Extrusion & Post
5 مشاهدة
POE extrusion melt fracture
ظاهرة المشكلة
When the POE extrusion rate is too high, severe melt fracture occurs, and the extrudate shows spiral distortion
تحليل الأسباب
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
الحل
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
الخلاصة الأساسية
Melt fracture is caused by elastic recovery exceeding the critical value; reducing speed and lengthening the die are the core countermeasures
هل كان هذا مفيدًا؟
0 شخص وجدوا هذا مفيدًا
شكرًا لك على ملاحظاتك!