Abstract:

Moisture unsteady-state diffusion in radial and tangential directions during high temperature drying of Masson pine timber was tested and researched in this paper. The results are as follows: When moisture content above fiber saturation point (F.S.P.), the moisture diffusion coefficients of Maasson pine timber are increasing with moisture content decreasing; when moisture content below F.S.P., the moisture diffusion coefficients of Masson pine timber are decreasing with moisture content decreasing. Radial moisture diffusion coefficients are greater than tangential moisture diffusion coefficients. Moisture diffusion coefficients across grain direction increase with medium temperature increasing and humidity decreasing.

Key words: High temperature drying, Unsteady-state diffusion, Diffusion coefficient