Structural Studies in Continuous-Filament Yarns

Abstract

One of the major objectives emphasized in this series of papers, of which this is the second, has been to isolate through careful experimentation the contribution made to fiber migration by each of the various sources and to analyze their nature critically. The investigation in this paper is extended to the yarns made by the ideal circular techniques, using yarn size, twist and tension, and tracer position as the main variables. Since the only known mechanism that gives rise to migration in these yarns is the tension-based buckling mechanism, its role and effectiveness in practice is evaluated more objectively. A comparison of the migration results in yarns made by various methods leads to the observation that as much as 75% or more of the migration usually observed in conventional yarns might result from the combination of undetermined and geometric causes, and only 25% or less from the actual physical interchange of positions primarily brought about by the tension differences.