Paper-making method

Details Paper-making method Paper-making method

D - Textiles, Paper

21

H

9/42

D21H 17/28 (2006.01) D21H 17/37 (2006.01) D21H 17/53 (2006.01)

Patent

CA 1232713

ABSTRACT OF THE DISCLOSURE A novel method is provided herein for making paper or paperboard with a higher dry strength than previously by adding to the fiber pulp suspension a smaller amount than previously of cationic, water-soluble starch and a synthetic retention agent. In addition, a filler can be added to the fiber pulp suspension. According to the invention, cationic, water-soluble starch is added to the fiber pulp suspension at only 0.02-1.5% (as calculated from the dry weight of the pulp) and the synthetic retention agent (which is selected from the group consisting of polyacrylamides, their derivatives and copolymers), is added at only 0.005-0.1%, (also as calculated from the dry weight of the pulp). The addition can be made either to a fiber pulp suspension which is substantially free from filler, or part of the retention agent may be added to the fiber pulp suspension before the adding of the filler, or a pre-treated filler may be added to the fiber pulp at some other stage.

452222

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