Abstract
The relation between twist and abrasion resistance of rotor yams of cotton, viscose, and acrylics was studied. Contrary to what occurs with other parameters such as tensile resistance and resistance to repeated extensions, for which maximum resistance corresponds to high values of twist for cotton and to quite lower twists for manmade fibers, there is, for abrasion resistance, one tendency in all fibers to yield the highest values of abrasion resistance for the highest twists. Cotton yams of the same linear density and the same relative applied load in conditions of maximum strength present higher values of abrasion resistance than yams of the manmade fibers studied here.
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