Effects of Pressing Time on Some Technological Properties of Laminated Veneer Lumber (LVL) Produced Using Nylon Waste as Adhesive

Yaşam alanlarındaki kullanımı genişleyen ahşap kompozit malzemelerin, insan sağlığı ve çevre üzerinde olumsuz bir etkisinin olmaması istenmektedir. Ancak odun esaslı kompozit üretiminde kullanılan tutkalların çoğunun formaldehit içeriği nedeniyle, odun kompozit malzemelerinin insan sağlığı ve çevre üzerinde bir tehdit oluşturduğu görülmüştür. Bu nedenle, ahşap esaslı panellerden formaldehit emisyonunu azaltmak için, etkili bir yöntem geliştirme amacıyla çok sayıda çalışma yapılmış ve çeşitli yöntemler denenmiştir. Bu çalışmanın amacı, presleme süresinin naylon kompozit LVL'nin bazı teknolojik özellikleri üzerindeki etkilerini araştırmaktır. Naylon kompozit LVL üretmek için Kavak (Populus deltoides) kaplamaları kullanılmıştır. Naylon kompozit LVL imalatında pres parametreleri olarak üç farklı presleme süresi (8, 10, 12 dakika) ve presleme sıcaklığı 140 °C seçilmiştir. Naylon kompozit LVL panellerin yapışma dayanımı, eğilme dayanımı, elastikiyet modülü, yoğunluk ve denge rutubet miktarı sırasıyla TS EN 314-1, TS EN 310, TS EN 323 ve TS EN 322'ye göre belirlenmiştir. Deneysel sonuçlar panellerin teknolojik özelliklerinin genellikle presleme süresinin azalmasıyla arttığını göstermiştir.

Effects of Pressing Time on Some Technological Properties of Laminated Veneer Lumber (LVL) Produced Using Nylon Waste as Adhesive

It is desired the wood composite materials which have broaden using areas in human residence have no negative effects on human health and environment. But because of formaldehyde content of most of resins used in wood based composite production, wood composite materials have been seen a threat on human health and environment. Therefore, numerous studies have been made to develop an effective method to decrease formaldehyde emission from the wood based panels and various methods have been tried. The aim of the study was to investigate those effects of pressing time on some technological properties of nylon composite LVL. Poplar (Populus deltoides) veneers were used to produce nylon composite LVL. Three different pressing time (8, 10, 12 minutes) and pressing temperature 140 °C were chosen as press parameters in the manufacturing of nylon composite LVL. Bonding strength, bending strength, modulus of elasticity, density and equilibrium moisture content of nylon composite LVL panels were determined according to TS EN 314-1, TS EN 310, TS EN 323 and TS EN 322, respectively. The experimental results showed that technological properties of panels generally increased with decreasing pressing time.

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