Injection Molding
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Warpage deformation of PET injection molded parts
Fenómeno do problema
PET injection molded products warp after demolding, with flatness exceeding the tolerance range.
Análise das causas
Uneven mold temperature distribution causes inconsistent crystallinity and shrinkage rates in various areas; uneven wall thickness causes cooling differences; molecular orientation is asymmetric.
Solução
Equalize mold temperature (within ±3°C); design products with uniform wall thickness; optimize gate position; extend cooling time.
Conclusão principal
The root of PET warpage lies in uneven shrinkage.
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