Yazar "Budakci, Mehmet" seçeneğine göre listele
Listeleniyor 1 - 8 / 8
Sayfa Başına Sonuç
Sıralama seçenekleri
Öğe Assessment of Surface Roughness in Milling of Wood with Different Material Temperature and Cutting Parameters(North Carolina State Univ Dept Wood & Paper Sci, 2024) Korkmaz, Mustafa; Budakci, Mehmet; Kilinc, IzhamEffects of wood temperature were studied during CNC router processing relative to the resulting surface roughness, addressing a considerable gap in wood machining research. Three wood species (Scots pine, beech, and poplar) were machined at four temperatures (-20 degrees C, 0 degrees C, 20 degrees C, and 50 degrees C) to simulate diverse climatic conditions. The experiments were conducted at varied spindle speeds (6000, 12000, and 18000 rpm) and feed rates (3000 and 6000 mm/min). Surface roughness was measured using a portable tester in accordance with relevant ISO standards. A full factorial design was used to evaluate the effects of wood species, temperature, spindle speed, and feed rate on surface roughness. Results revealed a strong correlation between processing temperature and surface roughness, with a 25.9% increase in roughness observed as temperature rose from-20 degrees C to 50 degrees C. This temperature effect was consistent across all wood species, though its magnitude varied. The study also found that wood type, spindle speed, and feed rate significantly influenced surface quality, interacting with temperature effects. These findings suggest that controlling wood temperature during processing could be crucial for maintaining consistent surface quality in industrial applications, especially in facilities operating under variable environmental conditions.Öğe Determination of color-changing effects of bleaching chemicals on some heat-treated woods(Springer Japan Kk, 2020) Akkus, Memis; Budakci, MehmetThe 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.Öğe Determination of Gloss in Decorative Coated Wood-based Composite Boards by Image Processing Method(North Carolina State Univ Dept Wood & Paper Sci, 2025) Katircioglu, Ferzan; Budakci, Mehmet; Kacamer, SerdarUltraviolet (UV)-cured coating and water transfer printing (WTP) are popular organic coating techniques offering aesthetic and functional benefits for wood-based panels. This study considered the gloss change of medium density fiberboard (MDF) panels, which were coated with WTP and UV printing processes. Image processing was used before and after being exposed to some domestic cleaning agents. A carbon fiber-patterned organic finish was applied to the surfaces of the prepared sample panels followed by scrub-testing with various domestic cleaning agents in compliance with Turkish Standards (TS) EN ISO 11998. The image processing based scrubbing tester (IPBST) developed in this study was used for the scrubbing process. Digital images of the samples were captured before and after the scrubbing process, and the Red-Green-Blue (RGB) color model was converted to the Hue-Saturation-Intensity (HSI) model for analysis. The /-channel in the HSI system was used to calculate the average gloss values, which were compared to results from the BYK-Gardner Spectro-Guide 45/0 device. Pearson correlation analysis indicated a robust and statistically significant correlation of 0.71. As a result, the image analysis-based gloss evaluation method has been shown to enable a more comprehensive evaluation of surface quality by providing fast, non-contact, and detailed analysis.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, MehmetAn 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.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, MustafaThe 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.Öğe Image Processing Based Scrub Tester Design and Production(Zagreb Univ, Fac Forestry, 2025) Kacamer, Serdar; Budakci, Mehmet; Katircioglu, Ferzancenter dot Determining how resistant paint, varnish or coating type materials, applied to wood-based panel surfaces, are to the effects of exposure to household chemicals is important in terms of developing products and providing durable surface coating to users. Every paint or coating type product coming off the production line needs to be tested quickly, and a new direction should be given to the work based on the positive or negative results obtained. Products without quality monitoring are returned by customers due to insufficient performance, resulting in loss of time, labor and materials. In this study, an Image Processing Based Scrub Tester (IPBST) was designed and produced in order to imitate the effect of paint, varnish and coating materials on the surfaces of furniture and decoration elements used in daily life against household chemicals. Unlike its counterparts, with IPBST, the image of each sample is digitally recorded before and after the scrubbing process, thanks to the compact photo booth integrated into the device. Wear, color and brightness change analyses of sample images can be performed with the Surface Flaw Analysis (SFA) method developed using the Matlab Graphical User Interface (GUI) image processing program on a computer integrated into the device. In this way, a 4-in-1 device that can do the job of 4 devices has been provided to the relevant scientific community and industry without the need for different types of industrial test devices.Öğe Laminated Wood Material Reinforced with Bacterial Cellulose Sheets Derived from Kombucha Pellicles: Part 1 Some Physical Properties(North Carolina State Univ Dept Wood & Paper Sci, 2025) Budakci, Mehmet; Sagban, Digdem; Korkmaz, Mustafa; Kilinc, IzhamIn this study, the usability of kombucha pellicles as a source of bacterial cellulose (BC) in the production of laminated wood was investigated to improve its physical properties. Within this scope, the kombucha culture was produced at room temperature through a fermentation process of approximately 25 days and then dried to obtain BC sheets with a thickness of approximately 1 mm. These sheets were used in the production of laminated wood material, along with wood species of Scots pine (Pinus sylvestris L.), Oriental beech (Fagus orientalis L.), and Anatolian chestnut (Castanea sativa Mill.), using urea-formaldehyde, polyurethane, and polyvinyl acetate adhesives. To evaluate the physical properties of the manufactured samples, density, thickness swelling, and water absorption tests were performed. Furthermore, the structural and thermal properties of the BC were analyzed using scanning electron microscopy and thermogravimetric analysis techniques. The findings indicated that BC is a high-performance biomaterial for lamination. The results unveiled BC's remarkable potential for developing eco-friendly materials, though certain technical challenges remain to be addressed before its full capabilities can be realized.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, MehmetThe 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.
