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Kuang S.-J.,China National Pulp and Paper Research Institute
Chung-kuo Tsao Chih/China Pulp and Paper | Year: 2013

Ozone bleaching development trend, ozone HC bleaching and MC bleaching processes, operation parameters of ozone bleaching and the advantages of using ozone bleaching are reviewed briefly in this paper. It concluded that ozone ECF-light should be the priority choice for the bleaching process which will copes with the more strict effluent discharge regulation.

Li W.-L.,China National Pulp and Paper Research Institute
Chung-kuo Tsao Chih/China Pulp and Paper | Year: 2011

The energy consumption of paper industry in China and the developed countries was compared simply. The energy saving measurements from the aspects of structure adjustment, energy saving technology and energy saving management were discussed.

Miao Q.,Fujian Agriculture and forestry University | Miao Q.,University of New Brunswick | Chen L.,Fujian Agriculture and forestry University | Huang L.,Fujian Agriculture and forestry University | And 4 more authors.
Bioresource Technology | Year: 2014

The commercial pre-hydrolysis kraft-based dissolving pulp production process can be a typical example for the demonstration/implementation of the integrated forest biorefinery concept. In this study, the concept of cellulase treatment of this dissolving pulp for enhancement of accessibility/reactivity in terms of viscose rayon production was demonstrated. The cellulase treatment resulted in the formation of additional openings/surface areas in the fiber structure via the possible action of "etching". As a result, the pore volume of pulp fibers increased, which led to the increase in the accessibility to xanthation, and thus Fock reactivity. Results showed that the cellulase treatment was effective in increasing the Fock reactivity, at a cellulase dosage of 2. u/g (based on the dry weight of pulp), the Fock reactivity increased from 47.67% to 79.9%. The adoption of cellulase treatment to hardwood kraft-based dissolving pulp can provide an efficient approach for enhancing its performance in the commercial viscose-rayon process. © 2013 Elsevier Ltd.

Du Y.,China National Pulp and Paper Research Institute | Zang Y.-H.,Tianjin University of Science and Technology | Sun J.,Tianjin University of Science and Technology
Progress in Organic Coatings | Year: 2014

The consolidation process of wet paper coating layers has been generally divided into several stages by the definitions of first critical concentration (FCC) and second critical concentration (SCC), however few works have been done on the kinetics of water expelled during drying and its influence on the critical concentrations. In this paper, the effects of three kinds of water soluble polymers, i.e., carboxymethyl cellulose (CMC), polyvinyl alcohol (PVA) and modified coating starch, on the consolidation of model kaolin clay-latex coatings were investigated. On-line water evaporation loss rate, together with the level of FCC and time needed to reach FCC, was characterized. The results showed that water evaporation loss weight increased almost linearly with drying time during the initial wet coating layer consolidation stage. On-line water evaporation rate and the value of FCC decreased with water soluble polymers addition, while the time needed to reach FCC became longer. Among the three polymers studied, CMC was the most effective, then PVA and starch. © 2014 Elsevier B.V.

Kuang S.-J.,China National Pulp and Paper Research Institute
Chung-kuo Tsao Chih/China Pulp and Paper | Year: 2010

Some energy saving technologies, which have been used or have application potential in pulp and paper industry, were briefly introduced.

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