Processing Machinery
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PA66 batch color difference
Problem Phenomenon
Different batches of PA66 products have inconsistent colors, customer complaints
Cause Analysis
Raw material hue fluctuation, masterbatch metering deviation, and process temperature changes all cause batch color difference; during on-site troubleshooting, verify item by item according to this mechanism, avoiding blindly adjusting the machine based only on experience
Solution
Incoming inspection of hue; regular calibration of masterbatch metering scales; lock process temperature; first-article color comparison when changing batches; after adjustment, take continuous samples to verify the effect, confirm stability before resuming mass production
Key Takeaway
Color difference control requires locking the three links of raw material, metering, and process; after confirming effectiveness, fix the parameters and practices into the work instructions to prevent recurrence; include this case in the defect archive as a troubleshooting reference for subsequent similar problems
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