Process for enhancing the freeness of papermaking pulp

Details Process for enhancing the freeness of papermaking pulp Process for enhancing the freeness of papermaking pulp

1995-06-07

1996-04-16

Chin, Peter

Paper making and fiber liberation

Processes and products

162158, 1621682, 1621683, 162182, 162183, 162 9, D21H 2110

Patent

active

055079148

ABSTRACT:
A process for enhancing the freeness of paper pulp, which comprises the steps of adding to the pulp from about 0.5 to about 2.5 kilograms per ton based on the dry weight of the pulp, of a cellulolytic enzyme at the vertical tank of the papermaking process, allowing the pulp to contact the cellulolytic enzyme for from about 30 minutes to about 60 minutes, adding at least 0.011%, based on the dry weight of the pulp, of a water soluble cationic polymer, adding at least 0.007%, based on the dry weight of the pulp, of a water soluble anionic polymer and forming the thus treated pulp into paper.

REFERENCES:
patent: 3406089 (1968-10-01), Yerkes
patent: 4923565 (1990-05-01), Fuentes
patent: 5169497 (1992-12-01), Sarkar
patent: 5308449 (1994-05-01), Fuentes
Eriksson, "Swedish Developments in Biotechnology Related to the Pulp and Paper Industry", TAPPI Journal, vol. 68, No. 7 (Jul. '85) pp. 46-55.

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