JPH06269475A - Article for treating body fluid and their production - Google Patents

Abstract

PURPOSE:To provide an article for treating body fluid which easily inflates to a rear surface sheet side. CONSTITUTION:The article 1 for treating the body fluid consists of a liquid permeable front surface sheet 2, a rear surface sheet 3 and a liquid absorvent material 4 interposed between these two sheets 2 and 3. The rear surface sheet 3 is formed more easily stretchable than the front surface sheet 2.

Description

Detailed Description of the Invention

[0001]

BACKGROUND OF THE INVENTION 1. Field of the Invention The present invention relates to a body fluid treatment product for use in breast milk pads, sanitary napkins, disposable diapers and the like.

[0002]

2. Description of the Related Art Heretofore, a body fluid treatment article in which a liquid-absorbent material is interposed between front and back sheets is known in which front and back sheets are partially integrally joined. For example, in Japanese Utility Model Laid-Open No. 57-156148, among sheets covering the front and back surfaces of an absorbent body made of a liquid-absorbent material such as crushed pulp and water-absorbent polymer, the surface sheet is a nonwoven fabric, Japanese paper,
A liquid-permeable material made of synthetic fiber, etc., and a liquid-impermeable back sheet made of synthetic resin film, etc., are integrally joined to each other in a state of partially digging in the thickness direction of the absorber. A fixed body fluid treatment article is disclosed. With this body fluid treatment product, even when an external force that deforms it when worn is applied, the surface sheet is always in close contact with the absorbent body without being separated from the upper surface of the absorbent body. Smooth transfer of body fluids to the body.

[0003]

The absorbent body containing the superabsorbent polymer may have a significantly large volume due to the swelling of the polymer when absorbing body fluid.
In that case, in the body fluid treatment article of the above-mentioned known technology, the front and back sheets are joined to seal the free movement of these sheets and the absorber, so that the absorber is deformed so as to expand in the thickness direction. Easy to do. Particularly when the topsheet is made of a non-woven fabric having a relatively small basis weight and a small elongation stress, the topsheet tends to swell. When the absorbent body bulges in such a manner, the surface sheet has a large difference in the unevenness between the portion that is eaten toward the back sheet and the portion that is not, and the surface sheet loses its original surface state and becomes rugged. There is a problem in that the feeling becomes unpleasant and the feeling of wearing is impaired, and there is also a problem in that body fluid accumulates in the part that eats in such a way and impairs the feeling of wearing.

Therefore, the present invention has an object to solve the above-mentioned problems of the prior art by making the back sheet of the body fluid treatment article more extensible than the top sheet.

[0005]

[Means for Solving the Problems] The present invention provides means for solving the above problems as follows.

In the body fluid treatment article according to the present invention,
A liquid-absorbent material is interposed between the skin-contacting liquid-permeable topsheet and the non-skin-contacting backsheet, and the front and backsheets are partially or directly with each other through the liquid-absorbent material. It is premised on a body fluid treatment product that is integrally joined.

Under such a premise, it is a feature of the present invention that the backsheet is more stretchable than the topsheet.

In a preferred embodiment of the present invention, the surface of the topsheet is substantially flat, and the backsheet has a portion which is partially joined in a cross section taken in the thickness direction of the body fluid treatment article. , A part separated from the surface sheet, and the separated part is filled with a liquid-absorbent material between the front and back sheets, and the separated parts adjacent to each other are required in the surface direction of the body fluid treatment article. They are arranged at intervals.

In another preferred embodiment of the present invention, the liquid-absorbent material is composed of crushed pulp and superabsorbent polymer, and in the thickness direction of the separated portions,
Super absorbent polymer is concentrated near the back sheet.

Further, the method for producing a body fluid treatment article according to the present invention is characterized by including at least the following steps. (A) A step of producing a meltblown nonwoven fabric having a substantially flat surface and a large number of recesses formed from the surface toward the back surface and adjacent to each other with a required gap. (B) A step of supplying a liquid-absorbent material to the concave portion of the meltblown nonwoven fabric. (C) A step of supplying a skin-contacting liquid-permeable sheet that is more stretchable than the nonwoven fabric to the surface of the meltblown nonwoven fabric to which the liquid-absorbent material has been supplied. (D) A step of joining the meltblown nonwoven fabric and the liquid-permeable sheet directly on the flat surface of the nonwoven fabric or indirectly through the liquid-absorbent material.

[0011]

In the body fluid treatment product configured as described above, when the liquid absorbing material absorbs the liquid, the easily stretchable back sheet swells. The topsheet does not swell, so this topsheet loses its initial feel and feels rugged,
There is no such thing.

The back sheet can be expanded in the lateral direction by forming a required gap between the adjacent spaced apart portions.

In order to produce such a body fluid treatment product, a liquid-absorbent material is supplied onto a meltblown nonwoven fabric having a flat surface and concave portions, and a liquid-permeable sheet which is harder to stretch than the nonwoven fabric is further provided thereon. To bond directly or indirectly to the meltblown nonwoven fabric. The liquid-permeable sheet is used as the skin-contacting front surface sheet, and the meltblown nonwoven fabric is used as the non-skin-contacting back surface sheet.

[0014]

The details of the body fluid treatment product according to the present invention will be described below with reference to the accompanying drawings, taking a sanitary napkin as an example.

1 and 2 are a partially cutaway perspective view and a partially enlarged perspective view of a sanitary napkin 1. The napkin 1 is a waterproof sheet on the back sheet 3 side of a main portion 20 composed of a skin-contacting top sheet 2, a non-skin-contacting back sheet 3, and a liquid-absorbent material 4 interposed between these sheets 2, 3. It is configured by covering with 5.

The topsheet 2 is a polyethylene sheet having a thickness of 0.015 to 0.04 mm and a large number of holes 7 having a hole diameter of 0.3 to 5 mm which does not allow the liquid absorbent material 4 to pass therethrough. The presence of 7 provides liquid permeability.

The back sheet 3 is composed of melt blown fibers of polyethylene having a denier of 0.5 to 5 and a basis weight of 10 to 2.
It is a non-woven fabric of 5 g / m ² and has a smaller elongation stress than the surface sheet 2 and is easily stretchable.

The liquid-absorbent material 4 is a highly water-absorbent polymer powder.
Pulverized pulp containing ~ 15% by weight, which can be combined so as not to separate from each other if necessary.

The waterproof sheet 5 has a thickness of 0.02 to 0.04.
mm polyethylene sheet.

The back sheet 3 has a flat portion 10 and a bowl-shaped recess 11 independent of each other. The back sheet 3 is welded to the top sheet 2 in the flat portion 10 and is separated from the top sheet 2 in the recess 11. The concave portion 11 has a required space 12, 1 vertically and horizontally.
3 is placed apart. The concave portion 11 is filled with the liquid absorbing material 4, and the material 4 can absorb and retain the body fluid on the topsheet 2 through the openings 7.

The waterproof sheet 5 is integrally welded to the front and back sheets 2 and 3 by the seal line 19 on the four circumferences of the napkin 1. This sheet 5 is for preventing bodily fluid from seeping out from the back sheet 3 and contaminating clothes, and is unnecessary when the back sheet 3 is liquid impermeable.

FIG. 3 is a sectional view taken along the line XX of FIG. 2, and shows a state when the liquid-absorbent material 4 absorbs liquid and the backsheet 3 swells by an imaginary line. In the napkin 1, as the superabsorbent polymer powder absorbs the liquid and swells, the recess 11 made of the easily stretchable meltblown nonwoven fabric swells. However, the napkin 1 in a worn state generally receives a strong compressive force in the thickness direction, and is unlikely to expand in that direction. However, in this napkin 1, since the gaps 12 and 13 having a required width are provided between the adjacent recesses 11, the backsheet 3 can swell in the lateral direction. On the other hand, the topsheet 2 does not remain flat and swell and become rugged.

FIG. 4 shows a top sheet 2 and a back sheet 3.
FIG. 3 is a schematic view of a process for manufacturing the main body portion 20 of the sanitary napkin 1 including the liquid-absorbent material 4 and the liquid-absorbent material 4. This step is performed by the endless belt 101 and the belt 101 that rotate leftward.
The melt blow extruder 102, the super absorbent polymer powder supply device 103, and the pulverized pulp supply device 10 located above
4, a perforated polyethylene film supply device 105, a heating roll 106 for welding, and a vacuum suction device 107 arranged at a required portion on the back surface side of the belt 101. Belt 1
Reference numeral 01 denotes a metal, which is a flat surface 110, a large number of bowl-shaped recesses 111 independent from each other arranged at a required pitch in the rotation direction and the width direction, and a large number of fine holes for vacuum suction of meltblown fibers. And holes (not shown). The extruder 102 is of a well-known technique,
Spray the meltblown fiber toward 01 and belt 1
01 flat surface 110 and flat surface 1 following the shape of the recess 111
A meltblown nonwoven fabric 115 having 0 and recesses 11 can be made. Super absorbent polymer powder feeder 1
03 supplies the superabsorbent polymer powder to the recess 11 formed in the nonwoven fabric 115. Pulverized pulp feeder 104
Feeds ground pulp onto superabsorbent polymer powder. From the polyethylene film supply device 105, a polyethylene film 116 in which liquid-permeable openings to be the surface sheet 2 are formed in advance is supplied onto the nonwoven fabric 115 to which the superabsorbent polymer powder and crushed pulp have been supplied. . Subsequently, the polyethylene film 116 and the non-woven fabric 115 are welded to each other on the flat surface 10 of the non-woven fabric 115 by the heating roll 106 to form the main body portion 20. The main body portion 20 can be made into a napkin 1 by welding a waterproof sheet to the nonwoven fabric 115 side and then cutting it into a desired shape.

The superabsorbent polymer powder and the crushed pulp supplied in this step together constitute the liquid absorbing material 4 of the napkin 1. The polymer powder is
The pulverized pulp may be supplied after being supplied a little, or as a mixture with the pulverized pulp. However, since the superabsorbent polymer powder may swell to form a block, which may prevent the liquid from penetrating into the lower layer, the recess 11
In the above, the pulp is mainly arranged in the vicinity of the top sheet 2, and the super absorbent polymer powder is arranged under this pulp layer, preferably near the back sheet 3.

The front and back sheets 2 and 3 may be directly joined to each other, or may be indirectly joined by interposing a small amount of the liquid absorbing material 4 therebetween. When the liquid-absorbent material 4 is interposed, it is preferable to bond both sheets 2 and 3 with an adhesive or a pressure-sensitive adhesive.

FIG. 5 is a perspective view showing an example of the main portion 20 of the napkin 1. As shown in this figure, the recess 11 may be a groove continuous in one direction.

The topsheet 2 may be a non-woven fabric or a thermoplastic synthetic resin sheet provided with a liquid guiding tube extending from the front surface toward the back surface and tapered from the base end to the bottom end.

[0028]

EFFECTS OF THE INVENTION In the body fluid treatment article thus constructed,
While the surface of the topsheet is flattened, the backsheet is provided with recesses and the backsheet is more extensible than the topsheet, so that this treated article swells to the back side when liquid is absorbed. The topsheet does not lose its flatness, and therefore, there is no unevenness on the surface and it does not give a rugged feeling, or body fluid accumulates in the recesses and does not impair the wearing feeling.

Since the recesses of the back sheet are arranged at a required interval from each other, the recesses can swell in the lateral direction even when a pressing force acts in the thickness direction of the processing article.

[Brief description of drawings]

FIG. 1 is a partially cutaway perspective view of a sanitary napkin.

FIG. 2 is a partially enlarged perspective view of a sanitary napkin.

FIG. 3 is a sectional view taken along line XX of FIG.

FIG. 4 is a manufacturing process drawing of the main part of the napkin.

FIG. 5 is a perspective view showing an example of a main portion of a napkin.

[Explanation of symbols]

 1 Body fluid treatment article (sanitary napkin) 2 Topsheet 3 Backsheet 4 Absorber 10 Flat part 11 Separated part (concave part) 12,13 Interval 115 Meltblown nonwoven fabric 116 Liquid permeable sheet (polyethylene sheet)

Claims (4)

[Claims] 1. A liquid-absorbent material is interposed between a skin-contacting liquid-permeable topsheet and a non-skin-contacting backsheet, and the front and backsheets are directly or indirectly via the liquid-absorbent material. In the body fluid treatment product obtained by partially integrally joining with each other, the back sheet is more extensible than the top sheet, and the treatment article is characterized in that. 2. A surface of the topsheet is substantially flat, and a part of the backsheet that is partially joined in a cross section taken in the thickness direction of the treatment article and a part that is separated from the topsheet. The liquid-absorbent material is filled between the front and back sheets in the separated part, and the separated parts adjacent to each other are arranged with a required interval in the surface direction of the processing article. The processing article according to claim 1. 3. The liquid absorbing material is composed of crushed pulp and a super absorbent polymer, and the super absorbent polymer is concentratedly distributed near the back sheet in the thickness direction of the separated portions. The processing article according to claim 2. 4. A method for manufacturing a body fluid treatment article, which comprises at least the following steps. (1) A step of producing a meltblown non-woven fabric having a substantially flat surface and a large number of concave portions which are formed from the surface toward the back surface and are adjacent to each other with a required gap. (2) A step of supplying a liquid-absorbent material to the recesses of the meltblown nonwoven fabric. (3) A step of supplying a skin-contacting liquid-permeable sheet that is more stretchable than the nonwoven fabric to the surface of the meltblown nonwoven fabric to which the liquid-absorbent material has been supplied. (4) The meltblown nonwoven fabric and the liquid-permeable sheet,
The step of integrally joining directly on the flat surface or indirectly via the liquid absorbing material.