Preparation And Study On Performences Of Upper Fabric Integrated Knitted Flexible Sensor Based On Double Seamless Knitting Machine

The semi-formed upper fabric made on double seamless knitting machine has the characteristics of excellent wear-resisting and permeability,light weight and softness,and its production efficiency is high and the cost is low,so it is favored by consumers and manufacturers.However,the properties of this knitted upper fabric are rarely discussed,so the knitting,performance testing and later application of the fabric are still to be studied.The knitted flexible sensor is a key factor in the intelligent textile,but it has not been reported that it is applied to the upper fabric by circular knitting machine to monitor the pressure of human feet.Therefore,it will provide a reference for the development of intelligent upper fabric to integrate the fabric produced by double seamless knitting machine with the knitted flexible sensor and investigate its physical and force-electrical performance.This paper mainly deals with the research work in the following aspects.Based on the knitting principle of double seamless knitting machine and the structure characteristics of human foot,five kinds of fabric with different stitches were designed to meet the requirements of vamp functional partition.The fabric with elastic yarn and knitted sensor from conductive fiber,the fabric with elastic yarn and the fabric without elastic yarn were produced.After finishing,three kinds of samples were prepared;they are elastic upper fabric with knitted sensor,the elastic upper fabric of adhesive sensor and the inelastic upper fabric of adhesive sensor.The physical properties of elastic fabric and non-elastic fabric samples were tested and analyzed,and the influences of different structures and whether elastic yarn was added in the fabric properties were explored.The bursting performance of elastic fabric is better than that of non-elastic fabric.The bursting strength order of different fabrics is inlay > interlock > air-layer > small mesh > large mesh.Elastic yarn is added into the fabric to enhance its wear resistance.The wear resistances of mesh fabrics are poor,and holes are easily damaged.The wear resistances of interlock and air-layer fabrics are better.The air permeability of elastic vamp fabric is slightly inferior to that of non-elastic vamp fabric,and air layer and interlock fabric are poor in the air permeability.The pressure-electrical properties of the knitted-sensor elastic vamp fabric,the adhesive-sensor elastic vamp fabric and the adhesive-sensor inelastic vamp fabric were tested,and the influence of the integrated form of the sensor,whether elastic yarn was added or not,and the stitch structure on the pressure-resistance of the fabric was investigated.As the top pressure test is carried out,the fabric pressure increases and the corresponding resistance also increases.The sensitivities of the sensors knitted into the interlock and air layer fabric are higher than those of other sensors,and the sensitivity difference among adhesive sensors is smaller.The pressure order of elastic fabric with knitted sensor is inlay > interlock > small mesh > large mesh > air-layer;the pressure order of elastic fabric with adhesive sensor is inlay > interlock > large mesh > air-layer > small mesh;the pressure order of non-elastic fabric with adhesive sensor is air-layer > large mesh > interlock > inlay > small mesh.The pressure values of non-elastic upper fabrics with different structure are generally lower than those of the elastic upper fabrics.After 15 top pressure tests,the pressure and resistance of the fabric tended to decrease,but the attenuation was related to whether elastic yarn was added or not.