Influence of steaming on selected wood properties of four hardwood species

Varga, Dénes; Zee, M.E. van der

doi:10.1007/s00107-007-0205-5

Cited by 58 publications

(33 citation statements)

References 15 publications

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“…A alteração da cor da madeira após a termorretificação pode ser explicada pela combinação de vários fatores, sendo eles: (a) a dissolvição, oxidação e decomposição dos extrativos e outros componentes químicos; (b) a formação de produtos oxidativos, tais como quinonas e produtos da degradação das hemiceluloses e lignina, os quais migram às superfícies da madeira; (c) a remoção ou migração dos extrativos e compostos nutritivos tais como açúcares de baixo peso molecular e aminoácidos em direção às superfícies da madeira; e (c) o aumento relativo no teor de lignina após o tratamento, em decorrência, principalmente da degradação das hemiceluloses (AKYILDIZ et al, 2009;BEKHTA;NIEMZ, 2003;ESTEVES et al, 2008;KAMKE, 2006;SUNDQVIST;MORÉN, 2002;THEANDER et al, 1993;TJEERDSMA et al, 1998;VARGA;VAN DER ZEE, 2008). Segundo Varga e Van der Zee (2008), as madeiras com grandes quantidades de extrativos solúveis em água apresentam alterações mais intensas de cor após o tratamento.…”

Section: Introductionunclassified

Modificação da cor original da madeira de Eucalyptus grandis através de tratamentos termorretificadores

Garcia

Lopes

Santos

2014

CERNE

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MODIFICAÇÃO DA COR ORIGINAL DA MADEIRA DE Eucalyptus grandis ATRAVÉS DE TRATAMENTOS TERMORRETIFICADORESRESUMO: Neste estudo, objetivou-se determinar a modificação da cor original da madeira de Eucalyptus grandis Hill ex. Maiden após a termorretificação. Amostras de madeira foram termorretificadas sob diferentes condições de temperatura (180, 200, 215 e 230ºC) e tempo (15 minutos, 2 e 4 horas). As análises colorimétricas foram realizadas por meio do sistema CIE L*a*b* com o auxílio do espectrofotômetro Color Eye XTH-X-Rite 200d. Todos os tratamentos termorretificadores causaram uma alteração na cor original da madeira. As madeiras termorretificadas apresentaram menores valores de L* (luminosidade), quando comparadas à madeira não tratada (controle), caracterizando o escurecimento da madeira, principalmente para as condições mais severas de temperatura e tempo. As coordenadas cromáticas a* e b* apresentaram comportamentos diferentes, dependendo da combinação temperatura-tempo. A modificação da cor original da madeira possibilitou a criação de novos padrões de cor, podendo agregar maior valor à madeira estudada. MODIFICATION OF THE ORIGINAL COLOR OF THE Eucalyptus grandis WOOD BY HEAT TREATMENTSABSTRACT: The objective of this study was to determine the modification of original color of Eucalyptus grandis Hill ex. Maiden wood after heat-treatment. Wood samples were heat-treated under different temperatures (180, 200, 215 and 230 o C) and time conditions (15 minutes, 2 and 4 hours). Color analysis were performed on the CIE L*a*b* system by using a Color Eye XTH-X-Rite 200d spectrophotometer. All heat treatments promoted an alteration of the original color of wood. Heat-treated woods presented lower L* (lightness) values than untreated wood (control), characterizing the wood darkness, mainly for more severe conditions of temperature and time. Chromatic coordinates (a* and b*) showed different behaviors depending on the temperature-time combination. The modification of the original color of the wood allowed the creation of new color patterns, which can add greater value to the studied wood.

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Section: Introductionunclassified

Modificação da cor original da madeira de Eucalyptus grandis através de tratamentos termorretificadores

Garcia

Lopes

Santos

2014

CERNE

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“…Estes resultados são similares àqueles encontrados por Gierlinger et al (2004), os quais observaram que a* e L* da madeira de Larix decidua Mill apresentaram uma correlação com o teor de extrativos. Varga & Van Der Zee (2008) avaliaram o efeito do tratamento térmico nos parâmetros colorimétricos da madeira de Robinia pseudoacacia e Intsia bijuga, e observaram que a alteração da cor é altamente dependente da espécie. Esses autores encontraram uma importante variação nas coordenadas L* e b* dessas espécies, as quais apresentaram numerosas substâncias solúveis que afetaram sua cor natural e seu comportamento durante o tratamento.…”

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Alteração da cor da madeira de teca por tratamento térmico

et al. 2014

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Color Change of Teak Wood by Heat Treatment ABSTRACTThe purpose of this study was to determine the effect of heat treatment on color change of teak wood (Tectona grandis L. f.) from plantations of different spacings. Heartwood and sapwood samples were heat treated at 180 and 200°C for 2.5 hours. Colorimetric analyses were performed using a CM 2600d spectrophotometer in the CIE L*a*b* system. After heat treatment, the wood presented loss of light, becoming darker, which was more pronounced for the treatment at 200°C. Heartwood and sapwood showed different behaviors for the a* and b* coordinates, depending on the spacing, before and after heat treatments. There was an increase on red hue and a decrease on yellow hue of heartwood and sapwood treated at 200°C.

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“…Respectively, PUR beech wood specimens of low pressure marked 20% higher strength value than the corresponding black locust value, while the only case that beech wood exhibited lower strength value than black locust was the case of PUR beech specimens of higher pressure that presented 6% lower shear strength value than the corresponding black locust specimens. Probably, the adhesion quality of black locust wood could be improved through the development and use of technologies, such as steaming, priming, surface activation or plasma treatment, prior or parallel to the adhesion process, that could diminish the influence of the extractives content on the bondability of this species and eliminate this characteristic that tends to be a drawback (Varga and Van der Zee 2008).…”

Section: Resultsmentioning

confidence: 99%

Bondability of Black locust (Robinia pseudoacacia) and Beech wood (Fagus sylvatica) with polyvinyl acetate and polyurethane adhesives

Kamperidou

Barboutis

2017

Maderas, Cienc. tecnol.

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In the previous years, black locust wood (Robinia pseudoacacia) has been participating in the European subsidizing programme of tree species cultivation, aiming in the establishing of new plantations in many European countries, therefore large quantities of this species is going to be harvested in the forthcoming years and the examination of its properties would be very crucial for future utilization. In the present research, the bondability of black locust wood is examined using two different adhesives, Polyvinyl acetate and Polyurethane and two different pressure levels. Beech wood is also included in the research for comparative reasons. According to the results, the shear bond strength of black locust wood was found to be satisfying, especially in the presence of Polyvinyl acetate adhesive and the less intensive pressure used during the specimens' construction, although it was found lower compared to beech wood, referring both to Polyvinyl acetate and Polyurethane adhesive.

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Influence of steaming on selected wood properties of four hardwood species

Cited by 58 publications

References 15 publications

Modificação da cor original da madeira de Eucalyptus grandis através de tratamentos termorretificadores

Modificação da cor original da madeira de Eucalyptus grandis através de tratamentos termorretificadores

Alteração da cor da madeira de teca por tratamento térmico

Bondability of Black locust (Robinia pseudoacacia) and Beech wood (Fagus sylvatica) with polyvinyl acetate and polyurethane adhesives

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