Valmet Fibertech Aktiebolag

Sunds Defibrator Industries

Lennart Svensson

Kjell Forslund

Anders Bergdahl

Bj&ouml;rn Wikstr&ouml;m

Borje Fredriksson

A pressure screen for separating a liquid mixture is disclosed, comprising a screen housing forming a cylindrical screen chamber, and an inlet housing directly connected to the screen housing and forming a cylindrical inlet chamber, the diameter of which is less than the diameter of the screen chamber. An inlet member is positioned on the inlet chamber for supplying a suspension to be separated substantially tangentially into the inlet chamber and an outlet member is positioned on the inlet chamber for discharging coarse contaminants from the inlet chamber, whereby the scrap particles are prevented from entering the screen chamber.

Pressure screen with scrap separation

Screening apparatus is disclosed for separating fiber suspensions comprising a housing having an inlet for the fiber suspension, a stationary tubular screen dividing the interior of the housing into a central chamber for receiving the fiber suspension from the inlet and an outer accept chamber for receiving an accept portion of the fiber suspension which has passed through the stationary tubular screen, a rotor journalled on the housing for rotation within the central chamber coaxially with the stationary tubular screen, the rotor including a rotationally symmetrical element, a reject chamber for receiving a reject portion of the fiber suspension at one end of the stationary tubular screen, and an annular passage for dilution liquid including a stationary annular wall portion juxtaposed with the rotationally symmetrical element of the rotor.

Screening apparatus with dilution liquid supply means

Screening apparatus is disclosed for separating fiber suspensions including a housing having an inlet for the fiber suspension, a stationary tubular screen having an inlet end adjacent to the housing inlet and an outlet end, and dividing the interior of the housing into a central chamber for receiving the fiber suspension from the inlet, and an outer accept chamber for receiving an accept fraction of the fiber suspension, a rotor journalled on the housing for rotation within the central chamber coaxially with the stationary tubular screen, a reject passage for receiving a reject portion of the fiber suspension at the outlet end of the stationary tubular screen, and an annular reject passage which has a radial width and a cross-sectional area at the outlet end of the stationary tubular screen for discharging the reject portion of the fiber suspension from the central chamber to the reject passage, the annular reject passage including an annular flange attached to the inner wall of the passage, resilient tubing disposed in the annular groove connectable to a source of pressure whereby the resilient tubing can be extended and contracted and an elastic ring surrounding the resilient tubing.

Screening apparatus with reject flow restriction means

Methods and apparatus are disclosed for uniformly distributing a flowing medium flowing in a first direction in a conduit onto a surface so as to form a uniformly distributed medium thereon having a width greater than that of the conduit, the method including deflecting the flow of the flowing medium and simultaneously spreading the flowing medium from the width of the conduit to the greater width in a direction transverse to the first direction, and again deflecting the flowing medium in a passage having a generally curvilinear shape transverse to the surface in order to provide a substantially uniformly distributed and parallel flow of the flowing medium onto the surface. The disclosed apparatus includes a distribution housing including an inlet for the conduit and an outlet for the surface so as to form a uniformly distributed medium thereon, the distribution housing including a first distribution chamber substantially transverse to the conduit and diverging from the inlet to a substantially curved surface, a second distribution chamber extending from the substantially curved surface in a direction opposite that of the first distribution chamber, and a passage associated with the substantially curved surface for deflecting the flowing medium between the first distribution chamber and the second distribution chamber so as to provide a substantially uniformly distributed parallel flow of the flowing medium onto the surface.

Growing community of inventors

Sundsvall, Sweden

Lennart Svensson