Material Drying
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PA12 Yellowing from Excessively High Drying Temperature
Problem Phenomenon
【Problem phenomenon】Natural-color and light-color PA12 products turned yellow after drying, and the hue of transparent parts was damaged
Cause Analysis
When the drying temperature is too high, PA12 undergoes thermal oxidation discoloration; TR90 materials clearly warn that excessively high drying temperature will cause the raw material to turn yellow, and extra attention is needed when processing natural-color or colored parts
Solution
Dry strictly at the temperature recommended by the grade and do not arbitrarily raise the temperature to rush work; light-color transparent parts take the lower temperature limit and extend the time as compensation; regularly calibrate the actual oven temperature to prevent drift
Key Takeaway
PA12 drying prefers low rather than high, and yellowing cannot be reversed once it occurs; 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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