The effect of paper smoothness on the table tour

There are many factors that affect the card. The smoothness of the paper is also an important reason. So what impact does smoothness do?

By the small tape with everyone to understand about:

Smoothness of the poor printing of paper when the amount of ink absorption, easy to cause the color of ink, layout graphic layer of poor, imprint drying speed, printing plate wear fast and so on. Printing companies can not change the smoothness of the paper, but for the smoothness of the paper, printing companies can be improved through the process to improve. The specific method is as follows:

One is appropriate to increase the printing pressure to compensate for the rough contact with the paper when the bad impression of the ink produced by the situation; the second is the use of "light ink thick" printing process, the ink will be appropriate to lighter tone, Appropriate to increase the amount of ink, both to make the printing hue meet the requirements, but also make the ink ink full color; Third, before the official printing of a layer of varnish, to improve the paper surface conditions.

However, some of the quality problems that arise in actual production seem to be due to poor paper smoothness, but that may not be the case. Here are two examples.

The first two years, once someone took two printed samples came to us, the two samples using the same amount of coated paper (only the manufacturer is different), the same equipment printing, and printed with the same job (four Mesh image), the results of a printed ink to the hair, the other is good results. At that time we decided that the printing effect is not good paper smoothness is not good, but he said that the measurement of the smoothness of these two kinds of paper, poor printing effect of paper smoothness slightly higher. Later, after repeated thinking, we suspect that the problem lies in the printing surface roughness (PPS), that is, under the pressure of the paper under the elastic deformation of the flatness, offset only when the paper PPS ≤ 2μm, enough to ensure that the transfer to the paper The thickness of the ink film is uniform. Therefore, we analyze, although the printing effect is not good paper smoothness, but its surface roughness PPS higher, under the action of the elastic deformation capacity under pressure as another paper, transferred to the ink layer on its uniformity difference.