Abstract
This work aimed to evaluate the physical and mechanical properties of particleboard panels manufactured with wood particles from Sequoia sempervirens and Pinus taeda and urea-formaldehyde resin (UF), using different mixing ratios of the two species, namely 100%, 0%, 75%, 50% and 25% of sequoia particles. Properties evaluated included panel density and compaction ratio, water absorption and thickness swelling after 24 hours of immersion, internal bond and static bending (MOE and MOR). The low density of sequoia wood raised the compaction ratio of the panels and helped improve their mechanical properties and dimensional stability. Panels manufactured at the ratios of 100%, 75%, 50% and 25% sequoia to pine provided better results compared to panels manufactured with 100% pine. Results of MOE and MOR under static bending and of internal bond met the minimum requirements of standard EN 312:2003 in all treatments. Results revealed that Sequoia sempervirens has great potential for production of particleboard.
Highlights
Use of new, fast-growing wood species obtained in forest stands for particleboard production has been the focus of several studies in Brazil in recent decades
To establish the physico-mechanical properties, nine specimens were taken from each panel to determine density and compaction ratio; nine specimens were taken to determine water absorption and thickness swelling after 24 hours of immersion in water; six specimens were subjected to bending tests to determine the modulus of elasticity (MOE) and modulus of rupture (MOR), static by using a universal testing machine and dynamic by applying stress waves; and nine specimens were subjected to internal bond testing
The low density of sequoia wood and the consequent increase in compaction ratio were found to influence the increase in the mechanical properties and the reduction in the physical properties of the resulting panels
Summary
Fast-growing wood species obtained in forest stands for particleboard production has been the focus of several studies in Brazil in recent decades. Given that Brazil’s MDF and particleboard companies rely on pine and eucalyptus as the main sources of raw material, and there is a need to increase the supply of wood available with alternative species. From the 1990s, the Brazilian sector of reconstituted wood panels has expanded considerably and has shown a significant increase in its production capacity, with introduction of new particleboard and MDF industrial units. The increase in panel production has boosted the demand for raw material, and so the forest sector has been looking for future alternatives capable of responding to limited supplies of pine and eucalyptus woods, quantitatively and qualitatively. Several researchers have engaged in studies about alternative species to pine and eucalyptus woods for the manufacture of particleboard panels. Trianoski et al (2011b) evaluated the potential of species Acrocarpus
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