Drafting Zone Of Roving/Speed/Simplex Frame Machine
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The presentation discusses the roving frame, an intermediate machine vital for reducing sliver diameter before it reaches the ring frame. Key objectives include drafting, inserting twist into the roving, and winding it onto a bobbin, with focus on three drafting zones: break draft, main draft, and tension draft. Each zone has specific functions that enhance fiber orientation, execute primary drafting, and apply adequate tension to the sliver.
Drafting Zone Of Roving/Speed/Simplex Frame Machine
- 1. Welcome To My Presentation Presentation ON “Drafting Zone Of Roving Frame” Sunday, April 19, 2015 1
- 2. NAME:- ID No. Md. Yousuf Hossain. 120103063 Sunday, April 19, 2015 2
- 3. The roving frame is an intermediate machine between draw frame and ring frame. The main objective of this frame is to change sliver diameter. The draft given at the roving frame reduces the linear density of the drawn sliver into a less thick strand of fibres suitable as an input to the ring frame. Sunday, April 19, 2015 3
- 4. Objects Of Roving Frame- The main objectives of roving frame are- The basic function of the roving frame is attenuation or drafting. To insert small amount of twist into the roving. Wind the roving in a bobbin. Sunday, April 19, 2015 4
- 5. Drafting • Drafting is the reduction of mass per unit length of the sliver. • In this engine the drafting is very high than any of other machine. • The drafting section of the roving frame may be 3 over 3 or 4 over 4 roller arrangement. Sunday, April 19, 2015 5
- 6. Different Parts Of Roving Frame Drafting Zone- Sunday, April 19, 2015 6
- 7. • The bottom roller is used always a steel fluted roller. • While the top roller is covered with some synthetic rubber covering. • The top rollers are pressed down with sufficient force on to the bottom rollers to ensure proper grip of the fibres. Sunday, April 19, 2015 7
- 8. • Three specially designed trumpet guides or condensers are used in the drafting section of the machine. Sunday, April 19, 2015 8 • In the modern roving frames a double apron system is provided at the middle pair of drafting rollers.
- 9. In the roving frame we can witness three drafting zones. 1. Break draft 2. Main draft 3. Tension draft Sunday, April 19, 2015 9
- 10. The draft at the back zone is called as break draft. The main objective of the break draft is to enhance the fiber orientation instead of drafting itself. In main draft the drafting execution take place. But for an optimum draft the fiber orientation is very important factor. Sunday, April 19, 2015 10
- 11. Main draft is the drafting zone where the real drafting is taken place. • In here a draft in high magnitude is taken place. • For good fiber control many methods are used such as aprons, pressure bars. • The total draft is the product of break and main draft. Sunday, April 19, 2015 11
- 12. 3. Tension Draft- • The main objective of the tension draft is to visualize better and adequate tension to the sliver. • In this zone the finer count for the roving frame is already achieved but after freeing from front roller twist has to be inserted. Sunday, April 19, 2015 12
- 13. Fig: Drafting Zone Of A Roving Frame Main Draft Break Draft Tension Draft Sunday, April 19, 2015 13
- 14. Thanks To All Sunday, April 19, 2015 14