Extrusion & Post
2 Aufrufe
POE extrusion melt fracture
Problembeschreibung
When the POE extrusion rate is too high, severe melt fracture occurs, and the extrudate shows spiral distortion
Ursachenanalyse
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
Lösung
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
Wichtigste Erkenntnis
Melt fracture is caused by elastic recovery exceeding the critical value; reducing speed and lengthening the die are the core countermeasures
War das hilfreich?
0 Personen fanden dies hilfreich
Vielen Dank für Ihr Feedback!