Material Drying
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Static Electricity and Poor Print Adhesion of PE Film
Problembeschreibung
The film roll has high static electricity, attracts dust, and sparks during machine operation; after printing, ink adhesion is poor and ink falls off.
Ursachenanalyse
PE has strong insulation and frictional charge is difficult to release, and a dry environment aggravates static electricity; PE has low surface energy and slip agent exudation further reduces surface energy, while insufficient corona treatment or excessive aging time after treatment leads to poor adhesion.
Lösung
①Install static eliminators and ground the equipment, increase ambient humidity; ②Strengthen corona treatment before printing and test the dyne value; ③Print promptly after corona treatment to shorten the aging time; ④Evaluate slip agent exudation and apply primer coating if necessary; ⑤Select a low-exudation system for printing film.
Wichtigste Erkenntnis
Static electricity of PE film relies on 'elimination + grounding + humidification', and print adhesion relies on 'dyne value + aging time'; corona treatment decays over time, and printing as soon as possible after treatment is an iron rule of the industry.
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