Woven Fabrics Containing Hybrid Yarns for Shielding Electromagnetic Radiation

Abstract

The aim of the study was to verify whether the construction of a specific hybrid yarn containing a ferromagnetic core and electroconductive wire introduced into woven fabric will improve the shielding effectiveness (SE) in comparison with reference fabrics made of the same raw materials but introduced into woven fabrics as plain wefts, not twisted into the hybrid yarn. Hybrid yarn made of electroconductive materials allows the creation of a set of solenoids with a ferromagnetic core made of steel yarn and a solenoid of conductive effect yarns made of copper. The woven fabric made of these yarns placed into an alternating electromagnetic field (EMF) exhibits a phenomenon where an alternating electric voltage is generated between the ends of the copper solenoid, and alternating magnetisation of the ferromagnetic core takes place. Twelve fabrics were produced, nine of which differed in the density with which the hybrid yarns were introduced as wefts, i.e. once every 25×2 tex cotton yarn, every two cotton yarns, and every three cotton yarns, and the remaining three were reference fabrics, without hybrid yarn. It was found that if measured at a frequency of 30 MHz, the fabrics containing hybrid yarns had 60% higher SE than the reference ones.

Spatial arrangement of stainless steel fibers within hybrid yarns designed for electromagnetic shielding

“…In recent years, the use of conductive coatings on textile substrates has become very popular because of the relatively high electric conductivity, whereby metals [1][2][3] and conductive polymers 4,5 have been used as coatings. There have been many investigations on the properties and preparation of fabrics made of yarns that are blends of extremely thin discrete metal fibers and traditional nonconductive fibers (natural or synthetic), [6][7][8][9][10][11][12][13][14][15] because such blended yarns can uniquely combine the good properties of both fiber components. The usage of fine fibers is favorable for obtaining fabrics with desirable thermo-physiological comfort properties, such as low bending stiffness and good drape, handle, and thermal insulation.…”

Development of technology of utilization of products of ferritization processing of galvanic waste in the composition of alkaline cements

“…Compared to the traditional reagent method of sludge processing [2], the possibilities of utilization of ferritization sludges are significantly expanded. They can be used in the production of soft magnetic high-frequency materials [17], ferromagnetic fabrics [18], as well as radio-absorbing coatings [19], in which the requirements for the ferrite material structure are strictly regulated. The direct use of ferrite sludge in the production of alkaline cements is also promising [20].…”

Investigation on Electromagnetic Interference Properties, Surface Resistivity and

“…The authors stated that the differences of EMSE values of plain and twill fabrics were not statistically significant and the layered structures of fabrics including stainless steel have better shielding effectiveness than the fabrics including copper hybrid yarns in a wider frequency range [8]. Marciniak et al (2016) investigated the effect of pitch of metallic filament coil in hybrid yarn and density of these yarns as weft in woven fabrics on the shielding effectiveness. The hybrid yarns were fabricated by wrapping technique.…”

“…The reference fabrics were produced with the same technique for comparison. They found that the fabrics containing hybrid yarns showed 60% higher SE than the reference ones at 30 MHz frequency [9]. Yu et al (2016b) aimed to improve the comfort properties of multifunctional woven fabrics containing stainless steel wire.…”