During the gravure printing process, the ink layer or varnished surface of the printed product appears like fountain or crater-like raised spots, sometimes the entire pattern is present. Aiming at the shrinkage phenomenon in the gravure printing process, this article analyzes its causes and solutions in detail.
Failure phenomenon
Protruding spots like fountains or craters appear on the ink layer or varnished surface of the printed product, and sometimes the entire pattern is present. The printing surface is rough and the gloss is reduced.
Cause Analysis
The surface of the ink dries too quickly. The heat first strongly acts on the surface to form a dry film. The solvent in the lower layer is temporarily sealed. When it continues to be heated, the solvent inside will escape to the outside. When the energy reaches the level of breaking through the surface film, it will be ejected, thereby forming shrinkage cavities.
Solution
1. Appropriately add leveling agent to printing ink;
2. Use solvents with low surface tension;
3. Wetting the surface of the substrate;
4. Control the temperature and humidity of the printing environment;
5. Choose a suitable interpreter;
6. Reduce the surface tension between the printing ink and the printing carrier, so that the ink and the carrier have good wettability, so that it will not form a surface tension gradient with the substance that causes shrinkage;
7. Adjust the solvent evaporation speed, reduce the viscosity, improve the fluidity of the ink, and extend the leveling time.
As a well-known supplier and manufacturer of gravure printing machines at home and abroad, Danis knows a lot about gravure printing. If you have any questions about the solution to the shrinkage phenomenon in the gravure printing process, please contact us.
Tag: shrinkage phenomenon, gravure printing process
tony
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