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A Method for Estimating the Spinning Potential Yarn (SPY) Number for Cotton Spun on the Rotor System

Reiyao Zhu, M. Dean Ethridge


A test for determining spinning potential of cotton fibers on the rotor spinning system is proposed. It is based on the minimum twist required to rotor spin a fixed yarn size. Using known mathematical relationships inherent in the physics of yarn formation, the minimum twist results are transformed into the theoretically finest yarn count that may be spun commercially. The validity of these conclusions is empirically tested and verified on twenty different cotton samples. Implications about the effects of some key fiber properties on rotor spinning performance are clarified.

Reprinted from Proceedings of the 1996 Beltwide Cotton Conferences pp. 1463 - 1467
©National Cotton Council, Memphis TN

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Document last modified Sunday, Dec 6 1998