Extrusion & Post
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POE extrusion melt fracture
Fenómeno do problema
When the POE extrusion rate is too high, severe melt fracture occurs, and the extrudate shows spiral distortion
Análise das causas
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
Solução
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
Conclusão principal
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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