Method for the production of unbleached sulphite cellulose or bl

Details Method for the production of unbleached sulphite cellulose or bl Method for the production of unbleached sulphite cellulose or bl

1979-06-28

1980-10-28

Smith, William F.

Paper making and fiber liberation

Processes of chemical liberation, recovery or purification...

Chemical treatment after start or completion of mechanical...

162 55, 162 65, 162 86, D21C 302, D21C 306

Patent

active

042305241

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.

REFERENCES:
patent: 3393121 (1968-07-01), Lea et al.
patent: 3830688 (1974-08-01), Mannbro
patent: 3886035 (1975-05-01), Laakso
Tappi, vol. 59, No. 11, 11/76, pp. 77-80.

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