| 摘要 |
The present invention relates to the thickening of pulp suspensions. A low consistency pulp suspension is fed to a pre-thickener ( 10 ) through an inlet conduit ( 18 ). A layer of thickened pulp, formed on a filter surface ( 22 ), is pushed along the filter surface by a cleaning member to the discharge end of the pre-thickener and is discharged through the outlet ( 20 ). The cleaning member comprises a rotating shaft ( 30 ), on which shaft at least one screw thread ( 32 ) is fixed so as to leave a free space between the shaft and the screw thread. Essentially non-thickened pulp is allowed to flow through the apparatus via this space.
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