D - Textiles – Paper – 21 – C
Patent
D - Textiles, Paper
21
C
9/1, 183/15, 182
D21C 3/02 (2006.01) B01D 19/00 (2006.01) B04B 5/04 (2006.01) D21C 5/02 (2006.01)
Patent
CA 2031947
1138-1 A B S T R A C T Process for producing pulp suitable as raw material for paper, board or fiberboards and the like. A pumpable alkaline slurry of fibrous raw material is conducted through a pressurized tube system by the use of pulp pumps, the pressure increasing in steps from the beginning of the process to the end of the process. On its way the slurry is repeatedly dewatered and rediluted with process liquid. An apparatus suitable for being used in carrying out the process comprises a dewatering tube and a dewatering and venting tube arranged centrally and axially within the tube which may be provided with a perforated part. The tube is provided with perforations through which gas and liquid from fiber-containing slurry introduced into the outer tube can escape. At the opposite end from the inlet end of the outer tube there is an outlet for thickened fiber-containing slurry.
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