Material Drying
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PC Intermittent Silver Streaks Caused by Drying Fluctuation
Fenómeno do problema
The same batch of material is normal in the morning but silver streaks appear in the afternoon, with no process change, and the problem appears intermittently and periodically by time of day.
Análise das causas
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, causing intermittent silver streaks.
Solução
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 moisture content verification in humid seasons; ⑤Check the drying system filter.
Conclusão principal
PC drying's enemy is 'secondary moisture absorption': qualified drying does not mean always qualified, dew point and sealing must be continuously monitored; intermittent silver streaks mostly require going back to check the state drift of the drying system.
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