| 摘要 |
<p>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 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 extending outwards from the central portion, and a second grinding zone extending angularly from the outer end of the first grinding zone and being defined between one of the rotatable grinding 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.</p> |
