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Öğe The color changes on varnish layers after accelerated aging through the hot and cold-check test(2010) Budakçi, M.; Korkut, D.S.; Esen, R.The purpose of this paper is to determine the color changes of cellulosic, polyurethane and acrylic varnish layers which were applied on the surfaces of Scots pine (Pinus sylvestris L.), Eastern beech (Fagus orientalis L.) and sessile oak (Quercus petraea L.) wood material after accelerated aging effects through the hot and cold-check test. For this purpose, test samples were firstly kept at 50 ± 5°C temperature for 1 h, and then conditioned for 1 h in a conditioning room, later moved to -20 ± 2°C temperature keeping for 1 h according to ASTM D1211-97 standard. These processes were accepted as 1 cycle and tests were continued to 20 cycles. Then the color changes were determined by using Minolta CR-231 device of tristimulus colorimeter according to ASTM D2244-07e1 standard. It was found that most color change was determined in cellulosic, polyurethane and acrylic varnish layers on the surfaces of Scots pine (Pinus sylvestris L.), Eastern beech (F. orientalis L.) and sessile oak (Q. petraea L.) wood material. The endurance of the protective coating (such as paint and varnish) to external effects is limited and the lifetime of the coating is determined by the type and the severity of the effects to which it is exposed. The effect of a color change on varnish layers can determine the usefulness of the varnish. It is conjectured that especially for the manufacturers and consumers in the furniture and decoration sector, the data obtained in this study will contribute to the making up of deficiencies in the understanding of the subject. © 2010 Academic Journals.Öğe Comparision of the multiple regression, ann, and ANFIS models for prediction of MOE value of OSB panels(Statny Drevarsky Vyskumny Ustav, 2016) Yapici, F.; Senyer, N.; Esen, R.This research investigates the prediction of modulus of elasticity (MOE) properties, which is the most important properties in many applications, of the oriented strand board (OSB) produced under different conditions (pressing time, pressing pressure, pressing temperature and adhesive ratios) by multiple regression, artificial neural network (ANN) and adaptive Neurofuzzy inference system (ANFIS). Software computing techniques are now being used instead of statistical methods. It was found that the constructed ANFIS exhibited a higher performance than multiple regression and ANN for predicting MOE.Software computing techniques are very useful for precision industrial applications and, also determining which method gives the highest accurate result.Öğe Compression strength perpendicular to grain characteristics of impregnated laminated veneer lumbers exposed to sea water(Lietuvos Misku Institutas, 2016) Esen, R.; Kurt, S.; Özcan, C.The purpose of this study is to determine the compression strength perpendicular to grain of laminated veneer lumber exposed to sea water 3, 6, 9 and 12 months and obtained from Scots pine by using different adhesive and impregnating materials. While the highest compression strength perpendicular to grain is obtained from then unimpregnated samples, which are not exposed to sea water, with 39.56 N/mm2 the lowest compression strength perpendicular to grain is obtained from the unimpregnated samples exposed to sea water for 12 months with 10.94 N/mm2. © 2016, Lietuvos Misku Institutas. All rights reserved.Öğe The effect of edge banding thickness of some trees on withdrawal strength of beech dowel pins in composite material(2011) Yapici, F.; Likos, E.; Esen, R.Composite materials and wooden dowels are being used increasingly in the construction of furniture frames and inner decoration. Yet there is little information available concerning the withdrawal strength of various fasteners, and, in particular, dowels in composite materials edged solid wood edge bandings. The aim of this study was to determine the withdrawal strengths of 6, 8, 10 mm diameter dowels produced from beech with respect to edge of a medium-density fiberboard (MDF) or particleboard (PB) edged with 5,10 and 15 mm thickness of solid wood edge banding of scotch pine, oriental beech and lime tree, bonded with hot-melt, poly (vinyl acetate) (PVAc) and Desmodur-VTKA (D-VTKA), a polyurethane based one-component adhesive. The effects of edge banding thickness, dimension of dowels, type of composite materials and type of adhesives used for edge banding on the withdrawal strength were determined. The highest (6.68 N.mm-2) withdrawal strength was obtained in beech dowels with 8 mm diameter for MDF with 5 mm thickness of solid wood edge banding of bonded beech with D-VTKA adhesive.Öğe The effect of grain angle and species on thermal conductivity of some selected wood species(2011) Yapici, F.; Ozcifci, A.; Esen, R.; Kurt, S.In this study the thermal conductivity of different wood materials was determined. For this purpose, Scots pine (Pinus sylvestris L.), Uludag fir (Abies Bornmülleriana Matff), Oriental beech (Fagus orientalis L), Oak (Quercus robur L.), and Chestnut of Anatolia (Castanea sativa Mill.) woods were used. In the test, the thermal conductivity of the woods was measured according to procedure of ASTM C 1113-99 standards. The lowest thermal conductivity was obtained in the perpendicular direction of Scots pine samples as 0.156 Kcal/mh°C. The highest thermal conductivity was obtained from perpendicular direction of samples in Oriental beech as 0.331 Kcal/mh°C.Öğe The effects of cast-polyamide on the modulus of rupture and modulus elasticity of oriented strength board (OSB) Manufactured from Scotch Pine(Faculty of Forestry, Zagreb University, 2013) Yorur, H.; Yapici, F.; Esen, R.This study was carried out to determine the effects of using cast-polyamide on modulus of rupture (MOR) and modulus elasticity (MOE) of oriented strand board (OSB) which were produced in four different conditions. Firstly, control panels were manufactured, and also OSB panels produced by adding cast-polyamide with 20 % - 30 % ratio compare with weight of oven dry wood particle both out layer and inner layer. Phenol formaldehyde was used at 6 % ratio. Strands were used to the production of panels made up 50 % of core layer and 50 % of outer layers. Test panels were pressed in 6 min., 40 kg/cm2 press pressure and 185±3°C press temperature by aiming for a target density of 0.67 g/cm3. The values of modulus of rupture and modulus elasticity were determined by using according to related standard.Öğe The effects of press time and press pressure on modulus of rupture and modulus of elasticity properties of oriented strength board (OSB) manufactured from poplar wood(Faculty of Forestry, Zagreb University, 2013) Yapici, F.; Esen, R.This study was carried out to determine the effects of pres time and pres pressure on modulus of rupture (MOR) and modulus of elasticity (MOE) properties of oriented strand board (OSB). For this purpose, 80 mm long strands made of poplar wood bonded with phenol-formaldehyde resin at (9 %) with three-layer cross-aligned OSBs. The strands used for the production of test panels were made up 50 % of core layer and 50 % of outer layers. The panels were pressed for three different press times, from 3, 6 to 9 minutes, using 30, 40 and 50 kg/cm2 bar pressure respectively, aimed for density of 0.65 g/cm3.Öğe The effects of press time and press pressure on the screw strength properties of oriented strength board (OSB) manufactured from poplar wood(Faculty of Forestry, Zagreb University, 2013) Esen, R.; Yapici, F.The effects of press time and press pressure on the screw strength properties of oriented strength board was investigated. For this purpose, 80mm long strands made of Poplar were bonded with phenol-formaldehyde resin at (9 %) with three-layer cross-aligned OSBs. The strands used for the production of test panels were made up 50 % of core layer and 50 % of outer layers. The panels were pressed for three different press times (3, 6 to 9 minutes), under 30, 40, and 50 kg/cm2 bar pressure, aiming for a target density of 0.67 g/cm3. It was observed that the screw strength values were changed between 637-945 N.Öğe Impacts of impregnation chemicals on finishing process and combustion properties of oriental beech (fagus orientalis l.) Wood(2011) Yapici, F.; Uysal, B.; Kurt, S.; Esen, R.; Özcan, C.Effects of the impregnation materials borax, boric acid, and Tanalith-E on combustion properties of Oriental beech (Fagus orientalis Lipsky) were investigated. The immersion method was used for long-term impregnation (24 h). After the impregnation process, polyurethane as well as synthetic, acid hardening, and water-based varnishes were applied on the wood sample surfaces according to company's suggests. The combustion test was performed according to the ASTM-E 69 standard. The mass reduction, release of gasses (CO, NO, O 2), and the temperature differences of samples were determined for each 30 seconds during combustion. It was shown that the most mass reduction occurred when both polyurethane varnish and boric acid were applied.Öğe Variable Climate's Effect on Wood Material's Equilibrium Moisture Content in Turkey(North Carolina State University, 2020) Esen, R.; Türüdü, C.Some negative attributes of wood material have numerous practical consequences. The most important of these attributes is that wood, as a hygroscopic material, is dependent on the relative humidity of its environment. The hygroscopic nature of wood material can lead to serious problems when used in doors, windows, and interior or exterior decoration materials. The aim of this study was to evaluate the effect on wood materials equilibrium moisture due to different climates in selected provinces in Turkey. This study examined pine (Pinus sylvestris L.) and oak (Quercus rubra L.) woods, both of which are commonly used in industry. Over 12 months, the equilibrium moisture value of these wood was determined in the Bursa, Antalya, İzmir, Malatya, Trabzon, Karabük, Van, and Kars provinces of Turkey. Pine and oak samples, prepared per standards TS 2471 (1976) and TS 2472 (1976), were taken from these provinces each month, and the equilibrium moisture values were determined. It was observed that the use of Scotch pine wood samples for both indoor and outdoor use was more appropriate over the 12-month period. Malatya was the province in which the Scotch pine samples were the least affected. It was also determined that Van was the most suitable province for the interior use of oak wood material. It was not found that indoor use gave better results than outdoor use. © 2020. All Rights Reserved.
