Preparation Technique and EMI Shielding Evaluation of Flexible Conductive Composite Fabrics Made by Single and Double Wrapped Yarns

Lou, Ching‐Wen; Li, Ting‐Ting; Hwang, Po-Wen; Chen, An-Pang; Lin, Jia Horng

doi:10.1177/155892501701200410

Cited by 7 publications

(8 citation statements)

References 22 publications

(22 reference statements)

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“…Safarova and Militk� y studied metal content, placement of conductive yarn, moisture content and its relationship with frequency [12]. Lou et al explored that the four-layer conductive composite material was superposed at 0 /90 /0 /90 , and the electromagnetic shielding efficiency was the best, reaching 47.7 dB [13]. Ortlek et al studied the influence of the direction, density and settlement type of conductive wrapped yarn on the electromagnetic shielding performance of fabrics [14].…”

Section: Introductionmentioning

confidence: 99%

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Preparation and evaluation of polyester-cotton/wire blended conductive woven fabrics for electromagnetic shielding

Lou

Liu

Shiu

et al. 2021

Journal of Industrial Textiles

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For the pursuit of conductive textiles with high electromagnetic shielding performance, specified yarns are processed with a special spinning feeding device with twist counts of 40 T, 50 T, 60 T, 70 T, 80 T, and 90 T, for Next, the optimal yarns from each group are made into SS/Pc-70 and Cu/Pc-80 conductive woven fabrics with a plain weave structure design. In addition, the surface resistivity, electromagnetic shielding effectiveness measurement and air permeability of the two conductive woven fabrics were tested and analyzed. Regarding the electromagnetic shielding performance test, the effects of the complete shielding network, the lamination layers of fabric, and lamination angle on the electromagnetic shielding performance are discussed. The test results indicate that Cu/Pc-80 woven fabrics has the lowest surface resistivity, which means it has the best electrical conductivity; Moreover, different types of metal wires provide the conductive fabrics with different levels of surface resistance. The variations in the lamination angles help attain a complete conductive network that significantly enhances the EMSE, and Cu/Pc-80 have a greater average shielding value comparatively and thus greater EMSE. For both types of conductive woven fabrics, one-layered conductive woven fabrics exhibit the maximal air permeability. As the air permeability of conductive woven fabrics is correlated with the thickness of fabrics, the greater the number of lamination layers, the lower the air permeability of the conductive fabrics.

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Section: Introductionmentioning

confidence: 99%

“…Lou et al. explored that the four-layer conductive composite material was superposed at 0°/90°/0°/90°, and the electromagnetic shielding efficiency was the best, reaching 47.7 dB [13]. Ortlek et al.…”

Section: Introductionmentioning

confidence: 99%

Preparation and evaluation of polyester-cotton/wire blended conductive woven fabrics for electromagnetic shielding

Lou

Liu

Shiu

et al. 2021

Journal of Industrial Textiles

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“…However, the protection provided by the wrapped staple fibers on the outer surface of CLCF can reduce the loss of coating during washing, thus maintaining its EMSE. 27…”

Section: Emse Properties Of the Treated Fabricsmentioning

confidence: 99%

Electromagnetic interference shielding characteristics of a core layer-coated fabric with excellent hand-feel characteristics

Yang

Jiang

et al. 2020

Journal of Engineered Fibers and Fabrics

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Electromagnetic shielding fabric (ESF) is a novel electromagnetic shielding product with portability, flexibility, and good mechanical properties. However, the existing ESFs suffer from poor washing fastness of coating and poor comfort performance in terms of hand-feel characteristic. In this study, a core layer-coated yarn (CLCY) was successfully spun using a carboxylic acid-functionalized multi-walled carbon nanotube/polypyrrole/Fe3O4 composite suspension with polyvinyl butyral as an adhesive agent. To better explore the properties, the original fabric and treated fabrics, viz., core layer-coated fabric (CLCF) and surface layer-coated fabric (SLCF), were characterized by several methods. Scanning electron microscopic observations revealed that the coating was on the core layer in CLCF. In addition, the Fourier-transform infrared spectroscopy and X-ray diffraction spectroscopy results revealed that the composition of the coating corresponds with that in the multi-composite suspension. Moreover, the coating of CLCY formed a conductive path with good conductivity in the core layer, but the conductivity of the coating on the surface layer of SLCF deteriorated sharply after washing. Further, compared with the original fabric and SLCF, CLCF has highest breaking strength (after 10 washes), and keeps a relatively good hand-feel characteristic. Finally, the evaluated electromagnetic interference shielding characteristics reveal that the fastness of coating affects the electromagnetic shielding effectiveness, suggesting that the wrapped protection of outside staple fibers in CLCF reduce the loss of coating in the core layer during washing. However, the coating on the surface layer in SLCF could be washed away easily.

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“…As for personal electromagnetic protective gear, the protective clothing makes a good research topic. There are numerous studies indicating that fabrics demonstrate good electromagnetic wave shielding efficacy when composed of stainless steel [7][8][9][10].…”

Section: Introductionmentioning

confidence: 99%

A Study on Highly Effective Electromagnetic Wave Shield Textile Shell Fabrics Made of Point Polyester/Metallic Core-Spun Yarns

Huang

Hsu

et al. 2022

Polymers

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In this study, stainless steel (SS) filaments are wrapped in Ge fibers to form core-spun yarns. The yarns along with 500 D polyester (PET) fibers undergo weaving, thereby forming functional woven fabrics. The experiment is composed of two parts:yarns and fabrics. The yarns are twisted with TPI of 8, 9, 10, 11, and 12, and then tested for tensile strength and tensile elongation. The yarns possess mechanical properties that are dependent on the TPI—the higher the TPI, the better the mechanical properties. The maximal mechanical properties occur when the core-spun yarns are made of 12 TPI where the maximal tensile strength is 5.26 N and the lowest elongation is 43.2%. As for the functional woven fabrics, they are made of Ge/SS core-spun yarns as the weft yarns and 500 D PET yarns as the warp yarns. The tensile strength, tensile elongation, negative ion release, electromagnetic interference shielding effectiveness (EMI SE), and air permeability tests are conducted, determining the optimal woven fabrics. The 12 TPI core-spun yarns provide the woven fabrics with the maximal tensile strength of 153.6 N and the optimal elongation at break of 10.08%. In addition, the woven fabrics made with 8 or 9 TPI core-spun yarns exhibit an optimal EMI SE of 41 dB, an optimal air permeability of 212 cm3/cm2/s, and an optimal release amount of negative ion of 550–600 ions/cc. The proposed woven fabrics have a broad range of applications, such as functional garments and bedding.

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Preparation Technique and EMI Shielding Evaluation of Flexible Conductive Composite Fabrics Made by Single and Double Wrapped Yarns

Cited by 7 publications

References 22 publications

Preparation and evaluation of polyester-cotton/wire blended conductive woven fabrics for electromagnetic shielding

Preparation and evaluation of polyester-cotton/wire blended conductive woven fabrics for electromagnetic shielding

Electromagnetic interference shielding characteristics of a core layer-coated fabric with excellent hand-feel characteristics

A Study on Highly Effective Electromagnetic Wave Shield Textile Shell Fabrics Made of Point Polyester/Metallic Core-Spun Yarns

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