阅读说明：本技术 短裤型吸收性物品 (Pants-type absorbent article ) 是由 槙秀晃 井上拓也 大窪哲郎 清水纪子 于 2018-12-07 设计创作，主要内容包括：短裤型吸收性物品(1)包括具有彼此垂直的上下方向、左右方向和前后方向的吸收性主体(10)以及结合到吸收性主体(10)并设置有在左右方向上伸缩的弹性片(24)的第一腰身部(20),其中,在上下方向上,弹性片(24)的下端(24b)处于距吸收性主体(10)的上端(10a)上方预定距离(lg)的位置。(A pants-type absorbent article (1) comprises an absorbent main body (10) having a vertical direction, a horizontal direction, and a front-rear direction perpendicular to each other, and a first waist section (20) joined to the absorbent main body (10) and provided with an elastic sheet (24) that stretches and contracts in the horizontal direction, wherein a lower end (24b) of the elastic sheet (24) is positioned a predetermined distance (lg) above an upper end (10a) of the absorbent main body (10) in the vertical direction.)

1. A pants-type absorbent article having a vertical direction, a horizontal direction and a front-back direction intersecting each other,

the pants-type absorbent article includes:

an absorbent main body; and

a first waist portion joined to the absorbent main body and including a stretchable sheet having stretchability in the left-right direction,

the stretchable sheet has a lower end at a position spaced apart upward from an upper end of the absorbent main body by a predetermined distance in the up-down direction.

2. A pant-type absorbent article according to claim 1,

the first waistline portion includes a plurality of elastic members having stretchability in the left-right direction, and

a left-right direction average stress in a vertical direction region of the first waist portion between a lower end of the stretchable sheet and an elastic member located at a highest position among the plurality of elastic members

Is less than

And a left-right direction average stress in a vertical direction region of the first waist portion where the stretchable sheet is disposed.

3. A pant-type absorbent article according to claim 2,

the elastic member is disposed in at least a part of a vertical direction region of the first waist portion that overlaps with the absorbent main body.

4. A pant-type absorbent article according to claim 3,

the elastic member is not disposed in a vertical direction region of the stretchable sheet of the first waist section, the vertical direction region being not overlapped with the absorbent main body.

5. A pant-type absorbent article according to any one of claims 2 to 4,

the first waistline portion includes a plurality of the elastic members, and

a left-right direction average stress in a vertical direction region of the first waist section where the stretchable sheet is disposed

Is less than

A left-right direction average stress in a vertical direction region of the first waist portion where the plurality of elastic members are arranged.

6. A pant-type absorbent article according to any one of claims 2 to 5,

the first waistline portion includes a plurality of the elastic members, and

in the vertical direction region of the first waist portion where the plurality of elastic members are arranged,

the right-left direction average stress in a region above the center in the up-down direction is smaller than the right-left direction average stress in a region below the center in the up-down direction.

7. A pant-type absorbent article according to claim 6,

the absorbent main body includes an absorbent body that absorbs excretory fluid, and

a left-right direction average stress in a vertical direction region of the first waist portion between the elastic member located uppermost and the upper end of the absorber

Is less than

A left-right direction average stress in a vertical direction region of the first waist portion between an upper end of the absorber and a vertical direction center of a vertical direction region in which the plurality of elastic members are arranged.

8. A pant-type absorbent article according to any one of claims 2 to 7,

the first waistline portion includes a plurality of the elastic members, and

a vertical length of a vertical region in which the stretchable sheet is disposed

Is longer than

A length in a vertical direction between a lower end of the stretchable sheet and the elastic member located uppermost.

9. A pant-type absorbent article according to any one of claims 2 to 8,

the absorbent main body includes an absorbent body that absorbs excretory fluid,

the first waistline portion includes a plurality of the elastic members, and

a length in a vertical direction between an upper end of the absorbent main body and an upper end of the absorbent body

Is longer than

The length in the vertical direction between the lower end of the stretchable sheet and the elastic member located uppermost.

10. A pant-type absorbent article according to any one of claims 1 to 9,

the pants-type absorbent article further comprises:

a non-stretchable sheet constituting the first waist portion; and

a fixing portion that fixes the stretchable sheet to the non-stretchable sheet,

the stretchable sheet has a lower end portion in the up-down direction, and the lower end portion of the stretchable sheet includes a folded portion folded upward at a lower end of the fixing portion.

Technical Field

The present invention relates to a pants-type absorbent article.

Background

Pants-type disposable diapers are known as examples of pants-type absorbent articles. Patent document 1 discloses a pants-type disposable diaper in which an absorbent body is disposed between a front body exterior member and a back body exterior member, and both widthwise side edges of the front body exterior member and the back body exterior member are joined to each other to form a waistline opening. In the front body outer cover and the back body outer cover, the waist elastic member is fixed in a state of being stretched between the inner sheet and the outer sheet (non-stretchable sheet).

Disclosure of Invention

Problems to be solved by the invention

In a pants-type disposable diaper provided with elastic members such as in patent document 1, the stretchability of the elastic members disposed around the waistline portion allows the front (back) outer covering body to fit along the waistline portion of the wearer, and also allows the upper end portion of the absorbent main body to fit the lower abdominal region of the wearer.

However, if a plurality of linear elastic members are used as the waistline elastic member, linear marks are likely to be formed on the skin of the wearer due to the pressing of the elastic force of the linear elastic members. In particular, if the wearer is, for example, an infant with sensitive skin, there is a risk of poor texture at the abdominal region or the like, thereby increasing the degree of discomfort.

In addition, in the diaper of patent document 1, the waist elastic member provides fit at both the front (back) outer covering and the upper end portion of the absorbent main body, and therefore there is a risk that these members are easily displaced when the wearer moves his or her body. For example, when the wearer moves their legs back and forth, there are cases where the absorbent main body moves up and down (front and back) on the abdominal side of the wearer as the legs move and the front body exterior body links with the movement of the absorbent main body. In this case, the front body exterior body may be displaced, resulting in poor fit and leakage of excrement from the gap formed in the waist portion.

The present invention has been made in view of the conventional problems such as described above, and an aspect of the present invention is to provide a pants-type absorbent article having a good texture even when the body is moving and being capable of maintaining fit.

Means for solving the problems

A main aspect of the present invention for achieving the above-described aspect is a pants-type absorbent article having an up-down direction, a left-right direction, and a front-back direction that intersect with each other, the pants-type absorbent article comprising: an absorbent main body; and a first waist portion joined to the absorbent main body and including a stretchable sheet having stretchability in the left-right direction, the stretchable sheet having a lower end at a position upwardly separated by a predetermined distance from an upper end of the absorbent main body in the up-down direction.

Other features of the present invention will become apparent by reading the description of the specification with reference to the accompanying drawings.

ADVANTAGEOUS EFFECTS OF INVENTION

According to the present invention, a pants-type absorbent article can be provided which has a good texture and can maintain a good fit even when the body is moving.

Drawings

Fig. 1 is a perspective view of a pants-type disposable diaper 1 (hereinafter referred to as "diaper").

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

Fig. 3 is a sectional view taken along line I-I in fig. 2.

Fig. 4 is an enlarged view of the abdominal-side waistline portion 20 (first waistline portion) and the absorbent main body 10 in fig. 3.

Fig. 5A and 5B are schematic sectional views specifically illustrating the fitting of the diaper 1 on the ventral side of the wearer.

Fig. 6 is a schematic sectional view showing a modification of the method of fixing the stretchable sheet 24 of the abdomen-side waist portion 20.

Detailed Description

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

A pants-type absorbent article having a vertical direction, a horizontal direction, and a front-rear direction that intersect with each other, comprising: an absorbent main body; and a first waist portion joined to the absorbent main body and including a stretchable sheet having stretchability in the left-right direction, the stretchable sheet having a lower end at a position upwardly separated by a predetermined distance from an upper end of the absorbent main body in the up-down direction.

According to the pants-type absorbent article, the region in the first waistline portion where the stretchable sheet is provided is brought into contact with the skin surface of the wearer, and a good texture can be achieved. Further, since the stretchable sheet and the absorbent main body do not overlap each other in the vertical direction, these members can independently follow the movement of the wearer's body without interlocking with each other, and thus good fit can be achieved.

In such a pants-type absorbent article, it is desirable that the first waist portion includes a plurality of elastic members having stretchability in the left-right direction, and that a left-right direction average stress in a vertical direction region of the first waist portion between a lower end of the stretchable sheet and an elastic member located at a highest position among the plurality of elastic members is smaller than a left-right direction average stress in a vertical direction region of the first waist portion in which the stretchable sheet is disposed.

According to this pants-type absorbent article, the first waist portion can be easily and freely deformed in the region between the lower end of the stretchable sheet and the elastic member when the absorbent article is worn. In addition, in the region where the stretchable sheet is disposed, the first waistline portion can be easily fitted to the waistline portion of the wearer.

In such a pants-type absorbent article, it is desirable that the elastic member is disposed in at least a part of a vertical direction region of the first waist portion which overlaps with the absorbent main body.

According to the pants-type absorbent article, since the contraction force of the elastic member acts on the absorbent main body, the absorbent main body is fitted to the body of the wearer, and the positional displacement can be suppressed.

In such a pants-type absorbent article, it is desirable that the elastic member is not disposed in a region in the vertical direction in which the stretchable sheet of the first waist portion and the absorbent main body do not overlap.

According to this pants-type absorbent article, since the stretchability of the elastic members (the linear elastic members) is less likely to act in the region (the cushion region) in the vertical direction between the stretchable sheet and the absorbent main body, the first waist section can be easily flexibly deformed in this region. Therefore, the absorbent main body and the region provided with the stretchable sheet can easily follow the movement of the wearer's body independently, and the fitting property of the pants-type absorbent article can be further improved.

In such a pants-type absorbent article, it is desirable that the first waist portion includes a plurality of the elastic members, and a left-right direction average stress in a vertical direction region of the first waist portion in which the stretchable sheet is arranged is smaller than a left-right direction average stress in a vertical direction region of the first waist portion in which the plurality of the elastic members are arranged.

According to this pants-type absorbent article, the first waistline portion does not press the waistline portion of the wearer excessively when the absorbent article is worn, and the wearer is less likely to feel discomfort. On the other hand, a relatively large pressing force acts on the absorbent main body, and therefore, even if the absorbent main body is pulled or subjected to a large external force, the positional displacement of the absorbent main body is less likely to occur.

In such a pants-type absorbent article, it is desirable that the first waist portion includes a plurality of the elastic members, and that, with respect to a vertical region of the first waist portion in which the plurality of the elastic members are arranged, a horizontal average stress in a region above a center in the vertical direction is smaller than a horizontal average stress in a region below the center in the vertical direction.

According to this pants-type absorbent article, the amount of stress decreases in stages from the lower side toward the upper side (upper end) of the absorbent main body. In other words, the closer to the region (buffer region) between the lower end of the stretchable sheet and the elastic member, the smaller the amount of stress. This makes it possible to more effectively cushion the forces acting in the areas above and below this area.

In such a pants-type absorbent article, it is desirable that the absorbent main body includes an absorber that absorbs excretory fluid, and a left-right direction average stress in a vertical direction region of the first waist portion between the uppermost elastic member and an upper end of the absorber is smaller than a left-right direction average stress in a vertical direction region of the first waist portion between the upper end of the absorber and a vertical direction center of the vertical direction region in which the plurality of elastic members are arranged.

According to the pants-type absorbent article, the amount of stress can be set to be lower as the position is closer to the upper end portion of the absorbent main body. Further, in the region overlapping with the absorber, the absorber can easily fit the body of the wearer. On the other hand, in the region not overlapping with the absorber, excessive pressure does not occur, and a soft texture can be achieved.

In such a pants-type absorbent article, it is desirable that the first waistline portion includes a plurality of the elastic members, and a vertical length of a vertical region in which the stretchable sheet is disposed is longer than a vertical length between a lower end of the stretchable sheet and the elastic member positioned uppermost.

According to the pants-type absorbent article, in the region where the stretchable sheet is disposed, a portion of the first waist portion occupying a greater proportion is brought into contact with the skin surface of the wearer and thus, the first waist portion can be prevented from being displaced.

In such a pants-type absorbent article, it is desirable that the absorbent main body includes an absorber that absorbs excretory fluid, the first waistline portion includes a plurality of the elastic members, and a length in a vertical direction between an upper end of the absorbent main body and an upper end of the absorber is longer than a length in a vertical direction between a lower end of the stretchable sheet and the elastic member positioned uppermost.

According to the pants-type absorbent article, the upper end portion of the absorbent main body is more likely to be fitted to the abdominal region of the wearer, and therefore, the positional displacement of the absorbent main body is more likely to be suppressed.

In such a pants-type absorbent article, it is desirable that the pants-type absorbent article further comprises: a non-stretchable sheet constituting the first waist portion; and a fixing portion that fixes the stretchable sheet to the non-stretchable sheet, the stretchable sheet having a lower end portion in the up-down direction, and the lower end portion of the stretchable sheet including a folded portion folded upward at a lower end of the fixing portion.

According to this pants-type absorbent article, the stretchable sheet overlaps itself in the folded portion, and thus the stretching force is enhanced, which suppresses positional displacement of the abdomen-side waist portion. Further, by changing the position of the lower end of the fixing portion, the position of the lower end of the stretchable sheet can be changed, and the size of a region (cushion region) where the stretchable sheet and the absorbent body do not overlap can be freely adjusted. This makes it easier to realize an absorbent article having optimal fit in accordance with the body shape or the like of the intended wearer.

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

Hereinafter, an embodiment of a pants-type absorbent article according to the present invention will be described by taking a disposable diaper for an infant as an example. Note that the pants-type absorbent article according to the present invention is not limited to disposable diapers for infants, and is also applicable to disposable diapers for adults, sanitary shorts (sanitarian shorts), and the like, for example.

Disposable diaper 1 of the pants type

Fig. 1 is a perspective view of a pants-type disposable diaper 1 (hereinafter referred to as "diaper"). Fig. 2 is a plan view of the diaper 1 in an unfolded and stretched state. Fig. 3 is a sectional view taken along line I-I in fig. 2.

In the pants-type state shown in fig. 1, the diaper 1 has a vertical direction and a horizontal direction, and includes a waist opening BH and a pair of leg openings LH. In the up-down direction, the waist opening BH side is an upper side, and the crotch side is a lower side. As shown in fig. 3, the thickness direction refers to a direction in which the constituent members of the diaper 1 overlap each other, the skin side refers to a side that contacts the wearer in the thickness direction, and the non-skin side refers to a side that does not contact the wearer in the thickness direction.

The diaper 1 further includes an absorbent main body 10, a ventral waistline portion 20, and a dorsal waistline portion 30, which are three members that are rectangular in plan view. The abdomen-side waistline portion 20 (first waistline portion) is in contact with the abdomen-side portion of the wearer, and the back-side waistline portion 30 (second waistline portion) is in contact with the back-side portion of the wearer.

When the diaper 1 is in the developed state shown in fig. 2, the abdominal-side waistline portion 20 and the back-side waistline portion 30 are arranged so that the longitudinal direction thereof coincides with the left-right direction of the diaper 1. The end portion of the absorbent main body 10 on one side in the longitudinal direction thereof is disposed in the center portion in the left-right direction of the abdomen-side waistline portion 20, and the end portion of the absorbent main body 10 on the other side in the longitudinal direction thereof is disposed in the center portion in the left-right direction of the back-side waistline portion 30.

When the diaper 1 is in the unfolded state shown in fig. 2, the absorbent main body 10 is folded once at substantially the center in the longitudinal direction so that the longitudinal direction of the absorbent main body 10 coincides with the up-down direction of the diaper 1. Both side end portions of the abdomen-side waistline portion 20 in the left-right direction of the diaper 1 are joined to both side end portions of the back-side waistline portion 30 by using heat fusion, ultrasonic fusion, or the like to form a pair of joined regions 2, thereby obtaining the diaper 1 in a pants-type state shown in fig. 1.

As shown in fig. 3, the absorbent body 10 includes an absorbent body 11, a liquid-permeable front 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 exterior sheet 14 disposed on the non-skin side of the back sheet 13.

The absorbent body 11 includes an absorbent core 11A that absorbs and holds excreta liquid such as urine and a liquid-permeable core wrap sheet 11B that covers the absorbent core 11A. For example, the absorbent core 11A is constituted of liquid absorbent fibers such as pulp containing superabsorbent polymer (SAP) or the like molded into a predetermined shape.

In addition, as shown in fig. 2, leg elastic members 15 are provided in both side portions in the left-right direction of the absorbent main body 10, thereby allowing the diaper 1 to fit the legs of the wearer. For example, the leg elastic members 15 are fixed between two layers of the exterior sheet 14 that has been folded inward in the left-right direction in a state of being elongated in the longitudinal direction of the absorbent main body 10. The leg elastic member 15 is a linear elastic member, an elastic sheet, or the like.

As shown in fig. 3, the abdominal-side waistline portion 20 and the back-side waistline portion 30 respectively include inner layer sheets 21 and 31, outer layer sheets 22 and 32 overlapped with the inner layer sheets 21 and 31, and a plurality of linear elastic members 23 and 33.

The outer sheets 22 and 32 are disposed on the non-skin side of the inner sheets 21 and 31. The inner sheets 21 and 31 and the outer sheets 22 and 32 are disposed on the non-skin side of the absorbent main body 10. It should be noted that the upper end portions 221 and 321 of the outer sheets 22 and 32 are folded down in such a manner as to cover the end portions in the longitudinal direction of the absorbent main body 10 from the skin side.

The inner sheets 21 and 31 and the outer sheets 22 and 32 are each a non-stretchable sheet having substantially no stretchability in the lateral direction of the diaper 1. The inner sheets 21 and 31 and the outer sheets 22 and 32 may be composed of an SMS nonwoven sheet (spunbond/meltblown/spunbond nonwoven sheet), a spunbond nonwoven sheet, an air-permeable nonwoven sheet, a plastic sheet, a porous plastic sheet, or a laminate sheet of layers including any of them.

The linear elastic members 23 and 33 are arranged side by side in the up-down direction between the inner layer sheets 21 and 31 and the outer layer sheets 22 and 32, and are fixed in a state of being elongated in the left-right direction. Therefore, the abdominal-side waistline portion 20 and the back-side waistline portion 30 can be extended and contracted in the left-right direction so as to fit the waistline portion of the wearer. The linear elastic members 23 and 33 can be constituted by linear elastic members made of rubber, elastic fiber (spandex), or the like.

In the back-side waistline portion 30, the linear elastic member 33 is disposed in a range from the upper end portion to the lower end portion. However, the upper end portion of the abdomen-side waistline portion 20 is not provided with the linear elastic member 23, but is provided with a stretchable sheet 24 having stretchability in the left-right direction.

According to the structure in which the stretchable sheet 24 is provided in place of the linear elastic member 23 at the upper end portion of the abdominal-side waistline portion 20, the upper end portion of the abdominal-side waistline portion 20 is in close contact with the wearer's floor. This therefore suppresses local compression (constraint), thereby enabling suppression of the formation of a mark caused by the elastic member. In particular, the infant has a bulged abdominal region, and therefore it is preferable to suppress the compression in the abdomen-side waist-body portion 20.

In addition, the stretching force in the upper end portions of the waistline portions 20 and 30 largely affects the ability to easily spread (spread open) the waistline opening portion BH when the diaper 1 is to be put on. The stretchable sheet 24 has a property of being easily stretched from a natural state but not easily contracted from an extended state. For this reason, by providing the stretchable sheet 24 at the upper end portion of the abdomen-side waistline portion 20, the waistline opening portion BH can be stretched out relatively easily when putting on the diaper 1, and also compression of the abdomen area after the waistline portions 20, 30 are fitted to the wearer is prevented.

The stretchable sheet 24 may be composed of a material having a mass of 10g/m²To 40g/m²More preferably 15g/m²To 30g/m²The elastic fiber of (2) and a stretchable fiber nonwoven fabric sheet produced by any of various known production methods, such as a spunbonded nonwoven fabric sheet, a breathable nonwoven fabric sheet, a needle-punched nonwoven fabric sheet, and the like. The raw material constituting the elastic fiber is a thermoplastic elastomer, rubber, or the like. Particularly in the case where the raw material is a thermoplastic elastomer, melt spinning (melt spinning) can be performed using an extruder similarly to a conventional thermoplastic resin. The fibers thus obtained can be easily heat-welded, which is advantageous for the stretchable fibrous nonwoven fabric sheet. Examples of the thermoplastic elastomer include styrene elastomers, olefin elastomers, polyester elastomers, and polyurethane elastomers. Any of the above or a combination of two or more may be used alone. The stretchable sheet only needs to exhibit elasticity in at least the right-left direction, and may exhibit elasticity in two or more directions. The stretch coefficient of the stretchable sheet 24 in the left-right direction is preferably about 1.2 to 3.0And (4) the coefficient.

The adhesiveness of the diaper 1 on the abdomen side is ═ diaper

The fit of the diaper 1 on the ventral side of the wearer when the diaper 1 is worn is explained below. Fig. 4 is an enlarged view of the abdominal-side waistline portion 20 (first waistline portion) and the absorbent main body 10 in fig. 3.

As described above, the abdominal-side waistline portion 20 includes the inner layer sheet 21, the outer layer sheet 22, and the stretchable sheet 24. In an intermediate state during the manufacturing process, the outer sheet 22, the inner sheet 21, and the stretchable sheet 24 are sequentially overlapped with each other in the thickness direction from the non-skin side. The stretchable sheet 24 has a lower end 24b extending in the left-right direction.

In the diaper 1 of the present embodiment, the lower end 24b of the stretchable sheet 24 is disposed at a position separated upward by a distance lg from the upper end 10a of the absorbent main body 10. In other words, a gap lg is provided between the lower end 24b of the stretchable sheet 24 and the upper end 10a of the absorbent main body 10 in the vertical direction. A region corresponding to the gap lg in the up-down direction will be referred to as a "buffer region BR". As shown in fig. 4, the buffer region BR is a region where a smaller number of sheet members overlap in the thickness direction and the rigidity is lowest in the abdominal-side waistline portion 20.

The vertical region of the abdomen-side waistline portion 20 in which the stretchable sheet 24 is disposed will be referred to as "upper region UR". When the diaper 1 is worn, the abdominal-side waistline portion 20 can be fitted to the waistline portion of the wearer by the stretchable sheet 24 in the upper region UR contracting in the left-right direction.

In the abdomen-side waistline portion 20, at least a part of the vertical region in which the linear elastic member 23 is disposed overlaps the upper end portion of the absorbent main body 10. The region between the linear elastic member 23a disposed at the uppermost position and the linear elastic member 23x disposed at the lowermost position in the vertical direction is referred to as "lower region DR". When the diaper 1 is worn, the absorbent main body 10 and the abdominal-side waistline portion 20 can be fitted to the wearer's body by contraction of the linear elastic members 23 in the left-right direction in the lower region DR. In particular, the upper end portion of the absorbent main body 10 is pressed against the wearer's skin due to contraction of the linear elastic member 23, thereby suppressing positional deviation when the diaper 1 is worn.

In addition, a region located between the upper region UR and the lower region DR in the up-down direction will be referred to as a "middle region CR". Specifically, the intermediate region CR is a region where neither the stretchable sheet 24 nor the linear elastic member 23 is provided, and such elastic members do not exhibit stretchability in the left-right direction. Note that, in fig. 4, the buffer region BR is included in the middle region CR.

Fig. 5A and 5B are schematic cross-sectional views showing the fitting details of the diaper 1 on the ventral side of the wearer. Fig. 5A shows a cross section taken in the left-right direction with the wearer in a normal posture of a straight spine. Fig. 5B shows a cross section taken in the left-right direction with the wearer in a forward leaning posture (such as sitting lazy, etc.).

In the normal posture of fig. 5A, the upper end portion of the abdomen-side waistline portion 20 is brought into surface-contact with the raised portion of the wearer's abdomen region by the contractive force exerted by the stretchable sheet 24 in the upper region UR. Due to this fitting of the upper end portion of the abdomen-side waist portion 20, the upper end portion functions as a belt, thereby suppressing the abdomen-side waist portion 20 from being displaced from the abdomen area of the wearer. In addition, since the upper side region UR is fitted in surface contact, the contraction pressure is not locally concentrated on the wearer's skin, and such pressure is distributed throughout the stretchable sheet 24. Therefore, the wearer is less likely to feel discomfort, and the trace left in the abdominal region due to contraction of the elastic member can be suppressed.

On the other hand, the upper end of the absorbent main body 10 is fitted to the region below the ridge of the abdominal region of the wearer due to the contractive force exhibited by the linear elastic members 23 in the lower region DR. This region slants obliquely downward from the top of the swell of the abdominal region toward the crotch region, and therefore by causing each linear elastic member 23 to exhibit a contractive force to increase the amount of contraction, it is possible to suppress a situation in which the absorbent main body 10 is displaced downward and a situation in which a gap is formed between the upper end portion of the absorbent main body 10 and the skin of the wearer. Note that, as shown in fig. 4, more members (e.g., the inner sheet 21, the absorber 11, etc.) are overlapped on the skin side of the linear elastic member 23 in the lower region DR, and therefore even if the contractive force is increased in this region, a contraction mark caused by the linear elastic member 23 is not easily formed on the skin of the wearer.

In the cushion region BR (intermediate region CR) between the upper region UR and the lower region DR, the abdomen-side waistline portion 20 is fitted to the abdomen region of the wearer. It should be noted that an elastic member such as the stretchable sheet 24 is not provided in the buffer area BR, thus making it difficult for the stretchability to act in the left-right direction in the buffer area BR. Therefore, the abdomen-side waist portion 20 does not need to be in close contact with the wearer's skin in the cushioning region BR.

When the wearer in the state shown in fig. 5A subsequently turns to the forward-tilted posture, the abdominal region of the wearer becomes a state smaller in the up-down direction. At this time, the stretchable sheet 24 continues to develop a stretching force in the upper region UR, and maintains the attachment of the abdomen-side waist portion 20 in this region. Similarly, the linear elastic member 23 continues to exert an expansion and contraction force in the lower region DR, and thus the fit of the upper end portion of the absorbent main body 10 is maintained in this region. Therefore, in the abdominal region of the wearer, the distance in the up-down direction between the position of the upper region UR and the position of the lower region DR decreases.

On the other hand, since there are few overlapping sheet members in the cushion region BR and the rigidity is low, the abdomen-side waist portion 20 is separated from the skin (abdomen region) of the wearer in the cushion region BR and deformed so as to protrude to the non-skin side as shown in fig. 5B by being compressed vertically by the upper region UR and the lower region DR. Such deformation of the buffer region BR suppresses the collision of the upper region UR and the lower region DR and the decrease in the conformability. In other words, even if the positions of the upper side region UR and the lower side region DR are changed relative to each other due to the movement of the wearer's body, the fit in these regions UR and DR can be maintained.

In contrast to the case in fig. 5B, if the wearer shifts to a posture of dorsal vault (such as when stretching their back, etc.), the wearer's abdominal region will elongate in the up-down direction, and therefore the upper region UR will move upward, while the lower region DR will move downward. Even in this case, the buffer region BR is deformed so as to be elongated upward and downward, so that the conformability in both the upper region UR and the lower region DR can be maintained.

In addition, even in the case where the absorbent body 10 is heavy due to absorption of excrement such as urine and the like and sags down or the absorbent body 10 is pulled down by the movement of the legs of the wearer, the presence of the buffer region BR makes it difficult for the force pulling down the absorbent body 10 to reach the upper region UR. Therefore, the abdominal-side waistline portion 20 is less likely to be displaced, and the wearer can be made less likely to feel unpleasant or uncomfortable.

If the lower end 24b of the stretchable sheet 24 overlaps with the abdomen-side upper end portion of the absorbent main body 10, that is, if the upper region UR and the lower region DR overlap each other in the up-down direction and no buffer region is formed, in the case where the position of the lower region DR is displaced due to, for example, the absorbent main body 10 being pulled, the position of the upper region UR will be displaced accordingly, and the fit will be reduced. In contrast, in the diaper 1 of the present embodiment, the buffer region BR is provided between the lower end 24b of the stretchable sheet 24 and the upper end 10a of the absorbent main body 10 in the up-down direction, thereby allowing the upper side region UR and the lower side region DR to independently follow the movement of the wearer's body. This thus makes it possible to maintain the fit of the abdomen-side waist portion 20 and the absorbent main body 10.

In the present embodiment, a linear elastic member 23 (elastic member) is provided below the upper end 10a of the absorbent main body 10. In other words, the linear elastic member 23 is not provided in the buffer region BR located between the lower end 24b of the stretchable sheet 24 and the upper end 10a of the absorbent main body 10 in the vertical direction. That is, the linear elastic member 23 does not overlap the buffer area BR in the up-down direction, and the stretchability is less likely to act in the buffer area BR due to the linear elastic member 23. Therefore, the abdominal-side waistline portion 20 is more easily flexibly deformed in the cushion region BR, the positional shift of the upper region UR and the lower region DR is less likely to occur, and the fit when the diaper 1 is worn can be further improved. It should be noted that even if the buffer region BR and the linear elastic member 23 are arranged to overlap each other in the up-down direction, the "buffer" function of the buffer region BR can be achieved as long as the stretchable sheet 24 and the upper end 10a of the absorbent main body 10 are separated from each other in the up-down direction.

In the diaper 1 of the present embodiment, the average stress σ in the lateral direction in the cushion region BR of the abdomen-side waistline portion 20_BRA right-left direction average stress σ smaller than that in the upper region UR of the waist part 20_UR(σ_BR＜σ_UR). Therefore, when the diaper 1 is worn, the abdominal-side waistline portion 20 is likely to fit the waistline portion of the wearer in the upper-side region UR, and the abdominal-side waistline portion 20 is likely to be freely deformed in the cushioning region BR. Therefore, the lower region DR and the upper region UR are less likely to interlock due to the deformation of the cushion region BR, and positional displacement of the abdomen-side waist portion 20 and the like are less likely to occur at the waist portion of the wearer.

Note that the foregoing stresses in the buffer region BR and the upper side region UR may be measured by performing a stress test such as the following, for example. First, the joint regions 2 formed at both side portions of the pants-type diaper 1 are cut off, and the abdomen-side waistline portion 20 and the back-side waistline portion 30 are separated from each other. Then, measurement target test pieces are cut out from the cushion region BR and the upper side region UR of the abdominal-side waistline portion 20, respectively. For each test piece, a portion (as a measurement portion) of the test piece having a length of 140mm in the left-right direction was sandwiched between chucks of a tensile tester (Instron corporation). Then, the test piece was stretched at a speed of 100mm/min on both sides in the left-right direction until it was elongated to a length of about 270mm, and then, the test piece was allowed to contract at a speed of 100mm/min until the chuck separation distance returned to 140 mm. This cycle was repeated twice, and when the test piece was elongated to a predetermined length in the second cycle, the tensile load was measured and the stress was calculated.

In addition, the left-right direction average stress σ acting on the abdomen-side waist portion 20 in the upper region UR_URSmaller than the average stress σ in the right-left direction acting on the absorbent body 10 in the lower region DR_DR(σ_UR＜σ_DR). Therefore, when the diaper 1 is worn, the abdominal-side waistline portion 20 does not press the abdominal side of the waistline portion of the wearer excessively, andand the wearer is less likely to experience discomfort. On the other hand, a relatively large amount of force acts in the upper end portion of the absorbent main body 10, and therefore even if the absorbent main body 10 is strongly pulled down due to the movement of the wearer's legs or the like, positional deviation of the absorbent main body 10 is less likely to occur.

In addition, such a configuration is possible: in the abdominal-side waistline portion 20, the linear elastic members 23 are arranged so that the elongation coefficient differs depending on the position in the vertical direction, and therefore the amount of stress acting on the lower region DR also differs depending on the position in the vertical direction. Specifically, it is desirable that the amount of force acting in the absorbent body 10 decreases as the position approaches the buffer region BR. This is because, if the amount of stress is high in the upper end portion of the absorbent body 10 adjacent to the buffer region BR, there is a risk that the action of force in the buffer region BR cannot be completely buffered, and positional deviation of the abdomen-side waist portion 20 will occur together with the movement of the absorbent body 10.

Therefore, it is desirable that the left-right direction average stress σ in the region DR1 above the center in the up-down direction of the lower region DR_DR1The left-right direction average stress σ in the region DR2 below the center in the up-down direction of the lower region DR_DR2Small (sigma)_DR1＜σ_DR2). According to this structure, the amount of stress decreases in stages from the lower side toward the upper side (upper end portion) of the absorbent body 10, and therefore the amount of stress is small in the vicinity of the buffer region BR, and the force acting on the upper region UR and the force acting on the lower region DR can be more effectively buffered.

In addition, in the vertical direction, for the region DR3 which is a portion of the region DR1 not overlapping the absorber 11 and for the region DR4 which is a portion of the region DR1 overlapping the absorber 11, it is desirable that the left-right direction average stress σ in the region DR3 is_DR3Less than the left-right direction average stress σ in the region DR4_DR4(σ_DR3＜σ_DR4). According to this configuration, the amount of stress decreases in stages from the lower side toward the upper end portion of the absorbent main body 10, and the amount of stress is high in the region DR4 overlapping with the absorbent body 11, thereby allowing forThe absorbent body 11 is more easily fitted to the wearer's body. On the other hand, in the region DR3 not overlapping with the absorber 11, the number of sheet member layers is smaller, and the absorbent main body 10 has lower rigidity, so the amount of stress is reduced in the region DR3, and thus excessive compression in the upper end portion of the absorbent main body 10 can be prevented, so that a soft texture is achieved.

In addition, the length of the region in which the stretchable sheet 24 is disposed (upper region UR) is longer than the length of the region between the lower end 24b of the stretchable sheet 24 and the uppermost linear elastic member 23a (intermediate region CR) in the vertical direction. Since the vertical length of the upper region UR is longer than the vertical length of the intermediate region CR, the percentage of the portion of the abdomen-side waist portion 20 that is in contact with the skin surface of the wearer in the upper region UR can be increased, and the positional deviation of the abdomen-side waist portion 20 can be suppressed. In addition, the abdomen-side waistline portion 20 can be made softer in texture in the portion that is fitted to the skin of the wearer.

The vertical length of the region between the upper end 10a of the absorbent body 10 and the upper end 11ea of the absorbent body 11 is longer than the vertical length of the region between the lower end 24b of the stretchable sheet 24 and the uppermost linear elastic member 23a (i.e., the intermediate region CR). Since the length in the vertical direction of the upper end portion of the absorbent main body 10 that does not overlap the absorbent body 11 is longer than the length in the vertical direction of the intermediate region CR, the upper end portion of the absorbent main body 10 more easily fits the abdominal region of the wearer, and the positional displacement of the absorbent main body 10 can be suppressed.

< modification >

Fig. 6 is a schematic sectional view showing a modification of the method of fixing the stretchable sheet 24 of the abdomen-side waist portion 20. An adhesive such as a hot melt adhesive is applied to the fixing portion 41, the fixing portion 41 is provided between the stretchable sheet 24 and the non-stretchable sheets (the inner layer sheet 21 and the outer layer sheet 22), and the stretchable sheet 24 is fixed to the non-stretchable sheets 21 and 22 by the fixing portion 41.

In the abdominal-side waistline portion 20 shown in fig. 3 and 4, the stretchable sheet 24 is arranged to extend straight without being folded in the up-down direction. In other words, the upper region UR is formed between the upper end 24a and the lower end 24b of the stretchable sheet 24. However, in the modification of fig. 6, the lower end 24b of the stretchable sheet 24 extends downward beyond the lower end 41b of the fixing portion 41, and the extending portion is folded upward at the lower end 41b of the fixing portion 41, thereby forming a folded portion 241. In other words, the portion of the stretchable sheet 24 protruding downward from the lower end 41b of the fixed portion 41 is turned upward by the contractive force of the stretchable sheet 24 itself, thereby forming the folded portion 241.

In the region where the folded portion 241 is formed in the lower end portion of the stretchable sheet 24, the stretchable sheet 24 overlaps itself in the thickness direction, and therefore, in this overlapping region, the stretchability of the stretchable sheet 24 is locally increased, and the abdomen-side waist portion 20 is likely to be in close contact with the skin of the wearer. Therefore, when the diaper 1 is worn, the positional deviation of the abdomen-side waist portion 20 is less likely to occur.

In the case of forming the folded portion 241, the cushion region BR is a region between the folded position of the stretchable sheet 24 (i.e., the lower end 41b of the fixed portion 41) and the upper end 10a of the absorbent main body 10 in the vertical direction. Therefore, by adjusting the position (height) of the set fixing portion 41, the vertical length (vertical dimension) of the buffer area BR and the upper area UR can be adjusted. Thus, a diaper with such a buffer region BR can be provided: the size of the buffer area BR is appropriately set according to the age and body shape of the intended wearer.

In other embodiments, the invention is not limited to the specific embodiments described

Although the embodiments of the present disclosure have been described above, the above-described embodiments of the present disclosure are only for facilitating understanding of the present disclosure, and are not to be construed as limiting the present disclosure in any way. The present disclosure may be subject to various changes or modifications without departing from the spirit thereof, and includes equivalents thereof. For example, modifications explained below are possible.

For example, the stretchable sheet 24 is not limited to be provided in the upper end portion of the abdomen-side waistline portion 20. The stretchable sheet 24 may be provided at any position in the vertical direction in the abdomen-side waistline portion 20. In addition, such a configuration is possible: the back-side waistline portion 30 (first waistline portion) may have an elastic sheet and the abdomen-side waistline portion 20 (second waistline portion) may not have an elastic sheet, or both the abdomen-side waistline portion 20 and the back-side waistline portion 30 may have an elastic sheet 24.

In addition, although the diaper in which the abdomen-side waist portion 20 and the back-side waist portion 30 are separate members is explained as an example in the above-described embodiment, such a configuration is possible: a crotch portion is provided between the abdomen-side waistline portion 20 and the back-side waistline portion 30, and the abdomen-side waistline portion 20 and the back-side waistline portion 30 are a continuous single member.

Description of the reference numerals

1 diaper (pants-type absorbent article), 2 joining region,

10 an absorbent main body, 10a upper end,

11 the absorption body, 11ea upper end,

11A absorbent core, 11B core wrap,

12 a front sheet, 13 a back sheet,

14 outer sheet, 15 leg elastic member,

20 abdomen-side waist part (first waist part),

21 inner layer sheet (non-stretchable sheet), 22 outer layer sheet (non-stretchable sheet),

23 linear elastic members, 23a linear elastic members, 23x linear elastic members,

24 stretchable sheet, 24a upper end, 24b lower end,

241 the folded part of the folded part is folded,

30 back waist part (second waist part), 31 inner layer sheet,

32 outer layer sheets, 33 a linear elastic member,

41 the fixing part of the fixing part is provided with a fixing part,

BR buffer area, UR upper area, CR middle area, DR lower area.