Blow Molding
3 Aufrufe
Severe parison sag in EVA extrusion '2079851475616104457
Problembeschreibung
EVA extrusion '2079851475616104457 parison sag of 20-40mm causes bottle bottom wall thickness of only 0.3-0.4mm
Ursachenanalyse
EVA melt strength low with parison stretched thin under gravity; parison extrusion speed slow increasing sag time; parison temperature too high with low viscosity worsening sag
Lösung
1) Add slight crosslinking agent 0.3-0.5wt% to increase melt strength; 2) Increase parison extrusion speed to shorten sag time; 3) Lower parison temperature by 10-15°C to increase viscosity; 4) Wall thickness controller to compensate sag
Wichtigste Erkenntnis
Parison sag is caused by low melt strength; slight crosslinking and wall thickness control are key
War das hilfreich?
0 Personen fanden dies hilfreich
Vielen Dank für Ihr Feedback!