For the puzzle books printing wholesale, I believe everyone is no stranger, but for the printing shrinkage phenomenon may not be known. So what are the reasons for the shrinkage phenomenon in the puzzle books printing wholesale?

Shrinkage hole is one of the faults of printing ink film due to poor leveling. After printing ink, wet ink shrinks into a small round bare substrate material or an ink layer during the leveling process. The main reason for shrinkage is that the surface capacity of the upper and lower parts of the printed wet ink film is different. A wet ink film can be regarded as a double layer of liquid ink film. In the film forming process, when the surface tension of the upper wet ink film is lower than the surface capacity of the lower wet ink film, shrinkage occurs. Sometimes when this phenomenon is about to occur, the wet ink film has fluidity, which may cause secondary shrinkage holes.

Theoretically speaking, the remedy is to improve the flow and flatness of wet ink, the surface tension of the printing ink should not only be low, but also the wettability of the substrate material is better, because the interface ability of the upper wet ink film and the following wet ink film is poor, after printing, the surface tension of the system decreases, so that the printing ink will develop a complete ink film from itself, resulting in shrinkage hole failure.

Specific practices are as follows:

1, in the printing ink appropriate to add leveling agent;

2, the use of low surface tension solvent;

3. Wet the surface of the substrate;

4, control printing operation environment temperature and humidity;

5, choose the appropriate diluent;

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 between the substance causing shrinkage.

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