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

Caracterização tecnológica da madeira de três espécies florestais cultivadas no Amazonas: Alternativa para produção de lenha

 ResumoAs espécies florestais Acacia mangium, Inga edulis e Tachigalia chrysophyllum foram pré-selecionadas para utilização em plantios energéticos. Com o objetivo de caracterizar essas espécies, foram realizados testes a partir das variáveis densidade básica, poder calorífico e análise imediata. O experimento foi implantado na Estação Experimental da EMBRAPA no município de Iranduba/AM. O delineamento foi em blocos ao acaso com três repetições, perfazendo 9 parcelas compostas de 25 plantas cada. Foram retiradas cinco árvores dentre as nove centrais da área útil. Destas, foram retirados os discos com 5 cm de espessura e desdobrados em corpos de prova, para se determinar a densidade básica e demais testes. Realizou-se análise de variância e teste de Tukey a 5% de probabilidade. A Acacia mangium (24,16 cm – 13,09 m) superou as demais em diâmetro e altura, respectivamente. Os dados médios obtidos para densidade básica classificam todas as espécies como madeira de densidade baixa, média e levemente densa. O poder calorífico observado em Acacia mangium (4430,37 kcal/kg) foi estatisticamente superior às demais espécies. Na análise imediata, as espécies apresentaram resultados satisfatórios, sendo apontadas como madeiras adequadas para uso no processo da queima. Os resultados demonstram que as espécies possuem qualidade para produção de lenha.AbstractEnergetic characterization of native and exotic forest species cultivated at Amazonas. The forest species Acacia mangium, Inga edulis and Tachigalia chrysophyllum were pre-selected to be used at energetic crops. In order to their characterization, tests of basic density, heating power and immediate analysis were performed. The experiment was carried out at EMBRAPA’s Experimental Station, located at Iranduba/AM and was designed as randomized blocks, with three repetitions, comprising 9 plots with 25 plants each. Five trees were removed from the nine central ones of the utile area. Discs of 5 cm thick were removed from them and divided into proof bodies to evaluate basic density and other variables. Analysis of variance and Tukey test at 5% of probability were done. Acacia mangium (20.82 cm – 13.41 m) presented greater diameter and height, respectively, than the other species. The data of basic density average classified all three species as low, medium and dense-lightly density wood. The heating power observed for Acacia mangium (4430.37 kcal/kg) was statistically superior to other species. All three species presented satisfactory results at immediate analysis, being identified as suitable woods for use in burning process. Results show that the species present quality for fire wood production.Keywords: Biomass; basic density; heating power; immediate analysis; planting. The forest species Acacia mangium, Inga edulis and Tachigalia chrysophyllum were pre-selected to be used at energetic crops. In order to their characterization, tests of basic density, heating power and immediate analysis were performed. The experiment was carried out at EMBRAPA’s Experimental Station, located at Iranduba/AM and was designed as randomized blocks, with three repetitions, comprising 9 plots with 25 plants each. Five trees were removed from the nine central ones of the utile area. Discs of 5 cm thick were removed from them and divided into proof bodies to evaluate basic density and other variables. Analysis of variance and Tukey test at 5% of probability were done. Acacia mangium (20.82 cm – 13.41 m) presented greater diameter and height, respectively, than the other species. The data of basic density average classified all three species as low, medium and dense-lightly density wood. The heating power observed for Acacia mangium (4430.37 kcal/kg) was statistically superior to other species. All three species presented satisfactory results at immediate analysis, being identified as suitable woods for use in burning process. Results show that the species present quality for fire wood production

Colorimetric characterization of three wood species from the amazon forest

The aim of this study was to analyze wood color variability in the (radial, tangential and transversal) anatomic sections of Breu-vermelho, Tauari-vermelho and Pequiarana species through quantitative colorimetry using CIELAB color system. Such species come from a forest sustainable area of Thousand Precious Woods Company, located in Itacoatiara in the Amazon region of Brazil. Five wood samples from each species were selected so as to determine the following colorimetric parameters: L*, a*, b*, C e h*. In addition, 225 measurements were carried out with Konica Minolta CM-5 spectrophotometer connected to the computer. Results pointed out to statistical differences in the colorimetric parameters and also a low saturation in a* in the analyzed species. According to the cluster gathering, Breu-vermelho wood presents olive and/or grayish pink color, Tauari-vermelho is pinkish-gray and Pequiarana is grayish-pink and/or pinkish-gray. Such species presented differences in color among the three anatomic sections cited above and were also influenced by the yellow color defined in b* parameter. To summarize, colorimetric analysis to establish wood color is a simple procedure which may be used from the sawing of the logs until their final exploitation enabling value aggregation to the final product