Extrusion & Post
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Material Overflow at CMC Vacuum Vent Section
Problem Phenomenon
Material overflows at the vacuum vent section during CMC extrusion, clogging the vent hole
Cause Analysis
CMC melt viscosity is low and overflows at the vacuum section; vacuum section temperature is high and viscosity is lower, aggravating overflow; vent hole design is improper
Solution
1)Lower vacuum section temperature by 5-10°C to increase viscosity; 2)Add a baffle above the vent hole to prevent overflow; 3)Increase screw speed to accelerate conveying and reduce residence
Key Takeaway
Overflow is caused by low melt viscosity; temperature reduction and baffle are the key
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