Material Drying
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PA66 30-minute time limit after drying
Fenómeno del problema
Qualified dried pellets placed in the hopper for a period of time, silver streaks reappear on products
Análisis de la causa
PA66 moisture absorption rate is fast; dried material exposed to air for over 30 minutes absorbs back excessive moisture; ordinary hoppers have no heat preservation and dehumidification function, drying results are wasted at the feeding stage
Solución
①Use immediately after drying, air exposure not over 30 minutes; ②temporary storage in heat-preserving hopper above 90℃; ③feeding system sealed, small batches with frequent replenishment; after adjustment, continuously sample to verify the effect, and resume mass production only after confirming stability
Conclusión clave
30 minutes is the exposure time limit for dried PA66; heat-preserving hopper plus sealed feeding, keeping the dried state until the injection moment, counts as completing drying; after confirming effectiveness, fix the parameters and practices into the work instruction to prevent recurrence
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