PROPRIEDADES FÍSICAS E MECÂNICAS DE PAINÉIS MDF DE DIFERENTES MASSAS ESPECÍFICAS E TEORES DE RESINA

Eleotério, Jackson Roberto; Tomazello, Mario; Bortoletto, Geraldo

doi:10.5902/19805098482

RESUMO

Painéis MDF foram preparados, em escala laboratorial, com base em fibras de Pinus spp. com diferentes teores de resina (6, 8, 10, 12 e 14%) e massas específicas (600 a 800 kg/m³) com o objetivo de avaliar suas propriedades físicas e mecânicas. Os efeitos da massa específica e do teor de resina, bem como sua interação foram avaliados tendo como base as propriedades físicas e mecânicas dos painéis MDF. As propriedades mecânicas avaliadas foram módulo de elasticidade e de ruptura e adesão interna, enquanto as propriedades físicas foram absorção de água e inchamento em espessura. Todas as variáveis se relacionaram significativamente com os fatores massa específica e teor de resina e a interação foi significativa a 1% apenas no inchamento em espessura. Foram propostos modelos para avaliar as propriedades físicas e mecânicas em razão da massa específica e do teor de resina.

Palavras-chave:
painéis MDF; teor de resina; densidade; propriedades físicas e mecânicas

ABSTRACT

MDF Panelboards of Pinus spp. fibers were prepared in laboratorial scale, within a range of densities (600 - 800 kg/m3) and urea-formaldehyde resin content (6, 8, 10, 12 and 14 wt. %), with the purpose of evaluating their mechanical and physical properties. The effect of density and resin content and their interactions were analyzed based on panel mechanical and physical properties. Mechanical properties evaluated were modulus of rupture and modulus of elasticity and internal bond, while physical properties studied were thickness swelling and water absorption. All the physical and mechanical properties of the MDF panels were significantly related to the resin content and density. Models have been proposed to evaluate the physical and mechanical variables of the MDF panels taking into account the average density and resin content.

Key words:
MDF; resin content; density; physical and mechanical properties

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REFERÊNCIAS BIBLIOGRÁFICAS

BENADUCE, C. Fabricação de Painéis de Média Densidade (MDF) a partir de Fibras de Eucalyptus grandis W. Hill Ex Maiden e Pinus caribaea Morelet var. hondurensis Barret e Golfari. 1998. Dissertação (Mestrado em ...) - Escola Superior de Agricultura "Luiz de Queiroz", Universidade de São Paulo, Piracicaba.
CARLL, C. G. Review of thickness swell in hardboard siding: effect of processing variables. Madison, WI: USDA, Forest Service, Forest Products Laboratory, 1996. 10 p. (Gen. Tech. Rep. FPL-GTR-96.)
CHOW, P. Properties of medium-density, dry-formed fiberboard from seven hardwood residues and bark. Forest Products Journal, v. 26, n. 5, p. 48-55, 1976.
EUROPEAN COMMITTEE FOR STANDARDIZATION. European Standard EN 319 - particleboards and Fiberboards - determination of tensile strength perpendicular to the plane of the board. Bruxelas, 1993a.
EUROPEAN COMMITTEE FOR STANDARDIZATION.. European Standard EN 310 - wood-based panels - determination of modulus of elasticity in bending and of bending strength. Bruxelas, 1993b.
EUROPEAN COMMITTEE FOR STANDARDIZATION.. European Standard EN 317 - particleboards and Fiberboards - determination of swelling in thickness after immersion in water. Bruxelas, 1993c.
EUROPEAN COMMITTEE FOR STANDARDIZATION.. European Standard EN 323 - woodbased panels - determination of density. Bruxelas, 1993d.
KELLY, M. W. Critical literature review of relationships between processing parameters and physical properties of particleboard. Madison, WI: USDA, Forest Service, Forest Products Laboratory , 1977. 65 p. (Gen. Tech. Rep. FPL-10).
LABOSKY Jr., P. et al Effect of steam pressure refining and resin levels on the properties of UF-bonded red maple MDF. Forest Products Journal , v. 43, n. 11/12, p. 82-88, 1993.
MALONEY, T. M. The family of wood composite materials. Forest Products Journal , v. 46, n. 2, p. 19-26, Feb. 1996.
MALONEY, T. M. Modern particleboard e dry-process fiberboard manufacturing. San Francisco: Miller Freeman, 1989. 672 p.
NELSON, N. D. Effects of wood and pulp properties on medium-density, dry-formed hardboard. Forest Products Journal , v. 23, n. 9, p. 72-80, Sep. 1973.
PIZZI, A. Advanced wood adhesives technology. New York: Marcel Dekker, 1994. 297 p.
PUGEL, A. D.; PRICE, E. W.; HSE, C. Y. Composites from southern pine juvenile wood. Part 1. Panel fabrication and inicial properties. Forest Products Journal , v. 40, n. 1, p. 29-33, Jan. 1990.
SUCHSLAND, O.; WOODSON, G. E. Fiberboard manufacturing practices in United States. Washington, DC:USDA, 1987. 263p. (USDA. Agricultural Handbook n. 640)
WOODSON, G. E. Properties of medium-density fiberboard related to hardwood specific gravity. In: TENTHPARTICLEBOARD SYMPOSIUM, 1976, Washington. Proceedings... Washington: Washington State University, 1976. p. 175-192.

Datas de Publicação

Publicação nesta coleção
Jul-Dec 2000

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

[1] BENADUCE, C. Fabricação de Painéis de Média Densidade (MDF) a partir de Fibras de Eucalyptus grandis W. Hill Ex Maiden e Pinus caribaea Morelet var. hondurensis Barret e Golfari. 1998. Dissertação (Mestrado em ...) - Escola Superior de Agricultura "Luiz de Queiroz", Universidade de São Paulo, Piracicaba.

[2] CARLL, C. G. Review of thickness swell in hardboard siding: effect of processing variables. Madison, WI: USDA, Forest Service, Forest Products Laboratory, 1996. 10 p. (Gen. Tech. Rep. FPL-GTR-96.)

[3] CHOW, P. Properties of medium-density, dry-formed fiberboard from seven hardwood residues and bark. Forest Products Journal, v. 26, n. 5, p. 48-55, 1976.

[4] EUROPEAN COMMITTEE FOR STANDARDIZATION. European Standard EN 319 - particleboards and Fiberboards - determination of tensile strength perpendicular to the plane of the board. Bruxelas, 1993a.

[5] EUROPEAN COMMITTEE FOR STANDARDIZATION.. European Standard EN 310 - wood-based panels - determination of modulus of elasticity in bending and of bending strength. Bruxelas, 1993b.

[6] EUROPEAN COMMITTEE FOR STANDARDIZATION.. European Standard EN 317 - particleboards and Fiberboards - determination of swelling in thickness after immersion in water. Bruxelas, 1993c.

[7] EUROPEAN COMMITTEE FOR STANDARDIZATION.. European Standard EN 323 - woodbased panels - determination of density. Bruxelas, 1993d.

[8] KELLY, M. W. Critical literature review of relationships between processing parameters and physical properties of particleboard. Madison, WI: USDA, Forest Service, Forest Products Laboratory , 1977. 65 p. (Gen. Tech. Rep. FPL-10).

[9] LABOSKY Jr., P. et al Effect of steam pressure refining and resin levels on the properties of UF-bonded red maple MDF. Forest Products Journal , v. 43, n. 11/12, p. 82-88, 1993.

[10] MALONEY, T. M. The family of wood composite materials. Forest Products Journal , v. 46, n. 2, p. 19-26, Feb. 1996.

[11] MALONEY, T. M. Modern particleboard e dry-process fiberboard manufacturing. San Francisco: Miller Freeman, 1989. 672 p.

[12] NELSON, N. D. Effects of wood and pulp properties on medium-density, dry-formed hardboard. Forest Products Journal , v. 23, n. 9, p. 72-80, Sep. 1973.

[13] PIZZI, A. Advanced wood adhesives technology. New York: Marcel Dekker, 1994. 297 p.

[14] PUGEL, A. D.; PRICE, E. W.; HSE, C. Y. Composites from southern pine juvenile wood. Part 1. Panel fabrication and inicial properties. Forest Products Journal , v. 40, n. 1, p. 29-33, Jan. 1990.

[15] SUCHSLAND, O.; WOODSON, G. E. Fiberboard manufacturing practices in United States. Washington, DC:USDA, 1987. 263p. (USDA. Agricultural Handbook n. 640)

[16] WOODSON, G. E. Properties of medium-density fiberboard related to hardwood specific gravity. In: TENTHPARTICLEBOARD SYMPOSIUM, 1976, Washington. Proceedings... Washington: Washington State University, 1976. p. 175-192.

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