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    Determination of diagonal compression and tension performances for case furniture corner joints constructed with wood biscuits
    (Elsevier Sci Ltd, 2009) Atar, Musa; Ozcifci, Ayhan; Altinok, Mustafa; Celikel, Uzeyir
    This study was carried out to determine the performance of different wood biscuits on the diagonal compression and tension strength for case-type furniture corner joints. For this purpose, melamine-coated particleboard (MCP) and melamine-coated fiberboard (MCF) panels were bonded with polyvinyl acetate (PVAc)and Desmodur VTKA (DVTKA) adhesives on miter joint (Mj) and butt joints (Bj). The diagonal compression and tension strength tests were done according to ASTM D 1037 standards. As a result, the highest diagonal compression and tension strength were obtained in MCF with DVTKA adhesive, As for the interactions, panel + adhesive + corner joints, the highest value was MCF + DVTKA + miter joint in both compression and tension tests. According to these, it is advised that the member of the wood biscuits produced from solid woods is used in the corner joints in case furniture. (C) 2008 Elsevier Ltd. All rights reserved.
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    DETERMINATION OF THE EFFECTS OF WOOD TYPES AND IMPREGNATION PROCESS IN PERFORMANCE OF THE WINDOW FRAMES CORNER JOINTS
    (Slovak Forest Products Research Inst, 2013) Altinok, Mustafa; Doruk, Semsettin; Arslan, Ali Riza; Gurleyen, Levent
    This study examines the effects of wood types and impregnation (procedure types and process time) in performance of window frames corner joint with double tenon. For this purpose, L corner joint type samples (number 120) were manufactured by using Scotch pine (Pinus sylvestris Lipsky), oak (Quercus petreaea Lipsky) and black locust (Robinia pseudoacacia Polyvinyl acetate based (two kompenant-D4) adhesive were used to bond tenon and mortise corner joints. The samples were impregnated by using the method of immersion for 20 and 40 min with mixture of wax / linseed oil (3 % paraffin, 10 % linseed oil, 87 % white spirit) and imersol aqua. The diagonal compression test was applied to test samples (determine performance of the window frames corner joint) according to ASTM-D 143-83 1983 standards. Finally, the highest diagonal compression performance was obtained on black locust samples (7480.016 N) with the immersol aqua impregnated for 40 min. The lowest diagonal compression performance was received on oak samples (2572.706 N) which were impregnated in white mixture of wax / linseed oil for 40 min.
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    EFFECTS OF SOME ENVIRONMENTALLY-FRIENDLY FIRE-RETARDANT BORON COMPOUNDS ON MODULUS OF RUPTURE AND MODULUS OF ELASTICITY OF WOOD
    (State Forest Products Research Inst, 2009) Toker, Hilmi; Baysal, Ergun; Simsek, Hakan; Senel, Ahmet; Sonmez, Abdullah; Altinok, Mustafa; Ozcifci, Ayhan
    This study was designed to determine some mechanical properties such as modulus of rupture (MOR) and modulus of elasticity (MOE) of wood treated with some environmentally-friendly fire-retardant boron compounds. Sodium perborate (SP) boric acid, (BA), and borax (BX) were used as boron compounds. Wood specimens were prepared from Calabrian pine (Pinus brutia Ten.) and beech (Fagus orientalis Lipski) wood. Before MOR and MOE tests, wood specimens were impregnated with aqueous solutions (1, 2, 3, 4, 5, and 6 %) of berates according to ASTM D 1413-76. Our results showed that MOR values of wood specimens treated with borates were lower compared to untreated control specimens. The MOR and MOE values of wood specimens were the lowest for treatments with SP followed by BX and BA, respectively. In general, the higher concentration levels of borates, the lower MOR of wood resulted.
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    AN INVESTIGATION ON COMPRESSION PARALLEL TO GRAIN VALUES OF WOOD IMPREGNATED WITH SOME BORON COMPOUNDS
    (Slovak Forest Products Research Inst, 2008) Toker, Hilmi; Baysal, Ergun; Ozcifci, Ayhan; Altinok, Mustafa; Sonmez, Abdullah; Yapici, Fatih; Altun, Suat
    This study was carried out to determine compression strength parallel to grain of wood impregnated with some boron compounds. Sodium perborate (SP) boric acid, (BA), and borax (BX) were Used as boron compounds. Wood specimens were prepared from Calabrian pine (Pinus brutia Ten.) and beech (Fagus orientalis L.) wood. Before compression test parallel to grain, wood specimens were impregnated with aqueous solutions (1, 2, 3, 4, 5, and 6 %) of boron compounds according to ASTM D 1413(1976). Results showed that compression strength parallel to grain values of wood specimens treated with boron compounds were lower compared to untreated control specimens. Borate treatments reduced compression strength parallel to grain of wood in significant level compared to untreated control. The compression strength parallel to grain values of wood specimens were the highest for untreated control specimen followed by BA, BX, and SP treated wood specimens, respectively. In general, our results showed that the higher concentration levels of boron compounds, the lower compression strength parallel to grain values of wood resulted.