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