Method of removing latency from medium consistency pulps by pump

Details Method of removing latency from medium consistency pulps by pump Method of removing latency from medium consistency pulps by pump

1984-05-08

1986-06-24

Alvo, Steve

Paper making and fiber liberation

Processes of chemical liberation, recovery or purification...

Charging and/or discharging fibrous material

162 55, 162 57, D21D 518, D21D 528

Patent

active

045966311

ABSTRACT:
The latency of mechanical pulp is removed in a quick and simple manner. After refining of comminuted cellulosic material to produce mechanical pulp, the pulp is diluted (if necessary) to a consistency of between about 8-25%, 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.

REFERENCES:
patent: 4361464 (1982-11-01), Karnis
patent: 4435163 (1984-03-01), Gullichsen et al.
Rydholm "Pulping Processes", Interscience Publishers; New York, 1967, pp. 392-395.
Dawson et al. article "A Rapid Method for Developing . . . ", Pulp and Paper of Canada, 1978, vol. 79, pp. 81-86.
"Noram" brochure, The Domtar Disintegrator, May 1, 1978.
Brochure of D. J. Murray Manufacturing Co., 1948, "Murray Pulp Stock Agitator".

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