Material Drying
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PC Injection Cycle Fluctuation—Drying Fluctuation
Fenómeno del problema
The same batch of material is normal in the morning but silver streaks appear in the afternoon, with no process change.
Análisis de la causa
Dryer dew point drift, hopper insulation failure, or ambient humidity changes cause the dried PC to re-absorb moisture; PC absorbs moisture fast, and exposure for 1~2 hours may exceed the standard.
Solución
①Monitor the dryer dew point and regularly regenerate the molecular sieve; ②Seal the drying hopper and maintain insulation; ③Shorten the exposure time after drying; ④Strengthen verification in humid seasons.
Conclusión clave
PC drying's enemy is 'secondary moisture absorption'.
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