Material Drying
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Silver streaks caused by moisture in CEF processing
Problem Phenomenon
White silver streaks appear on the surface of the CEF injection molded part
Cause Analysis
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
Solution
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
Key Takeaway
Silver streaks are caused by moisture vaporization and stretching; drying and venting are the main countermeasures
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