Reduction of the surface colour variability of thermally modified Eucalyptus globulus wood by colour pre-grading and homogeneity thermal treatment

Griebeler, Carolina Gomes de Oliveira; Tondi, Gianluca; Schnabel, Thomas; Iglesias, Carmen Tarradas; Ruiz, Sergio

doi:10.1007/s00107-018-1310-3

Cited by 6 publications

(10 citation statements)

References 11 publications

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“…The colorimetric properties of tropical timber are desired for furniture manufacturing (ZANUNCIO et al, 2014) and studies have reported the relationship of color variations with the physical and mechanical properties of wood, especially density BERROCAL, 2009;GARCIA et al, 2014;SILVA et al 2017;GRIEBELER et al, 2018). The relationship between wood density and chromatic variables enables a fast and reliable classification, fostering a correct industrialization and environmentally appropriate use of tropical timber (ALMEIDA et al, 2017).…”

Section: Introductionmentioning

confidence: 99%

Wood Colorimetry for the Characterization of Amazonian Tree Species: A Subsidy for a More Efficient Classification

Sousa

Barbosa

Soares

et al. 2019

CERNE

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Wood colorimetry for the characterization of amazonian tree species: a subsidy for a more efficient classification. CERNE, v. 25, n. 4, p.451-462, 2019. HIGHLIGHTS The colorimetry can be used as a tool in the quality control of wood. The darker woods with lower luminosity have bigger density. The color coordinate a* presented the best correlations with the basic density. The sawing direction can affect wood color.

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Section: Introductionmentioning

confidence: 99%

Wood Colorimetry for the Characterization of Amazonian Tree Species: A Subsidy for a More Efficient Classification

Sousa

Barbosa

Soares

et al. 2019

CERNE

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“…This result was consistent with the findings of previous studies that wood density was negatively correlated with L * and b * . 13,34 For blue gum wood, L * and b * in the pinkish group were both lower than those in the yellowish group with generally higher density. 13 The significant difference in density was about 19% between the two groups.…”

Section: Influence Of Density On Colour Variability Of Heat-treated Woodmentioning

confidence: 92%

“…[10][11][12] HT can substantially change the wood quality from an aesthetic point of view. 13 Thus, HT induced change of aesthetic qualities of wood is an important subject.…”

Section: Introductionmentioning

confidence: 99%

“…The wood surface colour is useful for pre-grading to reduce the surface colour variability of heat-treated Eucalyptus globulus wood, and the wood samples are divided into two groups that present different densities. 13 If density grading is performed before HT, it may lead to a more consistent sorting of products for the market, and also facilitate the use and maintenance of the wood products with the support of a more uniform delivery of woods.…”

Section: Introductionmentioning

confidence: 99%

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Effects of density on colour and gloss variability changes of wood induced by heat treatment

Zhou

et al. 2021

Color Research & Application

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The influence of heat treatment severity (resulting from temperature) on the colour and gloss distribution changes of mahogany wood, and the effects of wood density on the responses to heat treatment were evaluated. The wood timbers with different densities were treated at 150 C to 200 C with an interval of 10 C and duration of 4 hours for heat treatment schedules. The colour parameters (lightness L * , red-green axis value a * , yellow-blue axis value b * ) and gloss (parallel and perpendicular to the grain) values of heat-treated wood were determined. The distributions of colour and gloss were analyzed using a frequency counts method. Results show that heat treatment resulted in the distinct decrease in L * and b * , while almost no change in a * for mahogany wood.The lower gloss values were obtained in the wood after heat treatment. The colour and gloss uniform on the exposed surface of the wood was improved due to heat treatment. Heat-treatment induced colour and gloss changes were more effective in the samples with lower density. The effects of density on the colour and gloss variability in the original wood were reduced by heat treatment, and this reduction was more distinct at high heat treatment temperature. The total gloss change was found to be highly correlated with the total colour change of heat-treated wood.

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“…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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Reduction of the surface colour variability of thermally modified Eucalyptus globulus wood by colour pre-grading and homogeneity thermal treatment

Cited by 6 publications

References 11 publications

Wood Colorimetry for the Characterization of Amazonian Tree Species: A Subsidy for a More Efficient Classification

Wood Colorimetry for the Characterization of Amazonian Tree Species: A Subsidy for a More Efficient Classification

Effects of density on colour and gloss variability changes of wood induced by heat treatment

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

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