Why is random overprint not allowed?

This means that some parts of the image on the printing paper are not overprinted, and the other areas are very accurate, and the position of each sheet is not exactly the same. Occurs in embossed (embossed) and wrinkled paper. It may be helpful to reduce the pressure on the backing pressure roller. Unfortunately, the surface of the above-mentioned paper is uneven, and for a good printing effect, a large amount of press is often required. This problem is expected to achieve some improvement by first causing the printing paper to be imprinted once by the printing press without inking. It is not easy to achieve a very precise alignment for a rough surfaced printing sheet. When the edge of the paper begins to shrink, it is not easy to notice, but the disadvantages of random overprinting and ghosting may occur. In addition, when the paper is cut to a non-square shape and the direction of travel is inaccurate at the time of printing, overprinting is also not allowed. This problem can be achieved by first trying to take a few sheets of printing paper to print the first color on the printing machine, and then try the second and third color printing effects. It can quickly be seen whether there is a problem of overprinting. Random overprinting is not allowed for reasons related to the printing press: 1. The paper slipped at the claws; 2. The inappropriate height of the printing cylinder pad; 3. The rubber roller that was distorted; 4. Improper loading; The pressure in the pressure tube is too high.