Extrusion & Post
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CEF vacuum section material spitting
Fenómeno del problema
The CEF extrusion vacuum section spits material and the vent hole is blocked
Análisis de la causa
The CEF melt viscosity is low and overflows in the vacuum section; the vacuum section temperature is high and the viscosity is lower, aggravating the spitting; the vent hole design is improper
Solución
1) Reduce the vacuum section temperature by 5-10°C to increase the viscosity; 2) Add a baffle above the vent hole to prevent spitting; 3) Increase the screw speed to accelerate pushing and reduce residence time
Conclusión clave
Material spitting is caused by low melt viscosity; reducing temperature and adding a baffle are the key
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