistline portion 20 and the back-side waistline portion 30 are continuous via the crotch portion, and the outer covering member is formed by integrating the abdomen-side waistline portion 20 and the back-side waistline portion 30.

The

waist unit

20, 30 is defined as one of the two waist units

(embodiment 1)

Fig. 4 is a schematic plan view of the abdomen-side waist portion 20 according to embodiment 1. Fig. 5 is a schematic plan view of an abdomen-side waist portion 20 according to modification 1. Fig. 6 is a schematic plan view of an abdomen-side waist portion 20 according to modification 2.

The configuration of the pair of

waist portions

20 and 30 will be described below by taking the abdomen-side waist portion 20 as an example. However, at least one of the pair of

waistline portions

20, 30 may have the following configuration. That is, both the

waist portions

20 and 30 may have the following configurations, the abdomen-side waist portion 20 may have the following configuration and the back-side waist portion 30 may have the following configuration, or the abdomen-side waist portion 20 may have the following configuration and the back-side waist portion 30 may have the following configuration. The same applies to other embodiments.

The waist stretchable members 23 included in the abdomen-side waist portion 20 (hereinafter referred to as "waist portion 20") include a plurality of "continuous stretchable members 231 (stretchable members according to the present invention)" continuously arranged from one end portion to the other end portion in the width direction of the waist portion 20, and a plurality of "discontinuous stretchable members 232" discontinuously arranged in the width direction. The discontinuous extensible member 232 is disposed below the continuous extensible member 231.

Each of the continuously stretchable members 231 has "a pair of end fixing portions 50" in which both end portions in the width direction are fixed to the skin-side sheet 21 and the non-skin-side sheet 22. The method of fixing the end fixing portion 50 is not particularly limited, and for example, known methods such as fixing with an adhesive applied to the continuous stretchable member 231, fixing with an adhesive applied to the inner surfaces of the skin side sheet 21 and the non-skin side sheet 22 (hereinafter, "pair of

sheets

21, 22"), and fixing with a pair of fusion-bonded portions crossing the continuous stretchable member 231 can be illustrated.

In fig. 4, the pair of end fixing portions 50 are arranged on the inner side in the width direction of the pair of locking portions 40 independently of the pair of locking portions 40. But is not limited thereto. The pair of locking portions 40 may be a pair of end fixing portions. That is, the diaper 1 may not have the end fixing portions 50 shown in fig. 4.

In addition, the plurality of continuously extendable members 231 has a plurality of "1 st continuously extendable member 231 a". The 1 st continuous stretchable member 231a (the 1 st stretchable member of the present invention) has the "non-fixed portion 51" which is not fixed to the pair of

sheets

21, 22 at a position further inward in the width direction than the end fixing portion 50. In embodiment 1 (fig. 4), the non-fixed portion 51 is continuously arranged from one end portion fixed portion 50 to the other end portion fixed portion 50 in the width direction.

The waist stretchable member 23 has higher rigidity in a portion fixed to the pair of

sheets

21 and 22 than in a portion not fixed to the pair of

sheets

21 and 22 due to curing of the adhesive or the like. Therefore, since the 1 st continuous stretchable member 231a has the non-fixed portion 51, the area of the portion having high rigidity can be reduced as compared with, for example, a case where the waist stretchable member 23 is fixed to the pair of

sheets

21, 22 over substantially the entire region. This can improve the flexibility of the waist portion 20, and can optimize the wearing comfort of the waist portion 20.

It is assumed that all the continuous extensible members 231 are the 1 st continuous extensible member 231a shown in fig. 4. In this way, in the region R1 where the waist unit 20 and the absorbent core 11A overlap in the width direction, the continuous stretchable member 231 is not fixed to the pair of

sheets

21, 22 at all. Therefore, the skin side sheet 21 and the absorbent core 11A indirectly fixed to the skin side sheet 21 can move in the vertical direction with respect to the continuously stretchable member 231. In this case, the skin side sheet 21 and the absorbent core 11A are displaced in the vertical direction from the position where the continuously stretchable member 231 comes into close contact with the wearer, and the absorbent core 11A is insufficiently fixed to the wearer. As a result, the excrement is likely to leak, and the wearing comfort of the diaper 1 is reduced.

Therefore, the plurality of continuous telescopic members 231 has "2 nd continuous telescopic member 231 b". The 2 nd continuous stretchable member 231b (the 2 nd stretchable member of the present invention) has the "central fixing portion 52" fixed to the pair of

sheets

21, 22 at least over the entire region of the region R1 overlapping with the absorbent core 11A in the width direction, and is disposed in a region overlapping with the absorbent main body 10 in the longitudinal direction.

By doing so, the 2 nd continuous stretchable member 231b overlapping the absorbent main body 10 in the front-rear direction (thickness direction) of the diaper 1 is fixed to the skin-side sheet 21. In addition, the 2 nd continuous stretchable member 231b is fixed to the skin side sheet 21 at least in the region R1 where the absorbent core 11A exists in the width direction. Accordingly, the skin-side sheet 21 is also fixed to the position where the 2 nd continuous stretchable member 231b is in close contact with the wearer, and the absorbent core 11A indirectly fixed to the skin-side sheet 21 is less likely to be displaced in the vertical direction. As a result, the fit of the absorbent core 11A to the wearer increases, and the leakage of excrement is less likely to occur, thereby improving the wearing comfort of the diaper 1.

In particular, in embodiment 1 (fig. 4), the center fixing portion 52 of the 2 nd continuous extensible member 231b is continuously arranged from one end fixing portion 50 to the other end fixing portion 50 in the width direction. When the center fixing portion 52 extends long beyond the range R2 where the absorbent main body 10 exists in the width direction in this way, the skin-side sheet 21 and the absorbent main body 10 are also fixed to the position where the 2 nd continuous stretchable member 231b is in close contact with the wearer. Since the absorbent main body 10 is less likely to be displaced in the vertical direction, the absorbent core 11A included in the absorbent main body 10 is less likely to be displaced in the vertical direction.

But is not limited to the above. The central fixing portion 52 of the 2 nd continuous stretchable member 231 may be disposed at least in the range R1 where the absorbent core 11A is present in the width direction. Therefore, for example, as in modification 2 (fig. 6), the 2 nd continuous stretchable member 231b may have the non-fixing portion 53 which is not fixed to the pair of sheets between the end fixing portion 50 and the center fixing portion 52 in the width direction. By thus shortening the length of the central fixing portion 52 in the width direction, the area of the portion with high rigidity can be reduced, and the flexibility of the waistline portion 20 can be improved. In particular, as shown in fig. 6, the flexibility of the waist portion 20 can be further improved by matching the position of the side edge of the absorbent core 11A in the width direction with the position of the side edge of the central fixing portion 52 in the width direction.

Although the non-fixed portions 53 are disposed on both sides of the center fixed portion 52 in the modification 2 (fig. 6), the non-fixed portions 53 may be disposed only on one side of the center fixed portion 52 (not shown). That is, the end fixing portion 50 and the center fixing portion 52 on one side in the width direction may be continuous, or the end fixing portion 50 and the center fixing portion 52 on the other side in the width direction may be continuous.

The plurality of continuous extensible members 231 may include at least one 2 nd continuous extensible member 231 b. By doing so, the vertical displacement of the absorbent core 11A can be suppressed. In embodiment 1 (fig. 4), the continuous extensible member other than the 2 nd continuous extensible member 231b among the plurality of continuous extensible members 231 becomes the 1 st continuous extensible member 231 a.

In this way, it is preferable that the plurality of continuously extendable members 231 have a plurality of 1 st continuously extendable members 231 a. By increasing the number of the 1 st continuous extensible member 231a having the non-fixed portion 51, the area of the portion having high rigidity can be reduced. This can further improve the flexibility of the waist unit 20.

However, the present invention is not limited to the above embodiment. As in modification 1 (fig. 5), the plurality of continuous extensible members 231 may have a plurality of 2 nd continuous extensible members 231 b. By doing so, the skin-side sheet 21 is also fixed to the position where the plurality of 2 nd continuous stretchable members 231b are in close contact with the wearer. Therefore, the vertical displacement of the absorbent core 11A can be further suppressed. When there are a plurality of the 2 nd continuous extensible members 231b, the length of the center fixing portion 52 in the width direction may be different (not shown).

The central fixing portion 52 of the absorbent body 10 and the 2 nd continuous stretchable member 231b is located at the widthwise central portion of the waist portion 20. Therefore, the wearer can easily feel the hardness of the widthwise central portion of the waist portion 20. Therefore, as in embodiment 1 (fig. 4), the non-fixed section 51 of the 1 st continuous stretchable member 231A may be disposed at least over the entire region of the region R1 overlapping with the absorbent core 11A in the width direction. By doing so, flexibility can be imparted to the widthwise central portion of the waist portion 20, and wearing comfort can be improved.

In particular, in embodiment 1 (fig. 4), the non-fixed portion 51 of the 1 st continuous extensible member 231a extends continuously and long from the end fixed portion 50 on one side in the width direction to the end fixed portion 50 on the other side. This can further improve the flexibility of the waist unit 20.

As in embodiment 1 (fig. 4), the lowermost (longitudinally inward) continuous extensible member 231 may be the 2 nd continuous extensible member 231 b. By doing so, the 2 nd continuous stretchable member 231b closest to the absorbent core 11A in the up-down direction is fixed to the skin side sheet 21. Therefore, the absorbent core 11A is less likely to be vertically displaced from the position where the 2 nd continuous stretchable member 231b is in close contact with the wearer. However, the present invention is not limited to the above embodiment, and the 2 nd continuous stretchable member 231b may be located above the continuous stretchable member 231 located at the lowermost position as in modification 2 (fig. 6).

As in modification 1 (fig. 5), at least one 2 nd continuous stretchable member 231b may be disposed in a region overlapping the absorbent core 11A in the vertical direction (longitudinal direction). By doing so, the skin side sheet 21 and the absorbent core 11A are fixed at a position where the 2 nd continuous stretchable member 231b is in close contact with the wearer. Therefore, the vertical displacement of the absorbent core 11A can be further suppressed.

Further, as shown in fig. 4, the width direction length W1 of the region between the one end fixing portion 50 and the other end fixing portion 50 in the width direction (between the inner edges of the pair of end fixing portions 50) is preferably longer than the width direction length W2 of the absorbent main body 10 (W1 > W2). By thus making the length of the end fixing portions 50 in the width direction relatively short, the flexibility of the waist portion 20 can be improved.

When the lengths W1 and W2 in the width direction are compared, the diaper 1 is preferably stretched without wrinkles. Specifically, the waist unit 20 is stretched to a length at which the dimension of the member (for example, the skin side sheet 21) is equal to or close to the dimension of the member alone.

In addition, the plurality of continuous extensible members 231 may have a continuous extensible member 231 other than the 1 st continuous extensible member 231a and the 2 nd continuous extensible member 231 b. For example, as in modification 1 (fig. 5), the 3 rd continuous stretchable member 231c having no non-fixed portion 51 may be disposed in a region outside the absorbent main body 10 in the longitudinal direction. That is, the 3 rd continuous stretchable member 231c has the central fixing portion 54 continuously fixed to the pair of

sheets

21, 22 from the end fixing portion 50 on one side in the width direction to the end fixing portion 50 on the other side.

In this case as well, the skin-side sheet 21 is fixed to the position where the 3 rd continuous stretchable member 231c is in close contact with the wearer in the region R1 where the absorbent core 11A is present in the width direction. Therefore, the absorbent core 11A is less likely to be displaced in the vertical direction. The number of the 3 rd continuous telescopic members 231c may be single or plural.

As shown in fig. 4, the waist unit 20 includes the discontinuous extensible member 232 below (inward in the longitudinal direction) the 2 nd continuous extensible member 213 b. The discontinuous extensible member 232 is discontinuous at least in part in the region R1 overlapping with the absorbent core 11A in the width direction. That is, a part of the waist stretchable member 23 overlapping the absorbent body 10 in the longitudinal direction has a non-stretchable region (discontinuous portion) in the central part in the width direction. Therefore, the contraction of the absorbent core 11A by the waist stretchable member 23 can be suppressed, and the flatness of the absorbent core 11A can be ensured.

The discontinuous extensible member 232 may have an end fixing portion 55 and a non-fixing portion 56. The end fixing portions 55 are portions where both ends in the width direction of the continuous portion of the non-continuous stretchable member 232 are fixed to the pair of

sheets

21, 22. The non-fixed portion 56 is a portion where the non-continuous stretchable member 232 is not fixed to the pair of

sheets

21, 22 between the end fixing portions 55. Specifically, as shown in fig. 4, a pair of end fixing portions 55 are disposed at one end in the width direction of the waist portion 20 and one end in the width direction of the absorbent core 11A, a non-fixing portion 56 is disposed between the pair of end fixing portions 55, a pair of end fixing portions 55 are disposed at the other end in the width direction of the absorbent core 11A and the other end in the width direction of the waist portion 20, and the non-fixing portion 56 is disposed between the pair of end fixing portions 55.

By providing the non-continuous stretchable member 232 with the non-fixed portion 56, the flexibility of the waist portion 20 is improved. However, the present invention is not limited to the above-described embodiment, and the non-continuous extensible member 232 may not have the non-fixed portion 56. The waist unit 20 may not have the discontinuous extensible member 232.

The waist portion 20 of embodiment 1 does not have a sheet joining portion for joining the pair of

sheets

21 and 22 to each other at a position inward in the width direction of the end fixing portion 50. The sheet joining portion (the 1 st sheet joining portion in the present invention) is a portion which is disposed at a distance in the vertical direction (longitudinal direction) from a portion where the continuous stretchable member 231 is fixed to the pair of

sheets

21 and 22 at a position inward in the width direction from the end fixing portion 50 (for example, a portion where the pair of

sheets

21 and 22 are joined with the waist stretchable member 23 sandwiched between the center fixing portions 52 and 54). That is, the sheet joining portion is a portion which is not disposed so as to intersect the waist stretchable member 23, and is a portion in which the opposing surfaces of the pair of

sheets

21 and 22 are directly joined to each other. Specifically, the

sheet joining portions

60 and 61 shown in embodiment 3 (fig. 8 and 9) described later can be illustrated.

The rigidity of the sheet joining portion is increased as compared with a portion where the pair of

sheets

21, 22 are not joined to each other. Therefore, by not including the sheet joining portion in the waist portion 20 as in embodiment 1, the flexibility of the waist portion 20 can be further improved.

(embodiment 2)

Fig. 7 is a schematic plan view of the abdomen-side waist portion 20 according to embodiment 2. In embodiment 2, the 1 st continuous stretchable member 231A has the "central fixing portion 57" fixed to the pair of

sheets

21, 22 at least over the entire region of the region R1 overlapping with the absorbent core 11A in the width direction, similarly to the 2 nd continuous stretchable member 231 b.

However, the 1 st continuous extensible member 231a also has the non-fixed portion 51. Therefore, the center fixing portion 57 of the 1 st continuous extensible member 231a is discontinuous from the end fixing portion 50 on one side to the end fixing portion 50 on the other side in the width direction. In fig. 7, non-fixed portions 51 are disposed on both sides of a central fixed portion 57. However, the present invention is not limited to this, and the non-fixed portion 51 (not shown) may be disposed only on one side of the center fixed portion 57.

By thus also providing the central fixing portion 57 to the 1 st continuously stretchable member 231A, the skin-side sheet 21 is also fixed to the position where the 1 st continuously stretchable member 231A is in close contact with the wearer in the region R1 where the absorbent core 11A is present in the width direction, and the absorbent core 11A is less likely to be displaced in the vertical direction.

In addition, as shown in fig. 7, in the case where the continuously extensible member 231 other than the 1 st continuously extensible member 231a among the plurality of continuously extensible members 231 is the 2 nd continuously extensible member 231b, it is preferable that all of the 1 st continuously extensible members 231a have the central fixed portion 57 and all of the 2 nd continuously extensible members 231b have the non-fixed portion 53. That is, all the continuous telescopic members 231 preferably have the central fixed

portions

52, 57 and the

non-fixed portions

51, 53. In this case, the continuous stretchable member 231 located outside the absorbent main body 10 in the longitudinal direction corresponds to the 1 st continuous stretchable member 231a, and the continuous stretchable member 231 overlapping the absorbent main body 10 in the longitudinal direction corresponds to the 2 nd continuous stretchable member 231 b.

By doing so, the flexibility of the waist unit 20 can be improved by the

non-fixing portions

51, 53 of all the continuously stretchable members 231 while the vertical displacement of the absorbent core 11A is suppressed by the

central fixing portions

52, 57 of all the continuously stretchable members 231.

Further, the movement of the continuously extendable members 231 in the vertical direction is restricted by the

center fixing portions

57, 52 of all the continuously extendable members 231. Therefore, the distance in the vertical direction of the continuously stretchable member 231 can be maintained, and stretchability can be provided in a wide range of the waist portion 20.

As shown in fig. 7, the length W3 in the width direction of the

center fixing portions

52 and 57 of all the 1 st continuous telescopic member 231a and all the 2 nd telescopic member 231b is preferably equal. By doing so, control of formation of the central fixing portions 52, 57 (e.g., an adhesive application step) is facilitated in the manufacture of the diaper 1. When the width-directional lengths W3 of the

center fixing portions

52 and 57 are compared, it is preferable to extend the waist portion 20 so as not to wrinkle.

As in embodiment 1 (fig. 4), the waist portion 20 of embodiment 2 (fig. 7) may have the discontinuous extensible member 232 in which the center portion in the width direction is discontinuous. In embodiment 1, the end fixing portions (see

reference numerals

55a and 55b in fig. 4) disposed at both ends of the absorbent core 11A in the width direction so as to be separated from each other may be continuous in the width direction. In this case, the length of the end fixing portions 55(55a, 55b) of the non-continuous extensible member 232 in the width direction may be equal to the length of the

center fixing portions

52, 57 of the continuous extensible member 231 in the width direction. By doing so, control of formation of the

center fixing portions

52, 57 and the end fixing portions 55 (e.g., an adhesive application step) is facilitated in the manufacture of the diaper 1. As shown in fig. 7, when the end fixing portion 55 extends long in the width direction over a wide range of the discontinuous portion (non-stretchable portion) of the discontinuous stretchable member 232, the non-skin side sheet 22 can be prevented from floating at the discontinuous portion. This can improve the appearance of the diaper 1.

But is not limited to the above. For example, the plurality of continuous extensible members 231 may have at least one 1 st continuous extensible member 231a having the center fixing portion 57. Further, the lengths of the

central fixing portions

52 and 57 in the width direction of the plurality of continuous extensible members 231 may not be equal to each other. The waist portion 20 of embodiment 2 also does not have a sheet joining portion, as in embodiment 1.

(embodiment 3)

Fig. 8 to 10 are schematic plan views of the abdomen-side waist portion 20 according to embodiment 3. In embodiment 3, the waistline unit 20 includes sheet joining portions 60 to 62 (2 nd sheet joining portion of the present invention) for joining the pair of

sheets

21 and 22 to each other at a position inward in the width direction of the end fixing portion 50. Further, as a method of joining the pair of

sheets

21 and 22 at the sheet joining portions 60 to 62, welding, bonding with an adhesive, or the like can be exemplified.

The sheet joining portions 60 to 62 will be described below by taking the waist portion 20 having the continuous stretchable member 231 and the discontinuous stretchable member 232 shown in fig. 4 as an example. However, any of the waist portions 20 described in embodiments 1 and 2 may have the sheet joint portions 60 to 62 described below.

The pair of

sheets

21 and 22 are separated from each other in the

non-fixing portions

51 and 56 of the waist stretchable member 23. Therefore, the non-skin side sheet 22 is easily visible as floating on the appearance of the diaper 1, and irregular large longitudinal gathers are easily formed when the waist stretching member 23 contracts. Thus, by providing the sheet bonding portions 60 to 62 in the waistline portion 20, the floating of the non-skin side sheet 22 can be suppressed, and the appearance of the diaper 1 can be improved.

The sheet joint 60 shown in fig. 8 extends longer in the width direction of the diaper 1 than in the up-down direction (longitudinal direction). The portions where the waist stretchable member 23 is fixed to the pair of sheets 21 and 22 (for example, the central fixing portion 52 of the 2 nd continuous stretchable member 231b) and the sheet joining portion 60 are not continuous but are disposed at intervals in the vertical direction at positions inward in the width direction of the end fixing portions 50. That is, the sheet joining portion 60 is disposed so as not to intersect with the waist stretching member 23. Specifically, the sheet joining portions 60 shown in fig. 8 extend continuously from one end edge to the other end edge of the waist portion 20, and are disposed between all the waist stretchable members 23 arranged in the up-down direction.

By providing the sheet joining portion 60 extending long in the width direction in the waistline portion 20 in this way, regular fine longitudinal gathers are easily formed when the waistline stretching member 23 contracts. Therefore, the appearance of the diaper 1 is improved, and the user can be given an impression that the fit of the waist portion 20 is good.

In addition, the movement of the waist stretching member 23 in the vertical direction is restricted by the sheet joining portion 60. Therefore, the distance in the vertical direction of the waist stretching member 23 can be easily maintained, and stretchability can be provided in a wide range of the waist portion 20.

However, when the waist portion 20 includes the sheet joining portion 60, the flexibility of the waist portion 20 is reduced as compared with the case where the waist portion 20 does not include the sheet joining portion 60. However, the sheet joining portion 60 is less likely to come into close contact with the skin of the wearer than the waist stretchable member 23. Therefore, the user is less likely to feel the hardness of the adhesive or the like of the sheet joining portion 60 than the hardness of the adhesive or the like that fixes the waist stretchable member 23 to the pair of

sheets

21, 22, and the wearing comfort of the waist portion 20 can be suppressed from being lowered.

In addition, in the region R1 where the absorbent core 11A exists in the width direction, the waist unit 20 is less likely to contract in the width direction due to the high rigidity of the absorbent core 11A in the width direction. In addition, the 2 nd continuous stretchable member 231b having the center fixing portion 52 is disposed in the waist portion 20 (in particular, in fig. 7, all the continuous stretchable members 231 have the center fixing portions 52 and 57). Therefore, even if the sheet joint portion 61 is not disposed in the region R1, irregular large longitudinal wrinkles are less noticeable and less likely to form. Therefore, as shown in fig. 9, the sheet joining section 61 may be disposed on the outer side in the width direction of the absorbent core 11A. By thus shortening the length of the sheet joining portion 61 in the width direction as much as possible, the flexibility of the waist portion 20 can be improved.

However, the present invention is not limited to the

sheet joining portions

60 and 61 shown in fig. 8 and 9. For example, the

sheet joining portions

60 and 61 may be arranged intermittently in the width direction without extending continuously in the width direction. In the case of the waist portion 20 having the discontinuous extensible member 232, the

sheet joining portions

60 and 61 may not be provided in the discontinuous portion of the discontinuous extensible member 232. The

sheet joining portions

60 and 61 may be disposed only in a part between the plurality of waist stretching members 23 arranged in the up-down direction. The

sheet joining portions

60 and 61 may be disposed on the inner side in the width direction than the locking portion 40 or on the inner side in the width direction than the end fixing portion 50.

As shown in fig. 7 of embodiment 2, in the case where the discontinuous portion end fixing portion 55 of the discontinuous extensible member 232 extends long in the width direction, the end fixing portion 55 can suppress the floating of the non-skin side sheet 22 at the discontinuous portion. On the other hand, as shown in fig. 8, in the case where the end fixing portions 55 are separated in the width direction in the discontinuous portion of the discontinuous extensible member 232, the non-skin side sheet 22 is easily floated in the region between the end fixing portions 55. Therefore, as shown in fig. 8, the sheet joining portion 60 is preferably disposed in the discontinuous portion of the discontinuous extensible member 232. By doing so, the non-skin side sheet 22 can be suppressed from floating, and the appearance of the diaper 1 can be improved. However, the present invention is not limited to the above-described configuration, and the sheet joining portion 60 may not be provided in the discontinuous portion of the discontinuous extensible member 232 as shown in fig. 9.

As shown in fig. 10, the sheet joining portion 62 may be disposed to intersect the waist stretching member 23 in the vertical direction. Specifically, in fig. 10, the pair of sheet joining portions 62 are arranged at the same positions in the width direction as both end portions in the width direction of the absorbent core 11A and above the 2 nd continuous stretchable member 231 b. The sheet joining portion 62 has a rectangular shape extending long in the vertical direction.

The movement of the continuously stretchable member 231 in the vertical direction is regulated by the sheet joining portion 62. Therefore, the distance in the vertical direction of the continuously stretchable member 231 can be easily maintained, and stretchability can be imparted to the waist portion 20 over a wide range.

In addition, the end fixing portions 50 and the locking portions 40 make the two ends of the waistline portion 20 in the width direction have relatively high rigidity in the longitudinal direction, and are less likely to be crushed in the longitudinal direction. In the case of fig. 10, the rigidity in the longitudinal direction of the widthwise central portion of the waistline portion 20 is also increased by the sheet bonding portion 62, and thus the flattening in the longitudinal direction is also made difficult. Therefore, the shape of the waist portion 20 (here, the rectangular shape) is easily maintained, and the waist portion 20 can reliably cover the waist of the wearer.

Other embodiments are also possible

The embodiments of the present invention have been described above, but the above embodiments are intended to facilitate understanding of the present invention, and are not intended to be restrictive. It is to be understood that the present invention can be modified and improved without departing from the gist thereof, and equivalents thereof are also included in the present invention.

In the above embodiment, the waistline unit 20(30) is formed by the pair of flexible sheets 21 and 22(31 and 32) such as nonwoven fabric, but a plurality of openings 25 may be provided on the surfaces of the pair of

sheets

21 and 22. Fig. 11 is a schematic perspective view showing an example of the

sheets

21 and 22 having a plurality of holes 25. In the example of fig. 11, the skin-side sheet 21 is an apertured nonwoven fabric having a plurality of apertures 25 that penetrate through the front and back sides of the sheet at intervals. The plurality of holes 25 may be provided in the non-skin side sheet 22, or may be provided in both the skin side sheet 21 and the non-skin side sheet 22.

By providing a plurality of openings 25 in at least one of the pair of

sheets

21 and 22, the sheet is improved in air permeability, and the waist portion 20 can be made less stuffy when the diaper 1 is worn. On the other hand, such an opening 25 is usually formed using a heated pin member (not shown) or the like, but in this case, the outer peripheral edge portion of the opening 25 melts and solidifies, and thus the opening 25 may be hardened. In this case, the flexibility of the waistline portion 20 is impaired, and the skin feel of the waistline portion 20 is deteriorated. In addition, when the openings 25 are provided and the adhesive for fixing is applied to the entire area of the waist stretching member 23, the weight per unit area of the adhesive may be relatively increased when the waist stretching member 23 contracts, and the feeling of tackiness of the adhesive may be felt from all the waist stretching members 23 through the openings 25.

In response to this, the waistline unit 20 includes a non-fixed portion 51 in which the waistline stretch member 23 is not fixed to the waistline unit 20 in a region on the inner side in the width direction than the pair of

end fixing portions

50, 50. In addition, there is a portion where the region where the non-fixing portion 51 is provided overlaps with the region where the plurality of openings 25 are provided. Since the waist portion 20 has high flexibility in the region where the non-fixing portion 51 is provided, the influence of the curing of the outer peripheral edge portion of the opening 25 can be relatively reduced in this region. That is, the entire waist portion 20 is less likely to be stiff. In addition, since the waist stretchable member 23 is not coated with the adhesive in the non-fixed portion 51, the feeling of stickiness of the adhesive can be suppressed from being felt by the wearer through the opening 25. Therefore, the flexibility and air permeability of the waist portion 20 can be improved without giving a wearer a sense of discomfort.

Description of the reference numerals

1. Pants-type disposable diapers (absorbent articles); 10. an absorbent main body; 11. an absorbent body; 11A, an absorbent core; 11B, a core wrap; 12. a topsheet; 13. a negative film; 14. an outer sheet; 20. an abdominal-side waistline portion (waistline portion); 30. a back-side waistline unit (waistline unit); 21. 31, skin side sheet (sheet); 22. 32, non-skin side sheet (sheet); 23. 33, a waist stretchable member; 231. a continuous telescopic member (telescopic member); 232. a discontinuous telescoping member; 231a, a 1 st continuous telescopic member (1 st telescopic member); 231b, a 2 nd continuous telescopic member (a 2 nd telescopic member); 231c, 3 rd continuous telescopic member; 25. opening a hole; 40. a card-holding section; 50. 55, an end fixing part; 51. 53, 56, non-fixed part; 52. 54, 57, a central fixing part; 60. sheet joining portions (1 st sheet joining portion, 2 nd sheet joining portion); 61. sheet joining portions (1 st sheet joining portion, 2 nd sheet joining portion); 62. a sheet joining portion (2 nd sheet joining portion).

Claims

1. An absorbent article having a width direction and a length direction in an unfolded state,

and has a pair of waist portions and an absorbent body having an absorbent core,

at least one of the pair of waist portions has a pair of sheets and a plurality of stretchable members arranged between the pair of sheets and stretchable in the width direction,

each of the stretchable members is continuously arranged from one end portion to the other end portion in the width direction of the one waist portion, and has a pair of end portion fixing portions in which both end portions in the width direction are fixed to the pair of sheets,

the plurality of telescoping members having a 1 st telescoping member and a 2 nd telescoping member,

the 1 st extensible member has a non-fixed portion that is not fixed to the pair of sheets at a position on the inner side in the width direction than the end portion fixed portion,

the 2 nd stretchable member has a central fixing portion fixed to the pair of sheets at least over an entire region of a region overlapping the absorbent core in the width direction, and is disposed in a region overlapping the absorbent body in the longitudinal direction.

2. The absorbent article according to claim 1,

the plurality of telescoping members has a plurality of the 2 nd telescoping member.

3. The absorbent article according to claim 1 or 2,

the plurality of telescoping members has a plurality of the 1 st telescoping member.

4. The absorbent article according to any one of claims 1 to 3,

at least one of the 2 nd stretch members is disposed in a region overlapping the absorbent core in the longitudinal direction.

5. The absorbent article according to any one of claims 1 to 4,

at least one of the 2 nd telescopic members has a non-fixing portion which is not fixed to the pair of sheets between the end fixing portion and the center fixing portion in the width direction.

6. The absorbent article according to any one of claims 1 to 5,

the center fixing portion of at least one of the 2 nd telescopic members is continuously arranged from the end fixing portion on one side in the width direction to the end fixing portion on the other side.

7. The absorbent article according to any one of claims 1 to 6,

the non-fixed portion of at least one of the 1 st elastic members is disposed over at least the entire region of the region overlapping the absorbent core in the width direction.

8. The absorbent article according to claim 5,

the telescopic members of the plurality of telescopic members other than the 1 st telescopic member are the 2 nd telescopic member,

all of the 1 st elastic members have a central fixing portion fixed to the pair of sheets at least over an entire region of a region overlapping the absorbent core in the width direction,

all of the 2 nd telescopic members have the non-fixed portion.

9. The absorbent article of claim 8,

the length in the width direction of the center fixing portion of each of all the 1 st and 2 nd telescopic members is equal.

10. The absorbent article according to any one of claims 1 to 9,

the length in the width direction of a region between the end fixing portion on one side and the end fixing portion on the other side in the width direction is longer than the length in the width direction of the absorbent main body.

11. The absorbent article according to any one of claims 1 to 10,

the one waist portion does not include a 1 st sheet joining portion that joins the pair of sheets to each other at a position inward in the width direction of the end fixing portion, and the 1 st sheet joining portion is disposed so as not to intersect with a portion where the stretchable member is fixed to the pair of sheets at a position inward in the width direction of the end fixing portion.

12. The absorbent article according to any one of claims 1 to 10,

the one waist portion has a 2 nd sheet joining portion that joins the pair of sheets to each other at a position further inward in the width direction than the end fixing portion.

13. The absorbent article of claim 12,

the 2 nd sheet joining portion extends longer in the width direction than in the longitudinal direction, and is disposed at a distance in the longitudinal direction from a portion where the stretchable member is fixed to the pair of sheets at a position inward in the width direction of the end fixing portion.

14. The absorbent article according to claim 12 or 13,

the 2 nd sheet joining section is disposed on the outer side in the width direction of the absorbent core.

15. The absorbent article according to any one of claims 1 to 14,

a plurality of through holes are arranged on at least one of the pair of sheets at intervals,

the waist portion has a portion where a region provided with the non-fixing portion overlaps a region provided with the opening.