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Estudo Preliminar das Propriedades de Compensados Produzidos com Lâminas de Paricá (Schizolobium amazonicum Huber ex Ducke) Modificadas Termomecanicamente

DOI: http://dx.doi.org/10.12953/2177-6830.v02n01a03

http://www.ufpel.tche.br/revistas/index.php/cienciadamadeira/index 

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Larissa M. Arruda1, Joaquim C. Gonçalez2, Cláudio H. S. Del Menezzi2 & Rafael R. de Melo3

 

Resumo: O objetivo deste trabalho foi estudar, preliminarmente, os efeitos da modificação termomecânica de lâminas de Paricá (Schizolobium amazonicum Huber ex Ducke) para produção de compensados de melhor qualidade em termos de higroscopicidade e propriedades mecânicas. Para isso, foram usadas 24 lâminas de 25 x 25 cm, tratadas à temperatura de 150°C, tempos de cinco, 10 e 15 minutos e pressão de 1 N.mm-2, constituindo três tratamentos e uma testemunha não tratada. Os compensados foram colados com o adesivo resorcinol-formaldeído, na gramatura de 360 g.m-2 e prensados à temperatura ambiente a 1 N.mm-2, durante 10 horas. A avaliação das amostras foi realizada por meio da análise colorimétrica e das propriedades físico-mecânicas. A análise colorimétrica mostrou que houve escurecimento da madeira com o aumento do tempo do tratamento. O tratamento não se mostrou eficiente em reduzir o inchamento em espessura dos compensados, somente reduziu a absorção de água. As propriedades mecânicas não foram significativamente afetadas pelo tratamento.

Palavras-chave: tratamento termomecânico, higroscopicidade, propriedades mecânicas, compensado

 

Abstract: The objective of this preliminary research was to study the effects of thermomechanical modification in veneers of Paricá (Schizolobium amazonicum Huber ex Ducke) to improve plywood hygroscopicity and mechanical properties. The amount of 24 veneers was used with the dimensions 25 x 25 cm, that were compressed under different times (5, 10 and 15 minutes) at 150°C and pressure at 1 N.mm-2, constituting three treatments and one untreated. Plywood were bonded with resorcinol-formaldehyde, glue consumption of 360 g.m-2 at ambient temperature and pressure of 1 N.mm-2 for 10 hours. The samples were evaluated by colorimetric analysis and physical and mechanical properties. Colorimetric analysis showed that there was a darkening of the wood toward the increase of treatment time. The treatment was not efficient in reducing swelling, only reducing absorption of water. The mechanical properties were not significantly affected by the treatment.

Key words: thermo-mechanical treatment, hygroscopicity, mechanical properties, plywood

 

1 Engenheira Florestal. Mestranda em Ciências Florestais. Departamento de Engenharia Florestal, Campus Darcy Ribeiro, Universidade de Brasília (UnB), Brasília-DF. CEP 70919-970. E-mail: calliandra.sp@gmail.com
2 Engenheiro Florestal, Dr. Professor do Departamento de Engenharia Florestal, Campus Darcy Ribeiro, Universidade de Brasília (UnB), Brasília-DF. CEP 70919-970. E-mail: goncalez@unb.br; cmenezzi@unb.br
3 Engenheiro Florestal, M.Sc. Professor Assistente, Campus Professora “Cinobelina Elvas”, Universidade Federal do Piauí (UFPI), Bom Jesus-PI. Doutorando em Ciências Florestais pela Universidade de Brasília (UnB), Brasília-DF. E-mail: rrmelo2@yahoo.com.br

 

Literatura Citada

BEKHTA, P.; MARUTZKY, R. Reduction of Glue Consumption in the Plywood Production by Using Previously Compressed Veneer. European Journal of Wood Products, Heidelberg, v. 65, n. 1, p. 87-88, 2007.

BEKHTA, P.; NIEMZ, P.; SEDLIACIK, J. Effect of Pre-Pressing of Veneer on the Glueability and Properties of Veneer-Based Products. European Journal of Wood Products, Heidelberg, v. Online First. (DOI: 10.1007/s00107-010-0486-y), 2010.

BHUIYAN, M. T. R; HIRAI, N.; SOBUE, N. Effect of Intermittent Heat Treatment on Cristallinity in Wood Cellulose. Journal of Wood Science, Tokyo, v. 47, n. 5, p. 336-416, 2001.

BHUIYAN, M. T. R; HIRAI, N.; SOBUE, N. Changes of Cristallinity in Wood Cellulose by Heat Treatment Under Dried and Moist Conditions. Journal of Wood Science, Tokyo, v. 46, n. 6, p. 431-436, 2000.

CAMARGOS, J. A.; GONÇALEZ, J. C. A Colorimetria Aplicada como Instrumento na Elaboração de uma Tabela de Cores de Madeira. Brasil Florestal, Brasília, v. 20, n. 71, p. 30-41, 2001.

CANDAN, Z.; HIZIROGLU, S.; MCDONALD, A. G. Surface Quality of Thermally Compressed Douglas fir Veneer. Materials and Design, v. 31, n. 7, p. 3574-3577, 2010.

CARVALHO, P. E. R. Paricá Schizolobium amazonicum. Circular Técnica 142, Colombo, Paraná. EMBRAPA Florestas, 2007. 8p.

CHARRIER, B.; CHARRIER, F.; JANIN, G.; KAMDEM, D. P.; IRMOULI, M.; GONÇALEZ, J. C. Study of Industrial Boiling Process on Walnut Colour: Experimental Study under Industrial Conditions. European Journal of Wood Products, Heidelberg, v. 60, n. 4, p. 259-264, 2002.

CHRISTIANSEN, A. W. Effect of Overdrying on Toughness of Yellow-popular Veneer. European Journal of Wood Products, Heidelberg, v. 55, n. 2-4, p. 71-75, 1997.

CLOUTIER, A.; FANG, C.; MARIOTTI, N. Densification of Wood Veneers Under the Effect of Heat, Steam and Pressure. In: INTERNATIONAL CONVENTION OF SOCIETY OF WOOD SCIENCE AND TECHNOLOGY, 51., 2008, Conception, Chile. Anais... Chile: Universidad del Bío-Bío, 2008.

DEL MENEZZI, C. H. S. Estabilização Dimensional por Meio do Tratamento Térmico e Seus Efeitos Sobre as Propriedades de Painéis de Partículas Orientadas (OSB). 2004. 242f. Tese (Doutorado em Engenharia Florestal) – Universidade Federal do Paraná, Curitiba, 2004.

DEL MENEZZI, C. H. S.; TOMASELLI, I. Contact Thermal Post-Treatment of Oriented Strandboard to Improve Dimensional Stabillity: A preliminary Study. European Journal of Wood Products, Heidelberg, v. 64, p. 212-217, 2006.

DEL MENEZZI, C. H. S.; TOMASELLI, I.; OKINO, E. Y. A.; TEIXEIRA, D. E.; SANTANA, M. A. E. Thermal Modification of Consolidated Oriented Strandboards: Effects on Dimensional Stability, Mechanical Properties, Chemical Composition and Surface Color. European Journal of Wood Products, Heidelberg v. 67, n. 4, p. 383-396, 2009.

EUROPEAN STANDARD. BS EN 310: Wood-based panels. Determination of modulus of elasticity in bending and of bending strength. Brussels, 1993.

EUROPEAN STANDARD. BS EN 317: Particleboards and fiberboards. Determination of swelling in thickness after immersion in water. Brussels, 1993.

EUROPEAN STANDARD. BS EN 314-1: Plywood – Bonding Quality. Part 1: Test Methods. Brussels, 2004.

FPL - FOREST PRODUCTS LABORATORY. Wood Handbook: Wood as an Engineering Material. Madison: USDA Forest Service, Forest Products Laboratory, 508p. 2010. (General Technical Report FPL-190).

GRZESKIEWICZ, M.; BORYSIUK, P.; JASKÓLOWSKI, W. Physical and Mechanical Properties and Burning Behavior of Beech Plywood Made of Thermally Modified Veneers. In: INTERNATIONAL PANEL PRODUCTS SYMPOSIUM, 13., Nantes, France. Proceedings… Nantes: IPPS, 2009. p. 1-36.

HEGER, F.; GROUX, M.; GIRARDET, F.; WELZBACHER, C. R.; RAPP, A. O.; NAVI, P. Mechanical and Durability Performance of THM Densified Wood In: WORKSHOP COST ACTION E22 ‘ENVIRONMENTAL OPTIMIZATION OF WOOD PROTECTION. Lisboa, Portugal. Proceedings... Lisboa, 2004. p. 1-26.

KAMDEM, D. P.; PIZZI, A.; JERMANNAUD, A. Durability of Heat-Treated Wood. European Journal of Wood Products, Heiderlberg, v. 60, n. 1, p. 1-6, 2002.

KELLY, M. W. Critical Literature Review of Relationships Between Processing Parameters and Physical Properties of Particleboard. Madison: U.S. Department of Agriculture, Forest Service, Forest Products Laboratory, 1977. 65p.

KULTIKOVA, E. Structure and Properties Relationships of Densified Wood. 1999. 133f. Master Thesis (Master of Science in Wood Science and Forest Products) - Faculty of the Virginia Polytechnic Institute and State University, Virginia Tech, Blacksburg, Virginia, 1999.

KUTNAR, A.; KAMKE, F. A.; SERNEK, M. Density Profile and Morphology of Viscoelastic Thermal Compressed Wood. Wood Science and Technology, Heidelberg, v. 43, n. 1-2, p. 57-68, 2009.

MORSING, N. Densification of Wood the Influence of Hygrothermal Treatment on Compression of Beech Perpendicular to the Grain. Kgs. Lyngby: Technical University of Denmark, 2000. p.1-145.

ROWELL, R. M.; YOUNGS, R. L. Dimensional Stabilization of Wood in Use. Gen. Tech. Rep. FPL-0243. Madison: U.S. Department of Agriculture, Forest Service, Forest Products Laboratory, 1981. 8p.

STAMM, A. J.; CHIDESTER. Yearbook of Agriculture 1943-1947. U.S. Departament of Agriculture, 1947.

SUNDQVIST, B. Colour Changes and Acid Formation in Wood During Heating. 2004. 154f. Thesis (Doctoral) – Lulea University of Technology, Skelleftea, Sweden, 2004.

WELZBACHER, C. R.; WEHSENER, J.; RAPP, A. O.; HALLER, P. Thermo-Mechanical Densification Combined with Thermal Modification of Norway spruce (Picea abies Karst) in Industrial Scale - Dimensional Stability and Durability Aspects. Holz Roh Werkst, v. 66, p.39-49, 2008.