Investigation of the technical and physical properties of metal composite 1×1 rib knitted fabrics

Abstract

In this study, it was aimed to determine electromagnetic shielding effectiveness, antibacterial activity, surface resistivityand bending rigidity properties of 1×1 rib knitted fabrics. For this purpose, copper (Cu), stainless steel (SS) and silver(Ag) wires were commingled with two nylon filaments to produce metal composite yarns. 1×1 rib fabrics were producedby these composite yarns. Electromagnetic shielding effectiveness (EMSE), antibacterial activity, surface resistivity andbending rigidity of the composite knits were measured. Electromagnetic shielding measurements of samples wereconducted between 1.0–5.0 GHz frequency. Antibacterial activity test was applied according to AATCC 100 standardagainst K. pneumoniae and S. aureus bacteria. Results showed that knitted fabrics generally have lower SE values than10 dB at wale direction. The double layer samples provide higher EMSE than single layer samples for all metal types.Maximum EMSE value was obtained as 57.12 dB. The use of metal wire significantly reduced surface resistivity ofknitted fabrics. Copper composite knitted fabrics showed 99 % antibacterial activity against both bacterial species. Whencompared to the control sample, the use of metal wire significantly increased the rigidity of the samples.

Electroconductive Polyamide Fibers With Green Synthesized Silver Nanoparticles

“…For example, in the S1 coded yarn, the electrical conductivity was measured as 2.566x10 -3 S/cm in the absence of NaOH, while the electrical conductivity was measured as 2.114x10 -2 S/cm in the presence of NaOH. This increase was evaluated as a result of improved coating homogeneity in the presence of NaOH (Nishimura et al, 2011;İlkan, 2020;Kurt & Çelik, 2020).…”

Influence of Knitting Structure and Metal Wire Amount on Electromagnetic Shielding Effectiveness of Knitted Fabrics

“…The EMSE values were measured for the electric field (30 Hz -6 GHz) and for the magnetic field (10 Hz -1 GHz) using isotropic E-field and H-field probes. Özkan studied the antimicrobial and EMSE properties of metal composite single jersey [18] and 1x1 rib fabrics [19,20]. EMSE of samples was measured according to the free space test method (0.8 -5.2 GHz).…”

“…Örtlek et al [24] examined the EMSE of pique, plain (E28), and double-knit structures (E18) with the shielded box shielding efficiency measurement method (30 MHz -9.93 GHz). Apart from the studies performed with the free space measurement technique [11][12][13][14][15][16][17][18][19][20] and the shielded box shielding efficiency measurement technique [21][22][23][24], there are also studies on EMSE of knitted fabrics performed with the coaxial transmission line technique [11,[25][26][27][28][29][30][31][32][33][34][35][36][37][38][39][40][41][42][43][44]. Knitted fabrics give different EMSE values for each frequency when measured with different measurement techniques and / or different polarizations [11].…”

Electrical properties and electromagnetic shielding effectiveness of cotton/antistatic polyester knitted fabrics treated with antibacterial finish

“…The unwashed fabrics showed very good electrical conductivity, but after repeated washing of two, four and eight washing cycles, the conductivity decreased. In conclusion, from the literature review, it can be stated that there are many methods to obtain electrically conductive and electromagnetic shielding fabrics, such as using yarns made of copper, aluminium, stainless steel, etc., 11–15,21–23 carbon materials, 18,19,21,24 and/or metal nanoparticles, such as cobalt, nickel, aluminium, copper, silver, gold, titanium, and zinc, 3,6,7,10,23,25 or polyaniline and polypyrrole coatings 2–5,20 incorporated in the production of textiles used for technical applications, such as sensors, electrodes, hi-tech shielding fabrics, etc. Therefore, it can be seen that there is a lack of research on the electrical properties of textile fabrics suitable for everyday clothing.…”

“…Metal core yarns are used to achieve high conductivity and electrical properties for technical applications. 8,[12][13][14][15] Despite their very good electrical properties, metal yarn-based fabrics are not considered highly desirable for clothing because of their poor mechanical properties.…”