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