Varying the number of blades on the roller-gin rotary knife
2004
Armijo, C.B. | Gillum, M.N. | Van Doorn, D.W.
An experiment was run to determine the optimum number of blades and frequency of the rotary knife on a roller gin stand. The knife designs tested included a 2-, 3-, 4-, and 6-blade rotary knife. Each knife design was run at a knife frequency of 14.5, 18.2, 24.2, 36.3, and 72.8 stroke/s. The criteria used for determining the optimum knife design included any damage to the seed or fiber, and differences in carryover and ginning rate. With respect to cottonseed properties, foreign matter content in the seed decreased as knife frequency increased, and seed linters content was highest at the highest knife frequency. With respect to fiber properties, foreign matter content in the lint decreased as the number of blades increased, and increased as the knife frequency increased. Fiber properties such as length, strength, uniformity, short fiber, and nep content were not compromised by either rotary knife design or frequency. Ginning rate was highest at a knife frequency of 36.3 stroke/s. The recommended running frequency for the rotary knife is 36 stroke/s, and ginning with a 3-, 4-, or 6-blade design is acceptable.
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