Injection Molding
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DSTDP injection gate freezing too early
Problem Phenomenon
DSTDP injection molded product gate freezes within 0.5-1s during the holding stage, holding pressure cannot be transmitted, product sinks severely
Cause Analysis
Gate size too small, diameter <1mm causing fast freezing; injection temperature on the low side; mold temperature on the low side accelerating 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 stepwise decay rather than sudden release
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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