Injection Molding
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POE '2079851475616104452 gate freezing too early
Problem Phenomenon
POE injection molded product gate freezes within 0.5-1s during the holding stage, holding pressure cannot be transmitted, product sink 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 gate diameter to 1.5-2mm; 2) Raise injection temperature to 160-200°C; 3) Raise mold temperature to 40-50°C to delay gate freezing; 4) Holding pressure decays in steps rather than being suddenly released
Key Takeaway
Premature gate freezing is caused by small gate and low temperature; enlarging the gate and raising temperature are the fundamental measures
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