41—THE RETRACTION OF TWISTED CONTINUOUS-FILAMENT YARNS

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Abstract
The retraction of continuous-filament yarns is discussed and it is suggested that either filament migration occurs or that the inner filaments are compressed whilst the outer ones are extended. Experimental evidence is cited to show that commercial methods of twisting favour filament migration, while the twisting of short lengths of yarn by a static method may result in a certain degree of filament compression, which manifests itself in the dependence of retraction on tension and the onset of kinking. It is suggested that, in commercial twisting, some compression may occur, but that this is relieved by migration, whilst, in the case of static twisting, fibre migration is less likely to take place.

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