ABSTRACT
Yarns are assemblages or bundles of bers twisted or laid together to form continuous strands. They are produced with either laments or staple bers. Single strands of yarns can be twisted together to form ply or plied yarns, and ply yarns in turn can be twisted together to form cabled yarn or cord. Important yarn characteristics related to behavior are neness (diameter or linear density) and the number of twists per unit length. The measure of neness is commonly referred to as yarn number. Yarn numbering systems are somewhat complex, and they are different for different types of bers. Essentially, they provide a measure of neness in terms of weight per unit or length per unit weight.
