JPS6019592A - Thermal stencil paper - Google Patents

Abstract

PURPOSE:To prevent a film from adhering by fusing with an original and prevent the clearness of images of a printed matter from being degraded, by laminating a porous base and a polyester film provided on its surface with a layer comprising a metallic salf of a fatty acid as a main constituent. CONSTITUTION:A porous base and a polyester film are laminated on each other by an emulsion or solution of a polyvinyl acetate resin or the like. Separately, a coating liquid is prepared by dissolving a metallic salt of a fatty acid in a solvent such as water, an alcohol and a hydrocarbon in a concentration of 0.5-3% at room temperature or with heating. Then, the coating liquid is applied to the polyester film, and is dried to provide a layer of the metallic salt of the fatty acid on the surface of the film, thereby producing a heat-sensitive stencil paper. Lithium, potassium, sodium or calcium salt or other metallic salt of stearic acid, pulmitic acid or other fatty acid is used as said metallic salt of the fatty acid.

Description

DETAILED DESCRIPTION OF THE INVENTION The present invention relates to a heat-sensitive stencil paper in which a polyester film is laminated to a porous support.

Heat-sensitive stencil paper is known in which a plastic film made of a thermoplastic resin having a thickness of about 2 to 10 microns is laminated to a support such as tengujo paper, synthetic fiber paper, various woven fabrics, or non-woven fabrics. In order to create stencil paper from such base paper, the original is brought into close contact with the film of the original paper and irradiated with light containing infrared rays, and the part of the film that is in contact with the black area of the original absorbs more infrared rays and becomes hotter. Conventionally, it has been adopted to melt or agglomerate only the materials before drilling.

In recent years, it has been proposed to create perforations by heating the base paper with a heat-sensitive element used in thermal printers and facsimiles. Conventionally, vinyl chloride-vinylidene chloride copolymer film has been practically used as the thermoplastic film to be applied to such heat-sensitive stencil paper due to the stretching and wrinkling of the film during printing. .

However, chloride and neal-vinylidene chloride copolymer films begin to shrink at about 60 degrees, causing problems such as curling during storage. It is proposed to use

When using a heat-sensitive stencil paper made of a 2-4 μm polyester film bonded to a porous support, excessive infrared rays are applied when the document is brought into close contact with the stencil film and irradiated with infrared rays to create a stencil. When the film melts, the film and the original are fused together, and when the original is separated from the base paper, the film may be damaged, twisted, and deformed, which can significantly reduce the sharpness of the image quality of printed matter during mimeograph printing.

In addition, when creating a stencil using a heat-sensitive element, the heat-sensitive element and film are fused by melting the film,
In severe cases, the stencil paper may not move, or the image may be misaligned because the movement is not smooth.

An object of the present invention is to provide a heat-sensitive stencil paper which eliminates the drawbacks of the conventional heat-sensitive stencil paper.

That is, by laminating a polyester film to a porous support and further providing a layer containing a fatty acid metal salt as a main component on the film, there is no curling during storage, and it is possible to prevent the film from collapsing with the original during stencil production or with the heat-sensitive element. We have discovered a heat-sensitive stencil paper that does not have any fusion.

As the porous support used in the present invention, tengujo paper, synthetic fiber paper, various woven fabrics, non-woven fabrics, etc. can be used. Furthermore, the porous support and the polyester film are laminated using an emulsion or solution of polyvinyl acetate resin, polyacrylic acid ester resin, or the like.

The polyester film used in the present invention is essentially a polyethylene terephthalate film. In other words, a polyethylene terephthalate film whose main component is polyethylene terephthalate resin made from polyethylene glycol and terephthalic acid is made into a thick sheet by melt extrusion, stretched vertically and horizontally under heating for orientation, and then heat-set at high temperatures. used. The thickness of the polyester film is 4μ in terms of heat-sensitive stenciling properties.
The following is good.

As the fatty acid metal salts used in the present invention, metal salts of fatty acids such as stearic acid, palmitic acid, lauric acid, and oleic acid such as lithium, potassium, sodium, calcium, barium, and aluminum are used.

A method for forming a layer of these fatty acid metal salts on the surface of a polyester film is to add 05 to 6% of the above fatty acid metal salts to a solvent such as water, alcohol, or hydrocarbon at room temperature.
A layer of fatty acid metal salt can be provided on the surface of the polyester film by heating and melting the resin according to the symbol to create a paint, applying it onto a polyester film using a conventional method, and drying it.

Next, the present invention will be specifically explained with reference to Examples.

EXAMPLE A standard heat-sensitive stencil paper was prepared by laminating a 6 μm thick polyester film to 12 g/m 2 Tengucho paper with a vinyl acetate emulsion.

Next, 2 parts by weight of aluminum distearate was mixed with 98 parts by weight of ethanol, and heated and dissolved in SO to prepare a coating solution, which was applied onto the polyester film surface of the standard heat-sensitive stencil paper, dried, and coated. A layer with an amount of approximately 02 g/m2 was formed.

Next, the standard thermal stencil paper obtained as described above and the stencil paper obtained in the example were transferred to a thermal facsimile machine F manufactured by Sanhi Kaiki Co., Ltd.
It was stenciled with A-80 and printed with an ordinary rotary mimeograph machine for comparative evaluation.

As a result, when using standard heat-sensitive stencil paper with a heat-resistant release layer, the heat-sensitive element and the film of the base paper fused together during punching with a heat-sensitive facsimile machine, and the feed of the base paper stopped midway through, making it impossible to make a plate. On the other hand, all of the stencil sheets of Examples of the present invention ran smoothly after facsimile, and good printed matter could be obtained.

Procedural amendment September 16, 1981 Kazuo Jewakasugi, Commissioner of the Japan Patent Office 1 Indication of the case 1988 Patent application No. 126235 Heat-sensitive stencil paper 3 Name of person making the amendment General Co., Ltd. (name) 4 Agent 5 , Subject of amendment (1) “Detailed description of the invention” in the specification
Column (1) "60°" on page 2, line 12 of the specification is corrected to [60'CJ.

Claims (1)

[Claims] 1. A heat-sensitive stencil paper comprising a porous support and a polyester film laminated together, characterized in that a layer containing a fatty acid metal salt as a main component is provided on the surface of the film.