B - Operations – Transporting – 02 – C
Patent
B - Operations, Transporting
02
C
92/55
B02C 7/11 (2006.01) D21B 1/00 (2006.01)
Patent
CA 1110479
ABSTRACT OF THE DISCLOSURE Grinding apparatus in which lignocellulosic material such as wood chips is ground between a pair of grinding discs which rotate relatively to one another within a housing into which the material is advanced through a feed-in opening by means of a feed screw which rotates in a concentric sleeve extending between the central feed-in opening and an intake opening for the material. The feed screw comprises a series of inner screw flights mounted on a central shaft, which screw flights support and are enveloped by a series of outer ribbon-like screw flights. The inner screw flights are designed primarily to propel the material radially out- wards towards the wall of the surrounding sleeve, whereas the outer ribbon-like screw f flights are designed primarily to advance the material in an axial direction towards the central feed-in opening.
320057
Defibrator Aktiebolag
Marks & Clerk
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