Extrusion & Post
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LDPE Film Corona Treatment
Problem Phenomenon
Poor printing adhesion and ink falling off of the film, and the effect of corona treatment decays over time
Cause Analysis
LDPE has low surface energy and requires corona treatment to reach 38 dynes or above before printing; slip agents migrating to the surface will cover the treatment effect; the longer the storage time after treatment, the more the decay
Solution
① Corona treatment to surface tension ≥38 dynes before printing; ② print as soon as possible after treatment; ③ note that decay accelerates for films with high slip agent content; after adjustment, take continuous samples to verify the effect, and resume mass production only after confirming stability
Key Takeaway
Corona treatment is the admission ticket for LDPE printing; the 38-dyne bottom line plus immediate printing prevents decay and failure; after confirming effectiveness, solidify the parameters and practices into the work instruction to prevent recurrence
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