Data on linear density, wall thickness, and breaking strength—all measured for individual fibers from five selected cottons—have been examined in detail. It was observed that (i) the variability in single-fiber tenacity, calculated from the above data, is less than that obtained on the basis of average tex, and (ii) breaking load increases with in creasing linear density, up to the average value of linear density for each cotton, and levels off thereafter. The latter result seems to be due to lack of mutual alignment of lamellae in the wall when the fiber is subjected to loading.
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