Patent ID: 7892400
Filing Date: 2011-02-22
Classification: D21B,D21D

Abstract:
1. Apparatus for pre-treating wood chip material comprising: a pressure housing having an inlet at an inlet end and a discharge at a discharge end; a screw press formed in the housing, wherein the screw press receives material from the housing inlet, and has a shaft that is rotatable about a screw shaft axis to convey and compress material along the screw axis toward the discharge end; a decompression region for receiving and fully decompressing the chips from the screw press; and a refiner within the housing including a mechanical refining rotor having a rotor shaft that is co-axial with the screw shaft axis, and wherein the refiner receives material from the decompression region and fiberizes the material between one refining surface on the rotor and another refining surface spaced from the rotor within the housing before discharging from the discharge end, said screw shaft being joined to said rotor shaft.