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    The effect of natural weathering on change in the color of heat treated and varnished scots pine and oriental beech woods
    (Slovak Forest Products Research Inst, 2018) Kart, Saban; Baysal, Ergün; Türkoğlu, Türkay; Küçüktüvek, Mustafa; Peker, Hüseyin; Altay, Çağlar; Gündüz, Ahmet; Toker, Hilmi
    This study was designed to investigate color changes of heat treated and varnished Scots pine (Pinus sylvestris L.) and Oriental beech (Fagus orientalis L.) after 3 months of weathering. Heat treatment of Oriental beech and Scots pine wood was carried out by hot air in an oven for 1, 2, and 3 hours at 205, 215, and 225 degrees C. After heat treatment, wood specimens were varnished using a polyurethane varnish (PV) and cellulosic varnish (CV). The results of study showed that heat treatment generally caused decrease of lightness of both wood specimens before weathering. In general, while heated and PV coated Scots pine and Oriental beech wood surfaces turned to reddish and yellowish, heated and CV coated Scots pine and Oriental beech wood surfaces turned to reddish and bluish after weathering. The total color changes of heated and varnished both wood specimens were lower than only varnished both wood specimens after weathering.
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    Some surface characteristics of varnished thermowood after weathering
    (Slovak Forest Products Research Inst, 2019) Kart, Saban; Baysal, Ergün; Küçüktüvek, Mustafa; Türkoğlu, Türkay; Toker, Hilmi; Altay, Çağlar; Cibo, Cihan; Peker, Hüseyin
    This study was designed to investigate some surface characteristics such as glossiness and surface roughness changes of varnished thermowood after six months of weathering. Thermal modification of Scots pine (Pinus sylvestris L.) and Oriental beech (Fagus orientalis L.) wood were carried out by hot air in an oven for 1, 2, and 3 hours at 205, 215, and 225 degrees C. After the modification process, wood specimens were varnished using a polyurethane varnish (PV) and cellulosic varnish (CV). The natural weathering process caused an increase in the surface roughness of the test specimens according to the test results. The Scots pine and Oriental beech test specimens which were heat treated and varnished gave more favorable results compared to only varnish test specimens after natural weathering in terms of surface characteristics such as surface roughness and glossiness. Generally, as the heat treatment time and temperature increase, it is observed that the surface characteristics of the Scots pine and Oriental beech wood specimens improve positively. According to the results of the tests, the samples varnished with polyurethane varnish gave better results in terms of surface roughness at the end of the natural weathering process, whereas the samples varnished with cellulosic varnish gave better results in terms of glossiness values.
  • Küçük Resim
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    Surface characteristics of oriental beech and scots pine woods heat-treated above 200°c
    (Slovak Forest Products Research Inst, 2016) Toker, Hilmi; Baysal, Ergün; Türkoğlu, Türkay; Kart, Saban; Şen, Faruk; Peker, Hüseyin
    Heat-treated of Oriental beech (Fagus orientalis L.) and Scots pine (Pinus sylvestris L.) woods were carried out by hot air in an oven for 1, 3, and 5 hours at 205, 220, and 235 degrees C. After heat treatments, some surface properties such as color and gloss changes of both wood specimens were evaluated. Our results showed that heat treatment caused decrease in gloss values of Oriental beech and Scots pine wood specimens. Higher treatment temperature and duration resulted in higher gloss loss of wood specimens after heat treatments. Heat-treated wood became darker tonality, especially; it became more darkening after 3 and 5 hours heat treatments. Generally according to our results, Delta a* and Delta a* decreased after heat treatments. Oriental beech wood tended to become less reddish than Scots pine after heat treatments. Delta a*, Delta b* and Delta E* of heat-treated Oriental beech and Scots pine decreased with increasing treatment temperature and duration.