Extrusion & Post
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PVA vacuum vent section material overflow
Problembeschreibung
Material overflow at the PVA extrusion vacuum vent section, vent hole clogging
Ursachenanalyse
PVA melt viscosity low, overflowing at the vacuum vent section; vacuum vent section temperature on the high side, viscosity even lower, aggravating overflow; vent hole design improper
Lösung
1) Lower vacuum vent section temperature by 5-10°C to increase viscosity; 2) Add a baffle above the vent hole to prevent overflow; 3) Increase screw speed to accelerate conveying and reduce residence
Wichtigste Erkenntnis
Overflow is caused by low melt viscosity; temperature reduction and baffle are the key
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