Molds & Tooling
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Elliptical deformation of PU products
Problem Phenomenon
Ovality of PU round products after demolding >1.03
Cause Analysis
Asymmetric demolding force, product deformed by lateral force; uneven cooling, different shrinkage in each direction
Solution
1) Uniform ejection design, 8-point ejection to avoid lateral force; 2) Annular uniform cooling; 3) Extend cooling time for full setting
Key Takeaway
Elliptical deformation is caused by asymmetric demolding force; uniform ejection is key
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