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https://hdl.handle.net/20.500.12684/6985

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    EVALUATING THE SURFACE ROUGHNESS OF HEAT-TREATED WOOD CUT WITH DIFFERENT CIRCULAR SAWS
    (North Carolina State Univ Dept Wood & Paper Sci, 2011) Budakçı, Mehmet; İlçe, Abdullah Cemil; Korkut, Derya Sevim; Gürleyen, Tuğba
    The effects of different circular saws on surface roughness were determined for heat-treated wood, including Scots pine (Pinus sylvestris L.), eastern beech (Fagus orientalis L.), Uludag fir (Abies bornmulleriana Mattf.), and sessile oak (Quercus petraea L.), which are used commonly in Turkey. Samples were heat-treated for 3, 5, or 7 hours at 140 or 160 C, and cut with circular saws with 28, 48, 60, 72, or 96 teeth. Then, the surface roughness of the samples was determined using a scanning device (TIME TR200) with respect to the ISO 4287 standard. Heat treatment increased the surface roughness of the wood used, and changed the colour of the wood. To obtain smooth surfaces with or without heat treatment, a circular saw with 28 teeth and a double chamfered (WZ) mouth profile is recommended.
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    EFFECTS OF THERMAL AGING ON THE FILM HARDNESS OF SOME WOOD VARNISHES
    (North Carolina State Univ Dept Wood & Paper Sci, 2011) Sönmez, Abdullah; Budakçı, Mehmet; Demirci, Zafer; Akkuş, Memiş
    This study was performed to determine the effects of thermal aging on the film hardness of some wood varnishes. For this purpose, Scots pine (Pinus sylvestris L.), Eastern beech (Fagus orientalis L.), and oak (Quercus petraea L.) samples coated with synthetic (alkyd), two-part polyurethane (urethane-alkyd), and waterborne (self cross-linked polyurethane) varnishes were evaluated at a moisture content of 8% and 12%. Afterwards, thermal aging processes were performed for periods of 25, 50, 75, and 100 days at 25 degrees C, 50 degrees C, 75 degrees C, and 100 degrees C. Hardness changes in the varnish films were measured in accordance with ISO 1522-2006. According to the test results, the samples prepared with polyurethane varnishes at 8% moisture content give the best results.