The effect of sunlight on the wood properties in indoor applications

Öz

Wood, as a natural building material, can be used in many places such as exterior facades, pathways, camellias and house construction. It is also preferred indoors due to its aesthetic appearance. Surface appearance and color stabilization are very important in indoor applications, especially for furniture. Similar to outdoor conditions, wood products tend to yellowing and darkening over time as a result of photo-oxidation of lignin in indoor conditions. It is a common practice to subject the wood to artificial weathering test in a variable cycle of UV, water and temperature in laboratory conditions to determine the resistance of wood against solar irradiance degradations. However, more realistic and objective results can be obtained by exposure to natural conditions. The wooden materials, which are used near the windows in indoor conditions, can be subjected to color change and surface degradation due to sunlight passing through the glass, and this can be artificially simulated by using UVA-351 nm lamps. In this review study, the effects of the degrading factors of wood in indoor conditions, and its effects on wood properties were investigated. In addition, different artificial and natural weathering test methods were examined, and the modellings between the artificial and natural weathering tests were mentioned in this study.

Anahtar Kelimeler

• UV
• photodegradation
• artificial weathering
• indoor conditions
• color changes

İç ortam kullanım yerlerinde güneş ışınlarının ahşabın özelliklerine etkisi

Öz

Doğal bir mühendislik yapı malzemesi olan ahşap, dış ortam koşullarında dış cephe, yürüyüş yolları, kamelya, ev yapımı gibi pek çok kullanım yerlerinde değerlendirilebilirken, iç mekan kullanımı için de sıklıkla tercih edilen dekoratif bir malzeme olmaktadır. Ahşabın iç mekan malzemesi olarak kullanımında, özellikle mobilyada yüzey görünümü ve renk stabilizasyonu çok önemlidir. Ahşap ürünlerde dış ortam koşullarına benzer şekilde iç ortamda da ligninin foto-oksidasyonu sonucu zamanla sararmalar ve koyulaşmalar görülmektedir. Ahşabın güneş ışınlarına karşı dayanımının belirlenmesi amacıyla laboratuvar koşullarında UV, nem ve sıcaklığın değişken döngülerinde belirli bir sürede yapay yaşlandırma testine tabi tutulması yaygın bir uygulama olarak karşımıza çıkmaktadır. Ahşabın servis ömrünün doğru tespit edilmesi için laboratuvar koşullarındaki testlerin yanı sıra doğal ortam koşullarına maruz bırakılma gerekli görülmektedir. İç ortam koşullarında pencere yakınındaki kullanım yeri olan ahşap malzemeler camdan geçen güneş ışıkları nedeniyle renk değişimi ve yüzey bozunmasına maruz kalabilmekte ve bu bozunma UVA-351 nm’lik lambaların kullanılması ile yapay olarak simüle edilebilmektedir. Bu derleme çalışmasında, ahşap malzemenin iç ortam koşullarında kullanımı sırasında maruz kalabileceği bozundurucu faktörlerin ahşabın özelliklerine etkisi araştırılmıştır. Çalışmada farklı yapay ve doğal iç ortam yaşlandırma test yöntemleri irdelenmiş ayrıca yapay ve doğal yaşlandırma arasında modelleme çalışmalarına da değinilmiştir.

Anahtar Kelimeler

• UV
• fotodegradasyon
• yapay yaşlandırma
• iç ortam koşulları
• renk değişimi

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