JPS58147396A - Heat-sensitive stencil paper and production of the same - Google Patents

Abstract

PURPOSE:To obtain the titled stencil paper capable of making uniform the size of perforations produced by a heat-sensitive stencil-forming operation, enhancing the perforation area ratio and enhancing the resolution and clearness of a printed material, by laminating a porous tissue paper and a synthetic resin film on each other with a multiple net form adhesive layer provided therebetween. CONSTITUTION:An adhesive liquid 21 is applied to a coating roller 22, an excess of the adhesive liquid is scraped off the roller 22 by a doctor 23, the porous tissue paper 24 is sequentially let out, and is sequentially pressed against the roller 22 at a predetermined pressure by a press roller 25 to form the net form adhesive layer 26 on the paper 24. Then, the adhesive layer 26 is incompletely dried by a drier 12, the synthetic resin film 27 is let out and is laminated on the paper 24 on the adhesive layer 26 side, and the resultant laminate is passed through a pair of press rollers 28, 29 to adhere the paper 24 and the film 27 to each other as one body, followed by drying by a drier 30 to produce the heat- sensitive stencil paper 31. Since the adhesive is applied to one side of the porous tissue paper in a small thickness, the adhesive is deposited only on the fibers at the surface of the tissue paper to form the net form adhesive layer.

Description

[Detailed Description of the Invention] This invention relates to a heat-sensitive stencil printing base paper formed by integrally polymerizing with an adhesive, and a method for producing the same. By making the size of the perforations uniform and further increasing the perforation area ratio (perforated area/non-perforated area), the resolution of printed matter,
The purpose is to improve the clear IW and to maintain printing durability to the same level as conventional products even with a small amount of adhesive.

Conventional methods for producing base paper for heat-sensitive stencil printing are as shown in Figure 1.
As shown in FIG. 2, the adhesive liquid 1 is applied to the entire surface of the coating roller 2, the excess adhesive liquid is scraped off with a doctor 8, the synthetic resin film 4 is sequentially unwound, and the pressure roller 5 is applied to the coating roller 2 with a predetermined pressure. to form an adhesive layer 6 on the entire surface, and then unroll the porous thin paper 7, polymerize it on top of it, and insert it between a pair of pressure rollers 8 and 9 to stick it together. Dry with dryer IO to make heat-sensitive stencil printing base paper 1
Methods for producing l are known.

By the way, when holes are formed by heat-sensitivity, the perforations can be made more neatly without adhesive, but since the heat-sensitive stencil printing base paper formed by the above-mentioned conventional manufacturing method has an adhesive layer formed on the entire surface with a constant thickness. It had the disadvantage that it did not perforate cleanly, had a resolution of less than 4 lines per simple, and had a sharpness that could only make it easy to read 6-point type, and it was not possible to improve its performance any further.

The present invention is a heat-sensitive stencil printing base paper in which a porous tissue paper and a synthetic resin film are polymerized to form a large number of network adhesive layers between them, and a method for manufacturing the same, which eliminates the drawbacks of the conventional paper. be.

FIG. 8 shows an embodiment of an apparatus for producing a heat-sensitive stencil printing base paper according to the present invention.

The adhesive liquid 21 is applied to the application roller 22, the excess adhesive liquid is scraped off with a doctor 28, and the porous thin paper 24 is sequentially unwound and pressed against the application roller 22 with a predetermined pressure using the suppression roller 25 to coat the surface thereof. A network adhesive layer z6 is formed. Next, it is semi-dried in the dryer 12, and a synthetic resin film 27 is unwound and polymerized thereon, and a pair of pressure rollers 2
It is inserted between 8 and 29 and attached together, and dried in a drier 80 to produce a heat-sensitive stencil printing base paper 81.

That is, in the present invention, since the adhesive is applied thinly to one surface of the porous tissue paper, the adhesive is applied only to the fibers on the surface of the porous tissue paper, forming a network adhesive layer, so that a small amount of adhesive is applied. A base paper for heat-sensitive stencil printing is obtained in which a synthetic resin film and a porous thin paper are bonded together with the adhesive described above.

Further, if the dryer 12 is provided, it has the effect of promoting volatilization of the solvent of the adhesive, causing microclosing, and promoting adhesion of the adhesive to the fibers near the surface of the porous thin paper.

In order to actively form a network adhesive layer on the fibers on the surface of the porous thin paper, it is also possible to use a porous thin paper impregnated with a solvent that dissolves the adhesive component of the adhesive.

Example 1 A film with a thickness of 7.5μ made of vinylidene chloride copolymer and porous tissue paper with a basis weight of 8.5g/rrL were attached by a spinning method using a vinyl acetate adhesive whose resin content was adjusted to 17g. A heat-sensitive stencil printing base paper was produced using the same method.

Example 2 A film made of polyester with a thickness of 5.0 μm and a porous thin paper impregnated with methanol having a weight of 8.5 y/m were prepared using the above method using a vinyl acetate adhesive with a resin content adjusted to 15%. A heat-sensitive stencil printing base paper was produced by pasting the base paper.

The resolution and sharpness of the base papers of Example 1.2 and Comparative Examples manufactured by the conventional method when subjected to thermal plate making and 50°C, 8
When the forced heat resistance strength was compared at 5%, the following results were obtained.

In addition, the resolution and sharpness are based on the Electrophotography Society Test Chart N.
Using 0I-R19?5 as the original, light intensity 2Cα
Thermal platemaking was carried out at l/cd, and printing was carried out using a commercially available rotary press using high-quality paper as printing paper, and the 100th printed sheet was visually observed.

Comparison table' Names of the method of the present invention, resolution, and comparison with the conventional method.
The clarity was excellent, and even with a small amount of adhesive, it was possible to obtain the same stiffness as the conventional method.

[Brief explanation of drawings]

Figure 1 is a schematic explanatory diagram of an apparatus for carrying out the conventional method, and Figure 2'
The figure is an enlarged partial front cross-sectional view of a heat-sensitive stencil and printing base paper manufactured by the apparatus shown in FIG. 1, FIG. FIG. 2 is an enlarged partial front cross-sectional view of the manufactured heat-sensitive stencil printing base paper. 24... Porous tissue paper, 26... Network adhesive layer, 2
7...Synthetic resin film, 81...Thermosensitive stencil printing base paper.

Claims (1)

[Claims] ■ A heat-sensitive stencil printing base paper made by polymerizing a porous thin paper and a synthetic resin film to form a large number of reticular adhesive layers therebetween. ■ A method for producing a heat-sensitive stencil printing base paper, which is characterized by attaching an adhesive to the fiber layer on one surface of porous thin paper, and polymerizing a synthetic resin film on the fiber layer to form a reticulated adhesive layer.