Screening method and apparatus

Details Screening method and apparatus Screening method and apparatus

B - Operations, Transporting

07

B

B07B 1/14 (2006.01) B07B 9/00 (2006.01) B07B 13/18 (2006.01) D21B 1/02 (2006.01)

Patent

CA 2084375

The present invention concerns a screening method and apparatus for sorting wood chips into three categories, namely, accept chips, overthick and/or overlong chips requiring further processing and reject fines. The chips are fed onto a disc screen. A major portion of fines and a portion of accepts fall by gravity through clearances between the discs (1) of the disc screen and a portion of the chips travels over the disc screen. Screening of chips on the disc screen is cut short before all accept chips have fallen through the disc screen. Chips travelling over the discharge end of the disc screen are routed onto a roller screen (10), whereby the remaining portion of accepts can fall by gravity through the roller screen while overthick and/or overlong chunky chips are conveyed over the discharge end of the roller screen.

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