Otimização da secagem da madeira de Eucalyptus grandis (Hill ex Maiden). / Optimizing the drying proccess of eucalyptus grandis [hill ex maiden] lumber.

AUTOR(ES)
DATA DE PUBLICAÇÃO

2002

RESUMO

The use of Eucalyptus lumber by the wood manufacturing industry is growing, mainly to added value products as furniture and flooring. However, this row material requires a slow drying, which means an increase of production cost, proportional to residence time of lumber in the kiln. To combine air and kiln drying has been suggested as an alternative to reduce the kiln drying time, hypothesis evaluated in this research to optimize the drying of Eucalyptus grandis lumber 40 mm thick. The drying characteristic curve of the material and a basic kiln schedule were determined using laboratory equipment. It was proved that conventional kiln drying is very slow and the best point to interrupt air drying and to start kiln process is when the lumber moisture content is between 35% and 40%. In sequence it was dried a charge with 60 m³ of lumber, starting with air drying in a lumber yard followed by conventional drying using an industrial kiln. Although the green saw wood showed a high incidence of defects before the drying (95% of boards with end checks and 93% with warping), quality evaluation all along drying process permits to conclude that kiln drying caused an increase in the warping intensity but did not affect the incidence as well the intensity of checking and collapse. A 78% reduction in the residence time of lumber in the kiln was obtained (from 70 to 15 days), proving the advantage to combine air and kiln drying.

ASSUNTO(S)

eucalipto madeira serrada otimização optimization wood drying secagem da madeira eucalyptus lumber

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