| 摘要 |
<p>An apparatus for screening paper stock comprises a vessel, a cylindrical screen cylinder within the vessel, a rotating element moving in the vicinity of the screen cylinder at a predetermined speed, an inlet for unscreened stock, an outlet for the screened stock, and an outlet for the stock fibers and unwanted rejectable material which does not pass through the screen cylinder. The rotating element has a contour surface with grooves formed of a first bottom plane parallel to the envelope surface, an inclined plane, an upper plane, and a side plane, the side plane being essentially perpendicular to the first plane, the inclined plane forming an angle between 5°-60° with the first plane, the upper plane being parallel to the first plane. The rotor element may be either a rotor or blade type segments. Also the screen cylinder has a contour surface. The inclined plane of the contour surface of the rotor may be the upstream or the downstream side plane. The method is also described. The invention is particulary useful in the screening of the stock flowing to the headbox of a paper making machine.</p> |
