Extrusion & Post
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PP Extrusion Melt Fracture
Problem Phenomenon
Periodic roughness, sharkskin-like, on PP extruded sheet/profile surfaces.
Cause Analysis
Die exit shear stress exceeds the critical value; die temperature too low, speed too fast.
Solution
①Raise die temperature by 3~5℃; ②reduce extrusion speed; ③polish die lips; ④add fluoropolymer processing aid (PPA).
Key Takeaway
Exit roughness: raise temperature, reduce speed, apply PPA.
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