Регулирование деформационных свойств бумаги путем варьирования степени ее анизотропии

УДК

676.017

DOI:

https://doi.org/10.37482/0536-1036-2021-5-174-184

Аннотация

Механические 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.

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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 авторах

Д. 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 слова

формование, динамический листоотливный аппарат, ориентация волокон, анизотропия, жесткость, прочность

Для цитирования

Rech 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: 10.37482/0536-1036-2021-5-174-184

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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

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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