Patent ID: 6170769
Filing Date: 2001-01-09
Classification: D21D

Abstract:
A screening apparatus for separating fiber suspensions comprising a housing including an interior and an inlet for said fiber suspension, a stationary tubular screen having an inlet end adjacent to said inlet and an outlet end, and dividing said interior of said housing into a central chamber for receiving said fiber suspension from said inlet and an outer accept chamber for receiving an accept fraction of said fiber suspension which has passed through said stationary tubular screen, a rotor journalled on said housing for rotation within said central chamber coaxially with said stationary tubular screen, a reject passage for receiving a reject portion of said fiber suspension at said outlet end of said stationary tubular screen, and flow restriction means defining an annular reject passage having a radial width and a cross-sectional area at said outlet end of said stationary tubular screen for discharging said reject portion of said fiber suspension from said central chamber to said reject passage, said flow restriction means comprising an expandable and contractable annular member for decreasing and increasing said cross-sectional area of said annular reject passage.