Extrusion & Post
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CEF film printing adhesion poor
Problem Phenomenon
After printing on the CEF film, the ink adhesion is <2 grade, and large areas fall off in the cross-cut test
Cause Analysis
The polarity of the CEF surface has poor affinity with the ink; the corona treatment effect decays quickly; the ink system does not match CEF
Solution
1) Print immediately after corona treatment, within 24h; 2) Use CEF special ink; 3) Increase the corona power to 15-20kW/m² to ensure the 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 special ink are the key
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