Molds & Tooling
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Insufficient roundness of PU
Problem Phenomenon
Roundness deviation of PU round products >0.3mm
Cause Analysis
Uneven cooling causing different shrinkage in each direction; gate position causing local over-filling; asymmetric demolding force
Solution
1) Annular uniform cooling to ensure consistent shrinkage in all directions; 2) Symmetrical arrangement of gate positions; 3) Uniform ejection to avoid deformation
Key Takeaway
Insufficient roundness is caused by uneven cooling; annular cooling is key
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