Extruder with feed-back means
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United States of America Patent
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-
Jul 31, 2012
Grant Date -
Jan 29, 2009
app pub date -
Jan 17, 2006
filing date -
Jan 21, 2005
priority date (Note) -
In Force
status (Latency Note)
Importance
Abstract
Extruder (1) for processing material, comprising an extruder barrel (3) containing a bore (5) and at least one extruder screw (11) positioned within said bore, the bore having an upstream inlet portion for feeding the material to be processed and a downstream outlet portion connectable to an extruder exit (7) for material processed through the extruder, the at least one extruder screw has a length:diameter ratio of less than 20:1, the extruder further comprising at least one recycling channel (13, 15) running through the barrel from the outlet portion of the bore and at least two recycling exits (19, 21, 23) that connect a recycling channel to the bore upstream of the outlet portion by and further comprising means for directing the material through the at least one recycling channel and the recycling exits and/or the extruder exit.
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