Common Quality Problems in UV Polishing

The common quality problems in UV polishing are:
1. After glazing, after a period of time, the printed materials will be yellowed, red, and change colors;
2. The printed surface is not bright; pleats or streaks appear;
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 effect of leveling;
3. Pay attention to the printing quality of the ink at the end 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. Correctly adjust the surface tension of the coating oil to make it less than the surface tension of the ink, and add a solvent or surfactant with a low surface tension;
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.

Reprinted from: Business Network