Extrusion & Post
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Melt fracture problem of PFA
Problem Phenomenon
Melt fracture phenomenon appears on the surface during PFA extrusion
Cause Analysis
PFA melt can undergo elastic turbulence and wall slip even at low shear rates
Solution
Reduce the extrusion speed; raise the die temperature
Key Takeaway
PFA has typical perfluoropolymer melt fracture behavior
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