Sheet Resistance of Continuous Filament Nonwoven Fabrics

Author:

Godfrey Thomas1,Maze Benoit2,Senecal Kris1,Yip Pearl1

Affiliation:

1. U.S. Army Natick Soldier RDE Center, Natick, MA UNITED STATES

2. The Nonwovens Institute, NC State University, Raleigh, NC UNITED STATES

Abstract

Two modeling techniques are introduced to predict the sheet resistance of electrically conductive continuous filament nonwoven fabric: a two-dimensional (2–D) discrete filament stochastic resistor network simulation, and a simple analysis using a laminate analogy. The effects of anisotropy and sample size are considered. Results are compared with experiments on a silver coated point bonded nylon nonwoven fabric. For this particular sample, experimental sheet resistance results are significantly under-predicted by the 2–D analytical and simulation approaches where perfect inter-filament bonding is assumed. The utility of the 2–D perfect bonding predictions as an ultimate lower bound on the sheet resistance that may be achieved by extremely well-bonded continuous filament networks is discussed. Simulations of 2–D filament webs with poor inter-filament bonding and moderate anisotropy are shown to agree well with the present experiments. Taken together, the present results suggest that modeling of the in-plane conduction behavior of a general continuous filament nonwoven fabric requires a 3–D structural approach to capture the effect of an appropriate number density of inter-filaments bonds.

Publisher

SAGE Publications

Subject

General Materials Science

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