In the twisting process yarn was exposed to various influences that caused various tensions in various sectors. All that influenced the resulting tension with which yarn was twisted onto the bobbin. Yarn tensions were defined under various twisting conditions. Afterwards, poly-cyclic mechanicalproperties of these yarns were examined. Fastness of twisted yarns to poly-cyclic extensions was examined by the method of repeated extensions to the constant elongation, on INSTRON-tester. Elongation of 4 /100, corresponding to the warp elongation on the loom, was taken. As experimental material, worsted wool yarn spun from T-63 wool fibres was chosen.
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