Interstage treatment of mechanical pulp

Details Interstage treatment of mechanical pulp Interstage treatment of mechanical pulp

1985-12-30

1988-01-12

Bashore, S. Leon

Paper making and fiber liberation

Processes of chemical liberation, recovery or purification...

Treatment with particular chemical

162 24, 162 28, 162 26, 162 71, D21C 300, D21B 116, D21B 104

Patent

active

047189800

ABSTRACT:
A two-stage pulp refining system in which the fibrous material from the first stage refiner is in contact with an alkaline bleaching solution between refining stages at a temperature of 32.degree.-96.degree. C. and at a consistency of 15-25% on an oven dry basis. The material is then diluted and then pressed to a consistency of at least 20% and passes through the second stage refiner.

REFERENCES:
patent: 4279694 (1981-07-01), Fritzvold et al.
McDonough, T. J. and Andrews, D. H.; Chemithermomechanical and Chemimechanical Pulps from Hardwood; CPPA Trans. Tech. Sect. 6, (1980), No. 2, TR37.
MacDonald, J. E., "The OPCO Process--The Most Flexible Ultra High Yield Pulping Method" Hymac Ltee Ltd, Jan. 1983.
Leask, R. A. "The OPCO Process" Tech 82, Mechanical Pulping Course.
Heitner, C. et al. "Ultra-High Yield Pulping of Eastern Black Spruce Part III, Interstage Sulfanation" International Mechanical Pulping Conference 1981.
Akerlund et al; "Defribrator Bleaching-A New Concept in TMP"; 1979 International Mechanical Pulping Conferance, Jun. 1979; pp. 237-243.

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