PRODUÇÃO DE CHAPAS DE PARTÍCULAS ORIENTADAS “OSB” DE <i>Eucalyptus grandis</i> COM DIFERENTES TEORES DE RESINA, PARAFINA E COMPOSIÇÃO EM CAMADAS

Iwakiri¹, Setsuo; Mendes², Lourival Marin; Saldanha³, Leopoldo Karman

doi:10.5902/198050981726

RESUMO

Este 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 físicomecânicas 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

ABSTRACT

This 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).

Key words:
OSB; Eucalytpus grandis; phenol-formaldehyde resin

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REFERÊNCIAS BIBLIOGRÁFICAS

AMERICAN SOCIETY FOR TESTING MATERIALS. Standard methods of evaluating the properties of wood-base fiber and particle materials. In: ASTM. ANNUAL Book of ASTM standards, ASTM D-1037 - 78B. Philladelphia, 1982.
CANADIAN STANDARDS ASSOCIATION. OSB and Waferboard. CSA 0437-0. Ontário: 1993.
CLOUTIER, A. Oriented strandboard (OSB): raw material, manufacturing process, properties and uses. In: International Seminar on Solid Wood Products of High Technology, 1., 1998, Belo Horizonte-MG. Proceedings ... Belo Horizonte, 1998, p. 173-185.
GEIMER, R.L. Flake alignment in particleboard as affected by machine variables and particle geometry. USDA Forest Service, 1976. (Research Paper FPL 275).
MALONEY, T.M. Modern particleboard and dry-process fiber board manufacture. San Francisco: Miller Freeman. 1993. 689p.
MARRA, A. A. Technology of wood bonding: Principles in practice. New York: Van Nostrand Reinhold, 1992. 453p.
SUZUKI, S.; TAKEDA, K. Production and properties of Japanese oriented strand board I: effect of strand and orientation on strength properties of sugi oriented strand board. Japan Wood Science, Tokyo, v. 46, p. 289-295, 2000.

Datas de Publicação

Publicação nesta coleção
Jan-Jun 2003

Histórico

Recebido
11 Jun 2002
Aceito
30 Out 2002

Este é um artigo publicado em acesso aberto sob uma licença Creative Commons

[1] AMERICAN SOCIETY FOR TESTING MATERIALS. Standard methods of evaluating the properties of wood-base fiber and particle materials. In: ASTM. ANNUAL Book of ASTM standards, ASTM D-1037 - 78B. Philladelphia, 1982.

[2] CANADIAN STANDARDS ASSOCIATION. OSB and Waferboard. CSA 0437-0. Ontário: 1993.

[3] CLOUTIER, A. Oriented strandboard (OSB): raw material, manufacturing process, properties and uses. In: International Seminar on Solid Wood Products of High Technology, 1., 1998, Belo Horizonte-MG. Proceedings ... Belo Horizonte, 1998, p. 173-185.

[4] GEIMER, R.L. Flake alignment in particleboard as affected by machine variables and particle geometry. USDA Forest Service, 1976. (Research Paper FPL 275).

[5] MALONEY, T.M. Modern particleboard and dry-process fiber board manufacture. San Francisco: Miller Freeman. 1993. 689p.

[6] MARRA, A. A. Technology of wood bonding: Principles in practice. New York: Van Nostrand Reinhold, 1992. 453p.

[7] SUZUKI, S.; TAKEDA, K. Production and properties of Japanese oriented strand board I: effect of strand and orientation on strength properties of sugi oriented strand board. Japan Wood Science, Tokyo, v. 46, p. 289-295, 2000.

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