Abstract:

The various tensile properties of knotted line flax spun yarns have been studied by applying a tensile test for four different structures of knots, namely the square knot, overhand knot, weaver’s knot, and fisherman’s knot. Four types, i.e. 50 tex (A – bleached, B – grey) and 68 tex (C – bleached, D – grey) samples, each spun from line flax, were used for experiment. In this study, the values of breaking force, tenacity, elongation at break, work of break, and specific work of break of the knotted yarns are presented. In addition, the coefficients of retention for the breaking force, elongation at break and work of break are discussed. According to this study, the tensile behaviour of knotted yarns is highly affected by the knot structure. Meanwhile the bleached knotted yarns and the grey knotted yarns exhibited rather similar tensile properties or only small differences were established.