Injection Molding
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EVOH injection gate freezes too early
Problem Phenomenon
EVOH injection product gate freezes within 0.5-1s during the holding stage, holding pressure cannot be transmitted, product shrinkage severe
Cause Analysis
Gate size too small, 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 190-230°C; 3) Increase mold temperature to 40-50°C to delay gate freezing; 4) Holding pressure stepwise decay rather than sudden release
Key Takeaway
Premature gate freezing is caused by small gate and low temperature; enlarging the gate and increasing temperature are fundamental measures
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