Extrusion & Post
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Poor printing adhesion of PU film
Problem Phenomenon
After PU film printing, ink adhesion < grade 2, large-area peeling in cross-cut test
Cause Analysis
PU surface polarity has poor affinity with ink; corona treatment effect decays fast; ink system does not match PU
Solution
1) Print immediately after corona treatment within 24h; 2) Use PU-specific ink; 3) Increase corona power to 15-20kW/m² to ensure surface tension >42mN/m; 4) Flame treatment to assist polarizing the surface
Key Takeaway
Poor printing adhesion is caused by insufficient surface polarity; corona treatment and special ink are key
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