Extrusion & Post
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Poor Printing Adhesion of LDPE Film
Problem Phenomenon
Printing ink adhesion is poor and ink falls off.
Cause Analysis
LDPE surface energy is low and slip agent blooming further reduces surface energy; corona treatment is insufficient or the aging after treatment is too long.
Solution
①Strengthen corona treatment and test dyne value; ②print promptly after treatment; ③evaluate slip agent blooming; ④primer treatment if necessary.
Key Takeaway
Printing adhesion = dyne value + aging.
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