Process for the production of paper

摘要

The present invention relates to a process for producing paper which comprises: providing an aqueous suspension comprising cellulosic fibers, adding to the suspension, after all points of high shear, a cationic polysaccharide; an inorganic polymer P1 being a cationic polyaluminium compound; and a polymer P2 being an anionic polymer; and, dewatering the obtained suspension to form paper.

主权项

1. A process for producing paper providing improved drainage and retention which comprises:
(i) providing an aqueous suspension comprising cellulosic fibers, (ii) adding to the suspension after all points of high shear a drainage and retention aid comprising:
a. a cationic starch having a degree of cationic substitution (DSC) from 0.01 to 0.5, and a charge density of from about 0.05 to about 6.0 meq/g;b. an inorganic polymer P1 being a cationic polyaluminium chloride having a charge density in the range of from 2.5 to 10.0 meq/g; andc. a polymer P2 being an anionic polymer selected from anionic silica-based polymers comprising anionic silica-based particles having an average particle size in the range of from about 1 to about 10 nm; and (iii) dewatering the obtained suspension to form paper.