Extrusion & Post
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Surface defects caused by PVDF melt fracture
Problem Phenomenon
Periodic irregular wrinkles on the surface of extrusion and injection
Cause Analysis
The shear stress at the die exit exceeds the critical value, causing elastic instability
Solution
Reduce the extrusion speed, raise the die temperature, and increase the gap
Key Takeaway
A typical rheological problem in extrusion processing
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