Orman Endüstri Mühendisliği Bölümü Makale KoleksiyonuOrman Endüstri Mühendisliği Bölümü'ne ait makale çalışmalarını içerirhttp://hdl.handle.net/11772/7982024-03-29T01:37:19Z2024-03-29T01:37:19ZThe effect of using alum mordant in wild cherry bark dyestuff for the production of UV resistant colored paperGençer, AyhanCan, AhmetGitti, Ülkü BurcuMustak, Aysunhttp://hdl.handle.net/11772/27022020-02-27T00:00:25Z2019-12-15T00:00:00ZThe effect of using alum mordant in wild cherry bark dyestuff for the production of UV resistant colored paper
Gençer, Ayhan; Can, Ahmet; Gitti, Ülkü Burcu; Mustak, Aysun
Depending on the use of wood in the forest industry, wood bark is mostly peeled and used as fuel.
The ash and smoke left from the burned bark causes environmental pollution. The most environmentally friendly
method for waste disposal is to convert waste into a valuable commodity. In this study, cherry tree bark was used as
a dyestuff in paper production. Wild cherry (Cerasus avium L.) bark was boiled with water and KOH. The purpose
of using KOH is to increase the solubility of the bark compounds. The chemi-thermomechanical pulp (CTMP) was
dyed using the dyestuff. The alum mordant is used to fi x the dyestuff. Paper can be exposed to external infl uences
(mechanical, physical and biological) depending on the place of use. One of these effects is sunshine. When paper
is exposed to direct or indirect sunlight, paper changes its color. Depending on the place of use, it is expected that
the color of the paper will not be affected by the sunlight or that it will provide long-term strength after the application.
Accelerated weathering test was chosen to measure the UV resistance of the dyestuff. The results have shown
that the mordant has a signifi cant effect on the fi xation of dyestuff. After a total of 150 hours of weathering test, the
color change was observed to be the lowest in the paper samples to which alum mordant was added to the dyestuff
2019-12-15T00:00:00ZSurface characterization of weathered and heat-treated woodbased composites reinforced by styrene maleic anhydrideZor, MustafaCan, AhmetGardner, Douglashttp://hdl.handle.net/11772/23012020-01-14T00:00:30Z2019-09-20T00:00:00ZSurface characterization of weathered and heat-treated woodbased composites reinforced by styrene maleic anhydride
Zor, Mustafa; Can, Ahmet; Gardner, Douglas
The aim of this study was to investigate the effect of heat-treated lignocellulosic filler
on the surface characteristics and decay resistance of the wood flour/styrene maleic
anhydride (SMA) composites. In this study, heat treatment was conducted at 212 C
for 8 hours. Test specimens were prepared by injection molding at 220 C. Weathering
tests were performed by cycles of UV-light irradiation for 8 hours, water spray for
15 minutes, and then conditioning for 3.45 hours in an accelerated weathering test
cycle chamber. Heat-treated wood flour/SMA composites were evaluated for color
changes, and attenuated total reflectance Fourier transform infrared (FTIR) spectroscopy
was used to analyze chemical changes on the sample surfaces. The wood decay
tests were performed of white rot fungus, Trametes versicolor (L.: Fr.) Pilat was
based on mini-block specimens on 48% malt extract agar in petri dishes. The study
showed that color changes occurred when heat-treated filler rate is increased in this
material. Therefore, materials in 10% filler rate show lower color changes than other
variation. As a result of the FTIR analysis, the addition of wood filler into the SMA
causes changes in the chemical structure. In addition, the increase in wood filler
reduced the resistance to weathering. Decay results showed that thermally modified
wood has lower mass loss caused by fungal attack than untreated wood material. The
weight loss decreases with the increase in wood flour rate expect 10%T and 10%UT
in all composites.
2019-09-20T00:00:00ZAccelerated weathering and decay resistance of heat-treated wood reinforced polypropylene compositesCan, AhmetAltuntaş, ErtuğrulAydemir, DenizAlsan, MizginSivrikaya, Hüseyinhttp://hdl.handle.net/11772/18722019-10-03T00:00:20Z2019-10-27T00:00:00ZAccelerated weathering and decay resistance of heat-treated wood reinforced polypropylene composites
Can, Ahmet; Altuntaş, Ertuğrul; Aydemir, Deniz; Alsan, Mizgin; Sivrikaya, Hüseyin
The aim of this study was to determine the accelerated weathering and decay resistance of the heattreated wood reinforced polypropylene composites (HT-WPC). Polypropylene (PP) was used as a matrix and the heat-treated wood treated at 180 °C and 220 °C as reinforcement fi ller. The effect of three fi ller type, such as 40, 60 and 100 mesh, on the outdoor performance of composites was also investigated. The composites were prepared with twin screw extruder, and the test samples were obtained with compression molding. Lightness index (L*), color changes (ΔE*) and physical changes on the surface of the composites after the accelerated weathering, and
decay resistance of the composites were investigated. According to the results, the effects of heat-treated wood on color changes were found to be more than its fi ller size, and while the fi ller loadings were increased from 5 % to 20 %, it was determined to increase the color changes of the composites. In scanning electron microscopy (SEM) images, crack formation and deterioration on the surface of the composites were determined. In FTIR spectra, no difference was determined between the composites, and all peaks were similar to each one. The addition of heattreated wood improved the antifungal effi ciency of the composite, and the mass losses decreased with the increasing of heat treatment temperature. As a result, adding heat-treated wood to PP was found to improve the outdoor performance of the HT-WPCs.
2019-10-27T00:00:00ZSome physical and mechanical properties of maritime pine and poplar exposed to oil-heat treatmentTaşdelen, MehmetCan, AhmetSivrikaya, Hüseyinhttp://hdl.handle.net/11772/18712019-10-03T00:00:22Z2019-10-01T00:00:00ZSome physical and mechanical properties of maritime pine and poplar exposed to oil-heat treatment
Taşdelen, Mehmet; Can, Ahmet; Sivrikaya, Hüseyin
Oil-heat treatment is an environmentally friendly method to improve dimensional stabilization of wood. In this process, vegetable oil is used as a heating medium in different temperatures and times. In this study, maritime pine (Pinus pinaster marittima) and poplar (Populus euroamericana) samples subjected to oil heat treatment with safflower, linseed and hazelnut oil at 160 °C, 180 °C and 200 °C for 2,4 and 6 hours respectively. Water soaking was performed to untreated and oil-heat treated samples for two weeks. In this period water uptake and tangential swelling of the samples were measured. In addition, compression strength of the samples was determined parallel to the fiber direction. According to the results, oil-heat treatment considerably reduced the water uptake in maritime pine and poplar while the performance of only vacuum heat treatment was similar with control samples. The improvement in tangential swelling was clearly shown in the poplar samples rather than maritime pine. Vacuum-heat treatment and oil-heat treatment increased the compression strength of maritime pine compared to control samples.; Yağlı ısıl işlem ahşabın boyut stabilizasyonunu arttırmak için çevre dostu bir yöntemdir. Bu işlemde yağ farklı sıcaklık ve sürelerde ısı ortamı olarak kullanılmaktadır. Bu çalışmada; sahil çamı (Pinus pinaster marittima ) ve kavak (Populus euroamericana ) odun örnekleri aspir yağı, keten yağı ve fındık yağı ile 160 °C, 180°C ve 200°C’de 2,4 ve 6 saat süre ile ısıl işleme tabi tutulmuşlardır. Yağsız ve yağlı ısıl işleme maruz bırakılmış odun örnekleri için 2 hafta boyunca su alma testi gerçekleştirilmiştir. Bu süreçte örneklerin su alma ve teğetsel genişleme değerleri ölçülmüştür. Ayrıca örneklerin liflere paralel basınç direnci değerleri tespit edilmiştir. Elde edilen sonuçlara göre yağlı ısıl işlem sahil çamı ve kavak örneklerinin su alma oranlarını önemli ölçüde azaltırken, vakum altında ısıl işlem uygulanan örnekler kontrol ile benzer davranışlar sergilemiştir. Kavak örneklerinde teğetsel genişleme sahil çamı örneklerine kıyasla gözle görülür oranda iyileşmiştir. vakum-ısıl işlem ve yağlı ısl işlem kontrol örneklerine kıyasla sahil çamının basınç direncini artırmıştır.
2019-10-01T00:00:00Z