Processing Machinery
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PP Color Difference Between Batches
Problem Phenomenon
【Problem Phenomenon】Color difference between batches of PP colored parts
Cause Analysis
Heat history differences, color masterbatch dispersion, regrind fluctuations; PP crystallinity also affects hue; during on-site troubleshooting, verify item by item according to this mechanism to 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
Lock temperature and residence; precise color masterbatch metering; fixed regrind; uniform crystallization; 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
PP color difference controls heat history and color masterbatch, uniform crystallization is also important; 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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