Injection Molding
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EVOH injection warpage deformation
Problem Phenomenon
EVOH injection molded product warps 2-3mm/100mm after demolding, flatness not meeting standard
Cause Analysis
EVOH shrinkage rate is large and mold temperature uneven, causing shrinkage differences in all directions; improper gate position with uneven release of flow orientation stress; insufficient cooling time
Solution
1) Increase mold temperature to 40-60°C to reduce temperature differences; 2) Increase holding pressure to 50-70MPa; 3) Optimize gate position for uniform flow; 4) Extend cooling time; 5) Annealing treatment to release residual stress
Key Takeaway
Warpage is caused by shrinkage differences and orientation stress; uniform mold temperature and holding pressure are key
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