Extrusion & Post
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EAA vacuum section overflow
Fenómeno del problema
Material overflow at the vacuum section of EAA extrusion, vent hole blocked
Análisis de la causa
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
Solución
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
Conclusión clave
Overflow is caused by low melt viscosity; lowering temperature and adding a baffle is key
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