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- Title
Variação anual da umidade de equilíbrio e da cor de madeiras amazônicas submetidas a ensaios de campo.
- Authors
Pacheco de Souza, Adilson; Lima Mota, Luan; Henrique Casavecchia, Bruno; Martins Stangerlin, Diego; Rodolfo de Melo, Rafael
- Abstract
The equilibrium moisture content (EMC) and the wood color of ten species of the Amazon region was submitted to fiel trials (open sky), in the Mid-North of Mato Grosso State, Brazil, during one year (dry season from May to September; rainy season from October to April). The samples with dimensions of 2 x 2 x 10 cm (thickness, width and length) were placed on a metal platform, inclined to 12° to face the North. Monthly, samples were collected for evaluation of EMC (based on the relationships between wet weight and dry weight), while for color characterization, The CIELa*b* system was used to define the parameters L* (brightness), a* (green-red coordinate), b* (yellow-blue coordinate), C* (chromaticity), h (ink angle) and • E (total color change). The EMC monthly averages showed no differences between species, however, were significant when grouped in classes of basic density. The lower levels of EMC were observed on the dry season, independent of the species, due to the reduction of the relative humidity of the air. Reductions of L*, C*, a* and b* were observed after the period of exposure to the environment. The woods of amescla and cedro had the highest and lowest value of • E, due to the low basic density and the low values of the initial colorimetric parameters (before exposure), respectively.
- Publication
Brazilian Journal of Wood Science / Revista Ciência da Madeira, 2019, Vol 10, Issue 3, p223
- ISSN
2177-6830
- Publication type
Article
- DOI
10.12953/2177-6830/rcm.v10n3p223-235