JPH0452800B2 - - Google Patents

Description

[Detailed description of the invention]

(Industrial Application Field) The present invention perforates heat-sensitive stencil paper with a thermal head to form a normal-rotation perforation image, and finally obtains a print of a normal-rotation image with less thickening and bleeding. It is about the method. (Prior Art) Conventionally, in the plate making method for thermal stencil paper, an infrared lamp or a xenon flash tube is used to apply thermal stencil paper onto a document that has been printed or written with a heat-absorbing coloring agent such as carbon black. In this method, light was irradiated through the heat-sensitive stencil paper, and the heat absorbed by the print on the manuscript melted and perforated the film of the heat-sensitive stencil paper. In recent years, word processors, which are word processing machines that use thermal printers, have made remarkable progress, and it has become possible to easily process complex characters such as kanji and figures as output from printers. (Problem to be Solved by the Invention) However, when making multiple copies using the above method, the steps are as follows: create a manuscript with a word processor → make plates on heat-sensitive stencil paper with a plate making machine → print with a printing machine. Three types of equipment were required: a word processor, a plate-making machine, and a printing machine. Therefore, the inventor of the present invention has studied various ways to simplify the above method and efficiently make multiple copies from a word processor original.As a result, the inventor has decided to use a thermal printer as the word processor and use thermal stencil paper as the base paper. They discovered that heat-sensitive stencil paper could be made without a special plate-making machine by using a heat-sensitive stencil paper made by laminating a thermoplastic resin film and a porous support, and heating elements arranged one-dimensionally on the thermoplastic resin film side. is applied directly to the thermoplastic resin film, the heating elements are moved at right angles to the arrangement direction, and a pulse-modulated current is applied to the heating elements to form a two-dimensional dot matrix-like perforation image on the surface of the thermoplastic resin film. We proposed a method for producing characteristic heat-sensitive stencil paper. (Japanese Patent Application No. 59-79020) However, in the case of the above method, as shown in FIG. 3 is abutted to form a perforation 4, and a perforation image 5 is formed.
(see Fig. 2) and print as a normal rotation image 6 (see Fig. 3) as seen from the film 1 side.
As shown in the figure, ink must be supplied in the direction of the arrow (→), that is, from the film 1 side to the film support 2 side. This is because, as shown in FIG. 5, when ink is supplied from the film support 2 side to the film 1 side as in normal printing, the reversed image 7
(see figure). Therefore, the inverted perforated image 8, which is the reverse side of the perforated image 5,
(See Figure 7) A circuit was required for a thermal printer. (Means for Solving the Problems) Therefore, the present inventor proposed a method that does not require a circuit for perforating a reverse image in a thermal printer, by supporting a normal image from the film side through holes in the perforated thermal stencil paper. However, since the present invention uses a thermal printer, the film thickness of the thermoplastic resin film needs to be 10μ or less due to its perforability. Since the thermoplastic resin film is thin, a porous film support is essential from the viewpoint of operability during plate making and printing, and durability during printing. However, when printing by supplying ink from the support to the film side through the holes in the film with the reverse image perforated as in the past, the film comes into contact with the printing paper, whereas the film with the normal image perforated Since ink is supplied from the film side to the support through the holes to perform printing, the support inevitably comes into direct contact with the printing paper, resulting in the print 9 (No. 8 (See figure). Therefore, the present inventors conducted intensive research from various angles such as the material, weight, surface treatment, and post-processing of the porous film support. - By processing with B-type block polymer, printed matter 1 with less thickening and bleeding
0 (see FIG. 9), and completed the present invention. That is, the present invention provides a heat-sensitive stencil paper in which a thermoplastic resin film and a porous film support are bonded together, a thermal head that slides in contact with the thermoplastic resin film of the heat-sensitive stencil paper, and a thermal head that slides in contact with the thermoplastic resin film of the heat-sensitive stencil paper; A thermosensitive stencil printing method comprising a means for perforating the thermoplastic resin film by heating a selected heating element, and supplying ink from the film side to the support through the perforations formed in the thermoplastic film for printing. The gist of the present invention is a heat-sensitive stencil printing method, characterized in that the porous film support is impregnated or coated with an AB type block polymer containing a perfluoroalkyl group as one component. (Structure of the Invention) The present invention will be described in detail below. The main components of the base paper used in the present invention include a thermoplastic resin film, a porous film support, and an adhesive for bonding the two together. Note that, if necessary, a release agent may be used to prevent the thermoplastic resin film and the thermal head from being fused together. As the thermoplastic resin film, a film made of thermoplastic resin such as polyester resin film can be used. In the present invention, since the holes are perforated by a thermal head, the film thickness is preferably 10μ or less.
It is 3μ or less. Porous film supports include thin paper made by mixing natural fibers such as kozo, mitsumata, and manila hemp, and chemical fibers such as rayon, vinylon, and polyester with natural fibers, as well as thin paper made by mixing these thin papers with screws. You can use materials that have been treated with water-resistant resin such as Coase. The method of bonding a thermoplastic resin film and a porous film support is to apply an adhesive such as polyvinyl acetate, polyvinyl chloride, synthetic rubber, natural rubber, or polyester to the thermoplastic resin film or porous film support. A method of bonding by coating on a film support, and JP-A-58-188696
There are bonding methods using a gravure printing method as shown in Japanese Patent Publication No. 55-47997, and a method of bonding by impregnating a porous film support with a synthetic resin liquid as in Japanese Patent Publication No. 55-47997. Incidentally, depending on the type of adhesive, a curing agent may also be used in combination. In order to prevent fusion between the heating element and the film surface during plate making, fatty acids such as stearic acid and oleic acid or metal salts thereof, Various known release agents such as silicone resin can also be applied. Next, the essential treatment for the porous film support will be described.
It is impregnated or coated with a B-type block polymer, and the perfluoroalkyl group is essential as a functional segment, but the compatible segment is particularly limited if it is a vinyl group such as an acrylic group. It is not something that will be done. The amount of treatment is not particularly limited, but if it is too large, the porous network structure of the porous film support will be destroyed, making it difficult for the ink to pass through, so it should be 10 g/m ²
It is preferable to use the following amount. Further, the reason why the impregnation or coating treatment can prevent printed matter from thickening or bleeding is that the porous film support 2 is impregnated or coated with an A-B type block polymer containing a perfluoroalkyl group as one component. By doing so, the vinyl group, which is a compatible segment, which is the other component of the A-B type block polymer containing a perfluoroalkyl group as one component, adsorbs and becomes compatible with the surface of the fibers constituting the film support 2. As a result, perfluoroalkyl groups, which are functional segments, migrate to the surface, and the critical interfacial tension on the fiber surface is extremely reduced, resulting in a highly water- and oil-repellent property. It is believed that this makes it difficult for the particles to diffuse, and a printed matter with almost no thickening or bleeding as shown in FIG. 9 can be obtained. Next, the thermal stencil printing method of the present invention will be described.
First, the above-mentioned thermal stencil paper is plate-made as it is using a normal thermal printer (one that outputs normal rotation images) to create a normal rotation perforation image (see Figure 2), and then the thermoplastic resin film of the thermal stencil paper is printed. Normal printing is carried out by setting the heat-sensitive stencil paper so that its side is in contact with the drum surface of the rotary press, in other words, so that the porous film support is in contact with the printing paper. That is, with this setting, during printing, the ink passes from the thermoplastic resin film side to the porous film support side, so that the printed matter becomes a normally rotated image. Although the above printing method has been explained using a rotary press, the same method can also be applied to a printing press that does not use a rotary press. It is best to print so that the ink passes in the opposite direction. (Example) A scale made of Manila hemp used as a stencil master as a porous film support
Using 11.0g/ ^m2 Japanese paper (manufactured by Nippon Shigyo Co., Ltd.), a 1.5μm polyester film was used as a thermoplastic resin film.
Using an emblem (manufactured by Unitika Co., Ltd.) with a thickness of
In addition, as an adhesive, vinylol SE-H (manufactured by Showa Kobunshi Co., Ltd.), which is a polyvinyl acetate adhesive, was diluted with 2-butanone and adjusted to a solid content of 15%, or a polyester adhesive. Byron-50AS
(manufactured by Toyobo Co., Ltd.) was diluted with ethyl acetate to remove the solid content.
The one adjusted to 15% was used. The lamination method was a direct gravure coating process in which an adhesive was applied to a thermoplastic film, followed immediately by a wet lamination process in which a porous film support was laminated. A release agent solution prepared by heating and dissolving sodium stearate in ethanol to adjust the solids content to 7% is applied directly to the thermoplastic resin film surface of the above porous film support with a thermoplastic resin film laminated to the porous film support. It was coated and dried to obtain a heat-sensitive stencil paper. The porous film support used in this heat-sensitive stencil paper was treated under the conditions shown in Table 1 below.

[Table] Using the heat-sensitive stencil paper obtained in Samples 1 to 8 above, Examples 1 to 2 were prepared using the following plate-making method and printing method.
5. The results of the thermal stencil printing methods of Comparative Examples 1 to 3 are shown in Table 2. <Plate-making method> A writing machine equipped with a thermal head (letter/plate-making method)
Using a printer (manufactured by Pentel Co., Ltd.), and with the thermal transfer tape for printing removed, the thermal stencil paper obtained in Samples 1 to 8 was directly mounted on the printer, and the thermoplastic resin was used as shown in Figure 1. A plate was made by bringing a thermal head into contact with the film surface and perforating it with normal normal rotation image output. <Printing method> As a printing press, Tensha rotary press: Dupromate M
-760 (manufactured by Dupro Co., Ltd.) and an ink for rotary copying machines (manufactured by Megami Ink Industries Co., Ltd.), the thermoplastic resin film side of the heat-sensitive stencil paper was mounted on the drum, and the As shown in Figure 4, printed matter was obtained by printing using a printing method in which ink was supplied from the thermoplastic resin film side.

[Table] (Effects of the Invention) As described above, the thermal stencil printing method of the present invention uses a normal thermal printer (normal image output) and printing machine to easily thicken and produce clear normal images with little bleeding. The printed matter is excellent.

[Brief explanation of drawings]

FIG. 1 is an explanatory diagram showing the state of plate making. FIG. 2 is a diagram showing a normal rotation drilling image. FIG. 3 is a diagram showing a normal rotation image.
FIG. 4 is an explanatory diagram showing the printing state of the present invention. FIG. 5 is an action explanatory diagram showing a normal printing state. FIG. 6 is a diagram showing an inverted image. FIG. 7 is a diagram showing an inverted perforation image. FIG. 8 is a diagram showing printed matter that is thick and has blur.
FIG. 9 shows a printed matter obtained by the method of the present invention. 1...Thermoplastic resin film, 2...Porous film support, 3...Heating element, 4...Perforation.

Claims (1)

[Claims] 1. A heat-sensitive stencil paper in which a thermoplastic resin film and a porous film support are bonded together, a thermal head that slides in contact with the thermoplastic resin film of the heat-sensitive stencil paper, and a selected heating element of the thermal head. In the thermosensitive stencil printing method, the thermoplastic resin film is perforated by heating the thermoplastic resin film, and ink is supplied from the film side to the support through the perforations formed in the thermoplastic film for printing. A heat-sensitive stencil printing method characterized in that a film support is impregnated or coated with an AB type block polymer containing a perfluoroalkyl group as one component.