Abstract
ABSTRACT In the Amazon, the sustainable use of wood is associated with technological research that indicates industrial use. Surface roughness of wood is an important criterion for assessing tool condition, machining performance and product quality. The objective of this study was to evaluate the surface roughness of five Amazonian woods used in the manufacture of EGP (Edge Glued Panels).The woods Angelim pedra, Angelim vermelho, Breu vermelho, Murici and Piãozinho, obtained from managed areas of the Amazon, were used in the manufacture of EGP panels. Surface treatments were performed with 120 and 180 grit sandpaper. Surface ripples (roughness) were measured using a digital roughness meter with needle (n = 180 readings). Physical and mechanical tests were performed on both wood and EGP samples, to verify the possible relationship between these properties and roughness. EGP Piãozinho presented better surface quality, which consists of lower roughness (lower surface wave height), while EGP Angelim pedra presented uneven surfaces. Surface quality was satisfactory when 120 grain sandpaper was applied to most products. The results showed a highly significant effect of roughness such as the physical-mechanical properties. The highlight of the study is the wood and EGP Piãozinho, because in all the tests, it always presented the best performances.
Highlights
The Brazilian Amazon has a great diversity of forest species with timber potential, few species are used commercially, leading to a very selective exploitation of the forest with negative impacts on the forest ecosystem
Cutting conditions are directly affected by rotational speed as well as cutting thickness, resulting in better wood surface quality, i.e. surface roughness increases with increasing feed rate (Li et al, 2017; Thoma; Peri; Lato, 2015)
Machining efficiency is the foundation for having flat surfaces with low roughness
Summary
The Brazilian Amazon has a great diversity of forest species with timber potential, few species are used commercially, leading to a very selective exploitation of the forest with negative impacts on the forest ecosystem. Research aimed at increasing the use of species for industrial use becomes a priority for regional development in the Amazon, in order to optimize forest exploitation under sustainable management Another important factor for the sustainable use of wood is its application in the manufacture of reconstituted products such as chipboard, MDF and newly side glued wood panels (EGP). These products can be manufactured in larger dimensions, presenting greater dimensional stability and better distribution of mechanical strength, with quality gains and better cost-benefit ratio (Almeida et al, 2017; Costa Tienne et al, 2011)
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