Material Drying
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Silver Streaks Caused by Moisture in CMC Processing
Problem Phenomenon
White silver streak marks appear on the surface of CMC injection molded products
Cause Analysis
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
Solution
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
Key Takeaway
Silver streaks are caused by moisture vaporization and stretching; drying and venting are the main countermeasures
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