The relationship between printing pressure and print quality
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The quality of the products is good or bad, and there are many links involved. From the big aspects, there are two major links: pre-press and post-press. Under the premise of fully grasping the quality of pre-press (entry, proofreading, typesetting, filming, printing, etc.), the reasonable adjustment of printing pressure in the post-press process is also crucial. We all know that printing is ultimately done by pressure. Through the pressure between the plate cylinder and the impression cylinder, the text pattern on the PS plate is imprinted onto the paper due to the principle of ink incompatibility. The pressure in printing directly affects the quality of the printed product. Some of the problems encountered in the work today illustrate the different responses of different pressures to the printed products.
Commonly used printing presses, different printing methods, can be divided into three types: round flattening, round pressing, and flat pressing. There is also a blanket cylinder between the plate cylinder and the impression cylinder. Flat rubber machines also have two types of presses: “rubber press rubber” (also known as “BB machine”) and “rubber press roller”.
The company uses more "rubber pressure roller" machine. According to years of experience, the printing pressure is slightly larger than 2 inches in the permitted range, and the effect is better. But the BB machine can't do this. If the upper set of the BB machine is more than 2-3 filaments, and the lower set is 2-3 filaments less, the upper set of ink will be overweight, and the lower set of ink is too light, and the print is not true. The squeegee rubber of the BB machine is very difficult to remove. At the beginning, we thought it was the next set of rubber without pressure, and did not think of the pressure of the next set. The book that was printed for a while, the outlets were not real, the imaginary, the place on the ground was too heavy, and I thought that many methods did not solve the problem. Later, the production backbone of the rubber wheel was invited, and the adjustment method of the wheel press was simultaneously Adjust the pressure of the upper and lower 4 rollers of the BB machine, change the padding of the PS plate roller from the paper pad lining to the film lining, adjust the lining pressure of the upper and lower rubber rollers to the same, finally solve the problem satisfactorily, and the product quality is produced. Recognition of the Section and Quality Section.
It shows that the pressure method of the printing press is different, and it has to be adjusted in different ways. Thinking about this matter, as a machine worker, you should pay attention to learning the theory of printing theory. You should use your brains and think more about the problems encountered in your work. Only in this way can you master the ever-changing printing technology.