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Du Y.-F.,China National Pulp and Paper Research Institute | Du Y.-F.,National Engineering Laboratory for Pulp and Paper | Zang Y.-H.,Tianjin University of Science and Technology
Chung-kuo Tsao Chih/China Pulp and Paper | Year: 2013

The migration of latex particles to the coating surface during consolidation was investigated, and a new mechanism based on Einstein classical particle diffusion theory and surface trapping effect was proposed to clarify the controversy in coating and related fields. X-ray photoelectron spectroscopy (XPS) technique was used to determine the elemental composition and content at the surface of coating comprised mainly of micron sized kaolin clay and sub-micron sized styrene butadiene latex, and regression equation was established between surface atomic concentration and latex amount in the formulation. By converting the surface XPS results of coatings dried under various conditions to latex content using the above equation, the effect of various factors on the degree of latex particles migration was analyzed quantitatively for the first time. The results showed that latex migration to coating surface can be promoted by increasing drying temperature and drying time, and decreasing the initial solid content of coating colors, while impeded by raising its particle size, the substrate absorption, initial solids content and viscosity of coating colors, and therefore the new mechanism was verified. Source


Lei L.,China National Pulp and Paper Research Institute | Lei L.,National Engineering Laboratory for Pulp and Paper | Feng W.-Y.,China National Pulp and Paper Research Institute | Feng W.-Y.,National Engineering Laboratory for Pulp and Paper
Chung-kuo Tsao Chih/China Pulp and Paper | Year: 2015

The various ONP pulp and their deinked pulp after flotation and washing were used as materials to prepare the sheets by laboratory sheet former (whether cover a cloth or not) and Buchner funnel respectively. And the optical properties of the sheets were analyzed, and the effects of sample sheet preparing methods on optical property determination were evaluated. The results showed that the sheet prepared in Buchner funnel with better retention of fillers, inks and other fine materials in the filter paper, it caused great difference of optical property comparing with other sample sheet preparing methods. While there were a little fillers, inks and fine materials in deinked pulp, the effect of sample sheet preparing methods on brightness and ERIC (Effective Residual Ink Concentration) determinate was not obvious. On the contrary, the pulp contained more fine materials and inks, there were obvious differences in brightness and ERIC of the sheets prepared by different methods, especially between the sheets prepared by laboratory sheet former and Buchner funnel. © 2015, China National Pulp and Paper Research Institute (CNPPRI). All right reserved. Source


Lei L.,China National Pulp and Paper Research Institute | Lei L.,National Engineering Laboratory for Pulp and Paper | Feng W.-Y.,China National Pulp and Paper Research Institute | Feng W.-Y.,National Engineering Laboratory for Pulp and Paper
Chung-kuo Tsao Chih/China Pulp and Paper | Year: 2014

This paper introduced the printing methods of newspaper, composition of the different printing inks and their deinkability. With the increasing of the proportion of flexographic(water-based inks) printed paper, the negative effects on waste newspaper deinking increased, this paper focused on the deinking chemicals, deinking process, treatment of deinking effluent and evaluation methodology of deinking efficiency of old newspaper printed with water-based inks. Moreover, some suggestions to old newspaper deinking process were put forward. Source


Duan C.,China National Pulp and Paper Research Institute | Duan C.,National Engineering Laboratory for Pulp and Paper | Feng W.-Y.,China National Pulp and Paper Research Institute | Feng W.-Y.,National Engineering Laboratory for Pulp and Paper | And 5 more authors.
Zhongguo Zaozhi Xuebao/Transactions of China Pulp and Paper | Year: 2013

Based on the concept of biorefinery in pulp and paper industry, pre-extracting hemicelluloses sugars from poplar chips via autohydrolysis was carried out , and then the extracted chips were used for the kraft pulping. The influence of P-factor on pre-hydrolysis and subsequent kraft pulping were investigated. The results indicated that autohydrolysis is a satisfactory process for pre-extracting hemicelluloses, and the autohydrolysis process can be well controlled by the P-factor. Besides, autohydrolysis treatment can significantly improve the deligninfication efficiency in subsequent kraft pulping, decrease the EA charge at the sacrifice of the beatability of the pulp and some physical properties of the paper. Considering the subsequent biomass utilization of pre-hydrolysis and pulping performance of the treated wood chips, the P-factor of autohydrolysis is controlled in the range from 608 to 1060, which the extraction rate of pentosan in pre-hydrolysate is from 33.18% to 35.31% and the yield of the kraft pulp is from 39.47% to 37.12%. Compared with the control sample, the properties of the kraft pulp and the pulping black liquor of the pre-hydrolysis treated sample are better at the reasonable P-factor. Source


Huang X.-L.,China National Pulp and Paper Research Institute | Huang X.-L.,National Engineering Laboratory for Pulp and Paper | Liu W.,China National Pulp and Paper Research Institute | Liu W.,National Engineering Laboratory for Pulp and Paper | And 5 more authors.
Chung-kuo Tsao Chih/China Pulp and Paper | Year: 2013

As the growth of anti-smoking wave and more and more attention has been attracted to the influence of smoking on health, paper cigarette filter presents significant effectiveness in removal of tar in tobacco smoke, more biodegradable and at lower cost compared with traditional acetate fiber cigarette filter, and it becomes the research hotspot recently. But paper cigarette filter also has some obvious disadvantages that hinder its promotion and development seriously. In this paper, the main disadvantages of paper cigarette filter and its causes were analyzed, and the technology and research progress in eliminating or reducing the disadvantages of paper cigarette filter was reviewed in detail. Source

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