Bending and Compression Behaviour of Polyester Air-jet-textured and Cotton-yarn Fabrics

Air-jet-textured polyester yarns were produced using two feed yarns differing in filament fineness and number of filaments. By varying the yarn overfeed, filament fineness and air pressure, four textured yarns were produced. Woven fabrics were prepared using these textured yarns as weft and cotton yarns in warp. To study the effect of air-jet-texturing parameters on the bending and compression properties, the woven fabrics were tested for thickness, bending rigidity, hysteresis of bending moment, linearity of compression, compression energy and compression resilience. Statistical significance test was carried out at 99% confidence level to trace out the specific trend followed by the fabrics. Statistical analysis is based on the assumption of normal distribution of dataset. Axial orientation of filaments influences the bending properties and loop density and disposition of loops influences the compression properties. Frictional resistance mostly influences the hysteresis of bending moment. Increase in air pressure during texturing creates turbulence to disturb the axial orientation of the filaments; results in changes in fabric thickness, bending and compressional properties. Fabrics with coarser filament have higher bending rigidity due to higher moment of inertia. Fabrics with fine filaments offer higher compression energy due to the ease of loop formation of finer filaments.