Injection Molding
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Glass Fibre injection mold venting burnt
Fenómeno do problema
Glass Fibre injection mold venting insufficient, air in cavity compressed and heated causing local burning
Análise das causas
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
Solução
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
Conclusão principal
Burning is caused by insufficient venting and high-speed injection compressing air; increasing venting and reducing speed are key
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