Studies on Cotton Crimp

Abstract

The crimp parameters of various cotton samples were measured at four testing cycles with a relaxation period between the second and the third cycles. The recovery co efficients of these parameters were determined. It was found that at a second cycle the immediate recovery coefficients are 70 % for the crimp diameters and 50% for the crimp ratios and uncrimping energies. After a relaxation period of 24 hours, the re coveries become higher—65% for the crimp ratios and uncrimping energies and an almost complete recovery of the crimp diameters. At a fourth cycle, which follows the third one immediately, the results were found to be essentially the same as at the second one. By these results the presence of reversible and irreversible components of the crimp in cotton was indicated and their respective amounts were estimated. The differences between the mean recovery coefficients of the various crimp parameters of all cotton samples were not found to be significant. Typical linear relationships which were found in the first part of this study for the crimp parameters at the first cycle were found for other testing cycles as well. The role of crimp recovery in cotton spinning is discussed.