Doubling in Ring Frame | Study on Ring Doubling Frame

Objects:
1) To combine two or more single threads into one.
2) To insert sufficient amount of twist for holding the yarns.
3) To increase strength, smoothness and luster.
4) To reduce hairiness.
5) To make sewing thread.
6) To wind a suitable bobbin.

Main parts:
Creel stand and creel.
Front roller.
Yarn guide.
Ring and ring rail
Tin cylinder.
Traveller.
Thread weight or slip roller.
Lappet Spindle.
Specification:
Motor rpm = 1430
Motor pulley diameter = 6.25²
Machine pulley diameter = 10.25²
Tin cylinder diameter = 10²
Wharve diameter = 1.37²
Cylinder carrier wheel = 24T
TCP carrier wheel = 62T
TCP = 63T
Front roller diameter = 2’’
Calculation:

figure

Gearing diagram of doubling frame:

figure

Figure: gearing diagram of doubling frame.
Result:
1) Spindle speed = 6461.59 rpm
2) Twist constant = 1235.25
3) Front roller delivery = 319.143 inch/min.
4) Existing TPI = 20
5) Production = 14.37 lb/shift/frame.
6) Required TPI = 16.266
7) Required TCP =76.25T

Conclusion:
By this experiment we come to know about various parts and working principle of ring doubling frame. This machine is important for producing double yarn on sewing thread.

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