Discussion on Common Quality Problems in Self-adhesive Label UV Polishing

The common quality problems in sticker UV coating are:

1. After glazing, after a period of time, the prints will turn yellow and red and change color;

2, D brush surface is not bright; pleated or streak;

3. The glossy surface is sticky and not smooth;

4, the glazing layer is not strong, out of ink, there are bubbles, pits and so on.

The solution to the problem is:

1. Use high-quality, effective period of coating oil;

2. Reasonably control the amount of varnish, neither too little nor too much, should pay attention to the leveling effect;

3. Pay attention to the printing quality of the bottom ink and require that the amount of ink be printed and printed, and do not dry it;

4. Correctly adjust the viscosity of coating oil according to the actual condition of the coating surface;

5, the correct adjustment of the surface tension of the coating oil, so that it is less than the surface tension of the ink, you can add a low surface tension solvent or surfactant;

6, to avoid the ink layer crystallization, if necessary, it can be surface treatment;

7, adjust the speed of the machine, the amount of varnish, drying energy relationship.

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