组织结构和密度对导电针织物传感性能的影响

Effects of the fabric structure and density on sensing property of conductive knitted fabrics

为提高导电针织物的传感性能,以涤纶/石墨烯导电复合纱线为导电材料,选择纬平针和1+1罗纹2种织物结构,分别采用3种密度,在电脑横机上编织了6种导电针织物。通过重复拉伸实验,测得织物的电阻—应变关系,分析了组织结构和密度对织物传感性能的影响。结果表明:纬平针织物的电阻随应变的增加先增大后减小,并在5%~25%的应变范围内近似呈线性关系;罗纹织物的电阻随应变先快速增大后趋于稳定,在3%~24%的应变范围内近似呈指数增长关系;罗纹织物的灵敏度、稳定性优于纬平针织物。导电针织物的灵敏度随着密度的增大而增大;但密度过大或过小会降低织物的稳定性;纬平针的重复性随着密度的减小而增大,罗纹的重复性随着密度的减小而减小。

In order to improve the sensing property of conductive knitted fabrics,the polyester/graphene conductive composite yarns were selected as the conductive material to knit six kinds of conductive knitted fabrics by computerized flat knitting machine.The fabrics included two textile structures with three densities for each.The resistance-strain relationship of the fabric was measured by repeated stretching experiment.The effects of structure and density on sensing properties of fabrics were analyzed.The results show that the resistance of single jersey increases at first and then decreases gradually with the increase of strain,and it′s almost linear relationship between them in the strain range of 5%-25%.While,the resistance of rib increases rapidly at the beginning and then tends to be stable with the increase of strain,and it′s an approximate exponential growth between them in the strain range of 3%-24%.The sensitivity and stability of rib are better than those of single jersey.In addition,the sensitivity of conductive knitted fabrics increases with the increase of density,however,the stability reduces when the fabric density is too high or too low.Moreover,the repeat-ability of single jersey increases with the decrease of density,while it of rib decreases.