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Structural Studies in Continuous-Filament Yarns : Part III: Studies with Fiber Friction as a Variable

Gupta, Bhupender S., Chang, Pei-Tsing
coatings, fabrics, friction, lubricants, lubrication, migratory behavior, nylon, textile fibers, yarns
In this paper the experimental work is extended to the study of the effect of fiber friction on migration behavior, which has been neglected in all past migration studies. The increased importance of this study lies in the fact that friction would be expected to influence only that portion of the total observed migration which results from the actual physical interchange of radial positions. The present study, thus, provided the effective means necessary to check the validity of the earlier conclusions reached concerning the nature and the magnitude of this migration. Fiber-to-fiber friction was varied by coating the nylon 66 filaments with a number of commercially available lubricating agents. In the first stage of the investigation the effect of the concentration of the various lubricants on the coefficient of fiber friction was determined. From these measurements a number of lubricating agents with certain concentrations to give desired values of friction were selected for the second stage—i.e. for final lubrication and twisting of yarns. The twisting apparatus described in Part I was modified to allow for both the lubrication and friction measurements in the first stage and the continuous lubrication and processing of yarns for migration studies in the final stage of investigation. The yarns were made by both the ribbon and the circular form of twisting methods. This study confirmed the earlier finding that in conventional commercial yarns, where a large magnitude of migration is generally observed, the migration which arises due to the actual physical interchange of positions during the process of yarn formation, and which would normally involve surface contacts and rubbing, is expected to be only a small proportion of the total. The major part is expected to be the consequence of the geometric mechanism and the “random” or still “undetermined” causes.