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