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