JPS595066A - Production of metal base printing plate for screen process printing - Google Patents

Abstract

PURPOSE:To enhance resolving power and printing accuracy, by a method wherein a photosensitive film is provided on a metal base plate produced, by plating a fabric formed of synthetic fibers with a metal, and after printing, the photosensitive film and the plated metal are removed to produce a printing plate. CONSTITUTION:A chemical electrically conductive film is provided on both side of the fabric produced by weaving synthetic fibers or stainless steel wires into a mesh form, a plated metal layer is provided on the outside surfaces of the conductive films, and then an ink layer is provided on the outside surfaces of the plated metal layers. A chemical electronically conductive film is again provided on the surfaces of the ink layers, a plated metal layer is provided on the surfaces of the conductive films, then the ink layers are removed by dissolving with an alkaline solution, and further a plated metal layer is provided. Then, the photosensitive film is placed in close contact with the surface of the thus obtained metal base plate, a copy film is placed the photosensitive film, exposure to light and printing are conducted, and unexposed parts of the photosensitive film are stripped, followed by etching.

Description

DETAILED DESCRIPTION OF THE INVENTION The present invention relates to a method for manufacturing metal-based printing plates for screen process printing.

Conventionally, flat screens made of synthetic fibers such as nylon or tetron, or mesh-woven stainless steel strips have been used for printing plates, but although printing ink can easily pass through nylon screens, they are easily affected by outside temperature. , as the fabric expands and contracts and is repeatedly used, it becomes loose, and while Tetron fabric has less looseness, it has the disadvantage of poor ink penetration, and in both cases, the intersection of the warp and weft is fixed. Because of this, the mesh tends to shift easily, and the durability for use as a printing screen is poor.Furthermore, since static electricity is generated, foreign matter can easily adhere to it and cause clogging, making it difficult to print with high precision. There is a problem of poor performance, and stainless steel wire is extremely expensive, and as with the first two, if the 5tN4 wire is misaligned -
There were some drawbacks.

In order to eliminate the drawbacks of the conventional method, the present invention creates a metal base plate in advance by applying metal plating to the synthetic fiber fabric stretched over the frame, and then a photoresist film is stretched over this metal base plate and then baked onto it. The photoresist film and metal plating are then removed to form a printing plate, and the purpose is to maintain the tension of the fabric during printing and improve resolution and printing accuracy.

An example of the implementation of the present invention will be explained with reference to the drawings. The upper, lower, left, and right edges (la) of the Tetron fabric +11, which is mesh-woven with Tetron fibers, are pulled to make the entire surface taut. ) Apply adhesive to the aluminum frame (A), glue and stretch the synthetic fiber fabric (1), which is 1 tension, to the aluminum frame (A), then dry and tension it, and then apply duct tape (C) to the periphery (1). Apply a rim and press the edges (Fig. 1), then degrease with a cleaner and oil pan.

Next, chemically conductive I film (
After forming 2) by spraying (Fig. 2), copper plating is performed in the plating bath l to form copper plating N131 (Fig. 3).
. After drying, apply double-sided IC alkali-soluble ink or resist ink to form ink N (4) (Figure 4)
. Then, a copper or nickel plating layer (6) is provided (FIG. 6). Then, apply the ink layer (4) to the caustic soda solution.
After washing with potassium carbonate solution, both sides are plated with copper or nickel to form a plating layer (7) (Fig. 8), and dried to finish the metal base plate (8).

A dry film (9) that will become a photosensitive film is tightly attached to the surface of this metal base plate +81 (!
9) Place original film (c) such as positive film or negative film on which characters, patterns, wiring diagrams, etc. have been photographed and developed (
(Fig. 40), use a mercury lamp to print - 1 Original film ρ After removing the positive film, unexposed portions)
When the dry film (9) is peeled off, the exposed area (a)
The dry film (9) has residual scratches (Figure 11). In this state, apply flux or rack varnish to the back side of the metal base plate (8), and then apply ferric chloride, steel chloride,
The chemically conductive IX film (5) and the copper plating layer 161 (f7+f) are dissolved and removed by etching using ammonium persulfate, high etchant, etc. (Fig. 12)
After washing with water, it is soaked in methylene chloride solvent, alkaline solution, and calcium carbonate solution lζ in order, washed with water, coated with @lf color inhibitor f, and then dried.

Since the present invention was manufactured by the above-mentioned process, when the printing plate is brought close to the printing material with a spacing of, for example, about 2 mm, and the printing ink is spread with a spatula, the printing ink is unexposed and the photosensitive film ( 9) and plating layer fi+ 17
1 is removed, the open state of the mesh is maintained, and the exposed portion 1. Since the mesh at t4 is covered with copper plating, ink does not pass through this area, and no printing is performed on the printing material in this area.

Therefore, according to the present invention, a -C printing plate is formed based on a metal substrate with metal plating applied to the fabric, without simply coating a photosensitive emulsion on a fabric made of Tetron or nylon synthetic fibers or stainless steel filaments and exposing the fabric to light. Therefore, when printing, the gap between the printing plate and the surface of the printing material can be kept very small. In addition, the photosensitive parts are plated with metal and the mesh is closed, leaving the surface in a flat state, so the parts where the warp and weft come into contact with the outside air are limited to the non-photosensitive parts, and this is combined with the fact that the photosensitive parts are plated in a flat state. There is almost no change in expansion or contraction due to the influence of outside temperature, and there is no sagging or wrinkles during use, so the mesh formed by the warp and weft does not shift, and the mesh accuracy is fine and protection is achieved. This allows printing ink etc. to pass through smoothly, increasing the thickness of the ink on the printing material, and making it possible to accurately express lines such as letters and figures with sharpness and clarity. In addition, since static electricity is less likely to be generated, the plate surface is not resistant to adhesion, and the plate surface is cleaned, making it possible to print clearly and making it possible to preserve and store the plate for a long period of time. Also, General 5 - Conventional photoengraving uses emulsion (water-soluble) emulsion or film containing emulsion, and the photosensitizer on the fiber is sensitive to moisture and humidity, such as when drying, causing stickiness and reversion. However, the photosensitive film was used only on the surface of the metal base plate without using photosensitive chemicals, and the photosensitive film was removed after baking and development. During use, especially during printing, the photosensitive agent does not peel off due to humidity, and the separation from non-photosensitive areas is kept clearly, improving the accuracy of the printing plate, increasing resolution, and improving the printing of printed materials. The accuracy is significantly higher than that of conventional methods. In the conventional method in which a photosensitive emulsion is coated on the fabric, there are variations in the emulsion that adheres to the outer periphery of the fiber for thick films, resulting in poor printing accuracy, but in the case of the metal substrate of the present invention, the plating bath Even if the thickness of the metal plating is increased by increasing the time the plate is left in the plate, a highly accurate thick film printing plate can be obtained. In addition, the passage of ink is very good, so
When printing patterns after through-hole plating is filled with ice, ink also adheres to the periphery of the holes, which prevents defects during etching. Even if the ink used for printing is water-based or oil-based, since the outer periphery of the =6 fibers of the fabric is covered with metal plating, the printing properties are good. In addition, the ink applied during the plate making process is alkaline and can be washed with caustic soda or sodium phosphate without using thinner as in the past, thereby preventing harmful effects on the body of the operator. In addition, with conventional screens made only of synthetic fibers, there was a risk of wire breakage due to snagging, but because the state of the fibers is only visible in the non-light-sensitive areas, there is less risk of damage and it will last for a long time. Can be used across the board. Furthermore, when printing multiple times, different types of ink are used,
The composition of the ink prevents any negative effect on the elasticity of the warp and weft, and maintains the elasticity of the synthetic fiber core, while at the same time achieving good ductility and hardness of the metal due to the plating. It has a restoring force, has appropriate flexibility and strength, and has adaptability to the substrate during printing, and at the same time has excellent resolution and abrasion resistance.

[Brief explanation of drawings]

The figures show an embodiment of the present invention. Figure 1 is a perspective view of an aluminum frame with Tetron fabric stretched over it, with a portion of the surrounding tape torn off, and Figure 2 is the same as that of Figure 1. A partial cross-sectional view taken along line AA, Figure 3 is a cross-sectional view of a portion of Tetron fabric with a chemically conductive film formed on both the front and back sides, and Figure 4 is a partial cross-sectional view of the
Figure 5 is a cross-sectional view of the item in Figure 4 with an ink layer formed on both sides, and a cross-sectional view of the item in Figure 4 with an ink layer formed on both sides. 1 in Figure 51 is also lΦ
) Figure 7 is a cross-sectional view of a part of the one shown in Figure 6 with a copper plating layer formed only on the surface. Figure 9 is a cross-sectional view of a part of the one shown in Figure 8 with the ink layer removed. 1
Figure 0 is a cross-sectional view of a portion of the one shown in Figure 9 with a dry film pasted on its surface, Figure 11 is a perspective view of a metal base plate with a negative film as an original placed on the dry film, and Figure 12 The figure is a cross-sectional view of the main part of the BB line after exposure and printing after removing the dry film in the non-exposed area, and Fig. 13 is a cross-sectional view of the main part of the completed printing plate after etching and etching the plate shown in Fig. 12. FIG. Code: 1...Tetron fabric 8...Curved metal base plate la...periphery 9.
・・・・・・Kan NIA” (Krai Film) 2...
......Chemical conductive coating 1o...Punched hole part 3...Metal layer A...
......Aluminum frame 4...Inner layer Mouth...Gum tape 5
・・・・・・・・・Chemical conductive coating Ha・・・・・・・
・・Original film 6・・・Plating layer
2......Unexposed portion 7...
Me / Side / Ki 1 layer Ho...Exposure part 1
July 2, 1981 Inventor: 1) Shigeo Patent Applicant: Limited Partnership Company: 1) Chamber of Commerce 9-133° JP-A-5A-5oee (4)

Claims (1)

[Claims] Synthetic fiber A is a fabric made of a mesh weave of stainless steel strips, with a chemically conductive wall film provided on both the front and back sides, a metal plating layer applied to the outer surface of the chemically conductive plain film, and then the metal plating layer plating layer is formed, and then the above-mentioned The ink layer is melted and removed with an alkaline solution, an additional 6C metal plating layer is applied, a photoresist film is closely laid on the surface, the original film is placed on the photoresist film, fog light printing is performed, and the photoresist film in the unexposed areas is peeled off. A metal-based printing plate for screen process printing that is then etched.