Submitted to: National Cotton Council Beltwide Cotton Conference
Publication Type: Proceedings
Publication Acceptance Date: 1/7/1999
Publication Date: N/A
Technical Abstract: An experiment determined the optimum speed of the rotary knife on a roller gin stand. Six treatment levels of rotary knife speed were run: 150, 300, 450, 600, 750, and 900 r/min. (The manufacturer's specification for rotary knife speed is 389 r/min.) There were no significant differences due to treatment on the fiber properties. Overall, fiber strength and elongation by the Stelometer averaged 27.8 g/tex and 6.98%, respectively. Fiber span length and uniformity by the Fibrograph averaged 1.38 in. and 47.5%, respectively. Fiber grade, staple, and micronaire by the USDA-AMS Classing office averaged 2.17, 46.8 32**nd in., and 38.1, respectively. With the exception of linters content, there were no significant differences due to treatment on the seed properties. Overall, foreign matter content of the seed averaged 2.16% and seed grade averaged 114. The 300-r/min treatment had the lowest linters content of 1.67%. Linters content on the 150-4/min treatment was 1.73%, and ranged progressively from 1.83 to 2.88% on the remaining treatments. Ginning rate was significantly different due to treatment; the highest rate occurred on the 300-r/min treatment and was 1.90 bales/hr. The 150-r/min treatment had the lowest ginning rate (1.24 bales/hr). Ginning rate on the 450-through 900-r/min rotary knife treatments ranged decreasingly from 1.83 to 1.31 bales/hr.