On the Possibility of Using Dying Spruce for Production of High Yield Bisulphite Pulp

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676.032

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Abstract

dead spruce will allow us to make a more objective assessment of the possible use of defective wood from mature and overmature spruce forests of the European North in the pulp and paper industry. At present, the volume of damaged wood is estimated at 150 million m3. As raw materials for the experiment we used industrial chips of dying, dead and normal spruce. Pulp samples were cooked in the laboratory. Grinding and refining of pulp were carried out in the centrifugal grinding machine in the laboratory. Semi-products were obtained and their quality was evaluated by standard methods. Geometrical dimensions of fiber were determined using the FiberTester analyzer. Deformation behavior and a number of strength properties were determined by the techniques developed in NArFU. The chemical analysis of dying, dead and normal wood samples indicates that dying wood has significant changes only in the content of extractives. Lignin content is higher in the upper part of healthy wood, while in the butt its content is almost unchanged. The content of easily hydrolyzed polysaccharides in normal wood is 3 % higher in the top part of the trunk and 4 % higher in the butt, as compared to dying and dead spruce. The maximum content of hard-to-hydrolyze polysaccharides was found in dying wood, increasing in the direction of the butt.The pulp yield from normal wood differed significantly from that of defective wood. Whereas the difference between the yields from normal and dying wood is about 10 % along the full length of the trunk, the difference between the yields from normal and dead wood is 12 %. The Kappa number of the pulp samples varies slightly. From the data obtained it may be concluded that the use of dead and dying spruce wood to produce bisulphite pulp is less cost effective due to the substantial difference in the yield of semi-finished products.

Authors

Yu.V. Sevastyanova, Candidate of Engineering, Associate Professor ;N.N. Fetyukova, Postgraduate Student ;I.M. Nevzorova, Postgraduate Student Northern (Arctic) Federal University named after M.V. Lomonosov

Naberezhnaya Severnoy Dviny, 17, 163002, Arkhangelsk, Russia E-mail: y-sevastyanova@yandex.ru

Affiliation

Northern (Arctic) Federal University named after M.V. Lomonosov

Keywords

dead spruce, high yield bisulphite pulp, structural-dimensional characteristics of fiber, standard strength characteristics of high yield pulp.

References

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