Wood chip screening and processing methods and apparatus

Details Wood chip screening and processing methods and apparatus Wood chip screening and processing methods and apparatus

B - Operations, Transporting

27

L

144/26

B27L 11/00 (2006.01)

Patent

CA 1212596

IMPROVEMENTS IN WOOD CHIP SCREENING AND PROCESSING METHODS AND APPARATUS ABSTRACT OF THE DISCLOSURE A system for separating and classifying whole tree wood chip material comprising essentially wood and bark overs, chips and bark fines which is supplied to a bin or receptaole. The chip material is augered in a forward direction in a monitored flow longitudinally away from the bin while pass- ing it across a first stationary screen trough system having openings of a size to pass everything, while rejecting the overs. The acceptable chips and fines passed through the first screen trough system are then augered across a second stationary screen trough system having openings of a size to pass the fines to a fines trough, while retaining the acceptable chips. Finally, the acceptable chips are moved forwardly toward a chip discharge location while the fines passed through the second screen trough system are separately collected. The system includes mechanism for diverting chip- ped material unsuited to use in a paper mill, such as chipped tree tops, directly to the fines trough.

457232

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