Eucalyptus globulus Stumpwood as a Raw Material for Pulping
In this study, Eucalyptus globulus stumpwood samples collected from six different sites in Portugal were evaluated for their ease of pulping, using two delignification processes (kraft and alkaline sulfite-anthraquinone-methanol (ASAM)). Morphologically, the stumpwood included fibers with a mean len...
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North Carolina State University
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doaj-06cb7d2601274189b88bdea79e95cf842020-11-25T00:26:15ZengNorth Carolina State UniversityBioResources1930-21261930-21262014-05-01934038404910.15376/biores.9.3.4038-4049Eucalyptus globulus Stumpwood as a Raw Material for PulpingJorge Gominho0Cátia Lopes1Ana Lourenço2Rogério Simões3Helena Pereira4Centro de Estudos Florestais, Instituto Superior de Agronomia, Universidade de Lisboa, Tapada da Ajuda 1349-017 Lisboa, PortugalCentro de Estudos Florestais, Instituto Superior de Agronomia, Universidade de Lisboa, Tapada da Ajuda 1349-017 Lisboa, PortugalCentro de Estudos Florestais, Instituto Superior de Agronomia, Universidade de Lisboa, Tapada da Ajuda 1349-017 Lisboa, PortugalResearch Unit of Textile and Paper Materials, University of Beira Interior, 6201-001 Covilhã, PortugalCentro de Estudos Florestais, Instituto Superior de Agronomia, Universidade de Lisboa, Tapada da Ajuda 1349-017 Lisboa, PortugalIn this study, Eucalyptus globulus stumpwood samples collected from six different sites in Portugal were evaluated for their ease of pulping, using two delignification processes (kraft and alkaline sulfite-anthraquinone-methanol (ASAM)). Morphologically, the stumpwood included fibers with a mean length of 0.930 mm, diameter of 21.4 µm, lumen width of 9.1 µm, and cell-wall thickness of 6.1 µm. The Runkel ratio varied between 1.0 and 1.9, and the slenderness ratio ranged between 50.6 and 35.1. ASAM pulps presented higher yields and kappa numbers (49.3% and 36, respectively) when compared to kraft pulps (42.7% and 14, respectively). Extractive-free material increased pulp yield (51.7% and 47.5% for ASAM and kraft, respectively) and decreased kappa number (18 and 11). The kraft pulps showed a coarseness of 0.096 mg/m, curl of 5.2%, and 16.7% kinked fibers, while for the ASAM pulps, these values were 0.105 mg/m, 5.2%, and 16.3%, respectively.http://ojs.cnr.ncsu.edu/index.php/BioRes/article/view/BioRes_09_3_4038_Gominho_Eucalyptus_globulus_StumpwoodEucalyptus globulusStumpwoodFiber chemistry and morphologyPulpingKraftASAM |
collection |
DOAJ |
language |
English |
format |
Article |
sources |
DOAJ |
author |
Jorge Gominho Cátia Lopes Ana Lourenço Rogério Simões Helena Pereira |
spellingShingle |
Jorge Gominho Cátia Lopes Ana Lourenço Rogério Simões Helena Pereira Eucalyptus globulus Stumpwood as a Raw Material for Pulping BioResources Eucalyptus globulus Stumpwood Fiber chemistry and morphology Pulping Kraft ASAM |
author_facet |
Jorge Gominho Cátia Lopes Ana Lourenço Rogério Simões Helena Pereira |
author_sort |
Jorge Gominho |
title |
Eucalyptus globulus Stumpwood as a Raw Material for Pulping |
title_short |
Eucalyptus globulus Stumpwood as a Raw Material for Pulping |
title_full |
Eucalyptus globulus Stumpwood as a Raw Material for Pulping |
title_fullStr |
Eucalyptus globulus Stumpwood as a Raw Material for Pulping |
title_full_unstemmed |
Eucalyptus globulus Stumpwood as a Raw Material for Pulping |
title_sort |
eucalyptus globulus stumpwood as a raw material for pulping |
publisher |
North Carolina State University |
series |
BioResources |
issn |
1930-2126 1930-2126 |
publishDate |
2014-05-01 |
description |
In this study, Eucalyptus globulus stumpwood samples collected from six different sites in Portugal were evaluated for their ease of pulping, using two delignification processes (kraft and alkaline sulfite-anthraquinone-methanol (ASAM)). Morphologically, the stumpwood included fibers with a mean length of 0.930 mm, diameter of 21.4 µm, lumen width of 9.1 µm, and cell-wall thickness of 6.1 µm. The Runkel ratio varied between 1.0 and 1.9, and the slenderness ratio ranged between 50.6 and 35.1. ASAM pulps presented higher yields and kappa numbers (49.3% and 36, respectively) when compared to kraft pulps (42.7% and 14, respectively). Extractive-free material increased pulp yield (51.7% and 47.5% for ASAM and kraft, respectively) and decreased kappa number (18 and 11). The kraft pulps showed a coarseness of 0.096 mg/m, curl of 5.2%, and 16.7% kinked fibers, while for the ASAM pulps, these values were 0.105 mg/m, 5.2%, and 16.3%, respectively. |
topic |
Eucalyptus globulus Stumpwood Fiber chemistry and morphology Pulping Kraft ASAM |
url |
http://ojs.cnr.ncsu.edu/index.php/BioRes/article/view/BioRes_09_3_4038_Gominho_Eucalyptus_globulus_Stumpwood |
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