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<article xmlns:mml="http://www.w3.org/1998/Math/MathML" xmlns:xlink="http://www.w3.org/1999/xlink" xmlns:xsi="http://www.w3.org/2001/XMLSchema-instance" xmlns:ali="http://www.niso.org/schemas/ali/1.0/" article-type="research-article" dtd-version="1.2" xml:lang="en"><front><journal-meta><journal-id journal-id-type="publisher-id">Lesnoy Vestnik / Forestry Bulletin</journal-id><journal-title-group><journal-title xml:lang="en">Lesnoy Vestnik / Forestry Bulletin</journal-title><trans-title-group xml:lang="ru"><trans-title>Лесной вестник / Forestry Bulletin</trans-title></trans-title-group></journal-title-group><issn publication-format="print">2542-1468</issn><publisher><publisher-name xml:lang="en">Eco-Vector</publisher-name></publisher></journal-meta><article-meta><article-id pub-id-type="publisher-id">706770</article-id><article-id pub-id-type="doi">10.18698/2542-1468-2024-5-153-165</article-id><article-categories><subj-group subj-group-type="toc-heading" xml:lang="en"><subject>Forest biotechnology</subject></subj-group><subj-group subj-group-type="toc-heading" xml:lang="ru"><subject>Лесная биотехнология</subject></subj-group><subj-group subj-group-type="article-type"><subject>Research Article</subject></subj-group></article-categories><title-group><article-title xml:lang="en">Kraft pulp structural and morphological property changes produced from refined introduced Lodgepole pine wood</article-title><trans-title-group xml:lang="ru"><trans-title>Изменение структурно-морфологических свойств сульфатной целлюлозы из древесины интродуцированной сосны скрученной при размоле</trans-title></trans-title-group></title-group><contrib-group><contrib contrib-type="author"><name-alternatives><name xml:lang="en"><surname>Kazakov</surname><given-names>Yakov V.</given-names></name><name xml:lang="ru"><surname>Казаков</surname><given-names>Яков Владимирович</given-names></name></name-alternatives><address><country country="RU">Russian Federation</country></address><bio xml:lang="en"><p>Dr. Sci. (Engineering) Professor of the Department of pulp and paper and wood chemical production, of the Higher School of Natural Sciences and Technologies</p></bio><bio xml:lang="ru"><p>д-р техн. наук, проф. кафедры целлюлозно-бумажных и лесохимических производств Высшей школы естественных наук и технологий</p></bio><email>j.kazakov@narfu.ru</email><xref ref-type="aff" rid="aff1"/></contrib><contrib contrib-type="author"><name-alternatives><name xml:lang="en"><surname>Babich</surname><given-names>Nikolay A.</given-names></name><name xml:lang="ru"><surname>Бабич</surname><given-names>Николай Алексеевич</given-names></name></name-alternatives><address><country country="RU">Russian Federation</country></address><bio xml:lang="en"><p>Dr. Sci. (Agriculture), Professor of the Department of Landscape Architecture and Artificial Forests of the Higher School of Natural Sciences and Technologies</p></bio><bio xml:lang="ru"><p>д-р с.-х. наук, проф. кафедры ландшафтной архитектуры и искусственных лесов Высшей школы естественных наук и технологий</p></bio><email>n.babich@narfu.ru</email><xref ref-type="aff" rid="aff1"/></contrib><contrib contrib-type="author"><name-alternatives><name xml:lang="en"><surname>Krushevskaya</surname><given-names>Natal’ya A.</given-names></name><name xml:lang="ru"><surname>Крушевская</surname><given-names>Наталья Андреевна</given-names></name></name-alternatives><address><country country="RU">Russian Federation</country></address><bio xml:lang="en"><p>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</p></bio><bio xml:lang="ru"><p>магистрант кафедры целлюлозно-бумажных и лесохимических производств Высшей школы естественных наук и технологий</p></bio><email>n.krushevskaya@narfu.ru</email><xref ref-type="aff" rid="aff1"/></contrib></contrib-group><aff-alternatives id="aff1"><aff><institution xml:lang="en">Northern (Arctic) Federal University named after M.V. Lomonosov</institution></aff><aff><institution xml:lang="ru">ФГАОУ ВО «Северный (Арктический) федеральный университет имени М.В. Ломоносова» (САФУ)</institution></aff></aff-alternatives><pub-date date-type="pub" iso-8601-date="2024-10-26" publication-format="electronic"><day>26</day><month>10</month><year>2024</year></pub-date><volume>28</volume><issue>5</issue><issue-title xml:lang="en"/><issue-title xml:lang="ru"/><fpage>153</fpage><lpage>165</lpage><history><date date-type="received" iso-8601-date="2026-04-25"><day>25</day><month>04</month><year>2026</year></date></history><permissions><copyright-statement xml:lang="en">Copyright ©; 2024, Kazakov Y.V., Babich N.A., Krushevskaya N.A.</copyright-statement><copyright-statement xml:lang="ru">Copyright ©; 2024, Казаков Я.В., Бабич Н.А., Крушевская Н.А.</copyright-statement><copyright-year>2024</copyright-year><copyright-holder xml:lang="en">Kazakov Y.V., Babich N.A., Krushevskaya N.A.</copyright-holder><copyright-holder xml:lang="ru">Казаков Я.В., Бабич Н.А., Крушевская Н.А.</copyright-holder><ali:free_to_read xmlns:ali="http://www.niso.org/schemas/ali/1.0/"/><license><ali:license_ref xmlns:ali="http://www.niso.org/schemas/ali/1.0/">https://creativecommons.org/licenses/by/4.0</ali:license_ref></license></permissions><self-uri xlink:href="https://journals.eco-vector.com/2542-1468/article/view/706770">https://journals.eco-vector.com/2542-1468/article/view/706770</self-uri><abstract xml:lang="en"><p>Modification features in the structural and dimensional properties of kraft unbleached pulp obtained from Lodgepole pine (<italic>Pinus contorta var. latifolia Engelm</italic>) 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&amp;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&amp;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.</p></abstract><trans-abstract xml:lang="ru"><p>Выявлены и проанализированы особенности изменения структурно-размерных свойств сульфатной небеленой целлюлозы из сосны скрученной (<italic>Pinus</italic><italic> contorta</italic><italic> var</italic><italic>. latifolia</italic><italic> Engelm</italic>) в условиях лабораторного стандартизированного размола до 60 °ШР на мельнице Йокро. Охарактеризованы различия в свойствах волокон, измеренных на автоматическом анализаторе волокна L&amp;W Fiber Tester, в образцах целлюлозы с высоким (число Каппа 56 ед.) и низким (число Каппа 25 ед.) содержанием лигнина. Показано, что при уменьшении содержания лигнина в целлюлозе, снижаются средняя длина волокна с 2,1 до 1,9 мм, средняя ширина с 31,4 до 30,1 мкм, фактор формы 89,2 до 82,1 %, повышается число изломов на 1 мм с 0,28 до 0,81. Выявлено, что характер изменения фракционного состава по длине, ширине и фактору формы волокна, а также структурно-размерных свойств целлюлозы из сосны скрученной при размоле зависит коренным образом от содержания лигнина. Установлено, что волокна с низким содержанием лигнина легче разрушаются при размоле по местам дефектов, а оставшиеся фрагменты обладают повышенной прямизной. Показано изменение эффекта размола от преимущественной фибрилляции и незначительного увеличения мелочи для волокон целлюлозы с высоким содержанием лигнина, к преимущественной рубке волокон с низким содержанием лигнина. При уменьшении содержания лигнина увеличивается скорость снижения длины волокна при размоле, и меняется направление изменения структурно-размерных свойств.</p></trans-abstract><kwd-group xml:lang="en"><kwd>Lodgepole pine</kwd><kwd>introduction</kwd><kwd>fibers</kwd><kwd>kraft pulp</kwd><kwd>structural and morphological properties</kwd><kwd>fractional comp bosition</kwd></kwd-group><kwd-group xml:lang="ru"><kwd>сосна скрученная</kwd><kwd>интродукция</kwd><kwd>волокно</kwd><kwd>сульфатная целлюлоза</kwd><kwd>структурно-морфологические свойства</kwd><kwd>фракционный состав</kwd></kwd-group><funding-group/></article-meta></front><body></body><back><ref-list><ref id="B1"><label>1.</label><citation-alternatives><mixed-citation xml:lang="en">Melekhov I.S. Introduktsiya khvoynykh v lesnom khozyaystve [Introduction of conifers in forestry]. Russian J. of Forest Science [Lesovedenie], 1984, no. 6, pp. 72–78.</mixed-citation><mixed-citation xml:lang="ru">Мелехов И.С. 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