JPH03132394A - Original plate for thermal screen printing plate - Google Patents

Abstract

PURPOSE:To facilitate the printing of a word processor by forming the original plate for a thermal screen printing plate by bonding an ink impervious sheet to the frame part of the flexible reinforcing base material provided to the other single surface of the porous sheet of the base paper for the thermal screen printing plate. CONSTITUTION:A adhesive layer 2 is provided to the single surface of a porous sheet 1 and a thermoplastic resin film layer 3 and, if necessary, a sticking layer 4 are successively provided thereon to obtain base paper for a thermal screen printing plate. A frame part B (obtained by cutting off the printing corresponding region 5 of a flexible reinforcing base material) is bonded to the exposed surface of the porous sheet of the base paper A for the thermal screen printing plate formed by cutting the base paper thus obtained for the thermal screen printing plate. Further, an ink impervious sheet C is superposed on the frame part B by an adhesive 6 to be bonded thereto to form the original plate for the thermal screen printing plate. The surface roughness Ra of the surface in contact with the flexible reinforcing base material of the ink impervious sheet is set to 0.5mum.

Description

Detailed Description of the Invention <Industrial Application Field> The present invention enables direct printing by a printer using a thermal head such as a word processor, and can be used to print a simple printing machine (typified by a hobby printing machine). For example, the present invention relates to a heat-sensitive stencil original plate that can be attached to a printout manufactured by Riso Kagaku Kogyo Co., Ltd. (hereinafter referred to as a simple printing machine) and capable of printing about several hundred sheets.

<Prior Art> Recently, simple printing of about 100 sheets, such as New Year's cards, has been carried out using heat-sensitive stencil paper made of a combination of a porous sheet and a thermoplastic resin film. The following method was used to prepare the original version in this case. In other words, you can print out the edited version from a word processor, and then use it directly as the original, or you can use PPC to reprint the edited version as a manuscript, and then place a heat-sensitive stencil paper on top of the original. Then, the original plate was created by flash plate making using a bulb flash or the like.

Another simple printing method is to directly print out postcards one by one using a word processor.

However, all such methods have the problem of being troublesome, time-consuming, and expensive.

In response to this, the present inventors have previously proposed an original plate that can be directly printed by a printer using a thermal head such as a word processor.

The outline of this method is to paste a flexible reinforcing base material from which the printing area can be cut out on the exposed surface of a porous sheet constituting the base paper for thermal stencil printing, and then ink ink on at least one side of the periphery of the reinforcing paper. An impermeable sheet is attached, and printing can be performed simply by cutting out the portion of the flexible reinforcing base material that is to be printed.

However, when adhering the ink-permeable sheet and the flexible reinforcing base material, if two or more sides of the flexible reinforcing base material are glued together, when the original is rotated in half in a word processor, the inner diameter Due to the difference in curvature between the outer diameter and the outer diameter, wrinkles tend to occur and it is difficult to pass through. Furthermore, if the adhesion is applied to only one side in the direction perpendicular to the running direction of the original, slipping may occur between the ink-impermeable sheet and the flexible reinforcing base material during running during plate making in a word processor. As a result, the plate-making surface may become distorted or paper jams may occur, making it impossible to run.

These failures not only result in the original being wasted, but also can cause serious problems such as damage to the thermal head.

Means for Solving the Problem> As a result of research on this point, the present inventor has determined that the surface roughness of at least the surface in contact with the flexible reinforcing base material of the ink-impermeable sheet constituting the thermal stencil original plate has been improved. Center line average roughness (JIS B 060] Definition and display of surface roughness) of 0.
By having a friction coefficient of 5 μm or more and a friction coefficient of 0.25 or more for the contact surface of the flexible reinforcing base material, it prevents slipping between the ink-impermeable sheet and the reinforcing paper during printing when applied to a word processor. I found out what I can do.

The present invention provides a porous sheet for heat-sensitive stencil printing, in which at least an adhesive layer and a thermoplastic resin film layer are sequentially provided on one side of the porous sheet. In a heat-sensitive stencil original plate formed by adhering a frame portion of a provided flexible reinforcing base material and adhering an ink-impermeable sheet to the frame portion of the reinforcing base material, at least the flexible ink-impermeable sheet Center line average roughness of the surface in contact with the base material for reinforcement (JIS80601
Definition and indication of surface roughness) is 0°5 μm or more, and the coefficient of friction with respect to the surface in contact with the flexible reinforcing base material is 0.25.
This is a heat-sensitive stencil original plate characterized by the above.

The specific outline of the thermal stencil original plate of the present invention is as follows.

A flexible heat-sensitive stencil base paper in which at least an adhesive layer and a thermoplastic resin film layer are sequentially provided on one side of the porous sheet, and cuts are provided on the other side of the porous sheet to cut out the printing area. This is a heat-sensitive stencil original plate formed by adhering a frame portion of a reinforcing base material and adhering an ink-impermeable sheet to the frame portion of the flexible reinforcing base material. In this case, the exposed surface of the thermoplastic resin film layer constituting the present invention may be provided with mold releasability such as fluororesin or silicone resin, or
Alternatively, an anti-stick layer may be provided on the exposed surface.

Next, as a base material for flexible reinforcement, the thickness is 50 to 600 μm.
, stiffness 3-150g1cm (However, JIS P
8125 Paperboard Stiffness Test Method by Overload Bending Method), plastic film, plastic foam sheet, etc. are used.

As the porous sheet of the heat-sensitive stencil paper used here, paper, non-woven fabric, or woven fabric made mainly from natural fibers such as mitsumata, kozo, Manila hemp, and synthetic fibers such as rayon, polyvinyl alcohol, and polyester are used. .

As the adhesive layer, appropriate materials such as polyester resin, polyvinyl acetate resin, polyvinyl chloride resin, polyacrylic resin, etc., can be used.

Examples of the thermoplastic resin film layer include the following.

Homopolymers, copolymers, and blends of polyvinyl chloride, polyvinylidene chloride, polyvinyl acetate, polyvinyl acetal, polystyrene, polycarbonate, polyester, polyamide cellulose acetate, ethyl cellulose, acrylic resin, fluororesin, silicone resin, etc.

The ink-impermeable sheet has a centerline average roughness (hereinafter abbreviated as Ra) of the surface roughness of at least the surface in contact with the flexible reinforcing base material.
is 0.5 μm or more, and the friction coefficient with respect to the contact surface of the reinforcing base material is 0.25 or more.

Examples include surface-treated film sheets of polyester, fluororesin, silicone resin, vinylidene chloride resin, etc., paper, processed paper, metal foil, woven fabric, and the like.

Surface treatment methods include matte treatment, embossing, pigment coating, rubber coating, and the like, and it is possible to obtain the desired center line average roughness and friction coefficient.

This will be explained below with reference to the drawings. FIG. 1 shows a cross section of a conventional heat-sensitive stencil paper, in which a porous sheet 1 is provided with an adhesive layer 2 on one side, a thermoplastic resin film layer 3, and a stick layer 4, if necessary, in this order.

FIG. 2 is a structural diagram of the thermal stencil original plate of the present invention, in which a frame is formed on the exposed surface of a porous sheet of thermal stencil atoms A obtained by cutting the thermal stencil atoms shown in FIG. 1 into a predetermined size. B (the printed area 5 of the flexible reinforcing base material is cut out) is adhered, and an ink-impermeable sheet (C) is adhered to overlap B in the frame at the adhesive part 6.

To specifically explain the steps of plate making and printing using the original plate of the present invention, first, printing is performed using a word processor, and then the printing area of the flexible reinforcing base material is cut and removed from the cut, and then ink is applied. and then run it on a simple printing machine,
If you print, you can easily and clearly print about 100 sheets. Note that the cuts in the flexible reinforcing base material may all be made with the same perforations, but the efficiency of the removal work in the printing area may be improved by making large cutting lines at some corners or complete cutting lines at the negative sides. can be increased.

<Example> Examples will be described below.

Example 1 A polyester film with a thickness of 1.8 μm (Tijin Tetron Film F manufactured by Teijin Co., Ltd.) was used as a thermoplastic resin film layer.
D 1.8 μm), and a saturated polyester resin (Toyobo '14 Byron 200.
Isocyanate (curing agent)] applied in an amount of 1. og/m'
A wire bar (0.3 mmφ) was used to apply the adhesive layer to form an adhesive layer, and this was wet laminated onto Manila hemp paper (basis weight 11 g/m", thickness 40 μm) to form a porous sheet. Pasted together.

Next, a room temperature curing silicone resin [Toray Silicone PRX 305 (base resin), Toray Silicone SH23K (curing agent) manufactured by Toray Silicone Co., Ltd.] was applied as a stick prevention layer on the polyester film in a coating amount of 0.05 g/
A base paper for heat-sensitive stencil printing was prepared by coating and drying so that the color was m'.

On the other hand, card paper with a thickness of 150 μm and a stiffness of 20 g and 1 cm is used as a flexible reinforcing base material, and a cut (perforation) is provided at the boundary between the frame portion and the printable area. The sheet surface and frame are bonded together for reinforcement.

Next, an ink impermeable sheet with a thickness of 36 μm 1 Ra0.
The matted surface side of a matted polyethylene terephthalate film having a friction coefficient of 91 μmS of 0.38 was placed on a card paper, and one side perpendicular to the running direction of the original was adhered to obtain a heat-sensitive stencil original for use in the present invention.

When printing with a word processor using this, it is possible to print well without slippage between the ink-impermeable sheet and the flexible reinforcing base material during running, and then the printable area of the flexible reinforcing base material is marked with a perforation. After cutting it out and removing it, exposing the printed part of the porous sheet, applying ink according to the printed part and attaching it to a simple printing machine (if it is loosely attached, use an appropriate cardboard etc. as a cutter), it will be easily printed. I was able to print it. That is, for example, when printing was performed using Printcocco manufactured by Riso Kagaku Kogyo Co., Ltd., it was possible to print 100 clear prints that were faithful to the original.

Example 2 Thickness: 80 μm 5Ra3.1 as ink impermeable sheet
A thermal stencil original plate of the present invention was obtained in the same manner as in Example 1 except that tracing paper of 4 μm and a friction coefficient of 0.30 was used.

When this was used to print with a word processor in the same manner as in Example 1, the ink-impermeable sheet and the flexible reinforcing base material could be printed without slipping during running, and then 100 sheets were printed using a simple printing machine. As in Example 1, it was possible to obtain clear printed matter that was faithful to the original.

Comparative Example 1 Thickness: 36μ, Ra: 0124μ as ink impervious sheet
A comparative heat-sensitive stencil original was obtained in the same manner as in Example 1 except that polyethylene terephthalate having an m1 friction coefficient of 0.21 was used.

When this was used to print with a word processor in the same manner as in Example 1, slippage occurred between the ink-impermeable sheet and the flexible reinforcing base material during running, and the running stopped midway through printing.

<Effects of the Invention> According to the present invention, the surface roughness of the ink-impermeable sheet is defined to prevent slippage between the ink-impermeable sheet and the flexible reinforcing base material, so that printing by a word processor is not possible. This is easy to do, and since the printing area of this base material can be removed and printed immediately before printing, it is simple and inexpensive, and moreover, it is possible to print several hundred sheets clearly. .

[Brief explanation of the drawing]

Fig. 1 is a cross-sectional view of the heat-sensitive stencil base paper of the present invention, and Fig. 2 is a diagram showing the configuration of the heat-sensitive general-use base paper of the present invention. The plastic resin film layer, 4, represents a stick layer.

Claims (1)

[Claims] A flexible sheet of porous sheet for heat-sensitive stencils, which has at least an adhesive layer and a thermoplastic resin film layer sequentially provided on one side of the porous sheet, and a cut for cutting out the printing area on the other side of the porous sheet. In a heat-sensitive stencil original plate formed by adhering a frame portion of a flexible reinforcing substrate and adhering an ink-impermeable sheet to the frame portion of the flexible reinforcing substrate, at least the flexibility of the ink-impermeable sheet The center line average roughness of the surface roughness of the surface in contact with the reinforcing base material (JISB0601 definition and display of surface roughness) is 0.5 μm or more, and the coefficient of friction with respect to the surface in contact with the flexible reinforcing base material is An original plate for thermal stencil printing, characterized in that it has a particle diameter of 0.25 or more.