Molds & Tooling
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EMA product elliptical deformation
Problem Phenomenon
EMA round products have ovality >1.03 after demolding
Cause Analysis
Asymmetric demolding force with lateral force deforming the product; uneven cooling with different shrinkage in each direction
Solution
1) Uniform ejection design with 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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