Effects of thermal pre-treatment and variables of production on properties of OSB panels of Pinus taeda

Mendes, Rafael Farinassi; Júnior, Geraldo Bortoletto; Almeida, Natalie Ferreira de; Surdi, Paula Gabriella; Barbeiro, Isabela Najm

doi:10.4067/s0718-221x2013005000012

Cited by 12 publications

(7 citation statements)

References 22 publications

(30 reference statements)

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“…De acordo com Carvalho et al (2015) o tratamento térmico também pode ser uma alternativa no aprimoramento da estabilidade dimensional dos painéis produzidos, por reduzir a afinidade com água, uma vez que, visa degradar a hemicelulose e liberar a tensão de compressão formada durante a prensagem, porém o calor durante o processo pode promover a redução das propriedades mecânicas (Mendes et al, 2013).…”

Section: A B Cunclassified

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Painéis aglomerados fabricados com resíduos do coco babaçu

Furtado

Fiorelli

Júnior

et al. 2017

Agraria

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RESUMOA produção de painéis aglomerados no mundo é sustentada pelas espécies de Pinus spp. e Eucalyptus spp. Todavia, o uso de resíduos de epicarpo e endocarpo provenientes do processo de extração da amêndoa do coco babaçu pode ser uma alternativa de matéria prima à baixo custo. Nessa pesquisa, objetivou-se avaliar a viabilidade técnica de utilização destes resíduos na produção de painéis aglomerados. Foram produzidos painéis 100% epicarpo (100EP), 100% endocarpo (100EN) e 50% epicarpo com 50% endocarpo (50EP) aglutinados com resina poliuretana bicomponente à base de óleo de mamona com um teor de 12% em relação ao peso seco das partículas. A avaliação dos painéis produzidos foi realizada com base nos procedimentos das Normas Técnicas NBR 14810-2 (ABNT, 2013) e ANSI A208.1 (ANSI, 2009) com caracterização física (densidade, inchamento em espessura e absorção de água em 2 e 24 h) e mecânica (adesão interna, módulo de elasticidade e módulo de ruptura na flexão estática). Os resultados obtidos nesta pesquisa indicam a inviabilidade técnica de utilização dos resíduos do coco babaçu na produção de painéis aglomerados, pois não atendem os valores mínimos de propriedades físicas exigidos pelos documentos normativos. No entanto, promovem excelente desempenho mecânico, especialmente o epicarpo do coco babaçu. Palavras-chave: insumos alternativos; painéis de madeira; propriedades físico-mecânicas Agglomerated panels made from babaçu coconut residues ABSTRACTThe particleboard manufacturing in the world is sustained by the species Pinus spp. and Eucalyptus spp. However, the use of waste epicarp and endocarp from the extraction process almond coconut babassu can be an alternative raw material at low cost. This research, objective was to assess the technical feasibility of using these residues in the production of particleboard. The panels were produced: 100% epicarp (100EP), 100% endocarp (100EN) and 50% epicarp 50% endocarp (50EP) bonded with polyurethane bi-component resin castor oil base with a 12% content on dry weight the particle. The evaluation of particleboard produced was based on the procedures of NBR Technical Standards 14810-2:2013 and ANSI A208.1:2009 with physical characteristics (density, thickness swelling and water absorption at 2 and 24 h) and mechanical (internal adhesion, modulus of elasticity and modulus of rupture in bending). The results obtained in this research indicate the technical impossibility of using residues of babassu coconut in the production of agglomerated panels, since they do not meet the minimum values of physical properties required by normative documents. However, they promote excellent mechanical performance, especially the babassu coconut epicarp.

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Section: A B Cunclassified

“…Essa condição promove a maior penetração das moléculas de água nos espaços submicroscópicos localizados entre as microfibrilas, provocando a expansão destas devido ao afastamento das mesmas. Segundo Mendes et al (2013) esse acúmulo das moléculas de água nas cavidades celulares gera maiores agravos as propriedades físicas dos painéis aglomerados.…”

Section: A B Cunclassified

Painéis aglomerados fabricados com resíduos do coco babaçu

Furtado

Fiorelli

Júnior

et al. 2017

Agraria

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“…All treatments in this study met this requirement for OSB panels used for structural purposes in humid environments. Mendes et al (2013b) studied Pinus taeda and verified that the moisture content decreased from 8.55 to 7.64% when using a heat treatment of 200°C (473 K) on the strands. When the panels went through a heat treatment without the replacement of atmosphere, their values were higher than the values found in this study.…”

Section: Resultsmentioning

confidence: 86%

“…Poubel, Garcia, Santos, Oliveira, and Abreu (2013) performed a thermal treatment on Pinus caribaea wood and observed a decrease in the density at 200°C (473 K). Mendes et al (2013b) showed a decrease in the density in relation to a controlled temperature of 240°C (513 K), where a thermal treatment was made on strands with atmosphere replacement. Values varied from 694 to 746 kg*m -3 .…”

Section: Resultsmentioning

confidence: 99%

Production and characterization of heat treated OSB made of <i>Pinus taeda

2019

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Oriented strand board (OSB) panels, like plywood, are destined for structural use. Both of them may undergo preservative treatments that extend their lifetime and increase their resistance against weathering and xylophagous agents. One possibility is a heat treatment where the wood is exposed to temperatures above 130°C (403 K), which causes chemical, physical, and mechanical changes. The aim of this work was to produce OSB made of Pinus taeda thermally treated without replacement of atmosphere for an inert gas. The physical properties of density, moisture content, and thickness swelling in water immersion for 24 hour were evaluated. The mechanical properties of static bending were determined by the modulus of elasticity (MOE), modulus of rupture (MOR), and an internal bond test. Boards were heattreated at 160, 180, and 200°C (433, 453 and 473 K), and panels were produced with heat-treated strands at 160 and 180°C (433 and 453 K). The heat treatment of boards did not affect mechanical properties compared to the control treatment. The thermal treatment of strands reduced the physical and mechanical performances of the panels.

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“…However, in wet conditions, the IB values were 0.16 N/mm 2 and 0.24 N/mm 2 for the commercial and red maple OSBs, respectively, for boards with thicknesses of 0.025 inches, 0.035 inches, and 0.045 inches. The IB ranged from 0.39 N/mm 2 to 0.43 N/mm 2 and decreased to the range of 0.13 N/mm 2 to 0.18 N/mm 2 after the boil test for boards with 10 mm thick (Ciobanu et al 2014 (Mendes et al 2013). Also, the values of the IB, MOR (parallel), and MOE (parallel) were 0.495 MPa to 0.950 MPa, 69 MPa to 72 MPa, and 8135 MPa to 9050 MPa, respectively, for aspen/birch OSB-Ponderosa pine OSB bonded with PVA type I with thickness of 12 mm (Barbuta et al 2012).…”

mentioning

confidence: 93%

Some Physico-mechanical Characteristics of Uncoated OSB ECO-products Made from Scots Pine (Pinus sylvestris L.) and Bonded with pMDI Resin

et al. 2018

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Some mechanical and physical properties and the formaldehyde content of uncoated oriented strand boards (OSBs) that were made from Scots pine (Pinus sylvestris L.), manufactured with different thicknesses, and bonded with polymeric methylene di(phenyl isocyanate) (pMDI) resin were evaluated. All of the mechanical and physical properties were affected significantly by the OSB type (3 and 4) and thickness of the panels, except for the thickness swelling after 24 h and measured formaldehyde content. The measured mechanical and physical properties of the OSB panels satisfied the standard requirements. The densities of the panels ranged from 554.2 kg/m 3 to 580.2 kg/m 3 and from 573.8 kg/m 3 to 610.7 kg/m 3 for OSB/3 and OSB/4, respectively, which met the standard requirements. The measured mechanical and physical properties of the OSB/4 panels were higher than those of the OSB/3 panels, but there were no differences in the thickness swelling after 24 h and measured formaldehyde content. Low formaldehyde contents were found for OSB/3 (0.00 mg/100 g and 0.29 mg/100 g) and OSB/4 (0.18 mg/100 g and 0.47 mg/100 g).

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Effects of thermal pre-treatment and variables of production on properties of OSB panels of Pinus taeda

Cited by 12 publications

References 22 publications

Painéis aglomerados fabricados com resíduos do coco babaçu

Painéis aglomerados fabricados com resíduos do coco babaçu

Production and characterization of heat treated OSB made of <i>Pinus taeda

Some Physico-mechanical Characteristics of Uncoated OSB ECO-products Made from Scots Pine (Pinus sylvestris L.) and Bonded with pMDI Resin

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