JP2003111794A - Body fluid absorptive wearing article of throw-away pants type - Google Patents

Abstract

PROBLEM TO BE SOLVED: To provide a body fluid absorptive article having a body fluid absorptive core which is small in the level differences produced between the end edges of this core and a wearing person's body and is good in appearance when the article is worn. SOLUTION: The core 4 in at least a front side area 7B of front and rear side areas 7B and 7C of the body fluid absorptive article is gradually decreased in the thickness of the front end area over a range of at least 10 mm toward the front end edge thereof. This front end area is pressed by a portion of an elastic member 15b.

Description

Detailed Description of the Invention

[0001]

BACKGROUND OF THE INVENTION 1. Field of the Invention The present invention relates to disposable pants-type body fluid absorbent wearable articles such as disposable pants-type diapers, training pants and incontinence pants.

[0002]

2. Description of the Related Art Conventionally, a pants-type bodily fluid absorbent wearing article of this type has elastic members disposed at the waist opening edge and a pair of left and right leg opening edges, respectively. It is stretchable. Further, elastic members are widely arranged in the vertical direction from the waist edge portion to the crotch region, and a pressing force is applied from the outside to a required portion of the worn article where the liquid-absorbent core is located, and the inside of the portion is worn by the wearer. There is also known one that is brought into close contact with the body, and such an article is disclosed in, for example, JP-A-4-16615.
0, 4-289201.

[0003]

SUMMARY OF THE INVENTION In order to prevent leakage of bodily fluid by closely adhering a required part where a core is located to the body based on the above-mentioned known article, an elastic member around the waist widens the circumference of the wearer's waist. It may put pressure on the product and impair the feeling of wearing it. However, in order to prevent leakage of body fluid, the core may not be brought into close contact with the entire area, but only the peripheral edge of the core may be brought into close contact, and doing so reduces the risk of impairing the wearing feeling.

An object of the present invention is to improve the adhesiveness at least in the vicinity of the edge of the core.

[0005]

The present invention for solving the above-mentioned problems is directed to a liquid-absorbent core having front and rear end edges and both side edges, and both sides and both side edges of the core which are coated on both sides of the core. A laminated body is composed of a liquid-permeable topsheet and a liquid-impermeable backsheet extending from the crotch region, the laminate extending between the front side region, the rear side region, and the front and rear side regions. And, by joining both side edges of the front and rear side regions in a state where the laminated body is folded in the longitudinal direction, a trunk opening portion,
A pair of leg openings are defined, and a large number of elastic members are arranged in the front and rear side regions including the trunk opening and in the leg openings, extending in the circumferential direction thereof and spaced in the longitudinal direction thereof. Of the disposable disposable pants-type bodily fluid absorbent wearing article described above.

A feature of the present invention is that the core in at least the front side area of the front and rear side areas is at least 1 toward the front end edge in the vicinity thereof including the front end edge.
The front end region over the range of 0 mm is formed to have a reduced thickness, and the front end region over the range is pressed by a part of the elastic member.

In a preferred embodiment of the present invention, the shape of the core is formed by reducing or compressing the material in the front end region of the core toward the front end edge. is there.

In a preferred embodiment of the present invention, the core in the rear side region has a shape in which the thickness of the rear end region decreases toward the rear end edge in the vicinity thereof including the rear end edge by at least 10 mm. Are formed on the
A rear end region extending over the range is pressed by a part of the elastic member.

In a preferred embodiment of the present invention, at least the front side region of the front and rear side regions is defined as a first waist region with a maximum of 20 mm in each of the upper and lower sides with the front end edge of the core as a boundary. A second waist region defined between the first waist region and the leg openings, and a third waist region defined between the first waist region and the waist opening And an arrangement interval dimension of each elastic member in the first waist region is set to be smaller than an arrangement interval dimension of each elastic member in the second waist region. The cross-sectional area and extension stress of each elastic member are larger than those of each elastic member in the first and second waist regions.

[0010]

BEST MODE FOR CARRYING OUT THE INVENTION As a disposable pants-type bodily fluid absorbent wearing article according to the present invention, a disposable pants-type diaper will be described by way of example with reference to the accompanying drawings.

In FIG. 1, the diaper is composed of a laminate 1. The laminated body 1 is composed of a liquid-permeable top sheet 2, a liquid-impermeable back sheet 3, and a liquid-absorbent core 4 arranged between these sheets. The core 4 is formed in an hourglass or I shape, and has front and rear end edges 4A and 4B and both side edges 4C. The front and back sheets 2 and 3 are formed in such a size that their peripheral edges extend from the peripheral edge of the core 4, and their extended portions are joined to each other so that both side flaps 6 are formed.
A and 6B and both end flaps 6C and 6D are formed. Such a laminated body 1 is located substantially in the center of the laminated body 1 and has front and rear side regions 7B and 7B through a crotch region 7A which is formed narrowly.
It can be divided into C. The laminated body 1 is folded and folded in the crotch region 7A so that the topsheet 2 is located on the inner surface of the diaper, and is joined by the joining means 10 at both side edges of the front and rear side regions 7B and 7C, and by this joining, the body opening 11 is formed. ,
A pair of leg openings 12 are defined. Torso opening 11
Elastic members 15 and 16 that expand and contract in the circumferential direction are attached to the front side region 7B including and the leg opening 12.

In FIG. 2, the core 4 in the front region 7B
Includes the front edge 4A in its vicinity including the front edge 4A.
It is formed in a shape in which the thickness of the front end region gradually decreases toward at least 10 mm. Such a shape is obtained by reducing or compressing the material in the relevant portion of the core 4 toward the front end edge 4A. Front edge 4A
The front and back sheets 2 and 3 extending from the above are joined to each other to form a body opening edge 17. Although not shown, it should be understood that the rear region 7C is similarly configured.

The front region 7B is bordered by the front end edge 4A of the core 4.
Up and down each maximum 20mm, preferably 15-10mm
Waist area 7B defined by the range₁And the torso area 7B₁When
Waist area 7B defined between both leg openings 12_TwoWhen,
Waist area 7B₁Waist circumference defined between the body and the opening edge 17
Area 7B_ThreeAnd have. Waist area 7B₁, 7B_Two，
7B_ThreeA large number of elastic members 15 in the direction around them.
Surfaces that extend and are spaced longitudinally of them
Stretched on the inner surface of sheet 2 or the inner surface of front and back sheets 2 and 3
It is fixed in the state. Waist area 7B_ThreeElastic member in
Each of 15a is a waist region 7B₁, 7B_TwoElasticity in
Rather than each of the members 15b, 15c, their cross-sectional area and
Largely set with respect to elongation stress. Waist area 7B
₁, 7B _TwoEach of the elastic members 15b and 15c in
Substantially equal to each other in terms of their cross-sectional area and extensional stress
Although it is made to be good, the waist area 7B₁Elastic member 1
The arrangement interval dimension of each of 5b is the waist region 7B._TwoIn
Set smaller than the array spacing of each elastic member 15c
Therefore, regarding the surface pressure per constant area, the body circumference
Area 7B₁Is the waist area 7B_TwoIs bigger than
Waist area 7B₁, 7B_Two, 7B_ThreeElastic member 15 in
b, 15c and 15a are 50% elongation per 150 mm length
Long stress is 5 to 50g and elongation rate is 1.1 to 2.5 times
Installed in range.

With respect to the surface pressure per constant area, the waist region 7
In the above-described embodiment in which B ₁ is larger than the waist region 7B ₂ , the front end edge 4A of the core 4 located in the waist region 7B ₁ and a region in the vicinity thereof are not affected by the rigidity of the core 4 during wearing of the diaper. Therefore, there is an advantage that it does not separate from the wearer's skin, in other words, it adheres to the skin stronger than the waist circumference region 7B ₂ despite the rigidity of the core 4. However, on the other hand, increasing the surface pressure only in a part of the area may give the wearer a feeling of strangeness. Therefore, regarding the surface pressure per constant area, the waist regions 7B ₁ and 7B ₂ may be made substantially equal, but the waist region 7B ₁ may be better than the waist region 7B _{2 in} terms of adhesion to the skin. preferable. In order to carry out this, as in the above-described embodiment, the arrangement interval dimension of each elastic member 15b of the waist region 7B ₁ is made smaller than that of the elastic member 15c of the waist region 7B ₂ , and the waist region is The extension stress of each elastic member 15b of 7B ₁ may be appropriately made smaller than that of each elastic member 15c of the waist region 7B ₂ . In order to reduce the size in this way, the elastic members 15b, 15 of the waist regions 7B ₁ , 7B ₂
The material and the cross-sectional area of each of c are made substantially equal to each other, and the expansion ratio of each of the elastic members 15b of the waist region 7B ₁ is made smaller than that of each of the elastic members 15c of the waist region 7B ₂ . Elastic member 15 in the waist regions 7B ₁ and 7B ₂
The materials and the expansion ratios of b and 15c may be made substantially equal, and the cross-sectional area of each of the elastic members 15b in the waist region 7B ₁ may be made appropriately smaller than that of the elastic member 15c in the waist region 7B ₂ .

The cross-sectional shape of the elastic member 15 may be circular or rectangular, but it is preferable that the cross-sectional shape has a width (diameter) dimension larger than a thickness (diameter) dimension.

In the above description, the front side region 7B is concerned, but it goes without saying that the rear side region 7C may have the same structure as the front side region 7B or a slightly different structure.

In the diaper thus constructed, the elastic members 15 are arranged closely above and below the front end edge 4A of the core with a narrow interval, and the core 4 is surely skin-skinned at the portion where the front end edge 4A and its vicinity are located. Since it adheres to the
There is no leakage from the front edge 4A. Waist area 7B ₃
The elastic member 15a extends in the entire width direction of the front and rear side regions 7B and 7C so as to be substantially continuous in the waist circumference direction.

In place of the elastic member 15b in the waist region 7B ₁ ,
It is possible to improve the adhesion between the front end edge 4A of the core and its vicinity by using one or a plurality of relatively wide band-shaped elastic members, but in order not to impair the air permeability inside and outside the diaper. It is preferable to use a material having moisture permeability.

In the present invention, a non-woven fabric or a perforated plastic film is used for the top sheet 2, and the back sheet 3
For this, a plastic film such as polyethylene can be used. As the core 4, crushed pulp or a mixture of crushed pulp and superabsorbent polymer powder formed into a required shape by a known or well-known technique can be used. A material having rubber elasticity, such as rubber or plastic elastomer, can be used for the elastic members 15 and 16.

[0020]

In the wearing article according to the present invention, since the thickness in the vicinity of the edge of the core is gradually reduced toward the edge, a step generated between the core and the body is increased as compared with the case where it is not so. Is small and looks good when worn.

[Brief description of drawings]

FIG. 1 is a partially cutaway perspective view of a pants-type diaper.

FIG. 2 is an end view taken along line II-II of FIG.

[Explanation of symbols]

1 Laminated Body 2 Top Sheet 3 Back Sheet 4 Core 4A Front Edge 7A Inseam Area 7B Front Side Area 7C Rear Side Area 7B ₁ First Waist Area 7B ₂ Second Waist Area 7B ₃ Third Waist Area 15 Elastic Member 16 Elastic Element

Claims (4)

[Claims] 1. A liquid-absorbent core having front and rear edges and both side edges, and a liquid-permeable top sheet and a liquid-impermeable back surface which cover both surfaces of the core and extend from the both end edges and both side edges of the core. A laminate is composed of a sheet, and the laminate has a front side region, a rear side region, and a crotch region extending between the front and rear side regions, and the laminate is folded in its longitudinal direction. By joining the both side edges of the front and rear side regions in a state where the body opening is formed,
A pair of leg openings are defined, and a large number of elastic members are arranged in the front and rear side regions including the trunk opening and in the leg openings, extending in the circumferential direction thereof and spaced in the longitudinal direction thereof. In a disposable pants-type body fluid absorbent wearing article,
The core in at least the front side region of the front and rear side regions is formed in a shape in which the thickness of the front end region decreases toward the front end edge in the vicinity thereof including the front end edge at least by 10 mm, and The article is characterized in that a front end region extending over is pressed by a part of the elastic member. 2. The article of claim 1, wherein the shape of the core is formed by either reducing or compressing material in the front end region of the core toward the front edge. 3. The core in the rear side region is formed in a shape in which the thickness of the rear end region is reduced toward the rear end edge in the vicinity thereof including the rear end edge over a range of at least 10 mm, The article according to claim 1 or 2, wherein a rear end region extending over the range is pressed by a part of the elastic member. 4. A first waist region, wherein at least the front region of the front and rear side regions is defined by a maximum of 20 mm above and below the front end edge of the core, and the first waist region. And a second waist region defined between the both leg openings, and a third waist region defined between the first waist region and the waist opening, The arrangement interval dimension of each elastic member in the first waist region is made smaller than the arrangement interval dimension of each elastic member in the second waist region.
The article according to any one of claims 1 to 3, wherein a cross-sectional area and extension stress of each of the elastic members in the waist region are larger than that of each of the elastic members in the first and second waist regions. .