In the entire offset printing process, it is the process of resolving the contradiction between ink and paper. To successfully transfer the icon coated with ink on the printing plate to the printed paper, it must be applied during the image transfer process. Printing pressure.
It is often said that "without pressure there is no printing" This sentence fully illustrates the importance of printing pressure. Since the printing pressure is so important, is this pressure the greater the better? Of course not. Generally speaking, the appropriateness of printing pressure is often expressed by the printing quality of the printed matter. The printing pressure should be based on the premise that the printed product has strong dots, clear graphics, bright colors and shades; and the smaller the application, the better.
When the printing pressure is too small, it will cause:
1. The transfer of printed graphics is not complete;
2. The outlet is not strong and the color is gray;
3. The imprint is not firmly fixed, the pictures are fuzzy, the dots are not real, and the color is gray.
4. Make the original defects and defects such as printing plate, packing lining, paper and printing machine more obvious.
Therefore, the ideal printing pressure should be: under the condition of a certain printing surface deformation, the minimum pressure is used uniformly on the basis that the print is sufficiently strong. Printing pressure is suitable for imprinting and fixing to be firm. If the printing pressure is too high or too small, it is not conducive to the printing quality, and it is extremely harmful to the correct transfer of the print.
Ideal pressure is not a fixed concept, but under the premise of conducive to product quality, it can shake various objective printing conditions, properly adjust and adapt to it. Left and right, and the pressure between the cylinder and the rubber cylinder is greater than the pressure between the plate cylinder and the rubber cylinder by about 0.5mm ~ 0.10mm.
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