Density profile as a tool in assessing quality of new composite

Belini, Ugo Leandro; Fiorelli, Juliano; Savastano, Holmer; Filho, Mário Tomazello

doi:10.1590/s1516-14392013005000186

Cited by 6 publications

(4 citation statements)

References 8 publications

(10 reference statements)

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“…Figure 3 shows the influence of the rape straw share on the density profile of the 16-mm particleboard. Similar profiles were obtained by Belini et al (2014) for composites made of bagasse and eucalyptus. They detected decreased and inhomogeneous density in the central region along the thickness for panels with 75% and 100% bagasse, indicative of incomplete resin cure, or improper particle size and anatomical structure of the particles in the inner panel, or changes in the press cycle variables.…”

Section: Physical Testingsupporting

confidence: 77%

Morphology, physical, and mechanical properties of particleboard made from rape straw and wood particles glued with urea-formaldehyde resin

Coşereanu

Cerbu

2019

BioRes

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The morphology, physical, and mechanical properties were investigated for single-layer particleboard made with various proportional contents of wood and rape stalk particles glued with urea-formaldehyde resin. Fine crushed rape stalk particles were used for the experimental particleboards. The weight ratios of rape-to-wood particles were 0:100, 10:90, 30:70, 50:50, and 70:30. Mixed beech and spruce wood particles with percentages of 30% for beech wood and 70% for spruce wood were considered for the configuration. Urea-formaldehyde resin with a solid content of 66 ± 1% was added to the single-mat configuration at a level of 12%, based on the weight of the particles. Physical (density, water absorption, and thickness swelling) and mechanical (modulus of elasticity, bending strength, internal bond strength) investigations on the particleboards obtained in the laboratory conditions were conducted. The results were compared to the requirements of the EN 312 (2004) standard. In addition, morphological observation at macro- and micro-scale and vertical density profile analysis was conducted on particleboards in order to characterize the interaction between wood-rape particles and resin. Variations of the structure and density were observed relative to thickness, providing information concerning to the internal bond performance of the panels.

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“…It is also applied in other materials similar to wood. For example, Zhaohui et al [18] use this same technique to determine the radial density variation profile of bamboo; while Belini et al [19] use densitometry to evaluate the quality of medium density fiberboards (MDF).…”

Section: Introductionmentioning

confidence: 99%

Application of the X-ray densitometry in the evaluation of the quality and mechanical properties of biomass pellets

Moya

Filho

et al. 2015

Fuel Processing Technology

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a b s t r a c tThe use of the X-ray technique and the X-ray densitometry to determine pellet particle distribution and to understand the biomass compaction and its effects in pellet properties has been limited. The present work evaluates the quality of pellets manufactured with several lignocellulosic materials by using X-ray photography for studying surface cracks and irregularities, and by using X-ray densitometry to evaluate density and its variation in longitudinal and transversal directions. Density values and their variation were correlated to the pellets' mechanical properties (mechanical durability and compression resistance). It was found that X-ray photography may be applied to evaluate the presence of cracks and irregularities in the pellets' surface; however, these are not indicators of pellet durability or compression resistance. Moreover, density evaluation by the X-ray densitometry technique allowed the determination of the pellets' mechanical resistance and durability. A negative correlation was observed between the force at break and the coefficient of variation of density. No correlation was found between the mechanical durability and the average density or its variation. According to the above results, X-ray technique can be utilized to study the pellet quality.

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“…Após a primeira redução de partículas, iniciou o processo de secagem das partículas que consistiu em duas etapas sendo a primeira ao ar livre. E a segunda etapa em Utilizando a Microscopia Eletrônica de Varredura (MEV), foram obtidas imagens para verificar a interação das partículas de madeira/resina no interior dos painéis, bem como a obtenção dos perfis de densidade dos painéis ao longo da espessura (BELINI et al, 2013).…”

Section: Metodologiaunclassified

Cidades Sustentáveis E O Aproveitamento De Resíduos De Poda Urbana Para Transformação Em Painéis Aglomerado

Ribaski¹,

Alves²,

Soczek³

et al. 2023

CLCS

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Nos grandes centros urbanos, a geração de resíduos sólidos vem provocando uma grande preocupação entre os gestores das cidades. A busca por soluções na área de resíduos reflete a demanda da sociedade que pressiona por mudanças motivadas pelos elevados custos socioeconômicos e ambientais. Caso ocorra o manejo adequado dos resíduos sólidos, os mesmos podem adquirir valor comercial e serem utilizados em forma de novas matérias-primas ou novos insumos, criando um novo ciclo de vida para esses resíduos. O objetivo desse trabalho é confeccionar painéis aglomerado com resíduos de poda urbana testando a granulometria das partículas e aglutinados com adesivo de baixa emissão de formol. A metodologia seguida é a pesquisa exploratória, que se justifica pela necessidade em conceber as configurações adequadas para o aproveitamento do resíduo de poda urbana da cidade de Curitiba - PR para a produção de painéis de madeira reconstituída. Foram coletados resíduos de poda e realizadas adequação granulométrica para a realização da fabricação exploratória de painéis, com partículas de 2 e 6 mm, aglutinados com resina à base de lignina residual, código comercial AE-1105, vegetal poliuretana de mamona – castor oil e E1 (baixa emissão de formaldeído). Após a confecção desses painéis, foram realizadas fotos utilizando o Microscópio Eletrônico de Varredura – MEV e realizados os ensaios de determinação da densidade, determinação do Inchamento em Espessura e determinação de absorção de água. Os resultados apresentados mostraram a possibilidade da confecção desses painéis, apontando para os ensaios contendo a resina de mamona com os melhores resultados.

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“…Diversas pesquisas investigaram os efeitos da temperatura, umidade e a configuração das partículas de madeira sobre a formação do perfil de densidade (KELLY, 1977;SUO;BOWYER, 1994;DAI et al, 2000;WANG et al, 2000) e o efeito das formas de tal perfil sobre as propriedades dos painéis de partículas (KELLY, 1977;XU, 1999;WONG et al, 1999;SURDI et al, 2014;BELINI et al, 2014).…”

Section: Perfil De Densidadeunclassified

Aproveitamento de resíduos do processamento mecânico de madeiras amazônicas para a produção de painéis aglomerados de alta densificação

Surdi¹

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Density profile as a tool in assessing quality of new composite

Cited by 6 publications

References 8 publications

Morphology, physical, and mechanical properties of particleboard made from rape straw and wood particles glued with urea-formaldehyde resin

Application of the X-ray densitometry in the evaluation of the quality and mechanical properties of biomass pellets

Cidades Sustentáveis E O Aproveitamento De Resíduos De Poda Urbana Para Transformação Em Painéis Aglomerado

Aproveitamento de resíduos do processamento mecânico de madeiras amazônicas para a produção de painéis aglomerados de alta densificação

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