Estabilidade dimensional e resistência à tração perpendicular de painéis fabricados com partículas termorretificadas oriundas de embalagens de Pinus sp.

Vital, Benedito Rocha; Andrade, Paulo Ivan Lima de; Carneiro, Angélica de Cássia Oliveira; Cabral, Carla Heloísa Avelino; Carvalho, Ana Márcia Macêdo Ladeira

doi:10.1590/s0100-67622014000500020

Cited by 5 publications

(7 citation statements)

References 9 publications

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“…Table 2, where significant differences have been found. Vital et al (2014) produced panels with Pinus sp. heat treated for 900 s in a rotor with gas heating and obtained values of 0.89 MPa for the control treatment, 0.46 MPa at 160°C (433 K), and 0.42 MPa at 200°C (473 K).…”

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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Section: Resultsmentioning

confidence: 99%

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

2019

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“…It was observed that the thermal treatment reduced the equilibrium moisture content of the particles and 35.86 and 12.38% were obtained for sugarcane bagasse and bamboo, respectively. Vital et al (2014) obtained (TS2h), in 24h (TS24h) and non-recoverable tax (NRT), of the particleboards according to the treatments and adhesive contents used. Tabela 2 -Densidade específi ca aparente (DEA), teor de umidade (TU), absorção de água em 2h (AA2h) e 24 horas (AA24h), Inchamento em espessura após 2h (AA2h) e 24 h (AA24h) de imersão em água e taxa de não-retorno em espessura (TNRE) dos painéis em função dos tratamentos e teores de adesivo empregados.…”

Section: Equilibruim Moisture Content and Alteration In The Color Of unclassified

“…The thermal treatment modifi es the structure of the material and reduces the equilibrium moisture content through the degradation of the chemical components and formation of a lignin crossed bond, which aff ects the water adsorption (Surini et al, 2012). The decrease in the equilibrium moisture content enables the manufacture of particleboards of higher dimensional stability, however, the degradation of the OH-(hydrophilic) groupings may hamper the action of the adhesive during the consolidation of the particleboards (Vital et al, 2014).…”

Section: Equilibruim Moisture Content and Alteration In The Color Of mentioning

confidence: 99%

“…The time and temperature adopted for the thermal modifi cation process can improve the dimensional stability, strength to weather changes and biodeteriorating agents, wettability and bonding with hydrophobic adhesives, and reduce the equilibrium moisture content and swell the thickness of the particleboards (Brito, 2018). According to some studies, the thermal treatment of wood particles improved the physical properties of the particleboards (Paul et al, 2007;Mendes et al, 2013;Vital et al, 2014).…”

Section: Introductionmentioning

confidence: 99%

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Thermal Modification of Sugarcane Waste and Bamboo Particles for the Manufacture of Particleboards

Brito

Bortoletto

2019

Rev. Árvore

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The thermal modification of particles of the paticleboards constituted of agroforest and industrial waste can improves the dimensional stability (thickness variation) and reduces the use of chemicals that can raise the costs of the process or be hazardous to humans and the environment. This study evaluated the effect of the thermal modification on the physical-mechanical properties and density profile of particleboards manufactured from sugarcane bagasse and bamboo (Dendrocalamus asper) (Schult f.) Backer ex Heyne). A mixture of 75% bamboo particles and 25% sugarcane bagasse was subjected to 220 °C temperature for 201 min. Urea-formaldehyde (UF)-based adhesive with three solids contents (10, 12 and 14%) based on the dry mass of the particles was used for the aggregation of the materials. Both temperature and increases in the adhesive content improved their dimensional stability, however, the thermal treatment reduced the mechanical properties. The particleboards composed of treated particles did not meet the minimum specifications established by the Brazilian norm utilized. The densitometric profiles were negatively influenced by the thermal modification and improved by the increase in adhesive content.

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“…Other researches aimed at improving the dimensional stability and mechanical strength of wood particleboard continue to be developed (KNOW et al 2013;VITAL et al 2014;ANDRADE et al 2016). Among which we can mention the inclusion or laminar-ply, characterized by the insertion of veneers on the panel faces.…”

Section: Introductionmentioning

confidence: 99%

Laminar Inclusion in Sugarcane Bagasse Particleboard

Oliveira

Freire

Pereira

et al. 2017

CERNE

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ABSTRACT:The objective of this study is to assess the effect of the laminar inclusion on the physical and mechanical properties of sugarcane bagasse particleboard. We used the commercial panels of sugarcane bagasse produced in China. To evaluate the effect of the laminar inclusion was tested two wood species (Pinus and Eucalyptus) and two pressures (10 and 15 kgf . cm -2 ) along with a control (without laminar inclusion). The panels with laminar inclusion obtained improvements in the physical properties, with a significant reduction in the WA2h, WA24h and TS2h. There was a significant increase in the properties MOE and MOR parallel and Janka hardness, while the properties MOE and MOR perpendicular decreased significantly. The pinus and eucalyptus veneers inclusion resulted in similar results when added to the panel with a 10 kgf . cm -2 pressure. The use of 15 kgf . cm -2 pressure is not indicated for the pinus veneer inclusion in sugar cane bagasse panels. There was no effect of the pressure level when evaluating the eucalyptus veneer inclusion on the properties of the sugarcane bagasse panels. INCLUSÃO LAMINAR EM PAINÉIS AGLOMERADOS DE BAGAÇO DE CANA DE AÇÚCARRESUMO: O objetivo deste estudo é avaliar o efeito da inclusão laminar sobre as propriedades físicas e mecânicas de painéis aglomerados de bagaço de cana-de-açúcar. Foram utilizados painéis comerciais de bagaço de cana-de-açúcar produzidos na China. Para avaliar o efeito da inclusão laminar foram avaliadas duas espécies de madeira (Pinus e Eucalyptus) e duas pressões (10 e 15 kgf . cm -2 ), juntamente com um controle (sem inclusão laminar). Os painéis com inclusão laminar obtiveram melhorias nas propriedades físicas, com uma redução significativa na AA2h, AA24h e IE2h. Houve um aumento significativo nas propriedades MOE e MOR paralelo e dureza Janka, enquanto as propriedades MOE e MOR perpendicular diminuíram significativamente. A inclusão laminar de pinus e eucalipto resultou em resultados semelhantes quando adicionadas ao painel com uma pressão de 10 kgf . cm -2 . O uso de pressão de 15 kgf . cm -2 não é indicado para a inclusão laminar de pinus em painéis de bagaço de cana-de-açúcar. Não houve efeito do nível de pressão ao avaliar a inclusão laminar de eucalipto nas propriedades dos painéis de bagaço de cana-de-açúcar.

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Estabilidade dimensional e resistência à tração perpendicular de painéis fabricados com partículas termorretificadas oriundas de embalagens de Pinus sp.

Cited by 5 publications

References 9 publications

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

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

Thermal Modification of Sugarcane Waste and Bamboo Particles for the Manufacture of Particleboards

Laminar Inclusion in Sugarcane Bagasse Particleboard

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