Doubling in Ring Frame | Study on Ring Doubling Frame

Experiment Name: Study on ring doubling frame
1.Spindle speed, front roller delivery.
2.Twist, twist Constant.

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:  

1. Creel stand and creel. 
2. Front roller. 
3. Yarn guide. 
4. Ring and ring rail  
5. Tin cylinder. 
6. Traveller.  
7. Thread weight or slip roller. 
8.  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:

Gearing diagram of doubling frame: 

 

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.

Calculation of Twist, Twist Constant of the Ring Frame

Name of the experiment: Calculation of twist, twist constant of the ring frame.

Objects:
i) To find out twist per inch of the ring frame.
ii) To find out twist constant of the ring frame.

Specification:
Front roller diameter =  1”
Tin cylinder diameter =  10”
Whrave diameter = 1.125”
Twist change pinion = 48T

Gearing diagram:

Figure: gearing diagram for calculating twist and twist constant of ring frame.

Calculation:

Result:
1) TPI= 21
2) Twist constant= 1008

Conclusion:
Ring frame is the final and very important machine for build the yarn onto bobbin in a form suitable for storage, transportation and processing. It is used to twist the drafted strand to form yarn of required count and strength. In this practical we calculate twist, twist constant of the ring frame. By this practical we come to know about the gearing diagram of ring frame. Special thanks to our teacher and his assistance for helping us.

Twist Constant of the Speed Frame / Simplex M/C / Roving Frame Machine | Calculation of Twist, Twist Constant of the Speed Frame Machine

Name of the experiment: Calculation of twist, twist constant of the speed frame machine.

Introduction:
Twist is the spiral turns given to a yarn to increase the strength of the yarn. But in speed frame machine vary small amount of twist is given to the roving to make it able to wound onto a bobbin. For a fibrous material twist is measured by the parameter twist per inch (TPI), twist per centimeter or twist per meter (TPM). For the cotton sample twist is measured by TPI.

In speed frame machines twist per unit is varied with the variation of raw material and its different parameters. This variation of twist is inserted by changing a wheel that is connected with the main driving shaft named twist change pinion (TCP). And the multiply of TCP and TPI, present in a machine is called twist constant. This value is applicable for any required twist with corresponding TCP. So we can find out the required TCP to get a given TPI. The generalize formulae is as below: 

Specification:

• Front roller carrier wheel :80T(A)
• Twist constant change pinion carrier:30T(B)
• Twist constant change pinion:30T(C)
• Twist change pinion:28T(D)
• Sprocket wheel:34T(E)
• Sprocket pinion:36T(F)
• Spindle carrier wheel:40T(G)
• Spindle wheel:22T(H)

GEARING DIAGRAM:

Fig: Gearing diagram of speed frame

Calculation:
 

Result:
Twist per inch TPI → 1.56 
Required TCP → 33 

Conclusion:
Speed frame is the first machine which enables the winding of the fibrous material on to a package. From this machine the fibre gets a circular shape which is very advantageous to be used in ring spinning. So the importance of this machine is very much. In this experiment we indicate different gearing diagram of the twist inserting portion; specify it and calculate twist and twist constant. We found a satisfactory result. So the experiment is a successful one.