Process for producing high yield bleached cellulose pulp

Details Process for producing high yield bleached cellulose pulp Process for producing high yield bleached cellulose pulp

1985-09-09

1988-10-11

Chin, Peter

Paper making and fiber liberation

Processes of chemical liberation, recovery or purification...

With plural or specified mechanical defibering step

162 37, 162 41, 162 55, D21B 104, D21C 908

Patent

active

047769262

ABSTRACT:
A process is provided for producing high yield bleached cellulose pulp, such as groundwood pulp, thermomechanical pulp, chemimechanical pulp and waste paper pulp, having a broad field of use, which comprises bleaching cellulose pulp, thinning the pulp to a low pulp consistency; mechanically working the pulp; and fractionating the cellulose pulp into a long-fiber fraction and a fine-fiber fraction, the freeness of the long-fiber fraction exceeding the freeness of the fine-fiber fraction by from about 150 to about 600 ml C.S.F. and the fine-fiber fraction constituting from about 35 to about 70% by weight of the bleached pulp.

REFERENCES:
patent: 3994770 (1976-11-01), Lausch
patent: 4087316 (1978-05-01), Jividen et al.
patent: 4462864 (1984-07-01), Carles et al.
patent: 4502918 (1985-03-01), Mackie et al.
patent: 4534397 (1985-08-01), Norrstrom et al.
patent: 4562969 (1986-01-01), Lindahl

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