Extrusion & Post
3 Aufrufe
LLDPE film uneven thickness
Problembeschreibung
Large transverse thickness deviation of the film, tight and loose edges in winding.
Ursachenanalyse
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.
Lösung
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.
Wichtigste Erkenntnis
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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