Injection Molding
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Unbalanced filling of multi-cavity in EAA '2079851475616104452
Problem Phenomenon
In an 8-cavity EAA injection mold, the filling amount of each cavity differs by ±15%, some cavities have short shots and some have flash
Cause Analysis
Unbalanced runner design, inconsistent runner length and resistance of each cavity; inconsistent gate size of each cavity
Solution
1) Use a balanced runner design to ensure equal length and equal resistance of the runners of each cavity; 2) Make the gate size of each cavity precisely consistent ±0.01mm; 3) Reduce the injection speed to reduce the influence of resistance differences; 4) Use mold flow analysis software to optimize the runner design
Key Takeaway
Unbalanced multi-cavity filling is caused by runner design; balanced runners and mold flow analysis are the key
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