Effect of heat treatment on color, glossiness and shore D hardness values of eyong, jequtiba and koto wood species

Abstract

Today, there are many different heat treatment methods applied to wood materials. Various properties of wood (physical, mechanical, biological, chemical, color, gloss, surface roughness, wettability, etc.) change with the application of heat treatment. This situation helps to create new usage areas for wood material. Foreign tree species of eyong (Eribroma oblonga), jequitiba (Cariniana legalis (Mart.) Kuntze) and koto (Pterygota macrocarpa K. Schum.) have an important value in the furniture industry abroad. In this research, the color (yellow color tone: b*, red color tone: a* and lightness: L*), glossiness (parallel // to the fibers at 20^o, 60^o and 85^o) and shore D hardness values that occur after the heat treatment applied at 200^oC for 3 hours on the test samples belonging to the eyong, jequitiba, koto wood types were determined. According to the results obtained, variance analysis was obtained significantly for all tests. It was observed that b*, L*, glossiness values and shore D hardness values decreased in all wood species after heat treatment. ∆E* values were obtained as 39.72, 36.70, and 34.36 in eyong, koto and jequitiba woods, respectively.

Keywords

• Eyong
• jequitiba
• koto
• color
• gloss
• shore -D hardness value

Eyong, jequtiba ve koto ağaç türlerinde renk, parlaklık ve shore D sertlik değerleri üzerine ısıl işlemin etkisi

Abstract

Günümüzde ahşap malzemelere uygulanan birçok farklı ısıl işlem metotları bulunmaktadır. Ahşaba ait çeşitli özellikler (fiziksel, mekanik, biyolojik, kimyasal, renk, parlaklık, yüzey pürüzlülüğü, ıslanabilirlik, vb.) ısıl işlem uygulaması ile değişmektedir. Bu durum ahşap malzeme için yeni kullanım alanlarının oluşmasına yardım etmektedir. Eyong (Eribroma oblonga), jequitiba (Cariniana legalis (Mart.) Kuntze) ve koto (Pterygota macrocarpa K. Schum.) yabancı ağaç türleri yurt dışında mobilya sektöründe önemli değere sahip olmaktadır. Bu araştırmada, eyong, jequitiba, koto odun türlerine ait deney örneklerine 200^oC’de 3 saat süre ile uygulanan ısıl işlem sonrası meydana gelen renk (sarı renk tonu: b*, kırmızı renk tonu: a* ve ışıklılık: L*), parlaklık (20^o, 60^o ve 85^o’de liflere paralel //) ve shore D sertlik değerleri belirlenmiştir. Elde edilen sonuçlara göre, varyans analizleri bütün testler için anlamlı olarak elde edilmiştir. Isıl işlemden sonra bütün ağaç türlerinde b*, L*, parlaklık değerleri ve shore D sertlik değerlerinin azaldığı görülmüştür. ∆E* değerleri eyong, koto ve jequitiba odunlarında sırasıyla 39.72, 36.70 ve 34.36 olarak elde edilmiştir. 

Keywords

• Eyong
• jequitiba
• koto
• renk
• parlaklık
• shore -D sertlik değeri

Thanks

Bu çalışmada renk, parlaklık ve shore D sertlik değerlerinin ölçülmesine ait cihazların temin edilmesinde Doç. Dr. Ümit AYATA’ya teşekkürlerimi sunarım.

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