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Ciência Florestal

Print version ISSN 0103-9954On-line version ISSN 1980-5098

Ciênc. Florest. vol.10 no.2 Santa Maria JulyDec. 2000

http://dx.doi.org/10.5902/19805098482 

Artigos

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

MECHANICAL AND PHYSICAL PROPERTIES OF MDF PANELS OF DIFFERENT DENSITIES AND RESIN CONTENT

Jackson Roberto Eleotério1 

Mario Tomazello Filho2 

Geraldo Bortoletto Júnior2 

1 Engenheiro Florestal, M.Sc., Professor do Departamento de Engenharia Florestal, Fundação Universidade Regional de Blumenau, CEP 89012-900, Blumenau (SC).

2 Engenheiro Florestal, Dr., Professor do Departamento de Ciências Florestais, Escola Superior de Agricultura Luiz de Queiróz, Universidade de São Paulo, CEP 13418-900, Piracicaba (SP).


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

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