PRINCIPAL PROPERTIES OF SECONDARY FIBERS OBTAINED BY WET-STRENGTH PAPER REPULPING

UDC 676.038:676.017.44

  • Penkin Anton Anatolʼyevich − PhD (Engineering), Associate Professor, Assistant Professor, the Department of Chemical Wood Processing. Belarusian State Technological University (13a, Sverdlova str., 220006, Minsk, Republic of Belarus). E-mail:penkin@belstu.by

  • Kazakov Yakov Vladimirovich – DSc (Engineering), Professor, Professor, the Department of Pulp and Paper and Wood Chemical Production. Northern (Arctic) Federal University named after M. V. Lomonosov (17, Severnaya Dvina emb., 163002, Arkhangelsk, Russian Federation). E-mail:j.kazakov@narfu.ru

DOI: https://doi.org/10.52065/2520-2669-2022-253-1-80-88

Key words: wet-strength paper, repulping, secondary fibers, principal properties.

For citation: Penkin A. A., Kazakov Ya. V. Principal properties of secondary fibers obtained by wet-strength paper repulping. Proceeding of BSTU, issue 2, Chemical Engineering, Biotechnologies, Geoecology, 2022, no. 1 (253), pp. 80–88 (In Russian). DOI: https://doi.org/10.52065/2520-2669-2022-253-1-80-88.

Abstract

Wet-strength recovered paper, due to the continuous growth of economic, social and environmental significance of its recycling, is becoming an important source of secondary fiber. Repulping of wetstrength paper, as the primary stage of its recycling process, has a number of features in comparison with ordinary recovered paper: a much longer repulping time, higher temperature and pH, the usage of oxidizing reagents. The special conditions for the repulping of wet-strength paper affect the principal properties of the secondary fibers that determine their papermaking potential. In this regard, the article contains a comprehensive assessment of the 5 principal properties of secondary fibers obtained by repulping of wetstrength paper from bleached softwood kraft pulp.

The results showed that the values of average fiber length (Ln, Ll, Lw, Lv) were almost indifferent in relation to 2–3 times shortening of wet-strength paper repulping time due to the application of sodium persulfate or potassium monopersulfate. It was found that intrinsic strength of the secondary fibers obtained by fast oxidizeralkaline repulping at 24°SR is on average 11% higher than the strength of fibers obtained by long alkaline repulping. At the same time, the wet fiber compactability and the fiber cohesiveness decreased insignificantly (5 and 8%, respectively), while the coarseness of fibers increased from 171 to 193–213 mg/m.

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