Correlation and modeling between color variation and quality of the surface between accelerated and natural tropical weathering in Acacia mangium, Cedrela odorata and Tectona grandis wood with two coating

Valverde, Juan Carlos; Moya, Róger

doi:10.1002/col.21826

Cited by 24 publications

(23 citation statements)

References 26 publications

Supporting

Mentioning

Contrasting

Order By: Relevance

“…In this study, the overall results of color preferences test revealed that respondents expressed a stronger preference for the darker color of Cui et al (2004) and Valverde and Moya (2014): (1) negligible: ΔE* between 0 to 0.5; (2) slightly perceivable: ΔE* between 0.5 to 1.5; (3) noticeable: ΔE* between 1.5 to 3.0; (4) appreciable: ΔE* between 3.0 to 6.0; (5) very appreciable: ΔE* between 6.0 to 12.0; and (6) totally changed: ΔE* more than 12.0. …”

Section: Consumer Preferences Towards Colors Of Heat-treated Woodssupporting

confidence: 48%

“…The colorimetric evaluation was performed using the CIE-Lab system (Esteves et al, and the overall color change (ΔE*) were calculated using the following equations, The values of color changes (ΔE*) were then used to define the levels of perceived difference in color (Cui et al, 2004;Valverde and Moya, 2014). ΔE* between 0 to 0.5 is defined as negligible, between 0.5 to 1.5 is slightly perceivable, between 1.5 to 3.0 is noticeable, between 3.0 to 6.0 is appreciable, between 6.0 to 12.0 is very appreciable, and more than 12.0 is totally changed.…”

Section: Color Evaluationmentioning

confidence: 99%

See 1 more Smart Citation

Color Change and Consumer Preferences towards Color of Heat-Treated Korean White Pine and Royal Paulownia Woods

Hidayat¹,

Qi²,

Jang³

et al. 2017

Journal of the Korean Wood Science and Technology

View full text Add to dashboard Cite

Heat treatment of wood is an attractive alternative environmentally-friendly treatment to add value of less valuable woods by improving color, dimensional stability, and natural durability. To improve the color properties of Korean white pine (Pinus koraiensis) and royal paulownia (Pauwlonia tomentosa), we treated the woods at 160℃, 180℃, 200℃, and 220℃ for 2 hours. Color change after heat treatment was evaluated using the CIE-Lab color system and survey was conducted to determine the consumer preferences towards color of heat-treated wood. Lightness (L * ) decreased with increasing temperature and the higher degree of change was obtained in royal paulownia. The red/green chromaticity (a * ) in both wood decreased after heat treatment at 160℃, and constantly increased after heat treatment at 180℃ to 220℃. Yellow/blue chromaticity (b * ) in Korean white pine tended to increase after heat treatment at 160℃, then decreased gradually afterwards. In royal paulownia, b* values linearly increased with increasing temperature. Overall color change (ΔE*) increased with increasing temperature with higher degree obtained in royal paulownia. Samples with the clamps in both wood species showed lower degree of the change in L * , a * , b and ΔE*. The results of the consumer preferences test showed that the darker colors of heat-treated woods were more preferred by consumers compared to the lighter colors of untreated woods. Consequently, heat treatment could enhance the color properties of Korean white pine and royal paulownia woods for value added products.

show abstract

Section: Consumer Preferences Towards Colors Of Heat-treated Woodssupporting

confidence: 48%

Section: Color Evaluationmentioning

confidence: 99%

Color Change and Consumer Preferences towards Color of Heat-Treated Korean White Pine and Royal Paulownia Woods

Hidayat¹,

Qi²,

Jang³

et al. 2017

Journal of the Korean Wood Science and Technology

View full text Add to dashboard Cite

show abstract

“…The levels of perceived difference in color were determined according to Cui et al (2004) and Valverde and Moya (2014), which are as follows: (1) ΔE* between 0 to 0.5 is defined as negligible; (2) ΔE* between 0.5 to 1.5 is slightly perceivable; (3) ΔE* between 1.5 to 3.0 is noticeable; (4) ΔE* between 3.0 to 6.0 is appreciable; (5) ΔE* between 6.0 to 12.0 is very appreciable; and (6) ΔE* more than 12.0 is totally changed.…”

Section: Board Evaluationmentioning

confidence: 99%

Effect of Treatment Duration and Clamping on the Properties of Heat-Treated Okan Wood

Hidayat¹,

Qi²,

Jang³

et al. 2016

BioResources

View full text Add to dashboard Cite

Effects of treatment duration and clamping during heat treatment were evaluated relative to the color and physical and mechanical properties of okan wood. Sapwood and heartwood boards from okan wood were treated with and without clamping for 1 to 4 h at 180 °C. Changes in color were mostly due to a reduction in lightness (L*) and yellow/blue chromaticity (b*). These values decreased more for longer treatment durations. Red/green chromaticity (a*) was not affected by the treatment duration. Weight loss and volume shrinkage increased with increased treatment duration. Density only slightly decreased because of a balanced reduction in weight and volume. Clamping during treatment prevented surfaces from having direct contact with the heated air, which resulted in lower weight loss and volume shrinkage than in the samples treated without clamping. Heat-treated wood absorbed less water than the control group, as suggested by the lower equilibrium moisture content and water absorption. Furthermore, the heartwood absorbed less water than the sapwood. An evaluation of the mechanical properties showed a reduction in both the modulus of rupture and modulus of elasticity after heat treatment. Clamping minimized strength reduction in both sapwood and heartwood, particularly for 1 and 2 h heat treatments.

show abstract

“…The degradation of the coating system on wood's surface differs depending on the climate conditions (Creemers et al 2002;Valverde and Moya 2014), wood species, and other factors. Therefore, it is necessary to test selected coatings on various woods in different regions.…”

Section: Introductionmentioning

confidence: 99%

Effect of the Number of UV-Protective Coats on the Color Stability and Surface Defects of Painted Black Locust and Norway Spruce Woods Subjected to Natural Weathering

Pánek

Reinprecht

2016

BioResources

View full text Add to dashboard Cite

This paper utilized 12 coating systems, based on an acrylate and a hydrophobic polymer, with the addition of light pigments, nano-sized polyvalent metal (AsS-chelate complex) for ultraviolet protection, and iodopropynyl butylcarbamate fungicide. This study deals with the impact of the number of coats on the color stability and the surface defects of painted black locust (Robinia pseudoacacia L.) and Norway spruce (Picea abies Karst L.) woods after up to three years of natural weathering, at a slope of 45°. The best coating system was created from three coats, which consisted of two pigmented acrylates (PerlColor) and one transparent hydrophobic water-repellent (AquaStop). The total color change, ΔE*, of the weathered surfaces was approximately two times lower when the application involved a pigmented coating system compared with a transparent one. The color stability of the surfaces and their resistance to defects was better when the coating system was applied to black locust wood compared with spruce wood. Smoother surfaces of wood before painting resulted in a higher resistance against cracking and other defects caused by natural weathering; however, the effect of the initial wood roughness on the color stability of painted woods during natural weathering was usually negligible.

show abstract

Correlation and modeling between color variation and quality of the surface between accelerated and natural tropical weathering in Acacia mangium, Cedrela odorata and Tectona grandis wood with two coating

Cited by 24 publications

References 26 publications

Color Change and Consumer Preferences towards Color of Heat-Treated Korean White Pine and Royal Paulownia Woods

Color Change and Consumer Preferences towards Color of Heat-Treated Korean White Pine and Royal Paulownia Woods

Effect of Treatment Duration and Clamping on the Properties of Heat-Treated Okan Wood

Effect of the Number of UV-Protective Coats on the Color Stability and Surface Defects of Painted Black Locust and Norway Spruce Woods Subjected to Natural Weathering

Contact Info

Product

Resources

About