Extrusion & Post
11 görüntüleme
CEF extrusion melt fracture
Sorun Belirtisi
CEF shows severe melt fracture at too high extrusion rates, the extrudate twisted in a spiral shape
Neden Analizi
CEF 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 low
Çözüm
1) Reduce the extrusion rate to 2-3m/min; 2) Increase the die L/D ratio to 15-20; 3) Increase the extrusion temperature to 160-220°C; 4) Add a small amount of low-elasticity resin to reduce system elasticity; 5) Progressive converging die entrance design
Temel Çıkarım
Melt fracture is caused by elastic recovery exceeding the critical value, speed reduction and longer die are the core countermeasures
Bu faydalı oldu mu?
0 kişi bunu faydalı buldu
Geri bildiriminiz için teşekkürler!