Surface roughness of edge glued panels (EGP) of amazon maneged species

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.

WITHDRAWN: Technological Profile of Small-diameter Forest Species in a Managed Area in the Amazon

“…The chemical properties of certain species can also favor or harm the gluing process in engineered products. Araújo et al (2019), working with EGP manufacturing using Amazonian wood, associated good performance in gluing angelim-pedra wood (Hymenolobium pulcherrimum) to low mineral concentrations (0.17%). In another study with wood panels, Kniess et al (2015) associated the high performance of adhesive bonds with the chemical composition of the wood (pH, extractives, and ash).…”

“…An alternative to this situation is the replacement of these species with others with similar wood properties and with su cient growth stock in the forest. In this sense, interest and the search for studies on the technological characterization of new species have intensi ed (Souza et al 2016; Araújo et al 2019; Reis et al 2019).…”

Evaluation of conventional and microwave drying of tropical Amazonian wood indicated for the manufacture of EGP (Edge Glued Panels)

“…The quality of wood for the manufacture of certain engineered products (MDL, CLT, EGP panels, among others) needs to combine attributes such as medium density, low concentration of extractives, medium roughness, and mainly low moisture, and for edge glued panels (EGPs), the content acceptable minimum is 12%. Bila et al (2016) [9] and Araújo et al (2019) [10] assessed the use of Amazon wood for EGP panels and found similar results regarding the standard of end product, considering that the properties were enhanced by drying the wood.…”

“…In the method used, the voltage wave variables are extracted from the stress wave timer device [10] and calculated by the following equation: MOED = (L/t)2 × D/g × 10 -5 L = sample length (m), t = wave propagation time (s), D = sample density (kg/m 3 ) and g = gravity acceleration (m/s 2 ).…”

Characterization of technological properties of matá-matá wood (Eschweilera coriacea [DC.] S.A. Mori, E. odora Poepp. [Miers] and E. truncata A.C. Sm.) by Near Infrared Spectroscopy

“…Applying the non-destructive methodology (NIR) on wood from Picea sitchensis (Sitka spruce), Pinus sylvestris (Scots pine) and 24 tropical species, Nuopponen et al (2006) sought to establish the relationship between chemical constitution and wood density, concluding that tropical wood had greater density than spruce and pine woods, and also verifying that tropical species had a higher content of lignin in their composition than other woods. Araújo et al (2019), studying managed wood species in the Amazon and applying the traditional methodology, identified the predominance of wood with high density (murici, Byrsonima crispa, 0.71 g cm -3 ; piãozinho, Micrandropsis sclerorylon, 1.18 g cm -3 ). Within this range, Fróes et al (2019) found mean values of 0.77 g cm -3 for E. truncata wood by applying the same (destructive) methodology, while Nascimento et al (2017) determined the density of E. odora by NIR, obtaining mean values of 0.80 g cm -3 .…”