Main reasons: UV varnish viscosity is too high; Pressure size is not uniform; Coating quantity is too large; The leveling of UV varnish is poor; Paper is not smooth, absorption is too strong; UV varnish has poor surface peaceability.

Solution: reduce UV varnish viscosity; Reduce the amount of coating, ah secretly adjust evenly; Can add a small amount of leveling agent; The printed surface is corona treated to increase the affinity of UV varnish to the surface.