Injection Molding
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EVOH injection mold venting burnt
Problembeschreibung
EVOH injection mold venting insufficient, air in the cavity compressed and heated, causing local burning
Ursachenanalyse
Insufficient vent groove area or improper position; injection speed too fast with air unable to escape in time; air compressed to high temperature >200°C causing oxidative burning
Lösung
1) Increase vent groove area, depth 0.02-0.03mm, width 5-10mm; 2) Set vent grooves in the last-filled area of the melt; 3) Reduce injection speed to reduce air compression; 4) Multi-stage injection with slow advance for venting
Wichtigste Erkenntnis
Burning is caused by insufficient venting and high-speed injection compressing air; increasing venting and reducing speed are key
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