Process for producing high yield bleached cellulose pulp
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United States of America Patent
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Oct 11, 1988
Grant Date -
N/A
app pub date -
Sep 9, 1985
filing date -
Sep 10, 1984
priority date (Note) -
Expired
status (Latency Note)
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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.
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