The important relationship between printing pressure and printing quality
The quality of the product is good or bad, and there are many links involved. From a large perspective, there are two links before and after printing. Under the premise of fully grasping the quality of pre-printing (entry, proofreading, typesetting, film production, photocopying, etc.), the reasonable adjustment of printing pressure in the post-press process is also crucial.
We all know that printing is ultimately accomplished by pressure. Due to the principle of incompatibility between ink and ink, the text pattern on the PS plate is imprinted on the paper through a certain pressure between the plate cylinder and the impression cylinder. The pressure in printing directly affects the quality of the printed matter. This article explains some of the problems encountered in the work, different pressures have different responses to printed products.
Commonly used printing presses can be divided into three types: round flattening, round flattening, and flat flattening. There is a rubber cylinder between the plate cylinder and the platen cylinder. There are also two types of flat rubber machines: "rubber pressing rubber" (also known as "BB machine") and "rubber pressing roller".
The company uses more "rubber-pressed roller" machines. Based on years of experience, the printing pressure is slightly larger than the permitted range by 2 wires, and the effect is better. But the BB machine cannot do this. If the upper set of the BB machine has more than 2-3 filaments and the lower set has less than 2-3 filaments, the ink color of the upper set will be too heavy, and the ink color of the lower set will be too light, and the printing is not true, and The rubber of the rubber roller under the BB machine is very rare to remove. At the beginning, we thought that the rubber was not pressed, and we did not expect the pressure of the rubber to go up.
For a period of time, the book was printed with false dots, false spots, and heavy ink on the ground. I thought of many methods and did not solve the problem. Later, I invited the production backbone of the rubber wheel and used the adjustment method of the rubber offset printing machine at the same time. Adjust the pressure of the upper and lower 4 rollers of the BB machine, change the pad of the PS version of the roller from the paper liner to the film liner, adjust the pressure of the upper and lower rubber rollers to be consistent, and finally solve the problem satisfactorily, the product quality is produced Recognized by Section and Quality Section.
This matter shows that the pressure of the printing machine is different, so you have to use different methods to adjust it. From this point of view, as a machine worker, you should always pay attention to learning printing theory, and you must use your brains and think more about the problems encountered in your work. Only in this way can you master the evolving printing technology.
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