Extrusion & Post
10 조회수
Melt fracture in EAA extrusion
문제 현상
EAA shows severe melt fracture when the extrusion rate is too high, and the extrudate is spirally distorted
원인 분석
EAA melt elasticity is 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
해결 방법
1) Reduce the extrusion rate to 2-3m/min; 2) Increase the die L/D ratio to 15-20; 3) Raise the extrusion temperature to 180-240°C; 4) Add a small amount of low-elasticity resin to reduce system elasticity; 5) Design a gradually converging die entry
핵심 요약
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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