Material Drying
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Silver Streaks Caused by Moisture in CMC Processing
Fenómeno do problema
White silver streak marks appear on the surface of CMC injection molded products
Análise das causas
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
Solução
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
Conclusão principal
Silver streaks are caused by moisture vaporization and stretching; drying and venting are the main countermeasures
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