Journal of Green Technology and Environment

Ebony Macassar (Diospyros celebica Bakh.) Odununda Balmumu Uygulaması Üzerine Bir Çalışma

2024-02-27T19:29:53+03:00

Bu çalışmada, Ebony Macassar (Diospyros celebica Bakh.) odununda balmumu uygulamasının yapılması sonrasındaki renk, beyazlık indeksi (WI*) (lifler dik ve paralel yönlerde) ve parlaklık özellikleri (lifler dik ve paralel yönlerde ve 20, 60 ve 85 derecelerde) belirlenmiştir. Bir kontrol grubu oluşturularak kat uygulamasına sahip örneklerle sonuçlar kıyaslanmıştır. Bütün kat uygulamaları ile L*, b* ve C* değerlerinde azalışlar belirlenmiştir. 60 ve 85 derecelerde en düşük sonuçlar balmumu uygulanmamış örneklerde bulunmuştur. Buna ek olarak, balmumu uygulamaları ile artışlar elde edilmiştir. WI* değerleri her iki yönde de elde edilen sonuçlar balmumu uygulamasına ait kat sayısının artmasıyla azalmıştır. ∆E* değerleri 1 kat uygulama ile 5.86, 2 kat uygulama ile 9.01 ve 3 kat uygulama ile 9.22 olarak hesaplanmıştır. ∆E* değerleri 2 ve 3 kat balmumu uygulamaları ile birbirine çok yakın sonuçlar vermiştir. Sonuç olarak; 3 kat uygulamaya gerek duyulmadığı söylene bilinir.

Al and Fe Changes in Cedrus atlantica Depending on Organ, Age Range, and Direction

2024-04-10T18:34:36+03:00

Among the environmental pollution components that are among the most critical troubles of the present day, air contamination and, specifically, heavy metal (HM) contamination, whose release rises with industrial doings, are of great significance. One of the most effective methods for screening the differences in HM concentrations in the atmosphere over time is using annual rings of trees as biomonitors. This study tried to determine the changes in the concentrations of Fe and Al, the most common heavy metals, in the annual rings of the Cedrus atlantica tree, which was cut down at the end of 2019 in Kastamonu province, depending on the plant organ, age-range, and direction. According to the study results, the concentration of Fe element in the plant is not caused by traffic, while the concentration of Al increases due to traffic and enters the plant from the air. Study results show that both elements can be transferred in Cedrus atlantica wood.

Effect of Nano Material Ratio on Some Surface Properties of Wood Polymer Nanocomposites

2024-04-19T19:46:54+03:00

Organic materials such as agricultural wastes and forest industry wastes can be successfully used as organic fillers in polymer composite production. Wood polymer composites are generally defined as a group of materials formed by combining two or more materials in a polymer matrix. As a result of their studies to improve the performance level, researchers have determined that this situation can be eliminated by using nano materials as reinforcing reinforcement material in wood plastic composite structure. The aim of this study is to determine some surface properties of wood plastic nanocomposites reinforced with nano-sized SiO₂. Four wood polymer nanocomposites containing nano SiO₂ at four different ratios were produced for the purpose. Surface roughness and hardness values of the wood polymer composites were determined. It was determined that the surface roughness values of wood polymer nanocomposite groups decreased as the SiO₂ nano material ratio increased. On the other hand, when the data on pencil hardness values were analyzed, it was determined that the pencil hardness values of wood polymer nanocomposite groups increased as the SiO₂ nanomaterial ratio increased.

Amazon Rosewood (Dalbergia spruceana Benth.) Ahşabında Ağartma Uygulamaları

2024-05-01T21:08:47+03:00

Bu çalışmada, Amazon Rosewood (Dalbergia spruceana Benth.) ahşabında ağartma [kimyasallar: oksalik asit (C₂H₂O₄) ve hidrojen peroksit (H₂O₂) + sodyum hidroksit (NaOH)] uygulamaları yapıldıktan sonra meydana gelen bazı yüzey değişimleri [renk parametreleri, beyazlık indeksi: (WI*) ve parlaklık değerleri] incelenmiştir. Ağartma işlem görmüş yüzeyler ile görmemiş (kontrol) yüzeyler birbirleri ile kıyaslanmıştır. Elde edilen sonuçlara göre, liflere dik yönde 20 derecede yapılan ölçümler dışında bütün testler üzerinde kimyasal türü için varyans analizlerinde anlamlı sonuçlar tespit edilmiştir. b*, C*, h^o ve WI*║ değerlerinde her iki kimyasalların ahşap malzeme yüzeylerine muamele edilmesi sonrasında artışlar görülmüştür. C₂H₂O₄ kimyasalı ile L* değerinde azalmalar ve a* değerinde ise artışlar belirlenirken, H₂O₂ + NaOH ile bu iki parametrede zıt bir durum elde edilmiştir. Her iki yönde yapılan 60 ve 85 derecelerdeki parlaklık değerlerinde de azalışlar belirlenmiştir.

Determination of Physical and Mechanical Properties of Veneered OSB

2024-05-02T13:23:31+03:00

The aim of this study is to investigate the physical and mechanical properties of OSB boards whose surfaces are covered with wood veneer. In the study, veneered OSB boards were produced with a final thickness of 18 mm using poplar and beech veneers. Phenol formaldehyde and urea formaldehyde glues were used as glue. Air dry, oven dry and wet densities of the veneered OSB boards produced were determined. On the other hand, 2, 24 and 72 hours water absorption and thickness swelling properties were determined. Bending strength and mod-ulus of elasticity testing of the veneered OSBs produced was carried out. The water absorption and thickness swelling resistance of veneered OSB boards produced using PF glue gave better results than those produced using UF glue. It has been determined that gluing the veneers with the fiber directions perpendicular or parallel to each other has no effect on the density. It has been understood that veneered OSBs produced using beech veneers generally exhibit better mechanical properties than veneered OSBs produced using poplar veneers. It can be said that covering the surfaces of OSBs with veneers affects the thermal conductivity value negatively and other physical and mechanical values positively. In order to increase the usage areas of veneered OSBs, it is recommended to conduct new studies using different wood species and glues.