Electromagnetic shielding effectiveness of copper/stainless steel/polyamide fiber co-woven-knitted fabric reinforced polypropylene composites

Copper wire and polyamide filament were used as the core yarn, and stainless steel wire was used as the wrapping yarn to fabricate the loop yarns for knitting structure. The nonwoven selvedge served as the core yarn, and the conducting wire was used as the wrapping yarn, to fabricate the weft-inlaid yarn. The rotor twister successfully fabricated a series of conductive hybrid yarns (CHYs). The co-woven-knitted machine successfully fabricated the conductive co-woven-knitted fabrics (CWKFs) with various CHYs. The conducting materials of the hybrid yarn were copper wire and stainless steel wire, taken as the wrapping and core yarn, respectively. The conductive co-woven-knitted fabrics were laminated with various angles in four and six layers and then heat pressed to 2 and 3 mm in thickness. This study investigated the surface resistivity, electromagnetic shielding effectiveness (EMSE) and electrostatic discharge (ESD) attenuation percentage of the co-woven-knitted fabrics and CWKFs reinforced composites.