JPS58159531A - Manufacture of original screen plate for photoengraving - Google Patents

Abstract

PURPOSE:To obtain an original screen plate for photoengraving quickly and easily by depicting the figured line drawings of original designs for screen printing on a film, exposing and developing the same, and washing out the line drawing parts then sripping the densely painted parts of the original designs. CONSTITUTION:Line drawings 2 of the figures which are of 1:1 of the ordered figures or scaled down to about 1:50 or magnified to about 50 times are drawn by using a stationary for drawing with a pencil or black ink on a transparent tracing film, such as a polyester film which is matted on one or both sides, or photosection paper 7 which is printed thereon with sectional blocks in transparent ink. The resulted original picture film is brought into tight contact with a photosensitive peeling film 8, and is exposed and developed. The photosensitive film in the line drawing parts of the original picture is washed out in the stage of developing, whereby line drawings 9 are obtained easily and precisely. The densely painted parts of wide areas are scored with the cut lines at the peripheries in the previous stage; therefore, the unnecessary parts are stripped easily by lifting said parts by hand with the aid of the blade of a cutter or the like as an auxiliary implement.

Description

DETAILED DESCRIPTION OF THE INVENTION The present invention relates to a new method for producing a screen original for photoengraving in a screen printing plate making process. This provides an extremely quick and simple method compared to conventional methods.

In recent years, screen printing has been developed because the printed ink layer is very thick, so all types of ink can be used, the plate surface is flexible, the printing pressure is very low, and the cedar shape and size of the substrate are very flexible. Due to its q-+k features such as freedom, koyasu is spreading in a wide variety of fields. In particular, the development of so-called printed circuit board manufacturing technology for electronic circuits owes much to advances in screen printing technology. Furthermore, as IC Cal paths become smaller, screen printing technology, which is the heart of screen printing, is also required to be increasingly complex, precise, and speedy.

In the past, the cutting method used by Nobuko Kogyo was used for hobbyist screen printing, but today the photosensitive printing method is mainly used. Is there a difference between direct and indirect methods? The development of photosensitizers that can produce precise and sharp 1illll images in the photolithography process is also an important factor, but it is important to understand whether there is a difference between the direct method and indirect method. Precise and rapid production methods have become important prerequisites in the plate-making process.3 In photosensitive plate-making, basically, a master mold having a part for tracing the light beam and a part for dispersion is used. It is necessary to create a pattern on the screen mesh that is divided into areas where ink passes (openings) and areas where ink does not pass (resist areas). This prototype is the original screen image. In other words, if an opaque figure is formed on a transparent support and is densely layered on the surface of the photosensitive plate, and a light beam is turned on, the part of the opaque figure will block the light, and the transparent part will be exposed by exposing it to light in the order of exposure. Let it harden. When this is washed with water and developed, the film flows out in the areas not exposed to light, and remains as a resist in the areas exposed to light, creating a plate pattern.

The original screen image is made entirely of plastic, generally a polyester film, on which opaque figures in black or red are created using hand varnish or photography.

The simplest and most conventional method for making screen originals is to hand-draw them on a transparent plastic film using India ink (3) or drafting ink. Appropriate for As shown in Figure 1, (1) is a transparent plastic film.First, as shown in (I), drawing lines (2) are drawn, but it is difficult to draw the edges correctly. Transparent areas ([Yes]) must be filled in. Moreover, the areas drawn with a brush or pen must be completely black, and there must be no uneven or pale areas, so it is a job that requires a lot of effort and experience, and it is very difficult to do as mentioned above. It is not suitable for the recent market demands for precision and speed.

Next, as a good way to do this, IJ
A method using a cut-out film (or masking film) is also known. This involves creating a red or green film on top of a transparent base film that blocks chemical rays.Use a cutting knife or similar tool to cut this film along the outline of the design and peel off the unnecessary parts. Let it soak, leaving only the film on the design area. This state is shown in Figure 2. In Figure 2, (4) is a split cut film and (I) (
4) is a plan view with the image line cut out, and (■) is a large area of light-opaque area (3) after peeling off the unnecessary part of the film (5).
Indicates the state where . (6) indicates a cutting knife. Depending on this method, you can avoid making efforts to fill in the areas, but the drawing lines (6) with the cutting knife (6) can be avoided.
Cutting 2) is time-consuming and hurried, and in the case of an unskilled person, the base film 4 may end up being cut into various parts.

A film called a screen film is also known, in which a film is adhered to a base film, and the film is scored and tied with a needle to create a transparent line. This is limited to producing fine-line negatives, but then it must be converted into a positive by printing onto another photographic film, which is then used for printing. Moreover, it is not an easy method because it requires skill to break the membrane with a special instrument called a needle.

The present invention aims to compensate for the drawbacks of the conventional methods as described above and to provide complex screen originals precisely and quickly. The method of the invention will be explained in detail below with reference to the accompanying drawings. In Figure 3, (7) is usually a transparent tracing film with one or both sides matted, such as Mylar (trade name) film made of polyester film, or a transparent tracing film with red, blue, etc. Detailed 1z with ink
Photosection paper with a square grid printed at about 10% square from the corner, and a pencil or black ink on top of it for fine 2/tight writing A. For example, Ha Hole Pen, Soyap Pencil (product name), Rotring
) (Product name), Parker Space Pen (Product name)
etc., use The exposure is good when you take enlarged photos later, and the screen originals are small. On the other hand, if you enlarge an extremely small pattern and then reduce it later, you can obtain a fine pattern with precision. The lines can be drawn very easily using ordinary design tools, such as ordinary writing instruments such as those mentioned above. In particular, in the case of geometric figures, it is extremely simple to simply draw black straight lines from above according to the grid lines on the photo section.

Next, as shown in Figure 4, the original film was coated with a photosensitive peeling film (8), that is, a film made mainly of polyester film coated with a colored photosensitive resin film, and the photoresist film was applied to the non-exposed areas or during development. A film that can be washed out and the photosensitive cured film can be peeled off from the film, such as Photopeel YN (manufactured by Somar Kogyo Co., Ltd.) (trade name)
Expose and develop as usual.

Since the image area of the original image is opaque to light, the photoresist film in the image area is washed out during development, making it easy to precisely obtain image line (9) just as the cutter was inserted into the split cut film. It will be done.

Next, the large area filled in has lines cut around it in the above process, so the ink can be easily peeled off by hand by lifting the unnecessary part using a cutter blade or the like as an auxiliary tool. FIG. 6 is an original screen image produced by the production method of the present invention.

Intuitively, the method of the present invention has an extremely wide range of applications in shortening delivery times and reducing costs, since it is possible to precisely and quickly obtain complex original screen images for screen printing, which are currently required in the market.

Figure 7 shows an example of a printed circuit screen original plate using photosection paper obtained by this manufacturing method.
FIG. 3 is a plan view of an example.

[Brief explanation of drawings]

FIG. 1 is a diagram showing a conventional handwriting method, in which (I) shows a drawn state and (■) shows a filled state. Figure 2 is a drawing showing the same case where a conventional strip-cut film is used; (I) shows the state where the drawing line is cut;
(■) shows the state where the film has been removed from a large area of concern. Figure 3 shows the state in which lines were drawn on a matte transparent plastic film with a thin line writing instrument, Figure 4 shows the state in which a photosensitive peeling film is overlaid on the film, and Figure 5 shows the photosensitivity that has been washed out from the lined area after exposure and development. Peeling film, FIG. 6. Screen original (7) obtained by the manufacturing method of the present invention. FIG. 7 shows a screen original of a printed circuit according to an embodiment of the manufacturing method of the present invention. In the figure: (1) Transparent plastic film (2) Drawing line (3) Light opaque area (4) Split cut film (5) Unnecessary area film (6) Cutting knife (7) Transparent Or Photosecun Yong Film (8) Photosensitive Peeling Film (9) Image created by development March 1981 Patent applicant Tsunino Kogyo Co., Ltd. (8) Figure 1 I π Figure 2 I X Figure 3 Figure 5 Figure 4

Claims (1)

[Claims] 1 to 5 or 1 to 5 manuscript designs for screen printing
After drawing the drawing lines of the figure scaled to the desired degree or enlarged to about 5 o@ using a thin transparent M reed tool such as polyester film paper, adhere it to the Ganwon-jiang peeling film and image the dust on the nose. Then, after cleaning out the surface/composition part, the filled-in part of the manuscript design is peeled off by hand using the edge of a metal cutter as an auxiliary means, to quickly and easily produce a screen original for photolithography.