Enhancing mechanical and surface properties of eucalyptus wood

Anderson Pertuzzatti ^[1] ; Gianluca Tondi ^[2] ; Rodrigo Coldebella ^[1] ; Henrique W. Dalla Costa ^[1] ; Ronan Corrêa ^[1] ; Darci A. Gatto ^[4] ; André L. Missi ^[3]
1. [1] Universidade Federal de Santa Maria
  
  Universidade Federal de Santa Maria
  
  Brasil
2. [2] Salzburg University of Applied Sciences
  
  Salzburg University of Applied Sciences
  
  Salzburg, Austria
3. [3] Universidade Federal de Pelotas
  
  Universidade Federal de Pelotas
  
  Brasil
4. [4] Faculty of Materials Engineering. FederalUniversity of Pelotas. Brasil
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Localización: Maderas: Ciencia y tecnología, ISSN 0717-3644, ISSN-e 0718-221X, Vol. 22, Nº. 4, 2020, págs. 467-476
Idioma: español
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Resumen
- Eucalyptus is one of the most fast-growing trees. Therefore, in the last decades it has been extensively planted and harvested so that nowadays Eucalyptus 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 Eucalyptus: E. grandis, E. dunnii, E. cloeziana and E. tereticor-nis 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 (E. grandis) reaches higher compression degrees while heavier species (E. tereticornis) 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 hydropho-bization, 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 Eucalyptus which can gain market also for nobler end-usages