Process for preparing pulp for paper making

Details Process for preparing pulp for paper making Process for preparing pulp for paper making

D - Textiles, Paper

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D21B 1/02 (2006.01) D21C 1/02 (2006.01) D21C 1/06 (2006.01) D21C 3/22 (2006.01) D21C 7/12 (2006.01) D21C 9/16 (2006.01)

Patent

CA 1287705

PROCESS FOR PREPARING PULP FOR PAPER MAKING ABSTRACT OF THE DISCLOSURE This invention relates to a process for producing pulp for paper making. This invention involves the chemical impregnation of wood cellulosic fragments such as chips with an alkaline aqueous liquor having at least one agent acting to provide hydrophilic groups and as an antioxidant capable of protecting the chips against oxidation and which develops hydrophilic groups during the cooking stage. The impregnated chips are cooked using saturated steam in the substantial absence of air at a high temperature and pressure to a K value of at least about 1000 to provide softened chips. The softened chips are refined to produce pulp suitable for paper making. According to a supplementary disclosure, in industrial or semi-industiral applications, the K value can be substantially lower, in the range of 250 plus.

542643

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