Method and apparatus for controlling the effect of the...

Details Method and apparatus for controlling the effect of the... Method and apparatus for controlling the effect of the...

D - Textiles, Paper

21

D

92/43

D21D 5/18 (2006.01) B02C 7/12 (2006.01) D21D 1/30 (2006.01)

Patent

CA 1107112

S P E C I F I C A T I O N TITLE: METHOD AND APPARATUS FOR CONTROLLING THE EFFECT OF THE CENTRIFUGAL FORCE ON THE STOCK IN PULP DEFIBRATING APPARATUS INVENTOR: ROLF BERTIL REINHALL ABSTRACT OF THE DISCLOSURE A method and apparatus is provided for controlling the effect of centrifugal force on pulp stock while being ground in the grinding space of a defibrating apparatus. The grinding space includes a central portion, a first grinding zone defined between first and second rotatable grinding discs and extend- ing outwards from the central portion, and a second grinding zone extending angularly from the outer end of the first grind- ing zone and being defined between one of the rotatable grind- ing discs and a stationary grinding surface. Pulp stock to be ground is introduced into the central portion and accelerated through the first and second grinding zones by centrifugal force generated by the rotating discs. The angular second grinding zone serves to retard centrifugal force acting on the pulp in the second grinding zone to increase the dwell time of the pulp in the grinding space for achieving optimum refining efficiency.

329799

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