Effect of Printing Speed ​​on Printing Pressure in Offset Printing

To make the printing plate coated with ink graphics can be clearly transferred to the surface of the substrate. Must have enough printing pressure. However, the applied printing pressure should not be too large. Excessive printing pressure will cause the printing material to continue to deform, the prints become thicker, and the dots will be graded and pasted, which will affect the clarity of the graphic and text, and at the same time it will aggravate the wear of the printing plate. The plate's resistance to printing forces has decreased. When the printing pressure is insufficient, there is no sufficient reliable contact between the printing plate and the blanket, and the imprinting will be shallow, affecting the clarity of the graphic and text.

As the printing speed increases, the blotting ink becomes lighter. At first, it was thought that the printing speed increased and the printing pressure decreased. This was not the case. Because when the printing speed increases, the imprinting time decreases, and the pressure time on the print surface decreases, the amount of ink transferred to the surface of the substrate also decreases, and the density decreases. As a result, the blotting ink becomes lighter. In actual production, in order to compensate for this defect, a method of increasing the printing pressure is often used.

In addition, in the case of the same footprint, the printing speed is directly related to the size of the impression cylinder of the printing press. In order to obtain a print of the same print quality, the printing speed of a large press of an impression cylinder must be slower than the printing speed of a printing press of a smaller size of an impression cylinder.