THERMAL MODIFICATION OF Eucalyptus grandis WOOD: VARIATION OF COLORIMETRIC PARAMETERS

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

doi:10.4067/s0718-221x2013005000005

Cited by 24 publications

(12 citation statements)

References 10 publications

(12 reference statements)

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“…In this sense, many treatments have been proposed in order to minimize weathering effects on wood surface, with some promising results already reported. These treatments include: thermal treatments, 6,7 acetylation, 8 surface coatings, 2 manufacture of wood composites with wood flour, 9 wood fiber, 10 and in situ polymerization, 11 among other chemical modifications. 10,12,13 In comparison with other treatments, thermal treatment is an eco-friendly treatment capable of improving many wood features without using chemicals.…”

Section: Introductionmentioning

confidence: 99%

Discolouration of heat-treated fast-growing eucalyptus wood exposed to natural weathering

Delucis¹,

Beltrame²,

Gatto³

2019

Cellulose Chem. Technol.

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To heat-treat is one of the main alternatives to improve wood performance in outdoor uses. This study aimed to evaluate the discolouration of a heat-treated fast-growing eucalyptus wood exposed to natural weathering tests. Wood samples were cut from a young eucalyptus forest located in Southern Brazil. Thermal treatments were performed in an oven without forced air circulation, according to four combined settings of temperature (i.e. 180 °C and 220 °C) and time (i.e. 3 h and 6 h). The discolouration of the decayed wood was accessed according to the CIELab method. The heat-treatment improved the weathering performance of the eucalyptus wood. Compared to the natural colour of the thermally treated wood, the weathering tests caused fading and greying in its tones. Regarding the treatment parameters, the samples heat-treated during 6 h presented promising results, demonstrating that such treatment may be a useful tool for wood surface protection.

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Section: Introductionmentioning

confidence: 99%

Discolouration of heat-treated fast-growing eucalyptus wood exposed to natural weathering

Delucis¹,

Beltrame²,

Gatto³

2019

Cellulose Chem. Technol.

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“…hemicellulose) also result in coloured substances, though the impact of hemicellulose degradation on colour changes is relatively small. 23,24 NIR model development NIR spectra were collected from the cross sections of 77 wood blocks (20 mm × 20 mm × 20 mm). A total of 77 NIR spectra were combined with the colour parameters data (L*, a* and b*) measured by the NH310 colorimeter, in order to construct the regression calibration.…”

Section: Changes In Colour Parametersmentioning

confidence: 99%

Prediction of Colour Change of Thermally Modified Wood by near Infrared Spectroscopy

Zhang

2016

Journal of Near Infrared Spectroscopy

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Colour changes of untreated and thermally modified (120°C, 180°C and 220°C) southern pine wood are predicted by near infrared spectroscopy (NIR). Colour change information originating from thermal chemical decomposition was assessed by NIR spectroscopy while wood surface colour change values in the CIE1976 L*a*b* system were determined with a colour measurement instrument. Calibration models were built using partial least squares and corresponding cross-validation. A close relationship between colour change values and NIR spectra of thermally modified wood allowed for easy clustering. The proposed colour prediction model for thermally modified wood produced very high R 2 values (above 0.90) and was well suited to NIR spectra acquired from wood tangential surfaces, suggesting that the method can provide effective, online quality control.

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“…La variation de la couleur de finition observée varie selon la nature du produit de finition, de l'espèce de bois [20][21][22] et de son traitement, thermique [23][24][25][26][27] ou chimique [28].…”

Section: Introductionunclassified

Effect of artificial aging at QUV on the color of finish treated woods of Pinus sylvestris and Quercus robur

et al. 2018

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Abstract. The durability of exterior finishes on wood is not assured with the systems currently used. Thus, the objective of this study was to evaluate the color change of the finishes applied to wood, the most commercialized in Morocco, in order to find the wood-finishing couple that has the best durability in outdoor use. QUV accelerated aging tests were carried out during 2016 hours, according to the standard (NF 927-6 2006), on Scots pine (Pinus sylvestris) and Pedunculate oak (Quercus robur) coated with four finishes (two polyurethane finishes F 1 and F 2 and two acrylic finishes F 3 and F 4 ). Colorimetric measurements in color system CIELab: Gloss (L*), green-red (a*) and blue-yellow (b*) coordinates, color saturation (C*) and tone angle ( H*) were performed using an X-Rite Model SP62 spectrophotometer before and at the end of the QUV accelerated aging treatment. The results showed that QUV aging caused a decrease in the L* value and a change in the surface color of all the finishing pairs studied. For wood / finishing couples with Quercus robur as a wooden support, the couple Quercus robur / F3 has the best resistance to color change, while for couples wood / finish with Pinus sylvestris as a wooden support, the couple Pinus sylvestris / F1 has the best resistance to color change.Key words: Wood, finish, gloss, color, accelerated aging, QUV.Résumé. La durabilité des finitions extérieures sur le bois n'est pas assurée avec les systèmes employés actuellement. Ainsi, l'objectif de cette étude était d'évaluer le changement de couleur des finitions appliquées aux bois, les plus commercialisés au Maroc, dans le but de trouver le couple bois-finition qui présente la meilleure durabilité en utilisation extérieure. Des tests de vieillissement accéléré au QUV ont été réalisés pendant 2016 heures, selon la norme (NF 927-6 2006), sur le pin sylvestre (Pinus sylvestris) et le chêne pédonculé (Quercus robur) revêtus de quatre finitions (deux finitions polyuréthanes F1 et F2 et deux finitions acryliques F3 et F4). Les mesures colorimétriques dans le système de couleur CIELab: La brillance (L*), les coordonnées vert-rouge (a*) et bleu-jaune (b*), la saturation des couleurs (C*) et l'angle de tonalité (H*) ont été réalisées à l'aide d'un spectrophotomètre X-Rite Model SP62, avant et à la fin du traitement de vieillissement accéléré au QUV. Les résultats ont montré que le vieillissement au QUV a provoqué une diminution de la valeur de L* et une modification de la couleur de surface de tous les couples de finition étudiés. Pour les couples bois/finition avec le Quercus robur comme support en bois, le couple Quercus robur / F 3 présente la meilleure résistance au changement de couleur, alors que pour les couples bois / finition avec le Pinus sylvestris comme support en bois, le couple Pinus sylvestris / F 1 présente la meilleure résistance au changement de couleur.

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THERMAL MODIFICATION OF Eucalyptus grandis WOOD: VARIATION OF COLORIMETRIC PARAMETERS

Cited by 24 publications

References 10 publications

Discolouration of heat-treated fast-growing eucalyptus wood exposed to natural weathering

Discolouration of heat-treated fast-growing eucalyptus wood exposed to natural weathering

Prediction of Colour Change of Thermally Modified Wood by near Infrared Spectroscopy

Effect of artificial aging at QUV on the color of finish treated woods of Pinus sylvestris and Quercus robur

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