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  • Roller-type gins

    Chapter 2 - Cotton value addition - Impact of varieties and production practices 

     
     
    Roller-type gins provided the first mechanically aided means of separating lint from seed. Types of roller gins include the Churka, the reciprocating knife and the rotary knife. The ginning rate of the rotary-knife gin is about 20% of the saw-ginning rate per unit of length. Seed cotton conditioning equipment in roller gins is the same type used in saw gins. Lint cleaning in current reciprocating knife roller gins is typically done with cylinder and impact cleaners similar to those used for seed cotton as well as air-jet cleaners. Roller-type gins provided the first mechanically aided means of separating extra long staple cotton lint from seed. The Churka gin, the origin of which is unknown, consisted of two hard rollers that ran together at the same surface speed, pinching the fibre from the seed and producing about two pounds of lint a day. In 1840, Fones McCarthy invented a more efficient roller gin that consisted of a leather ginning roller, a stationary knife held tightly against the roller and a reciprocating knife that pulled the seed from the lint while the lint was held by the roller and stationary knife. A rotary-knife roller gin was developed in the United States in the late 1950s. The roller ginning process does less damage than saw ginning when separating fibre from cottonseed. However, roller ginning is a much slower process.

     
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    Cotton Exporter's Guide

    Brochure - African cotton promotion
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