Evaluation on manufacturing technique and electromagnetic shielding effectiveness of functional complex fabrics

Modern technology has advanced swiftly, and thus, people have higher and higher demands for functional textiles. In order to have textiles with electromagnetic shielding effectiveness (EMSE) and far infrared emissivity, in this research, we fabricated three types of bamboo charcoal/metal (BC/M) complex yarns with metal wires as the core yarn and bamboo charcoal textured yarn as the wrapped yarns, with a rotor twister machine. Two manufacture parameters for the complex yarns were rotor speed (8000 rpm) and wrapped number of the BC/M complex yarns (4 turns/cm). BC/M complex woven fabrics were made of cotton yarn (warp yarn) and BC/M complex yarns (weft yarns), using a loom machine. The surface resistivities of BC/M complex woven fabrics were first measured. Then, EMSE evaluation was performed to test BC/M complex woven fabrics with different lamination angles. The BC/M complex woven fabrics exhibited higher surface resistivity than other woven fabrics by 1.71 x 10(10 )omega/Sq; and the EMSE was 50-60 dB when the lamination number was 6 at incident frequencies between 1.83 and 3 GHz, which was satisfactory.