JPH1199169A - Disposable liquid absorptive article - Google Patents

Abstract

PROBLEM TO BE SOLVED: To eliminate a an oppressive feeling to the skin after liquid is absorbed by a disposable liquid absorptive article containing a highly water absorptive polymer in a liquid absorbing material. SOLUTION: A liquid absorptive article 1 is composed of a nonextensible/ noncontractible liquid permeable surface sheet 2, an elastically extensible liquid impermeable reverse sheet 3 and a liquid absorbing material 4 containing highly water absorptive polymer particles by 5 to 98 wt.%. The surface sheet 2 is flat and the reverse sheet 3 presents a corrugated structure, and the surface and reverse sheets 2 and 3 are joined together in a top part of corrugation, and form a large number of mutually parallel tubular parts 10. The liquid absorbing material 4 is housed in the tubular parts 10. The reverse sheet 3 is a sheet elastically extensible/contractible by 505, or more, and 50% extensible stress of the reverse sheet 3 is set not more than 50% of tensile rupture stress of the surface sheet 2.

Description

DETAILED DESCRIPTION OF THE INVENTION

[0001]

TECHNICAL FIELD The present invention relates to a disposable diaper, sanitary napkin, panty liner, urine absorbing pad,
The present invention relates to a disposable liquid-absorbing article suitable for use as a blood-absorbing pad, a water-absorbing sheet for removing dirt, and the like.

[0002]

2. Description of the Related Art The sheet absorber disclosed in Japanese Patent Laid-Open No. 6-90777 is composed of a liquid-impermeable elastic sheet, a liquid-permeable nonwoven fabric and an absorbent. The elastic sheet and the nonwoven fabric are joined by a plurality of zones extending in parallel, and a channel is formed between adjacent zones by making the width of the nonwoven fabric larger than that of the elastic sheet. Each of the channels contains an absorbent containing a water-absorbing polymer. Such a sheet absorbent is used for a diaper or a sanitary napkin such that the nonwoven fabric is brought into contact with the skin, and the water-absorbing polymer that has absorbed body fluid swells to fill the voids in the channel, and further has Extend the seat and inflate the channel.

[0003]

The above-mentioned conventional absorber is
When the water-absorbing polymer swells and the absorbent material fills each channel, the side of the wide non-woven fabric swells and forms a ridge before the elastic sheet elongates, and the top of the ridge forms on the wearer's skin. Come into contact. In such a sheet absorbent body, the rigidity of the channel filled with the absorbent is high, and the skin may be locally strongly pressed at the top of the ridge to cause discomfort.

Therefore, an object of the present invention is to provide a disposable liquid-absorbent article which does not have a possibility of the skin being locally compressed as in the above-mentioned prior art.

[0005]

In order to solve the above problems, the present invention is based on the premise that a liquid absorbing material is interposed between a liquid-permeable top sheet and a liquid-impermeable back sheet. It is a disposable absorbent article.

On this assumption, the present invention is characterized in that the top sheet is a substantially non-stretchable sheet, and the back sheet is a sheet that is elastically stretchable by 50% or more, and The 50% elongation stress of the sheet is 50% or less of the tensile rupture stress of the top sheet, and the front and back sheets are joined in a plurality of bands extending in parallel with each other, and between the two adjacent bands, By making the inter-zone dimension of the back sheet larger than the dimension of the top sheet, the top sheet is flat, and the back sheet is curved in a direction from the front surface to the back surface of the article and extends along the band. Form a part,
The liquid absorbing material containing 5-98% by weight of superabsorbent polymer particles is contained in the tubular portion.

In one preferred embodiment of the present invention, the back sheet is elastically extensible at least in a direction perpendicular to a direction in which the band extends.

[0008] In another preferred embodiment of the present invention, a sheet having higher hydrophilicity than the topsheet is joined to the inner surface of the topsheet. Further, the highly hydrophilic sheet may have liquid diffusibility in a direction in which the band extends.

[0009]

DETAILED DESCRIPTION OF THE PREFERRED EMBODIMENTS The details of a disposable absorbent article according to the present invention will be described below with reference to the accompanying drawings.

FIG. 1 is a partial view of a panty liner 1 which is an example of a liquid-absorbent article, and is partially cut away.

FIG. 2 is a partial sectional view taken along the line II-II of FIG.

In FIGS. 1 and 2, a panty liner 1 is shown.
Is a liquid-permeable top sheet 2, a liquid-impermeable back sheet 3,
And a liquid absorbing material 4. The top sheet 2 has an inner surface 6
And an outer surface 7 and are in a flat state. Back sheet 3
Has an inner surface 8 and an outer surface 9 and repeats undulations in the width direction of the panty liner 1 (left-right direction in the figure) to exhibit a corrugated structure. Inner surface 6 of backsheet 2 and backsheet 3
And the inner surface 8 at the top of the corrugate is joined at a zone 11 extending in the front-rear direction of the panty liner 1,
A number of tubular portions 10 are formed. And if adjacent bands 11 are parallel to each other at a predetermined distance d _1, the distance d ₁ is equal to the width of the surface sheet 2 in the tubular portion 10. The width of the back sheet 3 between the zones 11 is larger than d ₁ , preferably 1.2 to 3.0 of d ₁ .
In the range of double. The separation distance d ₁ is particularly preferably in the range of 2 to 7 mm when the liquid-absorbent article is the panty liner 1 in the illustrated example. The width of the band 11 when the distance d ₁ is such a value is preferably in the range of 0.1 to 3 mm.

The liquid-absorbing material 4 comprises super-absorbent polymer particles of 5 to 5.
In addition to 98% by weight, pulverized pulp, hydrophobic thermoplastic synthetic fiber, a mixture of pulverized pulp and thermoplastic synthetic fiber, and the like 9
Contains 5 to 2% by weight.

The topsheet 2 is a sheet material such as a nonwoven fabric or a perforated plastic film, which is substantially non-stretchable.

The back sheet 3 is a sheet of rubber or elastomer that is elastically extensible at least 50% or more in the width direction of the panty liner 1, that is, in the direction orthogonal to the direction in which the band 11 extends. A material having an elongation stress at the time of 50% or less of the tensile rupture stress of the topsheet 2 is used.

For bonding the top sheet 2 and the back sheet 3 in the zone 11, an adhesive such as a hot melt adhesive can be used. When at least one of the sheets 2 and 3 is heat-meltable, a welding technique can be used. Such techniques include ultrasonic welding techniques.

The panty liner 1 constructed as described above
When the superabsorbent polymer swells due to the absorption of bodily fluid and the liquid absorbing material 4 fills the tubular portion 10, the back sheet 3 having a relatively low elongation stress expands as shown by the phantom line in FIG. The topsheet 2 is a non-extensible material that does not substantially expand even if the backsheet 3 extends, and maintains a flat state even when the superabsorbent polymer swells, There is almost no change in the state of contact with the skin. The panty liner 1 accommodates the liquid absorbing material 4 so that the liquid absorbing material 4 does not spill out of the tubular portion 10 by bonding or welding the front and back sheets 2 and 3 on the four circumferences.

[0018] In the panty liner 1, it can be combined a plurality of tubular portions 10 where the width d ₁ is different variously. For example, the tubular portions 10 having a large width d _{1 and} the tubular portions 10 having a small width are alternately arranged, or a group is formed by a plurality of tubular portions 10 having a large width d ₁ , and a plurality of the tubular portions 10 having a small width d ₁ are adjacent to the group. A group of tubular sections can also be arranged.

FIG. 3 shows one embodiment of the present invention.
FIG. In the panty liner 1, the intermediate sheet 16 is in contact with the inner surface 6 of the top sheet 2.
The intermediate sheet 16 has higher hydrophilicity than the topsheet 2. The intermediate sheet 16 further diffuses body fluid in the direction in which the zone 11 extends, that is, in the direction in which the tubular portion 10 extends, and more preferably the surface sheet 2 in that direction.
It has a higher diffusivity than that of. Intermediate sheet 1
Due to the presence of 6, the body fluid on the outer surface 7 of the topsheet can be quickly transferred to the liquid absorbing material 4 or diffused in the direction in which the tubular portion 10 extends and come into contact with the liquid absorbing material 4 over a wide range. Will be possible. The intermediate sheet 16 in the illustrated example is bonded to the front and back sheets 2 and 3 in the zone 11 via a hot melt adhesive. The intermediate sheet 16 is bonded to the topsheet 2 between the adjacent zones 11. Sometimes.

The liquid-absorbent article according to the present invention can be widely used as a body fluid-absorbent article, for example, the panty liner 1, and can also be used as a disposable water-absorbent wiper for wiping off dirt. Can be.

[0021]

According to the disposable absorbent article according to the present invention, when it is used in contact with the skin,
When the liquid-absorbing material containing the superabsorbent polymer swells, the elastic and stretchable back sheet not in contact with the skin expands, and the top sheet in contact with the skin maintains a flat state. There is no danger that the article will locally compress the wearer's skin due to the swelling of the water-absorbing polymer.

In an article in which a highly hydrophilic intermediate sheet is bonded to the inner surface of the topsheet, liquid such as body fluid on the outer surface of the topsheet can be promptly transferred to the liquid absorbing material. If the highly hydrophilic intermediate sheet is liquid-diffusing, it becomes easy for a wide range of liquid-absorbing material in the tubular portion to absorb body fluid and the like, and the liquid-absorbing speed of the article is improved.

[Brief description of the drawings]

FIG. 1 is a partial view of a liquid absorbent article (panty liner) cut away.

FIG. 2 is a sectional view taken along line II-II of FIG.

FIG. 3 is a drawing similar to FIG. 2 showing an example of the embodiment;

[Explanation of symbols]

 DESCRIPTION OF SYMBOLS 1 Liquid-absorbent article (panty liner) 2 Top sheet 3 Back sheet 4 Liquid-absorbent material 6 Inner surface 10 Tubular part 11 Band 16 Sheet

Claims (4)

[Claims] 1. A disposable liquid-absorbing article having a liquid-absorbing material interposed between a liquid-permeable topsheet and a liquid-impermeable backsheet, wherein the topsheet is substantially a non-stretchable sheet. Wherein the back sheet is an elastically extensible sheet of 50% or more, and the 50% elongation stress of the back sheet is 50% or less of the tensile breaking stress of the top sheet, and these front and back sheets are mutually separated. Joined in a plurality of zones extending in parallel, between the two adjacent zones, the inter-zone dimension of the back sheet is made larger than the dimension of the top sheet, so that the top sheet is flat. The back sheet is curved in a direction from the front surface to the back surface of the article to form a tubular portion extending along the band, and the liquid absorbing material containing 5 to 98% by weight of the superabsorbent polymer particles in the tubular portion is provided. Containment It said article characterized in that it has been. 2. The article according to claim 1, wherein the back sheet is elastically extensible at least in a direction orthogonal to a direction in which the band extends. 3. The article according to claim 1, wherein a sheet having a higher hydrophilicity than the top sheet is bonded to an inner surface of the top sheet. 4. The article according to claim 3, wherein the highly hydrophilic sheet has a liquid diffusivity in a direction in which the zone extends.