Analysis of controlling force at the double apron drafting system of ring frame

Abstract

Controlling of floating fibres at the double apron drafting system of ring frame to avoid formation of drafting wave has been analysed. The limitation of existing double apron roller drafting system in controlling the floating fibres has been discussed. The cradle of the drafting system has been modified to achieve higher control ling force towards the front roller nip to execute better control over the floating fibres and lower controlling force away from the front roller nip to reduce the drafting resistance in order to avoid undrafting. The imperfections and total classified yarn faults are lower for the yarn produced using modified cradle without spacer compared to that of normal cradle with least possible thickness spacer.