UV curing waterborne glazing common failures?
Time:2016-04-17 14:08Source:sankunClick: Number
UV curing waterborne glazing common failures?
1. Drying is not good, the surface sticky: the main reason is
A. coating thickness;
B. oil polish PH value is too high
C. glazing oil viscosity is too high;
D. baking temperature and hot air is insufficient;
The solution is: appropriate adjustment with ethanol glazing oil viscosity and PH value, reduce the amount of coating, strengthen the drying system.
2. The luster and brightness, is the main reason
A. paper is too thick, high penetrability;
B. liquid coating is too thin, solid content;
C. quality of waterborne glazing oil;
The solution is to improve the glazing oil viscosity and the coating weight, the bottom glue is required for a paper is too thick.
3. The light oil and gas bubble: the main reason is
A. glazing oil viscosity is too high;
B. glazing oil PH is low;
C. defoaming agent to join shortage;
The solution is: add ink appropriate stabilizers, keep gloss oil viscosity in the 30 s, keep the PH value at 8.5 ~ 9.5, adding suitable amount of defoaming agent when necessary, but not more than 1%.
4. The surface coating unevenness, have stripes or orange peel phenomenon: the main reason is
A. glazing oil viscosity is too high;
B. large amount of coating;
C. scraper and pressure adjustment is not appropriate;
D. poor glazing oil flow flat;
E. dry too fast;
The solution is: reduce oil viscosity, reduce the amount of coating, appropriate to add ink blockers, reduce the drying speed, or add a small amount of smoothing agent.
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