NSSC pulp from planted populus and hardwood sawdust for flutting production
This research was performed with the goal of using neutral sulfite semi chemical pulp (NSSC) from populous instead of all or part of MWPI’s NSSC pulp for producing fluting paper. Firstly, NSSC pulp was prepared from populous species and hardwood sawdust under the mill’s cooking conditions. Then, the two mentioned pulp samples were replaced with the mill’s NSSC pulp in a variety of mixing ratios. Next, handsheets with 120 g/m2 were produced of mixed pulps and the properties were measured. The results showed that both raw materials could supply the pulp properties in acceptable way in comparison with control pulp (NSSC pulp of Mazandaran mill).
Non-Wood Fiber as an Alternative to Wood Fiber in Chinas Pulp and Paper Industry
Summary The pulp and paper industry in China has been growing rapidly as the nation's population and economy have grown. As a result, there has been a huge demand for pulp and paper raw materials. China has a long tradition for using non-wood raw materials for pulp and paper due to its limited forest resources and rich supply of agricultural residues and non-wood plants. Agricultural residues, such as rice straw and wheat straw, are traditional raw materials for China's paper industry. Massive plantation of bamboo provides an increasingly important source of raw material for pulp and paper. Problems with non-wood fiber include collection and transportation, storage and handling, washing, bleaching, papermaking, and chemical recovery. Small mills, primary users of non-wood fiber, are typically deficient in pollution control and subject to government closure. This paper reviews non-wood fibers commonly used in China's pulp and paper industry. By increased knowledge of use of non-wood fibers, wood suppliers can plan for access to the growing Chinese market.
Surfactant based digester additive technology for kraft softwood and hardwood pulping
A laboratory screening method, using an autoclave digester, has been developed for the evaluation of surfactants in kraft softwood and hardwood pulping. The effect of surfactants on cooking liquor penetration and diffusion has been explored. The use of surfactants results in a more uniform cook with lower Kappa numbers, lower screen rejects, lower pulp resin content, and improved black liquor residual active alkali content. The addition of 0.1% surfactant on o.d. wood resulted in a significant reduction of Kappa number with little loss of pulp yield. The resultant pulp yield at a constant Kappa number increased 0.5 to 1.0% over a conventional kraft cook. The laboratory results correlate very well with mill experience in screening additives for digester additive programs. Research proves that raising the Kappa number, with a surfactant, can boost wood yield. Kraft-surfactant pulping appears to be an appropriate technology in reducing screen rejects in combination with retrofitting oxygen delignification.