Scielo RSS <![CDATA[Maderas. Ciencia y tecnología]]> http://www.scielo.cl/rss.php?pid=0718-221X20170050&lang=es vol. num. AHEAD lang. es <![CDATA[SciELO Logo]]> http://www.scielo.cl/img/en/fbpelogp.gif http://www.scielo.cl <![CDATA[Optimization of sanding parameters using response surface methodology]]> http://www.scielo.cl/scielo.php?script=sci_arttext&pid=S0718-221X2017005000101&lng=es&nrm=iso&tlng=es Abstract: The main objective of this work is to develop a mathematical model to evaluate optimum sanding conditions of Europen black pine (Pinus nigra). Samples were sanded using different of grit size, feed rate, cutting speed and depth of cut. Average surface roughness ( Ra ) values of each type of specimens were measured employing a stylus type of equipment. Interaction between sanding parameters and surface roughness of the species were analyzed using Minitab software and response surface methodology. Based on the findings in the work feed rate, cutting speed, grit size and depth of cut values of 5,39 m/min, 19,75 m/sec, 220 P and 9 mm were determined as optimum sanding conditions. <![CDATA[Toxic effects of three selected Malaysian timbers plant extracts against subterranean termites]]> http://www.scielo.cl/scielo.php?script=sci_arttext&pid=S0718-221X2017005000201&lng=es&nrm=iso&tlng=es Abstract: The toxic effects of selected Malaysian timbers (Madhuca utilis, Anisoptera laevis and Endospermum malaccense) heartwood extracts were studied with the aim to determine and understanding the function of wood extracts as a natural protection against termite. The results show that no-choice experiments revealed toxic properties of all investigated extracts by the contact against Coptotermes gestroi and Coptotermes curvignathus. However, high termite mortality was only achieved with Madhuca utilis extracts and methanol solvents. <![CDATA[Mechanical, dynamic mechanical and morphological properties of composites based on recycled polystyrene filled with wood flour wastes]]> http://www.scielo.cl/scielo.php?script=sci_arttext&pid=S0718-221X2017005000301&lng=es&nrm=iso&tlng=es Abstract: In this work, the potential for usage recycled polystyrene and wood flour wastes as materials for development wood plastic composites was evaluated. The effects of wood flour loading and coupling agent addition on the mechanical, dynamic mechanical and morphological properties of polystyrene wood flour composites were examined. The results showed that the mechanical properties decreased with the wood flour loading. However, an improvement in composite compatibility was observed when the coupling agent was used resulting in the increase of mechanical and dynamic mechanical properties. A morphological study demonstrates the positive effect in the interfacial adhesion between filler and matrix caused by the coupling agent addition. Based on the findings of this work, both waste materials can be used for development composites with higher performance. <![CDATA[Valorization of <em>Cistus ladanifer</em> and <em>Erica arborea</em> shrubs for fuel: Wood and bark thermal characterization]]> http://www.scielo.cl/scielo.php?script=sci_arttext&pid=S0718-221X2017005000401&lng=es&nrm=iso&tlng=es Abstract: As a form of upgraded biomass characterized by its high energy density, low production costs, and low process energy requirements, wood pellets are an environmentally friendly fuel allowing for carbon neutral heating with high energy efficiency. In this work, the suitability of a valorization of the woods from the two most representative shrub species from the Iberian Peninsula (namely Cistus ladanifer and Erica arborea) for heating has been assessed. Whereas Erica arborea met the requirements of ISO 17225-2:2014 for ENplus-B class (the calorific content for both wood and bark was high and not significantly different, and the ash content was permissible for specimens with branch diameter ≥2,8 cm), Cistus ladanifer was in the limit of the normative and only met the requirements in terms of acceptable ash percentage (1,9%) and heating value (19 kJ·g-1) for old specimens with branch diameters &gt;3,4 cm. Consequently, while the harvest of E. arborea for its use as fuel does not need to be selective, that of C. ladanifer should be limited to the most robust specimens and foliage should be avoided.