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The research is focused on the infl uence of the fi re resistant modacrylic (MAC) fi bres in the ring-spun yarn mixture with cotton (CO) fi bres and of the conductive metal fi bres (MTF) in the ring-spun yarn mixture with polyester (PES) fi bres on the mechanical properties in the region of lower loads. Analysed yarns are intended for the protective clothing production (fi re resistant and electrically conductive clothing). The viscoelastic behavior of yarns in the fi eld of lower loads under the specifi c stress/extension curve which amounts to 5 cN/tex, reaching the weight of 85 g. The results of the research show that the incorporation of MAC fi bres in the yarn from the mixture of 55% MAC/45% CO fi bres increases the region of elastic deformations (the stress and extension in the yield point), on the other side the MAC fi bres in the yarn mixture decrease the elasticity modulus level. The incorporation of MTF (stainless stell) fi bres in the yarn mixture consisting of 75% PES/25% MTF decreases the region of elastic deformations (about 10%), however the region of elastic deformations lies very close to the chosen stress value under the specifi c stress/extension curve – 5 cN/tex or 85 g.

The Influence of Modacrylic and Metal Protective Fibres in the Mixture on the Mechanical Properties of Ring-Spun Yarns for Protective Textiles