Method for modifying papermaking sludge and products made from modified papermaking sludge
AssigneeKimberly-Clark Worldwide, Inc.
InventorsJames Jay Tanner, David Henry Hollenberg
Life of this patent
Estimating the term…
Abstract
Papermaking sludge can be modified to a modeling clay-like consistency by the addition of one or more dispersing agents, such as polyacrylamide. The modified papermaking sludge can be formed into a number of useful products, such as paper sheets or extruded products.
Claims21
A method of modifying papermaking sludge comprising adding from about 0.5 to about 20 weight percent of a dispersant to the papermaking sludge and mixing the dispersant and the papermaking sludge until the rheology of the mixture is substantially the same as that of modeling clay.
A method of making a paper sheet comprising:
- (a) combining papermaking sludge with a dispersant;
- (b) mixing the papermaking sludge and the dispersant;
- (c) forming the mixture of papermaking sludge and dispersant into a sheet;
- and (d) drying the sheet.
A modified papermaking sludge composition comprising from about 5 to about 60 weight percent cellulose fibers and fiber fragments (fines), from about 10 to about 50 weight percent inorganic material, from about 0.5 to about 20 weight percent dispersant, and from about 30 to about 70 weight percent water.
A modified papermaking sludge comprising from about 0.5 to about 20 dry weight percent of a dispersant, said modified papermaking sludge having a tensile strength of about 5 kilopascals or greater.
A dry paper sheet comprising from about 5 to about 40 weight percent cellulose fibers and fiber fragments, from about 5 to about 30 weight percent clay, from about 5 to about 30 weight percent calcium carbonate and from about 1 to about 30 weight percent dispersant.
Dependencies are inferred from the claim text.