Relação entre perfil de densidade e ligação interna de painéis OSB de Pinus spp

Abstract

RESUMOO presente trabalho teve por objetivos determinar a densidade aparente de painéis OSB de Pinus taeda e Pinus elliottii var. elliottii × Pinus caribaea var. hondurensis pelo método gravimétrico e pela densitometria de raios X, obter os perfis densitométricos e verificar sua correlação com a propriedade mecânica de ligação interna. A densidade aparente dos painéis foi determinada pela densitometria de raios X e pelo método gravimétrico, utilizando três corpos de prova (50 × 50 mm) por tratamento. Após as determinações de densidade aparente, os 24 corpos de prova foram submetidos ao ensaio de ligação interna. O método gravimétrico aplicado na determinação da densidade aparente apresentou resultados significativamente maiores do que o método densitométrico. Verificou-se que a densidade mínima do painel, obtida pela densitometria de raios X, teve forte influência na densidade média do painel. Houve correlação entre os valores de densidade aparente dos painéis obtidos por atenuação de raios X e os resultados de ligação interna.Palavras-chave: densitometria de raios X, método gravimétrico, painéis de madeira. Relationship between Density Profile andInternal Bond of Pinus spp. OSB panels ABSTRACTThis study aimed to determine the density, by gravimetric method and X-ray densitometry, of Oriented Strand Boards (OSB) produced with Pinus taeda and Pinus elliottii var. elliottii x Pinus caribaea var. hondurensis, to obtain densitometric profiles and observe their correlation with the internal bond. The average density of the panels produced was determined by the methodology of X-ray densitometry and the gravimetric method, using 3 specimens (50 × 50 mm) per treatment. After apparent density measurement, the 24 specimens were subjected to the internal bond test. The gravimetric method applied for the determination of apparent density of the panels presented significantly higher results compared with the densitometric method. It was possible to observe that the minimum density of the board, obtained by the method of X-ray densitometry, has a strong influence on its average density. Correlation was observed between the apparent densities of the panels and the results of internal bond.

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

“…The density profi le was determined according to Surdi et al (2014) and the eff ect of variables checked on the pressing process in the compaction of the particleboards. This study contributes to the quality control of both experimental and industrial particleboards (Wang et al, 2004).…”

Quality of Pinus sp. pellets with kraft lignin and starch addition

“…The wood product quality can be evaluated using non-destructive methods such as the digital X-ray images used in fields such as dentistry, orthopedics, zoology and zootechnology 26 . X-ray densitometry has been used to characterize and evaluate the deterioration of the eucalyptus wood due to white rot fungi, and to detect the limits of the heartwood-sapwood, the effect of forest management on the wood properties, the annual production of biomass and the relation with its anatomical structure 27 – 29 . However, this technique is under-used for evaluating the internal density of solid biofuels such as briquettes and pellets 25 , 30 , 31 .…”

“…characterize and evaluate the deterioration of the eucalyptus wood due to white rot fungi, and to detect the limits of the heartwood-sapwood, the effect of forest management on the wood properties, the annual production of biomass and the relation with its anatomical structure [27][28][29] . However, this technique is under-used for evaluating the internal density of solid biofuels such as briquettes and pellets 25,30,31 .…”

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

“…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).…”