Experiment Name:
Study on the Jute Slip Draft Spinning frame machine.
Introduction:
The most important features of the spinning process are drafting, twisting and winding on. All jute spinning frames have two sets of rollers extending along the whole length of the machine-the retaining rollers and the drawing rollers. Each of these sets consist of a positively driven member and a pressing member, between which the fibers are gripped. The draft operates in the usual way’ by attenuating the material and reducing its weight. The reach of the frame is as usual, slightly longer than the length of the longest fibers in the material. Situated between the retaining and drawing rollers is a smooth metal plate called the breast plate or slip draft. This plate projects forward slightly from the line joining the nips of the two sets of rollers in order that it may play its proper part in the control of short fiber movement. The twist in the roving, it will be recalled, is of such a magnitude that some degree of cohesion is Spinning imparted to the strand but at the same time movement is not impeded.
To know about surface speed of drawing, retaining r/r and Tin cylinder.
Main Parts:
Retaining roller.
Intermediate roller.
Drawing roller.
Tin cylinder.
Flyer.
Bobbin rail.
General Description:
Machine manufacturer = JAMES MACKIE AND SONS.
Model number = 14376.
No of flyer per frame = 20
Draft range = 10-20
Machine pitch = 4.25″
Flyer speed = 3000-4000 rpm.
Machine specification:
Motor rpm = 1450
Motor pulley diameter = 8.5″
Machine pulley diameter = 11″
Tin cylinder diameter = 6″
Flyer diameter = 2″
TCP = 50T
DCP = 46T
Drawing roller diameter = 2.25″
Retaining roller diameter = 2.5″
Intermediate roller diameter = 1.375″
Gearing diagram of slip drafting spinning frame
Fig: Gearing diagram of slip drafting spinning frame
Calculations:
Result:
Flyer speed = 13361.36
Surface speed of Tin cylinder = 121120.07″/min
Surface speed of drawing r/r = 910.35″/min
Surface speed of retaining r/r = 64.42″/min
Surface speed of intermediate r/r = 83.3″/min
Draft =14.13
Draft constant = 650
Conclusion:
This experiment is very important for us to know and learn about the slip drafting sliver spinning frame. So, we should learn about this experiment very carefully and sincerely.
Founder & Editor of Textile Learner. He is a Textile Consultant, Blogger & Entrepreneur. He is working as a textile consultant in several local and international companies. He is also a contributor of Wikipedia.
