Oriented Strand Board Research Papers (original) (raw)

A prime function of a weather resistive barrier (WRB) is to shed the water, which may penetrate the cladding. Furthermore, the WRB functions to reduce airflow and control transport of water vapour through a wall. This means that the moisture balance of the material adjacent to WRB will be strongly affected by the water vapour flow caused by thermal drive that in turn may vary depending on the outdoor temperature or solar radiation. In other words, WRB products must be evaluated with a view to the way in which they will contribute to the performance of a wall system. This paper provides a first step in this direction.

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- Oriented Strand Board, Water vapour

The oscillatory behavior in the mature phase of some technologies'diffusion-related S curves are investigated, specifically with regard to the influences that other technologies can have on the oscillations. The notion of mortality indicators is raised, that is, whether such behavior is a signal that the mature technology is under attack from an emerging technology. The case of structural panels in the wood products industry is considered as an example, and an updated forecast of the substitution of oriented strand board for plywood is made. It is concluded that factors such as macroeconomic business cycles are primarily responsible for the oscillations in plywood's S-curve, although it is argued that an emerging technology can also contribute to perturbations in a mature technology's S-curve. Two possible alternative explanations for the oscillatory behavior are also discussed, a previously proposed chaos formulation, and a mathematical model based on modified Lotka-Volterra equations. This model shows that the oscillatory behavior in mature technologies' S-curves can also result from symbiotic interaction between two technologies under certain circumstances.

- by James Utterback
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- Economics, Technology, Lotka Volterra, Oriented Strand Board

a b s t r a c t SIPS are formed from the lamination of two oriented strand board (OSB) facing plates and a highly insulating polymer-based foam such as expanded polystyrene (EPS) or polyurethane (PUR). The resulting lightweight panels are typically used as primary load-bearing compression elements for buildings such as domestic dwellings, apartment blocks, schools and hotels.

- by Vadim Silberschmidt
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- Chemical Engineering, Local governance, Oriented Strand Board, Fire safety

This study was carried out to determine the effects of adhesive ratio and pressure time on thickness swelling (TS), internal bond (IB), modulus of rupture (MOR), and modulus of elasticity (MOE) properties of oriented strand board (OSB). For this purpose, 80 mm long strands made of Scots pine (Pinus sylvestris L.) were bonded with phenol-formaldehyde resin at three different ratios (3, 4.5, and 6%) to produce three-layer cross-aligned OSBs. Strands used for the production of OSB panels were made up 40% of core layer and 60% of outer layers. The panels were pressed for three different press times, from 3, 5, to 7 minutes, under 0.4 MPa pressure, aiming for a target density of 0.70 g/cm3. TS, IB, MOR, and MOE properties of OSB panels were evaluated according to the standards (TSE EN 117-319-310). Results showed that MOR and MOE values were changed in the ranges 25.31 to 42.27 N/mm2, and 2848.90 to 6545.63 N/mm2, respectively. Also, the results showed that as adhesive ratio and pressure time increased, the TS, MOR, and MOE values increased too.

- by Gokhan Gunduz
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- Osb, Oriented Strand Board

Kraft lignin phenol formaldehyde resin has certain advantages as a binder in oriented strand board manufacture over the other commercially exterior resins. Since kraft lignin is used as substitute for almost 50% phenol in a typical resin, kraft lignin phenol formaldehyde is not only environmentally friendly but also less expensive as compared to other exterior binders used in wood composite industry. The objective of this study is to evaluate the potential of such resin to produce experimental oriented strandboard panels. Aspen (Populus Euroamericana cv.) was used as raw material to manufacture panels under the laboratory conditions. Bending properties including modulus of elasticity, modulus of rupture, internal bond strength, thickness swelling, and water absorption of the samples were determined. Panels made using two types of resins, namely kraft lignin phenol formaldehyde resin and phenol formaldehyde for the control samples. Average modulus of elasticity and modulus of rupture values of the control samples were determined as 2400 N/mm 2 and 22.03 N/mm 2 , respectively. Corresponding values for the panels produced using kraft based resin were 2539 N/mm 2 and 20.33 N/mm 2 . Based on the initial findings of the study both mechanical and physical properties of the panels were not adversely influenced by modified resin. It appears that kraft lignin phenol formaldehyde resin has some potential for oriented strandboard manufacture. Test results revealed that all properties met the minimum requirements specified in related standards and comparable to those commercially manufactured oriented strandboard panels.

Papan unting merupakan panel kayu yang tersusun atas strand/unting kayu tipis yang diikat bersama menggunakan perekat resin tahan air (waterproof) yang dikempa panas (Yusfiandrita, 1998; Nuryawan, 2007). Papan unting adalah papan tiruan yang terdiri dari 3 lapisan, seperti halnya pada kayu lapis yang dibuat dengan mengikat strand yang tipis atau wafer kayu dalam suatu plat kempa bersuhu tinggi (Ridwan, 1997). Papan unting merupakan papan wafer (waferboard) terbuat dari limbah kayu yang ditemukan ilmuan Amerika pada tahun 1954 (Yusfiandrita, 1998). Saat ini papan wafer sudah dieliminasi dan digantikan oleh papan unting yang termasuk golongan panel kayu struktural bersama kayu lapis. Papan unting merupakan panel kayu untuk penggunaan struktural terbuat dari strand kayu tipis yang diikat bersama perekat resin tahan air (waterproof) (Bowyer, et al, 2003).

- by Arif Nuryawan
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- Oriented Strand Board

Phenol-formaldehyde resins represent an important type of adhesives employed in the production of wood-based panels of superior water resistance (exterior use products). Phenol is a petrochemical product and the increased oil prices together with the need of reducing the demand on fossil fuels and promoting environmentally friendly products have encouraged developments in the use of alternative raw materials derived from

A test procedure to simulate and measure the actual behavior of solid and engineered wood products subjected to realistic cyclic moisture loading conditions was carried out at the Institute for Research in Construction (IRC), National Research Council Canada (NRC). The wetting and drying experiments on oriented strand board (OSB), showed that the rate of moisture absorption and the rate of drying for successive wetting and drying cycles are different from the rates of absorption and drying found on the initial cycle. The OSB samples showed continuous dimensional change in which it was observed that the thickness continued to increase over the test period. It was found that the increase in thickness is a nonlinear function of moisture content and time and the number of cycles. Sample size, board thickness and edge boundary conditions all have significant effect on the response of OSB materials to cyclic moisture changes.

- by Ratnasingam kumaran
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- Oriented Strand Board, Wood Products, Sample Size, Moisture Content

Wood is a very versatile and easily renewable material, characteristics which enable its industrial transformation into high technology composites. Brazil has experienced an increasing use of these composites in furniture and construction industries. The building applications of wood-based structural composites have great range, both for metal and for wooden housing. This research aimed to identify the wooden composites used in Brazil by prefabricated housing producers (in wood and metal), as well as their popularities in relation to the use. To diagnose the use of wood composites were identified: type of composite, location of house producers which use the composites, and available building techniques. OSB and fibrocement boards were the most used composites. This study verified an increasing use of these wooden composites in Brazil, whereas at least 62 companies already use such lignocellulosic raw material in construction.

This paper examines the effect of resin droplet diameter and droplet spacing on the Mode I fracture toughness of a discontinuous Douglas Fir-liquid phenol-formaldehyde bond, using Double Cantilever Beam specimens. The modification of a flexographic printing technique allowed the deposition of droplets of known diameter and spacing onto wood substrates. Experiments showed that the fracture toughness is proportional to the resin droplet diameter, inversely proportional to the droplet spacing, and relatively independent of the amount of resin applied. These findings are in agreement with a developed analytical model. Additionally, the fracture toughness of the discontinuously bonded specimens can equal the fracture toughness of the substrates, despite area coverage of only 50%. r

- by Michael Conrad and +1
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- Materials Engineering, Mechanical Engineering, Chemical Engineering, Oriented Strand Board

Go to AGRIS search. Revista Árvore (2005/08). Umidade de equilíbrio de painéis de madeira. ...

- by Paulo Trugilho and +2
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- Oriented Strand Board, Relative Humidity, Forestry Sciences, High Density Concrete

This work aims to improve the wear resistance of carbide materials by application of PVD hard coatings; chromium and chromium nitride coatings were applied to six types of carbide and their tribological properties were studied. Scratch adhesion strength, micro-abrasion wear resistance and ultra-micro hardness tests of the coatings were held to find a relationship between the tribological properties and the

- by Abdou Djouadi and +1
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- Materials Engineering, Mechanical Engineering, Wear, Oriented Strand Board

Although well known and widely used, tools modified with hard coatings are still not applied to the wood industry. Difficulties come from mechanical, physical and tribological properties of wood and of wood based materials together with particular parameters of their processing. The aim of this study was to synthesise hexagonal and cubic chromium nitride coatings and apply them in wood processing to improve cutting tools' wear resistance. The apparatus used was an industrial type router. The Ž . material subjected to cutting was OSB Oriented Strand Board . The cutting tools with an edge angle of 55Њ were cemented carbide inserts. The coatings were deposited by triode sputtering system; the hexagonal phase was obtained for 10% of nitrogen in the Ar q N mixture used in the discharge, the cubic one was obtained for a percentage higher than 20%. The composition of 2 coatings was determined by EDS and WDS microanalysis and SEM cross-section observations were performed. The mechanical properties of layers were determined by stress measurements and by a wear test performed with in situ method. It reveals that the most resistant coatings are the Cr N films. These optimal conditions of deposition have been applied to cutting tools in 2 routing process. It appears that CrN or Cr N coatings deposited on both tools' faces ameliorate significantly tools wear 2 resistance. ᮊ

- by Abdou Djouadi and +1
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- Materials Engineering, Condensed Matter Physics, Tool wear, Oriented Strand Board

Moisture-originated failures in stucco-clad walls have been reported in the coastal climate of the Canadian Province of British Columbia as well as in the cold climates of Alberta and Minnesota. Damages are often attributed to poor design and water penetration at windows, balconies and walkways. Yet, there is a misconception about moisture control of exterior stucco (rendering) systems. Despite the recent failures, the authors postulate that wood-framed walls with stucco cladding placed on an exterior insulation over oriented strand board (OSB) protected by water-resistive barrier (WRB), and with cellulose fiber insulation within the wall framing can be one of the most economical and ecologically-justified systems that will perform well in most climates. This 3E wall system is designed for energy efficiency, environmental control and ecological responsibility. However, the approach in which building envelopes (BE) are currently designed must be changed. The views presented in this p...

- by M. Bo and +1
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- Environmental Control, Oriented Strand Board, British Columbia, Building Envelope

Price dynamics for North American oriented strand board (OSB) markets are examined. The role of transactions costs are explored vis-à-vis the law of one price. Weekly data, February 3rd, 1995 through October 9th, 2009, are used in the analysis. Nonlinearities induced by unobservable transactions costs are modeled by estimating Time-Varying Smooth Transition Autoregressions (TV-STARs)

- by Jeffrey Prestemon
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- Economic Theory, Applied Economics, Oriented Strand Board, American
- by Michael Harm and +3
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- Engineering, Physical sciences, Statistical Significance, Oriented Strand Board

The objective of this research was to evaluate the effect of bamboo species and resin content on the physical and mechanical properties of oriented strand boards (OSBs) prepared from steam-treated bamboo strands. The strands from three species of Indonesian bamboo, namely Andong (Gigantochloa verticillata), Betung (Dendrocalamus asper), and Ampel (Bambusa vulgaris), were steamed at 126 °C for 1 h at a pressure of 0.14 MPa. Three-layered OSBs with the core layer oriented perpendicularly to the face layers were prepared by bonding them together with 3 to 5% methylene diphenyldiisocyanate (MDI) resin based on oven-dried strands and with the addition of 1% paraffin. The strand compositions for the face, core, and back layers were 25%, 50%, and 25%, respectively. The slenderness ratios and aspect ratios of the strands ranged from 71.02 to 76.60 and from 2.96 to 3.02, respectively. The physical and mechanical properties of the OSBs fabricated from Andong and Betung were better than those from Ampel, and the properties of all OSBs were improved by increasing their resin content. OSBs from Betung with 3 to 5% resin content and those from Andong and Ampel with 4 to 5% resin content showed strength retention of more than 50%, which means they can be used for exterior structural applications. Except for OSBs fabricated from Ampel with 3% resin content, the properties of all OSBs prepared in this study were higher than the minimum values required by the CSA O437.0 (grade O-1) standard (2011).

- by Wahyu Hidayat
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- Biocomposites, Oriented Strand Board, Bamboo Composites

This study examined the formation and growth of secondary organic aerosols (SOA) generated when ozone was added to a 1 m 3 glass chamber that contained either pine shelving, oriented strand board (OSB), beech boards, or beach boards painted with an ''eco'' paint. The experiments were conducted at close to real-world conditions; the chamber was ventilated at w0.5 air changes/h; the loadings (exposed surface of building materials to chamber volume) were in the range of 1-2.5 m 2 m À3 ; and the initial O 3 concentrations were between 15 and 40 ppb. Throughout each experiment particles were measured with both a condensation nuclei counter and an optical counter, while terpenes were measured before and after the ozone exposure period using sorbent tubes. The pine boards emitted primarily a-pinene and 3-carene and lesser amounts of 5 other terpenes;

Oriented strand boards (OSBs) are wood panels that are used worldwide mainly in the packaging and the building sectors. Their market share is rapidly increasing thanks to their outstanding mechanical properties and to a renewed interest for wood based products. The OSB production process generates, nonetheless, emissions of volatile organic compounds (VOCs) during the air-drying of wood strands. This known problem in the literature leads to an odorous nuisance in the surrounding area of the production site. In order to address this problem, a novel application to wood drying of an innovative vapor drying technology is successfully operated at the production site of Kronospan Luxembourg S.A. In addition to the reduced odorous nuisance, a significant environmental added value is expected because of the other modifications induced by the vapor-drying technique on the OSB production process viz. the reduced energy and raw materials demands and the change of adhesive mixture, with the ad...

- by Marko Becker
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- Construction Materials, Ecology, Life Cycle Assessment, Environmental Monitoring

Bamboo has gained increasing attention as an alternative raw material for use in the manufacture of composite boards. Three-layer OSBs were made using Betung bamboo (Dendrocalamus asper (Schultes.f) Backer ex Heyne) strands to evaluate the effects of strand length and pre-treatment techniques on the physical, mechanical, and durability properties. Three different strand lengths, namely 50, 60, and 70 mm, were prepared. Prior to the manufacture into OSB, the strands were immersed in cold water for 24 h and in 6% acetic anhydrides solution for 48 h. The OSBs were fabricated using 5% MDI resin based on the strand dry weight. The results indicated that MOR and MOE values in perpendicular to the grain direction were much influenced by strand length. The dimensional stability of OSB was slightly improved by immersing the strands in acetic anhydride solution. Immersing strands in cold water and acetic anhydride solution improved the resistance of OSB against subterranean termite (Macrotermes gylvus) attack under the adopted experimental condition. All OSB parameters manufactured in this experiment were better than the minimum requirement of CSA 0437.0 (Grade O–2) standard.

- by Wahyu Hidayat
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- Materials Engineering, Plant Biology, Wood Science, Raw materials

This study evaluates the potential use of currently unexploited burnt timber from prescribed burns and wildfires for oriented strandboard (OSB). The research was performed in two phases: in Phase I, the effect of thermal exposure of timber on OSB properties was evaluated. Jack pine (Pinus banksiana) trees variously damaged by a moderately intense prescribed burn in a northern Wisconsin forest were selected. Four fire-damage levels of wood were defined and processed into series of single-layer OSB. The flakes used in Phase I had all char removed. Mechanical and physical properties were evaluated in accordance with ASTM D 1037. Results showed that OSB engineering performance of all four fire-damage levels were similar, and their me chanical properties met the CSA 0437 requirements. In Phase II, we assessed OSB properties from fire-killed, fire-affected and virgin red pine (Pinus resinosa) trees from a central Wisconsin forest exposed to an intense wildfire. The effect of various thermal exposures and varying amounts of char on OSB performance were evaluated. Phase II findings indicate that fire-damage level and bark amount had significant effects on the board properties. Addition of 20 percent charred bark had an adverse effect on bending strength; however, OSB mechanical properties still met the CSA requirements for all fire levels. Conversely, bark addition up to 20 percent was found to improve dimension stability of boards. This study suggests that burnt timber is a promising alternative bio-feedstock for commercial OSB production.

- by Laura Moya
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- Prescribed Fire, Raw materials, United States, Oriented Strand Board

Este trabalho objetivou avaliar a viabilidade técnica de utilização das madeiras de Eucalyptus grandis W. Hill ex Maiden e de cipreste (Cupressus glauca Lam.) na fabricação de chapas de partículas orientadas (OSB). Chapas de três camadas, na proporção de 1:2:1 e massa específica aparente nominal de 0,75 g/cm³ foram confeccionadas com 5% e 8% de resina uréia-formaldeído (UF) e fenol-formaldeído (FF), baseado no peso seco de partículas. As propriedades das chapas foram determinadas de acordo com a norma ASTM D 1037 e os resultados comparados com as especificações da norma canadense CSA O437. Com relação às chapas OSB de eucalipto todas as propriedades mecânicas foram superiores ao mínimo exigido pela CSA O437, para a classe O-2, com exceção do módulo de ruptura, na direção paralela, usando a resina UF. Em termos de propriedades mecânicas as chapas OSB de cipreste foram superiores às chapas OSB de eucalipto e também superaram todos os valores especificados pela norma canadense. Todas as chapas apresentaram baixa estabilidade dimensional e não atenderam o valor máximo de inchamento em espessura, após 24 h de imersão, requerido pela norma CSA O437, classe O-2. Dentre todos os tratamentos testados aquele de melhor desempenho foi o de 8% de resina fenol-formaldeído. As madeiras de eucalipto e de cipreste mostraram-se viáveis como matéria-prima para a confecção de chapas OSB.

- by Mario Souza
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- Raw materials, Oriented Strand Board, Physical Properties, Urea Formaldehyde

A simplified equation relating water droplet size distribution to crystallization temperature, determined from differential scanning calorimetry (DSC) curves of aqueous emulsions of petroleum is reported in this article. A series of water-in-oil (W/O) emulsions was prepared by dispersion of water in different Mexican crude oils; in a classical DSC experiment, these emulsions were submitted to a regular heating and cooling cycle within temperatures including freezing and heating of dispersed water. The Z-average diameters of the water drops (D dz ) were estimated this way and correlated with petroleum composition.

- by Donatien Pascal Kamdem
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- Engineering, Materials Engineering, Neuroscience, Cognitive Science

We assess exchange rate pass–through (ERPT) for U.S. and Canadian prices for oriented strand board (OSB), a wood panel product used extensively in U.S. residential construction. Because of its prominence in construction and international trade, OSB markets are likely sensitive to general economic conditions. In keeping with recent research (e.g., Al-Abri and Goodwin, 2009; Larue et al., 2010), we examine regime–specific ERPT effects; we use a smooth transition vector error correction model. We also build on work by Nogueira, Jr. and Leon-Ledesma (2011) and Chew et al. (2011) in considering ERPT asymmetries associated with a measure of general macroeconomic activity. Our results indicate that during expansionary periods ERPT is modest, at least initially, but during the recent financial crises ERPT effects were quite large.

- by Fauzi Oetih Rahman
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- Materials Engineering, Plant Biology, Wood Science, Raw materials

Giant timber bamboos, such as moso (Phyllostachys pubescens) and guadua (Guadua angustifolia) are potentially well-suited to the production of engineered strand-based structural composite building materials. There is no information available for guadua, but moso bamboo is known to produce good-quality, strand-based composites. However, economically viable commercial production of these composites is hindered by the lack of an efficient, automated method for converting culm stock to strands, and very little technical information is available regarding strand production and quality. In this study, moso and guadua culm characteristics and tissue re-saturation behavior likely to affect stranding were measured and compared. Strand size classification and the thickness and width distributions from stranding resaturated moso and guadua quartered culm pieces using a CAE 6/36 single-blade disk flaker were determined. While node frequency was lower in guadua than in moso, the diaphragms and embedded wall tissue were much thicker and tougher, with strong negative effects on strand quality. When cut to a target thickness of 0.65 mm, moso bamboo produced strand thickness frequency distributions close to those found in sampled mill strands of trembling aspen, while guadua caused high wear on blades and yielded a greater proportion of excessively thick, broken, and very rough strands.

- by kate semple
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- Processing, Oriented Strand Board, Bioresources

The objective of this research was to evaluate the effect of bamboo species and resin content on the physical and mechanical properties of oriented strand boards (OSBs) prepared from steam-treated bamboo strands. The strands from three species of Indonesian bamboo, namely Andong (Gigantochloa verticillata), Betung (Dendrocalamus asper), and Ampel (Bambusa vulgaris), were steamed at 126 °C for 1 h at a pressure of 0.14 MPa. Three-layered OSBs with the core layer oriented perpendicularly to the face layers were prepared by bonding them together with 3 to 5% methylene diphenyldiisocyanate (MDI) resin based on ovendried strands and with the addition of 1% paraffin. The strand compositions for the face, core, and back layers were 25%, 50%, and 25%, respectively. The slenderness ratios and aspect ratios of the strands ranged from 71.02 to 76.60 and from 2.96 to 3.02, respectively. The physical and mechanical properties of the OSBs fabricated from Andong and Betung were better than those from Ampel, and the properties of all OSBs were improved by increasing their resin content. OSBs from Betung with 3 to 5% resin content and those from Andong and Ampel with 4 to 5% resin content showed strength retention of more than 50%, which means they can be used for exterior structural applications. Except for OSBs fabricated from Ampel with 3% resin content, the properties of all OSBs prepared in this study were higher than the minimum values required by the CSA O437.0 (grade O-1) standard (2011).

- by Wahyu Hidayat
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- Biocomposites, Oriented Strand Board, Bamboo Composites, Bioresources

This article extends the recent literature on the Prebisch-Singer hypothesis of a long-run decline in the relative prices of primary commodities. Our main innovation is testing for and estimating nonlinear alternatives to a secular deterioration. Specifically, we use bootstrap procedures to test the linear unit root model against models belonging to the family of smooth transition autoregressions (STARs) for twenty-four commodities, 1900-2003. In nineteen cases we reject the linear null at usual significance levels. In sixteen cases we are able to successfully fit STAR-type models. Simulation results show there is little support for the Prebisch-Singer hypothesis.

- by Matthew Holt
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- Applied Economics, Oriented Strand Board, Terms of Trade, Unit Root
- by Gerhard Sinn and +2
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- Engineering, Physical sciences, Statistical Significance, Oriented Strand Board

Ž . Cubic CrN 200 and a mixture of 25% CrNq 75% Cr N 111 coatings were deposited by magnetron sputtering onto carbide 2 Ž . tools and tested in wood machining. The composition of the layers was determined by X-ray photoelectron spectroscopy XPS Ž . analyses. Scanning electron microscopy SEM observations showed that Cr N layers have a columnar structure while CrN layers 2 Ž . seem to be featureless. Secondary ion mass spectroscopy SIMS profiles have shown a good homogeneity of the layers and no interdiffusion of the different species into the substrate. The mechanical properties of the chromium nitride coatings were characterized by residual stress measurement, hardness measurements and scratch adhesion tests. The layers have some compressive stresses in the range y1.7ry2.1 GPa and y0.4ry1 GPa for CrN and Cr N, respectively. The more adherent 2 Ž . layers are CrN ones which exhibit hardness up to 1900᎐2100 HV. Cr N layers are harder up to 1900᎐2100 HV but less 2 adherent. Machining tests were performed up to 5 and 10 km of cutting distance with industrial routers on Oriented Strand Board. Tool wear and service life were compared between the uncoated and coated tools. First, it has been observed that the edge wear is very high, just at the beginning of the routing process. The best result was shown by a carbide tool CrN coated on both faces; the service life of this tool is four times higher than the one of an uncoated tool. ᮊ

- by Abdou Djouadi and +1
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- Materials Engineering, Condensed Matter Physics, Scanning Electron Microscopy, Tool wear

A 3D numerical model was developed to investigate the effect of foil emissivity on the effective thermal resistance of an above-grade wall assembly with foil bonded to wood fibreboard in a furred assembly having airspace next to the foil. This model solved simultaneously the energy equation in the various material layers, the surface-to-surface radiation equation in the furred airspace assembly, NaviereStokes equation for the airspace, and Darcy and the Brinkman equations for the porous material layers. In this work, the furring was installed horizontally. In the first phase, the present model was benchmarked against the experimental data generated by a commercial laboratory for an above-grade wall assembly. The wall consists of a conventional wood frame structure sheathed with fibreboard and covered on the interior side with a low emissivity material bonded to wood fibreboard that is adjacent to a furred airspace assembly. The results showed that the predicted R-value was in good agreement with the measured one. After gaining confidence in the present model, it was used to predict the effective thermal resistance of the same above-mentioned wall but having Oriented Strand Board (OSB) sheathing in lieu of wood fibreboard sheathing. In the second phase, the model was used to quantify the contribution on the wall R-value by having a low foil emissivity. The results showed that a low foil emissivity of 0.04 can increase the R-value of this wall to as much as w9%. This is on-going research. The present model is being used to investigate the transient thermal response of foundation wall systems with furring installed horizontally and vertically, and subjected to different Canadian climate conditions. Crown

- by Wahid Maref
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- Architecture, Heat Transfer, Building, Oriented Strand Board

- by Laura Moya
- •
- Prescribed Fire, Raw materials, United States, Oriented Strand Board

This research aimed at studing the effects of panels density (0.65 and 0.80 g/cm 3), face to core ratios (1:1:1 and 1:3:1) and resin content (4% and 6%) on the properties of OSB panels. It was concluded that the OSB panels present better... more

- by Jorge Luis Monteiro Matos
- •
- Oriented Strand Board

The objective of this research was to evaluate the effect of bamboo species and resin content on the physical and mechanical properties of oriented strand boards (OSBs) prepared from steam-treated bamboo strands. The strands from three species of Indonesian bamboo, namely Andong (Gigantochloa verticillata), Betung (Dendrocalamus asper), and Ampel (Bambusa vulgaris), were steamed at 126 °C for 1 h at a pressure of 0.14 MPa. Three-layered OSBs with the core layer oriented perpendicularly to the face layers were prepared by bonding them together with 3 to 5% methylene diphenyldiisocyanate (MDI) resin based on ovendried strands and with the addition of 1% paraffin. The strand compositions for the face, core, and back layers were 25%, 50%, and 25%, respectively. The slenderness ratios and aspect ratios of the strands ranged from 71.02 to 76.60 and from 2.96 to 3.02, respectively. The physical and mechanical properties of the OSBs fabricated from Andong and Betung were better than those from Ampel, and the properties of all OSBs were improved by increasing their resin content. OSBs from Betung with 3 to 5% resin content and those from Andong and Ampel with 4 to 5% resin content showed strength retention of more than 50%, which means they can be used for exterior structural applications. Except for OSBs fabricated from Ampel with 3% resin content, the properties of all OSBs prepared in this study were higher than the minimum values required by the CSA O437.0 (grade O-1) standard (2011).

- by Wahyu Hidayat
- •
- Biocomposites, Oriented Strand Board, Bamboo Composites, Bioresources

In late 2000, a fax survey was sent to 1,867 manufacturers of wood office furniture and doors in an attempt to gauge the market po- tential for oriented strandboard (OSB) products in these two key industrial segments. It is hoped that this research will form the basis of marketing strategies aimed at increasing OSB use in various industrial market segments. In general, while both markets appear to be attractive for panel producers, OSB manufacturers would likely stand a better chance of market acceptance in the office furniture sector, perhaps positioning themselves as a lower-end product. This study also provides OSB manufacturers with recommendations for improving their product's market position within these highly competitive marketplaces. This may prove challenging since the de- gree of familiarity, acceptance, and use of OSB products among both office furniture and door manufacturers is low compared to other types of wood products. Most respondents claim that OSB products ...

- by Robert Kozak
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- Marketing Strategy, Market Segmentation, Wood, Oriented Strand Board

In late 2000, a fax survey was sent to 1,867 manufacturers of wood office furniture and doors in an attempt to gauge the market potential for oriented strandboard (OSB) products in these two key industrial segments. It is hoped that this research will form the basis of marketing strategies aimed at increasing OSB use in various industrial market segments. In general, while both markets appear to be attractive for panel producers, OSB manufacturers would likely stand a better chance of market acceptance in the office furniture sector, perhaps positioning themselves as a lower-end product. This study also provides OSB manufacturers with recommendations for improving their product's market position within these highly competitive marketplaces. This may prove challenging since the degree of familiarity, acceptance, and use of OSB products among both office furniture and door manufacturers is low compared to other types of wood products. Most respondents claim that OSB products will require many technical improvements in order to successfully penetrate the industrial marketplace. That said, the most effective means of disseminating product information to industrial manufacturers about a product like OSB is through direct and personal communication tactics.

- by Chris Gaston
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- Marketing Strategy, Market Segmentation, Wood, Oriented Strand Board

The purpose of this study was to develop speciality oriented strand board (OSB) with high stiffness for use in products such as engineered wood flooring (EWF). Three-layer oriented strand boards were manufactured from two feedstocks of strands: a mixture of 90% aspen (Populus tremuloides) and 10% of paper birch (Betula papyrifera), and 100% of small diameter ponderosa pine logs (Pinus ponderosa). The OSB panels were manufactured under a factorial design of three resin contents, two density profiles, and three weight ratios for the face and core layers. Tests to determine density, bending modulus of elasticity (MOE), internal bond (IB) and thickness swelling (TS) were performed according to ASTM standard D 1037-06a. The results showed that the higher values of bending MOE for panels made from aspen/birch mixture and ponderosa pine, 8190 and 9050 MPa, respectively, were obtained for the same combination of factors. Such high bending MOE values are very close to Baltic birch (Betula pendula) plywood, a product known for its high stiffness. The effect of resin content on IB is more pronounced for panels made from ponderosa pine than panels made from the aspen/birch mix

- by Vikram Yadama
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- Building, Factorial Design, Oriented Strand Board, Forestry Sciences

The emissions of volatile organic compounds (VOCs) from structural insulated panel (SIP) materials were investigated. Specimens of newly produced SIPs and associated panel adhesives were obtained from two relatively large manufacturers. Additionally, specimens of the oriented strand board (OSB) used as the inner and outer sheathing and the extruded polystyrene core for the SIP were obtained from one manufacturer. Using small-scale chambers, emissions of formaldehyde, acetaldehyde, acetic acid and other VOCs from SIPs, OSB and polystyrene were measured over a period of four months and from the adhesives over two months. SIP specimens overlaid by gypsum board panels were also tested over four months. The predominant VOCs emitted by the SIPs included acetic acid, pentanal, hexanal and styrene. The emissions of formaldehyde and acetaldehyde were relatively low. Acetic acid and the aldehydes derived from the OSB, while styrene derived from the polystyrene. One of the SIPs emitted toluene and methyl acetate. The adhesives primarily emitted a mixture of hydrocarbons. The emission rates of most VOCs from the SIP/gypsum board assemblies were approximately the same or higher than their respective emission rates from the unfinished SIPs.

- by Alfred Hodgson
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- Air Quality, Indoor Air Quality, Oriented Strand Board, Field Study

The objective of this research was to evaluate the technical feasibility of the use of Eucalyptus grandis W. Hill ex Maiden and Cupressus glauca Lam. wood to manufacture oriented strand boards (OSB). Boards of three layers with the ratio of 1:2:1 were bonded with 5% and 8% of urea- (UF) and phenol-formaldehyde (FF) resins, based on dry weight of particles

- by Divino E Teixeira
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- Raw materials, Oriented Strand Board, Physical Properties, Urea Formaldehyde

This study evaluated physical, mechanical and fire properties of oriented strand boards (OSB) covered with fire retardant treated veneers. The beech (Fagus orientalis Lipsky) veneers were treated with either monoammonium phosphate, diammonium phosphate, lime water or a borax/boric acid (1:1 by weight) mixture. Physical and mechanical properties of the specimens were performed according to EN and DIN standards. A cone calorimeter was used to determine their combustion characteristics. The physical and mechanical properties of the specimens were adversely affected by the treatments. The specimens treated with lime water had the best physical performance while the specimens treated with borax/boric acid had the highest mechanical properties. The fire retardant treatments of the face veneers were effective in reducing the initial contribution of heat release to potential fire growth. In particular, the lime water treatment was an effective fire retardant treatment in that it reduced both the effective heat of combustion and the mass loss rate. It also delayed the times for sustained ignition. In dieser Studie wurden die physikalischen und mechanischen sowie die Brandeigenschaften von OSB mit Feuerschutzmittel imprägnierten Deckfurnieren untersucht. Die Buchenfurniere (Fagus orientalis Lipsky) wurden entweder mit Monoammoniumphosphat, Diammoniumphosphat, Kalkwasser oder einer Borax/Borsäure-Mischung (im Gewichtsverhältnis 1:1) imprägniert. Physikalische und mechanische Eigenschaften der Proben wurden nach EN- und DIN-Normen untersucht. Das Brandverhalten wurde mittels einer Cone-Calorimeter-Prüfung bestimmt. Die Imprägnierung wirkte sich auf die physikalischen und mechanischen Eigenschaften der Proben nachteilig aus. Die mit Kalkwasser imprägnierten Proben wiesen die besten physikalischen Eigenschaften auf, wohingegen die mit Borax/Borsäure imprägnierten Proben die besten mechanischen Eigenschaften hatten. Durch die Feuer hemmende Behandlung der Deckfurniere wurde die Wärmefreisetzung verzögert. Dabei erwies sich die Imprägnierung mit Kalkwasser als besonders wirksam, da sie sowohl die Gesamtwärmefreisetzung als auch die Masseverlustrate reduzierte. Daneben verzögerte sie auch den Entzündungszeitpunkt.

- by Zeki Candan
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- Water Treatment, Building, Oriented Strand Board, Forestry Sciences

- by Wahyu Hidayat
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- Materials Engineering, Plant Biology, Wood Science, Raw materials

- by wahyu hidayat
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- Materials Engineering, Plant Biology, Wood Science, Raw materials

This study evaluated surface characteristics and overlaying properties of wood plastic composite (WPC) panels made from dry-blended rubber wood fiber-polypropylene (PP) powder formulations using a conventional flat-press process under laboratory conditions. Three levels of rubberwood fibers (Hevea brasiliensis), 40%, 50%, and 60%, based on the composition by weight, were mixed with the PP powder without and with 3% (based on weight) maleic anhydride grafted PP (MAPP) as a coupling agent. Contact angle measurements on the WPC samples were performed using a goniometer connected with a digital camera which collected one image per second. Roughness measurements, average roughness (R a ), mean peak-to-valley height (R z ), and maximum roughness (R y ), were taken from the sanded samples along and across the sandmarks using a fine stylus tracing technique. With increasing polymer content, surface roughness of the WPC panels improved while their wettability and adhesive bonding strength decreased. The formulations without MAPP were found to have higher surface roughness but they also had better wettability. Wettability and surface roughness of the WPC panels can provide good information on their ability to bond.

- by Nadir Ayrilmis
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- Water Treatment, Building, Oriented Strand Board, Forestry Sciences

- by M. Bo and +1
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- Oriented Strand Board, Water vapour
- by Stephen Shaler
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- Engineering, Wood Science, Statistical Process Control, Populus
- by Jane Pritchard
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- Materials Engineering, Materials Science, Plant Biology, Creep

- by Shri Ramaswamy
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- Prescribed Fire, Raw materials, United States, Oriented Strand Board

A numerical model based on the finite element method is presented for prediction of the cyclic response of wood frame structures. The model predicts the cyclic response of shear walls. Nonlinear phenomena are assumed to be concentrated in the connections that are modelled through elements linking the structural elements including the posts, beams, and sheathing panels. Identification of model parameters relies on tests on individual connections.

- by Nicolas RICHARD
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- Civil Engineering, Finite element method, Finite Element, Fracture Mechanics