Methods to control organic contaminants in fibers
AssigneeBuckman Laboratories International, Inc.
InventorsDaniel E. Glover, Percy Jaquess, James W. Fitzhenry
Life of this patent
Estimating the term…
Abstract
Methods to control organic contaminants in fibers are described. One method involves contacting the fibers with a composition containing at least one esterase or lipase or both for a sufficient time and in a sufficient amount to control the organic contaminants present in the fibers. Preferably, the fibers are recycled fibers originating from a variety of sources such as old corrugated containers, old newsprint, mixed office waste, and the like. Resulting paper products formed from the processed fibers are also described as well as methods to make them.
Claims25
A method to control organic contaminants present in recycled fibers containing organic contaminants comprising contacting said recycled fibers with a composition comprising at least one esterase that is not a lipase, for a sufficient time and in a sufficient amount to control the organic contaminants present in the recycled fibers, wherein said organic contaminants comprise synthetic polymers, adhesives, glues, hot-melts, coatings, coating binders, de-inking chemicals or combinations thereof.
A method of making paper or paperboard products comprising:
- forming a pulp slurry comprising at least fibers obtained from recycled paper or paperboard;
- treating said fibers with a composition comprising at least one esterase that is not a lipase, or both for a sufficient time and in a sufficient amount to control organic contaminants present in the fiber;
- and
- forming, in the absence of a flotation stage, said fibers treated with said composition into paper or paperboard products.
Dependencies are inferred from the claim text.