The Effects of Polystyrene Species and Fiber Direction on Thermal Conductivity of Plywood

Year 2020, Volume: 5 Issue: 5, 825 - 828, 31.12.2020

Abdullah Uğur Birinci , Hasan Öztürk , Duygu Yücesoy , Cenk Demirkır

https://doi.org/10.35229/jaes.834382

Abstract

Thermal conductivity of wood material is superior to other building materials because of its porous structure. Thermal conductivity is used to estimate the ability of insulation of material. Thermal conductivity of wood material has varied according to wood species, direction of wood fiber, specific gravity, moisture content, resin type, and addictive members used in manufacture of wood composite panels. The aim of study was to determine the effect of polystyrene species and fiber direction on thermal conductivity of plywood panels. In the study, two different wood types (black pine and spruce), two different fiber directions (parallel and perpendicular to the plywood fiber direction), two different types of insulator (expanded polystyrene-EPS and extruded polystyrene-XPS) and phenol formaldehyde glue were used as the adhesive type. Thermal conductivity of panels was determined according to ASTM C 518 & ISO 8301. As a result of the study, the lowest thermal conductivity values were obtained in the perpendicular fiber direction of the spruce plywood using XPS as insulation material. The use of XPS as an insulation material in plywood has given lower thermal conductivity values than EPS.

Keywords

Thermal conductivity, Polystyrene, Fiber direction, Black pine, Spruce

Polistiren Türü ve Lif Yönünün Kontrplakların Isıl İletkenliği Üzerine Etkisi

Abstract

Ahşap malzemenin ısı iletkenliği gözenekli yapısı nedeniyle diğer yapı malzemelerinden üstündür. Isı iletkenliği, malzemenin yalıtım kabiliyetini tahmin etmek için kullanılır. Ahşap malzemenin ısıl iletkenliği, ağaç türü, ağaç lifinin yönü, özgül ağırlığı, nem içeriği, reçine türü ve ahşap kompozit panellerin imalatında kullanılan katkı maddelerine göre değişmektedir. Bu çalışmanın amacı, polistiren türlerinin ve lif yönünün kontrplak panellerin ısıl iletkenliği üzerindeki etkisini belirlemektir. Çalışmada, iki farklı ağaç türü (karaçam ve ladin), iki farklı lif yönü (kontrplak lif yönüne paralel ve dik), iki farklı tipte yalıtkan (genleştirilmiş polistiren-EPS ve ekstrüde polistiren-XPS) ve tutkal türü olarak fenol formaldehit tutkalı kullanılmıştır. Panellerin ısıl iletkenliği ASTM C 518 ve ISO 8301'e göre belirlenmiştir. Çalışma sonucunda, en düşük ısıl iletkenlik değerleri liflere dik yöndeki ladin kontrplaklarda izolasyon malzemesi olarak XPS kullanılması durumunda elde edilmiştir. Kontrplaklarda izolasyon malzemesi olarak XPS kullanılması durumunda EPS ye göre daha düşük ısıl iletkenlik değerleri elde edilmiştir.

Keywords

Isıl iletkenlik, Polistiren, Lif yönü, Karaçam, Doğu Ladin

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