Extrusion & Post
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Sharkskin on the surface of PET extruded pipes
Problem Phenomenon
Regular sharkskin-like rough texture appears on the surface of PET extruded pipes, with a rough hand feel.
Cause Analysis
Excessive extrusion speed causes melt fracture; die head temperature is on the low side and skin viscosity is high; the die head inner wall is rough.
Solution
Reduce extrusion speed or increase die head temperature; reduce melt viscosity (appropriately increase temperature); polish the die head inner wall.
Key Takeaway
PET pipe sharkskin is a typical manifestation of melt fracture.
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