JPS6036956B2 - Heat-sensitive stencil printing base paper - Google Patents

Description

DETAILED DESCRIPTION OF THE INVENTION The present invention relates to a heat-sensitive stencil paper which, when irradiated with a light beam, generates heat by itself in the light-irradiated portion to form perforations, and a heat-sensitive stencil-making method.

Conventionally, as a stencil paper using a heat-sensitive method mainly using a thermoplastic resin film, as disclosed in Japanese Patent Publication No. 1976-7623 published on April 23, 1960, a heat-sensitive resin film subjected to a stretching process has been used. A base paper, characterized in that a sheet-like support that allows printing ink to pass through and does not change at the heating temperature necessary for perforating the main body is adhered to a main body made of a sheet, and the main body is perforated by infrared irradiation. and a copy comprising a heat-shrinkable film stretched over a screen and light-absorbing fine particles added to the heat-shrinkable film, as disclosed in Tokugan Sho 46-181593 (Patent No. 841178). It is also known as base paper.

Of these original papers, especially the latter, Machigao 46-So15
The copying base paper disclosed in the specification of No. 93 is itself highly light-absorbing, and is overlaid with an original document consisting of a light-transmitting section and a light-shielding section, and light rays rich in infrared rays are emitted from the document side. When irradiated with , the base paper generates heat and melts only in the light absorbing part due to the light passing through the light passing part, and a perforated image corresponding to the light passing part of the original is formed, and this copying base paper is It is not always necessary to bring the document and the film surface of the base paper into close contact, and since the heat-shrinkable film is stretched and supported by the screen, the melted birch of the heat-shrinkable film will not touch the screen intersections during perforation by light irradiation. It has the advantage of exhibiting high resolving power and obtaining fine and precise perforation images.
However, the above-mentioned copying base paper having a screen support requires raw materials such as expensive screens and adhesives, and also requires complicated manufacturing processes, so it has the disadvantage of being relatively expensive. . By the way, the applications of stencil printing are wide-ranging, and are not necessarily limited to applications that require fine and precise printing, but also applications such as relatively large images or images that should be visually recognized from a relatively distant place. There are also many applications that do not require fine and precise printing.

Examples include marking of symbols, lot numbers, etc. on lumber, iron plates, cardboard, electrical parts, etc., printing of manufacturing dates, printing of advertisements, billboards, general signs, etc. The present invention maintains the performance advantages of the heat-sensitive stencil paper disclosed in Japanese Patent Application No. 46-81593 while overcoming its economic disadvantages, and has a cheaper structure that allows it to be used in the light irradiation section. A novel heat-sensitive stencil paper is provided which is capable of producing distinct perforations due to absorbed light energy.

The invention will be explained with reference to the accompanying drawings.

FIG. 1 is an illustrative perspective view of the base paper of the present invention.

In FIG. 1, a base paper 1 is made of a heat-shrinkable resin film 2 to which a light-absorbing substance has been added and a substance that does not substantially melt at the temperature at which the resin film 2 melts, and is used for printing as in the embodiment described later. It consists of a multi-linear coating layer 3 coated on a film 2 by the method described above. FIG. 2 is a schematic sectional view showing the method of perforating base paper according to the present invention.

As shown in FIG. 2, in order to perforate the base paper 1, a negative image 4 is placed on the base paper 1 (however, the multi-line coating layer may be placed on either the upper or lower side), and the light of the negative image 4 is The light rays 5 transmitted through the transmission section 6 generate heat in the light-absorbing material, and the base paper 1
The heat-shrinkable resin film is melted and shrunk at a portion corresponding to the light transmitting portion 6, and then perforated. The resin film 2 existing in the perforated portion of the base paper 1 is collected around the multi-linear coating layer 3. By providing such a multi-linear coating layer, it serves as a screen that controls the melting law of the film and supports it, so by appropriately selecting its thickness, arrangement shape, and density, , it is possible to obtain a heat-sensitive stencil paper with a molten film birch support suitable for the fineness of the copied image. The base paper 1 may be irradiated with light on either side. In the present invention, the heat-shrinkable resin film to which a light-absorbing substance is added is one in which the light-absorbing substance is coated on the surface of the resin film, or is dispersed in the resin film.

Further, the resin film may be a single layer or a laminated film. As the heat-shrinkable resin film, if it is a stretched thermoplastic resin film, synthetic resins such as polypropylene, polystyrene, polyethylene, polyethylene terephthalate, vinyl chloride, vinyl chloride-Pini IJ dens chloride copolymer, nylon, butadiene resin, etc. A film can be used, and the thickness is preferably 100 mm or less, preferably 50 mm or less.

As the light-absorbing substance, carbon black and other pigments, heavy metal particles,
Dyes etc. can be used.

The material that does not substantially melt for forming the multi-linear coating layer may be any material that does not melt at the temperature at which the heat-shrinkable resin film melts, such as heat-resistant resins, thermosetting resins, and thermoplastics. Resins, dyes, pigments, etc. can be used. These resins or pigments may be dissolved in a well-known appropriate solvent and applied in a multi-line pattern onto a heat-shrinkable resin film by an appropriate printing technique such as screen printing. When the heat-shrinkable resin film evaporates, dries, and solidifies, a multi-linear layer is formed that maintains its shape without melting. The multi-linear coating layer may be formed according to a pattern such as parallel lines arranged in only one direction, parallel lines arranged in two or more directions, or any other straight line or curved line. It may be formed according to a mesh pattern consisting of a collection of .

As a method for providing a multi-linear coating layer on a heat-shrinkable resin film, known gravure printing methods, flexo printing methods, screen printing methods, etc. may be used. Normal stencil printing methods can be applied to obtain copies using the perforated stencil of the present invention, including methods using mimeograph ink, methods using powdered ink (toner), and methods using spray. etc. may be used. Example 1 Black ink (trade name, Marsu 74, manufactured by Staedtler Nippon ■) was coated on one side of a polypropylene film (trade name: Torejuan #9, manufactured by Toray ■) with a thickness of 9 mm and adhered to the other side. A base paper for heat-sensitive stencil printing was prepared by printing a 30-mesh lattice pattern using a screen printing method using the agent (trade name, Cemedine-57 manufactured by Cemedine ■).

Next, I made a negative drawing by cutting out a piece of paper with a thickness of 2 ribs and dimensions of 15 cm x 15 arcs into an H shape of the alphabet with a line width of 1 skin.

A negative image is printed on the black ink-coated surface of the prepared heat-sensitive stencil printing base paper, and a flash is irradiated from the negative side with an electronic flash irradiation device (trade name: Traven Up TU-250, manufactured by Riso Kagaku Kogyo ■). Perforated.

When the perforated base paper was placed on printing paper and mimeograph ink was applied from the base paper side with a rubber roller, a clear H
I was able to obtain a copy of the text.

Example 2 One layer of India ink was applied to one side of a pinychloride-vinylidene chloride copolymer resin film (trade name: Saran Film, manufactured by Asahi Dow Corporation) with a thickness of 11 mm, and a white poster color was applied to the coated side. A lattice-like pattern with a line width of 2 ribs and a checkpoint area of 2 skins x 2 sides was printed using a screen printing method to prepare a base paper for heat-sensitive stencil printing.

The negative image created in Example 1 is applied to the surface having a grid pattern on the created original paper, and the upper surface 5c on the negative side is 135
A 0W tungsten incandescent lamp was moved and irradiated at a speed of 5 k/sec to form holes.

The perforated base paper was placed on printing paper, powdered ink (toner) was sprinkled from the base paper side, and the toner was heat-fixed, resulting in a clear image with a collection of dots spaced 2 times apart with 2 ribs. I was able to obtain a copy of the letter H.

[Brief explanation of the drawing]

Fig. 1 is an illustrative perspective view of the base paper of the present invention, Fig. 2 is an illustrative sectional view showing the method of perforating the base paper of the present invention, and Fig. 3 shows the base paper perforated in the manner shown in Fig. 2. It is an illustrative cross-sectional view. 1 - base paper, 2 - heat-shrinkable resin film added with a light-absorbing substance, 3 - multi-linear coating layer, 4 - negative image, 5 - light rays, 6 -
Light transmitting part. Figure 1 Figure 2 Figure 3

Claims (1)

[Claims] 1 A multi-line shape formed by printing a substance that does not substantially melt at the melting temperature of the resin film onto a heat-shrinkable resin film to which a light-absorbing substance has been added. Heat-sensitive stencil printing base paper with a coating layer.