Colour responses of Eucalyptus grandis wood to the Brazilian process of thermal modification

Griebeler, Carolina Gomes de Oliveira; Matos, Jorge Luís Monteiro de; Muñiz, Graciela Inés Bolzón de; Nisgoski, Silvana; Batista, Djeison César; Rodríguez, Carmen

doi:10.4067/s0718-221x2018005041201

Cited by 3 publications

(2 citation statements)

References 21 publications

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“…Similar changes in the color of the wood were also evident in the studies developed by Cademartori et al (2013) for Eucalyptus grandis wood heat-treated in a climate chamber at 180 ºC, 200 ºC, 220 ºC, and 240 ºC for 4 hours and 8 hours, and by Griebeler et al (2018) for the same species heat-treated in an autoclave with steam at 140 ºC, 160 ºC, and 180 ºC.…”

Section: Resultssupporting

confidence: 79%

Characterization of Acrocarpus fraxinifolius wood submitted to heat treatment

Oliveira

Aquino

et al. 2022

Maderas, Cienc. tecnol.

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Aiming to provide greater visibility for the wood species Acrocarpus fraxinifolius, the present study sought to analyze the influence of heat treatment on an industrial scale applied to wood species, also popularly known as Indian cedar. The heat treatment was carried out in an autoclave, with temperature and pressure control, and with saturated steam injection, for temperatures 155 ºC, 165 ºC, 175 ºC, and 185 ºC. Physical, chemical, and mechanical tests were carried out for the analyzed wood. The content of holocellulose and total lignin decreased, while the content of extractives showed a substantial increase. The density increased after the heat treatment, however the treated wood showed cracks, and these cracks influenced the significant loss of the values of the mechanical properties of compression, tension, and flexion. The shear showed strength gain for the temperature of 155 ºC, and the wood treated at 165 ºC was equivalent to untreated wood. The woods submitted to temperatures of 175 ºC and 185 ºC presented strength losses. The heat treatment in question contributes to increase the visibility, use and market value of wood.

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Section: Resultssupporting

confidence: 79%

Characterization of Acrocarpus fraxinifolius wood submitted to heat treatment

Oliveira

Aquino

et al. 2022

Maderas, Cienc. tecnol.

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“…Heat treatment could enhance the use of such wood species for value added products in furniture manufacturing as an alternative to expensive tropical species. Some researchers analyzed the color responses of untreated and thermally modified Eucalyptus grandis samples at three different temperatures of thermal modification by the Brazilian industrial process VAP HolzSysteme® (Griebeler et al 2018a). They also found a new method that consists of combining wood pre-grading by surface color followed by the application of homogeneity thermal treatments to reduce the surface color variability of the thermally modified blue gum wood (Griebeler et al 2018b).…”

Section: Introductionmentioning

confidence: 99%

Effect of heat treatment on the surface color of rubber wood (Hevea brasiliensis)

Huichuan¹,

Lu²,

Li³

et al. 2020

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In this study the effect heat treatment process parameters (temperature, duration and heating rate) on the surface color of rubber wood was evaluated. The color of the rubber wood was determined using CIE L*a*b* system before and after the heat treatment. The colorimetric properties, including total color difference (∆E*), lightness index (L*), red-green index (a*), and yellow-blue index (b*), were investigated at different treatment conditions. The results of analysis of variance (ANOVA) indicate that the heat treatment temperature has a significant effect on the colorimetric properties of the heat-treated rubber wood, duration and heating rate has no effect. Within the experimental range, as the heat treatment temperature and duration increasing, the color of the rubber wood gradually deepens. In order to achieve a surface color like the teak wood, the optimum process conditions are heat treatment temperature 190°C, duration 4 h, heating rate 10°C. h-1 .

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Effect of heat treatment on hardness, density and color of Populus × canadensis ‘I-214’ wood

et al. 2022

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Aim of study: To evaluate the effect of heat treatment (HT) on hardness, density and color of Populus × canadensis ´I-214´ (poplar) wood. Area of study: 15-years-old poplar wood from Pomona, Río Negro, Argentina. Material and methods: 352 samples were exposed to different HT schedules: 120ºC, 160ºC, 180ºC and 200°C for 45 min, 90 min, 135 min and 180 min. Hardness, density and color were determined before and after each HT combination. Hardness and density tests were performed following the specifications of IRAM standards and wood color was determined according to CIELab system. Main results: Hardness improved significantly at 160°C for 45 min and 90 min in comparison with control (14.34% and 9.08%, respectively) whereas this property was improved at 120°C in all cases without significant differences. The 200°C: 45 min schedule showed the worst performance with a 20.26% hardness loss. Density was lower than the control in all schedules with losses ranging from 2.50% to 10.00%. Color became darker (decrease in L value, increase in a and b values) as HT intensity increased (mainly temperature), with changes becoming evident at 180°C and 200°C. Research highlights: HT on P. × canadensis ‘I-214’ improved its hardness under two HT schedules, although was not enough to extend the feasible applications, since it still belongs to a category of “soft” wood. Hardness and density did not show a clear correlation and color of poplar wood became darker as HT intensity increased.

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Colour responses of Eucalyptus grandis wood to the Brazilian process of thermal modification

Cited by 3 publications

References 21 publications

Characterization of Acrocarpus fraxinifolius wood submitted to heat treatment

Characterization of Acrocarpus fraxinifolius wood submitted to heat treatment

Effect of heat treatment on the surface color of rubber wood (Hevea brasiliensis)

Effect of heat treatment on hardness, density and color of Populus × canadensis ‘I-214’ wood

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