The impact of humidified rice whitening on the performance of a rice mill in terms of milled-rice recovery and milled-rice quality

Date

1986

Abstract

The experiment was carried out to investigate "the impact of humidified rice whitening on the performance of a rice mill in terms of milled-rice recovery and milled-rice quality". The comparison of results were derived from various milling systems characterized by: firstly, a milling system using an abrasive rice whitener as a single-pass whitener without application of air-cooling and without application of humidified whitening secondly, a double pass whitening system without application of air-cooling prior to the second whitener and without application of water in the second-pass friction type humidifier whitener thirdly, a double pass whitening system with application of air-cooling prior to the second whitener but without application of water in the second-pass friction type humidified whitener fourthly, a double pass whitening system without application of air-cooling prior to the second whitener, but with application of water in the second-pass friction-type humidified whitener and fifthly, a double pass whitening system with application of air-cooling prior to the second whitener, and with application of water in the second-pass friction type humidified whitener. The results showed that the type of application humidified whitening yielded significant improvements in head rice yield and whiteness degree through values of 37.21% and 48.23%, respectively. The results were slightly improved by the application of air-cooling prior to the humidified whitening pass with values of 37.68% and 48.70%, respectively. The total milling recovery at uniform whiteness degree as producing during the 5 milling tests show that there were increments over the recommended standard value, test I, with values of 0.175, 0.22%, 1.33%, and 1.48% derived from test II, test III, test IV and test V respectively. There were no significant difference in the moisture content of milled rice noted on the various milling systems. However, a significant difference was found in the moisture content of bran produced by the humidified whitener with a maximum value of 16.44%. The average value of the moisture content of bran produced as a mixture by the abrasive whitener and by the humidified whitener however was acceptable (14.50%). The moisture content of bran was slightly reduced through the application of air-cooling prior to the second-pass humidified whitening process with a reduction value of 1.22%.

Document Type

Master Thesis

Language

English

LC Subject

Rice--Milling

Location

UPLB Main Library Special Collections Section (USCS)

Call Number

LG 995 1986 A2 S35

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