JP2971417B2 - Surface sheet for sanitary goods - Google Patents

Description

DETAILED DESCRIPTION OF THE INVENTION

[0001]

BACKGROUND OF THE INVENTION 1. Field of the Invention The present invention relates to a surface sheet for sanitary articles, and more particularly, to the surface of a sanitary article such as a sanitary napkin or a disposable diaper, which is brought into contact with a wearer's skin when the article is worn. Regarding the sheet.

[0002]

2. Description of the Related Art Conventionally, in Japanese Patent Publication No. 57-17081,
As a top sheet of a sanitary article, a plastic sheet in which tapered capillaries are formed at predetermined intervals on a plastic film is known. However, since the surface sheet is made of a plastic film, the surface sheet exhibits film gloss and gives the skin a film feel. In addition, there is a problem that it adheres tightly to the skin to give a so-called stickiness, and that air permeability between the skin and the surface sheet and skin respiration are hindered.

In Japanese Patent Application Laid-Open No. 55-14638, in order to reduce the above-mentioned problem, a fibrous appearance can be imparted to the upper surface by a method such as making the upper surface of the topsheet uneven, and making the opening pattern irregular. It has been disclosed.

[0004]

[Problems to be Solved by the Invention]
38 is disclosed in Japanese Patent Publication No. 57-1708 in that it is made only of a plastic film.
It is essentially the same as the topsheet of No. 1, and there is a limit in giving a fibrous appearance. Although this topsheet may have been somewhat successful in eliminating film gloss, it does not give the skin a film feel,
The so-called stickiness, breathability, skin respiration and other problems have not yet been sufficiently solved.

An object of the present invention is to solve the above-mentioned problem by welding a fiber layer which is in contact with the skin on the upper surface of a thermoplastic film layer in which openings for transmitting body fluids are arranged at predetermined intervals to form a composite. The main object is to provide a topsheet that can be used.

[0006]

SUMMARY OF THE INVENTION The present invention relates to a surface sheet for sanitary articles, wherein the sheet substrate comprises a thermoplastic film layer and a fiber layer containing thermoplastic fibers melt-bonded to the upper surface of the film layer. An area where the film layer and the fiber layer are melt-bonded in the top sheet for sanitary articles in which openings are arranged at predetermined intervals in the film layer.
Is 30% or more of the surface of both layers, and the joint strength is
The sheet substrate has a width of 25 g or more and 5 g or more, and a capillary extending continuously downward from the lower surface of the film layer is formed on a periphery of the opening, and a lower end opening of the capillary and its lower end are formed.
It has a plurality of wrinkles extending substantially in the tube axis direction in the vicinity .

The present invention is characterized in that the capillary extends from its proximal end to its distal end so as to have a gradually decreasing diameter, that the capillary extends from its proximal end to its distal end with the same diameter, The structure includes a point extending from the base end to the distal end so as to gradually increase in diameter, and a point where the film layer and the fiber layer have hydrophilicity.

[0008]

The topsheet having the above structure is used to form the surface of a sanitary article having a liquid-absorbent core inside. In this use state, the body fluid penetrates each opening and is absorbed inside the sanitary article. The fibrous layer abuts on the wearer's skin without adhering to the skin and gives the feel of the fibrous cloth, and the ventilation between the skin and the topsheet does not hinder skin breathing. The film layer exerts a function of preventing the body fluid absorbed by the absorbent core from flowing back to the fiber layer.

[0009]

DESCRIPTION OF THE PREFERRED EMBODIMENTS Embodiments of the topsheet according to the present invention will be described below with reference to the drawings.

FIG. 1 is a plan view of a topsheet 1, and FIG.
FIG. 2 is a partially enlarged cross-sectional view of the topsheet 1 of FIG. 1. The base material of the topsheet 1 includes a thermoplastic film layer 2 and a fiber layer 3 containing thermoplastic fibers. The openings 4 are arranged at predetermined intervals in the film layer 2, and capillaries 5 extending downward from the lower surface of the film layer 2 are formed continuously around the periphery of the openings 4. The capillary 5 has a taper whose diameter gradually decreases from the opening 4 to the lower end opening 7.

FIG. 3 shows another embodiment of the topsheet 1.
FIG. 3 is a sectional view corresponding to FIG. 2. The capillary 5 has substantially the same diameter from the opening 4 to the lower end opening 7.

FIG. 4 is a sectional view showing still another embodiment of the topsheet and corresponding to FIG. The capillary 5 has an opening 4
From the lower end opening 7 to a taper whose diameter gradually increases.

The thickness of the peripheral wall 6 of the film layer 2 forming the capillary 5 is smaller than the thickness of each of the rib film layer 2 and the fiber layer 3 which are non-opening portions of the topsheet 1. . Further, the peripheral wall 6 of the film layer 2 forming the capillary tube 5 in FIG. 4 is gradually thinned toward the lower end opening 7 and, at the lower end opening 7 and the vicinity thereof, there are several sections extending substantially in the tube axis direction. Has wrinkles.

The total occupation ratio of the openings 4 is 30 to 70% of the film layer 2, the diameter is 0.2 to 2 mm, the length (height) is 0.50 to 5 mm, and the width of the rib between the openings is 0. 5-
It is preferably 2.5 mm.

The material of the thermoplastic film layer 2 is most preferably a polyolefin-based synthetic resin such as polyethylene or polypropylene, but other synthetic resins such as polyester, nylon and EVA can also be used. The thickness of the film layer is generally 7-30 μm.
It is. The material of the film layer has a slight amount, for example, 0.50 to 0.55 to make the wetting property larger than that of the fiber layer 3.
1% by weight of a hydrophilicity-imparting agent may be contained. As the hydrophilicity-imparting agent, polyethylene glycol or the like as a hydrophilic surfactant, CMC, PVA, or the like can be used. The orientation of the fibers in the fiber layer 3 is not particularly limited, and the orientation may be parallel, random, or a mixture thereof. However, if 30% or more of the fibers are oriented in the length direction of the topsheet 1, in other words, in the length direction of the sanitary article to which the topsheet is applied,
The tendency of body fluids to flow and diffuse in the same direction is enhanced.

The material of the fiber layer 3 contains at least 10% by weight, preferably at least 40% by weight of thermoplastic fibers. As the thermoplastic fiber, a polyolefin-based synthetic resin such as polyethylene and polypropylene is most preferable.
In order to form the fiber layer and join the film layer 2, heat fusion is performed to the film layer 2 while forming the meltblown fiber, or a web previously formed of the meltblown fiber is thermally fused to the film layer, Any one of a bonded nonwoven fabric, a melt bonded nonwoven fabric, and a needling nonwoven fabric is thermally fused. Depending on the mode of the fiber layer, hydrophilic fibers such as rayon, acetate, cotton, etc. may be added in an appropriate amount to give a feeling of moistening to the skin or not to wet the skin much, for example, 4
0% by weight or less may be contained. The basis weight of the fiber layer is 3 ~
Preferably, the fiber diameter is 30 g / m ² , and the fiber diameter is as small as possible. However, considering that plural kinds of fibers may be mixed, the fiber diameter is 0.1 to 100 μm, and particularly, the thermoplastic fiber diameter is 0.1 μm. It is preferably 1 to 40 μm.

[0017] The area where the film layer 2 and the fibrous layer 3 is melted bonding be more than 30% of their both layers surfaces, the bonding strength at 25mm width of the sheet substrate consisting both layer 5g
It is preferred Ru der more. When the bonding area is less than 30%, not only the bonding strength is reduced and there is a risk of delamination, but also the porosity between the two layers is increased and the body fluid stays in the voids, thereby reducing the fluid diffusibility. Will be.

[0018]

The topsheet according to the present invention is composed of a sheet base material in which a fiber layer, which is an extra-fine fibrous nonwoven fabric, is melt-bonded on the upper surface of the film layer. When the surface of a sanitary article such as a sanitary napkin or disposable diaper having a liquid core is formed, compared to the above-described conventional surface sheet in which the film layer directly abuts on the skin, the fiber fabric feel is excellent. Needless to say, there is little contact surface with the skin, and air permeability between the skin and the surface sheet and skin respiration can be sufficiently obtained. As a result, so-called stickiness or moist feeling is not given to the skin, and the cause of the skin disease can be prevented.

Further, since it has a capillary tube, fluid guidance effectively from the surface sheet to the article inside, keep the the to body fluids staying in the fiber layer to minimize fiber layer is always in a dry state be able to. Especially the bottom opening of the capillary and its opening
Has a plurality of wrinkles extending substantially in the tube axis direction
The wrinkles enhance the capillary action, so that
Before the bottom opening of the capillary touches the capillary by capillary action
It can be moved inside the article.

Area where the film layer and the fiber layer are melt-bonded
Is 30% or more of the surface of both layers, and the joint strength is
5g or more at 25mm width of sheet base material consisting of both layers
Therefore, there is no risk of delamination during use.
A void is formed between the body fluids and the body fluid stays in the
There is no decrease in dynamic diffusion.

[Brief description of the drawings]

FIG. 1 is a plan view of a topsheet from which a part of a fiber layer has been peeled off.

FIG. 2 is a partially enlarged sectional view of FIG.

FIG. 3 is a sectional view showing another embodiment and corresponding to FIG. 2;

FIG. 4 is a cross-sectional view showing still another embodiment and corresponding to FIG. 2;

[Explanation of symbols]

 DESCRIPTION OF SYMBOLS 1 Surface sheet 2 Film layer 3 Fiber layer 4 Opening 5 Capillary tube

──────────────────────────────────────────────────続 き Continuation of the front page (56) References JP-A-56-169801 (JP, A) JP-A-60-259261 (JP, A) JP-A-1-72745 (JP, A) JP-A 57-169 17081 (JP, A) Japanese Utility Model 1-59121 (JP, U) (58) Field surveyed (Int. Cl. ⁶ , DB name) B32B 1/00-35/00 A61F 13/15

Claims (6)

(57) [Claims] 1. A sheet substrate comprising a thermoplastic film layer and a fiber layer containing thermoplastic fibers melt-bonded to the upper surface of the film layer, wherein openings are arranged at predetermined intervals in the film layer. In the topsheet for sanitary articles, the area where the film layer and the fiber layer are melt-bonded is
30% or more of the surfaces of both layers, and the bonding strength is
5 g or more in a width of 25 mm of the sheet base material, a capillary extending continuously downward from the lower surface of the film layer is formed on the periphery of the opening, and the lower end opening of the capillary and its vicinity
Wherein said topsheet has a plurality of wrinkles extending substantially in the tube axis direction . 2. The topsheet according to claim 1, wherein said capillary extends from its proximal end to its distal end so as to become gradually smaller in diameter. 3. The topsheet according to claim 1, wherein the capillary extends from its base end to its tip with the same diameter. 4. The topsheet according to claim 1, wherein the capillary extends from its proximal end to its distal end so as to gradually increase in diameter. 5. The surface sheet according to claim 1, wherein the film layer has a hydrophilic property. 6. The fiber layer according to claim 1, wherein said fiber layer has a hydrophilic property.
Surface sheet according to 1.