Extrusion & Post
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EMA Extrusion Melt Fracture
Problem Phenomenon
When the extrusion rate of EMA is too high, severe melt fracture occurs, and the extrudate is twisted in a spiral shape
Cause Analysis
EMA 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
Solution
1) Reduce extrusion rate to 2-3m/min; 2) Increase die L/D ratio to 15-20; 3) Increase extrusion temperature to 160-210°C; 4) Add a small amount of low-elasticity resin to reduce system elasticity; 5) Gradually contracting die inlet design
Key Takeaway
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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