Classifying – separating – and assorting solids – Sifting – Combined type
Patent
1990-03-02
1992-08-11
Hajec, Donald T.
Classifying, separating, and assorting solids
Sifting
Combined type
209441, 209314, 209315, 209398, 241 81, B07B 900
Patent
active
051376210
ABSTRACT:
A wood chip screen system which includes a gyratory screen apparatus (10) and a disk screen (12). The gyratory system apparatus includes a top screen element (14) and a lower screen (16). The inflow end of the disk screen (12) is immediately adjacent the outflow end of the top screen element (14), while the lower screen element (16) underlies the disk screen (12) for a substantial distance. The size of the openings in the top screen element (14) may be changed by the operator to optimize the operation of the system. The openings in top screen element (14) may also vary along its length. The system produces chips within the acceptable size range, chips which are below the acceptable size range (pin chips and fines), and over-thick chips, which are subsequently typically transmitted to a chip size reduction apparatus such as a slicer.
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Hajec Donald T.
Weyerhaeuser Company
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