Material Drying
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Silver streaks caused by moisture in CEF processing
Fenómeno do problema
White silver streaks appear on the surface of the CEF injection molded part
Análise das causas
The raw material contains moisture >0.05%, which vaporizes during high-temperature processing to form bubbles that are stretched into silver streaks; insufficient drying or condensation of water vapor in the hopper
Solução
1) Dry the raw material at 80°C for 3-4h to a moisture content <0.02%; 2) Increase the back pressure 0.5-1MPa for venting; 3) Reduce the injection speed to avoid air entrapment; 4) Heat the hopper to prevent condensation of water vapor
Conclusão principal
Silver streaks are caused by moisture vaporization and stretching; drying and venting are the main countermeasures
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