Kiln dry probes verification for maritime pine and eucalyptus wood

• Author(s): Anjos, O. ; Lousada, J.L. ; Margarido, M. ; Cunha, R.
• Date: 2003
• Persistent ID: http://hdl.handle.net/10400.11/187
• Origin: Repositório Científico do Instituto Politécnico de Castelo Branco
• Subject(s): Maritime pine; eucalyptus; kiln dry; probes; wood moisture content
• Document Type: Conference Object
• Language: English

Description

Comunicação apresentada na 8th International IUFRO Wood Drying Conference, que decorreu de 28 a 29 de Agosto em Brasov na Roménia. Proper technical drying is a condition for processing sawn timber into high quality products. The drying process is a phase with an extreme importance in wood transformation process, because it gives a significant improvement to the characteristics of workability, prevents damage during transport and insects or fungi attack (Tsoumis, 1991; Walker, 1993). One of the most critical and important phases in the kiln dry is the perfect knowledge of moisture evolution in wood that is drying and is given by the probes measures. Therefore, it became necessary estimate frequently the wood moisture content, which should be at the same time accurate and practical. The objective of the present study is to verify the fiability of the data given by different probes types, and between the values given by this and the ones obtains by laboratory. This work was done in 2 different industrial dryers and in a laboratory dryer. There were executed several simple regression analysis to evaluated the existent relation between this ones and the ones obtain in laboratory; it was observed that to values until 30% of moisture it exist a strong correlation between this two parameters but the same it wasn’t observed to higher moisture contents. It was made the confrontation between the result obtain in Maritime pine (Pinus pinaster) and Eucalyptus (Eucaliptus globulus), and it was observed that the probes can evaluated the moisture content with higher accuracy in pine comparing with eucalyptus. So, it is necessary have some caution when the probes are disconnected, during the kiln dry process, specially to moisture content values are higher then 30%, because the values given by them are some times liable to error.