Material Drying
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Silver Streaks Caused by Moisture in CMC Processing
Fenómeno del problema
White silver streak marks appear on the surface of CMC injection molded products
Análisis de la causa
Raw material contains moisture >0.05%, which vaporizes during high-temperature processing to form bubbles that are stretched into silver streaks; insufficient drying or condensed water vapor in the hopper
Solución
1)Dry raw material at 80°C for 3-4h to moisture content <0.02%; 2)Increase back pressure 0.5-1MPa for venting; 3)Reduce injection speed to avoid air entrapment; 4)Heat the hopper to prevent condensed water vapor
Conclusión clave
Silver streaks are caused by moisture vaporization and stretching; drying and venting are the main countermeasures
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