Abstract




 
   

IJE TRANSACTIONS B: Applications Vol. 15, No. 3 (October 2002) 311-318   

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  THE DEVELOPMENT OF A PASSIVE FALSE TWISTER MECHANISM IN HANDLING LOW STRENGTH COTTON SLIVERS ON HIGH DRAFT SPINNING MACHINE
 
S. Shaikhzadeh Najar, Ali. A. A. Jeddi and A. R. Hossainpour

Textile Engineering Department, Amirkabir University of Technology
Tehran, Iran, saeed@cic.aut.ac.ir
 
( Received: April 11, 2001 – Accepted in Revised Form: July 31, 2002 )
 
 

Abstract    A passive false twist unit (spiral) has been developed to assist with the handling lowstrength slivers on a high speed-spinning machine with a high-speed feed. In the first trial, a falsetwist simulator device was constructed to determine whether the passive false twist unit can be usedon high speed feeding with different can distance from the feeding device. In the second trial, theeffects of using one or two false-twist units on rotor spun yarn properties with different draft ratioswere investigated. The experimental results show that the effect of double false-twist unit at 30° entryangle of sliver and two turns of sliver around the false-twist wire is significant on rotor spun yarnproperties. It is also found that to obtain the optimum operating conditions, single or double passivefalse twister units are needed for different conditions including the can distance from feed part anddifferent feed speeds.

 

Keywords    Cotton, Sliver, Passive False Twist, Draft, Strength, Rotor Spinning Machine

 

References   

1. Grosberg, P., “The Strength of Twistless Slivers”, J. Textile Inst., 54, (1963), 223-233.
2. Grosberg, P. and Smith, P. A., “The Strength of Slivers of Relatively Low Twist”, J. Textile Inst., 56, (1965), 15-23.
3. Hossainpour, A. R., “The Development of False Twist Mechanism in Handling Low Strength Cotton Slivers on High Speed Feeding or High Draft”, M.Sc. Thesis (In Persian), Amirkabir University of Technology, (1997).
4. Jeddi, A. A. A. and Oxenham, W., “The Potential of False Twist to Assist in Handling Low Strength Cotton Slivers”, Textile Res. J. , 65, (1995), 423-426.
5. Smith, P. A., “The Effect of Twist on a Worsted Roving”, J. Textile Inst., 53, (1962), 511-528.
6. Tröger, J., “Dissertation Technical University of Chemnitz”,Section Textil-Und Ledertechnik, (1990).
7. Tröger, J., Schlegl, E. and Schwabe, B., “Influence of the Preliminary Drafting factor and the Drafting Unit Speed on the Static and Dynamic Friction Characteristics of Slivers in High Drafting Units”, Melliand Textilber, 74, E3-E6,(1993).






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