一种试验型纹杆式胡椒脱粒机由印度泰米尔纳德农业工程学院研制并进行了性能测试。由于脱粒滚筒与凹板之间的间隙比胡椒的平均粒度（5．5mm）稍大一些，只要保持此间隙为6mm即可达到最大脱粒率（84．5％）。该脱粒机生产率为20kg／h，成本为4000卢比。 A pilot-scale grain pepper thresher was developed and conducted by Tamil Nadu Agricultural Engineering Institute in India. Since the gap between the barrel and the concave plate is slightly larger than the average size of the pepper (5.5 mm), the maximum threshing rate (84.5%) can be achieved by maintaining the gap at 6 mm. The thresher productivity of 20kg / h, the cost of 4000 rupees.