According to the report of the Japan Screen Printing Technology Association Information Magazine, the production volume of Japanese CDs has reached 3 billion in recent years. Due to the rapid development of computer technology, various kinds of software continue to emerge, especially the cultural and educational, cultural and entertainment, television, movies and all kinds of CD-ROMs published in various publications. 90% of the printing of company logos (images, texts) on such CD-ROMs is screen-printed, with the remaining offsets accounting for 5%, and flexographic and other printing methods accounting for 5%. Why screen printing can account for such a large proportion in CD printing? Because screen printing equipment has less investment, low cost and convenient plate making, it is suitable for the characteristics of multi-variety printing of CDs. In particular, the material of the CD disc is polycarbonate, which is suitable for screen printing as a substrate. The screen printing method can not only perform field printing, but also can perform 4-color processing screen printing, and can achieve clear images.
The types of screen-printed CD-ROMs are: 8cm CD, with an outer diameter of 76mm or less, an inner diameter of 46.5mm or more, and a 12cmCD with an outer diameter of 116mm or less and an inner diameter of 46mm or more. The screen printing machines used for printing CDs are five-color disc type screen printing machines manufactured by Japanese culture Seiko and foreign AUTORLLL and KAMMAN, all of which are fully automatic sealed and printed CDs.
More than 80 colors of ink can be printed on CDs. Since UV inks have advantages such as fast curing speed, strong hiding power, good adhesion performance, no solvent, no pollution, etc., they have unmatched advantages over traditional solvent inks. UV screen solid inks are used for Japanese screen printing CDs. Use UV light solid ink screen printing CD disc, the ink layer is more than 20 microns.
Japan Imperial Ink Co., Ltd. has recently developed a series of UV-curable inks, which have the advantages of convenient use, strong three-dimensional impression, and clear patterns, low cost, and good quality. Such as the CD disk UV curing ink is a CD disk screen printing pattern of special ink, its biggest feature is the transparency of the ink is good, suitable for fine pattern screen printing.
Recently, it has been noticed that UV inks for DVD disk printing have been developed. The DVD disc is a configuration in which two 0.6mm CD discs are affixed together. The minimum gap is 0.4 μm, which is quite narrow, so the DVD disc has higher precision than the CD disc. UV-curable resins generally have solid shrinkage. Once printed on a DVD, the UV ink used for CD disk printing has a large cure shrinkage, and it is not possible to limit its deformation within a specified range. Therefore, the DVD ink is made by combining a UV-curing polymer and a monomer together with a special filler to achieve the requirement of low curing shrinkage.
The angle of the squeegee of the printed CD is 90°, the thickness of the squeegee is 6mm to 7mm, the width is 40mm to 70mm, the length is 10mm, the hardness is 80° to 90°, and sometimes 70° is also useful.
Silk screen printing CD-ROM, plate-making network should use 260mm × 300mm or 320mm × 320mm aluminum frame, and to ensure the flatness of the frame and adequate frame tension. Silk screen selection of 250, 300, 310, 400, 460 Sakura Brand brand new ultra-high tension wire mesh, tension control in 10 ~ 11 (kg/cm3). The thickness of the film emulsion is between 40μm and 10μm for 310 mesh screens, and the emulsion thickness is 8μm. The required stretch angle is 22°. If a 350 mesh screen is used, the emulsion thickness is 4μm and the stretch angle is 12°.
Photosensitive adhesive developed by Murakami Screen Co., Ltd. Japan, a new generation of non-diazo SBQ single-liquid type photosensitive adhesive or non-diazo SBQ straight-film film, sensitivity is higher than the diazo photosensitive adhesive 3 to 5 times, exposure time About 1/5 of diazo, the quality of plate making is good, the resolution is high, the film surface is smooth, the lines are clear, and ultra-fine images of CD discs can be printed.
In recent years, the trademark CD CD-ROM printing accounted for a large proportion, and the requirements for quality have become higher and higher. 80% of them all require 4-color screen printing and require no moire. This raises new issues for screen-printed CD-ROMs. The key issue of screen printing for halftone 4-color CDs is how to overcome the problem of moire. CD half-tone screen printing, the positive film is produced by electronic separation or desktop typesetting system screen color yellow (Y), product (M), blue (C), black (K) 4 positive image. The screen printing substrates are many, and the 4-color screen printing of polycarbonate as a printing material for a CD disc is screen printing. If the angle of the screen, the angle of the screen, and the angle of the screen stretching are not good, Patterns that are as regular as geometric patterns, that is, moire patterns, are often formed. The research and implementation of the technology development department of Murakami Screen Co., Ltd. in Japan has been conducted. They believe that the quality of the manuscript selected for the production of the CD must be better. The positive print negative film can be produced by the desktop typesetting system, and the dot size can be freely selected by the dot generator device. , The shape and size of the outlets, and the number of screening screens on the screen can be 80 lines to 133 lines. The ratio of the number of screening screens on the screen to the number of screen meshes should be 1:3.5, but do not select 1: 3 or 1:4, if the number of screen lines is 100 lines, a screen of 350 mesh can be selected. Not only that, but also considering that the angle of the screen and the dot selection of the dot must be properly matched and reasonable to solve the problem of moire. Usually, the angles of screen-printing four positive-working color separation sheets are: Y-0°, C-15°, K-45°, and M-75°; if the skin color is dominant, Y and M colors are staggered by 45°. That is: Y-0°, C-15°, M-45°, K-75°, if landscapes: Y-0°, K-15°, C-45°, M-75°. Using the above method to print CDs can improve the quality and basically overcome the problem of moiré. Since the screen is the support of the printing plate, the screen is also the main cause of moiré. Therefore, in order to thoroughly solve the problem of moiré, we must start from the research and development of screen mesh. Now Murakami Screen Co., Ltd. of Japan has produced a moiré pattern. The line kind of wire mesh.