THERMAL MODIFICATION OF Eucalyptus grandis WOOD: VARIATION OF COLORIMETRIC PARAMETERS

Pedro Henrique Gonzalez de Cademartori, Eduardo Schneid, Darci Alberto Gatto, Diego Martins Stangerlin, Rafael Beltrame

Abstract


The color modifications in Eucalyptus grandis thermally modified wood were investigated. Onehundred eighty specimens (10 x 10 x 200 mm) were prepared and thermally modified in an electrickiln for 4 and 8 h at 180-240ºC. The color parameters (L*, a*, b*, C*, h* and ΔE) were determined bythe CIE-L*a*b* method on radial and tangential sections of untreated and treated wood. The resultsindicated the darkening of specimens in the radial and tangential sections. Both sections showed variationof L* between 73 and 30, a* between 9 and 5 and b* between 20 and 8. The thermally modified woodat 180 and 200ºC showed similar patterns, equally at 220 and 240ºC. The time of exposure indicatedsignificance just in treatment at 200ºC.

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