Use of glass transition temperature for stabilization of board's cracks of Eucalyptus grandis

Autor(es)

Calonego, Fred W. ^[1] ; Severo, Elias T. D. ^[1] ; Cunha, Antonio R. ^[2] ; Gaia, Daiane C. ^[1]

Afiliação do(s) autor(es)

^[1] UNESP, Fac Ciencias Agron, Dept Recursos Nat Ciencias Florestais, BR-18610307 Botucatu, SP - Brazil

^[2] UNESP, Fac Ciencias Agron, Dept Recursos Nat Ciencias Ambientais, BR-18610307 Botucatu, SP - Brazil

• Tipo de documento: Artigo Científico
• Fonte: Anais da Academia Brasileira de Ciências; v. 82, n. 3, p. 791-797, SEP 2010.
• Citações Web of Science: 6

Resumo

The Eucalyptus grandis logs temperatures were determined and correlated with the board's cracks during steaming. Thermocouples were inserted in the logs center, registering their temperatures during steaming at 90"C. The logs were sawed and the board's cracks measured. It was concluded that: (1) the logistic S-shaped curve explains the logs temperature variation; (2) the logs with diameter of 20 to <25, 25 to <30 and 30 to <35 cm presented, respectively, 84.2"C, 73.1"C and 45.8"C in the steaming; and (3) the cracks lengths significantly decreased in logs that reached the glass transition temperature. (AU)

• Processo FAPESP: 02/05028-6 - Vaporização de toras visando à qualidade de desdobro e secagem da madeira serrada de Eucalyptus grandis
• Beneficiário: Fred Willians Calonego
• Modalidade de apoio: Bolsas no Brasil - Mestrado
• Processo FAPESP: 00/02165-7 - Efeito da vaporização preliminar e secagem no teor de umidade inicial gradiente de umidade e taxa de secagem em madeira serrada de Eucalyptus
• Beneficiário: Elias Taylor Durgante Severo
• Modalidade de apoio: Auxílio à Pesquisa - Jovens Pesquisadores