Data/hora: 09/06/2024 11:53:30

Biblioteca(s): | Embrapa Florestas.
Data corrente: | 19/07/2010
Data da última atualização: | 22/03/2011
Autoria: | CRUZ, C. R. da; MUNIZ, G. I. B. de; LIMA, J. T.; FERREIRA, D. F.
Afiliação: | Clair Rogério da Cruz; Graciela Inês Bolzon de Muniz; José Tarcisio Lima; Daniel Furtado Ferreira.
Título: | Application of stress waves to estimate moisture content in Eucalyptus wood.
Ano de publicação: | 2009
Fonte/Imprenta: | Cerne, Lavras. v. 15, n.4, p. 430-438, out./dez. 2009.
Idioma: | Inglês

Conteúdo:

Accurate monitoring of moisture content in Eucalyptus wood during the drying process is critical to improving product
quality. And as electric meters lose accuracy in some moisture ranges, in this work a Stress Wave Timer was used to try and assess
the possibility of estimating wood moisture based on variation in the propagation velocity of stress waves in two Eucalyptus species.
Effects of knot area and board basic density on the propagation of stress waves were also analyzed, using analysis of variance and
observing mean values for these characteristics. Equations were fitted and wood moisture content could be estimated by the stress
wave propagation method using nonlinear models or a multiple linear model, with wave propagation velocity, basic density and knot
area being used as independent variables. Best fits were obtained for boards showing no visible defects (knots, cracks etc.). The
propagation velocity of stress waves through the wood was found to vary as a function of the knot area, wood density and anatomical
orientation (visual analysis) of the boards. Knots had a stronger influence on wave transmission when they were present in radially
cut boards.

Palavras-Chave: | Basic density; Stress wave timer; Wood moisture content.
Thesaurus Nal: | knots.
Categoria do assunto: | --
Registro original: | Embrapa Florestas (CNPF)
Exemplares: | CNPF - (47068-1) - ADD - AP - PP -  -  -  - DIS