Molds & Tooling
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EVOH Product Twist Deformation
Problem Phenomenon
EVOH products twist 2-3°/100mm along the axis
Cause Analysis
Asymmetric cooling causing shrinkage differences between faces producing twisting moment; gate location producing asymmetric flow orientation
Solution
1) Symmetric cooling design to ensure uniformity of all faces; 2) Symmetric gate arrangement; 3) Anneal to release twisting stress
Key Takeaway
Twist deformation is caused by asymmetric cooling; symmetric cooling is key
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