Injection Molding
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Warpage deformation of PET injection molded parts
Problem Phenomenon
PET injection molded products warp after demolding, with flatness exceeding the tolerance range.
Cause Analysis
Uneven mold temperature distribution causes inconsistent crystallinity and shrinkage rates in various areas; uneven wall thickness causes cooling differences; molecular orientation is asymmetric.
Solution
Equalize mold temperature (within ±3°C); design products with uniform wall thickness; optimize gate position; extend cooling time.
Key Takeaway
The root of PET warpage lies in uneven shrinkage.
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