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Abstract
It is shown that the twisting of a viscose rayon yarn followed by a subsequent de-twisting produces a reduction in tenacity and extensibility of the constituent filaments, and that the magnitude of this effect is influenced by the type of twisting machine, twisting tension, amount of twist, and the number of times the operation is repeated, but is unaffected by the time for which the yarn remains in the twisted state. It is further shown that this effect is caused by a form of filament-surface damage, which is produced by inter-filament contact.