Development of Conductive Knitted- Fabric-Reinforced Thermoplastic Composites for Electromagnetic Shielding Applications

Author:

Cheng K. B.1,Ramakrishna S.2,Lee K. C.3

Affiliation:

1. Department of Textile Engineering, National Taipei University of Technology, 1, Sec. 3, Chung Hsiao East Rd., Taipei 106, Taiwan, R. 0. C.

2. Department of Mechanical and Production Engineering, The National University of Singapore, 10 Kent Ridge Crescent, Singapore, 119260

3. Department of Textile Engineering, Chinese Culture University of Technology, 55, Yang Ming San, Hwa Kang Rd., Taipei 111, Taiwan, R. 0. C.

Abstract

This paper presents a feasibility study to develop conductive knitted-fabric-reinforced thermoplastic composites for electromagnetic shielding applications. Polypropylene is the matrix phase, and glass fibers are the reinforcement phase of the composite material. Stainless steel wires and staple yarns are incorporated as conductive fillers to facilitate the electromagnetic shielding properties of the composite material. Owing to their high stiffness, knitting of glass fibers and stainless steel wires is very difficult. To facilitate the knitting, uncommingled yarns comprising stainless steel wires, glass, and polypropylene fibers are produced using a hollow spindle spinning method. Different kinds of weft knitted fabrics are produced, which are subsequently consolidated into composite materials using a compression molding method. The electromagnetic shielding effectiveness (EMSE) of various knitted composites is measured in the frequency range of 300 kHz to 3 GHz. The variations of EMSE of knitted composites with the fabric structure, stitch density, number of plies, and amount of stainless steel are described. The suitability of the knitted composites developed in this study for electromagnetic shielding applications is also discussed.

Publisher

SAGE Publications

Subject

Condensed Matter Physics,Ceramics and Composites

Reference14 articles.

1. 1. Greshham, R. M., 1988, February, EMI/RFI Shielding of Plastics, Plating and Surface Finishing, pp. 63-69.

2. 2. Barry, C., 1989, September, Electroless Copper/Nickel Shielding: High-Performance Solution to Electromagnetic Interference, Plating and Surface Finishing, pp. 30-33.

3. Electrochemical polymerization of pyrrole

4. Studies on processing parameters and thermal stability of ENCF/ABS composites for EMI shielding

5. Effect of compounding on the properties of short fiber reinforced injection moldable thermoplastic composites

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