Extrusion & Post
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LLDPE film pinholes
Problem Phenomenon
Tiny pinholes appear on the film surface, becoming barrier defects after lamination.
Cause Analysis
Gel rupture, bubbles, or impurity points form pinholes under high stretching; LLDPE high draw ratio applications expose them more easily.; During on-site troubleshooting, verify item by item according to this mechanism, avoiding blindly adjusting the machine based only on experience.
Solution
①Strengthen filtration to reduce gel; ②control raw '2079851475616104451; ③visual inspection positioning; ④optimize the stretching process.; After adjustment, continuously sample to verify the effect, and resume mass production only after confirming stability.
Key Takeaway
Pinholes are a quality red line for high-stretch film; source cleanliness and filtration are key.; After confirming effectiveness, fix the parameters and practices into the work instruction to prevent recurrence.
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