polymers
Article Experimental Study of Oriented Strand Board Ignition by Radiant Heat Fluxes
Ivana Turekov á 1 , Iveta Markov á 2, * , Martina Ivanovicˇov á 1 and Jozef Harang ó zo 1
1 Department of Technology and Information Technologies, Faculty of Education, Constantine the Philosopher University in Nitra, Tr. A. Hlinku 1, 949 74 Nitra, Slovakia; ivana.turekova@ukf.sk (I.T.); mabumb@gmail.com (M.I.); jozef.harangozo@ukf.sk (J.H.) 2 Department of Fire Engineering, Faculty of Security Engineering, University of Žilina, Univerzitn á 1, 010 26 Žilina, Slovakia * Correspondence: iveta.markova@fbi.uniza.sk; Tel.: +421-041-513-6799 Abstract: Wood and composite panel materials represent a substantial part of the fuel in many building fires. The ability of materials to ignite when heated at elevated temperatures depends on many factors, such as the thermal properties of materials, the ignition temperature, critical heat flux and the environment. Oriented strand board (OSB) without any surface treatment in thicknesses of 12, 15 and 18 mm were used as experimental samples. The samples were gradually exposed to a heat flux of 43 to 50 kW.m − 2 , with an increase of 1 kW.m − 2 . At heat fluxes of 49 kW.m − 2 and 50 kW.m − 2 , the ignition times are similar in all OSB thicknesses, in contrast to the ignition times at lower heat fluxes. The influence of the selected factors (thickness and distance from the heat source) was analysed based on the experimentally obtained data of ignition time and weight loss. The experimentally determined value of the heat flux density was 43 kW.m − 2 , which represented the critical heat flux. The results show a statistically significant effect of OSB thickness on ignition time.
Citation: Tureková, I.; Marková, I.; Ivanovicˇová, M.; Harangózo, J. Experimental Study of Oriented Strand Board Ignition by Radiant Heat Fluxes. Polymers 2021 , 13 , 709. https://doi.org/10.3390/polym1305 0709
Keywords: OSB; heat flux density; ignition time; weight loss
1. Introduction Composite panel materials are important wood products [1]. Their production encom- passes the utilization of wood of lower quality classes to obtain suitable materials with improved physical and mechanical properties [2]. Oriented strand board (OSB) belong to this group of products but essentially, these products are input materials in the furniture and construction industries [3]. The production of wood-based sheet materials utilizes wood of lower quality classes and chemically safe recyclates and generates materials with improved physical and me- chanical properties compared to raw wood [4]. Oriented strand boards (OSBs) are defined in [5] as multilayer boards made of wood strands of a specific shape, thickness and ad- hesiveness. Strands in the outer layers are oriented parallel to the length or width of the boards. Strands in the middle layer or layers may be oriented randomly or generally perpendicular to the strands of the outer layers [5]. Oriented strand board, also known as OSB, waferboard, Sterling board or Exterior board and SmartPly, is a widely used engineered wood product formed by strands (flakes) of wood, often layered in specific orientations [6]. In appearance, it may have a rough and variegated surface with the individual strands (typically around 2.5 by 15 cm each) lying unevenly across each other. OSBs are cheap and strong boards, and this makes them excellent building material [7]. OSB is produced from thinner wood strands, which can be arranged better with respect to the direction of the wood fibres when adding the layers in longitudinal and transverse directions in the production flow. Strands have the longest length in the direction of the fibres [8]. Thinner debarked forest wood assortments, predominantly soft deciduous
Academic Editor: Antonios N. Papadopoulos
Received: 1 February 2021 Accepted: 21 February 2021 Published: 26 February 2021
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Copyright: © 2021 by the authors. Licensee MDPI, Basel, Switzerland. This article is an open access article distributed under the terms and conditions of the Creative Commons Attribution (CC BY) license (https:// creativecommons.org/licenses/by/ 4.0/).
Polymers 2021 , 13 , 709. https://doi.org/10.3390/polym13050709
https://www.mdpi.com/journal/polymers
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