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US 5,441,157 AGranted
Method and device for separating a suspension, preferably a fibre suspension
AssigneeCelleco Hedemora AB
InventorRoland Fjallstrom
Life of this patent
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AssigneeCelleco Hedemora AB
InventorRoland Fjallstrom
Estimating the term…
A suspension containing fine and coarse particles is sprayed under high pressure by way of spray nozzles (10) against a rotating filter medium (7), so that the suspension is separated into a fine fraction, which passes through the filter medium and which contains said fine particles, and a coarse fraction, which does not pass through the filter medium and which contains said coarse particles. According to the invention the filter medium (7) is rotated by way of a drive motor (6) at a speed such that coarse particles and liquid developing on the side of the filter medium are removed from the filter medium substantially as the result of the centrifugal force the coarse particles and liquid are subjected to. In consequence the filter medium is efficiently kept clean during operation, which increases the capacity and improves the separation efficiency.
A method of separating a suspension containing relatively fine particles and relatively coarse particles which comprises spraying the suspension against a side of a rotating filter medium so that a fine fraction of the suspension containing said fine particles is forced through the filter medium, while a coarse fraction of the suspension containing said coarse particles does not pass through the filter medium, rotating said filter medium about an axis at a speed sufficient to move coarse particles and liquid of said coarse fraction left on the filter medium by centrifugal force radially of said axis and removing substantially all said coarse particles and liquid from said side of said filter medium by said centrifugal force.
A device for separating a fiber suspension containing relatively fine particles and coarse particles in the form of fibers and having a fiber concentration in the range of 0.2 to 2.0% comprising a filter sheet in the shape of a circular annular disc having a center and two opposite sides, drive means for rotating said filter sheet about a rotational axis extending through the center of said filter sheet substantially transversely thereto, spray means positioned to spray the fiber suspension against one side of the filter sheet to separate the suspension into a fine fraction which passes through the filter sheet and which contains fine particles, and a coarse fraction which does not pass through the filter sheet and which contains said coarse particles, wherein the drive means rotates the filter sheet about said axis at a speed such that the coarse particles and liquid developing on said one side of the filter sheet during operation are received from the filter sheet substantially as the result of the centrifugal force said coarse particles are subjected to by said rotation, wherein:
Dependencies are inferred from the claim text.