The Experts below are selected from a list of 315 Experts worldwide ranked by ideXlab platform
Oleg Shepelyuk - One of the best experts on this subject based on the ideXlab platform.
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properties of Plywood manufactured from compressed veneer as building material
Materials & Design, 2009Co-Authors: Pavlo Bekhta, Salim Hiziroglu, Oleg ShepelyukAbstract:The objective of this study is to evaluate some of the physical and mechanical properties of Plywood manufactured from compressed veneer of birch (Betula pubescens) and alder (Alnus glutinosa) using a cold rolling process. Surface roughness, tensile strength parallel and perpendicular-to-grain orientation of veneer sheets before and after compression process were tested. Shear strength, bending strength, and compression strength of the Plywood samples made from both compressed and non-compressed veneers were also determined. Based on the results of the study, overall mechanical properties of veneer and Plywood improved as compression degree veneer increased from 5% to 15%. This also resulted in less adhesive consumption up to 20% as well as enhanced surface characteristics of veneer samples by 40%. Plywood samples required lower pressure ranging from 25% to 30% for those manufactured from regular veneer. It appears that veneer compression process can be considered as an alternative method to improve both physical and mechanical properties of experimental Plywood panels which can be used for building applications.
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Properties of Plywood manufactured from compressed veneer as building material
Materials and Design, 2009Co-Authors: Pavlo Bekhta, Salim Hiziroglu, Oleg ShepelyukAbstract:The objective of this study is to evaluate some of the physical and mechanical properties of Plywood manufactured from compressed veneer of birch (Betula pubescens) and alder (Alnus glutinosa) using a cold rolling process. Surface roughness, tensile strength parallel and perpendicular-to-grain orientation of veneer sheets before and after compression process were tested. Shear strength, bending strength, and compression strength of the Plywood samples made from both compressed and non-compressed veneers were also determined. Based on the results of the study, overall mechanical properties of veneer and Plywood improved as compression degree veneer increased from 5% to 15%. This also resulted in less adhesive consumption up to 20% as well as enhanced surface characteristics of veneer samples by 40%. Plywood samples required lower pressure ranging from 25% to 30% for those manufactured from regular veneer. It appears that veneer compression process can be considered as an alternative method to improve both physical and mechanical properties of experimental Plywood panels which can be used for building applications. © 2008 Elsevier Ltd. All rights reserved.
Leena Ukkonen - One of the best experts on this subject based on the ideXlab platform.
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Automated Identification of Plywood Using Embedded Inkjet-Printed Passive UHF RFID Tags
IEEE Transactions on Automation Science and Engineering, 2013Co-Authors: J. Virtanen, Johanna Virkki, Lauri Sydänheimo, M. Tentzeris, Leena UkkonenAbstract:The use of passive ultra high-frequency (UHF) radio frequency identification (RFID) integrated into Plywood boards is proposed to enable the identification and tracking of individual Plywood boards and end products of Plywood. For the first time, tags are embeddable inside Plywood by direct inkjet-printing tag antennas on pure birch veneer. The use of passive UHF RFID technology in the applications of Plywood industry is discussed, two tag antenna designs for Plywood are presented and the tag fabrication procedures are described. Furthermore, results from tag performance measurements performed in the authentic application environment as well as in anechoic conditions are presented and discussed. Measurements show that tags printed on veneer and embedded inside 2 mm thick Plywood board exhibited theoretical read ranges from 7.9 to 10.1 meters. The read ranges obtained meet the demands of the Plywood industry and offer reliable identification even in challenging environments.
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Performance of UHF RFID tags printed directly on Plywood structures
International Journal of RF Technologies: Research and Applications, 2012Co-Authors: Johanna Virkki, Sari Merilampi, Leena Ukkonen, Lauri SydänheimoAbstract:The integration of electronics and wood is an interesting research area due to increasing interest to add functionality in various products. In this study, we will concentrate on Plywood. The use of Plywood as a substrate for printed passive UHF RFID tags was examined. First, the characteristics of the birch Plywood material were examined. After this, the tags were screen printed on birch Plywood and their performance was evaluated in unloaded conditions, after a 100% relative humidity test, and after a cyclic bending test. The mechanical properties of the Plywood were dependent on temperature history as well as moisture in the structure. The electrical properties of the thin Plywood material itself did not affect much the tag performance compared to traditional plastic substrate. Different environmental stresses were found to slightly affect the tag functioning parameters but the tag will nevertheless perform its required functions under these stressed conditions. According to these results, screen printed RFID tags have a great potential in automatic identification and supply chain control of various Plywood products. Since the response of the tags on Plywood was affected by prevailing circumstances, the tag could be utilized in sensing applications in addition to automatic identification. © 2011 - IOS Press and the authors. All rights reserved.
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Embedding inkjet-printed antennas into Plywood structures for identification and sensing
2012 IEEE International Conference on RFID-Technologies and Applications (RFID-TA), 2012Co-Authors: Johanna Virkki, Leena Ukkonen, Lauri Sydänheimo, J. Virtanen, M. TentzerisAbstract:The embedding of radio frequency identification (RFID) tags into Plywood boards will enable the identification and tracking of individual Plywood boards and end products of Plywood. Even more benefits can be achieved by adding sensing functions into these tags. We present tags that are embeddable inside Plywood by direct inkjet-printing on pure birch veneer. The use of passive UHF RFID technology in the Plywood industry is discussed, two tag antenna designs for Plywood are presented and the tag fabrication procedures are described. Furthermore, tag performance measurement results from various setups are presented to verify the concept of embedding RFID and sensor antennas into Plywood structures. Measurements show that tags printed on veneer and embedded inside 2 mm thick Plywood board exhibited theoretical read ranges from 7.9 meters to 10.3 meters. The read ranges obtained meet the demands of the Plywood industry and offer reliable identification even in challenging environments.
Pavlo Bekhta - One of the best experts on this subject based on the ideXlab platform.
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properties of Plywood manufactured from compressed veneer as building material
Materials & Design, 2009Co-Authors: Pavlo Bekhta, Salim Hiziroglu, Oleg ShepelyukAbstract:The objective of this study is to evaluate some of the physical and mechanical properties of Plywood manufactured from compressed veneer of birch (Betula pubescens) and alder (Alnus glutinosa) using a cold rolling process. Surface roughness, tensile strength parallel and perpendicular-to-grain orientation of veneer sheets before and after compression process were tested. Shear strength, bending strength, and compression strength of the Plywood samples made from both compressed and non-compressed veneers were also determined. Based on the results of the study, overall mechanical properties of veneer and Plywood improved as compression degree veneer increased from 5% to 15%. This also resulted in less adhesive consumption up to 20% as well as enhanced surface characteristics of veneer samples by 40%. Plywood samples required lower pressure ranging from 25% to 30% for those manufactured from regular veneer. It appears that veneer compression process can be considered as an alternative method to improve both physical and mechanical properties of experimental Plywood panels which can be used for building applications.
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Properties of Plywood manufactured from compressed veneer as building material
Materials and Design, 2009Co-Authors: Pavlo Bekhta, Salim Hiziroglu, Oleg ShepelyukAbstract:The objective of this study is to evaluate some of the physical and mechanical properties of Plywood manufactured from compressed veneer of birch (Betula pubescens) and alder (Alnus glutinosa) using a cold rolling process. Surface roughness, tensile strength parallel and perpendicular-to-grain orientation of veneer sheets before and after compression process were tested. Shear strength, bending strength, and compression strength of the Plywood samples made from both compressed and non-compressed veneers were also determined. Based on the results of the study, overall mechanical properties of veneer and Plywood improved as compression degree veneer increased from 5% to 15%. This also resulted in less adhesive consumption up to 20% as well as enhanced surface characteristics of veneer samples by 40%. Plywood samples required lower pressure ranging from 25% to 30% for those manufactured from regular veneer. It appears that veneer compression process can be considered as an alternative method to improve both physical and mechanical properties of experimental Plywood panels which can be used for building applications. © 2008 Elsevier Ltd. All rights reserved.
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reduction of glue consumption in the Plywood production by using previously compressed veneer
European Journal of Wood and Wood Products, 2007Co-Authors: Pavlo Bekhta, R MarutzkyAbstract:The production of Plywood from previously compressed veneer allows to save up to 25% of glue, to halve the roughness of veneer and Plywood and to press the Plywood at a 22% lower pressure. However, the thickness of Plywood reduces from 8.3 mm for uncompressed veneer to 6.4–8.0 mm for compressed veneer, and the density increases from 793 kg/m3 to 807–1005 kg/m3 accordingly.
Gursel Colakoglu - One of the best experts on this subject based on the ideXlab platform.
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effects of moisture content on formaldehyde emission and mechanical properties of Plywood
Building and Environment, 2006Co-Authors: Ismail Aydin, Semra Colak, Gursel Colakoglu, Cenk DemirkirAbstract:Abstract Wood is a hygroscopic material and has ability to exchange its moisture content with air. Many mechanical properties are affected by changes in moisture content below the fiber saturation point of wood. This study evaluates the formaldehyde emission and some mechanical properties of poplar and spruce Plywood panels manufactured from rotary cut veneers having different moisture content by using urea–formaldehyde (UF) and modified urea formaldehyde by melamine (M+UF). Rotary cut veneers obtained from poplar and spruce logs were classified into three groups and veneers in each group were then conditioned in a climate chamber to either 4–6%, 10–12% or 16–18% moisture content. Plywood panels with three plies and in 6 mm thickness were manufactured for each group. Formaldehyde emission, shear strength, bending strength and modulus of elasticity values of Plywood panels were determined. Best bonding results were obtained in Plywood panels with veneers having 4–6% moisture content. Lowest mechanical properties were found for Plywood panels manufactured from veneers conditioned to 16–18% moisture content. Formaldehyde emission values of poplar and spruce Plywood panels decreased with increasing veneer moisture content for both glue types. Formaldehyde emission content of panels decreased with melamine addition into the urea formaldehyde glue mixture.
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volatile acetic acid and formaldehyde emission from Plywood treated with boron compound
Building and Environment, 2004Co-Authors: Semra Colak, Gursel ColakogluAbstract:The effects of Plywood on formaldehyde and volatile acetic acid emissions treated with borax and boric acid were investigated. The treated Plywood samples were manufactured by using two different methods; each veneer was first impregnated by a dipping method before the first group of Plywood was manufactured. The second group of Plywood panels was produced by adding preservatives (borax, boric acid) into the glue mixture. Two types of urea formaldehyde resin and phenol formaldehyde resin were used as adhesives. The formaldehyde emissions of the Plywood were measured by using desiccator method (JIS-A-5908). The amount of acetic acid in distilled water taken from the desiccator was determined by using high performance liquid chromatography. The results revealed that boron compounds affected the emission values of panels differently. Borax showed decreasing effect on the formaldehyde emission, whereas boric acid showed increasing effect.
Xiaoning Lu - One of the best experts on this subject based on the ideXlab platform.
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preparation of hydro thermal surface densified Plywood inspired by the stiffness difference in sandwich structure of wood
Construction and Building Materials, 2018Co-Authors: Junfeng Wang, Xuan Wang, Tianyi Zhan, Yaoli Zhang, Chao Lv, Qian He, Lu Fang, Xiaoning LuAbstract:Abstract Inspired by stiffness difference in the “sandwich structure” of earlywood and latewood, surface-densified (SD) Plywood was manufactured based on a hydro-thermal approach. A series of veneer moisture contents (MCs) and hot-pressing temperatures were selected to prepare the SD Plywood. Great surface densification was observed according to density distribution through Plywood thickness. The densification was attributed to the thermal softening and mechano-sorptive behavior of constituents in the wood cell wall. A greater degree of surface densification could be achieved at higher hot-pressing temperatures or higher surface veneer MCs. Final MCs of the SD Plywood met the requirement of the Chinese national standard. No significant variation was observed for the bonding strength among SD and control (CK) Plywood. Mechanical properties – including modulus of rupture (MOR), modulus of elasticity (MOE) and hardness – of the SD Plywood were significantly higher than the CK Plywood. The enhancements of MOR, MOE and hardness could be attributed to its high-density surfaces. The greatest increment of MOR, MOE and hardness was 54, 104 and 144%, respectively. Comparing to some domestic Chinese hardwood species, SD Plywood possessed greater surface hardness with less average density. The results indicated that, inspired by the stiffness difference in the “sandwich structure” of wood, preparation of the SD Plywood based upon hydro-thermal treatment is feasible.
