Advanced wet-end system with carboxymethyl-cellulose

Abstract

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 up to 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.