Ayata, Ümit; Peker, Hüseyin; Ulay, Göksel; Çamlıbel, Osman; Atilgan, Abdi

It is known that blue stain causes a loss of price value for Scots pine wood in the wood trade due to the visual defects it creates. In this study, color parameters [red color tone (a*), lightness (L*) value, yellow (b*) color tone, tone angle (h°) value, and chroma (C*) value], whiteness index (WI*) values, and glossiness measurements [at angles of 20°, 60°, and 85°] were compared in Scots pine (Pinus sylvestris L.) wood with normal and blue rot conditions. According to the color parameters obtained, it was determined that the L* value decreased by 11.43%, a* by 79.95%, b* by 28.86%, and C* by 32.75%, while the h° value increased by 17.74%. With the blue coloration, decreases were observed in the 20° glossiness values measured in the ⃦ and ⊥ directions, while increases were observed in the 60° and 85° glossiness values measured in the ⃦ and ⊥ directions. With the blue coloration, decreases of 12.86% in the ⊥ direction and 29.87% in the ⃦ direction in the WI* values were observed. According to these results, it was determined that the wood material with the blue coloration disease had a darker color.

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Çamlıbel, Osman; Ayata, Ümit

High-density fiberboard (HDF) has been utilized in various forest-based industries for centuries. This study investigated the effects of different adhesive ratios on the properties of HDF through a series of tests. The panels, designed in particular for this study, had been produced in a laboratory putting the usage of a combination of 70% fir (Abies nordmanniana subsp. bornmulleriana) and 30% beech (Fagus orientalis L.) fibers sourced from the western Black Sea area of Turkey. Two adhesive levels were tested: 10.73% for panel I and 11.30% for panel II, both calculated based on dry fiber weight. We assessed several physical and mechanical properties, including density, modulus of rupture (MOR), modulus of elasticity (MOE), internal bonding (IB), hardness, water absorption, and through-thickness swell, in accordance with standard testing methods. The results indicated that both adhesive levels produced panels meeting the general performance requirements for HDF. Panel II, which contained slightly more adhesive, demonstrated marginally better performance in specific strength and dimensional stability tests. Overall, the findings suggest that optimizing adhesive usage in industrial HDF production can help establish a balance between the performance requirements of the boards and cost-effectiveness in production.

İncele

Çamlıbel, Osman; Ayata, Ümit

Yabancı tür ağaçlarından birisi olan monkey pod (Pithecellobium saman (Jacq.) Benth.), sert ve ağır bir yapıya sahip olup, ahşabı döşeme, kalıp yapımı, tornalama, dolap yapımı, mobilya, yer döşemesi, panel ve cephe kaplaması olarak kullanılmaktadır. Bu çalışmada, monkey pod odununda farklı numaralara (80, 100, 120, 150, 180 ve 220) sahip zımparaların kullanılması ile elde edilen yüzeyler üzerinde yüzey pürüzlülüğü parametreleri ve shore - D sertlik değeri belirlenmiştir. Elde edilen testlere ait sonuçlar bazı ağaç türleri ile kıyaslanmıştır. Araştırma sonuçlara göre, monkey pod odununda shore - D sertlik değeri 71.70 olarak belirlenmiştir. Buna ek olarak, zımparalama işlemlerinden sonra zımpara numarasının artması ile yüzey pürüzlülüğü parametrelerine (Ra, Rz ve Rq) ait sonuçların azaldığı belirlenmiştir. Zımparalama işleminden sonra, Ra parametresi 80 no’lu zımpara için 6.462 µm, 100 no’lu zımpara için 5.473 µm, 120 no’lu zımpara için 4.521 µm, 150 no’lu zımpara için 3.761 µm, 180 no’lu zımpara için 2.681 µm ve 220 no’lu zımpara için 1.883 µm olarak elde edilmiştir.

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