Betz Paperchem, Inc.

Betz Laboratories, Inc.

Michael A Schuster

John C Harrington, Iv

Alan J Schellhamer

Thomas E Taggart

Fu Chen

Wen P Liao

David D Dreisbach

Mary Beth Letscher

Frank J Sutman

Gilbert S Gomes

Gregory E Doll

John T Lin

Richard A Hobirk

Irenee J Philippe

Medical tube retention device

The present invention is directed to a method for increasing the retention on a washing/thickening device in an aqueous papermaking system. The method generally comprises adding to the furnish solids of the system an effective amount of a cationic polyacrylamide polymer.

Use of polymers in the recycled fiber washing/deinking process

A composition and method for improving the drainage and retention characteristics of a paper furnish consisting of a water soluble graft copolymer and bentonite clay. It is preferred that the graft copolymer be added to the furnish prior to at least one shear stage and that the bentonite clay be added after the shear stage.

Method for improving retention and drainage characteristics in alkaline

A method of improving the drainage characteristics of a pulp slurry in a papermaking operation utilizing the sequential steps of adding alum, ionic polyacrylamide and cationic starch. The cationic starch can be added to the slurry prior to or after the primary screen.

An apparatus and method to simultaneously evaluate the drainage, retention and formation characteristics of paper pulp comprising mixing the paper pulp furnish in the top chamber of the apparatus, releasing the furnish into a middle chamber via a valve having a cone shaped structure for even distribution of the furnish onto a wire screen, and utilizing a time delay before opening a vent valve in order to attenuate impingement forces. The apparatus utilizes a rotating blade under the wire screen to duplicate the pulsation forces of full scale papermaking equipment, an externally applied means to assist in the removal of water similar to a paper machine couch roll. Data generated during the foregoing steps is fed into a computer to evaluate the entire free water drainage process of the furnish. The device is able to set parameters to simulate the water removal process on most paper machines via level control and duration of pertinent variables.

Apparatus for simulating processing parameters and predicting variables

The present invention is directed to a paper having improved properties, a process of producing the paper, and compositions used in the process of producing the paper. The invention generally comprises using a cationic starch in combination with a naturally anionic polysaccharide gum.

Papermaking using cationic starch and naturally anionic polysacchride

A process of making paper by forming a paper furnish comprised of cellulosic fibers or cellulosic fibers and mineral filler material suspended in water, depositing the furnish on a papermaking wire, and forming a sheet out of the solid components of the furnish while carried on the wire, the improvement wherein there is mixed into the furnish, prior to its being deposited on the wire, about 0.50 to 5 percent of cationic starch (based on the dry weight of total solids in the furnish) followed by about 5 to 20 percent of a water soluble carboxymethyl) cellulose (based on the weight of the cationic starch).

Papermaking using cationic starch and carboxymethyl cellulose or its

The invention relates to a process for controlling pitch deposition from pulp in papermaking systems which comprises adding to the pulp an effective amount of a water-soluble quaternized polyamine ionene polymer.

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Jacksonville, FL, United States of America

Michael A Schuster