Using spandex yarn as the core yarn and PPy/Ag nylon filaments as the wrapping yarns

the single-wrap and double-wrap yarn strain sensors are prepared by textile wrapping. The performance of electrical property is characterized

and the relationship among strain sensing

wrapping method and pre-stretching of the spandex core yarn are explored. The results show that: strain sensor made by PPy/Ag filaments wrapped yarn has good sensing performance

the rate of resistance change can be reached 16%; the high stretchability

its elongation can reach 50%; the double-wrapped yarn resistance is better than the single-wrapped yarn. The double-wrapped yarn resistance is reduced to 49.7%

but the sensitivity of the single-wrapped yarn is higher than double-wrapped yarn; pre-stretching of the core yarn spandex can adjust the resistance of the flexible strain sensor in the single-wrapping mode

but has a small effect on the sensitivity of the yarn sensor.