Yazar "As, Nusret" seçeneğine göre listele
Listeleniyor 1 - 20 / 20
Sayfa Başına Sonuç
Sıralama seçenekleri
Öğe Classification of wood species grown in Turkey according to some physico-mechanic properties(Istanbul Univ, Fac Forestry, 2016) As, Nusret; Dündar, Türker; Büyüksarı, ÜmitClassgroupsformedon the basis ofphysico-mechanical values, and the distribution ofgrown in Turkeytree species havebeen made in these classes. In classification, air dry12-15% density, shrinkage, bending strength, modulus of elasticity in bending, impactbending, compression, tensile, cleavage, shearingstrength and hardnessvalues were used.Öğe Comparison of Micro- and Standard-Size Specimens in Evaluating the Flexural Properties of Scots Pine Wood(North Carolina State Univ Dept Wood & Paper Sci, 2016) Büyüksarı, Ümit; As, Nusret; Dündar, Türker; Sayan, EzelThe aim of this study was to investigate the flexural properties (bending strength and modulus of elasticity) of Scots pine wood (Pinus sylvestris L.) using micro-and standard-size test specimens. In the standard-and micro-size specimens, the average bending strengths were evaluated as 72.8 and 62.4 MPa, and the bending modulus of elasticity was 9917 and 2884 MPa, respectively. These results showed that the bending strength and modulus of elasticity values of the micro-size specimens were lower than those of the standard-size specimens. The statistically significant effects included the specimen size, individual trees, and the interactions of the specimen size and trees on the bending strength and modulus of elasticity. Furthermore, regression analyses indicated a positive linear regression between the flexural properties of the micro-and standard-size specimens. The results indicated that micro-size specimens can be used to estimate the flexural properties of Scots pine wood when obtaining standard-size specimens is not possible.Öğe COMPARISON OF TWO KILN-DRYING SCHEDULES FOR TURKISH HAZEL (Corylus colurna) LUMBER OF 5-CM THICKNESS(Univ Bio-Bio, 2018) Korkut, Süleyman; As, Nusret; Büyüksarı, ÜmitTurkish hazel (Corylus colurna) lumber with a nominal thickness of 5 cm from the Kastamonu region, Turkey, was dried through conventional kiln drying using two different programs, a non-protective drying schedule and a protective drying schedule. The goal of the study was to obtain a kiln schedule that would maintain wood quality and also save drying time until a final moisture content of 8 +/- 2% was reached. The intensity of warping (twisting, bowing, cupping, crooking), superficial, internal, and end checks, residual stresses, drying rate, and moisture gradient of the dried woods were measured, and the results were evaluated according to the classification of the European Drying Group. The results showed a more homogeneous moisture profile, fewer occurrences of superficial checks, and an absence of internal checks when using the protective drying schedule due to low warping values compared with those for the non-protective drying schedule. From the point of view of energy efficiency, by saving 60 h of drying time, the non-protective schedule reduced electricity by 960 KWh and was therefore more profitable by $105,60 in this trial. Therefore, it seems that the protective drying schedule should be recommended as the optimum program for drying Turkish hazel lumber from the Kastamonu region at the commercial scale.Öğe Determination of epoxy resin usability for mass production of reinforced laminated veneer lumber(Sage Publications Ltd, 2022) Çiftçi, Seymen; Ciritcioğlu, Hasan Hüseyin; As, Nusret; Tankut, NurgülThis study is part of a comprehensive study on the industrial production of reinforced laminated wood composites. The main aim of the study is to determine the production parameters of reinforced laminated wood composite board under an optimal production cycle time under temperature and pressure, using epoxy resin cured at room temperature for 24 h. For this purpose, 1.2 mm thick Samsun Poplar (Populus Deltoides I-77/51) veneer layers, three different pressing cycle times (15, 20, and 25 min), three different temperatures (100 degrees C, 120 degrees C, and 140 degrees C), and three different amounts of adhesive (100, 150, and 200 g/m(2)) were used also 200 g/m(2) density twill woven glass-carbon fiber fabric was used as the reinforcement layer. In order to determine the production quality of reinforced laminated wood composite boards, the adhesion strength between the reinforcement layer and the wood veneer layer was determined according to TS EN 3969 314-1. Considering the adhesion strengths in terms of production parameters, the best results were observed at 100 degrees C press temperature, 20 min press cycle time, 200 g/m(2) adhesive amount, and the use of glass fiber woven fabrics for reinforcement. Under these conditions, the best adhesion strength was found to be 4.17 N/mm(2). When the samples were examined, it was seen that almost all of the failures occurred as a result of the fracture in the wood layer. This indicates that sufficient adhesion can be achieved between the reinforcement layer and the wood layer.Öğe The effect of bending parameters on mechanical properties of bent oak wood(Springer, 2018) As, Nusret; Hindman, Daniel; Büyüksarı, ÜmitThe aim of this study was to investigate the mechanical properties of oak (Quercus petraea Liebl.) wood bent at different radii for locations of the tension and compression sides of wood using micro-mechanical test specimens. Two oak trees having straight stems with approximately 40 cm diameter were selected and two 4 m long logs were cut. Two different steaming pressures, two setting methods, and three different bending radii were examined. Additionally, a set of three controls was unbent. Mechanical properties including the modulus of rupture, modulus of elasticity in bending, tension and compression strength parallel to grain were measured from the convex and concave sides of all samples. Bending strength, modulus of elasticity in bending, tension strength and compression strength properties on convex sides were greater than the corresponding properties on concave sides. All strength values significantly decreased with decreasing bending radius on both sides. On the convex side, strength and stiffness values of oak wood at 300 mm radius were greater when compared to control groups while the strength and stiffness values of oak wood were lower for 100 mm radius. The values for 200 mm radius, on the other hand, were not significantly different compared to the control group value. On the concave side, all of the bent groups had significantly lower strength and stiffness values than that of control group. The effect of bending radius and setting method on the strength and stiffness values of oak wood was statistically significant on both concave and convex sides. The effect of steam pressure was not significant.Öğe The effect of boiling time on the surface roughness of rotary-cut veneers from oriental beech (Fagus orientalis L.)(Elsevier Science Sa, 2008) Dündar, Türker; As, Nusret; Korkut, Süleyman; Ünsal, ÖnerThe objective of this study was to investigate effects of boiling time on surface roughness of beech (Fagus orientalis L.) veneer manufactured using the rotary cutting method. Three logs of oriental beech were subjected to softening process by boiling them in water (60-70 degrees C) for various times (e.g. 20,40, and 60 h) and they were peeled immediately. For surface roughness, veneer samples were taken from outer, center, and inner (near to pit) parts of logs and the distance of the locations where the samples were taken from the pith were the same. Veneer specimens have a dimension of 10 cm (width) by 20 cm (length) by 0.14 cm (thickness). Three roughness parameters, average roughness (R-a), mean peak-to-valley height (R-z), and maximum roughness (R.) for each group were measured according to DIN standard 4768 by using stylus profilometer and compared with one another. Except the boiling time, other factors (species, knife angle, peeling angel, etc.) were kept the same. The results show that, the surface of veneers, taken from heartwood and center of the logs boiled 60 h were significantly rougher than 20 and 40 h. But peeling veneers obtained from sapwood of logs boiled 20 h displayed significantly rougher surface than 40 and 60 h. For all samples, applying 40-h boiling period can minimize the roughness value. Therefore, it seems that 40-h boiling period is suitable in order to minimize the surface roughness of rotary-cut veneers manufactured from all of beech (F. orientalis L.) logs parts (inner, center, and outer) (C) 2007 Elsevier B.V. All rights reserved.Öğe Effect of Heat Treatment of Wild Cherry Wood on Abrasion Resistance and Withdrawal Capacity of Screws(Zagreb Univ, Fac Forestry, 2015) Aytin, Ayhan; Korkut, Süleyman; As, Nusret; Ünsal, Öner; Gündüz, GökhanIn its wise use, many properties of wood are important. Among these properties, wood abrasion resistance (AR) and withdrawal capacity of screws (WCS) are deemed to be relatively significant. It is well know that heat treatment changes the resistance features of wooden materials by changing the structural characteristics of wood. Within the scope of this study, the effects were investigated of the temperature and duration of heat treatment of Wild Cherry (Cerasus avium (L.) Monench) on its AR and its WCS in the radial direction and tangential direction. The test results indicated that weight loss (WL) and thickness reduction (TR) remained almost the same in the radial direction specimen, but there was significant TR in the tangential direction specimen. As a result of these changes, the abrasion effect of the S-42 abrader diminished based on the increase in the number of cycles. However, in both the radial and tangential direction, the WCS decreased to a significantly greater extent in the heat-treated specimens than in the control specimens.Öğe FARKLI ÖN İŞLEMLERİN AHŞABIN YAPIŞMA PERFORMANSINA ETKİLERİ(Düzce Üniversitesi, 2017) Şendağ, Akın; Akkılıç, Hüseyin; As, NusretBu çalışmanın amacı kayın (FagusSpp.) odununda farklı ön işlemlerin yapışma performansına olan etkisinibelirlemektir. Bu amaçla oluşturulan 3 gruptan ikisine buharlama ve termik önişlemleri uygulanmıştır. Aynı kerestelerden kontrol örnekleri dehazırlanmıştır. Yapıştırmada su bazlı polimerik D3 tutkalı kullanılmıştır.Testler TS EN 205 standardına göre gerçekleştirilmiştir. Sonuç olarak, gruplarınortalama yapışma direnci değerleri sırasıyla, kontrol grubu için 12,48 N/mm2, buharlanmışahşap için 12,88 N/mm2 nbsp;veısıl işlem görmüş ahşap için 7,22 N/mm2 bulunmuştur. nbsp;Yapışma performansı bakımındandiğer iki grup arasında anlamlı farklılık yokken ısıl işlem görmüş ahşapörneklerde %95 güven düzeyinde anlamlı farklılık bulunmuştur. nbsp;Öğe Intra-Ring Properties of Earlywood and Latewood Sections of Sessile Oak (Quercus petraea) Wood(North Carolina State Univ Dept Wood & Paper Sci, 2018) Büyüksarı, Ümit; As, Nusret; Dündar, TürkerStrength attributes of isolated microscopic sections of earlywood (EW) and latewood (LW) tissues are evaluated for sessile oak (Quercus petraea). The properties measured at the micro-scale were then used to estimate the macroscopic strength characteristics of the wood. The bending strength, modulus of elasticity (MOE) in bending, and tensile strength of EW and LW sections were determined. The EW and LW ring width, annual ring width, and LW proportion were also determined. The estimated values were calculated using the EW and LW mechanical properties and LW proportions, while the measured values were determined using standard-sized test samples. The LW sections had higher values than the EW sections for all measured mechanical properties. The average EW and LW widths and LW proportion were 0.50 mm, 0.49 mm, and 49.3%, respectively. The estimated bending strength, MOE, and tensile strength values were 80.1 MPa, 2831.7 MPa, and 112.1 MPa, respectively. The estimated bending strength and MOE values were lower than the measured values, while the estimated tensile strength values were higher than the measured values.Öğe KOHEZİF KUVVETLERDEKİ AZALMANIN KAYIN AHŞABININ BAZI MEKANİK ÖZELLİKLERİ ÜZERİNE ETKİSİ(Düzce Üniversitesi, 2017) Akkılıç, Hüseyin; Şendağ, Akın; As, NusretBu çalışmada rutubet artışınabağlı olarak birim alandaki hücre çeper miktarı azalışının ve kohezifkuvvetlerdeki azalmanın ahşabın yük taşıma kapasitesi üzerine etkisiaraştırılmıştır. İlgili standarda göre basınç numuneleri hazırlanmış ve havakurusu (%12) hale gelinceye kadar klimatize edilmiş ve iki gruba ayrılmıştır.İlk grup hava kurusu halde, ikinci grup ise LDN üstü rutubetlerde testedilmiştir. Basınç yüklemesinde maksimum yükler en kesit ölçülerinden bağımsızolarak değerlendirilmiştir. Bu şekilde, kohezif kuvvetlerdeki azalmanın ahşabınyük taşıma kapasitesi üzerine etkisi araştırılmıştır. Ayrıca maksimum gerilmedeğerleri her iki rutubette karşılaştırılarak kohezif kuvvet azalması ilebirlikte birim alandaki çeper azalmasının da direnç üzerine etkisibelirlenmiştir. nbsp;Sonuç olarak kohezifkuvvetlerdeki azalmanın birim alandaki çeper azalmasına göre daha etkili olduğuanlaşılmıştır.Öğe Mechanical Properties of Earlywood and Latewood Sections of Scots Pine Wood(North Carolina State Univ Dept Wood & Paper Sci, 2017) Büyüksarı, Ümit; As, Nusret; Dündar, TürkerThe aim of this study was to determine the mechanical properties of earlywood (EW) and latewood (LW) sections of Scots pine (Pinus sylvestris L.) wood, and determine the relationship between calculated and measured values. The bending strength, modulus of elasticity in bending, and the tensile strength of EW and LW sections were determined. The mechanical properties were calculated using EW and LW mechanical properties and LW proportion. Also, mechanical properties were determined in standard size samples and compared to the calculated properties. In earlywood and latewood sections, the bending strength was 37.3 MPa and 93.9 MPa, the modulus of elasticity in bending was 1557.6 MPa and 3600.4 MPa, and the tensile strength was 58.6 MPa and 189.6 MPa, respectively. The results showed that the LW section had higher mechanical properties than those of the EW section for all of the measured mechanical properties. The calculated bending strength, modulus of elasticity, and tensile strength values were 53.3 MPa, 2133.7 MPa, and 95.5 MPa, respectively. The calculated bending strength and modulus of elasticity values were lower compared to the measured values, while the calculated tensile strength values were higher than that of the measured values.Öğe MICRO-MECHANICAL PROPERTIES OF OAK WOOD AND COMPARISON WITH STANDARD-SIZED SAMPLES(Univ Bio-Bio, 2017) Büyüksarı, Ümit; As, Nusret; Dündar, Türker; Korkmaz, OgünThe aim of this study was to investigate micro-mechanical properties of Oak (Quercus petraea) wood and to compare with standard-size test specimens values. Bending strength, modulus of elasticity in bending, compression strength and tensile strength were determined using micro-and standard-size mechanical test samples. In the micro- and standard size samples, bending strengths were evaluated as 71,2 MPa and 99,4 MPa, modulus of elasticity in bending as 2741,3 MPa and 11394,1 MPa tensile strengths as 98,7 MPa and 93,8 MPa and compression strengths as 45,4 MPa and 46,6 MPa respectively. The results showed that the bending strength, modulus of elasticity and compression strength of the micro-size samples were lower compared to the standard-size samples, while the tensile strength was higher in the micro-size samples. The compression strength values of micro-and standard-size samples were not significantly different. The regression analyses indicated a positive linear regression between the mechanical properties of micro-and standard-size samples. Micro-size specimens can be used to estimate the mechanical properties of Oak wood when obtaining standard-size specimens is not possible.Öğe Micro-Tensile and Compression Strength of Scots Pine Wood and Comparison with Standard-Size Test Results(Zagreb Univ, Fac Forestry, 2017) Büyüksarı, Ümit; As, Nusret; Dündar, Türker; Sayan, EzelThe goal of this study was to investigate the tensile and compression strength of Scots pine wood (Pinus sylvestris L.) using micro- and standard-sized test specimens. In the standard- and micro-sized specimens, tensile strength was evaluated as 76.9 MPa and 91.5 MPa and compression strength as 43.8 MPa and 36.3 MPa, respectively. The results showed that the compression strength of the micro- sized specimens was lower compared to the standard-sized specimens, while the tensile strength was higher in the micro- sized specimens. With the exception of the effect of specimen size and individual tree interaction on tensile strength, statistically significant effects were found for specimen size, individual trees and the interactions of the size and trees on the tensile and compression strength. Moreover, regression analyses indicated a positive linear regression between the strength of micro- and standard-sized specimens. Micro-sized specimens can be used to estimate the tensile and compression strength of Scots pine wood, when it is not possible to obtain standard-size specimens.Öğe Non-destructive evaluation of beech and oak wood bent at different radii(Elsevier Sci Ltd, 2013) Büyüksarı, Ümit; As, NusretThe aim of this study was to investigate the parallel and perpendicular velocity and transmission time of beech and oak wood bent at different radii. Two trees from each wood species, having straight trunks of approximately 40 cm in diameter, were selected, and two 4-m logs were cut from each tree. The prepared samples, except those from the control groups, were steamed, bent and set. The samples were bent at three different radii (300 mm, 200 mm and 100 mm) in the tangential direction. The density, parallel and perpendicular (radial and tangential) velocity and transmission times of the beech and oak wood were determined. The results of this study showed that the bent samples of beech and oak wood had higher density compared to the unbent groups. The density of both wood species increased with the decreasing bending radius. The highest velocity parallel to the fibers was measured on the convex surface, while the lowest was measured on the concave surface. The parallel and perpendicular velocity decreased as the bending radius decreased. (c) 2013 Elsevier Ltd. All rights reserved.Öğe Optimizing Lumber Drying Schedules For Oriental Beech and Sessile Oak Using Acoustic Emission(North Carolina State Univ Dept Wood & Paper Sci, 2020) Unsal, Oner; Dundar, Turker; Gorgun, Hizir Volkan; Kaymakci, Alperen; Korkut, Suleyman; As, NusretThe aim of this work was to detect sounds providing evidence of the creation of drying defects and to correlate such data with drying quality. A further goal was to establish sound wave thresholds of ideal drying through the drying process by using an acoustic emission (AE) monitoring method. Thus, it is projected to decrease long drying times and also drying costs by reaching to ideal drying schedules. In this study, commercially preferred sessile oak and oriental beech structural lumbers were dried with three different schedules in a conventional kiln. The lumbers were listened to with AE sensors while drying according to the first two schedules, which were called protective and severe, respectively. AE events of the drying experiments were compared with ambient conditions and drying classes according to the standard of European Drying Group. The third drying schedule was optimized based on the AE peaks and applied. The results showed that ideal drying times were reduced up to 19% relative to the protective drying schedule, while obtaining the same drying quality for both species.Öğe SARIÇAM KERESTESİNİN KURUTULMASINDA AKUSTİK EMİSYON YÖNTEMİNİN KULLANILMASI(Düzce Üniversitesi, 2016) Ünsal, Öner; Dündar, Türker; As, Nusret; Korkut, Süleyman; Görgün, H. Volkan; Kaymakçı, AlperenTÜBİTAK 1001 projesi (Proje no: 112-O-818) olarak yapılan çalışmada, teknik olarak kurutulması güç ve uzun süreli olan Sapsız Meşe (6cm) ve Doğu Kayını (8cm) kerestesi yanında, 10 cm kalınlığında Sarıçam kerestesini kurutmada akustik emisyon (AE) yöntemini kullanarak, ağaç malzemeyi tahrip etmeden ulaşabilecek minimum kurutma sürelerini veren kurutma programlarının belirlenmesi hedeflenmiştir. AE yönteminde hedef, AE cihazı yardımıyla kurutma sürecinde ağaç malzemede oluşması muhtemel çatlak ve deformasyon gibi kusur oluşumlarını haber veren ses dalgalarını tespit etmek ve bu noktada kurutma şartlarına anında müdahale ederek kusur oluşumunu ortadan kaldırmaktır. Bu amaçla, önceden belirlenmiş kurutma programlarını uygularken AE cihazıyla eş zamanlı olarak ölçümler alınmış, bu süreçte sürekli ses dalgalarının takibi yapılarak kusurların oluşumunu haber veren frekanslarla ilgili eşik değerler belirlenmiş, daha sonra yapılan kurutma denemelerinde de bu eşik değerleri aşan durumlarda kurutma şartlarından ortam sıcaklığı ve bağıl nemine müdahale edilerek o ağaç türünün o kalınlığı için uygulanabilecek optimum kurutma programına ulaşılması sağlanmıştır. Bu sayede, hem haftalar veya aylar süren kurutma sürelerinin aşağı çekilmesi ve hem de ciddi maliyet oluşturan kurutma giderlerinden önemli tasarruflar sağlanması öngörülmüştür. Sarıçam kerestesiyle yapılan ve AE ölçümleriyle kombine edilen kurutma denemeleri sonunda, 10 cm'lik Sarıçam için, %50-15 kereste nemi aralığında, kurutma kusurlarının ve kurutma giderlerinin minimize edildiği ideal kurutma süresinin 10 gün olabileceği ve bu sayede kurutma giderlerinden %35'e varan oranda tasarruf sağlanabileceği belirlenmiştirÖğe THERMOWOOD YÖNTEMİ İLE ISIL İŞLEMİN YABANİ KİRAZ ODUNUNDA BAZI MEKANİK ÖZELLİKLER ÜZERİNE ETKİSİ(Düzce Üniversitesi, 2017) Aytin, Ayhan; Korkut, Süleyman; Ünsal, Öner; As, NusretBu çalışmadaki amaç değişik sıcaklık ve sürelerde kombinasyonlaroluşturularak ThermoWood yöntemi ile ısıl işleme tabi tutulan Yabani Kiraz (Cerasus avium(L.) Monench) odununda bazımekanik direnç değerlerinin değişimi belirlenmiştir. nbsp; Deneme ağaçları ilk olarak 190°C ve 212°Csıcaklıklarda 1 ve 2 saat ısıl işleme tabi tutulmuş ve ThermoWood Yabani Kiraz(Cerasus avium(L.) Monench) eldeedilmiştir. Daha sonra kontrol grubu(1) ve ThemoWood(4) olmak üzere hazırlananküçük boyutlu test örneklerine statik eğilme ve statik eğilmede elastikiyetmodülü testleri uygulanmıştır. Test sonuçları ısıl işlem görmüş tüm gruplardakontrol örneklerine göre; statik eğilme direnci değerinin azaldığını, bunakarşılık statik eğilmede elastikiyet modülünde ise tüm gruplarda artış olduğunuortaya koymuştur. nbsp; nbsp;Öğe THERMOWOOD YÖNTEMİ İLE ISIL İŞLEMİN YABANİ KİRAZ ODUNUNDA YOĞUNLUK, BOYUTSAL STABİTE VE BASINÇ DİRENCİ ÜZERİNE ETKİSİ(Düzce Üniversitesi, 2016) Aytin, Ayhan; Korkut, Süleyman; Ünsal, Öner; As, Nusret; Çakıcıer, NevzatAğaç malzemenin ısıl işlemi, 1990 yıllardan itibaren ondan daha rasyonel yararlanmaya yönelik adımların bir parçası olarak önem kazanan bir modifikasyon yöntemidir. Isıl işlem ile bazı kullanım yerleri için çevreye zararlı herhangi bir etki meydana getirilmeden yapısı değiştirilmiş ağaç malzeme elde edilmektedir. Çeşitli ağaç türleri üzerinde farklı yöntemler ile ısıl işlem uygulanarak elde edilen sonuçlara göre belli bir disiplin oluşturulurken aynı zamanda kullanıcılar da uygun malzeme konusunda yönlendirilmektedir. Bu çalışmada, Yabani Kiraz (Cerasus avium(L.) Monench) odunu ThermoWood yöntemi ile 190°C ve 212°C sıcaklıklarda 1 ve 2 saat ısıl işleme tabi tutulduktan sonra bazı fiziksel ve mekanik özellikler araştırılmıştır. Fiziksel özelliklerden elde edilen sonuçlar kontrol örneklerine göre ısıl işlem ile birlikte tam kuru özgül ağırlık, hava kurusu özgül ağırlık, daralma ve genişleme miktarlarının azaldığı, mekanik özeliklerden liflere paralel basınç direncinde ise çok önemli bir değişim olmadığı belirlenmiştir.Öğe Türkiye'de yetişen ağaç türlerinin bazı fiziko-mekanik özellikleri bakımından sınıflandırılması(2016) Büyüksarı, Ümit; Dündar, Türker; As, NusretTürkiye'de yetişen bazı ağaç türlerinin sahip oldukları Fiziko-mekanik değerler esas alınarak mevcut ya da oluşturulmuş bulunan sınıf gruplarına dağılımı yapılmıştır. Sınıflandırmada genelde belirlenmiş olan fiziksel özelliklerden hava kurusu % 12-15 yoğunluk, daralma, mekanik özelliklerden eğilme direnci, eğilmede elastikiyet modülü, dinamik eğilme, basınç, çekme, yarılma, makaslama dirençleri ve sertlik değerleri dikkate alınmıştır.Öğe WETTABILITY AND SURFACE ROUGHNESS OF NATURAL AND PLANTATION-GROWN NARROW-LEAVED ASH (Fraxinus angustifolia Vahl.) WOOD(North Carolina State Univ Dept Wood & Paper Sci, 2011) Büyüksarı, Ümit; Akbulut, Turgay; Güler, Cengiz; As, NusretPlantation-grown wood species are becoming more important. Their anatomical, physical, and mechanical properties are different and generally more variable than wood grown in natural stands. The objective of this study was to investigate the wettability and surface roughness (SR) of natural and plantation-grown narrow-leaved ash (Fraxinus angustifolia Vahl.) wood. The logs were cut from a natural stand versus three different spacings of plantation-grown narrow-leaved ash wood stands. Plantation spacings were 3 x 2 m, 3 x 2.5 m, and 4 x 4 m. The wetting behavior of the wood samples was characterized by the contact angle (CA) method (goniometer technique). A stylus type profilometer was used for the SR measurement according to the DIN 4768 (1990) standard. The SR and CA measurements were done on both the radial and tangential surfaces of the samples. Individual values of both SR and CA of ash wood showed statistically significant differences. Based on the findings, it appears that the natural-grown ash wood have higher (less favorable) SR and lower (more favorable) CA values compared to all the plantation-grown ash wood on both radial and tangential surfaces. Tangential surfaces had lower SR values and higher CA values than the radial surfaces for all groups. In conclusion, plantation-grown narrow-leaved ash wood can be utilized for bonded wood products such as plywood, laminated veneer lumber, and glulam.
