W Thomas Gauld, Ronald Visser, Arthur V Jepsen: Method for screening pulp. Gauld Equipment Company, Needle & Rosenberg P C, February 11, 1997: US05601690 (40 worldwide citation)

A method for screening fibrous stock slurry having a rotor impeller and a screen, in which accepts quality and throughput may be adjusted without stopping the screening process by relative displacement of the clearance between the rotor and the screen plate. In one version, this relative displacemen ...

James H Payton: Pitch control method. Nalco Chemical Company, John G Premo, Robert A Miller, January 22, 1980: US04184912 (30 worldwide citation)

Pitch formation in paper mill pulp systems may be inhibited by treating such systems, at a point prior to where pitch deposits normally occur, with at least 0.5 ppm, based on the weight of the pulp, of a composition comprising:

Shafi U Hossain, Carol A Blaney: Method for removing stickies from secondary fibers using supercritical CO.sub.2 solvent extraction. Kimberly Clark Corporation, William D Herrick, April 23, 1991: US05009746 (24 worldwide citation)

A process for removing sticky contaminants ("stickies") from cellulose-containing fibers such as waste paper is provided. The process comprises contacting the fibers with supercritical or near supercritical carbon dioxide for a period of time sufficient to extract a substantial portion of the sticki ...

Theodora Retsina, Vesa Pylkkanen: Method for the production of fermentable sugars and cellulose from lignocellulosic material. American Process, Altera Law Group, October 4, 2011: US08030039 (22 worldwide citation)

A method for the production of fermentable sugars and high viscosity cellulose from lignocellulosic material in a batch or continuous process is provided. Lignocellulosic material is fractionated in a fashion that cellulose is removed as pulp, cooking chemicals can be reused, lignin is separated for ...

Robert D Moreland: Detackification of adhesive materials contained in secondary fiber with polyvinyl alcohol. Betz Laboratories, Alexander D Ricci, Gregory M Hill, December 12, 1989: US04886575 (22 worldwide citation)

The invention is directed to the use of polyvinyl alcohol to control the problem of "stickies" in waste paper processing.

Pierre Lamort: Method and device for preparation and primary separation of paper pulp. E et M Lamort, Darby and Darby, April 4, 1989: US04818339 (19 worldwide citation)

Method and device for preparation and primary separation of paper pulp in which the initial disintegration is produced in a primary pulper 1 of known type, the contents of the pulper, after this separation is discharged directly and discontinuously into a large-sized vat where it is stirred by an ag ...

Thomas J Drennen, Robert A Gill: Process for controlling pitch in papermaking. Rohm and Haas Company, February 26, 1980: US04190491 (19 worldwide citation)

A process for preventing deposition of pitch in papermaking comprising incorporating in a paper pulp slurry a water-soluble linear cationic polymer comprised of units of the formula ##STR1## wherein A is a (C.sub.2 -C.sub.3) alkylene group,

Jonas A Lindahl: Process for producing high yield bleached cellulose pulp. Mo och Domsjo, October 11, 1988: US04776926 (17 worldwide citation)

A process is provided for producing high yield bleached cellulose pulp, such as groundwood pulp, thermomechanical pulp, chemimechanical pulp and waste paper pulp, having a broad field of use, which comprises bleaching cellulose pulp, thinning the pulp to a low pulp consistency; mechanically working ...

Gay M Jividen, Hou Min Chang, R Heath Reeves, Chen Loung Chen: Process for obtaining seed hull commodities including cellulosic fibers and xylitol. Cotton Incorporated, Burns Doane Swecker & Mathis, May 2, 1978: US04087316 (17 worldwide citation)

Cellulosic fibers are removed from seed hulls such as cottonseed hulls by a process including (a) in the absence of mechanical action sufficient to cause degradation of fiber properties, contacting the seed hulls which comprise both cellulosic fibers (linters and hull fibers) and non-fibrous hull co ...

John Anthony Hyatt, Richard William Fengl, Kevin Joseph Edgar, Maria Teresa Alvarez Wright: Process for the co-production of dissolving-grade pulp and xylan. Eastman Chemical Company, Michael J Blake, Harry J Gwinnell, May 2, 2000: US06057438 (15 worldwide citation)

Disclosed is a process for upgrading paper-grade wood pulp to dissolving grade pulp which is suitable for use in the preparation of viscose rayon, cellulose ethers and cellulose esters such as cellulose acetate. The process utilizes a sequence of caustic extraction, xylanase treatment and caustic ex ...