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Optimum Sieve-slit width for Effective Removal of Immature Kernels based on Varietal Characteristics of Rice to Improve Milling Efficiency  

Lee, Choon-Ki (National Institute of Crop Science, RDA)
Kim, Jung-Tae (National Institute of Crop Science, RDA)
Choi, Yoon-Hee (National Academy of Agricultural Science, RDA)
Lee, Jae-Eun (National Institute of Crop Science, RDA)
Seo, Jong-Ho (National Institute of Crop Science, RDA)
Kim, Mi-Jung (National Institute of Crop Science, RDA)
Jeong, Eung-Gi (Research Policy Bureau, RDA)
Kim, Chung-Kon (National Institute of Crop Science, RDA)
Publication Information
KOREAN JOURNAL OF CROP SCIENCE / v.54, no.4, 2009 , pp. 357-365 More about this Journal
Abstract
On the purpose to improve the milling efficiency as well as head-rice percentage after milling, an experiment to improve the removal ability of immature kernels in the immature brown rice separator (IBRS) was performed focused on varietal characteristics. The removal ability of immature grains by the IBRS was absolutely depending on kernel thickness of brown rice. The kernel thickness of the tested rice varieties distributed from 1.79 mm in Nonganbyeo to 2.16 mm in Daeribbyeo 1. Although there were some variation among rice varieties, it was roughly suggested that the suitable sieve-slit widths for good separation of the immature kernels were 1.9 mm for the varieties thicker than 2.08 mm in thickness, 1.8 mm for the varieties with 2.00-2.08 mm thickness, 1.7 mm for the varieties with 1.90-2.00 mm thickness, and 1.60-1.65 mm for the varieties thinner than 1.7 mm. It was found out that the higher the proportions of immature kernels in brown rice, the more conspicuous the improvement of milling efficiency as well as head rice rates by their removals. With increasing the sieve slit-widths beyond an optimum range, the losses of mature grains increased sharply. For effective separation of immature kernels, it was suggested that the optimum sieve-slit width should be set up depending on both of the kernel thickness and the critical loss limit of mature kernel.
Keywords
Rice; Milling; Brown rice; Immature rice; Head rice; Immature rice separator;
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