Abstract
Abstract The densities of single poly(ethylene terephthalate)-based commercial fibers from 14 different yarn bobbins were measured to five significant figures. The densities of three of these fibers were also measured after each of three treatments representing two different laundering methods and one outdoor exposure. The density gradient method was found to be a sensitive tool for discrimination among the yarn types when new as well as after each of the three treatments. In addition, the method was able to discriminate among fibers from the same yarn bobbin but which were in each of the four states examined. Density gradient analysis demonstrated little ability to identify the fiber type of an unknown sample. Consequently, the main value of density gradient analysis of fibers clearly lies in its ability to discriminate among fibers of similar origin.
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