Molds & Tooling
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EVA product twist deformation
Problem Phenomenon
EVA product twists 2-3°/100mm along the axis
Cause Analysis
Asymmetric cooling causing shrinkage differences on each face producing a twisting moment; gate position producing asymmetric flow orientation
Solution
1) Symmetric cooling design to ensure uniformity on all faces; 2) Symmetric gate arrangement; 3) Annealing to release twisting stress
Key Takeaway
Twist deformation is caused by asymmetric cooling; symmetric cooling is key
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