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The Impact of Humidified Rice Whitening on the Performance of a Rice Mill in Terms of Milled Rice Recovery and Mille Rice Quality
Thesis Abstract:
The experiment investigated the impact of humidified rice whitening on the performance of a rice mill in terms of milled rice recovery and quality.
Results were derived from various milling systems using an abrasive rice whitener as a single-pass whitener without air cooling prior to the second whitener and without adding water in the second-pass friction-type humified whitener; a double-pass whitening system with air cooling prior to the second whitener, but adding water in the second-pass friction-type humified whitener, and adding water in the second-pass friction-type humifed whitener.
Results showed that the application of humified whitening yielded significant improvements in head yield and whiteness degree at 37.21 percent and 48.23 percent, respectively. The total milling recovery at uniform whiteness degree, as produced during the five milling tests, showed that there were no increments over the recommended standard value (Test 1) at 0.17 percent, 0.22 percent, 1.33 percent, and 1.48 percent derived from Tests II, III, IV, and V, respectively.
There was no significant difference in the moisture content of rice milled using the various milling systems. However, a significant difference was found in the moisture content of bran produced by the humifed whitener with a maximum value of 16.44 percent. The average value of the moisture content of bran produced as a mixture by the abrasive whitener and by the humified whitner, however, was acceptable (14.50%). The moisture content of bran was slightly reduced through air cooling prior to the second-pass humified whitening process with a reduction value of 1.22 percent.
