Roller drafting system:

Commercially, there are various methods to draft the textile fibrous material like roller drafting system applied at ring spinning, speed frame and draw frames etc, aero dynamic drafting functional at rotor spinning, electro mechanical drafting, frictional drafting, etc. Out of these techniques, roller drafting system is

the most commercially successful one due to its high versatility, simple design and construction, high reliability and can handle variety of fibres and a wide spectrum of count range can be spun.

3/3 roller drafting system at ring spinning

High speed drafting of textile material on 3/3 double apron drafting system and its impact on cots and aprons at ring spinning machine:

Theory:

High speed drafting:

Increasing the delivery speed or productivity of a spinning machine but maintaining the same hank or feed material linear density will proportionately increase the speed of drafting but draft ratio remains constant.

High draft ratio:

Maintaining the same delivery rate or productivity of the spinning frame but reducing the feed hank from finer side to courser side will proportionately increase the draft ratio.