Material Drying
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PA12 Yellowing from Excessively High Drying Temperature
Fenómeno del problema
【Problem phenomenon】Natural-color and light-color PA12 products turned yellow after drying, and the hue of transparent parts was damaged
Análisis de la causa
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
Solución
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
Conclusión clave
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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