Abstract
In this study, the color effects of wood materials to coloring with different application methods (brush, roller sponge and spray gun) and waterborne varnishes were investigated according to ASTM-D 2244. For this purpose, the experimental samples of Scots pine (Pinus silvestris L.), oriental beech (Fagus orientalis L.) and oak (Quercus petreae L.), which are commonly used woods in the carpentry and furniture industry in Turkey, were prepared and varnished with one and two-pack waterborne varnishes in accordance with ASTM D 3023. According to the result of the research, significant color changes in coloring as red and yellow tones on the sample surfaces of varnished wood materials were found. The highest color change was obtained in the samples of oak, when varnished with brush and spray gun while the lowest value was obtained in roller sponge in respect to the application methods for waterborne varnishes. However, the application method of spray gun for self crosslinked polyurethane, topcoat-clear, (SCPt) gave the highest metric chroma value among the three different application methods.
Highlights
Wood is widely used as a natural raw material in building, construction, carpentry, furniture and decoration industries
The highest color change was obtained in the samples of oak, when varnished with brush and spray gun while the lowest value was obtained in roller sponge in respect to the application methods for waterborne varnishes
The metric chroma values for varnishing the different wood types with different applying methods were statically found meaningful at 95 % confidence level (α = 0.05) with the exception of wood type and application method interaction
Summary
Wood is widely used as a natural raw material in building, construction, carpentry, furniture and decoration industries. In spite of high need for wood protection and maintaining its natural appearance in the related sectors, there are number of factors to reach and maintain the desired natural appearance of wood. As one of the main parameter, may occur because of bruises on living parts of the tree, formation of dead knots, diseases and so forth. The oxidation of some chemicals in wood, the formation of heartwood in older trees and metal contact with tannin wood is known to cause changes in the natural color of wood. By the chemical degradation of extractive materials and lignin in wood, yellow and brown colors occur and these modifications accelerate in open air conditions (Anderson et al, 1991)
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