Injection Molding
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Premature gate freezing in EVA '2079851475616104452
Problem Phenomenon
EVA injection molded product gate freezes within 0.5-1s during holding stage; holding pressure cannot transmit and product shrinks severely
Cause Analysis
Gate size too small with diameter <1mm causing rapid freezing; injection temperature too low; mold temperature too low accelerating gate cooling
Solution
1) Increase gate diameter to 1.5-2mm; 2) Increase injection temperature to 140-200°C; 3) Increase mold temperature to 40-50°C to delay gate freezing; 4) Holding pressure stepped decay rather than sudden release
Key Takeaway
Premature gate freezing is caused by small gate and low temperature; enlarging gate and raising temperature are fundamental measures
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