Extrusion & Post
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MP film poor printing adhesion
Problem Phenomenon
after printing on MP film, ink adhesion < grade 2, large-area peeling in the cross-cut test
Cause Analysis
MP surface polarity poor affinity with ink; corona treatment effect decays fast; ink system mismatched with MP
Solution
1) print immediately within 24h after corona treatment; 2) use MP-specific ink; 3) increase corona power to 15-20kW/m² to ensure surface tension >42mN/m; 4) flame treatment to assist surface polarization
Key Takeaway
poor printing adhesion is caused by insufficient surface polarity; corona treatment and specific ink are key
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