Injection Molding
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Premature gate freezing in EAA '2079851475616104452
Problem Phenomenon
The gate of EAA injection molded products freezes within 0.5-1s during the holding stage, holding pressure cannot be transmitted, and product shrinkage is severe
Cause Analysis
Gate size too small, diameter <1mm, causing rapid freezing; injection temperature too low; mold temperature too low accelerates gate cooling
Solution
1) Increase the gate diameter to 1.5-2mm; 2) Raise the injection temperature to 180-240°C; 3) Raise the mold temperature to 40-50°C to delay gate freezing; 4) Use stepwise decay of holding pressure instead of sudden release
Key Takeaway
Premature gate freezing is caused by a small gate and low temperature; enlarging the gate and raising the temperature are the fundamental measures
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