Avaliação do potencial de espécies manejadas na Amazônia para produção de painéis “EGP” (Edge Glued Panels) não estrutural
The present work tries to develop novel technologies for enhancing the utilization of five managed tropical timber species, furnish reliable data for their manufacturing into non-structural EGP at a regional level and for indicating new ones to be used in this market. The studied material compris...
| Autor principal: | Araújo, Roberto Daniel de |
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| Grau: | Tese |
| Idioma: | por |
| Publicado em: |
Instituto Nacional de Pesquisas da Amazônia – INPA
2020
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| Assuntos: | |
| Acesso em linha: |
https://repositorio.inpa.gov.br/handle/1/4994 http://lattes.cnpq.br/2344839114869655 |
| Resumo: |
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The present work tries to develop novel technologies for enhancing the utilization of
five managed tropical timber species, furnish reliable data for their manufacturing into
non-structural EGP at a regional level and for indicating new ones to be used in this
market. The studied material comprised wood from Angelim pedra (Himenolobium
pulcherrimum), Angelim vermelho (Dinizia excelsa), Breu vermelho (Protium
puncticulaton), Murici (Byrsonima crispa) and Piãozinho (Micrandropsis scleroxylon),
obtained in the municipality of Manaus / AM, (ZF-2 / EEST / INPA - BR-174 and
Madeireira Portela). The logs were processed in planks / boards and dried at 12%
moisture in a microwave system. Chemical (total extractives, water solubility, NaOH
solubility, lignin, crude cellulose, pH and ash) and physical-mechanical (basic
density, apparent density, modulus of elasticity (MOE) and modulus of rupture (MOR)
and moisture) properties were assessed obeying the normative procedures. The five
different timber species were machined and pre-machined into (25 x 50 x 240 mm)
and (C = 10 mm, α = 31 °, P = 1 mm) parts, for the manufacture of the EGPs using
an industrial spindle. Cold and hot polyvinyl adhesive PVA was used on the top and
side junctions, respectively, whereas cold EPI was only used on the lateral surface,
utilizing a pneumatic press. Test specimens (14.00 x 10.00 x 2.5 cm) were used in
the roughness, sandpaper granulometry and coating assays. EGPs’ bonding, static
bending, traction and shearing assessment tests were performed. Data were
analyzed using ANOVA and Tukey's test. Timber species physical-mechanical
properties assessment results presented an 0.62 g/cm³ average (basic density) and
12,528 MPa (MOE). The chemical part related to NaOH solubility (8.24%) and pH
(6.31) showed to be directly related to the physical-mechanical attributes of the wood
and EGPs. The lowest roughness value was obtained with 180 grain sandpaper
(Piãozinho - 0.0094 μm). As to the varnishes, Murici and Piãozinho panels have
shown to be the ones which consumed the least in their application. Regarding
EGPs’ coating, Piãozinho, Angelim pedra and Breu vermelho, were those that
obtained the best degree of fixation. The best results on static flexion and traction
were obtained with Piãozinho, 37.29 and 18.08 MPa. Red Angelim (10.89 MPa) and
Piãozinho (10.74 MPa) shear using EPI adhesive presented the highest resistance.
Panel wood properties overall assessment showed Piãozinho and Angelim pedra to
presented the best technological aptitude for the EGPs manufacturing. This
assessment confirms these timber species to be good for the production of these
panels by assisting on the decision-making for their exploitation sustainable
management programs. |