Extrusion & Post
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ETFE melt extrusion sharkskin/melt fracture
Problem Phenomenon
ETFE extruded product surface is rough or has periodic streaks
Cause Analysis
Extrusion speed too high exceeding critical shear rate; die temperature too low; critical shear stress threshold of ETFE
Solution
Reduce extrusion speed; increase die temperature by 5-10°C; polish the die to reduce friction
Key Takeaway
ETFE has melt fracture phenomenon similar to FEP/PFA
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