D - Textiles – Paper – 21 – D
Patent
D - Textiles, Paper
21
D
92/34
D21D 5/02 (2006.01) D21D 5/00 (2006.01)
Patent
CA 2013011
Method and means is disclosed for treating pulp, in particular fiber suspensions of the pulp and paper industry, and more specifically, for improvement of pulp mill screening plants, to make their operation more effective and to reduce the need for equipment to reduce the investment costs etc. In the known screening process it is usually desirable to increase the pulpconsistency after the screening to a range of 10 to 15% for storing or after- treatment. It is also desirable to handle rejects by either refining or some other method, but usually at consistency which is higher than that of screening. In other words, the pulp flows always have to be thickened after screening. The present invention comprises a method and means for screening pulp in a pressurized, closed space by means of screens in a consistency range of 1 to 5% and by means of centrifugal cleaners in a consistency below 1%. The various pulp screening and/or cleaning stages are effected in a pressurized state in a closed space in the screening plant. Access of air to the treated pulp is prevented by carrying out the thickening stages in a pressurized state, at the initial pressure corresponding to that of the preceding screening and/or cleaning stage.
Henricson Kaj
Pikka Olavi
A. Ahlstrom Corporation
Gowling Lafleur Henderson Llp
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