This paper deals with a new device for the evaluation of the dry mass and the moisture content of fiber samples of wool and running yarns or slivers. The device measures the varying dielectric constant simultaneously in high- and low-frequency bands. The contribution of the absorbed water is almost the same in the two bands; contribution of the dry mass, however, differs considerably. The device uses this phenomenon. The apparatus is rather simple and provides sufficient accuracy. The experimental results agree with the theoretical calculations.
AlgieJ. E., Dielectric Constant and Conductance Changes in Wool Fibers Produced by Step Changes in the Relative Humidity, Textile Res. J.34, 477–486 (1964).
2.
AlgieJ. E., The Measurement of Regain of Wool by Electrical Capacity-Type Moisture Meters. Effect of Temperature on the Dielectric Constant on Wool, Textile Res. J.34, 1026–1031 (1964).
HearleJ. W. S., Capacity, Dielectric Constant, and Power Factor of Fiber Assemblies, Textile Res. J.24, 307–321 (1954).
5.
HearleJ. W. S., The Dielectric Properties of Fiber Assemblies, Textile Res. J.26, 108–111 (1956).
6.
HearleJ. W. S., The Electrical Resistance of Textile Materials: Theory, J. Textile Inst.44, T177–T198 (1953).
7.
HearleJ. W. S.MortonW. E., Physical Properties of Textile Fibers, Butterworths, 1962, p. 441.
8.
Von HippelA. B., “Dielectric Materials and Applications, N. Y., Wiley1954.
9.
PeirceF. T., A Two-Phase Theory of the Absorption of Water Vapor by Cotton Cellulose, J. Textile Inst.20, T133–T150 (1929).
10.
RonseW., An Electronic Slub Counter, Ann. Sci. Textiles Belges2, 48–66 (1968).
11.
ShawT. M.WindleJ. J., Microwave Technique for the Measurement of the Dielectric Constant of Fibers and Films of High Polymers, J. Appl. Physics21, 956–961 (1950).
12.
ShawT. M.WindleJ. J., Dielectric Properties of Wool-Water System, J. Chem. Physics25, 435–439 (1956).
13.
SpeakmanJ. B., An analysis of the Water Adsorption Isotherm of Wool, Trans. Faraday Soc.40, 6–10 (1944).
14.
WindleJ. J., Sorption of Water by Wool, J. Polymer Sci.21, 103–111 (1956).
15.
KingG., Electric Polarization in Keratin-Water and Keratin-Methyl Alcohol Systems, Trans. Faraday Soc.43, 601–611 (1947).
