Effects of heat treatment systems on the physical properties of coated Scots pine (Pinus sylvestris L.) and poplar (Populus euramericana)

Can, Ahmet

doi:10.15376/biores.15.2.2708-2720

Cited by 10 publications

(8 citation statements)

References 25 publications

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“…In the literature, there are studies indicating that heat treatment decreases the density and surface roughness of wood material with increasing temperature and duration (Ünsal and Ayrılmış 2005;Korkut and Budakçı 2010;Budakçı et al 2013;Kesik et al 2014;Pelit 2014). Can (2020) reported that the reason for the decrease in surface roughness with heat treatment is the degradation of hemicellulose in the cell wall due to the applied high temperature. Pelit et al (2015) reported that the surface roughness value increased depending on the increase in the heat treatment temperature.…”

Section: Resultsmentioning

confidence: 99%

Effect of treatment temperature on the initial performance of layers of water-based paints in heat-treated pine and beech wood

Karamanoğlu

Birinci

Kesik

et al. 2022

BioRes

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Hardness, surface roughness, and adhesion strength were determined for water-based opaque paints applied to heat-treated wood material surfaces. For this purpose, Scotch pine (Pinus sylvestris L.) and beech (Fagus orientalis Lipsky) woods were used as experimental material. Specimens were subjected to heat treatment at 3 different temperatures (150, 180, and 210 °C) and 2 different periods (2 and 4 h) under laboratory conditions. Two-component water-based paints with commercial codes D17 and D45 were applied to the surfaces. The hardness, surface roughness, and adhesion strength values of painted samples were determined according to the applicable standards. The results showed that there were higher values of hardness and surface roughness of water-based paints in short-term heat treatment compared with long-term heat treatment. A general decrease in pine with D17 and D45 paints applied to the surfaces and in beech with D45 in adhesion strength was detected depending on the increasing heat treatment temperature and duration. An increase was observed in beech samples with D17 paint applied.

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Section: Resultsmentioning

confidence: 99%

Effect of treatment temperature on the initial performance of layers of water-based paints in heat-treated pine and beech wood

Karamanoğlu

Birinci

Kesik

et al. 2022

BioRes

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“…The use of coatings may change this trend. Can [71] investigated the effect of modification and finishing of pine and poplar wood on the gloss value. It has been shown that the modification process has a negative effect on the gloss value, and the use of a water-based (AQUA), polyurethane-based (PUR), and an oil/wax-based (OIL + WAX) coating results in a slight reduction of the gloss value.…”

Section: Parameters Determined After Finishingmentioning

confidence: 99%

Influence of Thermal Modification in Nitrogen Atmosphere on Physical and Technological Properties of European Wood Species with Different Structural Features

et al. 2022

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The wood of five European species: black poplar (Populus nigra L.), European beech (Fagus sylvatica L.), European ash (Fraxinus excelsior L.), European oak (Quercus robur L.), and Scots pine (Pinus sylvestris L.) was subjected to thermal modification in nitrogen atmosphere at 190 °C during 6 h. Native and modified wood was varnished and oiled in industrial conditions. Thermally modified (TM) wood was characterized by a greater absorption of varnish and oil when applying the first layer to the surface, which finally resulted in higher application values compared to native wood. In particular, after varnishing, there was a significant increase in gloss and radical change of colour. Regardless of the wood species, finishing process (varnishing, oiling), the ΔE values were close to or higher than 6, which proves high colour changes. Modified poplar, ash, and oak after varnishing had a different colour (ΔE higher than 12). The surface colour changes as a result of UV photoaging was individual, depending on the wood species and the method of finishing. In the case of the thickness of varnish coatings, the wood structure was important, i.e., on ring-porous hardwood and softwood they were thicker. In the case of wood species with a lower density, i.e., black poplar and pine, the thermal modification in nitrogen atmosphere process did not reduce the resistance of the varnish coat, and in the case of species with a higher density (oak, ash, beech) it decreased by one level. Thermal modification reduced the Brinell hardness of wood with wide rays (oak and beech) by 11%. The applied process of surface finishing by double varnishing or oiling did not significantly change the hardness of tested wood.

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“…17,25 This was because for GL per measurement the device prevented light reflection as the measuring light struck the fibers, and therefore, resulting in the lower value. 25 When the incident light is perpendicular to the grain, part light is blocked by the cell wall when it enters the cell cavity as the diameter of the cell cavity is far smaller than its length. The reflected light has a greater degree of scattering and results in a lower gloss.…”

Section: Gloss Distribution Change Of Wood Due To Heat Treatmentmentioning

confidence: 99%

“…24 Concerning the gloss change caused by HT, it has been reported that the gloss of wood materials decrease after the treatment. [25][26][27] Wood density is one of the important sources of property variation in a wood species and is one of the first to be considered when assessing wood quality as its high correlation with other properties of wood and the processing processes, including cutting, gluing, finishing, and drying. 28,29 For instance, wood has been widely used in the wood-based flooring industry.…”

Section: Introductionmentioning

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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Effects of heat treatment systems on the physical properties of coated Scots pine (Pinus sylvestris L.) and poplar (Populus euramericana)

Cited by 10 publications

References 25 publications

Effect of treatment temperature on the initial performance of layers of water-based paints in heat-treated pine and beech wood

Effect of treatment temperature on the initial performance of layers of water-based paints in heat-treated pine and beech wood

Influence of Thermal Modification in Nitrogen Atmosphere on Physical and Technological Properties of European Wood Species with Different Structural Features

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

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