Compared with coated paper, offset paper has poor surface smoothness, poor penetration into the binder in the ink, and the ink tends to accumulate on the paper surface. Sometimes the ink surface has been oxidized and conjunctival, but it can not be completely dried.
Therefore, when printing the back side of offset paper, the printing ink on the front side is not completely dry, and the ink will dry on the impression cylinder during the back side printing. The pressure on the text is increasing, which eventually makes the front picture and text false and unrealistic. If you do not often sample and inspect during printing, a lot of waste products will be generated, causing unnecessary waste.
Solution
It takes a long time for the ink to dry completely before printing on the back, and daily production is impossible. Take the method of wiping the impression cylinder frequently, so that the accumulation of the ink layer on it is not too thick, reducing the impact on the front image and text, and can basically solve the problem. Generally, this problem will not occur below 3000 prints, and the more the number of prints, the more obvious. To avoid such problems, you must make more samples and check more.
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