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KMID : 1024420140180030242
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Food Engineering Progress
2014 Volume.18 No. 3 p.242 ~ p.247
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Development of a Vertical Embryo-Retaining Polished Rice Producing System with Abrasive and Friction Rollers
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Lim Ki-Taek
Kim Jang-Ho
Chung Jong-Hoon
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Abstract
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This research was conducted to enhance a vertical mill producing embryo-retaining polished rice in the 15% moisture content range. A vertical embryo-retaining polished rice producing system with a 1 ton/h capacity was designed and developed. The vertical miller system composed of two vertical millers with abrasive and friction rollers. The effects of the moisture content and shaft speed of the mill on germ (embryo) adherence ratio, whiteness, broken rice ratio, and cracked rice ratio were scrutinized. The influences on germ-adherence ratio and rice quality when processing with a roller type and abrasive stone in the vertical miller were also reported. The prototype miller system could be improved with optimal conditions: shaft revolution speed of 780 rpm and 960 rpm, processing capacity of 600 kg/h, zero outlet resistance, and rice moisture content of 15.2%. The results were as follows. First, the germadherenceratio in the processing of a miller was significantly affected by the moisture content of brown rice. When brown rice with a moisture content of 15.2% was milled by the prototype with sample inputs of 600 kg/h, the germadherenceratio of the milled rice increased by 70%. Secondly, a whiteness test of embryo-retaining polished rice also improved by 35 to 37% when milled with a shaft speed of 960 rpm and 780 rpm and emery stones of mesh No. 38, respectively. Furthermore, the broken rice rate was less than 1% in this system. The optimal milling conditions of the vertical mill were found to be a shaft speed of 780 rpm and 960 rpm, emery stones of mesh No. 38, zero outlet resistance and a milling rate of 600 kg h-1 considering the embryo-adherence ratio, broken rice ratio, and whiteness of the milled rice, thereby producing an energy-saving of 30%.
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KEYWORD
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embryo-retaining polished rice, vertical miller with abrasive and friction rollers, emery stones, embryo adherence rate
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