Injection Molding
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EEA injection mold venting burnt
Problembeschreibung
Insufficient venting in EEA injection mold, air in the cavity compressed and heated causing local burnt
Ursachenanalyse
Insufficient vent groove area or improper position; injection speed too fast, air having no time to escape; air compressed to high temperature >200°C causing oxidative burnt
Lösung
1) Increase vent groove area, depth 0.02-0.03mm, width 5-10mm; 2) Set vent grooves in the last-fill area of the melt; 3) Reduce injection speed to reduce air compression; 4) Multi-stage injection with slow advancement for venting
Wichtigste Erkenntnis
Burnt is caused by insufficient venting and high-speed injection compressing air; increasing venting and reducing speed is the key
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