Evaluation of the wearing comfort properties for winter used electromagnetic interference shielding sandwich materials

Abstract

This paper investigates the electromagnetic interference shielding effect and wearing comfort properties of a sandwich material consisting of a surface layer, an electromagnetic interference shielding layer, a thermal insulation layer, and a lining layer. The main aim is to research its potential as a winter jacket’s material for shielding electromagnetic radiation and the relationship between single-layer fabric samples and multi-layer sandwich materials under different properties. Experimentally, it is found that the electromagnetic interference shielding effectiveness of the sandwich materials is only determined by the electromagnetic interference shielding layer fabric sample, the other layers’ fabric samples have no significant impact on the electromagnetic interference shielding effect. In this paper, the air permeability of the sandwich materials is 25 to 50% lower than that of the single-layer fabric samples with the lowest air permeability in their combination. And the water vapor resistance of the sandwich materials is 40 to 60% higher than that of the single-layer fabric samples with the highest water vapor resistance in their combination. The thermal resistances of the sandwich materials measured by the Alambeta are lower than those calculated by the sum of the individual layers’ thermal resistance, which may be caused by the reduction in the internal air of the sandwich materials. Finally, the quality index evaluation is used to select the most suitable sandwich material for the winter jacket against electromagnetic radiation, which achieves the purpose of balancing the electromagnetic interference shielding effect and wearing comfort.

Influence of washability treatment on the electromagnetic interference shielding material’s comfort properties

“…In particular, it can be applied to sandwich materials as the middle layer used in winter clothing. 20 However, it has an obvious technical drawback that the electromagnetic shielding effectiveness of the material is significantly reduced after washing. Figure 1 shows the appearance of Meftex10 and the scanning electron microscope (SEM) picture of Meftex10, and the basic information of Meftex 10 refer to Table 1.…”

Mathematical modeling for electromagnetic shielding effectiveness characterization of metalized nonwoven fabrics

“…33 Notably, metallized nonwovens characterized by high porosity exhibit exceptional suitability as interlayer functional materials for electromagnetic shielding clothing, attributed to their commendable air permeability and lightweight, thin structure. 34,35 Nevertheless, despite the widespread utilization of nonwoven-based metallized electromagnetic shielding textiles, the mathematical modeling of metalized nonwoven fabrics' electromagnetic shielding effectiveness remains an area that has received limited attention. From the literature review, there is rarely no detailed study to solve the mathematical modeling problem for nonwoven metalized fabrics, only in the research of Arthur R. Henn and Richard M. Cribb described the mathematical model for metalized nonwoven fabrics (this model also designed for metalized woven fabrics) but not suitable anymore for the high porosity thin nonwoven fabrics, the compatibility and results accuracy from this model is relatively low.…”

“…33 Notably, metallized nonwovens characterized by high porosity exhibit exceptional suitability as interlayer functional materials for electromagnetic shielding clothing, attributed to their commendable air permeability and lightweight, thin structure. 34,35…”

Washable and breathable ultrathin copper-coated nonwoven polyethylene terephthalate (PET) fabric with chlorinated poly-para-xylylene (parylene-C) encapsulation for electromagnetic interference shielding application

“…These metalized textiles are widely used as fabric for EMI shielding clothing. [11][12][13][14] The carbon-based material also performs high EMI shielding effectiveness (SE) originating from highly conductive carbon fiber, particles, and carbon nanotube (CNT) coating, as well as excellent mechanical strength and flexibility. [15][16][17] The nanostructured MXene/metal oxides integration for textile EMI shielding was also developed for EMI shielding application [18][19][20] but still not widely used for protective clothing.…”