How to control the back of the printing is dirty

Dirty prints are a common failure in color printing. The occurrence of such failures will inevitably affect the printing quality, and it will result in the mass scrapping of products, which will bring great losses to the company. There are many reasons that cause the prints to become dirty, such as a thicker layer of printing ink, a too smooth back of the paper, improper ink transfer, and unsatisfactory printing pressure. The reason for the dirty nature of both inks is related to the temperature and humidity of the environment. Only by carefully putting a good technology in order to ensure the quality of the product's printing.

1. Correctly understand the relationship between printing pressure and ink thickness
Appropriate printing pressure is an important condition for uniform transfer of the layout ink layer. Insufficient or uneven layout pressure will affect the uniform transfer of the ink layer. When the printing pressure is insufficient or uneven during printing, the printing ink will be colored, and the ink thickness of the entire layout is also inconsistent. Increasing the ink volume can indeed make up for the defects caused by the poor contact between the ink layer and the substrate caused by insufficient printing pressure, but it is also likely to cause the ink to be dirty. Therefore, it is necessary to adjust the printing pressure first, and then adjust the layout of the ink, so as to get a good printing effect.

When printing coated paper, because the surface of the paper is relatively smooth, if the paper is creased, the paper will easily rub against the prints and become dirty. Therefore, knocking on paper should be dictated by the structure of the layout and the characteristics of the paper. For thicker coated paper, do not knock as much as possible, only use the method of rubbing or kneading, rub the paper straight and firm.

In summary, there are many reasons for causing the printed prints to become dirty, as long as we are technically good, we can not only get a better anti-sticking effect, but also improve the quality and productivity of printed products. .

Source: Management Consulting Network