A screening device and a rotor

The invention relates to a screening device for screening pulp suspensions， which screening device (30) comprises a screening cylinder (20) and a rotor (10) located and rotating inside the screening cylinder (20)， in which screening device (30) the screening cylinder (20) is cylindrical and its surface comprises apertures for passing through accept of the pulp suspension during screening， in which screening device (30) the rotor (10) for rotating the pulp suspension in a screening space located between an inner surface of the screening cylinder (20) and an outer surface of the rotor (10) comprises a cylindrical rotor body (12) and a hub (14)， in which screening device in the screening space foils (15) are located. The rotor (10) of the screening device (20) comprises circular elements (18) welded or otherwise fixedly attached to the cylindrical rotor body (12) on its outer surface and foil arms (16) formed as low protrusions on the circular elements (18)， that the foils (15) are detachably attached to the foil arms (16) and that distance between the outer surface of the rotor body (12) and the inner surface of the screening cylinder (20) of the screening device (30) is 45-85 mm， preferably 55 -75 mm.