Objects and operations of ring frame

Objects of Ring Frame

• To draft the roving fed to the ring spinning frame from the speed frame bobbin.
• To insert the necessary amount of twist or turns per unit length.
• To wind the twisted thread or yarn on to a cylindrical bobbin or tube.

Operations involved in the ring spinning frame

The following operations involved in the ring spinning frame –

Drafting: To reduce the wt/yd of the roving being fed to ring frame.

Twisting: Spiraling of the fibres around each other about the vertical axis of the strand so as to build them together to impart sufficient strain to enable it to build up in the form of a suitable package convenient to handle from ring section to the reeling winding section.

Laying out: To put the coils of yarn on the bobbin in regular arrangement.

Winding: To put the successive layers of the yarn on the yarn bobbin at the proper rate of speed.

Building: Gradual lifting of the bobbin rail or shortening of the lift (depending upon the type of building desired) to make conical ends of the full bobbin.

The required characteristics of a yarn produced by the ring frame

The yarn produced by the ring spinning frame should have the following characteristics –

• Uniform diameter and cross-section throughout.
• Uniform weight per unit length.
• Free from any stain and foreign impurities.
• Uniform twist and tensile strength.
• Satisfactory pliability and elasticity for the subsequent operations in weaving, knitting, finishing etc.