Extrusion & Post
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LDPE Film Printing Ink Adhesion
Problem Phenomenon
Printing ink adhesion is poor, and color comes off after rubbing.
Cause Analysis
Insufficient surface energy or inadequate corona treatment; slip agent migration on the film surface also hinders ink wetting.; During on-site troubleshooting, verify item by item according to this mechanism, and avoid blindly adjusting the machine based only on experience.
Solution
①Increase corona treatment intensity; ②Control slip agent dosage; ③Test dyne value before printing; ④Select matching ink.; After adjustment, continuously sample to verify the effect, and resume mass production only after confirming stability.
Key Takeaway
Printing quality starts with surface energy management; dyne value testing is the basis for release.; After confirming effectiveness, solidify the parameters and practices into the work instruction to prevent recurrence; Incorporate this case into the defect archive as a troubleshooting reference for similar future problems.
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