Injection Molding
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Glass Fibre injection gate freezes too early
Problem Phenomenon
Glass Fibre injection molded product gate freezes within 0.5-1s during holding stage, holding pressure cannot be transmitted, product severe sink
Cause Analysis
Gate size too small, diameter <1mm causes fast 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 160-220°C; 3) raise mold temperature to 40-50°C to delay gate freezing; 4) holding pressure decays in steps 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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