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Dynamic mechanical properties of commercial nylon, polyester and polypropylene carpet yarns are measured with a Rheovibron, and the tan δ] values are used as a measure of yarn resiliency. The effects of fiber drawing, fiber crimp, yarn structure, yam heat setting, and moisture on yarn resiliency and modulus as measured by the Rheovibron are investigated. In this exploratory study, dynamic mechanical mea surements on carpet pile yarns are compared with carpet appearance retention per formance. Rheovibron measurements of yarn resiliency may be related to carpet ap pearance retention during the initial stages of carpet walkout.

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Roller-drafting causes fibre shear, and the consequential longitudinal migration of short fibres with respect lo long ones leads lo fibre-deblcnding. Furthermore, the drafting of a strand with a varying blend ratio along its length leads to variations in drafting-wave activity along its length. Thus, even with a perfectly autolevelled sliver, variations in blend become translated into irregularily in linear density in later processes. The textile material carries potential errors with it as it passes from one process to the next.Data presented in this paper show quasi-harmonic variations in blend and in fibre properties along the length of slivers, rovings, and yarns. The error wavelengths of the variations were similar to those found in the normal testing of linear density. There is thought to be a connexion.