The main factors affecting the viscosity of solvent-based gravure printing ink are the following.
(1) Fix the viscosity of the resin solution. The resin viscosity is large, the ink viscosity is high, and vice versa.
(2) The matching of pigment and resin liquid. If a coagulative reaction occurs between the two, the viscosity of the ink system is high, otherwise it is low.
(3) Miscibility and compatibility of solvent and dispersion. If the solvent can dilute the dispersion in any proportion, the viscosity of the ink is low, and vice versa.
(4) Temperature. Low temperature, high ink viscosity, and vice versa.
If the viscosity of the solvent-based gravure printing ink is too low, it may cause pinholes in the printed product, or the large-area color block is not flat and smooth, and it may make the printed product false and appear halo. When printing a substrate with a smooth surface, the adhesion of the ink is low; when printing paper, it will appear powdering and dusting.
If the viscosity of the solvent-based gravure printing ink is too high, it will cause printing defects such as scratches, bite, paste, and "orange peel".
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