KR100584691B1 - Disposable Liquid Absorbent Wear Items - Google Patents

Abstract

The present invention relates to a breathable disposable fluid absorbent article.

The disposable body fluid absorbent wear article (panty liner) is a surface which is hydrophilic, preferably made of cellulose-based fibers, breathable, body fluid absorbent, and has a plurality of pores having a diameter of 0.3 to 3 mm. Sheet 6; Breathable back sheet 7; And an intermediate sheet layer comprised of several sheets of breathable thermoplastic synthetic fibrous nonwoven fabrics 12, 13, 14 interposed between these surface sheets 6 and the back sheet 7 and containing a fluid-resistant melt blown nonwoven fabric 12. It consists of (8).

Description

Disposable body fluid absorbent wear article

The present invention relates to a disposable body fluid absorbent wear article, and more particularly, to a disposable body fluid absorbent wear article suitable for absorbing thin and relatively small amounts of body fluid, such as a panty liner or the like.

In US Pat. No. 4,950,264, a relatively thin sanitary napkin is disclosed. This sanitary napkin is equipped with a liquid permeable top sheet, an impermeable barrier sheet, and a liquid absorptive core interposed between these sheets. It is described that the barrier sheet can use a polyethylene film which is impermeable to air. As the core, a wood pulp or a laminate made of two tissue papers and a hydrogel-forming material interposed therebetween was used.

In addition, in the sanitary napkin disclosed in Japanese Patent Laid-Open No. 6-38815, the upper surface of the absorber is coated with a fluid permeable cover, and the lower surface is covered with a breathable and fluid impermeable buffalo. It is considered that the sanitary napkin having such a configuration can have air permeability in the thickness direction of the sanitary napkin by using conventional milled pulp well known in the art.

The thin sanitary napkin described in US Patent No. 4,950, 264 may increase the rigidity of the sanitary napkin as the content of the hydrogel forming material contained in the core increases, thereby impairing the adhesion to the skin. This is because, since the substance is usually hard and fine particles, it is difficult to maintain the shape of the core unless the core having a high content thereof is not pressurized, and more preferably, it is not pressurized in a wet state to form a mass. In addition, the polyethylene film used for the barrier sheet may make an unpleasant sound when handling a sanitary napkin.

When the fluid permeable cover or absorber of the sanitary napkin disclosed in Japanese Patent Publication No. Hei 6-38815 is absorbed with the body fluid, the air permeable pores formed in the cover or the absorber are blocked by the body fluid and the breathability in the thickness direction of the sanitary napkin Lost.

Under such circumstances, the problem of the present invention is to provide a relatively thin disposable body fluid absorbent wear article which can maintain good breathability even after the absorption of body fluid.

MEANS TO SOLVE THE PROBLEM In order to solve the said subject, the present invention presupposes a disposable body fluid absorbent wear article which consists of a breathable surface sheet, a breathable backsheet, and the breathable intermediate | middle layer sheet interposed between these sheets.

In view of the above, the present invention is characterized in that the surface sheet is a body fluid absorbent nonwoven fabric made of hydrophilic fibers and has a plurality of perforations having a pore diameter of 0.3 to 3 mm, and the back sheet is 1 to 8 d. It is a nonwoven fabric made of thermoplastic synthetic fibers, wherein the interlayer sheet is composed of a plurality of thermoplastic synthetic fiber nonwoven fabrics containing at least a liquid-resistant and breathable melt blown nonwoven fabric.

In a preferred embodiment of the present invention, the hydrophilic nonwoven fabric is a nonwoven fabric composed of cellulose fibers, and the nonwoven fabric is a spunlace nonwoven fabric composed of any one of cotton, pulp, rayon, and acetate, and the nonwoven fabric composed of the cellulose fibers. The basis weight is 15 to 70 g / m 2. The center spacing between adjacent ones of the plurality of perforations is in the range of 1 to 10 mm. In addition, the basis weight of the melt blown nonwoven fabric is 10 to 30 g / m 2.

Hereinafter, the present invention will be described in detail with a pantiliner as an example of a disposable body fluid absorbent wear article.

1 and 2 are perspective views of the pantiliner 1, and sectional views of the main parts along the II-II line thereof. The panty liner 1 has a surface 2 in contact with the wearer's skin, a back surface 3 in contact with the wearing pants, and a thickness t between these tables and back surfaces 2, 3, and the thickness t The sheet sheet is laminated with the front sheet 6, the back sheet 7, and the intermediate sheet layer 8 interposed between these sheets 6,7.

The surface sheet 6 is perforated with a diameter D of 0.3 to 3 mm in a liquid-absorbing fibrous web in which a basis weight of 15 to 70 g / m 2 hydrophilic fibers, preferably cellulose fibers are confounded with each other. (11) is formed so that the center space | interval of adjacent perforation 11 may become 1-10 mm. The fiber web has air permeability in the fiber gap, and the sheet 6 in which the perforation 11 is formed in the web has air permeability in the fiber gap and the perforation 11. Examples of hydrophilic fibers include cotton, pulp, rayon, acetate, so-called known sweat absorbing fibers that hydrophilize the surfaces of hydrophobic fibers, and these fibers are processed alone or in combination into webs. Such webs include nonwoven fabrics, random webs, parallel webs, and the like, but nonwoven fabrics, in particular, spunlace nonwoven fabrics, are preferred, and the machine direction at the time of manufacture is the longitudinal direction of the pantyliner, and cotton is used as the fiber. . Since cotton generally has a fiber length of about 10 to 50 mm, in spunlace nonwoven fabrics prepared by treating the web with high pressure jet streams, the effect of relatively high tensile strength and the prevention of fiber omission is obtained as the fibers are intricately intertwined with each other. Can be obtained. In addition, this nonwoven fabric has a good feel and excellent liquid absorption characteristic of cotton. The perforations 11 of the surface sheet 6 may be formed by known or well-known means, for example, formed by pressing the web with a pair of emboss rolls, or by applying a high pressure jet stream to the web on a support having a plurality of protrusions. It can be formed by rearranging the fibers to be in close contact with the circumferential wall of the protrusion.

As the back sheet 7, a point-bonded nonwoven fabric having a basis weight of 10 to 50 g / m 2 made of thermoplastic synthetic fibers having a fineness of 1 to 8 d was used. Such a nonwoven fabric is formed of welding points (not shown) in which fibers are welded to each other intermittently under heating and pressure to form an area of about 0.5 to 5 mm 2, and has breathability and high tensile strength. At the welding point, the fibers are welded to each other to form a film, and these points occupy 10 to 70% of the surface area of the back sheet 7. The welding point is preferably distributed in the entire back sheet 7 in the same manner. However, the welding point may be localized at a specific site within a range that does not significantly impair breathability of the back sheet 7.

The intermediate sheet layer 8 includes a leakage preventing sheet 12 from the back sheet 7 to the surface sheet 6, a reinforcing sheet 13 for improving the tensile strength of the leakage preventing sheet 12, and a liner 1. ), The cushion sheets 14 for increasing the volume by flexibly are stacked in this order. The leakage preventing sheet 12 prevents or prevents the infiltration of body fluids so that the body fluids absorbed by the surface sheet 6 do not reach the back sheet 7 even though the body fluids may infiltrate the intermediate sheet layer 8. . As the leakage preventing sheet 12, a melt blown nonwoven fabric having a basis weight of 10 to 30 g / m 2 using a thermoplastic synthetic resin such as polypropylene resin as a raw material is used. This nonwoven fabric is equipped with the practical air permeability required when used for a body fluid absorbent wear article, and the permeation resistance which prevents or suppresses permeation of a body fluid. This nonwoven fabric is formed of melt blown fibers having a fineness of 1d or less, and has a softness such as cloth, so that even when bent, it does not sound as if it is a plastic film. However, these nonwoven fabrics generally do not have the tensile and frictional strength that the surface coating of the body fluid absorbent wear article can have. The reinforcing sheet 13 is bonded to the melt blown nonwoven fabric to improve the strength of the nonwoven fabric, and a span bond nonwoven fabric made of thermoplastic synthetic fibers such as polypropylene fibers having fineness of 1 to 8 d is used, and the basis weight thereof is used. Is 10 to 40 g / m 2. The cushion sheet 14 is a bulky nonwoven fabric made of crimped composite fibers having a fineness of 1 to 8 d, and has a basis weight of 10 to 50 g / m 2. As an example of the composite fiber which can be used, sheath and core type | mold fiber or side-by-side type composite fiber comprised from polyester fiber and polyethylene fiber is mentioned. Such composite fibers may be mechanically entangled and / or welded and entangled with each other. The nonwoven fabric in the latter case can give the pantiliner 1 particularly high cushioning properties.

In Fig. 2, the back sheet 7, the leakage preventing sheet 12, the reinforcing sheet 13, the cushion sheet 14, and the surface sheet 6 which are in a laminated state are each in contact with each other. It is intermittently joined so that the breathability of the sheet may not be significantly impaired. In this bonding, an adhesive such as a hot melt welding agent can be used, and the sheets can also be intermittently welded to each other by other methods. The adhesive 21 is apply | coated to the lower surface of the back sheet 7 in a laminated state, and the lower surface of the adhesive 21 is coat-protected by the release paper 22. As shown in FIG. The adhesive 21 is for fixing the liner 1 to the wearing pants so as to be peeled off, and is applied intermittently so as not to interfere with the breathability of the back sheet 7.

Since the pantiliner 1 comprised in this way is laminated | stacked several sheets of breathable sheets so that these breathability may not be impaired, it has air permeability in the thickness direction. In the worn liner 1, body fluid is absorbed and retained by the surface sheet 6. Since each sheet located below the surface sheet 6 is a hydrophobic thermoplastic synthetic fiber, the body fluid absorbed by the surface sheet 6 hardly moves from the surface sheet 6 to the intermediate sheet layer 8. However, when the amount of body fluid is excessive compared to the amount of liquid absorbed by the liner 1, or when a large body pressure is imposed on the liner 1, the transfer of the body fluid may be performed.

In the surface sheet 6, the diameter D of the perforations 11 is much larger than the gap between the cotton fibers forming the web, so that when the excreted body fluid enters the perforations 11, the sheet around the perforations 11 is formed. As long as the liquid absorption amount of (6) is not saturated, the body fluid is absorbed by the cotton fibers of the periphery wall 11 and disappears from the perforation 11. Since the hydrophobic cushion sheet 14 exists below the perforation 11, the body fluid in the perforation 11 moves from the perforation 11 into the liner 1, and the cushion sheet 14, the leak-proof sheet 12, or the like. The gaps between the fibers are not blocked to impair the breathability of these sheets. Therefore, when the body fluid is lost from the perforation 11, the liner 1 maintains breathability in the thickness direction again by the perforation 11.

Disposable body fluid absorbent wear articles according to the present invention can be used as sanitary napkins, incontinence pads for blood incontinence, blood absorption pads, and the like, in addition to the panty liner 1 of the illustrated example.

Disposable body fluid absorbent wear articles according to the present invention are thin and breathable because the non-woven fabric made of a thermoplastic synthetic fiber superimposed on the sheet has a liquid permeation resistance and breathability.

Since the spunlace nonwoven fabric which does not have the cellulose fiber welding or the fiber joint part by the binder was used as a surface sheet, this article has a touch and good water absorption.

The surface sheet can maintain excellent air permeability even after the discharge of the body fluid in the perforation having a diameter of 0.3 to 3 mm.

In addition, by using the melt blown nonwoven fabric as the liquid permeable resistant sheet, there is no audible noise as in the case of using the air impermeable plastic film.

1 is a perspective view of a panty liner.

2 is a cross-sectional view of a main part taken along the line II-II of FIG. 1;

<Explanation of symbols for main parts of drawing>

1: Body Absorbent Wear Items (Pantiliner)

6: surface sheet

7: backing sheet

11: perforation

12,13,14: intermediate sheet layer

Claims (5)

A disposable body fluid absorbent wear article composed of a breathable surface sheet, a breathable backsheet, and a breathable interlayer sheet interposed between these sheets, The surface sheet is a body fluid absorbent nonwoven fabric made of hydrophilic fibers, and has a plurality of holes having a diameter of 0.3-3 mm, The back sheet is a nonwoven fabric composed of 1-8 denier thermoplastic synthetic fibers, And wherein said interlayer sheet is comprised of several sheets of thermoplastic synthetic fiber nonwovens containing at least a liquid permeable or breathable melt blown nonwoven. The wear article according to claim 1, wherein the hydrophilic nonwoven fabric is a nonwoven fabric of cellulose fiber and the nonwoven fabric is a spun lace nonwoven fabric made of any one of cotton, pulp, rayon, and acetate. The wear article according to claim 1 or 2, wherein the basis weight of the nonwoven fabric of the cellulose fiber is 15-70 g / m 2. The wear article according to claim 1 or 2, wherein the center spacing between adjacent ones of the plurality of perforations is in the range of 1-10 mm. The wear article according to claim 1 or 2, wherein the basis weight of the melt blown nonwoven fabric is 10-30 g / m 2.