Molds & Tooling
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Insufficient PVA flatness
Problem Phenomenon
PVA flat product flatness >0.5mm/100mm, warpage
Cause Analysis
PVA shrinkage large and different in each direction; uneven mold cooling; residual stress release causing continuous warpage
Solution
1) Uniform mold temperature to reduce temperature difference; 2) Increase holding pressure to reduce shrinkage difference; 3) Annealing to release residual stress
Key Takeaway
Insufficient flatness is caused by shrinkage difference and stress; uniform cooling and annealing are the key
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