Investigation of the Electromagnetic Shielding Effectiveness of Carded and Needle Bonded Nonwoven Fabrics Produced at Different Ratios with Conductive Steel Fibers

Abstract

The number of electrical and electronic devices in our daily life has increased. The devices produce electromagnetic waves which harm human and environments. In recent years, there has been an increasing interest in the reduction and control of electromagnetic waves. The EMSE values such as 20dB, 25dB and 45dB were obtained at low frequency ranges (0-300MHz and 25dB, medium frequency ranges, 300-1200MHz and 45dB, and high frequency ranges, 1200-3000MHz) with the needle punched nonwoven fabric containing 25% conductive stainless steel fiber.

Unprecedented Electromagnetic Shielding Effectiveness of Lightweight Nonwoven Ag/PA66 Fabrics

“…This increase in the conductivity values can be attributed to the higher loading of Ag (18.6 wt%) for 3.3dtex Ag/PA66 fibres as compared to the 12.7wt% for 6.7dtex Ag/PA66 fibres. samples in the 0.15-3.0GHz range, (c) comparison of specific EMSE values of our samples with other reported results of nonwoven fabrics obtained from [7,22,23] The EMSE response of PNNF-3.3 and PNNF-6.7 nonwoven fabrics measured between 0.015-3GHz frequency range are presented in Fig. 5(a).…”

“…The needle punched samples were prepared according to the method described in our previous works [7,22,23]. Briefly, Automatex laboratory type needle punching line, consisting of carding, cross lapper and needle punching machines was used for the production of fabric from staple Ag/PA66 fibres.…”

“…Most of the previous literature in the area has been on the woven and knitted fabrics and composite structures produced from conductive yarns. Only a handful of reports exist on the use of non-woven technologies for the production of EM shielding fabrics, which can provide solutions towards low-weight and high shielding efficacy [7,22,23]. In this work, we demonstrate the use of nonwoven technology to produce high efficiency Ag/PA66 EM shielding fabrics offering unprecedented shielding efficacy over a wide frequency range.…”

Fiber-based structures for electromagnetic shielding – comparison of different materials and textile structures

“…can be obtained. [25][26][27] Further, the incorporation of metal wires (SS, copper) used as the core or shell of yarns offers an interesting solution for the limited amount of applications due to their poor mechanical properties. 28,29 A literature review shows that a number of new fiber-based materials suitable for shielding EM waves have been developed and introduced.…”