Material Drying
3 Aufrufe
Severe moisture absorption of PVA raw material before extrusion
Problembeschreibung
PVA raw material moisture absorption >5%, cannot be extruded and processed normally
Ursachenanalyse
PVA polar groups are extremely hydrophilic and rapidly absorb moisture in air
Lösung
1) Vacuum dry raw material at 100°C/4h to moisture <0.5%; 2) Sealed packaging for storage; 3) Seal the extruder feed section to prevent moisture absorption
Wichtigste Erkenntnis
PVA is strongly polar and hydrophilic and must be fully dried before processing
War das hilfreich?
0 Personen fanden dies hilfreich
Vielen Dank für Ihr Feedback!