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Matters needing attention when UV varnish on the label
time:
2018/05/10
Source:
Guangzhou Guangcai Label Co., Ltd.
UV varnish is unevenly coated when printing self-adhesive labels, and the cured coating will not be a mirror surface.
1. labels should be noted when using varnish:
1. understand the types, properties, effects and changes in the preparation of varnish with other solvents.
2. select varnish with suitable performance according to the substrate and ink surface properties of the printing substrate.
3. pay attention to the drying performance of varnish, and whether its drying temperature range and drying time have any influence on the substrate.
4. consider the post-processing adaptability of glazing materials, such as hot stamping performance, durable friction, pressure resistance during concave and convex indentation die cutting, etc.
5. varnish with high transparency and low odor should be selected.

reason 1: UV light a few days before the viscosity is too high, poor leveling.
solution: reduce the viscosity of UV varnish and add a small amount of leveling agent.
2 reason: coating roller is too rough and not smooth.
Solution: The surface of the coating roller should be ground and polished.
2. label printing coating roller should have the following characteristics:
1, rubber hardness between 50~60, with good resilience;
2, and ink has good transfer and inking performance;
3, has a certain abrasion resistance & nbsp;

Cause 1: The pressure is too small and uneven
Solution: Adjust the pressure.
2 reason: too much coating.
solution: reduce the amount of coating.
reason 3: due to the low temperature, the varnish is easy to solidify, which is not conducive to the normal flow of the varnish, resulting in uneven oil film on the surface of the product after polishing.
Solution: Under normal circumstances, the temperature of the label on the light can be controlled at about 20 to achieve ideal results.
4 reason: UV coating is not cured, by other guide roller pressure and anti-stick.
solution:
1, clean.
2. find out the cause of uncured.
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