Patent ID: 7547376
Filing Date: 2009-06-16
Classification: D21H

Abstract:
1. A process of producing a pulp sheet, said process comprising: adding a paper quality improver for papermaking to pulp in any step before a papermaking step of forming a paper layer while water in a dilute solution of a pulp material is filtered through a wire while moving thereon; wherein the paper quality improver for papermaking comprises: wherein the paper quality improver provides at least one paper quality improving effect of the following (i), (ii), and (iii): (i) standard improved bulky value: 0.02 g/cm (ii) standard improved opacity: 1.0 point or more; and (iii) standard improved brightness: 0.5 point or more; wherein the surfactant (B) is a water-soluble alcohol alkylene oxide adduct containing an alkylene oxide group having 2 to 4 carbons in an average amount of 5 to less than 150 moles per 1 mole of the alcohol; and wherein the paper quality improver provides a paper quality improving effect of a standard improved ratio in burst index of -502 or more.