Nine, UV coating coating yellow
1, the phenomenon of failure
1UV Varnish raw material is impure and its color is dark.
2 Photoinitiator used in varnish has yellowing phenomenon.
3UV Varnish is stored for a long time and darkens.
4 Strong light source, long curing time, excessive exposure to ultraviolet light.
2, elimination method
1Selection of transparent and colorless UV varnish.
2 Avoid using photoinitiators that cause yellowing discoloration.
3 Adjust the speed of the light source to avoid overexposure.
4 If necessary, add a small amount of brightener.
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