Processing Machinery
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LDPE Melt Temperature Range
Problem Phenomenon
LDPE melt temperature set to 250℃; the film shows yellow spots and abnormal odor.
Cause Analysis
Above 240℃, LDPE thermal oxidation accelerates, producing yellow spots and off-odor; During on-site troubleshooting, verify item by item according to this mechanism, and avoid blindly adjusting the machine based only on experience; This mechanism has been repeatedly verified by industry literature and should be confirmed first during troubleshooting.
Solution
Control melt temperature at 160-240℃; film takes 180-220℃; purge overheated material; After adjustment, continuously sample to verify the effect, and resume mass production only after confirming stability.
Key Takeaway
LDPE melt upper limit is 240℃; over-temperature causes oxidation; After confirming effectiveness, solidify the parameters and practices into the work instruction to prevent recurrence; Incorporate this case into the defect archive as a troubleshooting reference for similar future problems.
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