Processing Machinery
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LLDPE Yellowing
Problem Phenomenon
LLDPE products turn yellow
Cause Analysis
Thermal oxidation or insufficient antioxidant; 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
Temperature and residence control; antioxidant system confirmation; 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 and antioxidant; 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 subsequent similar problems
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