Injection Molding
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PETG injection molded product warpage
Fenómeno do problema
PETG injection molded flat products bend and warp after demolding, and the flatness is unqualified.
Análise das causas
Uneven mold temperature distribution causes inconsistent shrinkage at various parts, large wall thickness differences and uneven cooling, asymmetric molecular orientation.
Solução
Optimize mold cooling water channels to make temperature uniform; design the product with uniform wall thickness; appropriately lower the demolding temperature and extend cooling; annealing for shape correction.
Conclusão principal
The core cause of PETG warpage is non-uniform shrinkage.
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