Interstage treatment of mechanical pulp

Paper making and fiber liberation – Processes of chemical liberation – recovery or purification... – Treatment with particular chemical

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

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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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