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Öğe Ahşap Yapıştırma ve Yapıştırıcılar(IUC University Press, 2024) Kurt, Ramazan; Akbulut, TurgayAhşabın, ahşap esaslı kompozitlerden mobilyaya, endüstriyel yapılardan köprülere, gökdelenlerden uydulara kadar çok farklı alanlarda yapısal ve yapısal olmayan uygulamalarda kullanılması ahşap yapıştırma teknolojisine bağlıdır. Ahşap malzemenin yapıştırılabilmesi, yoğunlaştırılabilmesi ve işlenebilmesi mühendislik ürünü malzeme olmasına önemli katkı sunar. Ahşap malzemenin alternatiflerine göre heterojen, higroskopik ve anizotropik olması yapıştırıcının doğru bir şekilde seçimi ve uygulamasını önemli hale getirmektedir. Her bir uygulamanın kendine özgü şartlarından dolayı yapıştırma performansını etkileyen (ahşap, yapıştırıcı, süreç/işlem ve kullanım) faktörlerin göz önünde bulundurulması başarılı bir proje için şarttır. Bu bölümde; ahşap malzemenin sağlıklı, güvenli ve çevre dostu, farklı koşullara dayanıklı bir şekilde kullanılması ve fonksiyonel ürünlerin üretilmesi için mühendis, mimar ve ahşap malzeme kullanan tüm meslek mensuplarına ahşap yapıştırma ve yapıştırıcılar hakkında temel bilgi verilmesi amaçlanmıştır.Öğe The effect of DMDHEU modification on physical and biological properties of parallel strand lumbers(Elsevier Sci Ltd, 2019) Kurt, Ramazan; Dizman Tomak, EylemIn this study, the effect of dimethylol dihydroxyethyleneurea (DMDHEU) modification with four different concentration levels on several properties of parallel strand lumbers (PSLs) produced from poplar veneer strands with phenol and melamine formaldehyde adhesives was studied: density, moisture content, water absorption, thickness swelling, dimensional stability, wettability and decay resistance against C. puteana and T. versicolor attacks. Accelareted aging test was conducted in order to evaluate any loss in effectiveness in decay resistance and dimensional stability due to possibility of cleavage of adhesive bonds in lumbers in outdoors. The PSLs produced with modified strands presented higher density and dimensional stability related with their weight gain but lower moisture content, thickness swelling and water absorption than the controls. DMDHEU modification of PSLs was found efficacious in suppressing brown and white rot fungi attacks, but the protective effect was low when lumbers were aged. PSLs manufactured from rotary peeled veneer strands modified with 5% weight gain of DMDHEU and phenol formaldehyde adhesive showed the most promising results for the investigated properties. (C) 2018 Elsevier Ltd. All rights reserved.Öğe EFFECTS OF PRESS PRESSURES ON GLUE LINE THICKNESS AND PROPERTIES OF LAMINATED VENEER LUMBER GLUED WITH PHENOL FORMALDEHYDE ADHESIVE(North Carolina State Univ Dept Wood & Paper Sci, 2012) Kurt, Ramazan; Cil, MuhammetThe effects of press pressure on glue line thickness (GLT) and properties of laminated veneer lumbers (LVLs) manufactured from half-round sliced I-214 hybrid poplar clone veneers with phenol formaldehyde adhesives were determined. The results showed that press pressures significantly influenced GLT and properties of LVLs. Results of higher specific gravity, thickness swelling ratio, and mechanical properties, but lower GLT and water absorption ratio were attributed to higher press pressure uses. Optimum properties were obtained by using a press pressure of 10 kg cm(-2) in relation to GLT and properties of LVLs. Significant relationships were found between GLT and mechanical properties. GLT may provide reliable information to determine wood bonding quality and may be used for non-destructive evaluation of mechanical properties of wood composites in the future.Öğe Influence of Press Pressure on the Properties of Parallel Strand Lumber Glued with Urea Formaldehyde Adhesive(North Carolina State Univ Dept Wood & Paper Sci, 2013) Kurt, Ramazan; Aslan, Kagan; Cavus, VedatThe effects of press pressure on laboratory-made parallel strand lumbers (PSLs) that were manufactured from fast-growing rotary-peeled I-77/51 (Populus deltoides) hybrid poplar clones' veneer strands with a urea formaldehyde (UF) adhesive using press pressures ranging from 7.5 to 15 kg cm(-2) in increments of 2.5 kg cm(-2) were investigated. The physical and mechanical properties of PSL were affected by the press pressures. However, press pressures did not affect the combustion properties. Results indicated that higher press pressures lead to higher densification or compaction rates and specific gravities (SGs). For improved physical and mechanical properties, higher press pressures were found to be necessary. A press pressure of 12.5 kg cm(-2) was found to be the optimum press pressure in relation to PSL properties. There are positive correlations among SG and mechanical properties as well as press pressures. The results may provide valuable information to assess the behavior of structural composite lumbers, including PSLs, that are manufactured using low and high press pressures. Utilization of fast-growing tree species is possible because their strength properties are improved through pressing.