Paper Making Processes and System Using Enzyme and Cationic Coagulant Combination
AssigneeBuckman Laboratories International, Inc.
InventorsWeiping Ban, Gary Headrick, Rosa M. Covarrubias
Life of this patent
Estimating the term…
Abstract
A method is described for making paper or paper board by applying a composition containing enzyme and cationic coagulant to papermaking pulp prior to paper forming to preferably improve drainage, retention, or both. Sheets of pulp from which paper or paperboard products are made with the method can exhibit excellent drainage, excellent retention of pulp fines, or both. The method also can be applied to other pulp treatments, such as waste water treatments. A system for making such treatments of paper furnish is also provided.
Claims20
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;
- and
- b) forming the treated pulp into paper or paperboard.
A papermaking system comprising a supply of papermaking pulp, a processing unit for forming the pulp into a paper or paperboard comprising a screen for collecting pulp and a paper sheet forming processing unit receiving pulp from the screen, a supply of a composition comprising an aqueous dispersion of enzyme and cationic coagulant and a composition feeding device for feeding the composition to the pulp for application thereto prior to paper forming, and a supply of flocculant and a flocculant feeding device for feeding the flocculant to the treated pulp downstream from where the enzyme and cationic coagulant composition is applied to the pulp, and a white water silo for white water recirculation.
Dependencies are inferred from the claim text.