WO2001054640A1

WO2001054640A1 - Article for use in disposable clothes

Info

Publication number: WO2001054640A1
Application number: PCT/JP2001/000468
Authority: WO
Inventors: Satoshi Maeda; Kenji Nakaoka; Masaru Fujioka; Kazuyo Mori
Original assignee: Toyo Eizai Kabushiki Kaisha
Priority date: 2000-01-26
Filing date: 2001-01-25
Publication date: 2001-08-02
Also published as: JP4605971B2; AU2880601A

Abstract

An article for use in disposable clothes (1) having a top sheet (2) as an uppermost layer and a back sheet (5) as an undermost layer, characterized in that it has a layer (3) for temporary water-storage comprising a non-woven fabric having an areal density of 20 to 100 g/m2, and, under the layer (3), a water-absorbing sheet (4) having a non-woven fabric support (41) and, bound partly according to a given pattern to the bottom side thereof, a highly water absorbing composite composition (42) comprising a highly water absorbing resin and a wettable microfibril derived from cellulose or its derivative, and that the top sheet (2), the layer (3) for temporary water-storage and the water-absorbing sheet (4) are partly bound in one piece at a binding part (6).

Description

Description Disposable wearable article

Technical field

The present invention relates to disposable wearing articles such as napkins, disposable diapers, and disposable pants, and more specifically, can be made extremely thin because it does not use defibrated pulp fibers used in ordinary absorbents. Also relates to disposable wearing articles that exhibit good absorption properties. Background technology

Conventionally, fibrillated pulp fiber, water-absorbent resin powder, hot-melt fiber, etc. have been molded into a mat shape as an absorber for absorbing body fluids used as disposable diapers, disposable pants or napkins. However, an absorption mat was used, which was wrapped with thin paper and fixed.

Such an absorbent mat has a large thickness because it contains pulp fibers. The heat compression treatment has been attempted to bind the pulp fiber with heat-meltable fiber to form a thin shape, and the pulp fiber after absorbing water has a strong force to spread to the surrounding area. Eventually, the crotch portion of the diaper and the like bulged outward after urination, giving the wearer discomfort.

Recently, a superabsorbent composite composition was found in which a hydratable microfibril obtained from cellulose or a cellulose derivative was integrated with a superabsorbent resin, and these were applied to disposable wearing articles. (For example, Japanese Patent Application Laid-Open No. H10-168230).

When the above superabsorbent composite composition is applied to disposable wearing articles, if the conventionally used pulp fiber is not used at all, the water absorbing rate of the superabsorbent composite composition is low, so that a large amount of Urination and bleeding If so, there was a problem that side leakage was likely to occur. In addition, the sheet-shaped absorber having the structure in which the superabsorbent composite composition is supported by a nonwoven fabric has a problem in that, even when used in a wearing article, it is too thin to be easily dislodged when worn.

The present invention is based on the premise that the above-described superabsorbent composite composition is used in place of the conventional absorbent core composed of pulp fiber and superabsorbent resin powder, and is ultrathin and deformable. It is an object of the present invention to provide a disposable wearing article which does not cause buckling and can sufficiently exhibit its absorbing ability. Disclosure of the invention

The disposable wearing article of the present invention is a disposable wearing article having a top sheet on a top layer and a back sheet on a bottom layer, and has a basis weight of 20 to 100 gZ under the top sheet. with a temporary reservoir layer consisting of m ² nonwoven, on the lower side of the temporary reservoir layer, superabsorbent formed of Mi click Rofui Brill and superabsorbent polymer having hydration obtained from cellulose or a cellulose derivative conductor A sheet-like absorbent body in which a layer of the composite composition is partially joined to a lower side of the nonwoven fabric support according to a predetermined pattern, and the topsheet, the temporary water storage layer, and the sheet-like absorbent body are provided. They are integrally joined at the joint.

-Even if a large amount of urine or menstrual blood is discharged at one time due to the presence of the water reservoir, a bulky and thick nonwoven fabric is provided as a temporary water reservoir. As it diffuses, it gradually penetrates toward the lower sheet absorber. Therefore, it is possible to prevent the effluent exceeding the absorption capacity of the sheet-shaped absorber from being concentrated on a part of the sheet-shaped absorber layer, and to sufficiently exhibit the absorption capacity of the sheet-shaped absorber. It became possible. This eliminates inconveniences such as lateral leakage became. Furthermore, since the topsheet, the temporary reservoir and the sheet-like absorber were partially joined together, it was possible to prevent kinking and improve the shape stability of the worn article. BRIEF DESCRIPTION OF THE FIGURES

FIG. 1 is a partially cutaway plan view showing a typical embodiment of the present invention.

FIG. 2 is a schematic cross-sectional view of a sheet-shaped absorber.

FIG. 3 is a schematic cross-sectional view taken along line AA of FIG.

FIG. 4 is a schematic cross-sectional view taken along the line BB of FIG.

FIG. 5 is a schematic sectional view showing another typical embodiment of the present invention. BEST MODE FOR CARRYING OUT THE INVENTION

The disposable wearing article of the present invention is a disposable wearing article having a top sheet on a top layer and a back sheet on a bottom layer, and has a basis weight of 20 to 100 gZ under the top sheet. with a temporary reservoir layer consisting of m ² nonwoven, on the lower side of the temporary reservoir layer, superabsorbent formed of Mi click Rofui Buri Le and superabsorbent polymer having hydration obtained from cellulose or a cellulose derivative conductor A sheet-like absorbent body in which a layer of the water-soluble composite composition is partially bonded to the lower side of the nonwoven fabric support according to a predetermined pattern, and the topsheet, the temporary water storage layer, and the sheet-like absorbent body are They are integrally joined at the joint.

A configuration in which two or more sheet-like absorbers are stacked so that the superabsorbent composite composition layer of each sheet-like absorber is located on the lower side leads to an increase in absorption capacity, and the present invention This is a preferred embodiment. When the composite composition layer is positioned on the lower side, the non-woven fabric support is positioned on the upper side, and the discharged liquid diffuses toward the surface of the non-woven fabric support to the composite composition layer. As a result, the concentration of the discharged liquid only on a part of the sheet-like absorber is reduced, which is effective in preventing leakage.

The non-woven fabric for the temporary reservoir contains heat-meltable fibers and rayon fibers, and preferably contains at least 10% by mass of rayon fibers. A thermally bonded nonwoven fabric that fuses and bonds a part of the fiber by an air-through method (also referred to as a through-air method) is bulky and is therefore preferable as the temporary water storage layer of the present invention. Therefore, it is desirable to use heat-meltable fiber as an essential component. However, since the nonwoven fabric is inferior in hydrophilicity only with the heat-meltable fiber and may not be able to function as a temporary water storage layer, it is preferable that the nonwoven fabric contains 10% by mass or more of the rayon fiber.

Water-absorbing paper is further laminated below the sheet-shaped absorber, and the topsheet, the temporary storage layer, the sheet-shaped absorber, and the water-absorbing paper are partially joined together, and The configuration in which the lower back sheet and the water-absorbing paper are not joined at this joint is the most preferred embodiment of the present invention. The backsheet and the water-absorbing paper were applied intermittently, such as in the form of dots, spirals, etc., because the sheet-like absorber and the backsheet are easily joined when they are joined together at a single joint. It is preferable to join with a hot melt adhesive or the like.

In the disposable wearing article of the present invention, the layer of the superabsorbent composite composition formed from cellulose or a hydrated microfibril obtained from a cellulose derivative and the superabsorbent resin is formed of a nonwoven fabric support. On the lower side, a sheet-like absorber that is partially joined according to a predetermined pattern is provided. Microfibrils and composite compositions formed from the microfibrils and superabsorbent resins are described in detail in Japanese Patent Application Laid-Open No. H11-168230. That is, microfibrils are cellulose or cellulose derivatives. This is a very thin fibrous material with a diameter of less than 2.0 m, which can be obtained by grinding and highly beaten wood pulp (MFC, S-MFC) or by microbial metabolism of acetic acid bacteria (BC) . It exhibits extremely strong hydration and, when dispersed in a water-containing medium, hydrates and exhibits large viscosity. The superabsorbent resin is a known superabsorbent resin powder such as polyacrylate, cellulose, starch and acrylonitrile.

Microfibrils are mixed in a mixed solvent in which a hydrophilic organic solvent such as methanol or acetate and water are mixed in a range of 90/10 to 40/60 (mass ratio). A dispersion in which 3 to 1.0% by mass of the superabsorbent resin powder is dispersed in a range of 5 to 50% by mass is dispersed on a nonwoven fabric support, for example, in a 10-mm-wide streak pattern at intervals of 5 mm, and dried. Then, by removing the solvent, a sheet-like absorber in which the composite composition is separated and joined to one surface of the nonwoven fabric support can be obtained.

The microfibrils cover the surface of the superabsorbent resin particles, and the microfibrils self-join to form a network structure, and are firmly linked by ion-like hydrogen bonds. Since the nonwoven fabric support and the microfibrils are physically entangled with each other, the highly water-absorbent composite composition becomes a sheet-like absorber firmly bonded to the nonwoven fabric support.

The arrangement of the composite composition in the form of streaks takes into account the fact that the superabsorbent resin in the composite composition swells after absorbing water. May be partially bonded to the nonwoven fabric support. In addition, the arrangement pattern can be changed as appropriate according to the use, the sex of the wearer, and the like. On the other hand, the basis weight and constituent fibers of the nonwoven fabric support are not particularly limited, but those having a basis weight of 15 to 80 g Zm ² are preferred, and hydrophilic fibers such as cotton, rayon, and pulp; It is necessary to use polyethylene, polypropylene, polyester, etc. or their composite fibers. If necessary, those subjected to hydrophilic treatment can be used. Air-through thermal bonded nonwoven fabric, spunbonded nonwoven fabric, card dry nonwoven fabric and the like are preferable.

In the sheet-like absorbent body, it is also possible to provide a composite composition layer on both sides of the nonwoven fabric support. In the present invention, this layer is provided on one side of the nonwoven fabric support, and the composite composition is contained in the wearing article. It is preferred to arrange the layers so that they are on the lower side. Since the discharged liquid comes into contact with the nonwoven fabric support first, the liquid diffuses in the direction of the surface of the nonwoven fabric support and penetrates into the composite composition layer, thereby forming a part of the composite composition. Only the effluent can be prevented from concentrating. The sheet-shaped absorber may be stacked in a plurality of layers, and in each layer, it is preferable to dispose the composite composition layer on the lower side.

Hereinafter, the configuration of the disposable wearing article of the present invention will be described with reference to the drawings. In the example shown in the figures, a worn article having a shape that can be used for a napkin or a disposable urine collecting pad is shown, but the worn article of the present invention is not limited to the shape shown in FIG. It is also possible to change to the shape of disposable pants.

FIG. 1 shows a partially cutaway plan view of one embodiment of the disposable wearing article 1 of the present invention. In the wearing article 1 shown in FIG. 1, a cocoon-shaped topsheet 2 is located on the uppermost layer, and a backsheet 5 having the same shape as the topsheet 2 is located on the lowermost layer. At least the periphery of both sheets 2 and 5 is bonded with a heat seal or a hot melt adhesive. Between the sheets 2 and 5, from the top (top sheet 2 side), there is a rectangular temporary storage layer 3 and a sheet-like absorber 4 that is slightly smaller than the top sheet 2. It has been formed. As shown in the cross-sectional view of FIG. 2, the sheet-shaped absorber 4 has a composite composition layer 42 laminated on a non-woven fabric support 41 in a streak shape. Top sheet 2 includes nonwoven fabrics made of hydrophilic fibers such as cotton, rayon, and pulp, fibers such as polyethylene, polypropylene, and polyester, and hydrophobic fibers such as composite fibers of these. A water-permeable nonwoven fabric obtained by hydrophilizing a nonwoven fabric made of fibers, a nonwoven fabric formed by mixing the above hydrophilic fibers and hydrophobic fibers, a plastic film having a large number of apertures, and the like are used.

As the knock sheet 5, a liquid-impervious plastic film, a fine or non-perforated moisture-permeable film, a water-repellent nonwoven fabric, a laminate of a nonwoven fabric and a film, and the like should be appropriately selected. Can be.

FIG. 3 is a cross-sectional view taken along line AA of FIG. 1, and FIG. 4 is a cross-sectional view taken along line B-B of FIG. Reference numeral 6 denotes a joint. The joint 6 joins the topsheet ₂ , the temporary storage layer 3, and the sheet-like absorber 4 to the body. The back sheet 5 is not joined at the joint 6. The sheet-like absorber 4 can follow the movement of the topsheet 2 by joining the sheet-like absorber 4 not only to the temporary reservoir 3 but also to the topsheet 2 at the joint 6. Thus, it is possible to effectively prevent only the sheet-shaped absorber 4 from being distorted. Although not shown in the figure, it is preferable that the back sheet 5 and the sheet-shaped absorber 4 are joined with a dot-shaped, spiral-shaped, or other intermittently applied hot-melt adhesive or the like. . The same applies to the case where water absorbing paper is interposed.

The length, position, number, and shape of the joint 6 are not limited to those shown in the drawings, and may be three or more, or may extend over the entire length of the temporary reservoir 3. In addition to the linear shape in the longitudinal direction, a bent line, a curved line, a dot, a pattern, and the like can be appropriately selected. A heat seal is a simple joining method. Since it is difficult to heat seal the portion where the composite composition layer 42 exists, it is recommended to join the nonwoven fabric support 41.

As shown in Fig. 5, when a configuration in which water-absorbing paper 7 is further laminated is adopted, In this case, the topsheet 2, the temporary storage layer 3, the sheet-like absorber 4, and the water-absorbing paper 7 may be press-bonded together with a heat seal. Note that since the water-absorbing paper 7 is not sufficiently joined only by heat and pressure of the heat seal, a portion corresponding to the joint 6 of the water-absorbing paper 7 (on the contact surface side of the sheet-like absorbent body 4) is previously hot-sealed. It is recommended to apply a melt adhesive. Instead of absorbent paper, provide an absorbent layer made of pulp fibers or a layer wrapped with absorbent paper or non-woven fabric, if the thickness of the disposable wearable article is not too thick. You may.

Although the composite composition layer 42 swells after absorbing water, if the adjacent composite composition layers come into close contact with each other after swelling, the water absorption capacity is reduced, so the separation distance of the composite composition layer 42 is taken into consideration. At the same time, it is preferable that a space is left around the composite composition layer 42 when the joint 6 is formed.

Is in a temporary reservoir layer 3, it is necessary to have use of the basis weight 2 0 ~ 1 0 0 g Z m 2 nonwoven. This is because the disposable wearing article can serve as a temporary reservoir without increasing the thickness of the entire disposable article. That is, since the nonwoven fabric having the basis weight in the above range is bulky, the discharged liquid passing through the top sheet 2 gradually penetrates downward in the thickness direction of the nonwoven fabric for the temporary reservoir 3. From this, the speed of the effluent passing through the top sheet 2 to penetrate into the lower sheet-like absorber 4 is slowed, and can play a role of temporarily storing the effluent. . As a result, it is possible to prevent the discharged liquid in an amount exceeding the absorption capacity of the sheet-shaped absorber 4 from permeating into the sheet-shaped absorber 4. In addition, since the discharged liquid also diffuses in the surface direction of the non-woven fabric for the temporary storage layer 3, the speed at which the discharged liquid permeates the sheet-like absorber 4 can be further reduced, and Concentration of the effluent on a part of the monolithic absorber 4 can also be prevented. As the temporary storage layer 3, an air-through thermal non-woven fabric is particularly preferable because it is bulky and thick. This nonwoven fabric needs to contain heat-meltable fibers because a part of the fibers is melted and bonded by hot air. Examples of the heat-meltable fiber include polyethylene, polypropylene, polyester fiber and the like, and composite fibers thereof (core-sheath, side-by-side, etc.) are also preferable. The heat-meltable fiber alone is inferior in hydrophilicity, and lacks the ability to draw the liquid from the top sheet 2 into the temporary reservoir 3, so that the discharged liquid may remain on the surface of the top sheet 2. Therefore, in order to impart hydrophilicity to the nonwoven fabric, it is preferable that the nonwoven fabric contains 10% by mass or more of hydrophilic fibers, for example, rayon fibers. It is also effective to perform a hydrophilic treatment before or after the formation of the nonwoven fabric. Further, two or more thermal-bonded non-woven fabrics or non-woven fabrics obtained by other manufacturing methods may be laminated so that the basis weight as a whole falls within the above specified range.

The shape of the temporary reservoir 3 is not limited to the illustrated rectangle. Considering the diffusion effect of the liquid in the plane direction, a large area is preferable, and therefore, may have the same shape as the sheet-shaped absorber 4, but when the spot from which the discharged liquid is discharged is limited. However, for example, a configuration in which a temporary reservoir is provided only in the vicinity of the spot, such as in the front of the pad in the longitudinal direction of the pad for male urine pad, and near the center of the napkin, etc. Good.

As described above, the sheet-shaped absorber 4 may be laminated in a plurality of layers, and is arranged such that the composite composition layer 42 is located on the lower side. Further, a configuration in which the temporary storage layer 3 and the sheet-shaped absorber 4 are alternately stacked may be adopted. Industrial applicability

Since the present invention is configured as described above, even if it is ultra-thin, It was possible to provide a disposable wearing article which is excellent in water performance and has little deformation. Therefore, it can be used for disposable pants, disposable diapers, urine collection pads, napkins, etc. In addition, the disposable wearing article of the present invention is used for a water retention / water absorption material for agriculture, a concrete curing mat, a dew condensation preventing sheet, a poultice, a patch, a cosmetic, etc. in addition to the sanitary material field. be able to.

Claims

The scope of the claims

1. A disposable wearing article having a top sheet on the top layer and a back sheet on the bottom layer,

Below the bets Ppushi bets, with a temporary reservoir layer consisting of basis weight 2 0 ~ 1 0 0 g Z m 2 nonwoven, on the lower side of the temporary reservoir layer, a hydratable cellulose or obtained from cellulose derivatives A sheet-like absorbent body, in which a layer of a superabsorbent composite composition formed of microfibrils and a superabsorbent resin, is partially joined to a lower side of a nonwoven fabric support according to a predetermined pattern. Prepare and

A disposable wearing article characterized in that a topsheet, a temporary water storage layer, and a sheet-like absorber are joined together at a joint.

2. The disposable wear according to claim 1, wherein the sheet-shaped absorber is laminated so that two or more layers, and the superabsorbent composite composition layer of each sheet-shaped absorber is located on the lower side. Goods.

3. The nonwoven fabric for the time-reservoir layer contains heat-meltable fibers and rayon fibers, and contains at least 10% by mass of rayon fibers. Disposable wearing article.

4. Water-absorbing paper is further laminated under the sheet-shaped absorber, and the topsheet, the temporary storage layer, the sheet-shaped absorber, and the water-absorbing paper are partially joined together and absorb water. The disposable wearing article according to any one of claims 1 to 3, wherein the backsheet on the lower side of the paper and the water-absorbing paper are not joined at the integral joint.