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Ring spinning technology : Development in drafting system

 
By  : Subodh J. Dudheria & Sandeep R. Balar
 

Dept. of Textile Technology
Sarvajanik College Of Engg. & Technology
Affiliated by Veer Narmad South Gujarat
University, Surat (Gujarat).



ABSTRACT


 

Since drafting at Ring Frame is a major influence on yarn qualities & ultimately tells on even fabric appearance, conversion of drafting to upgrade ring frame is a worthwhile exercise. Casablanca drafting represents the first development to improve the control over floating fibres. Drawbacks of this drafting lead to Top Arm drafting thereby preventing slippage of back top roller. Though similar but with further development to ensure provision for varying pressure on top rollers came Second generation Top Arm drafting. Then aroused the need for making changes in top rollers & cots, & now detachable types of top roller with softer cot on front roller are available. Offset drafting & Compact drafting represents the latest development in drafting system at Ring Frame.


INTRODUCTION


Since drafting at Ring Frame is a major influence on yarn qualities & ultimately tells on even fabric appearance, conversion of drafting to upgrade ring frame is a worthwhile exercise.

Among the various components of ring frame, drafting has the maximum influence on yarn quality &ring performance. Drafting at Ring Frame considerably influences not only evenness and appearance of yarn, but also performance of yarn, appearance of fabric, and rejections due to yarn faults. Therefore conversion of drafting is given a high priority in the efforts to upgrade a Ring Frame and the payback from such investments is attractive.


IRREGULARITY IN DRAFTING


Irregularity added in drafting is mainly caused by:

1. Inadequate control over the movement of short and floating fibres.

2. Slippage of strand and fibres under the drafting roller.

3. Variations in speed of drafting rollers.

4. Mechanical faults.

Developments in drafting have therefore focused mainly on reducing the contribution from these factors.


 

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