Processing Machinery
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LDPE Yellowing
Problem Phenomenon
LDPE products turn yellow
Cause Analysis
Thermal oxidation or insufficient antioxidant system; when troubleshooting on site, 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 data and should be confirmed first during troubleshooting
Solution
Control temperature residence; confirm the antioxidant system; raw material freshness; after adjustment, take continuous samples to verify the effect, and resume mass production only after confirming stability; change only one variable at a time and record parameter changes, so as to locate the effective measure
Key Takeaway
For yellowing check temperature and the antioxidant system; after confirming effectiveness, solidify the parameters and practices into the work instruction to prevent recurrence; include this case in the defect archive as a troubleshooting reference for similar problems in the future
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