B - Operations – Transporting – 27 – N
Patent
B - Operations, Transporting
27
N
241/21
B27N 3/28 (2006.01) B02C 18/00 (2006.01)
Patent
CA 1223578
METHOD AND APPARATUS FOR EXTRUSION PROCESSING OF CELLULOSE-BEARING MATERIALS Abstract of the Disclosure An improved, low cost, energy efficient extrusion device and method for processing of cel- lulose- or fiber-bearing materials (e.g., wood chips, crop residues, whole or ground soybeans) is described which includes a transition screw sec- tion designed to smooth out material flow through the extruder and allow creation of increased barrel pressure and temperature levels. The transition section includes first and second alternating flights, with the depth of the first flight being less than that of the second flight and preferably gradually increasing until it equals the second flight depth. The overall extruder apparatus also advan tageously includes a single flighted inlet screw section and a double flighted compression screw section respectively disposed on opposite sides of the transition section; in addition, the extruder has a pressure responsive adjustable die so that the effective dimensions of the die opening can be varied during the extrusion operation. Extrusion of wood chips to produce a defibrated wood product useful in the manufacture of fiber board or paper products can be accomplished according to the invention with a per ton energy consumption substantially below that of conventional processes.
468887
Hauck Bobbie W.
Huber Gordon R.
Gowling Lafleur Henderson Llp
Wenger Manufacturing
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