Method for the production of unbleached sulphite cellulose or bleached cellulose from a defibrated knot pulp
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United States of America Patent
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Oct 28, 1980
Issued Date -
N/A
app pub date -
Jun 28, 1979
filing date -
Jul 8, 1977
priority date (Note) -
Expired
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Abstract
Knots separated from sulphite cellulose produced by a sulphite cellulose cooking process are converted to unbleached sulphite cellulose by first separating and defibrating the sulphite knots and then treating the defibrated sulphite knots with oxygen under pressure in an alkaline milieu at an elevated temperature. The resultant cellulose may be bleached by itself, or mixed with sulphite cellulose produced from knot-free cellulose pulp for bleaching therewith.
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