Processing Machinery
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PP Discoloration Yellowing
Problem Phenomenon
【Problem Phenomenon】PP products yellow and hue drifts
Cause Analysis
Excessive melt temperature and long residence cause oxidative degradation; regrind ratio fluctuation; color masterbatch has insufficient temperature resistance; during on-site troubleshooting, verify item by item according to this mechanism to avoid blindly adjusting the machine based only on experience
Solution
Measure actual melt temperature and shorten residence; fix regrind; temperature-resistant color masterbatch; 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 to facilitate locating effective measures
Key Takeaway
For PP yellowing check heat history, oxidative degradation is the root; after confirming effectiveness, fix 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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