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Д. Рёч, А.Н. Поташева, Я. В. Казаков Рубрика: Химическая переработка древесины Скачать статью (pdf, 1.2MB )УДК676.017АннотацияМеханические свойства являются ключевыми при оценке качества бумаги и определяются прочностью и жесткостью межволоконных и межмолекулярных водородных связей. Вклад разных видов связей в прочность образца возможно менять регулированием степени анизотропии бумаги. Исследованы деформационные свойства лабораторных анизотропных образцов бумаги из беленой хвойной целлюлозы при степени помола 30 °ШР, массе 90 г/м2, со степенью анизотропии жесткости TSIMD/CD (отношение индексов жесткости при растяжении, TSIMD к TSICD) 1,75…4,08. Образцы были изготовлены на динамическом листоотливном аппарате TechPap SAS (г. Гренобль, Франция) при переменных параметрах отлива: скорости сетки, скорости струи, диаметре форсунки. Деформационные и прочностные свойства определены испытанием на растяжение с получением зависимости «напряжение–деформация». Показано, что увеличение степени ориентации волокна за счет варьирования параметров отлива делает прочность в машинном направлении больше на 55 %, жесткость при растяжении – на 63 %, снижает растяжимость на 10 %; в поперечном направлении возможно уменьшение жесткости при растяжении на 33 %, прочности – на 55 %, увеличение растяжимости на 5 %. Анизотропия прочности при растяжении составила 1,73…6,00. Наибольший эффект получен для модуля упругости в области предразрушения – 2,8…38,6, т. е. ориентация волокна имеет ключевое значение при больших деформациях образцов. Установленные количественные закономерности позволяют оптимизировать величины деформационных и прочностных показателей бумаги и их соотношение в машинном и поперечном направлениях за счет варьирования параметров отлива.Данная статья опубликована в режиме открытого доступа и распространяется на условиях лицензии Creative Commons Attribution» («Атрибуция») 4.0 Всемирная (CC BY 4.0) • Авторы заявляют об отсутствии конфликта интересов Сведения об авторахД. Рёч1, науч. сотр.А.Н. Поташева2, аспирант; ResearcherID: AAP-9396-2021, ORCID: https://orcid.org/0000-0002-8216-3844 Я.В. Казаков2, д-р техн. наук, проф.; ResearcherID: J-4634-2012, ORCID: https://orcid.org/0000-0001-8505-5841 1Techpap SAS, а/я 251, Седекс 9, г. Гренобль, Франция, 38044; e-mail: didier.rech@techpap.com 2Северный (Арктический) федеральный университет им. М.В. Ломоносова, наб. Северной Двины, д. 17, г. Архангельск, Россия, 163002; e-mail: a.romanova@narfu.ru; j.kazakov@narfu.ru Ключевые словаформование, динамический листоотливный аппарат, ориентация волокон, анизотропия, жесткость, прочностьДля цитированияRech D., Potasheva A.N., Kazakov Ya.V. Regulating the Deformation Properties of Paper by Varying the Degree of Its Anisotropy // Изв. вузов. Лесн. журн. 2021. № 5. С. 174–184. DOI: 10.37482/0536-1036-2021-5-174-184Литература1. Beloglazov V.I., Komarov V.I., Gurjev A.V. Anisotropy of Deformational and Strength Characteristics of Kraft-Liner. Lesnoy Zhurnal [Russian Forestry Journal], 2005, no. 5, pp. 113–118. URL: http://lesnoizhurnal.ru/upload/iblock/513/513fd048ed1675b4a8742e24cd337e24.pdf 2. Hansson M.T., Rasmuson A. Finite Element Analysis of Three Dimensional Fibre Networks. Nordic Pulp and Paper Research Journal, 2004, vol. 19, iss. 1, pp. 105–111. DOI: https://doi.org/10.3183/npprj-2004-19-01-p105-111 3. Horng A.J., Fletcher R.S., Mickleborough C.L., Sasaki K.R. A Novel Use of the Dynamic Sheet Former in Paper Recycling: Simulates the Function of New Recycling Devices. Pulp and Paper Canada, 1996, vol. 97, iss. 12, pp. 135–137. 4. Kazakov Y.V. Practice of Using of Deformation Characteristics for an Estimation of Paper and Cardboard Quality. The Issues in Mechanics of Pulp-and-Paper Materials: Proceedings of the 1st International Conference. Arkhangelsk, NArFU, 2011, pp. 88–94. 5. Kazakov Y.V. The Structure and Properties of Laboratory Anisotropic Samples of Pulp and Paper Materials. Tsellyuloza. Bumaga. Karton, 2013, no. 6, pp. 56–60. 6. Kazakov Y.V. Kinetics of Deformation of Pulp and Paper Materials at Tensile Test. The Issues in Mechanics of Pulp-and-Paper Materials: Proceedings of the 5th International Conference in Memory of Professor Valery Komarov. Arkhangelsk, NArFU, 2019, pp. 23–31. 7. Kazakov Y.V., Koncevaya V.I. Mechanics of Anisotropic Laboratory Hand-Made Samples of Pulp-and-Paper Materials. The Issues in Mechanics of Pulp-and-Paper Materials: Proceedings of the 2nd International Conference in Memory of Professor Valery Komarov. Arkhangelsk, NArFU, 2013, pp. 201–207. 8. Kazakov Y.V., Romanova A.N., Chukhchin D.G. Effect of Fiber Orientation Anisotropy on the Paper Deformation Properties. The Issues in Mechanics of Pulp-and-Paper Materials: Proceedings of the 3rd International Conference in Memory of Professor Valery Komarov. Arkhangelsk, NArFU, 2015, pp. 298–303. 9. Kazakov Ya.V., Komarov V.I. The Software of the Laboratory Test Complex for the Deformability and Strength Evaluation of Pulp and Paper Materials (KOMPLEX). Certificate of the Computer Software Official Registration No. 2001610526, 2001. 1 p. 10. Komarov V.I. Analysis of the Stress-Strain Relationship under Tensile Testing of Pulp and Paper Materials. Lesnoy Zhurnal [Russian Forestry Journal], 1993, no. 2-3, pp. 123–131. URL: http://lesnoizhurnal.ru/upload/iblock/ef4/123_130.pdf 11. Komarov V.I., Beloglazov V.I., Gurjev A.V., Sysoeva N.V. Study of the Factors Influencing the Anisotropy of Tensile Stiffness of Cardboard Liner. Tsellyuloza. Bumaga. Karton, 2005, no. 7, p. 48. 12. Komarov V.I., Kazakov Y.V. Analysis of Mechanical Behavior of Pulp and Paper Materials under Tensile Load. Lesnoy vestnik [Forestry Bulletin], 2000, no. 3(12), pp. 52–62. 13. Kulachenko A., Uesaka T. Direct Simulations of Fiber Network Deformation and Failure. Mechanics of Materials, 2012, vol. 51, pp. 1–14. DOI: https://doi.org/10.1016/j.mechmat.2012.03.010 14. Lindblad G., Fürst T. The Ultrasonic Measuring Technology on Paper and Board. Kista, Sweden, Lorentzen and Wettre, 2001. 98 р. 15. Mourad S., Skali-Lami S., Trehoult C. Instability of the Flow in a Closed Cylindrical Cavity and in a Short-Dwell Cavity. Coating Conference Proceedings. Toronto, 1999, pp. 447–455. 16. Romanova A.N., Kazakov Y.V. Measurement of Fiber Orientation Degree in Anisotropic Paper Structure. 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Economical Lab-Sheet Forming Methods. Proceedings of the European Conference on Pulp and Paper Research: The Present and the Future. Stockholm, 1996, pp. 179–185. 21. Zhang F.-D., Pei J.-C., Li J., Liu W., Zhou C.-X. The Effect of Speeds of Jet and Wire on the Physical Properties of Paper Sheets Forming in a Dynamic Sheet Former. China Pulp and Paper, 2014, vol. 33(6), pp. 25–30. Ссылка на английскую версию:Regulating the Deformation Properties of Paper by Varying the Degree of Its Anisotropy
REGULATING THE DEFORMATION PROPERTIES OF PAPER BY VARYING THE DEGREE OF ITS ANISOTROPY Didier Rech1, Researcher Anastasiia N. Potasheva2, Postgraduate Student; ResearcherID: AAP-9396 -2021, ORCID: https://orcid.org/0000-0002-8216-3844 Yakov V. Kazakov2, Doctor of Engineering, Prof.; ResearcherID: J-4634-2012, ORCID: https://orcid.org/0000-0001-8505-5841 1Techpap SAS, B.P. 251, Cedex 9, Grenoble, 38044, France; e-mail: didier.rech@techpap.com 2Northern (Arctic) Federal University named after M.V. Lomonosov, Naberzhnaya Severnoy Dviny, 17, Arkhangelsk, 163002, Russian Federation; e-mail: a.romanova@narfu.ru, j.kazakov@narfu.ru Abstract. Mechanical properties are crucial in assessing the paper quality. Deformation and strength properties of paper are determined by the strength and stiffness of the interfiber and intermolecular hydrogen bonds. The contribution ratio of interfiber and intermolecular hydrogen bonds to the strength of paper can be changed by adjusting the degree of its anisotropy. The article presents the results on a study of the deformation properties of laboratory anisotropic paper samples from kraft bleached softwood pulp with a beating degree of 30 °SR. The samples had basic weight of 90 g/m2 and the degree of stiffness anisotropy TSIMD/CD of 1.75–4.08. They were made by using Techpap SAS automatic dynamic handsheet former (Grenoble, France), with varying forming parameters – diameter of the nozzle, motion speed of the forming wire, and injecting speed of pulp. Deformation properties were determined by tensile test and processing of the stress-strain dependence (σ−ε). The outcomes have shown that, an increase of the fiber orientation degree in paper structure by changing the forming parameters caused a change in the nature of the paper deformation under tension. Increasing the fiber orientation degree in the structure of paper made it possible to increase the strength by 55 %, tensile stiffness by 63 % in the machine direction, while reducing the extensibility by 10 %. In the cross direction, it was possible to decrease tensile stiffness by 33 %, strength by 55 %, and increase the extensibility by 5 %. Anisotropy of tensile strength was 1.73–6.00. The greatest effect was obtained for the elasticity modulus in the pre-failure zone E2 (2.8–38.6). It means that, fiber orientation had a key importance when large deformations in the samples took place. The established quantitative regularities allowed optimizing the values of the deformation and strength properties of paper, and their ratio in the machine direction and cross direction due to the variation of the forming parameters. For citation: Rech D., Potasheva A.N., Kazakov Ya.V. Regulating the Deformation Properties of Paper by Varying the Degree of Its Anisotropy. Lesnoy Zhurnal [Russian Forestry Journal], 2021, no. 5, pp. 174–184. DOI: 10.37482/0536-1036-2021-5-174-184 Keywords: forming, FDA, fiber orientation, anisotropy, stiffness, strength This is an open access article distributed under the terms of the Creative Commons Attribution 4.0 International (CC BY 4.0) license • The authors declare that there is no conflict of interest |
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