Produção de chapas de partículas orientadas “OSB” de <i>Eucalyptus grandis</i> com diferentes teores de resina, parafina e composição em camadas.

Abstract

RESUMOEste trabalho foi desenvolvido com o objetivo de avaliar a influência dos seguintes parâmetros de processo de produção sobre as propriedades das chapas "OSB": composição das chapas em camadas cruzadas com proporções face-miolo-face de 30-40-30 e 20-60-20 em relação à composição homogênea; e, quantidades de 3, 4,5 e 6,0% de resina fenol-formaldeído, com incorporação de 0,5 e 1,0% de emulsão de parafina. Os resultados demonstraram que a composição das chapas, com a relação 20-60-20, apresentou melhor balanço das propriedades de flexão estática entre os sentidos de ensaios paralelo e perpendicular ao plano da chapa. A quantidade de 6,0% de resina foi a que resultou em melhores propriedades físico-mecânicas das chapas "OSB". A produção de chapas "OSB" de Eucalyptus grandis, com 4,5 e 6,0% de resina fenol-formaldeído, superou as exigências mínimas de propriedades mecânicas das chapas "OSB" referendadas pela norma canadense CSA 0437-0 (1993). Palavras-chave: chapas "OSB", Eucalyptus grandis, resina fenol-formaldeído. ABSTRACTThis paper was carried out aiming to evaluate the influence of the following processing variables on the properties of OSB: face to core layer ratios of 30-40-30 and 20-60-20 in relation to a single layer; phenol-formaldehyde resin content of 3, 4.5 and 6.0% and addition of 0.5 or 1.0% of wax sizing. The results showed that the boards composed of face to core layer ratios of 20-60-20, presented the better balance in static bending tests, both in the machine and cross-machine directions. The application of 4.5 and 6.0% of resin resulted in better physical and mechanical properties of the OSB. The OSB produced with Eucalyptus grandis, and 4.5 and 6.0% of phenol-formaldehyde resin were in compliance with values of the mechanical properties of the Canadian Standards CSA 0437-0 (1993).

Mechanical Properties of OSB Wood Composites with Resin Derived from a Renewable Natural Resource

“…According to [18], [19] and [20], the density of this wood is close to that recommended for use in the manufacture of OSB boards [21].Castor oil-based polyurethane resin was used as a binding agent due to its excellent performance in boards, as observed in previous studies [12], [15], [16] and [22].…”

“…As regards the direction of strands on the board surfaces and inside, we opted for three layers: strands were placed in the same direction in both outer layers and randomly placed in the inner layer. In accordance with [20], the adopted surface/core/surface ratio was 20:60:20, based on the dry weight percentage of strands sprayed with binding agent (Figure 2). Four 350×350×10mm boards were manufactured.…”

Modulus of Elasticity in Static Bending for Oriented Strand Board (OSB)

“…Following Iwakiri et al [18], a proportion (face, inner, face) 20:60:20 was chosen, based on dry particles weight.…”

Production of Structural OSB with Cajueiro (Anacardium sp.) and Amescla (Trattinikia sp.) - A Preliminary Study

“…It has been followed the instruction set proposed by [8], among others. At beginning, wood battens were cut in small pieces with 90mm width and 45mm thickness.…”