METHOD FOR MANUFACTURING PAPERBOARD

摘要

This invention is a method for manufacturing paperboard, the method having an exceptional paper-strength-improving effect and yield-improving effect, and the method being characterized in comprising adding a papermaking additive to a pulp slurry; the pulp slurry being used having a papermaking pH of 6.5-8.5 after the additive has been added; the papermaking additive being synthesized using a monomer (A) capable of forming the repeating unit represented by general formula (A) through polymerization, a cationic vinyl monomer (C) in an amount of 1-20 mol% relative to the total monomer content of the polymerization system, a (meth)allyl sulfonic acid and/or a salt thereof (D) in an amount of 0.01-5 mol% relative to the total monomer content of the polymerization system, and glyoxylic acid or a monomer (B) capable of forming the repeating unit represented by general formula (B) through polymerization; and the papermaking additive containing a polymer having a repeating unit expressed by general formula (B). In the formulae, R1 represents H or CH3, R2 represents H or CH3, and R3 represents H, Na, K, or NH4