Injection Molding
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MP '2079851475616104452 multi-cavity filling imbalance
Problem Phenomenon
MP injection 8-cavity mold, cavity filling amounts differ ±15%, some cavities short shot, some flash
Cause Analysis
runner design unbalanced, runner lengths and resistances of the cavities inconsistent; gate sizes of the cavities inconsistent
Solution
1) adopt a balanced runner design to ensure equal runner length and resistance for all cavities; 2) gate sizes precisely consistent ±0.01mm; 3) reduce injection speed to reduce the resistance difference effect; 4) use mold flow analysis software to optimize runner design
Key Takeaway
multi-cavity filling imbalance is caused by runner design; balanced runners and mold flow analysis are key
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