Extrusion & Post
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EAA vacuum section overflow
Problem Phenomenon
Material overflow at the vacuum section of EAA extrusion, vent hole blocked
Cause Analysis
EAA melt viscosity low and overflowing at the vacuum section; vacuum section temperature too high making viscosity even lower and aggravating overflow; improper vent hole design
Solution
1) Reduce 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 time
Key Takeaway
Overflow is caused by low melt viscosity; lowering temperature and adding a baffle is key
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