COTTON FIBRE TENSILE STIFFNESS AND TOUGHNESS EFFECTS ON YARN PROPERTIES

Abstract

Forty-three cottons, varying widely in fibre properties, were used to determine the relationships between fibre and yarn tensile stiffness and toughness. The cottons were spun into a series of yarn numbers from 15/1 (40 tex) to 100/1 (6 tex), with a wide range of twists. A grouping of cottons emphasized the relationship between properties not evident when cottons were considered without regard to types. Fibre toughness decreased with fibre stiffness within three groups, but toughness increased with linear density among groups. The grouping influences were less pronounced in fibre-to-yarn than in fibre-to-fibre relationships. Yarn elongation increased with fibre elongation, regardless of yarn number, but this property was unrelated to fibre linear density, length, or tenacity. Appreciable differences in yarn elongation were obtained in any one yarn number as a result of fibre properties, independent of processing variables, and values among yarn numbers overlapped. Fibre stiffness and toughness varied dire...