RESPONSE OF YARN STRENGTH AND REGULARITY TO TWIST IN LONG STAPLE EGYPTIAN COTTON VARIETIES | ||||
| Journal of Plant Production | ||||
| Article 10, Volume 25, Issue 6, June 2000, Page 3167-3176 PDF (607.74 K) | ||||
| Document Type: Original Article | ||||
| DOI: 10.21608/jpp.2000.259112 | ||||
 View on SCiNiTO | ||||
| Authors | ||||
| M. M. Syiam,; M. R. A. Abd-El-Maalk | ||||
| Cotton Research Institute, Agricultural Research Center, Giza Egypt | ||||
| Abstract | ||||
| The newly introduced long staple cotton varieties Giza 89 and Giza 90 and the relatively older Giza 83 were spun at 30s, 40s, 50s and 60s counts , as well as , each count twisted on 3.4, 3.8, 4.2 and 4.6 twist factors to study the response of lea strength and regularity to the increasing of twist. The first degree regression models of linear, logarithmic and power were applied to define the relation between lea strength and twist factors for every individual planned count . The test of significant was according to coefficient of correlation (r).In conformity with the insigniificant relations in derived equations of the above regressions ,the second degree polynomial regression was practiced and derived equations achieved significaut relations.The results showed that lea strength increases on the act of adding twist beyond to 4.2 twist factor and then reduced at 4.6 twist factor within the same count . The optimum twist factor was 4.2 for all spun yarns . Equations which were derived on the basis of the statistical polynomial regression could be applied with considerable accuracy on Giza 83 , Giza 89 and Giza 90 spun yarns at the examined twist factors. Yarn regularity was not significantly affected by increasing twist factor within any one count. | ||||
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