Yazar "Budakci, Mehmet" seçeneğine göre listele

Listeleniyor 1 - 4 / 4
  • Küçük Resim
    Öğe
    Determination of color-changing effects of bleaching chemicals on some heat-treated woods
    (Springer Japan Kk, 2020) Akkus, Memis; Budakci, Mehmet
    The aim of this study was to use bleaching chemicals to remove the discoloration occurring on the surface of wood after heat treatment in order to restore the natural color of the wood. For this purpose, samples prepared from Scots pine (Pinus sylvestrisL.), sessile oak (Quercus petraeaL.), Eastern beech (Fagus orientalisL.), and Uludag fir (Abies bornmuellerianaMattf.) were exposed to heat treatment at temperatures of 140 and 160 degrees C for time periods of 3, 5, and 7 h. Bleaching solutions S1 (NaOH + H2O2), S2 (NaSiO3 + H2O2), and S3 (H2C2O4) at a concentration of 18% were then applied to the surface of the materials and the color change was determined according to ASTM D 2244 standard. Depending on the heat treatment temperature and duration, an increase in total color change values was detected on the surfaces of the materials and the color of the samples became darker. The total color change values decreased after bleaching with the S2 solution in the heat-treated Scots pine and fir samples, with the S3 solution in the beech samples, and with the S1, S2, and S3 solutions in the oak samples. The findings showed that by using bleaching chemicals to lighten wood materials darkened after heat treatment, it is possible to obtain results close to the natural color values.
  • Küçük Resim Yok
    Öğe
    Determining Abrasion Resistance of Decorative Coated Wood-Based Panels Using Retinex Model
    (North Carolina State Univ Dept Wood & Paper Sci, 2024) Kacamer, Serdar; Katircioglu, Ferzan; Budakci, Mehmet
    An Image Processing Based Scrub Tester (IPBST) was used to imitate the effect of household chemicals on furniture and decoration elements. For this purpose, 8 mm -thick, bright white, acrylic coated medium density fiberboard (MDF), polyvinyl chloride coated MDF, MDF lam ready -to -use sheets, and cellulosic, polyurethane, acrylic, and water -based paint applied MDF sheets were used. Carbon fiber patterned decorative coating was applied to the prepared sample surfaces using the water transfer printing and ultraviolet printing methods. The surfaces of the samples were scrubbed with various household chemicals in accordance with the Turkish Standard TS EN ISO 11998. In the image processing phase, the images before and after scrubbing were first converted to hue, saturation, and value color space. The relationship between the abrasion measurement method of the proposed IPBST and the abrasion data obtained from the stereo microscope device was examined using the Pearson Correlation analysis. The relationship between both abrasion test methods was positive, very strong, and significant (0.81). Thus, the IPBST can be used as an alternative to industrial test devices as it obtains similar data.
  • Küçük Resim
    Öğe
    Effects of Thermo-Vibro-Mechanic (R) Densification on the Density and Swelling of Pre-Treated Uludag Fir and Black Poplar Wood
    (North Carolina State Univ Dept Wood & Paper Sci, 2021) Budakci, Mehmet; Senol, Suleyman; Korkmaz, Mustafa
    The radial and tangential swelling as well as the fully dried density of low-density wood materials densified via the Thermo-Vibro-Mechanic (R) method were evaluated in response to applying wood stain and preservative. The samples obtained from Uludag fir (Abies bornmuelleriana Mattf.) and black poplar (Populus nigra L.) in the radial and tangential direction were pre-treated with wood stain and preservative before undergoing Thermo-Vibro-Mechanic (R) densification. Thermo-Vibro-Mechanic (R) densification was performed at three different temperatures (100 degrees C +/- 3 degrees C, 120 degrees C +/- 3 degrees C, and 140 degrees C +/- 3 degrees C), three different vibration pressures (0.60 MPa, 1.00 MPa, and 1.40 MPa), and three different vibration times (20 s, 60 s, and 100 s). Afterwards, changes in the fully dried density and swelling amounts in the radial and tangential directions of the samples were determined. The fully dried density increased by 15.4% to 38% and the radial and tangential swelling amounts increased by 73.2% to 242.6%, when the densified samples were compared to the control samples. In general, the fully dried density and swelling values increased depending on the Thermo-Vibro-Mechanic (R) densification parameters; higher values were found as the compression ratio and total application time increased.
  • Küçük Resim
    Öğe
    Surface Roughness of Thermally Treated Wood Cut with Different Parameters in CNC Router Machine
    (North Carolina State Univ Dept Wood & Paper Sci, 2021) Pelit, Hüseyin; Korkmaz, Mustafa; Budakci, Mehmet
    The effects of different machining parameters on surface roughness values of thermally treated pine, beech, and linden woods cut in a computer numerical control (CNC) router machine were examined. Wood specimens were thermally treated at 170, 190, and 210 degrees C for 2 h. Then, specimens were cut in the radial and tangential directions with three different spindle speeds (12000, 15000, and 18000 rpm) and three different feed rates (3000, 4000, and 6000 mm/min) using two different end mill tools (spiral and straight) on the CNC machine. The end mill type significantly affected the roughness values of the untreated and thermally treated specimens in both directions. Lower roughness values were found in the specimens (especially pine) machined with the straight end mill compared to those machined with the spiral end mill. Roughness generally decreased in the thermally treated specimens. However, thermal treatment temperature did not have a notable effect on roughness. As the spindle speed increased, the roughness values of all specimens decreased. In contrast, as the feed rate increased, the roughness values increased. Therefore, the end mill type, feed rate, and spindle speed were the most influential parameters on the roughness.