Injection Molding
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Premature Gate Freezing in PU '2079851475616104452
Problem Phenomenon
PU injection molded product gate freezes within 0.5-1s in the holding stage, holding pressure cannot be transmitted, product sink marks 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 60-120°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 the fundamental measures
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