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Generally can be resolved from the following aspects: 1, adjust the color ink dilution solvent ratio, reduce the color ink in contact with the front color ink on the color of the front of the dissolving ability, that is, in the diluted color ink, add Part of the isopropanol, minimize the use of toluene; 2, increase the speed of printing to improve the printing speed can significantly reduce the contact time of the color ink and the front color ink, which is particularly obvious at low speed printing reverse printing, and in high-speed printing There is basically no reason for reverse printing. This point in the actual printing may be limited by the printing equipment and the printing environment; 3, adjust the formula composition of the printing ink can be used to improve the adhesion of the front color ink on the BOPP film, so that the two layers of ink contact, before The color ink is still attached to the BOPP film. In the ink of the CLPP system, the CLPP content can generally be increased to solve the problem. Secondly, the drying speed of the ink of the preceding color can be increased, the temperature of the drying path of the ink of the preceding color can be increased, and the presence of a small amount of non-volatile solvent in the ink ink film can be prevented.
Anti-envelope printing is particularly noticeable at low to medium speeds. The phenomenon of reverse printing at high speeds is greatly reduced. The key to solving the problem of reverse printing is to analyze the reasons for clear printing. In reverse printing, the ink is generally printed before the ink is reversed. On the printing plate of the ink, it enters the ink tank of the posterior color, changes the color of the ink of the latter color, finally causes the printing to be unable to continue, if the yellow ink gradually turns into the light green color, the red ink turns into the purple color gradually.