Effects of spike-tooth pattern and louver inclination of an axial flow rice combine harvester on threshing losses

Abstract

The objective of this study was to determine the effect of spike-tooth and louver inclination of an axial flow rice combine harvester on threshing unit losses. Four sets of spike-tooth of 90, 130, 195 and 260 teeth were tested in the field. The increasing of the number of spike-tooth resulted in lower total threshing losses, but higher grain breakage. The spike-tooth of 260 teeth and the louver inclination of 72 degrees were recommended for Chainat 1 rice variety. Applying spike-tooth of 260 teeth to 90 teeth and the louver inclination of 72 degrees to 64 degrees were recommended for Khawdokmali 105 variety with losses no more than 3 %.