Maderas. Ciencia y Tecnología 2018-12-28T02:11:08-03:00 Ruben A. Ananias. Open Journal Systems <p>&nbsp;</p> <p>&nbsp;</p> <table style="margin-top: -250px; width: 1025px; height: 672px;"> <tbody> <tr> <td style="width: 30%;"><strong><span style="color: #ffffff; text-align: center;"><img src="/public/site/images/visepul/cover_21(1)6.png"></span></strong></td> <td style="width: 30%;"> <p><img style="width: 30px;" src="" alt=""> <a href="">Full Text PDF</a><br> <img style="width: 30px;" src="" alt=""> e-book version<br> <a href=""><img style="width: 30px;" src="" alt=""></a> mobile version</p> </td> <td style="width: 30%;"> <p>Editor-in-Chief: <a href="" target="_self">Rubén A. Ananias</a><span id="result_box" class="short_text" lang="en"><br>Technical Editor</span>: <a href="">Linette Salvo S.<br></a>Digital Manager: <a href="">Victor Sepúlveda V.</a><br>E-mail :<a href=""></a><br>E-mail :<a href=""></a><br><br>2017 Journal Impact Factors:<br> 2-years: 1.014<br>5-years: 1.118<br> Frequency: 4 issues by year.<br>ISSN 0718-221X online version.<br>ISSN 0717-3644 printed version.</p> </td> </tr> </tbody> </table> Characterization of pacific silver fir impregnated with extractives from western redcedar 2018-11-19T04:44:43-03:00 Rod Stirling Stacey Kus <p>Alternative and higher value uses are needed for residual materials generated from wood products processing. Western redcedar sawdust contains an array of unique chemicals and has the potential to be used to alter the appearance, stability and durability of non-durable timbers. Here it was hypothesized that impregnation of Western redcedar heartwood extractives into Pacific silver fir would decrease shrinkage, hygroscopicity, and susceptibility to decay. Western redcedar hot water extracts were obtained from sawdust and used to pressure-treat Pacific silver fir blocks. Extractive impregnation enhanced the wood’s appearance and gave it a more cedar-like brown colour. Impregnated samples had reduced shrinkage, but were not as dimensionally stable as Western redcedar heartwood. Pacific silver fir blocks impregnated with water-soluble extractives were also highly susceptible to leaching, and leached samples had similar shrinkage values to untreated controls. In contrast, leaching had little effect on the hygroscopicity of the Western redcedar heartwood. Extractive-impregnated Pacific silver fir blocks had increased resistance to decay by two brown-rot fungi, and showed resistance similar to that of Western redcedar heartwood. However, leached blocks did not have the same decay resistance.</p> 2018-11-19T00:00:00-03:00 ##submission.copyrightStatement## Energy valorization of woody biomass by torrefaction treatment: a brazilian experimental study 2018-12-12T03:29:14-03:00 Clarissa Gusmão Figueiró Benedito Rocha Vital Angélica de Cássia Oliveira Carneiro Carlos Miguel Simões da Silva Mateus Alves Magalhães Lucas de Freitas Fialho <p>Brazilian productivity of eucalyptus trees is one of the highest in the world, and it has sustainable and viable conditions to supply the demand for woody biomass in a large quantity and diversity. This favorable situation makes Brazil one of the countries with the greatest potential for the production development of torrefied woody biomass on a commercial scale. Torrefaction is a mild pyrolysis applied to increase the energy quality of the feedstock. The aim of this study was to evaluate the Brazilian potential of woody biomass torrefaction for energy purposes. An experimental study was performed evaluating this thermal treatment of eucalyptus wood chips on a semi-continuous screw reactor developed by a Brazilian university. The results showed the increases in the energy quality of eucalyptus wood chips as a function of torrefaction temperature and time. This thermal treatment was technically feasible for the hygroscopicity reduction and the increases of fixed carbon and calorific values of the woody biomass.</p> 2018-11-19T00:00:00-03:00 ##submission.copyrightStatement## Analysis of wood products from an added value perspective: The uruguayan forestry case 2018-12-12T03:34:41-03:00 Andrés Dieste María Noel Cabrera Leonardo Clavijo Norberto Cassella <p>Uruguay has a forest resource of 1 million ha plantation of fast-growing eucalyptus and pine. Short-fiber pulp is the country second export product in value, but there is also a significant production of plywood and graded kiln-dried timber from both species, used mainly for appearance applications. However, the value chain of the wood industry is not yet fully developed, particularly for pine. This study classified different existing and potential wood products using added value as criteria, calculated at the industry level by adopting a system of inputs and outputs. Hypothetical plants to manufacture these products were technical and economically analyzed: thermally modified timber, cross laminated timber, laminated veneer lumber, pine timber, bleached Eucalyptus kraft pulp, pine bleached chemical thermo-mechanical, medium density fiberboards, oriented strand board and a power plant fueled with forest biomass. The data used for this study was obtained from the final project of undergraduate engineer students of the Faculty of Engineering, Universidad de la República, Uruguay, except for the eucalyptus pulp mill, which was proposed by the authors. The results showed that wood products obtained from logs that are the main objective of the plantation presented a higher added value than those manufactured from forest residues, thinnings or chips from the sawmilling industry<strong>. </strong>Solid wood products for appearance or structural applications are at the top of added value list, considering value added per product, unit of biomass or unit of forest land per year. The integration of the value chain of the products analyzed, linking solid wood products with panels or pulp, has the potential to boost the addition of value of the forest biomass in Uruguay.</p> 2018-11-19T00:00:00-03:00 ##submission.copyrightStatement## Layer thickness performances of coatings on MDF: Polyurethane and cellulosic paints 2018-12-24T16:43:27-03:00 Emine Seda Erdinler Kucuk Huseyin Koc Tuncer Dilik Ender Hazir <p>Furniture from wood material is exposed to various external effects. Impact has negative influence on these materials. Surface treatment is effective on wood material’s durability. This may change due to layers of paint and the property of the paint used on the material. The aim of this study is to determine the differences by investigating the deformations occurring on Medium Density Fiberboard (MDF) with various surface treatments due to impact. Determination of the deformation values were performed by pendulum hardness test and rapid deformation test on MDF using polyurethane and cellulosic paints with different number of application layers. Impact tester was used for determining the effect of rapidly deforming sudden impacts. Pendulum hardness tester was used to determine the layer hardness of the surfaces. Statistical assessment was performed for determining and revealing the impacts. As result of the study, paint type, layer thickness and the interaction between them were significant. Highest layer hardness values for cellulosic paint application type 1 and polyurethane paint type 2 were 241.667 sec. and 222.133 sec. respectively. According to rapid deformation test it was determined that polyurethane paint application had better results than cellulosic paint application.</p> 2018-11-19T00:00:00-03:00 ##submission.copyrightStatement## Relación entre parámetros de producción y propiedades estructurales de madera laminada encolada de Eucalyptus grandis 2018-12-24T16:54:28-03:00 Laura Moya Carolina Pérez Gomar Abel Vega Alicia Sánchez Ignacio Torino Vanesa Baño <p>La oferta actual de maderas uruguayas ha incentivado la producción de vigas de madera laminada encolada sin adaptar la tecnología original destinada a elementos de carpintería. La inexistencia de normativa sobre requisitos de fabricación permite producir y comercializar componentes que siendo no estructurales, son consumidos como tales por usuarios desconocedores de las características del producto. El objetivo del trabajo fue establecer la relación entre los parámetros de fabricación de madera laminada encolada de Eucalyptus grandis y sus propiedades estructurales, adaptando la tecnología en Uruguay. La metodología involucró modificar los parámetros de producción de una empresa y ejecutar ensayos de caracterización. Los parámetros adoptados incluyeron: adhesivo poliuretánico; diente estructural de longitud 15 mm; presión de ensamble de 10 MPa y de 1,2 MPa en uniones dentadas y vigas respectivamente; y control de tiempos de prensado en láminas y vigas. Los resultados de los ensayos mecánicos y de integridad de encolado indicaron que fue posible fabricar madera laminada estructural. Las propiedades de flexión y densidad de las vigas se correspondieron con las respectivas de la clase resistente GL24h de la norma europea EN 14080. Estos resultados contribuyen a la redacción de una norma uruguaya de madera laminada encolada estructural de Eucalyptus grandis.&nbsp;</p> 2018-11-19T00:00:00-03:00 ##submission.copyrightStatement## Effect of brown rot degradation on mass loss and compressive strength of chinese poplar (Populus simonii) 2018-12-26T13:21:23-03:00 Huadong Xu Yanan Di Jed Cappellazzi Jeffrey J. Morrell <p>The wood of poplar species are generally perceived as susceptible to decay, however, poplar is still widely used as columns in traditional Chinese buildings. Understanding how decay affects the compressive properties of this material will help engineers better assess wood condition during routine inspection and maintenance. The effects of decay on compressive properties of Chinese poplar were explored using a brown rot decay fungus (<em>Gloeophyllum trabeum</em>). Changes in compression strength were fairly linear and more closely correlated with mass loss (<em>R</em><sup>2</sup>= 0.75). The results suggest that residual compressive strength could be roughly predicted using wood density as a surrogate measure.</p> 2018-11-19T00:00:00-03:00 ##submission.copyrightStatement## A new approach to wood protection: Preliminary study of biologically synthesized copper oxide nanoparticle formulation as an environmental friendly wood protectant against decay fungi and termites 2018-12-28T02:11:08-03:00 K. S. Shiny R. Sundararaj N. Mamatha B. Lingappa <p>Nanoparticles have addressed many challenges in science and technology and wood science research is one such field that has benefitted from application of metal nanoparticles. The metal nanoparticles that are commercially available for wood protection are synthesised by physical and chemical methods which produces toxic by-products and are expensive. The current study deals with a new approach for utilization of metal nanoparticle for wood protection in an ecofriendly and cost effective way. Metal nanoparticles were synthesised using plant extracts that are known to have wood preservative properties. The synergistic effects of the intrinsic property of plant extracts along with the biocidal property of metal nanoparticles were utilized. Copper oxide nanoparticles were synthesised using leaf extracts of Neem (<em>Azadirachta indica</em>), Pongamia (<em>Pongamia pinnata</em>), Lantana <em>(Lantana camara</em>) and extract of orange peel (<em>Citrus reticulata</em>). The effectiveness of the synthesised plant extract and copper oxide nanoparticle formulation is tested against wood decay fungi using agar mixed with the test substance. &nbsp;Graveyard test is employed to assess the effect of the copper oxide nanoparticle formulation against termites. Preliminary results are promising and studies are progressing to develop a stable and environmentally benign wood preservative formulation of metal nanoparticles and plant extracts.</p> 2018-11-19T00:00:00-03:00 ##submission.copyrightStatement##