Abstract:

The investigations of the influence of knit structure, i.e. linear density of yarns, loop length and tightness factor of the knit on garment flammability and permeability to air is presented in this paper. The investigations were carried out using knits from Nomex Delta TA 18 tex × 2 yarns. Four groups of knits knitted from yarns with different linear densities were used in the investigations. A good correlation between the air permeability of the knit and its burning time was found. The investigations show that an increase in the loop length of the fabrics investigated increases their permeability to air, likewise an increase in the linear density of the yarn permeability to air of knits decreases. In addition, it was estimated that the correlation between the tightness factor of the knit and its permeability to air is strong. The same correlation between the tightness factor of the knit and its burning time also exists. Consequently it is possible to predict the burning time of the new designed knit according to its tightness factor.