Method for the production of unbleached sulphite cellulose...

Details Method for the production of unbleached sulphite cellulose... Method for the production of unbleached sulphite cellulose...

D - Textiles, Paper

21

C

8/78, 9/16.5

D21C 3/06 (2006.01) D21C 5/00 (2006.01)

Patent

CA 1119361

ABSTRACT OF THE DISCLOSURE The present invention provides a method for the pro- duction of unbleached sulphite cellulose of high brightness, purity and strength or for bleached cellulose from knots in which said knots are defibrated and in a first stage treated with oxygen is an alkaline milieu at a temperature above 100°C and under pressure. The unbleached cellulose so obtained may be finally bleached in a second stage alone or in admixture with conventionally produced unbleached cellulose.

306697

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