Maderas-Cienc Tecnol 2020-10-01T00:00:00-03:00 Ruben A. Ananias. Open Journal Systems <table> <tbody> <tr> <td style="width: 30%;"><strong><span style="color: #ffffff; text-align: center;"><img src="/public/site/images/visepul/3d-22(3).png"></span></strong></td> <td style="width: 30%;"> <div class="issueCoverDescription"> <div class="description"> <p><img style="width: 30px;" src="" alt=""> <a href="">Full Text PDF</a></p> <p><img style="width: 30px;" src="" alt=""> e-book version</p> <p><a href=""><img style="width: 30px;" src="" alt=""></a> mobile version</p> <p><img style="width: 30px;" src="" alt="">&nbsp; <a href=";pid=0718-221X20200050&amp;lng=es&amp;nrm=iso">XML</a></p> </div> </div> </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>2019 Journal Impact Factors:<br> 2-years: 1.2<br>5-years: 1.3<br> Frequency: 4 issues by year.<br>January, April, July, October<br>ISSN 0718-221X online version.<br>ISSN 0717-3644 printed version.</p> </td> </tr> </tbody> </table> Variability in the physico-chemical properties of wood from Eucalyptus robusta depending on ecological growing conditions and forestry practices: The case of smallholdings in the Highlands of Madagascar 2020-05-22T16:55:31-04:00 Zo Elia Mevanarivo Tahiana Ramananantoandro Mario Tomazello Filho Alfredo Napoli Andriambelo Radonirina Razafimahatratra Herintsitohaina Ramarson Razakamanarivo Gilles Chaix <p>This study set out to determine which environmental factors of growth and silvicultural practices can affect the properties of <em>Eucalyptus robusta</em> coppice wood and also to study variability in those properties depending on the factors. Hundred and thirty-five coppice logs aged 2 to 10 years were collected from five zones in the Highlands of Madagascar. Wood density at 12% moisture content was measured by X-ray microdensitometry. Chemical properties, such as the total extractives, Klason lignin and holocellulose contents were predicted using near infrared spectrometry prediction models. The results significantly showed (p-value&lt;0.001) that wood density (0.543 – 0.836<sup>-3</sup>), total extractives (3.1 – 9.8%) and Klason lignin content (24.6 – 35.3%) increased with age, with the</p> <p>opposite occurring for holocellulose (63.8 – 69.9%). Wood density also varied significantly (p-value&lt;0.001) depending on the zones, which was not the case for chemical properties. The densest woods were found at the hottest zones with less acid soils. Woods were less dense in zones, characterized by high rainfall and a soil rich in nitrogen and organic carbon. The plantation spacing, elevation of the zone and soil texture did not significantly affect wood properties.</p> 2020-10-01T00:00:00-03:00 ##submission.copyrightStatement## Hydrothermal treatments to promote surface inactivation and increased flexibility in three hardwoods 2020-05-22T17:00:32-04:00 Matheus Lemos de Peres Rafael de Avila Delucis Rafael Beltrame Darci Alberto Gatto <p>In the present study, three juvenile hardwoods (namely sycamore, pecan and london plane) were treated by boiling, steaming and microwave. Trees from <em>Platanus</em> x <em>acerifolia</em> (sycamore), <em>Carya illinoinensis</em> (pecan) and <em>Luehea divaricata</em> (london plane) were selected in homogeneous forests located in southern Brazil. Each hydrothermal treatment was performed for 60 min. In general, the hydrothermal treatments caused a certain surface inactivation effect, which was marked by decreased surface roughness, increased hydrophobic character and darkened colour patterns. Also, both decreased stiffness and strength, as well as increased deflectibility were obtained. These mechanisms were attributed to degradation in fine segments from amorphous polysaccharides, leaching of some organic extractives and fragmentation of lignin, as indirectly indicated by infrared spectra.</p> 2020-10-01T00:00:00-03:00 ##submission.copyrightStatement## Durability of eucalypts wood in soil bed and field decay tests 2020-05-23T21:10:07-04:00 Pedro Nicó de Medeiros Neto Juarez Benigno Paes José Tarcísio da Silva Oliveira João Gabriel Missia da Silva José Clailson Franco Coelho Libânia da Silva Ribeiro <p>This evaluated the natural resistance of wood from seven <em>Eucalyptus </em>trees in field decay and soil bed tests. Two 12-year-old trees were randomly sampled per species, with 2,2 m logs being obtained from the &nbsp;basal section of each tree. The samples were taken in two positions in the radial direction of the stem (middle heartwood and transition zone; containing heartwood and sapwood). The field decay tests were installed in three municipalities in the southern state of Espírito Santo, and the soil utilized soil from the three field decay test areas. The field decay tests were evaluated after six, 12 and 18 months after installation and the soil bed tests after six months. The Scott-Knott test (p ≤ 0,05) was used in the analysis and evaluation of the tests. The sapwood-heartwood (transition region) exhibited the greatest mass losses for the field decay and soil bed tests. On average, for the soil bed test the lowest mass losses were observed for the soil of Vargem Alta (5,00 %), with greater mass losses observed for São José do Calçado (7,05 %) and Jerônimo Monteiro (9,90 %). In the field decay test the organisms present in the soil of São José do Calçado and related to the organic matter content <em>Eucalyptus grandis</em> and <em>Eucalyptus saligna</em> more intensely.</p> 2020-10-01T00:00:00-03:00 ##submission.copyrightStatement## The efficiency of Pistacia atlantica gum for increasing resistance of rapeseed oil-heat treated wood to fungal attacks 2020-05-25T16:26:41-04:00 Morad Mahmoud Kia Asghar Tarmian Ali Naghi Karimi Hadi Gholamiyan Ali Abdulkhani Mohamad Reza Mastri Farahani <p>In this research, we used <em>Pistacia atlantica</em> gum during cooling phase of oil-heat treatment of poplar wood (<em>Populus deltoids</em>) to improve its resistance to the white-rot fungus <em>Trametes versicolor</em> and growth of the mold fungus <em>Penicillium expansum</em>. Thermal modification was carried out using rapeseed oil at 180 °C, 200 °C and 220 °C for 2 hours and 4 hours. The modified wood specimens were then directly cooled in the oil containing 0 %, 5 % and 10 % (w/w) of the gum at 25 °C for 30 minutes. The chemical constituents of the essential oil extracted with a Clevenger type apparatus were determined by chromatography–mass spectrometry&nbsp;(GC-MS). The amounts of α-pinene, β-pinene and α-terpinolene of the essential oil were 60,2 %, 8,7 % and 3,9 %, respectively. The mold resistance was greatly improved, while the improvement against the decay fungus was only observed for the specimens modified at 180 °C. Our results confirmed that the enhanced fungal resistance was not only due to the presence of monoterpenes in the essential oil, but also to a further reduction in the hygroscopicity of the treated wood.</p> 2020-10-01T00:00:00-03:00 ##submission.copyrightStatement## Enhancing mechanical and surface properties of eucalyptus wood 2020-05-27T10:25:56-04:00 Anderson Pertuzzatti Gianluca Tondi Rodrigo Coldebella Henrique W. Dalla Costa Darci A. Gatto André L. Missio <p><em>Eucalyptus</em> is one of the most fast-growing trees. Therefore, in the last decades it has been extensively planted and harvested so that nowadays <em>Eucalyptus</em> is one of the most popular trees of the planet. There are many genres of this plant and they are often treated as a large bunch of the same timber characterized by moderate mechanical and surface properties which hinder their usage for any sight application (e.g. flooring, cladding, ceiling). In this study four species of <em>Eucalyptus</em>: <em>E. grandis</em>, <em>E. dunnii</em>, <em>E. cloeziana</em> and <em>E. tereticornis</em> were undergone to densification through hydro-thermo-mechanical treatment (HTM) first and then to oil heat-treatment (OHT) in order to improve their mechanical properties and hydrophobicity. It was observed that low density species (<em>E. grandis</em>) reaches higher compression degrees while heavier species (<em>E. tereticornis</em>) reach densities over 800 kg/m³; however, HTM decrease the variability of the properties. Treatments at higher temperature (160 °C) involves higher compression degree, lower set-recovery and higher surface hydrophobization, but also weaker mechanical properties. The hot oil post- treatment helps to contain the springback effect and to reduce the wettability of each specimen. Densified samples present similar surface hardness. The tailored application of the two treatments improves the properties of every <em>Eucalyptus</em> which can gain market also for nobler end-usages.</p> 2020-10-01T00:00:00-03:00 ##submission.copyrightStatement## Cutting energy required during the mechanical processing of wood species at different drying stages 2020-06-18T22:22:02-04:00 Taiane Oliveira Guedes José Reinaldo Moreira da Silva Paulo Ricardo Gherardi Hein Silvia Costa Ferreira <p>The aim of this study was to know the variation profile of the specific energy consumption required to cut woods with varying densities and moisture contents. Therefore, peripheral cuts were performed in the longitudinal direction of the grain with numerical control controlled by Computational Numerical Command in woods of different densities, established at different drying stages. An energy analyzer, capable of calculate the specific energy consumed during the wood processing, was used to measure the energy information. The results indicated that the higher the wood density, the greater the positive influence of the moisture content on the specific cutting energy. In the anhydrous condition, the higher the wood density, the higher the cutting energy. With increased moisture content, less cutting power was required during the wood processing. Therefore, it was possible to conclude that during the milling type mechanical processing of wood, moisture content has a great influence on the specific cutting energy consumption.</p> 2020-10-01T00:00:00-03:00 ##submission.copyrightStatement## Effect of expanded polystyrene content and press temperature on the properties of low-density wood particleboard 2020-06-22T09:43:55-04:00 Shupin Luo Li Gao Wenjing Guo <p>In this study, three-layer low-density (about 400 kg/m<sup>3</sup>) particleboards consisting of a mixture of wood particles and expanded polystyrene (EPS) were manufactured. EPS bead was incorporated in the core layer as a light filler. The influence of EPS content (0 %, 2,5 %, 5 %, 7,5 %, 10 % and 12,5 %) and press temperature (110 °C and 140 °C) on the microstructure, density profile, bending properties, internal bond and thickness swelling of the panels was investigated. Results showed that incorporation of EPS beads filled in the voids between wood particles, improved the core layer integrity, and generated a more pronounced density profile. Consequently, the bending properties and internal bond of panels adding EPS were remarkably improved, and the thickness swelling was decreased. However, the variation of the amount of EPS from 2,5 % to 12,5 % had no significant effect on the bending properties and thickness swelling. Comparing the two press temperatures, although higher temperature (140 °C) was more favourable in control panels without EPS as filler, it had a negative effect on the properties of panels with addition of EPS filler, especially for high EPS contents (10 % and 12,5 %), attributing to the shrinkage of EPS bead under press temperature that is much higher than its glass transition temperature (104 °C).</p> 2020-10-01T00:00:00-03:00 ##submission.copyrightStatement## Analysis of glue line and correlations between density and anatomical characteristics of Eucalyptus grandis × Eucalyptus urophylla glulam 2020-06-24T11:26:27-04:00 Rafael Gonçalves Espósito De Oliveira Fabricio Gomes Gonçalves Pedro Gutemberg De Alcântara Segundinho José Tarcísio Da Silva Oliveira Juarez Benigno Paes Izabella Luzia Silva Chaves Alice Soares Brito <p>This study aimed to analyze the glue line thickness effect and its relation with density and anatomical characteristics of eucalyptus wood. Thus, the thickness of main and secondary glue lines was measured as well as their interaction with apparent density of elements glued with resorcinol-formaldehyde (RF) and castor oil polyurethane (CP) adhesives. Anatomical wood characterization of <em>Eucalyptus grandis</em> × <em>E. urophylla</em> was performed by correlating glue line thickness. According to normative instruction, specimens were produced for delamination tests. The experiment was conducted in a completely random 2 × 2 design factorial scheme (two classes of wood apparent density and two adhesives). Pearson correlation (t &lt; 0,01) was performed among variables. It was found that there was adhesive penetration into vessels and rays of wood. Glue line thickness was higher in woods with density higher than to 0,58 g∙cm<sup>-3</sup> glued with RF adhesive. There was a low correlation between wood density and vessel diameter to main and secondary glue lines (t &lt; 0,01).</p> 2020-10-01T00:00:00-03:00 ##submission.copyrightStatement## Economic profitability of particleboards production with a diversified raw material structure 2020-06-29T15:57:29-04:00 Emilia Grzegorzewska Izabela Burawska-Kupniewska Piotr Boruszewski <p>To achieve sustainable development, coherence of three key elements is necessary: economic growth, social inclusion and environmental protection. They are interconnected and all are extremely important for achieving the well-being of individuals and entire societies. One of the key drivers of sustainable economic growth is the furniture industry, which is related to the maximum optimization of production cost while maintaining the high quality of the offered products. However, the expected material deficit may contribute to a significant weakening of growth dynamics. One of the possible solutions to this problem is harvesting timber from plantations of fast-growing trees that could supplement the increasing deficit of wood raw material. The research aimed to determine the cost-effectiveness of particleboard technology modification involving the change in the structure of raw material by introducing wood from fast-growing tree plantations. The research included an estimation of the unit cost of 1 m<sup>3</sup> particleboard manufactured in the series production process. The analysis was carried out on the example of one of the leading particleboard suppliers for the Polish furniture industry and consisted in comparing the cost of production of particleboards based on wood from fast-growing tree plantations with the cost of particleboards, which are commonly available on the market. Three variants of the diversified raw material structure were taken into account: 100 % share (1), 50 % share (2) and 25 % share (3) of raw material from fast-growing tree plantations. The time range of the studies was adopted for the years 2014-2020. The research indicates that the introduction of wood from fast-growing tree plantations into the production of particleboards enables the production of material and energy cost savings at the level of 6 % (3<sup>rd</sup> variant) to even 17 % (1<sup>st</sup> variant). Variant 1 of material structure can lead to cost reduction at the level of EUR 11,6 million (in case of particleboards production capacity 570000 m<sup>3</sup>).</p> <p>&nbsp;</p> 2020-10-01T00:00:00-03:00 ##submission.copyrightStatement## Evaluation of Pleurotus ostreatus basidiomes production on pinus sawdust and other agricultural and forestry wastes from patagonia, Argentina 2020-07-05T12:12:57-04:00 Maximiliano Rugolo Bernardo Lechner Romina Mansilla Gerardo Mata Mario Rajchenberg <p>The basidiomes production of two strains of <em>Pleurotus ostreatus </em>(one native from Patagonia, Argentina, isolated from the conifer <em>Araucaria araucana</em> and the other one a commercial strain) grown in different agricultural and forestry wastes was studied. The ability of the native strain generates interest to know its degradative capabilities for its use with conifer waste from the regional forest industry, which is dominated by the use of exotic <em>Pinus </em>species. In addition, white poplar (<em>Populus alba</em>), southern beech (<em>Nothofagus pumilio</em>), wheatgrass (<em>Thinopyrum ponticum</em>) and residues from beer brewing were also explored as substrates. The native strain showed better productivity of basidiomes with a biological efficiency of 17,86 % ± 3,74 % on pine wood shavings in comparison with the commercial strain used as control. The best substrates were poplar and wheatgrass with biological efficiency between 35,28 % to 88,5 % and 27,84 % to 84,01 %, respectively. Supplemented substrates showed better productivity than those without supplement. The low biological efficiency on pine could be attributed to the aromatic compounds contents because, in growth test, the diameter of the fungal colony was affected negatively by the addition of pine resin volatiles, mainly with α-limonene and δ-3-carene. In spite of the low biological efficiency, promising inter-breeding or hybrids generation could improve yields in future assays.</p> 2020-10-01T00:00:00-03:00 ##submission.copyrightStatement##