Patent ID: 8454798

Claim:
A method of making paper or paperboard comprising: a) applying a composition comprising enzyme and cationic coagulant to a paper making pulp to form a treated pulp, wherein said composition is added in a paper making process to the paper making pulp after a white water silo and prior to at least one of a fan pump, a screen, and a head box from which filtrate drained from pulp is recirculated to said white water silo, wherein the composition comprises from about 1% by weight to about 99% weight enzyme and from about 99% by weight to about 1% by weight cationic coagulant, on a dry solids weight basis, and the composition is added to the pulp in an amount of from 0.5 pound per ton to 10 pounds per ton based on the dried solids weight of the pulp; and b) forming the treated pulp into paper or paperboard, wherein pulp temperatures of the treated pulp during at least substantially an entire time of contact of the composition with the pulp is maintained at from about 30° C. to about 60° C. and the time of contact is from about 1 minute to about 150 minutes.