Processing Machinery
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HDPE Yellowing
Problem Phenomenon
HDPE product color turns yellow
Cause Analysis
Thermal oxidative degradation or excessive processing temperature; during on-site troubleshooting, verify item by item according to this mechanism to avoid blindly adjusting the machine based solely on experience; this mechanism has been repeatedly verified by industry data and should be confirmed first during troubleshooting
Solution
Control melt temperature upper limit; manage residence; confirm antioxidant system; after adjustment, continuously sample to verify the effect, and resume mass production only after confirming stability; change only one variable at a time and record parameter changes to facilitate locating effective measures
Key Takeaway
For yellowing, check temperature, residence, and 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 reference for troubleshooting similar problems in the future
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