Extrusion & Post
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Material Overflow at EVOH Vacuum Vent
Fenómeno del problema
Material overflows at EVOH extrusion vacuum vent, vent hole clogged
Análisis de la causa
EVOH melt viscosity low, overflowing at vacuum section; vacuum section temperature too high, viscosity even lower, aggravating overflow; vent hole design improper
Solución
1) Reduce vacuum section temperature by 5-10°C to increase viscosity; 2) Add baffle above vent hole to prevent overflow; 3) Increase screw speed to accelerate conveyance and reduce residence
Conclusión clave
Overflow is caused by low melt viscosity; cooling and adding baffle are key
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