JPH06322650A - Laminated sheet and its production - Google Patents

Abstract

PURPOSE:To obtain a laminated sheet, freely formable by thermal press forming and having sufficient compressive strength while keeping the excellence in touch of a cellulosic staple fiber sheet. CONSTITUTION:The laminated sheet is obtained by presubjecting a sheet (A) composed of thermoplastic synthetic resin fiber and a sheet (B) composed of cellulosic staple fiber to the water jet needling treatment, mutually interlacing and joining the sheets, laminating the sheet (B) through the sheet (A) to at least one surface of a film (C) composed of a thermoplastic synthetic resin and joining the sheet (A) to the film (C) through an adhesive or by heat bonding. An eye bandage, a protecting band for wounds, a mammary cup, etc., are readily obtained from the resultant laminated sheet according to the heat press forming and sufficient compressive strength can be provided while keeping the excellence in touch of the cellulosic staple fiber sheet.

Description

Detailed Description of the Invention

[0001]

BACKGROUND OF THE INVENTION 1. Field of the Invention The present invention relates to a laminated sheet formed into an eye patch, a wound protection band, a breast cup and the like and a method for producing the same.

[0002]

2. Description of the Related Art Sheets that have been conventionally used as materials for eye patches, wound protection bands, breast cups, etc. and that are molded by heat include a cellulose-based non-woven sheet alone or a thermoplastic resin for the cellulose-based non-woven sheet. A laminated sheet is known in which spunbond nonwoven sheets made of synthetic resin fibers are entangled or bonded together.

A sheet made of the above-mentioned cellulose-based non-woven sheet alone is made into an eye patch, a wound protection band, a breast cup, etc. by impregnating the sheet with a binder resin and molding and solidifying the sheet. Further, a laminated sheet obtained by entangled or adhering a spunbonded non-woven sheet made of thermoplastic synthetic resin fiber to the cellulose-based non-woven sheet is heated to melt the thermoplastic synthetic resin fiber to form and solidify the ocular patch. , Wound protection bands, breast cups, etc. are made.

[0004]

In the molding with the binder resin, the cellulose-based short fibers are firmly bonded to each other by the resin, and a resin coating is formed on the surface of the cellulose-based short fibers, so that the cellulose-based short fibers are formed. It is not suitable for applications where the original softness is impaired and the softness of the cellulose gauze fiber such as medical gauze is utilized, and an extra step of impregnating a binder resin and drying and solidifying it is required. It is also disadvantageous in terms of sex.

[0005] Although the cellulosic short fiber non-woven sheet and the spunbond non-woven sheet of thermoplastic synthetic resin fiber are entangled or bonded, the good feel of the cellulosic short fiber is utilized, but the heat of the spunbond non-woven sheet is used. Since the thermoplastic synthetic resin fibers are partially heat-sealed to each other by the press molding, the compression strength of the molded product is weakened, and there is a drawback that a product having an extremely complicated shape cannot be molded.

The present invention solves such problems, and provides a laminated sheet which can be formed more freely than heat press molding and has sufficient compressive strength while keeping the soft feel of the cellulose short fibers. The purpose is to do.

[0007]

In order to solve this problem, the present invention relates to a sheet A made of a thermoplastic synthetic resin fiber and a sheet B made of a short cellulosic fiber which are entangled with each other in advance by a water jet needle treatment. And a sheet B is laminated on at least one surface of a film C made of a thermoplastic synthetic resin via the sheet A,
The gist of the present invention is to provide a laminated sheet characterized in that the sheet A and the film C are joined together by an adhesive or heat bonding. Further, the present invention provides that a sheet A made of a thermoplastic synthetic resin fiber and a sheet B made of a cellulosic short fiber are previously entangled and joined to each other by a water jet needle treatment, and at least one surface of a film C made of a thermoplastic synthetic resin is The gist of the present invention is to provide a method for producing a laminated sheet, which comprises stacking a sheet B via a sheet A, and integrating the sheet A and the film C with an adhesive or heat bonding.

The sheet A made of thermoplastic synthetic resin fibers used in the constitution of the present invention is made of short fibers and long fibers made of ordinary thermoplastic synthetic resins such as polyethylene, polypropylene, polyurethane, polyester and polyamide. Padding, random webbing, papermaking,
Alternatively, it is a web formed by the spunbond method.

The sheet B composed of cellulosic short fibers is a web made of cotton, pulp, or rayon short fibers, and formed by carding, random webbing, or papermaking.

The film C made of a thermoplastic synthetic resin is a film made of a thermoplastic synthetic resin such as polyethylene, polypropylene, polyurethane, polyester or polyamide, which has a thickness of 1 .mu.m to 2 mm and is composed of one layer or a plurality of layers. .

The sheet B may be directly formed on the sheet A made of the thermoplastic synthetic resin fiber, or may be laminated on the sheet A after the sheet B is formed. The sheet B made of cellulosic short fibers is entangled with each other by a needle bunch, a water jet needle, a stitch bond or the like in order to join the sheet A made of a thermoplastic synthetic resin fiber. The thickness of the sheet B made of short cellulosic fibers may be arbitrarily selected according to the application, but if the basis weight is less than 30 g / m ² , the sheet A made of the thermoplastic synthetic resin fiber or the film made of the thermoplastic synthetic resin is obtained. C
The sheet B made of short cellulosic fibers cannot be covered sufficiently, and the original softness of the sheet B made of short cellulosic fibers disappears, which is not preferable.

To bond the sheet A made of thermoplastic synthetic resin fiber to the film C made of thermoplastic synthetic resin, the film C made of thermoplastic synthetic resin is coated with an adhesive, and the sheet A is laminated on the film C. Either a wet method of drying and adhesion after drying or a dry method of drying the adhesive and then heat-sealing can be used.However, in the case of the dry method, it has sufficient peel strength to withstand the heat press of the subsequent process. It is necessary to let them do it.

Further, instead of using an adhesive, a film C made of a thermoplastic synthetic resin and a sheet A made of a thermoplastic synthetic resin fiber joined by entanglement with a sheet B made of cellulosic short fibers are laminated while forming a film C made of a thermoplastic synthetic resin. A method, that is, a method of laminating a sheet B made of cellulosic short fibers through a sheet A made of thermoplastic synthetic resin fibers and adhering them before melting the thermoplastic synthetic resin and cooling and solidifying while melting the thermoplastic synthetic resin Can be used. According to this method, it is possible to obtain a laminated sheet that maximizes the feel of the sheet B made of short cellulosic fibers. Further, since the bonding process can be omitted, the process can be rationalized.

Also, as described above, the sheet C made of the thermoplastic short resin is adhered to the film C made of the thermoplastic synthetic resin via the sheet A made of the thermoplastic synthetic resin fiber to form the thermoplastic synthetic resin. Film C
A larger peel strength can be obtained as compared with the case where the sheet is directly adhered to the sheet B made of short cellulosic fibers.

Further, the laminated sheet in which the cellulose-based short fiber sheet B is laminated as described above is heat press-molded to form an eye patch, a wound protection band, a breast cup, etc. of any shape.

[0016]

【Example】

Example 1 A polyester spunbond non-woven sheet having a basis weight of 15 g / m ² and a fineness of 1.2 denier was laminated with a non-woven sheet having a basis weight of 40 g / m ² made of scoured and bleached cotton fibers, to obtain both sides. The woven sheet was entangled with a water jet needle. The spunbond non-woven sheet side of this laminated non-woven sheet was overlaid and adhered to the adhesive surface of a polyethylene film having a thickness of 500 μm with a polyurethane adhesive applied on one side to obtain a laminated sheet.

When this laminated sheet was heat-press molded at 80 ° C. to prepare an eyepatch, an eyepatch having a soft skin side and a protective function on the outer side was obtained.

Comparative Example 1 For comparison with Example 1, a polyethylene spunbond nonwoven sheet having a basis weight of 15 g / m ² and a thickness of 1.2 denier was applied to a scoured and bleached cotton fiber.
Nonwoven sheets of g / m ² were laminated, and both nonwoven sheets were entangled with a water jet needle to prepare a laminated sheet.

When this laminated sheet was heat-press molded at 80 ° C. to prepare an eye patch, the softness on the skin side was the same as in Example 1, but the compressive strength was too small to provide a protective function. could not.

Example ² A non-woven sheet having a basis weight of 100 g / m ² and made of rayon short fibers having a thickness of 2.5 denier and a length of 3 mm was weighted with 8
It is laminated on a polyester spunbond nonwoven sheet having a fineness of g / m ² and a thickness of 1.5 denier and entangled with a water jet needle, and the laminated nonwoven sheet is melted on the polyester spunbond nonwoven sheet. Extruded polypropylene from the slit, thickness 300
A film having a thickness of μm was formed, and the film was cooled and adhered to obtain a laminated sheet.

This laminated sheet was subjected to heat press molding at 120 ° C. to prepare a protective band for scratches. As a result, a protective band having no irritation to the wound and having a sufficient protective function was obtained.

Example 3 A polyester spunbond non-woven sheet having a basis weight of 10 g / m ² and a fineness of 1.2 denier was laminated with a non-woven sheet having a basis weight of 60 g / m ² made of scoured and bleached cotton fibers. , Was entangled with a water jet needle.
The spunbond non-woven sheet side of the laminated non-woven sheet is superposed and adhered on one side of a 200 μm-thick polyester film on which a polyurethane adhesive is applied in dots of 2 mm in diameter at intervals of 3 mm, A laminated sheet was obtained.

When this laminated sheet was heat-pressed at 250 ° C. to form a breast cup, a breast cup having a soft skin side and no irritation to the nipple, etc. and a protective function and a shape-retaining effect on the outside was obtained. It was

Comparative Example 2 For comparison with Example 4, a polyester spunbond non-woven sheet having a basis weight of 10 g / m ² and a thickness of 1.2 denier was applied to a scoured and bleached cotton fiber.
Nonwoven sheets of g / m ² were laminated, and both nonwoven sheets were entangled with a water jet needle to prepare a laminated sheet. When this laminated sheet was impregnated with a polyurethane adhesive emulsion and molded while being dried to form a breast cup, it had an outer protective function and shape retention effect, but it had strong irritation to the skin and nipple. It was too good for practical use.

Example 4 A nylon spunbond non-woven sheet having a unit weight of 10 g / m ² and a thickness of 1.0 denier was laminated with a non-woven sheet having a basis weight of 45 g / m ² made of scoured and bleached cotton fibers. Both non-woven sheets were entangled with a water jet needle. Two sheets of this laminated non-woven sheet were prepared, and a polyurethane adhesive was applied to both sides of the non-woven sheet side of the spunbond non-woven sheet in dots with a diameter of 2 mm at intervals of 3 mm to make a nylon sheet with a thickness of 150 μm. The film was laminated on the adhesive surface of the film and adhered to obtain a laminated sheet.

This laminated sheet was subjected to heat press molding at 210 ° C. to prepare a protective band for scratches. As a result, a protective band having no irritation to the wound and having a soft outer side and having a sufficient protective function was obtained.

[0027]

As described above, according to the present invention, it is possible to obtain a laminated sheet having sufficient compressive strength while maintaining the soft feel of a sheet made of short cellulosic fibers. Further, this laminated sheet can be freely molded by heat press molding, and an eye patch, a protective band for scratches, a breast cup, etc. can be easily obtained.

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Claims (2)

[Claims] 1. A sheet A made of a thermoplastic synthetic resin fiber.
And a sheet B made of short cellulosic fibers are previously entangled with each other by water jet needle treatment, and the sheet B is laminated on at least one surface of a film C made of a thermoplastic synthetic resin with the sheet A interposed therebetween. A laminated sheet, characterized in that the sheet A and the film C are joined by an adhesive or heat bonding. 2. A sheet A made of thermoplastic synthetic resin fiber
And a sheet B made of short cellulosic fibers are previously entangled with each other by a water jet needle treatment, and the sheet B is laminated on at least one surface of a film C made of a thermoplastic synthetic resin via the sheet A. A method for producing a laminated sheet, characterized in that the film C and the film C are integrated by an adhesive or heat bonding.