Material Drying
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PA6 Silver Streaks Dominated by Moisture
Fenómeno do problema
Radial silver streaks appear on the PA6 product surface, with no obvious improvement after adjusting injection speed and temperature
Análise das causas
More than 90% of PA6 silver streaks are caused by moisture: water vapor expands sharply when the melt fills the mold and breaks through the surface layer to form fan-shaped streaks; this kind of silver streak cannot be solved by machine adjustment, and the only way out is to strengthen drying
Solução
①Check drying first: dew point below -30°C, measured moisture content meeting standard; ②Keep the hopper warm to prevent re-humidification; ③Confirm no water leakage mixing into the mold; after adjustment, continuously sample to verify the effect, and resume mass production only after confirming stability
Conclusão principal
When PA6 shows silver streaks, suspect drying first rather than the process; the three checks of dew point, moisture content and re-humidification save the time of trial-and-error machine adjustment; after confirming effectiveness, solidify the parameters and practices into the work instruction to prevent recurrence
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