Effect of Cotton Fiber Bundle Break Elongation and Other Fiber Properties on the Properties of a Coarse and a Medium Singles Yarn

Abstract

Forty-three cottons, varying extensively in fiber properties, were used to show the relationship between cotton fiber properties, particularly fiber bundle break elongation, and the properties of a coarse and medium yarn. In addition, there are presented some practical aspects of a speculative nature based on the results. The cottons were processed into a series of yarns of varying twists. Fiber break elongation, along with five other fiber properties (length, fineness, strength, length variability, and maturity), was correlated with yarn break elongation at twists for maximum skein strength, maximum single strand strength, and at two constant twists (4.00 and 5.00 T.M.).It was found that yarns produced from these cottons varied considerably in strength and elongation at break. Yarn strength and break elongation were found to be directly related for the commercially grown short and medium staple cottons, but the long staple and the experimental, strong-fibered cottons were found to be anomalous in that they produced yarns whose strength was disproportionate to their fiber break elongation.Based on multiple correlation analyses, fiber break elongation ranked first and strength ranked second in importance as contributors to yarn elongation for a 30/1 yarn at twists for maximum strength.Secant modulus (average stiffness) and "toughness" index of fibers and yarns are suggested as quality indices for evaluating processing efficiency. This study also demonstrated the necessity of controlling carefully spinning and other processing conditions in evaluating the elastic properties of cotton yarns.

Moduli of Cotton Fibers and Yarns in Relation to X-Ray Angles

“…This relationship is in agreement with similar results for the 43 cottons [4). However, the two types of cotton now lose their identity.…”

“…Both fiber and bundle groups included cottons with wide ranges in their physical properties. Conventional fiber measurements such as length, maturity, and Micronaire fineness of the ginned cottons as well as the tensile properties of 40 (15/1) and 20 (30/1) tex yarns were available from another investigation [4].…”

“…And, as the secant modulus of bundles has been shown to be important in yarn properties [4], it is reasonable that this modulus of single fibers should be basically related to the same modulus in yarns. Table I presents Significant exceptions are the unusual changes in the secant moduli of Tanguis and Karnak from single filers to bundles.…”

“…Rebenfeld and Virgin have shown a relationship between X-ray angle and single-fiber &dquo;elastic&dquo; modulus i I 11. Fiori et al have correlated the secant modulus of fiber bundles with that of cotton yarns [4]. Progress is being achieved in characterizing cotton fibers and fiber products according to a stress-strain modulus of the material.…”

Performance of neural network algorithms during the prediction of yarn breaking elongation

“…According to Majumdar and Majumdar the impact of fiber length on yarn breaking elongation is listed well behind fiber elongation, length Uniformity index, yellowness, yarn count, reflectance, fiber strength and micronaire. While the effect of different fiber parameters and machine factors on yarn breaking elongation keep on varying from author to author [12][13][14], it is worthy noting that previous researchers [1,9,10,[12][13][14] have used at most eight inputs for the reported yarn breaking elongation prediction models. This could have limited the study of the factors affecting yarn breaking elongation.…”