Kraft pulp structural and morphological property changes produced from refined introduced Lodgepole pine wood

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Modification features in the structural and dimensional properties of kraft unbleached pulp obtained from Lodgepole pine (Pinus contorta var. latifolia Engelm) were identified and analyzed under laboratory standardized refining conditions of up to 60 SR at the Yokro mill. Measurements were carried out using an automatic fiber analyzer L&W Fiber Tester. Pulp fibers for board production (Kappa number 56), compared to pulp for subsequent bleaching and papermaking (Kappa number 25), are longer (2,1 mm versus 1,9 mm), wider (31,4 mm versus 30,1 µm), less curved (shape factor 89,2 versus 82,1) and have fewer fractures per 1 mm (0,28 versus 0,81). Lodgepole pine pulp has high resistance to refining and requires increased energy consumption for refining. The nature of changes in the fractional composition along the length, width and fiber shape factor, as well as the structural and dimensional properties of lodgepole pine cellulose depends fundamentally on the lignin content. Fibers with a low lignin content are more easily destroyed at defect sites, and the remaining fragments have increased straightness. As a result, the refining effect changes from predominant fibrillation and a slight increase in fines for cellulose fibers for cardboard, to predominant chopping of fibers, which passes mainly along the sections of the cell wall weakened by fractures, and the previously bent end sections of the fibers are torn off. At the same time, the rate of decrease in fiber length increases, and the direction of change in the structural and dimensional properties during refining changes, the content of fines, the number of breaks per fiber and the average length of the segment change in different directions. The differences in fiber properties measured on the automatic fiber analyzer L&W Fiber Tester are characterized in pulp samples with high (Kappa number 56) and low (Kappa number 25) lignin content. It has been shown that with a decrease in the lignin content in pulp, the average fiber length decreases from 2,1 to 1,9 mm, the average width from 31,4 to 30,1 µm, the form factor from 89,2 to 82,1 %, and the number of kinks per 1 mm increases from 0,28 to 0,81. It was revealed that the nature of the change in the fractional composition by length, width and fiber shape factor, as well as the structural and dimensional properties of pulp from lodgepole pine during refining depends fundamentally on the lignin content. It has been established that fibers with a low lignin content are more easily destroyed when refined at defect sites, and the remaining fragments have increased straightness. The change in the milling effect is shown from predominant fibrillation and a slight increase in fines for fibers with a high lignin content to predominant chopping of fibers with a low lignin content. With a decrease in lignin content, the rate of decrease in fiber length during refining increases, and the direction of change in structural and dimensional properties changes.

About the authors

Yakov V. Kazakov

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

Author for correspondence.
Email: j.kazakov@narfu.ru

Dr. Sci. (Engineering) Professor of the Department of pulp and paper and wood chemical production, of the Higher School of Natural Sciences and Technologies

Russian Federation, 17, Naberzhnaya Severnoy Dviny st., 163002, Arkhangelsk

Nikolay A. Babich

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

Email: n.babich@narfu.ru

Dr. Sci. (Agriculture), Professor of the Department of Landscape Architecture and Artificial Forests of the Higher School of Natural Sciences and Technologies

Russian Federation, 17, Naberzhnaya Severnoy Dviny st., 163002, Arkhangelsk

Natal’ya A. Krushevskaya

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

Email: n.krushevskaya@narfu.ru

Master student of the Department of the Department of pulp and paper and wood chemical production, of the Higher School of Natural Sciences and Technologies

Russian Federation, 17, Naberzhnaya Severnoy Dviny st., 163002, Arkhangelsk

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