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