Graduate Thesis Or Dissertation
 

Effects of sonic, boiling, and steaming pretreatments on the drying of Pacific madrone

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  • Sonic, boiling, and steaming pretreatments were analyzed to determine their effects on radial and longitudinal liquid permeability, drying rate, and the overall dimensional change of Pacific madrone during kiln drying. Twelve days of drying at temperatures ranging from 110 °F to 140 °F and seven days of equalization were used to dry 1-inch by 1-inch Pacific madrone from green to 12 % MC. A paired comparison t-test showed that two hours of steaming increases the radial permeability of Pacific madrone, while sonic and boiling treatments did not affect permeability. Drying rate was significantly increased after two hours of sonic treatment at 15,400 Hz and also this treatment tended to make permeability and moisture content more homogeneous among the samples. Significant reductions of 33% and 27% were observed on the overall dimensional change after boiling and steaming treatment, respectively, compared to samples dried without pretreatment. Industrial application of a steaming treatment to increase radial permeability and reduce the overall dimensional change would be possible and practical for Pacific madrone. Although a reduction of drying rate occurred after steaming, it could be improved by controlling steam pressure and steam temperature.
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