Common offset ink failure analysis - overprint bad

The ink printed on the back during wet overprinting cannot be smoothly attached to the previously printed ink.
Reasons: (1) The viscosity of the ink after printing is too high compared to the ink printed before. (2) The first printing ink is slow and has a large amount of ink. (3) The color intensity balance of the four-color ink is not appropriate.

Processing methods: (1) Printing with high viscosity inks first and printing with low viscosity inks. The ideal stickiness requirements should be gradually reduced in the order of overprinting colors. (2) Fast and fast ink printing is used, and the high density is printed thinly. The pattern area is small and printed beforehand to facilitate the overprinting. (3) The color intensity of any set of wet multi-color overprint inks is balanced. When overprinting, the same amount of ink can be used. If not using the same set of inks together, it should be handled properly.