JPS6250136A - Method for engraving thermal screen printing stencil - Google Patents

Abstract

PURPOSE:To enhance resolving power, by providing a conductive layer and a photosensitive layer to the surface of the thermoplastic synthetic resin film of a thermal screen printing stencil and forming a black toner image on the photosensitive layer before irradiating said photosensitive layer with flash light of a xenon lamp. CONSTITUTION:An ink-pervious porous support 1 and a thermoplastic synthetic resin film 3 are laminated by an adhesive 2 to form an autographic stencil and a conductive layer 4 is provided to the film 3 and a photoconductive photosensitive layer 5 is provided on said conductive layer 4 to form a thermal screen printing stencil 6. Next, a manuscript 21 is irradiated with the light of a manuscript irradiating lamp 8 and the photosensitive layer 5 is irradiated with an image through an optical system consisting of a mirror 9 and a lens 10 to form a latent image which is, in turn, developed by wet toner in a wet developing part to form an image. Subsequently, the thermal screen printing stencil 17 having the toner image 16 formed thereto is irradiated with flash light of an infrared containing xenon lamp 18 from the side of the photosensitive layer 5 to melt the film of the part corresponding to the toner image.

Description

DETAILED DESCRIPTION OF THE INVENTION [Technical Field 1] The present invention relates to a method for making a heat-sensitive stencil paper for use in mimeograph printing.

[Prior Art] So-called heat-sensitive stencil paper, which is made by bonding a thermoplastic synthetic resin film to a porous support that allows ink to pass through, is well known in the past, and the following methods are used to perforate this base paper. It has been adopted.

(1) The original is placed in close contact with the film surface of the base paper, and strong light including infrared rays, such as halogen lamp light or xenon flash light, is irradiated from the porous support side, and the image area absorbs the heat rays and the generated heat is used to remove the heat. (2) A method of melting and perforating the film by contacting and scanning the film surface of the base paper with a thermal element such as a thermal head. However, with method 1), uniform perforation cannot be obtained unless the original and film are brought into close contact with each other; (b) originals other than sheet originals, such as books, cannot be used (it is virtually impossible to perforate the original); Since it is essential that the image area of the original absorbs infrared rays and generates heat, there are restrictions on the drawing material, and only black images containing carbon black will be perforated (substantially wet PPC There are disadvantages such as the original being contaminated with melted film, release agent (film overcoat agent), etc.
On the other hand, method (2) requires an expensive drilling device such as a thermal head, including a digital image processing circuit.
(0) It takes time to finish drilling because it scans and drills.Q9 Melted film and anti-stick agent adhere and accumulate on the thermal head, etc., so it is necessary to clean the rad. 2) Dot drilling ←) Due to the limited energy applied to the thermal head, thick films cannot be perforated, while thin films are expensive and difficult to laminate with porous supports. Ta.

[Objective] It is an object of the present invention to provide a method for making a heat-sensitive stencil paper without the drawbacks of the prior art as described above, and more specifically, it is an object of the present invention to provide a method for making a heat-sensitive stencil paper that does not have the drawbacks of the prior art as described above. The object of the present invention is to provide an improved method of plate making according to the above (1), that is, a method of perforating a heat-sensitive stencil paper by irradiating light containing heat rays.

[Structure] In the present invention, the intended purpose has been achieved by combining an electrophotographic method with the heat-sensitive stencil plate making method of (1) above.

The configuration of the present invention will be explained in more detail using FIGS. 1 to 3. In the plate-making method according to the present invention, as shown in FIG. After providing the conductive layer 4 on the film surface of the base paper, a conductive layer 4 is further provided on the conductive layer 4 which has a property of being melted and destroyed by heat, or destroyed at the same time as the film 3 is melted and destroyed by heat. A heat-sensitive stencil paper 6 provided with a photoconductive photosensitive layer 5 is used.

The conductive layer 4 is preferably made of thermoplastic conductive resin. Further, the photoconductive photosensitive layer 5 is desirably composed of a combination of zinc oxide and a thermoplastic synthetic resin binder, or a combination of an organic photoconductive substance and a thermoplastic synthetic resin binder. In the present invention, the thickness of the conductive layer 4 is 0.5-5μ, preferably 1-3μ, and the thickness of the photosensitive layer 5 is 2-10μ, preferably 3-7μ. If both are too thin, the purpose will not be achieved, and if too thick, perforation will be poor.

Next, a black toner image is formed on the surface of the photosensitive layer 5 of this base paper 6 using an electrophotographic method, as shown in FIG.

First, the original 21 is placed on the original contact glass 7, and then the photosensitive layer of the heat-sensitive stencil paper 6 having the above structure is negatively charged by the corona charging charger 11.

Next, the original is irradiated with light from the original irradiation lamp 8, and an image is irradiated onto the photosensitive layer through an optical system including a mirror 9 and a lens 10 to form a latent image.

Next, the heat-sensitive stencil paper on which the latent image has been formed is sent to a wet type developing section by a feed roller 13, and an image is formed using wet toner. Note that 14 is a counter electrode plate that also serves as a guide plate.

The heat-sensitive stencil paper in the developing section is squeezed by a squeeze roller 15 to remove excess developer.

As shown in FIG. 3, the flash light of the xenon wrap 18 containing infrared rays is applied to the heat-sensitive stencil paper 11 on which the toner image 16 is formed in the area corresponding to the image area of the original document obtained in this way. is irradiated to melt the film in the area corresponding to the toner image and perforate it. At this time, the photosensitive layer is also perforated at the same time, and a plate-made image can be obtained. In the figure, the base paper 17 is conveyed by the feed roller 20, but the lamp 18 may be configured to move in reverse. 19 is a reflecting plate. Note that there are generally three methods for forming a toner image: a dry development method and a wet development method, and in the present invention, the toner image is formed by the same method as the wet development method, the so-called electrofax method. The reason why a wet development method is adopted for forming a toner image in the present invention is that the following problems occur when a dry development method is used. Firstly, the particle size of powder toner is much larger than that of liquid toner, and the formed toner image has an extremely large amount of toner particles attached and the layer is thick. If the film is perforated by irradiation,
The toner particles may melt, resulting in poor perforation, or the porous support may become clogged, resulting in extremely poor ink copyability. Second, many toner particles are scattered in non-image areas, causing background stains, and since the particle size is large, those areas are perforated by flash light irradiation, resulting in printed matter with a lot of background stains.

When a toner image developed with a dry toner is subjected to plate making by irradiating a flash light, the quality of the 1ijj image of the printed material is far inferior to that obtained using a wet toner.

By setting the perforated heat-sensitive stencil paper obtained as described above in a general mimeograph printing machine and printing, a large amount of mimeographed materials can be obtained in a short time.

Incidentally, it is of course possible to perform all of these series of operations continuously and in an automated manner, and it is also possible to integrate the electrophotographic image forming section shown in Fig. 2 and the flash perforation section shown in Fig. 3. , and the mimeograph machine, and it goes without saying that these three may be separate.

EXAMPLES Hereinafter, the present invention will be explained in more detail with reference to Examples, but the present invention is not limited to these.

[Example] Example 1 Polyester film with a thickness of 2μ and tsubo ff112g/γ
Tengucho paper of rL2 was pasted together using vinyl acetate-ethylene copolymer resin. In addition, the amount of adhesive resin attached is 2~
The density was adjusted to 3y/m2 and applied to a polyester film using a wire bar (0.3#φ), and bonded together using a wet lamination method. The following composition [Nirekondo PQ-20J (conductive resin manufactured by Soken Chemical Co., Ltd.)] was applied on the film surface of the base paper thus prepared. ) 150g was dissolved and diluted with methanol and medylketone and applied with a wire bar and dried to form a conductive layer with a thickness of 2μ.On top of this conductive layer, the following composition (Nihon Kanko Shiki Co., Ltd. 0.07 g (powder) of polycarbonate resin "Panlite L" (binder resin made by others) 1 g (Berret) dissolved and diluted with dichloroethane solvent, applied with a wire bar, dried and thickened A heat-sensitive stencil paper was prepared by forming a 5 μm photosensitive layer. J5, "Panlite L" and rRs-0170J are in the form of pellets and powder, respectively, so they were each dissolved in dichloroethane before use.

Example 2 A polyester film and Tengucho paper were laminated together in the same manner as in Example 1, and a conductive layer was further provided.The following composition was applied on the conductive layer of the base paper: Brominated polyvinylcarbazole 100gRhodamine B dye 0.07g ( A heat-sensitive stencil paper was prepared by dissolving and diluting J-Panlite L 109 in dichloroethane and applying the solution using a wire bar and drying to form a photosensitive layer with a thickness of 4 μm.

Example 3 200 g of the following composition ``Oligo Z Hlolo, 1'' (conductive resin manufactured by Tagawa Paper Mills) was added to the film surface of a base paper made by laminating a polyester film and Tengucho paper in the same manner as in Example 1 in methanol. A base paper was prepared by dissolving and diluting the solution with a wire bar and drying it to form a conductive layer with a thickness of 2 μm.A photosensitive layer similar to that in Example 1 was coated on this conductive layer with a wire bar. A heat-sensitive stencil paper was created.

Example 4 In the same manner as in Example 1, [Gohsenol C
-680J (Nippon Gosei! IL) was diluted and applied with a wire bar, and then dried to form a conductive layer with a thickness of 1 μm.

Separately, a paint was prepared by dispersing 140 tJ of toluene of the following composition in an emulsion for 5 minutes, and this was applied onto the conductive layer of the base paper using a wire bar and dried to a thickness of 5.
A heat-sensitive stencil paper was prepared by providing a photosensitive layer of μ.

Example 5 The following composition was applied on the conductive layer of the base paper coated with the conductive layer prepared in Example 4: Zinc oxide rsX-9J 100 g Rose Bengal (5% methanol solution) 1.5 g Brominated polyvinyl carbazole 100 g Byrylium salt dye 0.07 (j “Panlight LJ
(Pellet) A paint made by dispersing 1 g of toluene and chlorobenzene was applied with a wire bar and dried to form a photosensitive layer to prepare heat-sensitive stencil paper.

The thermal stencil paper with the photosensitive layer formed in Examples 1 to 5 was transferred to the Ricoh B5 electrofax copying machine.
After image formation using 250, TRAVEN UP 1J27
5 (Riso Kagaku Kogyo), a perforation image was obtained by irradiating with flash light. When the heat-sensitive stencil paper thus prepared was printed using a mimeograph machine Ricoh Hyblink-320, clear mimeographed prints were obtained from all samples.

[Effects] The plate-making method of the present invention has the following effects compared to the conventional plate-making method that employs a perforation method using infrared irradiation (a method in which the original and the film are brought into close contact with each other).

(1) Since it is possible to perforate documents without placing the film in close contact with the document, it is possible to print other documents than sheet documents.

(2) The original will not be soiled.

(3) Since the toner image is formed on the film, the resolution is better than that of closely spaced perforations.

(4) It is possible to print from originals other than those for black drawing containing carbon black.

(5) There is no need to create a manuscript for plate making using an RPC copier.

Furthermore, compared to a plate-making method that uses a writing method using a thermal head, the manufacturing cost is much lower, and since the time required for plate-making is less, there is an advantage that the overall process time is also shortened.

[Brief explanation of drawings]

FIG. 1 is a schematic diagram showing the structure of a heat-sensitive stencil paper according to the present invention, FIG. 2 is a cross-sectional view of an electrophotographic image forming section, and FIG. 3 is a cross-sectional view of a flash perforation section. 1...Porous support 2...Adhesive 3...
-Synthetic resin film 4...Conductive layer 5...Photosensitive layer 6...Base paper 7...Original table and contact glass 8...Halogen lamp for light source 9...Mirror 10.
・・Lens 11 ・・Danger 1
2... Wet type development tank 13... Feed roller 14... Counter electrode/guide plate 15... Squeeze roller (squeezing roller) 16... Image area 1-ner 17... Heat-sensitive stencil paper 18・
...Xenon wrap 19...Reflector plate 20...
・Feed roller 21... Original Figure 1/? Figure 3

Claims (1)

[Claims] 1) A conductive layer is provided on the surface of the thermoplastic synthetic resin film of a heat-sensitive stencil paper made by laminating a porous support capable of ink copying and a thermoplastic synthetic resin film, and a conductive layer is further applied on the thermoplastic synthetic resin film surface. After a conductive photosensitive layer is provided and a black toner image is formed on the photosensitive layer by electrophotography, a flash of xenon wrap containing infrared rays is irradiated to melt and melt the portion of the film corresponding to the toner image. A method for making a heat-sensitive stencil paper for mimeograph printing, which is characterized by perforation. 2) The method for making a plate for thermal stencil paper according to claim 1, characterized in that a toner image is formed by developing with a wet developer. 3) The method for making a thermosensitive stencil paper according to claim 1, wherein the conductive layer is mainly composed of a thermoplastic conductive resin. 4) The photosensitive layer having photoconductivity is mainly composed of zinc oxide and a thermoplastic synthetic resin binder and/or an organic photoconductive substance and a thermoplastic synthetic resin binder. A method for making a heat-sensitive stencil paper according to claim 1.