Material Drying
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PA6 Silver Streaks Dominated by Moisture
Problembeschreibung
Radial silver streaks appear on the PA6 product surface, with no obvious improvement after adjusting injection speed and temperature
Ursachenanalyse
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
Lösung
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
Wichtigste Erkenntnis
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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