Injection Molding
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PETG injection molded product warpage
Problem Phenomenon
PETG injection molded flat products bend and warp after demolding, and the flatness is unqualified.
Cause Analysis
Uneven mold temperature distribution causes inconsistent shrinkage at various parts, large wall thickness differences and uneven cooling, asymmetric molecular orientation.
Solution
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.
Key Takeaway
The core cause of PETG warpage is non-uniform shrinkage.
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