Tailings Behavior and Performance of the Tailings Return Unit of the Head-feed Combine(I) -Ratio and Compositions of Tailings-

자탈형(自脱型) 콤바인 환원장치(還元裝置)의 환원물(還元物) 유동현상(流動現象)과 환원성능(還元性能) 개선(改善)에 관한 연구(硏究)(I) -환원율(還元率)과 조성비(組成比)-

This study was undertaken to investigate the ratio and compositions of tailings of the tailings return unit in the commercially available head-feed combines. The ratio of the returned tailings to the sum of the threshed grain and the returned tailings was 2.3~7.2% for various varieties of rice and operational conditions of combines tested and increased as the feeding rate and the cleaning air volume increased. The analysis of the returned tailings showed that the composition of rubbish and short straw was decreased as the feeding rate and the cleaning air volume increased.