How to solve the problem of ink crystallization in printing?
Time:2025-12-25
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A substance whose solubility does not decrease significantly with decreasing temperature, but crystallizes after partial solvent evaporation and subsequent cooling. Some people believe that the crystallization of packaging printing graphics (ink film layer) is called recrystallization, which is formed by the evaporation (volatilization) of the solvent in the printing ink film system and then cooling, also known as recrystallization. How to solve the problem of ink crystallization?
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The methods for preventing ink crystallization faults are introduced as follows:
1. Cover printing with fast drying ink containing a large amount of solvent (printing the second color before it dries completely, although the effect is good, this method is labor-intensive, material intensive, and costly), and the solvent used can penetrate and soften the underlying ink film layer (but sometimes it is useless).
2. Master the printing time and print the second color as quickly as possible after printing the previous color.
3. Add some slow drying aids (such as hydroquinone) or slow drying materials (Vaseline, lanolin, wax additives) to the ink to delay drying.
4. Different base colors that are easy to overlay can be used in the pattern design of packaging printing and decoration.
5. Cobalt based desiccants should be used sparingly in ink formulations.
6. Synthetic resin based binders with fast drying can be used to reduce the amount of desiccant used in ink.
7. The purpose of enhancing the adhesion of the second color ink is to destroy the already crystallized ink film. If zero ink or alkyd resin, epoxy resin, and polyamide resin are used, they are materials with high adhesion. Adding them to the ink can enhance their adhesion, but these resins have poor miscibility with offset printing ink and cannot be added too much. Excessive addition often dilutes the color of the printing ink, while insufficient addition will not have a good effect.
8. Add organic solvents to the printing ink to dissolve the crystallized ink film layer. This is one of the commonly used methods by printing operators, but the crystallized ink film layer has become a smooth ink film layer with a main network structure that is not easily dissolved, and the effect is not good when it is too much.
9. Adding alkali or soap to printing ink to enhance polarity makes it easier to print, but although it appears to be printed at the time, it does not adhere firmly and is easily erased after drying.
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