The Dielectric Properties of Various Cotton Varieties

Abstract

The use of dielectric measurements of cotton fibers as a method of measuring the mass of a fiber bundle would eliminate the tedious and time-consuming manual operation of weighing the fiber bundle. The dielectric properties of various cotton varieties were measured using several measuring frequencies for ranges of fiber moisture content and sample pack ing density. For a fiber moisture content greater than the equilibrium moisture content at 10% RH, it was found that there is a significant variation in the dielectric properties between varieties of cotton. As the fiber moisture content approaches zero, the variation between varieties diminishes. At zero fiber moisture content, the variation between varie ties becomes insignificant. At zero moisture content, it was found that it is possible to use dielectric measurements as a reliable measure of the mass of a fiber bundle.

Keywords

. KEYWORDS Cottons. Cotton bundles card slivers. Moisture packing density frequencies. Dielectric constant variation dissipation. Dielectric properties. Cotton varieties. Capacitance measuring assembly.

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References

Balls, W.L. , Dielectric Properties of Raw Cotton, Nature 158, 9 11 (1946).

Hearle, J.W.S. , Capacity, Dielectric Constant, and Power Factor of Fiber Assemhlies, Textile Res. J. 24, 307-320 (1954).

Hearle, J.W.S. , The Dielectric Properties of Fiber Assemblies , Textile Res. J. 25, 108-111 (1956).

Kirkwood, C.E. , Jr., Kendrick, N.S. , and Brown, H.M. , Measurement of Dielectric Constant and Dissipation Factor of Raw Cottons, Textile Res. J. 24, 841-847 (1954).

Shaw, T.M. and Windle, J.J. , Microwave Techniques for the Measurement of the Dielectric Constant of Fibers and Films of High Polymers, J. Appl. Phys. 21, 956-961 (1950).

Stoops, W.N. , The Dielectric Properties of Cellulose. J. A mer. Chem. Soc. 56, 1480-1483 (1943 ).

Von Hipple, A. , "Tables of Dielectric Materials," Vols. I, II, III, IV, V, VI Laboratory for Insulation Research, Cam-bridge, Mass., M. I. T., 1943 , 1945, 1950, 1953, 1957 , 1958.