Extrusion & Post
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POM melt fracture and rough surface
Problem Phenomenon
Sharkskin-like roughness appears on the surface of POM products.
Cause Analysis
Excessively high extrusion or injection speed causes melt fracture; low die temperature; large shear rate.
Solution
Reduce the injection/extrusion speed; raise the melt temperature and mold temperature; optimize the flow speed.
Key Takeaway
POM melt fracture is the consequence of over-shearing.
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