Yazar "Akbulut, Turgay" seçeneğine göre listele
Listeleniyor 1 - 8 / 8
Sayfa Başına Sonuç
Sıralama seçenekleri
Öğe Application of Electrostatic Powder Coating on Wood Composite Panels Using a Cooling Method. Part 1: Investigation of Water Intake, Abrasion, Scratch Resistance, and Adhesion Strength(North Carolina State Univ Dept Wood & Paper Sci, 2019) Akkuş, Memiş; Akbulut, Turgay; Candan, ZekiPowder coating is environmentally friendly and safe in terms of human health and is used especially on home appliances and in the automotive sector. Because of these advantages, recent studies have expanded work on the application of powder coating on non-conductive surfaces. Within the scope of this research, low temperature curing (120 degrees C to 130 degrees C) was applied on wood-based composite panels of medium-density fiberboard (MDF), particleboard, and plywood to facilitate conductivity. Epoxy, polyester, and hybrid (epoxy-polyester) types of powder paint and water-based liquid paint (control group) were applied to the surface of materials. Panels coated with the powder coatings were compared to the panels coated with the water-soluble acrylic resin coating. The prepared samples were analyzed for performance properties. The best results for thickness swelling, water absorption, adhesive strength, abrasion, and scratch resistance were found for the plywood coated with water-based liquid paint, MDF coated with polyester-based powder paint, plywood coated with hybrid powder paint, particleboard coated with hybrid powder paint, and plywood coated with epoxy powder paint, respectively.Öğe Compression Wood as a Source of Reinforcing Filler for Thermoplastic Composites(Wiley-Blackwell, 2012) Büyüksarı, Ümit; Ayrılmış, Nadir; Akbulut, TurgayCompression wood (CW) is a reaction wood formed in gymnosperms in response to various growth stresses. Many of the anatomical, chemical, physical, and mechanical properties of CW differ distinctly from those of normal wood. Because of different properties, the CW is much less desirable than normal wood. This study was conducted to investigate the suitability of CW flour obtained from black pine (Pinus nigra Arnold) in the manufacture of wood plastic composite (WPC). Polypropylene (PP) and CW flour were compounded into pellets by twin-screw extrusion, and the test specimens were prepared by injection molding. WPCs were manufactured using various weight percentages of CW flour/PP and maleic anhydride-grafted PP (MAPP). Water absorption (WA), modulus of rupture (MOR), and modulus of elasticity (MOE) values were measured. The results showed that increasing of the CW percentage in the WPC increased WA, MOR, and MOE values. Using MAPP in the mixture improved water resistance and flexural properties. CW flour of black pine can be used for the manufacturing of WPC as a reinforcing filler. (C) 2011 Wiley Periodicals, Inc. J Appl Polym Sci 123: 1740-1745, 2012Öğe Effect of boron and phosphate compounds on physical, mechanical, and fire properties of wood-polypropylene composites(Elsevier Sci Ltd, 2012) Ayrılmış, Nadir; Akbulut, Turgay; Dündar, Türker; White, Robert H.; Mengeloğlu, Fatih; Büyüksarı, Ümit; Avcı, ErkanPhysical, mechanical, and fire properties of the injection-molded wood flour/polypropylene composites incorporated with different contents of boron compounds; borax/boric acid and zinc borate, and phosphate compounds; mono and diammonium phosphates were investigated. The effect of the coupling agent content, maleic anhydride-grafted polypropylene, on the properties of the composites with fire-retardant was also investigated. The composites with the zinc borate had the highest dimensional stability and strength in the bending, tensile, and izod impact, followed by the monoammonium phosphate, borax/boric acid, and diammonium phosphate treatments. The treatments produced modest improvements in fire performance as indicated by reductions in the heat release rates. Best results were achieved with the phosphate treatments. The Scanning Electron Microscope-Energy Dispersive Spectroscopy elemental mapping of the samples revealed that the outer surface of the wood fibers was coated by some crystalline deposits of the fire-retardants. (C) 2012 Elsevier Ltd. All rights reserved.Öğe The effects of some manufacturing factors on surface roughness of sliced Makore (Tieghemella heckelii Pierre Ex A.Chev.) and rotary-cut beech (Fagus orientalis L.) Veneers(Pergamon-Elsevier Science Ltd, 2008) Dündar, Türker; Akbulut, Turgay; Korkut, SüleymanIn this study, the effects of veneer thickness, cutting speed, knife bevel, vertical and horizontal opening, and drying temperature on surface roughness of sliced Makore veneer and rotary-cut beech veneer were evaluated. Makore logs for sliced veneers and beech logs were used for rotary-cut veneers manufacturing. Before veneer manufacturing, the Makore and beech logs were steamed indirectly at 80 degrees C for 50 and 36h, respectively. Roughness measurements were conducted according to DIN standard 4768 by using stylus profilometer. The sliced radial and tangential veneers were grouped and evaluated separately. Results showed that veneer thickness, cutting speed and knife bevel had a significant effect on surface roughness for the sliced veneers, but veneer drying temperature did not affect significantly the surface roughness. In general, surface roughness of the veneer increases with increasing veneer thickness. However, increases in cutting speed decreased the surface roughness. The most suitable knife bevel was 17.5 degrees for manufacturing sliced veneers from Makore. For rotary-cut veneers, vertical and horizontal opening had a significant effect on the surface roughness. The results indicated that vertical opening should be about 50% and horizontal opening about 80-90% of veneer thickness to minimize the surface roughness in manufacturing rotary cut veneer from oriental beech. (c) 2007 Elsevier Ltd. All rights reserved.Öğe Formaldehyde emission, combustion behavior, and artificial weathering characteristics of electrostatic powder coated wood composite panels(Taylor & Francis Ltd, 2021) Akkus, Memis; Akbulut, Turgay; Candan, ZekiRecently, research and development works have expanded to include the application of electrostatic powder coatings on non-conductive materials such as plastic, wood, and wood-based composite panels. Within the scope of this research, low temperature curing (120-130 degrees C) was applied to wood-based composite panels of medium-density fiberboard (MDF), particleboard, and plywood panels to facilitate conductivity. Epoxy, polyester, and hybrid (epoxy-polyester) types of powder coating and waterborne acrylic liquid coating were applied to the surface of the materials. The panels coated with the powder coatings were compared to the panels coated with the waterborne acrylic resin coating (control group). Combustion behaviors was determined according to ISO 13927 standard, formaldehyde emission according to TS EN 717-2, and color and gloss changes after accelerated weathering according to ASTM G151 and ASTM G154. The best results for combustion behavior were obtained with the plywood panels and MDF panels coated with waterborne acrylic coating, for formaldehyde emission with plywood panels coated with epoxy powder coating and waterborne acrylic coating and plywood panels, MDF panels, and particleboard coated with polyester powder coating. The least color change and gloss loss were detected in the plywood panels, particleboard, and MDF panels groups with polyester-based powder coating.Öğe Laminated veneer lumber from Rowan (Sorbus aucuparia Lipsky)(Academic Journals, 2009) Kol, Hamiyet Şahin; Keskin, Hakan; Korkut, Süleyman; Akbulut, TurgayThis study was designed to determine some physical and mechanical properties and surface roughness of laminated veneer lumber (LVL) made from Sorbus aucuparia Lipsky wood which has no detailed research in the literature. The sample trees were taken from the Kure district in Kastamonu, Turkey. The 12 ply LVLs manufactured from 1.6 mm thick rotary peeled veneers and bonded with urea formaldehyde adhesive. Conventional methods followed and the test procedures were performed on small clean specimens. Also, this study involves the comparison of the mechanical properties of LVL made from S. aucuparia Lipsky wood to those of conventional LVLs. It was found that air-dry density, thickness swelling, thermal conductivity, MOR and MOE, compression strength, surface hardness, shear strength and surface roughness (Ra) were 0.737 g/cm(3), 3.63%, 0.2259 W/m-K, 80.6 N/mm(2), 6985.6 N/mm(2), 58.36 N/mm(2), 29.15 N/mm(2), 5.28 N/mm(2) and 5.13 mu m respectively. When S. aucuparia L. wood is used to produce LVL for use in the furniture industry, the resulting physical and mechanical property values are sufficient to produce an acceptable product. Also, it appears to be a suitable alternative to currently used alnus spp. and fagus spp. according to usage area.Öğe WETTABILITY AND SURFACE ROUGHNESS CHARACTERISTICS OF MEDIUM DENSITY FIBERBOARD PANELS FROM RHODODENDRON (RHODODENDRON PONTICUM) BIOMASS(Univ Bio-Bio, 2012) Akgül, Mehmet; Korkut, Süleyman; Çamlıbel, Osman; Candan, Zeki; Akbulut, TurgayWettability and surface roughness properties of medium density fiberboard (MDF) panels made from Rhododendron biomass were examined in this study. Rhododendron dominates the understory layer of the forests throughout the Black Sea Region in Turkey with substantial biomass potential. This study was conducted to evaluate suitability of Rhododendron fiber for MDF production. For the experiments, rhododendron and commercially-manufactured-chip (Pinus sylvestris L. and Quercus robur L.) with 11% moisture content were used. The mixing ratios of rhododendron with commercially-manufactured-chip were 100:0, 75:25, 50:50, 25:75 and 0:100 %, respectively. Commercial urea formaldehyde (UF) adhesive was used as a binder. A stylus method was employed to evaluate the surface characteristics of the samples. Roughness measurements by the stylus method were taken perpendicularly to the fiber. There was a significant difference (p=0.05) between surface roughness parameters (R-a, R-z, R-q, and R-y). The results obtained in this study revealed that all the panels have met the general purpose-use requirements of European Norm (EN). It was found that panels made with a 25/75 ratio of rhododendron to commercially-manufactured-chip had a significantly lower contact angle (88.14 degrees) than panels made with a 100/0 ratio (117.91 degrees). Surface roughness measurements are based on four roughness parameters, average roughness (R-a), mean peak-to-valley height (R-z), root mean square roughness (R-q), and maximum peak-to-valley height (R-y) were considered to evaluate the surface characteristics of the panels and supported the above findings as the panels made with a 25/75 ratio had a slightly rougher surface with average values of 2.929 mu m (R-a). From the tests performed, we conclude that increasing the rhododendron mixing portion increased surface roughness and decreased wettability. Based on these results, rhododendron biomass could be an alternative raw material for MDF manufacturing.Öğe WETTABILITY AND SURFACE ROUGHNESS OF NATURAL AND PLANTATION-GROWN NARROW-LEAVED ASH (Fraxinus angustifolia Vahl.) WOOD(North Carolina State Univ Dept Wood & Paper Sci, 2011) Büyüksarı, Ümit; Akbulut, Turgay; Güler, Cengiz; As, NusretPlantation-grown wood species are becoming more important. Their anatomical, physical, and mechanical properties are different and generally more variable than wood grown in natural stands. The objective of this study was to investigate the wettability and surface roughness (SR) of natural and plantation-grown narrow-leaved ash (Fraxinus angustifolia Vahl.) wood. The logs were cut from a natural stand versus three different spacings of plantation-grown narrow-leaved ash wood stands. Plantation spacings were 3 x 2 m, 3 x 2.5 m, and 4 x 4 m. The wetting behavior of the wood samples was characterized by the contact angle (CA) method (goniometer technique). A stylus type profilometer was used for the SR measurement according to the DIN 4768 (1990) standard. The SR and CA measurements were done on both the radial and tangential surfaces of the samples. Individual values of both SR and CA of ash wood showed statistically significant differences. Based on the findings, it appears that the natural-grown ash wood have higher (less favorable) SR and lower (more favorable) CA values compared to all the plantation-grown ash wood on both radial and tangential surfaces. Tangential surfaces had lower SR values and higher CA values than the radial surfaces for all groups. In conclusion, plantation-grown narrow-leaved ash wood can be utilized for bonded wood products such as plywood, laminated veneer lumber, and glulam.
