Wood basic density effect of Eucalyptus grandis in the paper making
| Autor: | Ricardo Jorge Klitzke, Alan Sulato de Andrade, Umberto Klock, Eliane Lopes da Silva, Victor Gonçalves Cremonez, Eraldo Antonio Bonfatti Júnior |
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| Rok vydání: | 2019 |
| Předmět: |
0106 biological sciences
Materials science genetic structures General Physics and Astronomy Elemental chlorine free engineering.material complex mixtures 01 natural sciences paper properties stomatognathic system 010608 biotechnology General Materials Science Statistical analysis Pulp (paper) technology industry and agriculture Paper production General Chemistry Pulp and paper industry Eucalyptus Kraft pulping stomatognathic diseases pulp bleaching Kraft process engineering Basic density Pulp bleaching |
| Zdroj: | Matéria (Rio de Janeiro) v.24 n.3 2019 Matéria (Rio de Janeiro. Online) instacron:RLAM Matéria (Rio de Janeiro), Volume: 24, Issue: 3, Article number: e12420, Published: 16 SEP 2019 |
| ISSN: | 1517-7076 |
| DOI: | 10.1590/s1517-707620190003.0735 |
| Popis: | The basic density is the main technical property of the wood due to the fact of the easy determination and correlation with the others wood properties. In this article, it was evaluated wood chips from a five-years-old Eucalyptus grandis in three different silvicultural treatments for pulp and paper production. First, a conventional kraft pulping was executed in the same conditions and then submitted to some elemental chlorine free (ECF) bleaching process to achieve the target brightness of 88 ± 1% ISO. The bleached pulps were refined in a Jokro Mill at 0, 2250, 4500 and 6750 revolutions and their physical, mechanical and optical properties were analyzed. The statistical analysis indicated a difference in the wood basic density from the different silvicultural treatments. The yield of the pulping process was not affected by the variation of the wood basic density. The denser wood had the advantage of a lower specific wood consumption while the disadvantage was a greater difficulty in the delignification and a decrease in the selectivity of the pulping process. The denser wood was the one with the best bleachability and the one that most consumed chlorine in the bleaching process. The increase of the wood density caused gains in the fisical and optical properties of the bleached pulp and losses in the mechanical properties.The optical properties of the pulps from denser woods are more resistant than the negative effects of mechanical properties. Keywords: Kraft pulping; pulp bleaching; paper properties. |
| Databáze: | OpenAIRE |
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