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Advanced wet-end system with carboxymethyl-cellulose.

APPLICATION: Treating pulp fiber with CMC could reduce the dosage levels of wet-end additives, resulting in a cleaner mill system, improved quality, and increased economic efficiency.

We developed a novel and practical method to greatly enhance the efficacy of wet-end chemicals. It involves the adsorption of carboxymethyl-cellulose (CMC) onto pulp. Investigation showed that paper made from CMC-treated pulp required as much as 30% to 50% less wet-end additives than usual to obtain the desired quality when compared to paper made from non CMC-treated pulp. Furthermore, the study identified both the degree of substitution of CMC and electrical conductivity of the pulp slurry as key variables critical to CMC adsorption onto pulp. Improved fiber charge distribution, which facilitates improved wet-end additive distribution, is believed to be the main reason for the synergy seen when CMC is used in conjunction with wet end applications. Results of laboratory investigations and development of CMC application were effectively reproduced in mill trials. View this paper online at http://www.tappi.org/index.asp?pid=29256

Masasuke Watanabe, Tomohisa Gondo, and Osamu Kitao are with the Pulp and Paper Research Laboratory. Oji Paper Co, Ltd., 1-10-6 Shinonome, Koto-ku, Tokyo 135-8558. Japan. Email Gondo at tomohisa-gondo@ojipaper.co.jp
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Title Annotation:Wet-end Additives
Author:Kitao, Osamu
Publication:Solutions - for People, Processes and Paper
Date:May 1, 2004
Words:202
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