Method for cooling and ozone bleaching wood pulp

Details Method for cooling and ozone bleaching wood pulp Method for cooling and ozone bleaching wood pulp

1995-09-28

1997-11-18

Alvo, Steven

Paper making and fiber liberation

Processes of chemical liberation, recovery or purification...

With squeezing, compression, rubbing, kneading

162 65, D21C 9153

Patent

active

056883684

ABSTRACT:
A method and apparatus for cooling wood pulp, coming from a high temperature bleaching stage at a consistency of approximately 10%, prior to introducing the wood pulp to a low temperature bleaching stage, including the steps of exposing the pulp to a thickening press in order to extract sufficient liquor from the pulp to increase the consistency to more than 25%; fluffing the pulp and depositing it on a moving bed cooler having a provision for blowing air through the pulp; and blowing cooling air through the pulp by using an air pump device with appropriate ducting. By first thickening the pulp, the mass of pulp to be cooled is significantly reduced and energy savings proportionate to the mass reduction are realized.

REFERENCES:
patent: 2721356 (1955-10-01), Litvan et al.
patent: 3963561 (1976-06-01), Richter
patent: 4088529 (1978-05-01), Ryhman et al.
patent: 4450044 (1984-05-01), Fritzold et al.

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