Qualidade de painéis aglomerados homogêneos produzidos com a madeira de clones de Eucalyptus urophylla

Mendes, Rafael Farinassi; Mendes, Lourival Marin; Mendonça, Lilian Lima; Júnior, José Benedito Guimarães; Mori, Fábio Akira

doi:10.1590/01047760.201420021273

Cited by 18 publications

(19 citation statements)

References 6 publications

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“…Sin embargo, las densidades reales o aparentes de los tableros se situaron por debajo de la densidad nominal estipulada de 750 kg/ m 3 y 850 kg/m 3 . Esto puede ser justificado debido a la pérdida de partículas durante la formación del colchón, así como también puede estar relacionado con el retorno en espesor de los tableros al retirarlo de la prensa y colocarlos en acondicionamiento, con un consecuente aumento del volumen y reducción de la densidad nominal inicial del tablero (Mendes et al 2014). Cabral et al (2007) fabricaron tableros aglomerados de partículas con tres especies Eucalyptus grandis, Eucalyptus urophylla e Eucalyptus cloeziana, y obtuvieron una media en densidad de 700 kg/m 3 , valores que son similares a los obtenidos en la presente investigación para los tableros de densidad real 731 kg/m 3 .Sin embargo, aun cuando en la conformación del producto participe una sola especie, la variabilidad de la densidad dentro y entre tableros es posible, situación que mencionan en su investigación Moreno et al (2005) con tableros de partículas de ramas de Fraxinus americana y Zambrano et al (2013) con residuos industriales de la madera de Pino patula.…”

Section: Condiciónunclassified

“…En general, el MOR en flexión obtenido en este estudio con los tableros de ambas densidades (Figura 5), son mayores a los valores de tableros aglomerados de partículas encontrados de varias investigaciones, las cuales fueron realizadas en árboles y clones de la madera de E. urophylla, obteniendo tableros con densidades en el rango de 650 kg/m 3 a 800 kg/m 3 (Del Menezii et al 1996, Mendonca 2008, Nauman 2008, Mendes 2009, Mendes 2014, De Almeida et al 2015 y superando en un 55% a los referidos por Iwari et al 2000y Bianche et al 2012.…”

Section: Flexión Estática (Mor)unclassified

“…Mendes et al (2014) indican que las perspectivas son bastantes positivas para el crecimiento a nivel mundial del sector de tableros de madera de forma general, siendo los tableros de partículas el de mayor consumo (57 %) del total, con un crecimiento continuo entre un 2 % a 5 % anualmente (Ashoria y Nourbakhsh 2008, Kord et al 2016).…”

Section: Introductionunclassified

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Propiedades de tableros aglomerados de partículas fabricados con madera de Eucalyptus urophylla

Rangel¹,

Moreno

Trejo

et al. 2017

Maderas, Cienc. tecnol.

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RESUMENEste es un estudio exploratorio para dar uso a la madera de Eucalyptus urophylla en la elaboración de tableros aglomerados de partículas. Por lo tanto, los objetivos fueron determinar sus propiedades físico-mecánicas y evaluar los resultados bajo norma Alemana Instituto Alemán de Normalización (DIN) y Venezolana Comisión Venezolana de Normas Industriales (CONEVIN). Para los tableros de densidad real de 731 kg/m 3 , la absorción de agua promedio a 2 y 24 horas no cumple de acuerdo a las normas, para el caso de los tableros de densidad real 831 kg/m 3 cumple con la norma. La variación del espesor (hinchamiento) promedio por inmersión en agua a 2 horas para los tableros con densidad de 731 kg/m 3 no cumple con lo exigido en ambas normas, pero si cumple con los requerimientos para 24 horas. Para el caso de los tableros con densidad de 838 kg/m 3 la variación de espesor a 2 y 24 horas cumplió con las normas. Respecto de las propiedades mecánicas, tanto el módulo de ruptura en flexión estática como la tensión perpendicular (adhesión interna) para ambos niveles de densidad superaron el valor mínimo aceptado en las normas, demostrando que las partículas de madera de Eucalyptus urophylla presentan características tecnológicas adecuadas para la fabricación de tableros de partículas de densidad media.Palabras clave: Adhesión interna, densidad, flexión estática, tensión perpendicular, urea formaldehído. ABSTRACTThis is an exploratory study on the feasibility of using Eucalyptus urophylla wood for the production of particleboards. Therefore, the aims were to determine their physical and mechanical properties and to evaluate the results with German Standards Institute (DIN) and Industrial Standards Commission Venezuelan (COVENIN). For boards with a real density of 731 kg/m 3 , the average water absorption at 2 and 24 hours does not meet the standards, in the case of real density boards 831 kg/m 3 that fulfilled with both standards. The average water absorption at 2 and 24 hours of boards for the actual density of 731 kg /m 3 did not comply with the requirements for both standards, unlike the particleboards with density equal 831 kg/m 3 that fulfilled with them. The average thickness variation (swelling) by immersion in water for 2 hours for boards with a density of 731 kg/m 3 did not meet the requirements of both 373 -386, 2017 standards, but meet the requirements for 24 hours. In the case of boards with a density of 838 kg /m 3 , thickness variation at 2 and 24 hours meet with the standards. Regarding mechanical properties both, the modulus of rupture in static bending and perpendicular tension (internal bond) for both real density levels exceed the minimum accepted by standards, demonstrating that E. urophylla wood exhibit suitable technological characteristics for particleboards medium density manufacture.Keywords: Density, internal bond, perpendicular tension, static bending, urea formaldehyde. INTRODUCCIÓNEn Venezuela, la industria de contrachapado y aglomerado se inicia en el año 1957, con la puesta en marcha...

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Section: Condiciónunclassified

Section: Flexión Estática (Mor)unclassified

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Propiedades de tableros aglomerados de partículas fabricados con madera de Eucalyptus urophylla

Rangel¹,

Moreno

Trejo

et al. 2017

Maderas, Cienc. tecnol.

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“…In addition, numerous studies performed such as Iwakiri et al (2004), Iwakiri et al (2008), Mendes et al (2014), Cunha et al (2014) and Gorski et al (2015), prove that particleboards and OSB produced with Eucalyptus wood present, generally speaking, better physical and mechanical properties when compared to the panels traditionally manufactured with Pinus wood. Therefore, it is possible to produce panels of superior quality to those produced nowadays, and still, with the availability of obtaining raw materials from forests with more accelerated growth and cutting when compared to the Pinus forests.…”

Section: Introductionmentioning

confidence: 95%

USE OF FIVE Eucalyptus species FOR PARTICLEBOARDS MANUFACTURE1

et al. 2017

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-The objective of this study was to evaluate the technical feasibility of the use of five Eucalyptus species, originating from plantations with short rotation cycle, for particleboards manufacture. The following species have been studied: Eucalyptus benthamii, Eucalyptus dunni, Eucalyptus grandis, Eucalyptus saligna, Eucalyptus urograndis, their mixture and Pinus taeda as a control. 21 wood particleboard have been produced, with nominal density of 0.65 g/cm³, totaling 7 treatments. For the bonding, urea-formaldehyde resin was used, in the proportion of 8% of solids dry weight base of the particles, 2% of catalyst ammonium sulphate on weight of resin and 1% of paraffin. The Eucalyptus particleboards showed lower values of WA2h and WA24h than the particleboards produced with Pinus taeda. The particleboards composed Mix of species exhibited high dimensional stability similar to those produced with the pure Eucalyptus species. E. grandis showed values statistically higher of mechanical resistance (MOR and MOE) to those obtained by the other species studied, as well as, the Eucalyptus species were higher than the control species. In internal bond the particleboards produced with E. grandis was among the highest results of internal bond, being statistically similar to E. saligna. The species Mix particleboards exhibited proprieties in general similar to those produced with the pure Eucalyptus species. All species as well as the mix among them showed technical feasibility for particleboard manufacture.Keywords: Short rotation; Fast growing species; Agglomerated particles panels. UTILIZAÇÃO DE CINCO ESPÉCIES DE EUCALYPTUS PARA A PRODUÇÃO DE PAINÉIS AGLOMERADOSRESUMO -O objetivo deste estudo foi avaliar a viabilidade técnica da utilização de cinco espécies de Eucalyptus, provenientes de plantios com ciclo de curta rotação, para produção painéis aglomerados. Foram estudadas as espécies: Eucalyptus benthamii, Eucalyptus dunni, Eucalyptus grandis, Eucalyptus saligna, Eucalyptus urograndis, a mistura entre elas e o Pinus taeda como testemunha. Foram produzidos 21 painéis aglomerados, com massa específica nominal de 0,65 g/cm³, totalizando em 7 tratamentos. Para a colagem utilizou-se a resina ureia-formaldeído, na proporção de 8% de sólidos base peso seco das partículas, 2% de catalisador sulfato de amônio sobre peso da resina e 1% de parafina. Os painéis de Eucalyptus apresentaram menores valores de AA2h e AA24h do que os painéis produzidos com Pinus taeda. Os painéis compostos pelo Mix de espécies apresentaram estabilidade dimensional semelhante aos produzidos com as espécies de Eucalyptus puras. O E. grandis apresentou valores estatisticamente superiores de resistência mecânica (MOR e MOE) aos obtidos pelas demais espécies estudadas, assim como, as espécies de Eucalyptus foram superiores à espécie testemunha. Na tração perpendicular os painéis produzidos com E. grandis apresentou entre os maiores resultados de tração perpendicular, sendo estatisticamente semelhante ao E. saligna. Os painéis do Mix de espécies apre...

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“…Eucalyptus urophylla is used for the production of plywood (Almeida et al, 2004;Guimarães JR et al, 2012), agglomerates (Mendes et al, 2014), cement-wood panels , LVL (Guimarães JR et al, 2015), OSB (Mendes et al, 2009), floors (Padilha et al, 2006), lumber (Scanavaca Jr & Garcia, 2003b;Gonçalves et al, 2009), furniture (Plaster et al, 2012), cellulose pulp and kraft paper (Lorenzi et al, 2003;Queiroz et al, 2004;Santos & Sansígolo, 2007;Liu & Zhou, 2011), charcoal and biomass (Santiago & Andrade, 2005;Rezende et al, 2010;Assis et al, 2012;Reis et al, 2012;Gadelha et al, 2015;Wiersema & León, 2016), among others.…”

Section: Introductionmentioning

confidence: 99%

PHYSICAL-MECHANICAL CHARACTERIZATION OF Eucalyptus urophylla WOOD

et al. 2017

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ABSTRACT:Eucalyptus urophylla consists in a wood-producing species, which offers a natural multiple raw material of good quality for applications in rural and civil constructions. However, Eucalyptus urophylla still has a small utilization as building parts and elements, resulting from the possible ignorance and low diffusion of its structural possibilities. Thereby, the present research aims to measure the main thirteen mechanical properties of Eucalyptus urophylla wood for two different moisture contents, 12% and 30% (green wood). Furthermore, in these two conditions of moisture content evaluation, volumetric mass densities were also evaluated. At the end of this evaluation, which included 2688 determinations, all the obtained results were statistically treated with t-test at a 5% of significance level in order to evaluate the influence of moisture content in the evaluated properties. Twelve mechanical properties were significantly affected by moisture content, and the behavior pattern consisted in increasing the values of the properties with the reduction of the moisture content.

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Qualidade de painéis aglomerados homogêneos produzidos com a madeira de clones de Eucalyptus urophylla

Cited by 18 publications

References 6 publications

Propiedades de tableros aglomerados de partículas fabricados con madera de Eucalyptus urophylla

Propiedades de tableros aglomerados de partículas fabricados con madera de Eucalyptus urophylla

USE OF FIVE Eucalyptus species FOR PARTICLEBOARDS MANUFACTURE1

PHYSICAL-MECHANICAL CHARACTERIZATION OF Eucalyptus urophylla WOOD

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