The Effect of Fiber Brushing and Shortening when Beating on the Strength, Deformation and Fracture Toughness Properties of Cellulosic Materials

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UDС

676.054.6

DOI:

10.17238/issn0536-1036.2018.2.109

Abstract

Beating of fibrous materials is one of the key stages of plant fibers processing in order to obtain paper-forming properties. When beating plant fibers in an aqueous medium we can observe two main processes: a purely mechanical (fiber shortening and longitudinal splitting into fibrils) and colloid-chemical (fiber swelling and hydration). The goal of research is to study the effect of the preferential shortening or fibrillating beating simulated in laboratory conditions on the strength and deformation characteristics of fibrous semifinished products. A preferential shortening of fibers occurs when thin stock beating and each fiber entering between the knives of the beater has a higher specific pressure. To obtain highly fibrillated fibers, by contrast, thick stock should be subjected to beating, and each fiber comes under minimal specific pressure and a greater mutual frequency of fibers, which facilitates their combing and splitting. Simulation of shortening or fibrillating beating at different mass con-centration is conducted in laboratory conditions using three types of beaters ‒ laboratory beating engine, Jokro mills and PFI. The study subjects are the samples of coniferous un-bleached high-yield and average-yield pulp. The paper demonstrates the possibility of simu-lation of fiber preferential shortening or fibrillation under circumstances of laboratory beat-ing. This allows purposefully modifying papermaking characteristics of fibers and obtaining a paper sheet with desired application properties.

Authors

V.V. Gorazdova¹, Postgraduate Student
E.V. Dernova¹, Candidate of Engineering Sciences, Associate Professor
D.A. Dul'kin², Doctor of Engineering Sciences, General Director
E.O. Okulova¹, Postgraduate Student

Affiliation

¹Northern (Arctic) Federal University named after M.V. Lomonosov, Naberezhnaya Severnoy Dviny, 17, Arkhangelsk, 163002, Russian Federation; е-mail: v.gorazdova@narfu.ru, e.dernova@narfu.ru, e.okulova@narfu.ru
²United Paper Factories, ul. Trudovaya, 2, Polotnyanyy Zavod village, Dzerzhinskiy district, Kaluga region, 249844, Russian Federation; e-mail: dmdulkin@yandex.ru

Keywords

beating, brushing, shortening, high-yield pulp, average-yield pulp, strength, de-formability, fracture toughness

For citation

Gorazdova V.V., Dernova E.V., Dul'kin D.A., Okulova E.O. The Effect of Fiber Brushing and Shortening when Beating on the Strength, Deformation and Fracture Toughness Properties of Cellulosic Materials. Lesnoy zhurnal [Forestry journal], 2018, no. 2, pp. 109–121. DOI: 10.17238/issn0536-1036.2018.2.109

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Received on October 24, 2017