Utilize este identificador para referenciar este registo: http://hdl.handle.net/10400.5/6003
Título: The influence of heartwood on the pulping properties of Acacia melanoxylon wood
Autor: Lourenço, Ana
Baptista, Isabel
Gominho, Jorge
Pereira, Helena
Palavras-chave: Acacia melanoxylon
heartwood
sapwood
extractives
pulp yield
Data: 2008
Editora: The Japan Wood Research Society
Citação: "Journal of Wood Science". ISSN 1435-0211. 54 (2008) 464-469
Resumo: The pulping wood quality of Acacia melanoxylon was evaluated in relation to the presence of heartwood. The sapwood and heartwood from 20 trees from four sites in Portugal were evaluated separately at 5% stem height level in terms of chemical composition and kraft pulping aptitude. Heartwood had more extractives than sapwood ranging from 7.4% to 9.5% and from 4.0% to 4.2%, respectively, and with a heartwood-to-sapwood ratio for extractives ranging from 1.9 to 2.3. The major component of heartwood extractives was made up of ethanol-soluble compounds (70% of total extractives). Lignin content was similar in sapwood and heartwood (21.5% and 20.7%, respectively) as well as the sugar composition. Site did not infl uence the chemical composition. Pulping heartwood differed from sapwood in chemical and optical terms: lower values of pulp yield (53% vs 56% respectively), higher kappa number (11 vs. 7), and lower brightness (28% vs 49%). Acacia melanoxylon wood showed an overall good pulping aptitude, but the presence of heartwood should be taken into account because it decreases the raw-material quality for pulping. Heartwood content should therefore be considered as a quality variable when using A. melanoxylon wood in pulp industries
Peer review: yes
URI: http://hdl.handle.net/10400.5/6003
ISSN: 1435-0211
Aparece nas colecções:CEF - Artigos de Revistas

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