Extrusion & Post
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POE extrusion melt fracture
Fenómeno del problema
When the POE extrusion rate is too high, severe melt fracture occurs, and the extrudate shows spiral distortion
Análisis de la causa
POE melt elasticity too high, elastic recovery at the die exit exceeds the critical value; die L/D ratio too short <10, melt not fully relaxed; extrusion temperature too low
Solución
1) Reduce extrusion rate to 2-3m/min; 2) Increase die L/D ratio to 15-20; 3) Increase extrusion temperature to 160-200°C; 4) Add a small amount of low-elasticity resin to reduce system elasticity; 5) Progressive converging die entrance design
Conclusión clave
Melt fracture is caused by elastic recovery exceeding the critical value; reducing speed and lengthening the die are the core countermeasures
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