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US 7,125,471 B2Granted
Papermaking process using enzyme-treated sludge, and products
AssigneeBuckman Laboratories International, Inc.
InventorsWalter B. Hill, Jr., Brian G. Hart, Lowell F. Lott, Robert J. Turnbull, James W. Fitzhenry, Daniel E. Glover, Philip M. Hoekstra
Life of this patent
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Abstract
Enzyme-treated papermaking sludges are provided, as are methods of making the enzyme-treated sludge. Papermaking processes that incorporate the enzyme-treated papermaking sludges into papermaking pulp are also provided as are paper and paperboard products made from the resultant pulp.
Claims15
A method of improving sizing in a paper or paperboard product, comprising:
- combining a papermaking sludge with an enzyme composition to form an enzyme-treated sludge;
- combining said enzyme-treated sludge with a papermaking pulp to form a treated pulp;
- and
- forming a paper or paperboard product from said treated pulp, wherein said product has improved sizing compared to the sizing of an identical paper or paperboard product but not having the sludge treated with enzyme composition,
- wherein said enzyme composition comprises at least one polyamide oligomer and at least one cellulytic enzyme.
2 more elements
A method of improving sizing in a paper or paperboard product, comprising:
- combining a papermaking sludge with an enzyme composition to form an enzyme-treated sludge, wherein said enzyme composition comprises at least one of a protease, an esterase or a lipase;
- combining said enzyme-treated sludge with a papermaking pulp to form a treated pulp;
- and
- forming a paper or paperboard product from said treated pulp, wherein said product has improved sizing compared to the sizing of an identical paper or paperboard product but not having the sludge treated with enzyme composition.
1 more element
Dependencies are inferred from the claim text.