Selahattin Bardak

The Influences of Drying Temperature of Wood Particles on the Quality Properties of Particleboard Composite

The objective of this investigation was to evaluate the effects of drying temperature of wood particles on the quality properties of particleboard composite and chemical properties of wood. Test panels were manufactured using wood particles dried at different temperatures ranging from 100 to 180°C. Based on the findings obtained in this study, increasing drying temperature of the particles negatively affected the mechanical properties, surface roughness, and wettability of the particleboards. However, increasing drying temperature significantly caused a positive effect on the thickness swelling. The results showed that the particleboards made from particles dried at 180°C did not meet the required levels of mechanical strength properties according to the EN 312 (2010) standard for furniture production. The particleboards made from wood particles dried at 150°C for 35 min appeared to be a practical choice for interior fitments.

The role of solid content of adhesive and panel density on the dimensional stability and mechanical properties of particleboard

The aim of this study was to investigate the role of the panel density and solid content of adhesive on the physical (thickness swelling) and mechanical properties (modulus of rupture, modulus of elasticity, and internal bonding strength) of particleboard composite. For the changing panel density, two different target densities (0.60 and 0.65 g/cm3), three different hot pressing pressures (20, 25, and 30 kg/cm2), two different shelling ratios (35% and 45%), and two different surface coating materials (at 70 and 90 g/m2 grammage) were applied during the manufacturing of test panels. Increasing pressure improved all the properties of particleboard. However, applying lower or higher pressure level than required and necessary level negatively affected the thickness of the panels. Shelling ratio was found to be effective on the mechanical and physical properties of particleboard. Increasing panel density improved the strength properties and thickness swelling after 2 h immersion. However, high panel density negatively affected the thickness swelling after 24 h immersion. Coating of particleboard surfaces caused superior mechanical, except for internal bond strength, and physical properties. Melamine-impregnated paper grammage significantly improved the modulus of rupture, modulus of elasticity, and thickness swelling. Increasing paper grammage improved these properties. However, internal bond strength was not affected by paper grammage. Decreasing solid content of adhesive in the surface layers significantly improved all the properties of particleboard composite.

Manufacture and Properties of Particleboard Composite From Waste Sanding Dusts

In this study, waste sanding dusts were used for particleboard manufacturing. The purpose of this study was to determine the effects of waste sanding dusts usage and formaldehyde/urea mole ratio of urea formaldehyde adhesive on the physical (thickness swelling) and mechanical (modulus of rupture, modulus of elasticity and internal bond strength) of the particleboard panels. 10 and 15% waste sanding dusts usage improved the physical and mechanical properties. Increasing waste sanding dusts usage amount from IS to 20 and 25% negatively affected all of the properties of particleboard panels. It has been concluded that waste sanding dusts could be used as a raw material. However, waste sanding dust usage amount should not exceed the certain limits related to formaldehyde/urea mole ratio. The formaldehyde/urea mole ratio was found to be effective on the properties of particleboard. Increasing formaldehyde/urea mole ratio significantly improved the physical and mechanical properties of particleboard.

Effects of Formaldehyde/Urea Mole Ratio, Panel Density, Shelling Ratio, and Waste Screen Dust on the Physical and Mechanical Properties, and Formaldehyde Emission of Particleboard Composite

In this study, a detailed account is given of how urea formaldehyde adhesives with different mole ratios, panel density, shelling ratio and waste screen dust addition influence the physical and mechanical properties, and formaldehyde emission of particleboard panels. The experimental results showed that formaldehyde emission decreased with decreasing formaldehyde/urea mole ratio and shelling ratio, and waste screen dust addition. The modulus of rupture, modulus of elasticity and internal bond strength and thickness swelling of the test panels improved with increasing mole ratio, panel density and shelling ratio, and waste screen dust addition. However, increasing panel density negatively affected formaldehyde emission.

Experimental investigation and prediction of bonding strength of Oriental beech (Fagus orientalis Lipsky) bonded with polyvinyl acetate adhesive

Adhesive bond strength of solid wood plays a key role in the efficient use of wood in a large number of engineering applications. In this study, the effects of amount of adhesive, pressing pressure, and pressing time on bonding strength of beech wood bonded with polyvinyl acetate adhesive were investigated and predicted by developing an artificial neural network (ANN) model. Experimental results have showed that bonding strength of wood samples increased generally by increasing amount of adhesive, pressing pressure, and pressing time. Besides, ANN analysis has yielded highly satisfactory results. The designed neural network model allows predicting the bonding strength of wood samples with mean absolute percentage error of 2.454% and correlation coefficient of 97.8% for testing phase. It is clear from the results that the model has a good learning and generalization ability. This model therefore can be used to predict bonding strength of beech samples bonded with polyvinyl acetate adhesive under given conditions. Consequently, this study provides beneficial insights for practitioners in terms of the safe and efficient use of wood as an engineering material in applications related to the strength of the bond between wood and adhesive.

Effects of Density Profile and Hot Press Diagram on the Some Technological Properties of Particleboard Composite

Abstract In this study, the effects of density profile and hot press diagram on the technological properties of particleboard were analyzed. Physical and mechanical properties of particleboards were evaluated. Density profile was found a main parameter affecting quality properties of particleboard. While increasing entrance pressure improved the modulus of rupture and elasticity, and thickness swelling of the panels, increasing exit pressure was found to be effective on the bonding strength and thickness swelling. Exit pressure did not statistically affect the bending properties. Decreasing feeding speed of the hot press significantly improved all of the properties. While high surface density improved the modulus of rupture and elasticity, and thickness swelling, high core density caused better internal bond strength and thickness swelling. Entrance pressure was found to be effective on the surface density of particleboard. Exit pressure did not statistically affect the surface density, however, increased the core density.

POLİVİNİLASETAT TUTKALI İLE YAPIŞTIRILMIŞ DOĞU KAYINI (Fagus orientalis Lipsky) VE DOĞU LADİNİ (Picea orientalis (L.) Link.) ODUNLARININ YAPIŞMA PERFORMANSI ÜZERİNE SUDA BEKLETME FAKTÖRLERİNİN ETKİLERİNİN ARAŞTIRILMASI

Odunun yapistirici bagi odun kaynaklarinin etkili kullaniminda anahtar bir faktordur. Bu nedenle, bir yapistirici ile birlestirilen odun urunlerinin performansinin farkli sartlar altinda degerlendirilmesi oldukca onemlidir. Bu calismada, PVAc ile yapistirilan odun ornekleri farkli sicakliktaki suya (20, 40, 60 ve 80oC) farkli sureler (10, 20, 30 ve 40 dakika) icin maruz birakilmistir. Deneysel sonuclar incelendiginde, PVAc ile yapistirilmis odun orneklerinin suya maruz birakilmasi ile orneklerin yapisma direncinde onemli derecede bir dusus oldugu gozlemlenmistir. Direnc degerlerinde gozlemlenen bu dususler ozellikle 60 °C ve uzerindeki sicakliktaki su ile muamelede daha ciddi oranlara ulasmistir. Ayrica, direnc degerlerindeki dususler maruz birakilan surenin artisi ile genellikle artmistir.

Effect of paraffin application technique on the physical and mechanical properties of particleboard

Abstract The main objective of this study was to investigate the effect of paraffin application technique on the quality properties of particleboard. The paraffin was applied to the wood particles in three different techniques: (1) before resination, (2) after resination, and (3) with resin. The modulus of rupture, modulus of elasticity, internal bond strength, thickness swelling, surface roughness parameters, contact angle, and formaldehyde emission of the boards were determined. Statistical analysis showed that paraffin application technique had a significant influence on all properties of particleboards. The boards made using technique (1) had the highest mechanical properties and lowest surface roughness, formaldehyde emission and contact angle values. The worst properties were obtained from the board made using technique (2).