Latency removal

Details Latency removal Latency removal

D - Textiles, Paper

21

C

92/57.1

D21C 7/00 (2006.01) D21D 5/00 (2006.01) D21F 1/00 (2006.01)

Patent

CA 1245089

12 LATENCY REMOVAL ABSTRACT OF THE DISCLOSURE The latency of mechanical pulp is removed in a quick and simple manner. After refining of comminuted cellulosic material in a refiner to produce mechanical pulp, the pulp is fluidized at a consistency of about 5-30% to remove latent properties. For instance, the pulp is diluted (if necessary) to a consistency of between about 5-30% (preferably 8-15%), and the pulp is then merely pumped to a further treatment stage. Pumping is effected utilizing a centrifugal pump which fluidizes the pulp, the fluidization imparting sufficient energy to the pulp to remove the latent properties. The pulp may be pumped to a storage stage prior to passage to a screening stage and can be pumped in a direct (non-return) path from the pump to the screening stage. If desired or necessary, a portion of the pumped pulp can be recirculated and pumped again to ensure that sufficient energy is imparted thereto to effect latency removal.

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