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

Huichuan, Jiang; Lu, Quanguo; Li, Guanjun; Li, Jianing

doi:10.37763/wr.1336-4561/65.4.633644

Cited by 13 publications

(6 citation statements)

References 9 publications

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“…The results showed that the natural color of rubberwood (without fungal attack) was yellowish white with an average value of L = 80.11, a = 7.23, b = 20.00, and E = 82.90 (Table 4). Regarding the natural color of the rubberwood, Jiang et al (2020) reported almost the same L, a, and b values, which were 80.94, 4.37, and 21.69, respectively. Meanwhile, after being attacked by the stain fungi, the color changes, depending on the type of isolate of the stain fungi that attacks it.…”

Section: Discoloration Of the Wood Samplesmentioning

confidence: 83%

Morphological and molecular features of stain fungi infecting rubberwood (Hevea brasiliensis)

et al. 2021

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Abstract. Nandika D, Arinana, Salman ABA, Putri JY. 2021. Morphological and molecular features of stain fungi infecting rubberwood (Hevea brasiliensis). Biodiversitas 22: 5408-5416. In the southeast Asia region, particularly Indonesia, Thailand, and Malaysia, rubberwood (Hevea brasiliensis Muell. Arg.) has been widely used as a raw material in various industries particularly furniture manufacturing. However, rubberwood is highly susceptible to fungal attack due to its lack of heartwood formation. A laboratory study was conducted to investigate the morphological and molecular features of stain fungi infecting rubberwood. A total of five isolates of stain fungi belonging to three genera were identified based on internal transcribed spacer (ITS) and morphological features. All isolates belong to Order Eurotiales with each genus being Paecilomyces, Aspergillus, and Penicillium. The highest growth rate on wood samples was shown by Aspergillus chevalieri section Aspergillus and Paecilomyces maximus or P. formosus with values of 86.57% and 86.22%, respectively. All of the stain fungi genera caused varied level of discoloration on wood samples with dark grayish and very dark grayish as the more frequent color found. Quantitatively, the highest discoloration was shown by A. chevalieri section Aspergillus (?E = 27.60) and P. maximus or P. formosus (?E = 16.69). These species can be considered as newly stain fungi recorded infecting rubberwood in Indonesia. In addition, discoloration caused by these two stain fungi was the worst.

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Section: Discoloration Of the Wood Samplesmentioning

confidence: 83%

Morphological and molecular features of stain fungi infecting rubberwood (Hevea brasiliensis)

et al. 2021

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“…The change of b * was similar to that of L * that decreasing from 27.47 (control) to 20.56 (200 C) (Figure 3). Most studies have reported that the increasing HT temperature decreased the b * of rubber wood, 33 beech wood, 22 and eucalypt wood. 12 For oak wood, the b * dropped from 20.17 (control) to 18.84 (160 C) and further significantly to 3.26 (240 C) with increasing HT temperature.…”

Section: Colour Distribution Change Of Wood Due To Heat Treatmentmentioning

confidence: 99%

“…23 For plane wood, a * was affected very little by HT temperature (160 C to 200 C). 16 For the rubber wood (from 170 C to 210 C), 33 eucalypt wood (from 170 C to 200 C), 12 beech wood (from 210 C to 250 C), 22 and Cypress wood (from 160 C to 200 C), 16 the a * first F I G U R E 1 Density variation of samples F I G U R E 2 Layout of measurement points on the wood surface increased for less intensive treatments and then decreased afterwards. For pine wood, the a * presented a large variation that its tendency to increase and decrease alternated throughout the HT process.…”

Section: Colour 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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“…Through consumer preference testing, it is known that heat-treated wood with a darker color is more popular with consumers than wood without heat treatment with a lighter color. In order to achieve a deeper "teak color," Jiang et al (2020) used the CIE L*a*b* system to determine the effect of heat treatment process parameters (temperature, duration, and heating rate) on the color of rubber wood (Hevea brasiliensis) before and after heat treatment in order to obtain the best process parameters. The results showed that the temperature significantly affected the colorimetric parameters of the heat-treated rubber wood, while the duration and heating rate had no significant effect.…”

Section: Appearance (Color) Changementioning

confidence: 99%

Research progress and prospects of wood high-temperature heat treatment technology

Cao

Cheng

Cai

2022

BioRes

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High temperature heat treatment is one of the main technologies with the highest market conversion rate and broad future prospects in the functional technology of wood. Chemical reagents are not added in the production process. The treatment improves the dimensional stability, biological durability, wood color, and acoustic properties without reducing the environmental performance of the product. However, there are some problems in heat treatment, such as the reduction of mechanical properties and surface wettability of wood, high production energy consumption, and large exhaust emissions. Therefore, understanding the influence and mechanism of high temperature heat treatment technology on wood properties is of guiding significance to further improve the quality of heat-treated wood, improve production process, and develop new equipment. This article reviews the effects of heat treatment on the properties of wood and the mechanism of heat treatment. Then, some applications of heat treatment of wood are introduced. Finally, the development direction and prospect of high temperature heat treatment technology in the future are forecasted.

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

Cited by 13 publications

References 9 publications

Morphological and molecular features of stain fungi infecting rubberwood (Hevea brasiliensis)

Morphological and molecular features of stain fungi infecting rubberwood (Hevea brasiliensis)

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

Research progress and prospects of wood high-temperature heat treatment technology

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