Extrusion & Post
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LLDPE melt temperature range
Problem Phenomenon
LLDPE blown film melt temperature set to 270℃, the film yellows with gel.
Cause Analysis
Above 260℃, LLDPE thermal oxidation accelerates, producing gel and yellowing; During on-site troubleshooting, verify item by item according to this mechanism, avoiding blindly adjusting the machine based only on experience; This mechanism has been repeatedly verified by industry data and should be confirmed first during troubleshooting.
Solution
Control melt temperature at 200-260℃; blown film takes 195-215℃; empty overheated material; After adjustment, continuously sample to verify the effect, and resume mass production only after confirming stability.
Key Takeaway
LLDPE melt upper limit 260℃; blown film prefers medium-low temperature; After confirming effectiveness, fix the parameters and practices into the work instruction to prevent recurrence; include this case in the defect archive as a reference for troubleshooting similar problems in the future.
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