In this study, stainless steel conductive yarns with 500 tex fineness and 14 Ω/m linear resistances were inserted into the reverse side of the knitted fabrics made from acrylic yarns. Six types of knitted fabrics with conductive yarns were produced on an E=7 gauge electronic flat bed knitting machine. Then the electromagnetic shielding efficiency (EMSE) of the sample fabrics were measured in the frequency range of 750 MHz – 3000 MHz. The EMSE variations of the sample fabrics having conductive yarns with respect to fabric structure and polarization type (vertical and horizontal) were also investigated. It was observed that the same samples showed different behaviors and have dissimilar EMSE values in different polarization conditions. When compared to horizontal polarization measurements, the vertical measurement results gave better EMSE values.

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The automotive industry is a major customer of the technical textiles market. In this industry, seat covers are the most important application area of technical textiles. As the customer demands increase and competition among original equipment manufacturers (OEMs) becomes more intense, the test standards for technical textiles are gradually being raised and becoming more thorough. Higher breaking and tearing strengths and breaking elongation are specifications required for advanced seat covers. It is a fact that deficiencies in these specifications have some effect on field returns (the return of failed cars to field service), raising costs and loss of confidence in the product and the producer. This paper investigates breaking and tearing strengths, and breaking elongation performances of the technical textiles used for automobile seat covers. The fabrics used in this research were supplied from seat cover fabric manufacturers who produce these fabrics for multinational automotive companies. The data obtained from the tests are evaluated statistically. The results indicate that flat woven and woven velour seat cover fabrics are the best in terms of breaking and tearing strength performances. Circular knitted automobile seat cover fabrics give the greatest elongation measures.

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