Extrusion & Post
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LLDPE film uneven thickness
Problem Phenomenon
Large transverse thickness deviation of the film, tight and loose edges in winding.
Cause Analysis
LLDPE melt is more sensitive to die gap and temperature; uneven gap and uneven air ring cooling are amplified into thickness differences.; During on-site troubleshooting, verify item by item according to this mechanism, avoiding blindly adjusting the machine based only on experience.
Solution
①Fine-tune the die gap; ②balance air ring output; ③stabilize the bubble; ④automatic thickness measurement closed-loop adjustment.; After adjustment, continuously sample to verify the effect, and resume mass production only after confirming stability.
Key Takeaway
LLDPE requires higher thickness control precision; automatic thickness measurement adjustment can compensate for material sensitivity.; After confirming effectiveness, fix the parameters and practices into the work instruction to prevent recurrence.
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