DOI QR코드

DOI QR Code

Development of a Miller Producing Clean White Embryo Rice Using a Vertical Miller

입형정미기를 이용한 청결배아미 제조기 개발

  • Published : 2004.04.01

Abstract

This study was carried out to develop a miller to produce white embryo rice with functional nutrients by improving the conventional vertical miller. The effects of rice moisture content and the shaft revolution speed of the miller on germ(embryo) adherence rate, whiteness, broken rice rate, and cracked rice rate were investigated. Also, the effect of the mesh size of emery stones on the germ adherence rate was investigated. The vertical prototype miller was improved with the increasement of about 42% in producing white embryo rice at proper conditions(shaft revolution speed of 900 rpm, emery stones of mesh #50, processing capacity of 2.3t/h, zero outlet resistance, rice moisture content of 16.2%). The results were as follows: 1. The germ adherence rate of white rice was significantly influenced by the moisture content of brown rice. The germ adherence rate of white rice decreased rapidly with the increase of the moisture content of brown rice. When brown rice with moisture content of 13.2%, 14.5%, 15.2%, 15.4% was milled by the prototype with emery stones of mesh #35 and shaft speed of 900(1,100) rpm, rpm adherence rate of milled rice was 76.2%(70%), 69.2%(66%), 45.9(38%), 13.0(9%), respectively. 2. The whiteness of white rice milled by the prototype with emery stones of mesh #35 and shaft speed of 1,100(900)rpm increased from 27(23) to about 40, respectively, as the moisture content of brown rice increased from 13.2% to 17.2%. 3. The rate of broken rice of white rice milled at 900rpm decreased by 0.6∼1.0% compared with that at 1,100rpm when the moisture content of brown rice was less than 15.2%. 4. The germ adherence rate was increased by 10.3% and 11.0%, respectively when brown rice with moisture content of 16.2% and 15.5% was milled by the prototype miller with shaft speed of 900rpm and emery stones of mesh #50 instead of mesh #35. 5. Considering the germ adherence rate, broken rice rate, and whiteness of milled rice, the proper milling conditions of the prototype miller for producing embryo rice were the moisture content of about 15%, the processing capacity of 2.3t/h and minimum outlet resistance of 0Nㆍm with shaft speed of 900rpm and emery stones of mesh #50.

References

  1. Hosokawa, A. 1995. Rice Post-Harvest Technology. The Food Agency, Ministry of Agriculture, Forestry and Fisheries, Japan
  2. Park, K. K., D. H. Hong, H. J. Kim, K. D. Nah, S. H. Seo and Y. S. Ha. 2002. Optimum moisture content of paddy for milling process(I) - on the desorption process of paddy -. Proc. of the KSAM 2000 Summer Conference. Vol. 5(2): 170-177
  3. 고학균. 1998. 쌀의 품질과 수확후 처리공정. 한국산업식품공학회 1998 년 심포지엄
  4. 고학균 외 6 명 . 1993. 농산가공기계학. 향문사
  5. 정종훈, 2004. 청결배아미 제조기술, RPC 기술과 경영. 제3호, 한국RPC연구회
  6. Chung, J. H., S. N. Yoo, Y. B. Lee, Y. S. Choi and K. B. Kim. 1997. Development of Rice Mill Machinery for the Production of the Clean and Enriched Rice. Ministry of Agriculture and Forestry
  7. Houston, D. F. 1972. Rice Chemistry and Technology. American Association of Cereal Chemists, INC., Minnesota
  8. Yan, T. Y. and J. H. Chung. 2002. Effects of milling conditions on tyhe adherence of rice germs. Proc. of the KSAM 2002 Winter Conference. Vol. 7(1):289-296
  9. 구득실. 2001. 씻어나온 쌀 개발. 월간식품. 1(2):120 123

Cited by

  1. Milling characteristics of cutting type rice milling machine (I) – Characteristics of milling in accordance with blowing velocity 2018, https://doi.org/10.1016/j.eaef.2017.12.003