Valmet Fibertech Aktiebolag

Klas Kristr&ouml;m

Kjell Forslund

Magnus Danielsson

A screen device for separating fiber suspensions comprises a screen ( ) defining a central chamber ( ), and a rotor ( ) in the central chamber having a first ( ) and a second ( ) rotor portion, respectively, provided with first ( ) and second ( ) pulsation elements, respectively, for pulsating the suspension close to the screen along a first ( ) an a second ( ) axial screen portion, respectively, of the screen. The first rotor portion ( ) and the first axial screen portion ( ) define a first screen chamber ( ) and the second rotor portion ( ) and the second axial screen portion ( ) define a second screen chamber ( ). Distribution means ( ) are provided for dividing the incoming fiber suspension into two part streams having the same axial directions in relation to the rotor and for distributing the two part streams to the first and second screen chambers ( ), respectively.

Screen device comprising two screen chambers for separating fiber suspensions

Apparatus for treating an aqueous medium with a treatment fluid including a housing forming a treatment chamber, a rotatable rotor arranged in the treatment chamber, and including a number of rotor rings carried by the rotatable rotor and coaxially arranged at the periphery of the rotatable rotor, a number of stationary stator rings coaxially inserted between the rotor rings thus forming a number of annular axial treatment slots which have a radial size between the rotor rings and the stationary stator rings, the radial size of these slots increasing with increasing distance from the axis of the rotatable rotor, an inlet for delivering the working medium and the treatment fluid to one side of the annular axial treatment slots and an outlet for the treated working media disposed at the other side of the annular axial treatment slots, whereby the working medium is sheared in the treatment slots during operation so that substantially homogeneous shearing velocities are achieved in each of these slots.

Growing community of inventors

Kovland, Sweden

Klas Kriström

Growing community of inventors

Kovland, Sweden

Klas Kristr&ouml;m

Klas Kriström