Effect of extractives on wood color of heat treated Pinus radiata and Eucalyptus pellita
Título del documento: Effect of extractives on wood color of heat treated Pinus radiata and Eucalyptus pellita
Revista: Maderas : ciencia y tecnología
Base de datos:
Número de sistema: 000544691
ISSN: 0718-221X
Autors: 1
1
2
1
1
2
Institucions: 1Universidade Federal de Viçosa, Departamento de Engenharia Florestal, Viçosa. Brasil
2Universidade Federal de Lavras, Departamento de Ciências Florestais, Lavras. Brasil
Any:
Període: Oct
Volum: 17
Número: 4
Paginació: 857-864
País: Chile
Idioma: Inglés
Resumen en inglés Heat treatment can change wood color without any use of environmentally harmful chemicals, and the efficiency of this process depends on the raw material to be treated. The objective of this study was to evaluate the influence of extractives on the color change of Eucalyptus pellita and Pinus radiata wood during heat treatment. The extractives were extracted in cold water and in dichloromethane as well as totally removed and the wood was treated at 170°C and 200°C for three hours under atmospheric pressure and in presence of air for evaluating the lightness (L*), green-red coordinate (a*), blue-yellow coordinate (b*), color saturation (C) and tonality angle (H) values. Pinus radiata wood was more resistant to discoloration by heat treatment. The removal of total and cold water-soluble extractives before heat treatment changed the L* value of Pinus radiata, a* value of Eucalyptus pellita, and b*, C, and H values of both species. Removal of extractives soluble in dichloromethane did not affect the color of heat treated wood. Thus, understanding the influence of extractives on heat treated wood can allow adapting the raw material to the process for enhancing the applicability of heat treatment for changing wood color.
Keyword: Colorimetry,
Green-red coordinate,
Lightness,
Thermal treatment,
Wood extractives
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