Browsing by Author "Kesik H."

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Characteristics of a protective layer on oil heat-treated scots pine and fir wood
(2017-05-01) Kesik H.; Özkan O.; Öncel M.
Effects of natural weathering were studied relative to the adhesion strength, surface hardness, and color change of coated heat-treated and untreated Turkish fir and Scots pine wood. For this study, water-based coatings (varnish and paint) were applied on heat-treated samples. The coated heat-treated, and untreated samples were naturally weathered for one year. The difference between several properties such as adhesion strength, hardness, and color were measured before and after weathering. The test results showed that varnished heat-treated samples had good performance as compared to those of the untreated samples.
Effect of the heat treatment on the adhesion strength of water based wood varnishes
(2015-01-01) Kesik H.; Akyildiz M.
Effects of heat treatment on the adhesion strength of water based wood varnish were studied using four tree species woods [Anatolian black pine (Pinus nigra J.F. Arnold subsp. nigra var. caramenica (Loudon) Rehder), Calabrian pine (Pinus brutia Ten.), Sessile oak (Quercus petraea Liebl.) and Sweet chestnut (Castanea sativa Mill.)] and two components water based varnish (one-component semi-matte and two-component glossy water-based varnish). Those tree species' woods were selected randomly from timber merchants as test materials because of their wide use in industry. Under atmospheric pressure, the wood samples were subjected to three different temperatures (130, 180 and 230°C) at two different time intervals (2 and 8 h). After that, the wood samples were coated with two components water-based varnish. Adhesion strength of varnish film was then measured with a pull-off test according to the ASTM-D 4541 (1995). The coatings presented the highest adhesion strength (3.33 MPa) on oak wood, followed of the adhesion strength on chestnut (2.1 MPa) and on pine species (black pine 1.78 and Calabrian pine 1.65 MPa) Sessile oak wood showed the highest adhesion strength (3.33) followed by Sweet chestnut (2.19) and pine species (Anatolian black pine 1.78 and Calabrian pine 1.65 MPa). The adhesion strength of all wood types decreased increasing temperature and time.