Extrusion & Post
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EVOH film printing adhesion is poor
Problembeschreibung
After EVOH film printing, ink adhesion
Ursachenanalyse
EVOH surface polarity poorly compatible with ink; corona treatment effect decays quickly; ink system does not match EVOH
Lösung
1) Print immediately after corona treatment within 24h; 2) Use EVOH-specific ink; 3) Increase corona power to 15-20kW/m² to ensure surface tension >42mN/m; 4) Flame treatment to assist surface polarization
Wichtigste Erkenntnis
Poor printing adhesion is caused by insufficient surface polarity; corona treatment and special ink are key
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