Investigation of electromagnetic shielding properties of needle-punched nonwoven fabrics with stainless steel and polyester fiber

Abstract

In this study, electromagnetic shielding properties of needle-punched nonwoven fabrics were investigated. The paper evaluates and compares the electromagnetic shielding of needle-punched nonwoven fabrics produced from stainless steel/polyester and normal polyester fibers. Stainless steel/polyester fiber and normal polyester fiber were blended at specified ratios in the experimental study. Webs were produced from the fibers with the carding machine and then bonded with the needle-punching machines. The thickness and electromagnetic shielding properties of the needle-punched fabrics were tested. An electromagnetic shielding effectiveness (EMSE) device was used for measuring the electromagnetic shielding. The experimental study indicated that as the conductive stainless steel fiber ratio in nonwoven fabrics increases, the EMSE also increases at low, medium and high frequencies. Satisfactory electromagnetic shielding values were obtained at wide bandwidth, i.e. 1200–3000 MHz. The highest EMSE values of the needle-punched nonwoven fabric with 25% conductive steel fiber were, respectively, 6 dB at 0–300 MHz low frequency, 12 dB at 300–1200 MHz medium frequency and 18 dB at 1200–3000 MHz high frequency. It was found that 90% of electromagnetic waves were shielded by nonwoven fabric at high frequencies, 85% at medium frequencies and 80% at low frequencies.

Analyses of the mechanical, electrical and electromagnetic shielding properties of thermoplastic composites doped with conductive nanofillers

“…The shielding effectiveness was determined from (1), which is the ratio of the incident field to that which passes through the material where P 1 (Watts) is received power with the nanocomposite presence and P 2 (Watts) is received power without the nanocomposite presence. The input power used was 0 dB, corresponding to 1 mW [4,31]. (Figure 2(b)).…”

“…The source of the EMI is principally electrical with unwanted electromagnetic emission being radiated or conducted [4].…”

The Influence of Modacrylic and Metal Protective Fibres in the Mixture on the Mechanical Properties of Ring-Spun Yarns for Protective Textiles

“…Metal bres have higher melting point and are more heat resistant than ordinary bres. In addition, they are ame resistant and are used mainly for protective fabrics, carpets, upholstery, work clothing and protective clothing [10][11][12][13][14][15][16][17].…”

Investigation of electromagnetic shielding effectiveness of needle punched nonwoven fabric produced from conductive silver coated staple polyamide fibre

“…Radio frequency (RF) energy is a type of non-ionizing radiation. Although high levels of RF can produce health effects (by heating tissue), exposure to low-level RF may not produce heating effects and causes no known adverse health effects (Erogul et al, 2006;Ozen, Sancak, Beyit, Usta, & Akalin, 2013;Roh, Chi, Kang, & Nam, 2008;Zamanian & Hardiman, 2005).…”

“…EMI shielding efficiency of 1.7-dtex silver-coated staple polyamide fibre(Ozen, Sancak, & Akalin, 2015;Ozen et al, 2013). Thermal analysis of nonwoven fabric produced from silver-coated polyamide fibres.…”