Material Drying
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PA6 Batch Color Difference
Problem Phenomenon
Perceivable color differences exist between different batches of PA6 products
Cause Analysis
Hue differences of the raw material batches themselves, drying and melt temperature fluctuations, and color masterbatch metering deviation all cause inter-batch color difference, and the heat stability of color powder under high-temperature processes is also a factor
Solution
Unify raw material batches or inspect hue at incoming inspection; stabilize drying and molding temperatures; regularly calibrate color masterbatch metering equipment; select heat-resistant color powder according to the highest process temperature; after adjustment, continuously sample to verify the effect, and resume mass production only after confirming stability
Key Takeaway
Batch color difference requires systematic control of the three links of raw material, temperature and metering; 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 similar problems in the future
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