D - Textiles – Paper – 21 – C
Patent
D - Textiles, Paper
21
C
9/27
D21C 3/02 (2006.01) D21B 1/02 (2006.01) D21C 5/00 (2006.01)
Patent
CA 1230709
ABSTRACT OF THE DISCLOSURE The present invention concerns a procedure for produc- ing refined groundwood pulp from chips, in the procedure being used softwood and hardwood chips in such manner that the pulp that is obtained contains in mixture both matter from softwood and matter from hardwood. In the procedure, the hardwood chips are prior to the refining step pretreated by impregnating them with an alkaline solution, and the essential feature of the invention is that in the pretreatment is used an alkali hydroxide solution with concentration in the range 0.1-0.5 M, and that the pretreated hardwood chips are mixed with the softwood chips, whereafter the mixture thus obtained is refined to groundwood pulp. The pretreatment solution is preferably a sodium hydroxide solution, and it may also contain sodium sulphite. The mixing of the pretreated hardwood chips and the softwood chips is most advantageously done so that the proportion of hardwood chips in the mixture is 30-60%. The binding strength and opacity of the groundwood pulp thus obtained are such that the pulp is appropri- ate e.g. for making printing paper.
469917
Marks & Clerk
Yhtyneet Paperitehtaat Oy Jylhavaara
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