Isıl işlemin sarıçam diri odunu ve öz odununun makroskobik ve fiziksel özellikleri üzerindeki etkileri

Yıl 2018, Cilt: 68 Sayı: 2, 93 - 100, 20.07.2018

Fatma Diğdem Tuncer Ayşe Dilek Doğu

Öz

DOI: 10.26650/forestist.2018.343295

Isıl işlemin (ThermoWood) sarıçam diri
odunu ve öz odununun makro yapısı ve fiziksel özellikleri üzerindeki etkileri
görsel olarak ve ilgili standartlar (ASTM D2244, TS 2472) aracılığıyla
incelenmiştir. Thermo-S için 190 ̊ C ve Thermo-D için 212 ̊ C olmak üzere iki
farklı işlem kullanılmıştır. Isıl işlemin etkilerini karşılaştırmak amacıyla
fırın kurusu örnekleri referans alınmıştır. Makroskobik incelemeler sonucunda
tüm örneklerde yüzeysel çatlakların oluştuğu ve sıcaklık arttıkça çatlakların
sayısının ve şiddetinin arttığı görülmüştür. Sadece Thermo-D uygulanmış öz odun
örneklerinde iç çatlak oluşumu ve oluklaşma tespit edilmiştir. Fiziksel
incelemeler göstermektedir ki sıcaklık arttıkça örneklerin rengi koyulaşmakta,
yoğunluk değerleri düşmekte ve boyutsal stabilizasyon iyileşmektedir. Anti
Genişleme Etkisi sırasıyla Thermo-S ve Thermo-D diri odun örnekleri için %17,04
ve %24,77, öz odun örnekleri için %11,97 ve %30,45 olarak belirlenmiştir. Hava
kurusu yoğunluk değerlerindeki en yüksek azalma oranı Thermo-D uygulanmış öz
odun örneklerinde %14,04 olarak tespit edilmiştir. Sıcaklığın artması sonucu
oluşan bu azalma eğiliminin çatlak oluşumu ile ilişkili olduğu düşünülmektedir.

Anahtar Kelimeler

ThermoWood, makro yapı, fiziksel özellikler, sarıçam, çatlak oluşumu

Effects of heat treatment on some macroscopic and physical properties of Scots pine sapwood and heartwood

Öz

DOI: 10.26650/forestist.2018.343295

Impact of heat treatment (ThermoWood) on
the macro structure and physical properties of Scots pine sapwood and heartwood
were studied by visual examinations, using the following relevant standard test
methods: ASTM D2244 and TS 2472, respectively. In the study, two
processes-Thermo-S (190 ̊ C) and Thermo-D (212 ̊ C)-were employed for heat
treatment. To compare the effect of different types of heat treatment, kiln
dried wood samples were used for reference. Macroscopic investigation showed
that superficial cracks occurred in all samples, and as the temperature
increased, the severity and number of cracks increased. In the Thermo-D
process, internal cracks and cupping were seen only in heartwood samples.
Physical examination showed that as the temperature increased, color of the
samples darkened, the density of the samples decreased, dimensional stability
was enhanced. The Anti Swelling-Efficiency (ASE) in the Thermo-S and Thermo-D
processes evaluated in sapwood samples was 17.04% and 24.77%, respectively; however,
values in the heartwood samples were 11.97% and 30.45%, respectively. The
highest reduction ratio of air dried density was 14.04% in the Thermo-D process
applied to the heartwood samples. Thus, it can be concluded that this reduction
due to the increased temperature is related to the formation of internal
cracks.

Anahtar Kelimeler

ThermoWood, macro structure, physical properties, scots pine, crack formation

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