Analysis of Structural Differences between Conventional Multifila- ment Yarns and Microfilament Yarns

Abstract

The structure of conventional multifilament yarns (composed of rather thick filaments) and microfilament yarns is systematically investigated in theoretical way with a task to show the main differences between these two types of yarns. Various structural indices, namely filament linear density, filament diameter, filament lateral area, ratio of filament lateral area to filament volume, ratio of filament lateral area to filament mass, total sum of lateral area of filaments in yarn, number of filaments in yarn, also E.R.Schwarz‘s constant, are discussed in comparable analysis based on simplifying assumptions for these yarns structure. The results of computations of structural indices are presented for polyester (PES) as well as for polyamide (PA) yarns.