Application of enzymes and flocculants for enhancing the freeness of paper making pulp
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United States of America Patent
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Dec 8, 1992
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N/A
app pub date -
Oct 7, 1991
filing date -
Oct 7, 1991
priority date (Note) -
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Abstract
A process for improving freeness of paper pulp which comprises these steps: a) Adding to the pulp at least 0.05% based on the dry weight of the pulp, of a cellulolytic enzyme; b) Allowing the pulp to contact the cellulolytic enzyme for at least 20 minutes at a temperature of at least 20.degree. C.; c) Adding at least 0.0007% based on the dry weight of the pulp of a water soluble cationic polymer, and then d) Forming the thus treated pulp into paper.
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