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Alteração da cor da madeira de teca por tratamento térmico

Color change of teak wood by heat treatment

Resumos

O objetivo deste estudo foi determinar o efeito do tratamento térmico na alteração da cor da madeira de teca (Tectona grandis L. f.), proveniente de plantios de diferentes espaçamentos. Amostras de madeira de cerne e de alburno foram tratadas a 180 e 200ºC durante 2h30min. As análises colorimétricas foram realizadas com o auxílio do espectrofotômetro CM 2600d no sistema CIE L*a*b*. Após o tratamento, a madeira teve perda de luminosidade, tornado-se mais escura, o que se mostrou mais acentuado para o tratamento a 200ºC. As madeiras de cerne e alburno apresentaram comportamentos diferentes para as coordenadas a* e b*, dependendo do espaçamento, antes e após o tratamento. Ocorreu uma maior formação de pigmento vermelho e perda de pigmento amarelo nas madeiras de cerne e alburno tratadas a 200ºC.

colorimetria; sistema CIE L*a*b*; Tectona grandis


The 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 200ºC 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 200ºC. 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 200ºC.

colorimetry; CIE L*a*b* system; Tectona grandis


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Datas de Publicação

  • Publicação nesta coleção
    21 Out 2014
  • Data do Fascículo
    Dez 2014
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