Application of a strain gauge to assess drying stresses in normal and tension wood of Corymbia citriodora



Título del documento: Application of a strain gauge to assess drying stresses in normal and tension wood of Corymbia citriodora
Revista: Maderas : ciencia y tecnología
Base de datos:
Número de sistema: 000544834
ISSN: 0718-221X
Autores: 1
1
1
1
Instituciones: 1Universidade Federal de Lavras, Forest Sciences Department, Lavras, Minas Gerais. Brasil
Año:
Volumen: 24
País: Chile
Idioma: Inglés
Resumen en inglés The quantitative evaluation of longitudinal drying strain can provide relevant information for the processing wood and lumber industry, especially with regard to reaction wood in Corymbia, since little has been published. The objective of this work was to evaluate the effect of the steam conditioning and the cooling on the longitudinal drying strain (LDS) obtained from a strain gauge, called extensometer, in boards of both normal and tension wood of Corymbia citriodora. Lumbers 30 mm thick were produced and kiln dried at the initial temperature of 40°C, final temperature of 65°C and drying potential of 2,1. The LDS were measured before and after steam conditioning on hot and cold lumbers. It was observed that the conditioning did not reduce the LDS. Hot lumbers showed higher LDS values than the cold lumbers. The LDS values measured in normal, tension and opposite woods were statistically similar, indicating that the type of wood was not an influential factor in the appearance of longitudinal drying stresses. Extensometer proved to be feasible for measuring LDS, allowing its easy and quick quantification.
Keyword: Casehardening,
Drying strain,
Kiln drying,
Lumber industry,
Reaction wood.
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