The use of UV printers are becoming more and more popular.The UV process needs a high-end output feeling, it must be inseparable from the treatment of varnish. However, sometimes during the printing process, varnish will also have printing problems. So what are the main problems? How to solve it?

5. Varnish becomes very thick, with gel phenomenon
If this happens, it is generally because the varnish is not stored properly, such as not being protected from light or expired, or because the storage temperature is not appropriate.
Solution: The varnish must be stored properly, and must be stored away from light, the storage temperature is generally 20-25 ℃.

6. Printing defects such as holes or white spots on the varnish
This is usually caused by dust on the surface of the media, or the varnish layer is too thin, or too much non-reactive diluent such as ethanol is added.
Solution: Keep the surface of the media clean and the thickness of the varnish layer should not be too thin.

7. The surface of the varnish is uneven and has streaks
This situation is also very common in UV printing, mainly because the viscosity of the varnish is too high, the flowability is relatively poor, or because the amount of varnish applied is too large.
Solution: reduce the viscosity of varnish, don't be so sticky; and reduce the amount of smear.

8. The gloss of varnish is not good
This is because the varnish layer is too thin or uneven, or because of excessive dilution of non-reactive solvents such as ethanol.
Solution: According to the different conditions of the substrate, increase the thickness of the varnish appropriately and reduce the dilution of non-reactive solvents.