Production of paper and board

Details Production of paper and board Production of paper and board

D - Textiles, Paper

21

H

9/51

D21H 17/37 (2006.01) D21H 17/53 (2006.01) D21H 17/68 (2006.01) D21H 21/10 (2006.01) D21H 23/76 (2006.01)

Patent

CA 1255856

ABSTRACT Newsprint or fluting medium is made from an aqueous suspension of cellulosic fibres, the suspension having improved drainage and retention properties. In the suspension is included 0.005 to 0.1% dry weight based on the dry weight of the suspension of a water-soluble, high molecular weight substantially non-ionic polymer selected from a group consisting of polyethylene oxides and polyacrylamides containing not more than 10 mole % anionic groups and not more than 10 mole % cationic groups and having a molecular weight above 100 000. Also included in the suspension is 0.02 to 2% dry weight based on the dry weight of the suspension of bentonite-type clay to give an aqueous suspension consisting essentially of pulp, water, the polymer and fillers. The suspension is, however, substantially free of filler. The bentonite-type clay is added to the aqueous suspension and the polymer is subsequently added. The aqueous suspension is formed from pulp having a cationic demand of at least 0.1%; this demand being the amount of polyethyleneimine cationic polymer that has to be added to give a significant increase in fibre retention and improvement in drainage.

568679

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