Color Characteristics of Red False Heartwood and Mature Wood of Beech (Fagus sylvatica L.) Determining by Different Chromacity Coordinates

Klement, Ivan; Vilkovská, Tatiana

doi:10.3390/su11030690

Cited by 10 publications

(7 citation statements)

References 12 publications

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“…The present observations [8,9] showed that temperature had a much more remarkable impact on color changes than the duration of drying. These results agree with the work of [9][10][11], where a more remarkable effect of temperature than the time of drying on wood color change was confirmed.…”

Section: Resultssupporting

confidence: 92%

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The Influence of Drying Temperature on Color Change of Hornbeam and Maple Wood Used as Surface and Inner Layers of Wood Composites

et al. 2021

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The thermal treatment of wood changes its structure due to the degradation of wood polymers (cellulose, hemicellulose and lignin), so the physical properties of wood are either improved or degraded. Color changes apply not only to natural wood, but also to such wood composites for which some amount of glue is used in their construction (e.g., plywood, blockboard or laminboard). This article is focused on the analysis of hornbeam and field maple wood color changes influenced by drying temperature. Two types of drying modes were used: hot-air mode where the temperature of the drying environment was 60 °C, and high-temperature mode with a drying temperature of 120 °C. The drying mode was divided into two phases depending on the moisture content of the wood. The compared woods had similar values of color coordinates at the beginning of drying. During hot-air drying, the largest changes in color coordinates occurred during the first 24 h. The total color difference between the color at the end and the beginning of drying was 7.3 for hornbeam and 11.1 for maple. The overall color difference between the compared woods was minimal. During high-temperature drying (120 °C), the color changes of the dried woods were more pronounced. In the case of maple wood, there was a very significant change in color and the value of ΔE* was twice as high as for hornbeam. The total color difference between the color at the end and at the beginning of drying was 8.7 for hornbeam and 18.9 for maple.

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Section: Resultssupporting

confidence: 92%

“…Similarly, the work in [10] was focused on the analysis of beech wood with red false heart wood (FHW) and mature wood (MW) color changes by different methods. Research showed using high-temperature drying caused changes in the coordinates of the color space (L*, a*, b*).…”

Section: Introductionmentioning

confidence: 99%

The Influence of Drying Temperature on Color Change of Hornbeam and Maple Wood Used as Surface and Inner Layers of Wood Composites

et al. 2021

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“…European beech (Fagus sylvatica L.) is one of the most popular commercial broad leaved tree species in Central Europe [1,2]. Beech wood is preferred due to its properties; especially because it is easily workable and impregnable.…”

Section: Introductionmentioning

confidence: 99%

The Impact of Paraffin-Thermal Modification of Beech Wood on Its Biological, Physical and Mechanical Properties

Reinprecht¹,

Repák²

2019

Forests

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The European beech (Fagus sylvatica L.) wood was thermally modified in the presence of paraffin at the temperatures of 190 or 210 °C for 1, 2, 3 or 4 h. A significant increase in its resistance to the brown-rot fungus Poria placenta (by 71.4%–98.4%) and the white-rot fungus Trametes versicolor (by 50.1%–99.5%) was observed as a result of all modification modes. However, an increase in the resistance of beech wood surfaces to the mold Aspergillus niger was achieved only under more severe modification regimes taking 4 h at 190 or 210 °C. Water resistance of paraffin-thermally modified beech wood improved—soaking reduced by 30.2%–35.8% and volume swelling by 26.8%–62.9% after 336 h of exposure in water. On the contrary, its mechanical properties worsened—impact bending strength decreased by 17.8%–48.3% and Brinell hardness by 2.4%–63.9%.

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“…The GL par and GL per values of heattreated wood were more concentrated than those of the control, indicating that the gloss uniformity of wood was enhanced by HT. Note: Criteria-1 was proposed by Cui [37,38], and Criteria-2 was proposed by Cividini [39].…”

Section: Gloss Distribution Change Of Wood Due To Heat Treatmentmentioning

confidence: 99%

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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Color Characteristics of Red False Heartwood and Mature Wood of Beech (Fagus sylvatica L.) Determining by Different Chromacity Coordinates

Cited by 10 publications

References 12 publications

The Influence of Drying Temperature on Color Change of Hornbeam and Maple Wood Used as Surface and Inner Layers of Wood Composites

The Influence of Drying Temperature on Color Change of Hornbeam and Maple Wood Used as Surface and Inner Layers of Wood Composites

The Impact of Paraffin-Thermal Modification of Beech Wood on Its Biological, Physical and Mechanical Properties

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

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