Removing Admixture from Grain of Rapeseed and Sunflower Using a Rotary Size Grader

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  • 回転式粒厚選別機によるナタネ・ヒマワリの夾雑物除去
  • カイテンシキリュウコウ センベツキ ニ ヨル ナタネ ヒマワリ ノ キョウザツブツ ジョキョ

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Abstract

A rotary size grader designed for rice and wheat grain was used to remove admixtures from grain of rapeseed and sunflower before drying. For rapeseed, the grader with a 1.2 mm width hole was applied to remove admixed particles smaller than the grain. It removed 14% of the admixture from a sample with a 4.2% admixture rate with 1.0% grain loss. The grader with a 2.3 mm round hole was applied to remove admixed particles bigger than the grain. It removed 82.9% of admixtures with 17.7% grain loss. The grader with the 2.3 mm width narrow hole removed 53.2% of admixed particles with 0.0% grain loss. For sunflower seeds, the grader hole width to remove the admixture smaller than the grain was necessarily changed between 2.0–2.4 mm according to the grain size, which varies among years, fields, and growing conditions. The grader with a 5.0 mm width narrow hole was applied to remove admixtures bigger than the grain. It removed 15.2–50.4% of admixtures with 6.6–7.7% grain loss. For both grains, the rotary grader can reduce the admixture ratio to less than 1.0%, but it is strongly affected by the original admixture ratio and the purification processing after drying.

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