51 documents found, page 1 of 6
Determinação da composição química e potencial de polpação da madeira Pterogyne...
Pereira,Allana Katiussya Silva; Longue Junior,Dalton; Mafra Neto,Caio da Silva; Colodette,Jorge Luiz; Gomes,Fernando José BorgesResumo A grande dependência por madeiras das espécies dos gêneros Eucalyptus e Pinus associada à busca por produtos de diferentes qualidades impulsionam estudos acerca de madeiras alternativas para fins industriais, principalmente de espécies do bioma Caatinga, pouco estudado para fins florestais. O objetivo deste estudo foi caracterizar quimicamente a madeira da espécie Pterogyne nitens assim como analisar seu...
CHEMICAL AND ENERGETIC CHARACTERIZATION OF Eucalyptus grandis × Eucalyptus urop...
Zanuncio,Antonio José Vinha; Carvalho,Amélia Guimarães; Carneiro,Angelica de Cassia Oliveira; Colodette,Jorge Luiz; Rocha,Maria Fernanda VieiraABSTRACT Wind damages are common in forest plantations and the use of this wood can minimize losses. The objective was to evaluate the chemical composition and the energetic potential of wood and charcoal from trees subject to wind damage. Eight (A to H) two-years-old Eucalyptus grandis × Eucalyptus urophylla clones were selected in a region where wind damage is frequent. The basic density, calorific value, che...
THE EFFECTS OF ALKALINE FILTRATE RECIRCULATION TOWARDS THE PROPERTIES OF LONG F...
Souza,Luciana Cerqueira; Zanuncio,Antonio Jose Vinha; Colodette,Jorge LuizABSTRACT Circuit closure can reduce water consumption, but negative effects on pulp quality and equipment wear may make it unfeasible. This study aimed to evaluate how the alkaline filtrate of the recirculation stage (EP) affects bleaching, pulp quality and characteristics of the filtrates produced. Pre-delignified cellulose pulp from a mixture of three coniferous woods was used. Bleaching followed the D(EPO)DE...
EFFECT OF RESIDUAL EFFECTIVE ALKALI ON EUCALYPTUS KRAFT PULP YIELD AND CHEMISTRY
Ribeiro,Robisnéa Adriana; Colodette,Jorge Luiz; Vaz Júnior,SílvioABSTRACT The impact of residual effective alkali (REA) and pulp delignification degree on Eucalyptus kraft pulp yield and chemistry was investigated. In this study four types of eucalypt clones were evaluated. The eucalypt woods were cooked to kappa numbers of 14±1, 18±1, 22±1 and 26±1 using two different ranges of REA, namely: low-REA (1-2 g.L-1) and high-REA (8-9 g.L-1). In general, the low-REA cooks lead to ...
ANATOMICAL, ULTRASTRUCTURAL, PHYSICAL AND MECHANICAL WOOD PROPERTIES OF TWO-YEA...
Zanuncio,Antonio José Vinha; Carvalho,Amélia Guimarães; Carneiro,Angélica de Cassia Oliveira; Tomazello Filho,Mario; Valenzuela,Paulina; Gacitúa,WilliamABSTRACT Eucalyptus wood from adult trees is used for several purposes; however, the wood of younger trees has limited use. This study aims to characterize and propose uses of two-year-old eucalyptus wood. Six two-year-old Eucalyptus grandis × Eucalyptus urophylla clones have been selected and their anatomical, ultrastructural, physical and mechanical wood characteristics evaluated. The wood of Clone A shows mo...
ANATOMICAL AND CHEMICAL PROPERTIES OF JUVENILE Schizolobium amazonicum WOOD
Vidaurre,Graziela Baptista; Vital,Benedito Rocha; Colodette,Jorge Luiz; Oliveira,Angélica de Cássia; Silva,João Gabriel Missia da; Moulin,Jordão CabralABSTRACT The objective of this study was to determine the effects of tree age and of pith-bark and base-top positions on anatomical characteristics, and the effect of age on the chemical components of Schizolobium amazonicum (Paricá wood). The material was obtained from commercial plantations in the states of Maranhão and Pará with ages of 5, 7, 9 and 11 years. The first three logs (2.7 m length each) were obta...
Cellulose pulp produced from bulrush fiber
Wille,Vania Karine Dick; Pedrazzi,Cristiane; Colodette,Jorge Luiz; Oliveira,Rubens Chaves de; Coldebella,Rodrigo; Giesbrecht,Bruna MohrABSTRACT: Brazil continues to use wood as the principal raw material source for the pulp industry; although, non-wood fibers have been revealed to be a competent substitute to produce paper with different and exceptional properties. Keeping this in focus, this study aimed to assess potential of Schoenoplectus californicus fibers (C. A. Mey.) Soják, commonly identified as bulrush or reed, in cellulosic pulp gene...
Characterization of eucalyptus clones subject to wind damage
Zanuncio,Antônio José Vinha; Carvalho,Amélia Guimarães; Carneiro,Angélica de Cassia Oliveira; Valenzuela,Paulina; Gacitúa,William; Leite,Fernando PalhaAbstract: The objective of this work was to test a new methodology to assess the resistance of trees to wind damage and determine the characteristics that increase clone resistance to winds. Tree resistance to breakage, basic density, ultrastructure, anatomy, mechanical properties, and wood growth stress have been evaluated in seven Eucalyptus grandis × Eucalyptus urophylla clones, collected from a region with ...
INFLUENCE OF CLONE HARVESTING AGE OF Eucalyptus grandis AND HYBRIDS OF Eucalypt...
Morais,Paulo Henrique Damasceno de; Longue Júnior,Dalton; Colodette,Jorge Luiz; Morais,Elisa Helena da Costa; Jardim,Carolina MarangonABSTRACT The recent efforts on the quality of the wood used in pulp and paper mills has focused in many points, among them the influence of the raw material chemical characteristics in the production process and final product quality. Considering the current demand for younger trees, the effect of the wood harvesting age in the chemical composition and in the process variables becomes a very important fact for ...
USO DA TÉCNICA DE RESISTOGRAFIA E DE VARIÁVEIS DENDROMÉTRICAS NA MODELAGEM DA D...
Dias,Donizete da Costa; Colodette,Jorge Luiz; Thiersch,Claudio Roberto; Leite,Hélio Garcia; Gomide,José LivioRESUMO A densidade básica é uma propriedade-chave de qualidade da madeira para produção de celulose, mas sua determinação demanda muito tempo e altos custos. O desenvolvimento de ferramentas de amostragem não destrutiva, eficiente e de baixo custo torna-se importante, e o Resistógrafo pode ser uma alternativa. Este estudo teve o objetivo de utilizar dados de amplitude de resistência à perfuração coletados pelo ...