No presente trabalho objetivou-se avaliar o potencial de utilização da madeira de Eucalyptus badjensis como alternativa para a produção de painéis de madeira aglomerada, bem como analisar o efeito da sua utilização em mistura com a madeira de Pinus spp. Nesse sentido, foram confeccionados painéis utilizando madeira de E. badjensis e de Pinus spp., nas composições homogênea e em camadas, utilizando 12% do adesivo ureia-formaldeído. Foram produzidos painéis com densidade nominal de 650 kg.m-3 , dimensões de 40 × 40 × 1,55 cm (largura, comprimento e espessura), ciclo de prensagem utilizando pressão de 40 kgf.cm-2 e temperatura de 180ºC durante 8 minutos. Ademais, foi realizada a análise química da madeira em que foram determinados os teores de extrativos totais, cinzas, lignina e holocelulose. Além disso, foram executadas análises da geometria das partículas, sendo estudados o índice de esbeltez, razão de planicidade e área superficial específica. Para os painéis, as propriedades físicas e mecânicas analisadas foram: densidade aparente, absorção de água e inchamento em espessura após 2 e 24 horas, módulos de elasticidade e ruptura à flexão estática (MOE) e (MOR) e tração perpendicular. Com o presente estudo pode-se concluir que a madeira de E. badjensis, bem como suas misturas com Pinus spp. apresentam potencial para produção de painéis de madeira aglomerada.
This paper aimed to evaluate the technological properties of particleboards produced with particles of unconventional species, bamboo of the species Phyllostachys edulis, and of the genus traditionally used by the sector for the production of the particulate panels in Brazil, Pinus spp.The bamboo splints of 3 years old were collected in Frei Rogério, Santa Catarina, being transformed into particles in a mill hammer, while the particles of Pinus spp. were collected from the industrial process of MDP production in Bonet Madeiras e Papéis Ltda Company in Santa Cecília, Santa Catarina. The company used eight-year-old logs of P. taeda and P. elliottii from the thinning process, without distinction of the species. The experiment was composed of five compositions with mixing the bamboo and wood particles in different proportions ((T1)100:0%; (T2)75:25%; (T3)50:50%; (T4)25:75%; (T5)0:100%). The panels were produced nominal density of 700 kg / m³ and pressing cycle of 160ºC and 40 kgf/cm² for 8 minutes. Results reporting physical and mechanical properties of panels were evaluated through Analysis of Variance and Tukey´s Test at 95% probability. The results evidenced that bamboo particles presented potential for the production of particleboard. The most promising results were presented with the addition of 50% of bamboo in the panel composition (T3), mainly by means observed for dimensional stability, as for strength and stiffness. Values of internal bond presented significantly lower averages with the addition of more than 25% of bamboo.
The objective of this study was to evaluate the technical feasibility of producing particleboard from oversize resin fibers in a reduced proportion of adhesive. It was used as raw material, oversize resin fibers discarded from the MDF (Medium Density Fiberboard) production process, flake particles of Pinus spp. derived from an MDP (Medium Density Particleboard) company’s chipper and adhesive formed by the urea-formaldehyde resin and paraffin emulsion. The experiment consisted of five treatments, mixing particles and fibers in different proportions (100: 0%; 75: 25%; 50: 50%; 25: 75%; 0: 100%). Three panels were produced per treatment, with nominal density of 650 kg.m-3, 8% resin and pressing cycle of 160ºC, 40 kgf.cm-2 for 8 minutes. The properties of the panels were evaluated by the procedures described in ASTM D-1047 (1993), DIN 53362 (1982) and ABNT / NBR 14810 (2013). The results showed that oversize resin fibers have potential for use in the sector, especially in quantities above 75%, a fact that was evidenced by the values found for dimensional stability and strength/stiffness. For internal adhesion, the increase in the number of fibers above 25% was not significant.
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