Extrusion & Post
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FEP melt fracture
Problem Phenomenon
FEP extruded products show severe surface appearance defects of melt fracture/sharkskin
Cause Analysis
FEP has a low critical shear stress (similar to other perfluoropolymers), and the extrusion speed is too high and exceeds the critical value; the die temperature is too low or the design is improper
Solution
Reduce the extrusion line speed to below the critical speed; raise the die temperature (up to 370°C); optimize the die entrance angle to reduce elastic turbulence
Key Takeaway
Melt fracture is a common challenge faced in the extrusion processing of perfluoropolymers
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