Twin screw extruders for processing wood fiber and process for same
Number of patents in Portfolio can not be more than 2000
United States of America Patent
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N/A
Issued Date -
Nov 20, 2003
app pub date -
Apr 29, 2003
filing date -
Apr 30, 2001
priority date (Note) -
Abandoned
status (Latency Note)
Importance
Abstract
The invention is extrusion equipment and a process. The extrusion equipment links two extruders (11, 15) together. The first extruder (11) is, desirably, a counter-rotating twin screw extruder. The first extruder (11) receives organic filler, preferably wood particles or fiber, having a variable moisture content. Moisture is withdrawn from the extruder barrel. A polymer is fed from a second extruder (15) into the barrel of the first extruder (11) after the polymer is heated, mixed, and melted in the second extruder (15). The second extruder (15) can be a single screw or twin screw extruder. The combined mixture of organic filler and polymer is further mixed alone or with optional additives. The mixture is vacuum vented to remove moisture and volatiles and then extruded through a die. Additional processing steps are optional depending upon the extruded product or profile being produced.
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