Patent ID: 9598819
Date: 2017-03-21
CPC Classifications: D21H

Claim:
1. A method of treating an unbleached cellulosic furnish to improve drainage comprising adding a surfactant based brown stock wash aid comprising 5 to 30% of a triblock copolymer of polyethylene glycol and poly propylene glycol, 5 to 40% of an alcohol ethoxylate, and 2 to 20% of a copolymer of polyisobutylene and sodium polymaleate to the cellulosic furnish in an amount of from 0.01 to 10 lbs per ton of furnish solids and adding a cationic polyacrylamide papermachine drainage or strength aid to the cellulosic furnish in an amount of from 0.01 to 10 lbs per ton of furnish solids, allowing the cellulosic furnish to drain and forming an unbleached paper product.