Performance Phenomenon: The cured coating is not mirror-like.
Reason 1: The viscosity is too high a few days before the UV light, and the leveling is poor
Solution: Reduce the viscosity of UV varnish and add a small amount of leveling agent.
Reason 2: The coating roller is too thick and not smooth
Solution: The surface of the coating roller should be ground and polished.
The printing coating rubber roller should have the following characteristics:
(1) The rubber hardness is between 50 ~ 60, with good resilience;
(2) Good transfer and inking performance with ink;
(3) It has certain abrasion resistance.
Reason 3: The pressure is too small and uneven
Solution: Adjust the pressure.
Reason 4: Too much coating amount
Solution: reduce the amount of coating.
Reason 5: The UV coating is not cured, pressed by other guide rollers and reversed
Solution:
(1) Clean.
(2) Identify the cause of uncuring.
Reason 6: Due to the low temperature, the glazing oil is relatively easy to solidify, which is not conducive to the normal flow of the glazing oil, resulting in uneven oil film on the surface of the glazed product.
Solution: Under normal circumstances, the temperature of the glazing of the printed matter can be controlled at about 20 to obtain a more ideal effect.
Pay attention to when using varnish:
(1) Understand the types, properties, effects and changes of varnishes when they are formulated with other solvents.
(2) The varnish with suitable performance should be selected according to the substrate and ink surface performance of the substrate.
(3) Pay attention to the drying performance of the varnish. Does the drying temperature range and drying time affect the substrate?
(4) It is necessary to consider the adaptability of the post-processing of the glazing material, such as hot stamping performance, durable friction, pressure resistance during die cutting of concave and convex indentation, etc.
(5) Varnish with high transparency and low odor should be selected.
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