Molds & Tooling
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Twisting deformation of PU products
Problem Phenomenon
PU products twist 2-3°/100mm along the axis
Cause Analysis
Asymmetric cooling causes shrinkage differences on each face, producing twisting moment; gate position produces asymmetric flow orientation
Solution
1) Symmetric cooling design to ensure uniformity of each face; 2) Symmetrical gate arrangement; 3) Annealing to release twisting stress
Key Takeaway
Twisting deformation is caused by asymmetric cooling; symmetric cooling is key
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