Injection Molding
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Irregular deformation of the product after demolding
Problem Phenomenon
Irregular deformation of the product after demolding, flat areas become curved, dimensions out of tolerance, warpage direction related to uneven shrinkage
Cause Analysis
Uneven product wall thickness, large shrinkage differences in all directions
Uneven mold cooling, temperature difference causing shrinkage differences
Insufficient injection pressure or uneven holding
Improper gate position, unbalanced flow causing orientation differences
Product temperature too high at demolding, insufficient rigidity, deformation
Solution
Optimize wall thickness design to be as uniform as possible
Improve cooling water channel layout to make mold temperature uniform
Increase holding pressure to ensure compaction in all directions
Adjust gate position to balance flow
Lower mold temperature to the low side of 40-80°C, extend cooling
Key Takeaway
Warpage needs to be addressed from wall thickness uniformity, cooling uniformity and flow balance
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