NOVEL METHODS FOR LABORATORY EVALUATION OF DEINKING SURFACTANTS

Two new laboratory methods for studying the process of ink separation from cellulose fibers are presented. A modified spinning drop tensiome ter can measure the interfacial tension between deinking surfactants a nd model inks within the time frame of the pulping stage. One-dimensio nal H-1 nuclear magnetic resonance imaging can measure the rate at whi ch model inks separate from cellulose fibers. Both methods show promis e as rapid screening tools for predicting the deinking effectiveness o f deinking surfactants.