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US 6,284,145 B1Granted
Screen plate for screening of a pulp suspension and method to separate the same
AssigneeGL&V/Celleco AB
InventorRoine Andersson
Life of this patent
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AssigneeGL&V/Celleco AB
InventorRoine Andersson
Estimating the term…
A screen plate (1) for screening of pulp suspensions, comprises a number of elongated at least partially curved screen slots (3). According to the invention every screen slot has a width which is maximally 0.8 mm, and the screen slots bend in such a way that a straight rod, which has a breadth which is less than the width of the screen slot and the length which is 5 mm, is prevented from passing through the screen slot, when the rod extends along the screen plate, independently of how this rod is oriented in relation to the screen slot. At that elongated stiff shives may be separated more efficiently by means of the screen plate. This screen plate may also be used for separating a pulp suspension into a first fraction comprising comparatively stiff fibers and a second fraction comprising comparatively flexible fibers.
Screen plate for screening of pulp suspension containing straight relatively flexible fibers, wherein said screen plate has a plurality of elongated at least partly curved screen slots, each screen slot having an inlet edge and an outlet edge and defining a flow path that extends in a direction between, and perpendicular to, the inlet and outlet edges, wherein each screen slot has a width not greater than 0.8 mm and is bent into a configuration selected such that a straight stiff fiber having a length of 5 mm and lying in a plane perpendicular to the flow path direction cannot pass into any one of said screen slots regardless of the orientation of the straight fiber in the plane.
Method of separating of pulp suspension into a first fraction comprising comparatively stiff fibers and a second fraction comprising comparatively flexible fibers, characterized in that the pulp suspension is screened by way of a screen plate (1;
Dependencies are inferred from the claim text.