Molds & Tooling
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EVA product elliptical deformation
Problem Phenomenon
EVA round product ovality >1.03 after demolding
Cause Analysis
Asymmetric demolding force with the product deformed by lateral force; uneven cooling with different shrinkage in all directions
Solution
1) Uniform ejection design with 8-point ejection to avoid lateral force; 2) Annular uniform cooling; 3) Extend cooling time for full shaping
Key Takeaway
Elliptical deformation is caused by asymmetric demolding force; uniform ejection is key
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