| 摘要 |
PCT No. PCT/US97/20274 Sec. 371 Date May 14, 1999 Sec. 102(e) Date May 14, 1999 PCT Filed Nov. 11, 1997 PCT Pub. No. WO98/20958 PCT Pub. Date May 22, 1998Pressure screening apparatus for screening a suspension of papermaking stock employing an enclosing housing and a cylindrical screen, with a drum type rotor, has the screen divided or formed with axially spaced annular screening zones and a corresponding number of annular reject collection areas, one for each screening zone. The collection areas are positioned so as to receive rejects from one of the screening zones only, while a rotor is formed with outlet openings that apply stock suspension to selected ones of the screening zones so that there is no mixing of rejects between screening zones, and each screening zone receives stock suspension for screening independently of the other screening zones.
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