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CALCULATION IN DRAW FRAME MACHINE
Draw Frame:
Drawframe is a very critical machine in the spinning process. Drawing is the operation by which slivers are blended, doubled and leveled. In short staple spinning the term is only applied to the process at a draw frame.It’s influence on quality, especially on evenness is very big. If drawframe is not set properly, it will also result in drop in yarn strength and yarn elongation at break.The faults in the sliver that come out of drawframe can not be corrected . It will pass into the yarn.
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| Draw Frame Machine |
X gear is a one gear and for the drawing purpose it is separated as two gears.
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| Gearing Diagram of Draw Frame Machine |
Let motor rpm is N
Finding roller rpm according to gear system
Intermediate Drafts
Since the roller diameters are equal in main drafting zone, draft is proportionate to the rollers rpm
Front Roller and Second Roller
Second Roller and Third Roller
Third Roller and Back Roller
In this moment TDC is equal to 40T
So the Total Draft without Tension draft from the Calender rollers
Total Draft = 4.011*1.015*1.485 = 6.046
Calender Roller Draft
Production of Machine per shift of 8 hrs at 85% efficiency where the sliver hank to be 3700 tex
Draft Constant
When TDC is a changeable gear wheel, we get the total draft as
Production Constant:
Production Constant is calculated under motor rpm of Nm, 85% efficiency and C tex of output sliver per hour.
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