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    DIAGONAL TENSILE STRENGTH OF AN ORIENTED STRAND-BOARD (OSB) FRAME WITH DOVETAIL CORNER JOINT
    (North Carolina State Univ Dept Wood & Paper Sci, 2010) Özkaya, Kadir; Burdurlu, Erol; İlçe, A. Cemil; Ciritcioğlu, Hasan Hüseyin
    It was aimed in this study to determine the effect of the number of joints in frames produced from Oriented Strand Board (OSB) and of the type of adhesive on the diagonal tensile strength (DTS) of the frame. With this objective, a total of 152 specimens were prepared from OSB in accordance with the principles in the EN 2470 test standard. The diagonal tensile test was applied to the specimens in the universal test equipment in accordance with ASTM-D 1037. According to the statistical analysis of the data obtained from the tests, the number of dovetail joints and the type of adhesive had significant effects on the DTS. The highest DTS (0.117 N/mm(2)) was obtained in the specimens with a single dovetail joint and bonded with the PVAc adhesive. This alternative was followed by the specimens with a double dovetail joint bonded with the PVAc adhesive (0.078 N/mm(2)) and the specimens with a single dovetail joint bonded with the PU adhesive (0.073 N/mm(2)). The lowest DTS occurred in the specimens with single and double joints without adhesive. According to these results, adhesive should definitely be used in the corner joining of the dovetail joints, and the single dovetail joint joining type bonded with PVAc adhesive is preferred.
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    Surface roughness and brightness of scots pine (Pinus sylvestris) applied with water-based varnish after densification and heat treatment
    (Springer Japan Kk, 2015) Pelit, Hüseyin; Budakçı, Mehmet; Sönmez, Abdullah; Burdurlu, Erol
    This research was aimed at determining the surface roughness and surface brightness properties of Scots pine (Pinus sylvestris L.) wood samples to which water-based varnishes were applied after thermo-mechanical densification and heat treatment. Samples; after densifying by compression in the radial direction at two different rates (20 and 40 %) and two different temperatures (110 and 150 A degrees C), samples were subjected to 2 h of heat treatment at 190, 200, and 210 A degrees C. Then, surface of the samples was varnished with one-component (OCW) and two-component (TCW) water-based varnishes. The changes occurring in surface roughness and surface brightness of the samples were determined according to the basis of TS 2495 EN ISO 3274, TS 6212 EN ISO 4288 and TS EN ISO 2813. According to results of the research, surface roughness decreased and surface brightness increased in densified samples. On the other hand, an increase in the heat treatment temperature led to an increase in surface roughness and a decrease in surface brightness. Also, regarding the effect of varnish type on both surface roughness and surface brightness, better results were obtained in the surface OCW applied compared to those TCW applied.