Removal of the PS version of the horseshoe print
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In the offset printing work, it is often encountered that the PS version, especially the regenerated PS version, is not flat enough, and has a horseshoe-shaped convex and concave impression, which seriously affects the quality of the offset printing plate. In places where there are horseshoe prints. Because the PS film's photosensitive film and the paper, line, and dot film of sulfuric acid paper or film can't be closely combined, there is a certain gap, which is easy to cause the text, lines, and dots to be false. The PS version cannot be printed on the machine. The phenomenon.
1. Reasons and solutions for the formation of horseshoe print marks
The PS version that we often use in offset printing and printing work can be roughly divided into two types. One is to print the high-grade fine packaging and decoration, the trademark, and the original PS version used in the four-color overprint color cover. The price of this plate is high and the quality. Well, the surface is relatively flat; the second is to reproduce the PS version of low-grade books, forms, miscellaneous pieces. The price of this type of plate is low and the quality is unstable. The surface of the recycled PS plate is not smooth and smooth, and there are many horseshoe print marks.
Because the l PS version has undergone many original PS version regeneration. In the process of regeneration, disassembly, cleaning, grinding, electrolytic corrosion, coating and regeneration of PS plate photosensitive film, drying and other processes, PS plate only has a thickness of about 0.4mm, such as the PS plate size is large, the plate is Thin, PS version in the process of regeneration is often due to repeated regeneration, the operation of the regenerated PS version has a horseshoe print. The PS version is best stored in the same way as the glassware during transportation. Careful loading and unloading will reduce the horseshoe print marks.
In addition, the operator of the PS version should have a sense of responsibility and careful work attitude. When taking out the PS version from the box, take it lightly. When you find the horseshoe print on the PS version, you can use a small bamboo board from the PS. Poke up on the back of the plate. If possible, press on the platform to make the PS plate as flat as possible.
2, adjust the selenium machine vacuum pump
When we encounter the unevenness of the horseshoe print on the PS version in actual work, we should re-adjust the pressure of the vacuum pump before the plate is pressed to increase the pressure when vacuuming. Extend the inspiratory time before the PS version is exposed, let the vacuum pump pump up and suck the foot so that the PS version of the photosensitive film surface and the text, dots and lines on the sulfuric acid paper or film can be closely fitted, and the PS version is clear. , smooth, the idea is not falsified, to achieve the quality requirements of offset printing.