Injection Molding
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Warpage in EAA '2079851475616104452
Problem Phenomenon
EAA injection molded products warp 2-3mm/100mm after demolding, flatness does not meet the standard
Cause Analysis
EAA has large shrinkage and uneven mold temperature causes anisotropic shrinkage differences; improper gate position, uneven release of flow orientation stress; insufficient cooling time
Solution
1) Raise the mold temperature to 40-60°C to reduce temperature difference; 2) Increase the holding pressure to 50-70MPa; 3) Optimize the gate position to make the flow uniform; 4) Extend the cooling time; 5) Anneal to release residual stress
Key Takeaway
Warpage is caused by shrinkage differences and orientation stress; uniform mold temperature and holding pressure are the key
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