Injection Molding
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Glass Fibre injection mold venting burnt
Problem Phenomenon
Glass Fibre injection mold venting insufficient, air in cavity compressed and heated causing local burning
Cause Analysis
Mold vent groove area insufficient or position improper; injection speed too fast, air has no time to escape; air compressed to high temperature >200°C causing oxidative burning
Solution
1) Increase vent groove area, depth 0.02-0.03mm, width 5-10mm; 2) vent grooves set at last-fill region of melt; 3) reduce injection speed to reduce air compression; 4) multi-stage injection with slow advance for venting
Key Takeaway
Burning is caused by insufficient venting and high-speed injection compressing air; increasing venting and reducing speed are key
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