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When the offset pressure is too high, the frictional force of the surface of the blanket on the surface of the printing plate will inevitably increase, causing the plateau surface to be worn and damaged, the hydrophilicity of the blank area will fluctuate, and the ink will easily adhere and be transferred to the printing product. This is a dirty version. In addition, the printing pressure is too large, the expansion and contraction deformation value of the blanket when the pressure is also large, the transfer of the imprint is also easy to produce deformation, especially the printing of dots and small text, there are often paste the ills. If you use the letterpress process to print small, negative, negative, negative layout, the performance of such situations is even more pronounced. Therefore, to prevent the occurrence of dirty and paste, it is necessary to accurately adjust the printing pressure, and to control the thickness of the liner and the center distance of the cylinder according to the specifications of the equipment.
The third part of the carton preprint quality problem
Third, the printing pressure caused by the dirty version and paste problems: