JPH0761159A - Manufacture of thermal stencil paper - Google Patents

Abstract

PURPOSE:To improve laminating operability and sensitivity by bringing a porous support coated with adhesive into pressure contact with a winding surface of a rolled heat punchable film to be adhered when a thermal stencil paper is manufactured by adhering the support to the film. CONSTITUTION:A thermal stencil paper is manufactured by adhering a porous support to a heat punchable film. In this case, the adherence is executed by bringing the support coated with adhesive into pressure contact with a winding surface of the rolled heat punchable film. Further, the film may be formed in a rolled state by previously coating it with a stick preventive layer. In addition, after the adherence, the surface of the film may be coated with stick preventing agent. For example, the sheet C is manufactured by adhering Manila paper A coated with adhesive by a gravure coater 1 to a winding surface B of a rolled heat punchable polyester film in-line coated with stick preventive agent at the time of forming the film, and then drying it by a dryer 3.

Description

Detailed Description of the Invention

[0001]

BACKGROUND OF THE INVENTION 1. Field of the Invention The present invention relates to a heat-sensitive stencil sheet, and more particularly to a heat-sensitive stencil sheet for plate making with a thermal head.

[0002]

2. Description of the Related Art A heat-sensitive stencil sheet is generally composed of a base paper obtained by laminating an ink-permeable porous support and a heat-melting perforating film directly or via an adhesive. A plate is made by thermally perforating the letters, figures, etc., and printing is performed using this plate. As this plate making method, a digital plate making method using a thermal head and a method of irradiating infrared rays or xenon flash light are already known. In particular, the digital plate making method using a thermal head has advantages such as low printing cost when printing a large number of sheets and high-speed printing, as compared with electrostatic copying (PPC), and it is rapidly used in offices and schools. Is popular in

[0003]

In recent years, there has been a demand for higher sensitivity of heat-sensitive stencil base paper due to speeding up of plate making and the like. However, when laminated by the conventional method, the film is affected by the smoothness of Japanese paper and the film surface smoothness becomes low,
On the other hand, there is a problem that the sensitivity becomes poor and, on the other hand, when a thin film is used for high sensitivity, workability at the time of lamination becomes poor and wrinkles occur. The present invention provides a heat-sensitive stencil sheet having good laminating workability and high sensitivity.

[0004]

Means for Solving the Problems The present invention for achieving the above-mentioned object is a method for producing a heat-sensitive stencil sheet by adhering a porous support and a heat-penetrable film, wherein the adhesion is an adhesive. It is carried out by bringing the coated porous support into pressure contact with the winding surface of the roll-shaped heat-penetrable film.

The roll-shaped heat-piercing film used for producing the heat-sensitive stencil sheet of the present invention includes a polyvinyl chloride film, a vinyl chloride-vinylidene chloride copolymer film, a polyester film, a polyolefin film such as polyethylene and polypropylene. Any film having a thickness of 6.0 μm or less such as a polystyrene film can be used and is not particularly limited. A stretched polyester film is commonly used as a film for heat-sensitive stencil sheet. The polyethylene terephthalate film has high crystallinity (crystallinity) and low sensitivity,
A 2.5 μm thick one is used. The film that can be preferably used in the present invention is a high-sensitivity film having a thickness of 0.5 to 6.0 μm, such as a copolyester film having low melting energy, high heat shrinkage, and low crystallinity. These films have, for example, a melting energy of 3 to 11 ca.
The difference between the melting end temperature and the melting start temperature at 1 / g is 50 to 1
Copolyester film having a temperature of 00 ° C.
-149496), the heat shrinkage at 140 ° C is 15% or more and 80% or less, and the heat shrinkage stress at 120 ° C is 150 to 5%.
A copolymerized polyester film of 00 g / mm ² (JP-A-63-160895), a film characterized in that two melting peaks are observed (JP-A-3-39294),
100 at a heat shrinkage of 100 ° C between 15% and 80%
A copolymerized polyester film having a heat shrinkage stress at 75 ° C. of 75 to 500 g / mm ² (Japanese Patent Laid-Open No. 62-282983) can be exemplified. Such a roll-shaped heat-sensitive perforable film can be preferably used.

[0006] The porous support may be a porous support that does not substantially have perforation when heated and allows ink to pass through during printing. For example, Manila hemp, kozo, mitsumata, natural fibers such as pulp, and polyester. , Vinylon, nylon,
Examples thereof include synthetic fibers such as rayon, and these may be used alone or in combination of two or more kinds, wet or dry papermaking, screen printing gauze such as polyester, nylon and the like.

The adhesive used in the present invention may be any adhesive as long as it can adhere the roll-shaped heat-penetrable film and the porous support to each other, such as vinyl acetate type, acrylic type, vinyl chloride vinyl acetate copolymer type and polyester type. , Urethane type, polyamide type emulsion type, solvent type, solventless type, hot melt type, ultraviolet ray curing type, electron beam curing type and the like. Further, other additives such as antistatic agents and lubricants may be added to these, if necessary.

Examples of the anti-sticking agent include surfactants, silicone-based agents, and fluorine-based agents having a releasing property. Further, other additives such as antistatic agents and lubricants may be added to these, if necessary. The anti-sticking agent may be coated on the film before laminating or may be coated on the film surface after laminating.

In the method of the present invention having the above-mentioned constitution, the porous support is coated with an adhesive by a method such as a gravure roll, and pressed onto the roll-shaped film surface as soon as possible to bond on the roll-shaped film surface. is necessary. At this time, it is more effective to increase the initial adhesive force with warm air, ultraviolet rays, an electron beam, a cooling roll or the like immediately after contacting the porous support having the roll-shaped film surface coated with an adhesive.

[0010]

In the method of the present invention, the porous support is coated with an adhesive, and the porous support is attached to the roll-shaped heat-penetrable film by press-contacting the wound surface of the film. It is possible to obtain a heat-sensitive stencil sheet having a smoothness higher than that of the heat-sensitive stencil sheet prepared by the conventional manufacturing method, the adhesion to the thermal head is improved, and the thermal conductivity is improved, so that the heat-sensitive stencil sheet having high sensitivity can be manufactured.

Hereinafter, the present invention will be described in more detail with reference to examples. [Example 1] Manila hemp paper (A) having a basis weight of 11.5 g / m ² and a thickness of 45 µm, which was obtained by coating a vinyl chloride-vinyl acetate copolymer adhesive with a gravure roll at 1.0 g / m ² ; Winding surface (B) of a roll-shaped heat-penetrable polyester film having a heat shrinkage ratio of 100% at 32 ° C and a width of 44% and a thickness of 1.5μ, which was coated in-line with a silicone emulsion-based stick inhibitor during film formation. Immediately after adhering to and adhering to, heat-sensitive stencil sheet (C) was obtained by drying with warm air at 50 ° C. The process of Example 1 can be performed by the apparatus schematically shown in FIG.

[Example 2] Manila hemp thin paper (A) having a basis weight of 11.5 g / m ^{2 and a} thickness of 45 µ, which was obtained by coating a vinyl chloride-vinyl acetate copolymer adhesive with a gravure roll at 1.0 g / m ^2. The heat shrinkage ratio at 100 ° C is 32
%, 44% in width, and 1.5 μm in thickness and having a thickness of 1.5 μ
Immediately, dry with warm air at 50 ° C, and further add 0.05 g / m of silicone-acrylic graft copolymer resin on the film surface.
^The heat-sensitive stencil sheet (C) was obtained by coating and drying so as to have an adhesion amount of ² . The process of Example 2 can be performed by the apparatus schematically shown in FIG.

[Comparative Example 1] A vinyl chloride-vinyl acetate copolymer adhesive was coated with a gravure roll at a non-volatile content of 1.0 g / m ² at 100 ° C. to obtain a thermal shrinkage of 32% in length and 44 in width. % Of the heat-penetrable polyester film (B) having a basis weight of 11.5 g / m ^{2 and a} thickness of 4
After pressing and drying with 5 μm Manila hemp paper (A), silicone acrylic graft copolymer resin was applied on the heat-penetrable polyester film so as to have an adhesion amount of 0.05 g / m 2, dried and heat-sensitive. A stencil sheet (C) was obtained. The process of Comparative Example 1 can be performed by the apparatus schematically shown in FIG.

[Comparative Example 2] A heat-sensitive stencil sheet (C) was obtained in the same manner as in Comparative Example 1 except that an adhesive was coated on the Manila hemp medicine paper side. The process of Comparative Example 2 can be performed by the apparatus schematically shown in FIG.

The heat-sensitive stencil sheets of Examples 1 and 2 and Comparative Examples 1 and 2 were used as Preport VT-350 manufactured by Ricoh Company.
A thermal head of No. 0 was used for plate making, and printing was performed with a preport VT-3500 manufactured by Ricoh Co., Ltd., and evaluated. The obtained results are as shown in Table 1.

[Table 1] ○: Good △: No problem in practical use ×: Problem in practical use

[0016]

According to the production method of the present invention, a heat-sensitive stencil sheet having good laminating workability and no wrinkles can be produced. Further, even with the same heat-penetrable film, the film surface smoothness was increased, and a high-sensitivity heat-sensitive stencil sheet was obtained, and the printed matter obtained using it was clear. Further, compared with the conventional heat-sensitive stencil sheet, there is an effect that the sensitivity can be increased and the plate-making speed can be increased.

[Brief description of drawings]

FIG. 1 is a schematic view of an apparatus for performing the process of Example 1.

FIG. 2 is a schematic view of an apparatus for performing the process of Example 2.

3 is a schematic view of an apparatus for performing the process of Comparative Example 1. FIG.

FIG. 4 is a schematic diagram of an apparatus for performing the process of Comparative Example 2.

[Explanation of symbols]

 1 Gravure coater 2 Wire bar coater 3 Dryer 4 Dryer A Porous support B Heat-penetrable film C Heat-sensitive stencil base paper

Claims (4)

[Claims] 1. A method for producing a heat-sensitive stencil sheet by adhering a porous support and a heat-penetrable film, wherein the adhesion comprises winding an adhesive-coated porous support with a roll-shaped heat-penetrable film. A method characterized in that the method is carried out by press-contacting the surface. 2. The method according to claim 1, wherein the heat-penetrable film is a roll-shaped heat-penetrable film which is precoated with an antistick layer. 3. The method according to claim 1, wherein after sticking the porous support and the heat-penetrable film, an antistick agent is further coated on the surface of the heat-penetrable film. 4. A heat-sensitive stencil sheet produced by the method according to any one of claims 1 to 3.