Processing Machinery
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PPO Batch-to-Batch Color Difference
Problem Phenomenon
[Problem Phenomenon] Batch-to-batch color difference of PPO colored products, customer complaints
Cause Analysis
Differences in processing temperature and residence time cause base color change superimposed with color powder temperature resistance; changes in regrind ratio also affect hue; during on-site troubleshooting, verify item by item according to this mechanism, and avoid blindly adjusting the machine based only on experience
Solution
Lock temperature and residence parameters; screen color powders by temperature resistance; fix and record the regrind ratio; 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 PPO color difference check thermal history and regrind; verify color powder temperature resistance first; 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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