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