Extrusion & Post
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Poor printing adhesion of EVA film
Problem Phenomenon
After printing EVA film, ink adhesion <2 grade with large-area peeling in cross-cut test
Cause Analysis
EVA surface polarity has poor affinity with ink; corona treatment effect decays fast; ink system not matching EVA
Solution
1) Print immediately after corona treatment within 24h; 2) Use EVA dedicated 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 dedicated ink are key
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