B - Operations – Transporting – 07 – B
Patent
B - Operations, Transporting
07
B
B07B 1/15 (2006.01) D21B 1/02 (2006.01)
Patent
CA 2105176
The invention relates to an apparatus for separating finer and coarser material fractions of bulk material from each other, especially for separating sawdust from wood chips, the apparatus comprising a plurality of successive rollers (2) rotating about parallel axes of rotation, the upper surfaces of the rollers providing a path for the mate- rial to be screened; at least one drive means for rotating the rollers (2); and a means for feeding the material to be screened to the infeed end of said path. There are radial and essentially axial grooves (5, 6) on the surface of the rollers (2), the grooves forming teeth (7) onto the surface of the rollers (2), and the teeth (7) of each roller (2) interdigi- tate with the radial grooves (5) of the adjacent roller (2), whereby the teeth (7) and radi- al grooves (5) form slots (8) between them for the particles of the material to be screened. With this construction it is possible to prevent the particles that are bigger than the grain size desired from passing through the screen.
Jokinen Mikko
Kurki Timo
Andritz Oy
Sim & Mcburney
LandOfFree
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