9. Overprint fault
Overlapping ink film is called overprinting. In the case of multi-color printing, ink printed on the previous ink cannot be clearly printed on the ink film of the previous printing. This phenomenon is easily caused by some kinds of ink, and some are not easily produced. For example, an oxidative polymerization type ink has a large amount of desiccant added to promote drying, and when the ink film is oxidized and hardened excessively, two colors of ink repel each other. In addition, if an antifoaming agent is added in excess to the volatile ink, the antifoaming agent forms a film on the surface of the ink film, preventing the overprinting. The remedy is to use inks with good overprint properties to reduce the viscosity of the ink, add additives to the ink, and reduce the drying speed of the ink.
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