Extrusion & Post
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LLDPE film winding hardness
Problem Phenomenon
Film roll too soft and collapsing or too hard with chrysanthemum pattern.
Cause Analysis
LLDPE film stiffness characteristics make the winding tension window different from LDPE; tension and taper need recalibration.; During on-site troubleshooting, verify item by item according to this mechanism, avoiding blindly adjusting the machine based only on experience.
Solution
①Set the tension curve according to LLDPE characteristics; ②optimize taper parameters; ③check core quality; ④verify roll hardness.; After adjustment, continuously sample to verify the effect, and resume mass production only after confirming stability.
Key Takeaway
Winding parameters should be adjusted with material characteristics; directly continuing LDPE parameters easily causes problems.; After confirming effectiveness, fix the parameters and practices into the work instruction to prevent recurrence.
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