Injection Molding
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EVOH injection multi-cavity filling imbalance
Problem Phenomenon
EVOH injection 8-cavity mold with filling amount difference ±15% between cavities, some cavities short shot and some flash
Cause Analysis
Unbalanced runner design with inconsistent runner length and resistance for each cavity; inconsistent gate sizes for each cavity
Solution
1) Adopt balanced runner design to ensure equal length and equal resistance for each cavity; 2) Precisely consistent gate sizes for each cavity ±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
Multi-cavity filling imbalance is caused by runner design; balanced runners and mold flow analysis are key
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