Effect of structural parameters on air permeability of weft-wise elastic fabric

The permeability of the parachute fabric varies with air impact load and its shape also changes accordingly so as to adjust the volume of air permeability.For meeting the requirements,15 types of weft-wise elastic fabrics of double nylon/spandex core-spun weft with different structural parameters(such as wrapping yarn twist or sett of fabric) were designed.The relationships between the structural parameters and the volume of air permeability of the fabrics were analyzed,and the major factors affecting the air permeability of weft-wise elastic fabrics were determined.It was found that increasing the fabric sett decreases the volume of air permeability of the fabric.The maximum volume of air permeability of weft-wise elastic fabric occurs when the wrapping yarn twist reaches the critical value(1 000 turns/10 cm).