Abstract




 
   

IJE TRANSACTIONS B: Applications Vol. 15, No. 2 (July 2002) 205-212   

downloaded Downloaded: 84   viewed Viewed: 1836

  THE EFFECT OF PERCENTAGE OF REMAINING HAIR BRED AND AMBIENT RELATIVE HUMIDITY ON ELECTRICAL RESISTANCE OF CASHMERE FIBER
 
 
E. Ekhtiyari

Department of Textile Engineering, Yazd University
Yazd, 89195-741, Iran, eekhtiyari@yazduni.ac.ir


M. Johari

Department of Textile Engineering, Amirkabir University of Technology
Tehran, 15914, Iran, mjohari@aut.ac.ir


M. Abedi

Department of Electrical Engineering, Amirkabir University of Technology
Tehran, 15914, Iran, mabedi@aut.ac.ir

 
 
( Received: January 25, 2001 – Accepted in Revised Form: December 31, 2001 )
 
 

Abstract    Among different types of controlling systems, the ON/OFF digital relative humidity control was used for measuring electrical properties of cashmere fibers to make the ambient relative humidity fixed. To achieve this goal the required hardware and software were designed and fabricated. The electrical resistance of fine and coarse hair cashmere fiber was measured by charge and discharge condenser method using Rothschild static voltmeter type R-4021 made in Germany. Experimental results show that the electrical resistance of the fine under coat fibers is considerably greater than that of the coarse under coat fibers. The difference depends on the breeds. With increasing relative humidity, difference of electrical resistance of fine under coat and coarse outer coat cashmere fiber is decreased.  

 

Keywords    Cashmere, Relative Humidity, Dehairing, Control ON/OFF, Electrical Resistance

 

References   

1.  Algaa, S., Magel, M., "Investigation and Optimization of the Mechanical Dehairing of Unsorted Fibers of Cashmere Goat", Camel and Yak, Melliand Textberichte, 11, (19) 860-865.

2. Couchman, R. C., "The Utilization of A Modified Shirley (Wool Model) In Dehairing Cashmere - Down Samples For Greasy - Yield Testing", J. Text. Inst., 4, (1986), 255-262.

3. Bergen, V. W., "Wool Handbook", New York, USA, Vol. 1, Chapter 5, (1970), 343-365.

4.  Karimi, S., "Identification and Classification of Cashmere Fiber", Textile Industrial, 68, (1998), 54-57.

5. Hearle, J. W. S., Moiton, W. E., "Physical Properties of Textile Fibers", Manchester, Chapter 19, (1986), 481-501.

6. Hearle, J. W. S., Morion, W. E., "Physical Properties of Textile Fibers", Manchester, Chapter 21, (1986) 529-563.

7. Noorpanah, P., "Physical Properties of Textile Fibers", A.K.U. Text. Eng. Dep., Tehran, Iran, (1985), 259-269.

8.  Hearle, J. W. S., "The Electrical Resistance of Textile Materials: I. the Influence of Moisture Content", J. Text. Inst., 44, (1953), T117-T143.

9. Johari, M., Abedi, M., Ekhtiyari, E., "Digital Control of Ambient Relative Humidity for the Measurement of Electrical Resistance of Cashmere Fiber", Textile Science 2000 Conf., Liberec, Czech, (2000).

10. Hearle, J. W. S., Morton, W. E., "Physical Properties of Textile Fibers", Manchester, Chapter 20, (1986), 502-528.

11. Holliday, D., Resnik, R., "Fundamentals of Physics", New York, USA, Chapter 27, (1970), 507-516.

12. Holme, I., Mcintyre, J. E., Shen, Z. I., "Electrostatic Charging of Textiles", Textile Progress, The Textile Institute, Vol. 28, Number 1, (1998), 16-21.

13. Instruction Manual for the Rothschild, Static-Voltmeter R- 4021, Germany, (1986), 12.

14. Wylen, V., John, G., "Fundamental of Thermodynamics", New York, USA, Chapter 9, (1959), 203-209.

15. "Hand Book of American Society of Heating, Refrigerating and Air- Conditioning Engineers", ASHRAE, New York, USA, Section 1, Chapter 6, 6.1 -6.11, (1985).

16. Ogata, K., "Modern Control Engineering", Prantice-Hall International Inc., USA, Second Edition, (1990), 381-385, 592-604.

17. Ogata, K., "Discrete Time Control System", Prentice-Hall International Inc., USA, (1992), 50-81, 281-294, 427-457.

18. American Society for Testing and Materials Method (ASTM), "Standard Specification for Maximum Cashmere Coarse - Hair in Cashmere", Philadelphia, D2817, (1985) 638.

19. American Society for Testing and Materials Method (ASTM), "Standard Test Method for Cashmere Coarse-Hair Content in Cashmere", Philadelphia, D2816, (1985), 634.

20. American Society for Testing and Materials Method (ASTM), "Standard Test Method for Med and Kemp Fibers in Wool and Other Animal Fibers by Microprojection", Philadelphia, D2968, (1985), 640.

21. Hersh, S. P., Montgomery, D. J., "Electrical Resistance Measurements On Fibers And Fiber Assemblies", Textile Res. J., (December 1952), 805-818.

 

 





International Journal of Engineering
E-mail: office@ije.ir
Web Site: http://www.ije.ir