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 Extrusion, Single Screw
 melt transport in extruder vent section
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g.weigerstorfer@erema.at Member Posts: 2 |
posted June 18, 2009 01:51 AM
  
We are a global player in the recycling business. Venting is allways one of our top topics. We used to believe that "foaming" of the melt in the vent-area is causing melt to come up the vent (it is definitely not back pressure). There is definitely enough volumen available in the flights. Now I am quite certain that it is the transport-ability of the melt that is causing problems. I know this from recycling of highly filled film (breathable) that picks up moisture. Now I think we have the same problem when running heavily printed PE-films. I think the melt slips in the barrel too much to get transported. Does anyone have experience with that sort of vent-problem? Could a grooved barrel in the vent-section help? Any answer would be highly appreciated. Thanks Georg IP: Logged |
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