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

Anais da Academia Brasileira de Ciências

Fred W. Calonego¹  Elias T.d. Severo¹  Antonio R. Cunha¹  Daiane C. Gaia¹ 

[1] ,UNESP Faculdade de Ciências Agronômicas Departamento de Recursos Naturais/Ciências FlorestaisBotucatu SP ,Brasil

关键词: board's cracks;    Eucalyptus grandis;    glass transition temperature;    logs steaming;    rachaduras de tábua;    Eucalyptus grandis;    temperatura de transição vítrea;    vaporização de toras;   

DOI  :  10.1590/S0001-37652010000300025

来源: SciELO

【 摘 要 】

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.

【 授权许可】

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