Structural Design and Performance Research of a Knitted Flexible Sensor.

Abstract

This paper mainly studies the structure and performance of a smart knitting sensor and selects three kinds, 1 + 1, 2 + 2, and 2 + 1, of fake rib stitches. 70D and 100D silver-plated conductive yarns with a 40D carbon black conductive yarn are knitted into different fabrics in the way of plating. Finally, the related properties of the conductive fabrics of different sizes are studied. This study found that the prepared knitted fabrics can not only meet the requirements of air permeability standards in both the plain needle area and the plated area greatly but also have good elastic recovery. When the number of the plated conductive yarn is the same, the conductivity of the fabric increases with the increase in the conductive yarn wale number, and the smaller the number of plated yarns, the greater the influence of the wale number on the change in conductivity. When the number of plated yarn wales is the same, the conductivity of the fabric decreases with the increase in the conductive yarn course number, and the smaller the wale number, the smaller the effect of the course number on the change in conductivity. When the fabric formed by a silver-plated conductive yarn is in a stretched state, the conductivity decreases. However, the electrical conductivity of the 100D silver-plated fabric is more stable than that of the 70D silver-plated fabric. The conductivity of the carbon black conductive fabric is in the order of MΩ, and the conductivity of the conductive fabric changes greatly and disperses when the conductive fabric is in a stretched state. The conductive stability of the 1 + 1 fake rib stitch samples was the best before washing. On the contrary, the conductive stability of the 2 + 2 fake rib stitch fabrics was relatively good after washing.