Fourteenth International Particleboard Symposium held at Washington State University Structural Panels, Binders, and Medium Density Fiberboard

Maloney, T. M.

doi:10.1007/bf00350949

Cited by 40 publications

(47 citation statements)

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“…This was because of more than 60% wood particle used to manufacture WPCs, the plastic material could not totally cover fine wood particles (Chen et al 2006 and Sanadi et al 2001 ). Moreover, Maloney ( 1977 ) reported that the relatively large surface area of the fine materials might be another cause of strength loss of the composites. The MOE of WPC panels were statistically different according to the ANOVA and LSD (α = 0.05).…”

Section: Resultsmentioning

confidence: 99%

Flat-pressed wood plastic composites from sawdust and recycled polyethylene terephthalate (PET): physical and mechanical properties

et al. 2013

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This study deals with the fabrication of composite matrix from saw dust (SD) and recycled polyethylene terephthalate (PET) at different ratio (w/w) by flat-pressed method. The wood plastic composites (WPCs) were made with a thickness of 6 mm after mixing the saw dust and PET in a rotary type blender followed by flat press process. Physical i.e., density, moisture content (MC), water absorption (WA) and thickness swelling (TS), and mechanical properties i.e., Modulus of Elasticity (MOE) and Modulus of Rupture (MOR) were assessed as a function of mixing ratios according to the ASTM D-1037 standard. WA and TS were measured after 24 hours of immersion in water at 25, 50 and 75°C temperature. It was found that density decreased 18.3% when SD content increased from 40% to 70% into the matix. WA and TS increased when the PET content decreased in the matrix and the testing water temperature increased. MOE and MOR were reached to maximum for the fabricated composites (2008.34 and 27.08 N/mm2, respectively) when the SD content were only 40%. The results indicated that the fabrication of WPCs from sawdust and PET would technically feasible; however, the use of additives like coupling agents could further enhance the properties of WPCs.

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Section: Resultsmentioning

confidence: 99%

Flat-pressed wood plastic composites from sawdust and recycled polyethylene terephthalate (PET): physical and mechanical properties

et al. 2013

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“…Da mesma forma como em absorção de água, as razões de compactação dos painéis não afetaram de forma clara os resultados de inchamento em espessura. Os conceitos apresentados por Maloney (1993) e Moslemi (1974) sobre a influência direta da maior razão de compactação sobre o inchamento em espessura, não foram comprovados para os painéis aglomerados produzidos com as nove espécies de madeiras tropicais em estudo. Vital et al (1974) também não encontraram diferenças no inchamento em espessura 24 horas para painéis aglomerados de virola com razão de compactação de 1,2 e 1,6.…”

Section: Propriedades Físicas Dos Painéisunclassified

“…A escolha de espécies de madeira para produção de painéis aglomerados deve ser baseada em alguns parâmetros importantes como a densidade, pH e extrativos (Moslemi 1974;Maloney 1993;Tsoumis 1991). A densidade da madeira é um dos requisitos básicos na escolha de espécies para produção de painéis aglomerados, por influenciar diretamente na sua razão de compactação.…”

Section: Introductionunclassified

“…Segundo o autor, nos painéis com maior razão de compactação, há maior quantidade de partículas de madeira e, consequentemente, ocorrerá maior densificação do painel, resultando em maior inchamento higroscópico da madeira e liberação das tensões de compressão geradas durante o processo de prensagem à alta temperatura. Maloney (1993) afirma que as espécies com densidade de até 0,55 g.cm -3 são as mais adequadas para produção de painéis de partículas por atingirem uma razão de compactação entre 1,3 e 1,6, considerada faixa ideal para o processo de densificação e consolidação do painel até a espessura final. Numa pesquisa conduzida por Vital et al (1974) sobre painéis aglomerados produzidos com Virola spp., uma espécie de madeira tropical da Amazônia com massa específica aparente (peso e volume seco na estufa) de 0,43 g.cm -3 , com razão de compactação dos painéis de 1.2:1.0 (baixa) e 1.6:1.0 (alta), os autores encontraram aumentos significativos nos resultados de tração perpendicular e flexão estática (MOE e MOR).…”

Section: Introductionunclassified

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Avaliação das propriedades de painéis aglomerados produzidos com resíduos de serrarias de nove espécies de madeiras tropicais da Amazônia

et al. 2012

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, utilizando a resina uréia-formaldeído na proporção de 8% de sólidos -base peso seco das partículas. Os painéis foram prensados com pressão específica de 4,0 MPa, temperatura de 160 ºC e tempo de prensagem de oito minutos. As avaliações dos resultados de ensaios obtidos nesta pesquisa indicam a viabilidade técnica de utilização das nove espécies provenientes de florestas tropicais da Amazônia na produção de painéis de madeira aglomerada, com destaque para Ecclinusa guianensis Eyma (Caucho) que, de uma forma geral, apresentou melhores resultados de propriedades físico-mecânicas. PALAVRAs-CHAVe: Painéis aglomerados, madeiras tropicais, uréia-formaldeído. , using the urea-formaldehyde resin in the proportion of 8% of solid content based on oven dried wood particles. The boards were pressed at the specific pressure of 40 kgf/cm², temperature of 160 ºC and press time of eight minutes. The evaluations of test results obtained in this study indicate the potential use of the nine species from Amazon rainforest in the production of particleboard, highlighting Ecclinusa guianensis (Caucho) that, in general, showed better results of physical and mechanical properties. Evaluation of the properties of particleboard made from sawmill waste of nine tropical wood species of Amazon

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“…Moslemi 35 and Maloney 36 propose that a compaction ratio (CR) higher than 1.3 allows a better densification of the wood panel. Thus, the groups with polymeric material until 40% fit this recommendation.…”

Section: Resultsmentioning

confidence: 99%

High density polyethylene matrix composite as reinforcing agent in medium density fiberboards

Barnasky

Cunha

Oliveira

et al. 2020

Journal of Composite Materials

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This work provides a study about the incorporation of a high density polyethylene (HDPE) matrix composite in medium density fiberboards (MDF). A composite was processed in a single screw extruder with 5% of Pinus spp fibers in a HDPE matrix and applied as reinforcing agent in MDFs, as well as pure HDPE, in 11 different variations, using 12% of urea-formaldehyde resin and nominal density of 750 kg.m−3. The composite and the pure HDPE were analyzed by differential scanning calorimetry (DSC), thermogravimetric analysis (TGA) and scanning electron microscopy (SEM). The DSC results showed that both polymeric matrix and composite presented the same melting temperature but the composite had a reduced melting enthalpy and crystallinity due to thermal history. SEM analysis showed a well distribution of fibers on the composite. The results of technological properties of MDFs were compared to commercial MDF standards. The MDF reinforced with 40% of polymeric composite reached all minimum standard requirements, being the most recommended to be used as an alternative to conventional MDF, in terms of physical and mechanical performance.

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Fourteenth International Particleboard Symposium held at Washington State University Structural Panels, Binders, and Medium Density Fiberboard

Cited by 40 publications

References 0 publications

Flat-pressed wood plastic composites from sawdust and recycled polyethylene terephthalate (PET): physical and mechanical properties

Flat-pressed wood plastic composites from sawdust and recycled polyethylene terephthalate (PET): physical and mechanical properties

Avaliação das propriedades de painéis aglomerados produzidos com resíduos de serrarias de nove espécies de madeiras tropicais da Amazônia

High density polyethylene matrix composite as reinforcing agent in medium density fiberboards

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