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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 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 Glossiness, color stability, and surface roughness of wood treated with some bleaching chemicals(2009) Ozcifci, A.; Yapici, F.; Altun, S.; Toker, H.; Baysal, E.; Senel, A.; Simsek, H.The aim of this study was to determine the effects of different bleaching chemicals and their treatment time on glossiness, color stability, and surface roughness of wood. Spruce (Picea orientalis L.) and oak (Quercus sessiliflora Salisb.) wood specimens were bleached with aqueous solutions of 25% hydrogen peroxide (H2O2), 25% ammonia (NH3), and their mixture (1:1;volume:volume) for 10, 20, and 30 minutes immersing. Glossiness of wood specimens parallel and perpendicular to grain values were measured with Glossmeter at 60-degree incident angle. Color measurements and surface roughness were wade according to ISO 7724 - 2, and ISO 4287 standards, respectively. Results showed that the highest glossiness decrease (0.99) was observed in oak wood treated with ammonia solution perpendicular to grain for 20 min. immersing. The highest total color chance (18.88) was observed in oak wood treated with ammonia solution for 30 minutes immersing. All bleaching solutions increased the surface roughness of wood specimens.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 An investigation on compression parallel to grain values of wood impregnated with some boron compounds(2008) Toker, H.; Baysal, E.; Ozcifci, A.; Altinok, M.; Sonmez, A.; Yapici, F.; Altun, S.This study was carried out to determine compression strength parallel to grain of wood impregnated with some boron compounds. Sodium perborate (SP) boric acid, (BA), and borax (BX) were used as boron compounds. Wood specimens were prepared from Calabrian pine (Pinus brutia Ten.) and beech (Fagus orientalis L.) wood. Before compression test parallel to grain, wood specimens were impregnated with aqueous solutions (1, 2, 3, 4, 5, and 6 %) of boron compounds according to ASTM D 1413(1976). Results showed that compression strength parallel to grain values ofwood specimens treated with boron compounds were lower compared to untreated control specimens. Borate treatments reduced compression strength parallel to grain of wood in significant level compared to untreated control. The compression strength parallel to grain values ofwood specimens were the highest for untreated control specimen followed by BA, BX, and SP treated wood specimens, respectively. In general, our results showed that the higher concentration levels of boron compounds, the lower compression strength parallel to grain values of wood resulted.Öğe Prediction of modulus of rupture and modulus of elasticity of heat treated anatolian chestnut (Castanea sativa) wood by fuzzy logic classifier(Journal Drvna Industrija, 2012) Yapici, F.; Ulucan, D.In this study, test samples prepared from Anatolian chestnut (Castanea sativa) wood were first exposed to heat treatment at 130, 145, 160, 175, 190 and 205 °C for 3, 6, 9 and 12 hours. Then the values of the samples of the modulus of rupture (MOR) and modulus of elasticity (MOE) were determined and evaluated by multiple variance analysis. The aim of this study was to establish the effects of heat treatment on the MOR and MOE values of wood samples by using fuzzy logic classifier. Secondly, input and output values and rule base of the fuzzy logic classifier model were built by using the results obtained from the experiment. The developed fuzzy classifier model could predict the MOR and MOE values of test samples at the accuracy levels of 92.64% and 90.35%, respectively. The model could be especially employed in manufacturing stages of timber industry.Öğe Some combustion parameters of wood impregnated with borates(2009) Toker, H.; Baysal, E.; Ozcifci, A.; Simsek, H.; Altun, S.; Yapici, F.; Goktas, O.This study was conducted to determine some of the combustion parameters of Calabrian pine and Oriental beech treated with borates. Average mass loss and temperature values of Calabrian pine and Oriental beech wood were determined according to ASTM E-69. Boric acid, borax, and sodium perborate were used as borates. Before the combustion test, wood specimens were impregnated with aqueous solutions (1%, 2%, 3%, 4%, 5%, and 6%) of borates according to ASTM D1413-76. These results showed that mass loss and temperature values of both wood specimens treated with borates were lower compared to the untreated control specimens. Higher concentration levels of borates resulted in lower mass loss and temperature values of the wood. ©Forest Products Society 2009.
