The study was conducted with the aim of evaluating the influence of knitting pattern, fabric thickness and weight g/m2on the air permeability of weft knitted fabrics woven from PA/spandex yarns. In this study, the authors used 03 fabric samples with Three fabric samples with the same yarn count, the same yarn composition ratio of 85% PA/15% Spandex, but with different weave knitting patterns (basic single, single variable). type, jacquard (basic single, derivation single and jacquard type) were used for experimentation. The experiments included: Fiber density Determining fabric density according to the standard TCVN 5794 - 1994; Fabric weight (g/m2) according to standard TCVN 8042:2009; Fabric thickness according to standard TCVN 5071: 2007; Breathability according to TCVN 5092:2009 standard. Research results showed that: The breathability of the fabric depends on the weave type of knitting pattern, thickness and weight g/m2; The thinner looser the weave knitting between the loops of the fabric, the greater the breathability of the fabric and vice versa; The larger the volume and thickness of the fabric, the more breathable the fabric tends to decrease the less breathable the fabric became.
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