|Mangialardi G J,|
Submitted to: Cotton Gin and Oil Mill Press
Publication Type: Peer Reviewed Journal
Publication Acceptance Date: October 28, 1995
Publication Date: N/A
Interpretive Summary: Roller gins are used primarily to gin extra long staple cotton varieties such as Pima S-6. They help to preserve the quality factors in lint that are desired by the spinning mill, mainly long fibers with low counts of neps. Experiments were conducted to evaluate the feasibility of roller ginning extra long staple and selected upland varieties grown in the Midsouth and to compare the value and quality of the roller ginned cottons to those processed on a saw-ginning system. The research identifies the relative quality parameters associated with roller ginning and saw ginning. The roller ginned cottons were generally classed one-half to 1-1/2 grades lower than those ginned in the saw ginning plant; but contained longer fibers, fewer neps in the lint, and less imperfections in the spun yarn. Results show that the amount of the U.S. crop that can be expected to be processed on a roller ginning system will depend on prices paid for extra long staple varieties, and on the premiums allowed by spinning mills for certain fiber qualities. Approaches that can make roller ginning of upland varieties more widespread and market acceptable are discussed. These approaches, if adopted, will necessitate a change in the current grading system for upland cotton.
Technical Abstract: The feasibility of roller ginning certain cottons grown in the Midsouth was evaluated in a two year study. The effect of various machines in the process on the cleanliness and quality of the ginned lint was determined, and the market value and quality of the roller-ginned cotton compared to that processed on a saw-ginning system. Three Upland varieties and a Pima ELS (extra long staple) cotton variety were tested. The cottons ginned on the saw gin stand followed by saw-type lint cleaners were generally classed one-half to 1-1/2 grades higher and averaged $21 to $34/bale more in market value when compared to the same cottons ginned on roller gin stands with less aggressive lint cleaners. However, the roller ginned cottons were 1/32 to 1/16-inch longer in staple length and contained 50 percent fewer neps. Roller ginning also gave higher yarn appearance grades and lower numbers of imperfections in yarn for the Pima ELS variety.