Drafting Zone Of Roving/Speed/Simplex Frame Machine

Welcome To My

Presentation Presentation

ON “Drafting Zone Of Roving Frame”

Sunday, April 19, 2015 1

NAME:- ID No.

Md. Yousuf Hossain. 120103063


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.


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.


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.


Different Parts Of Roving Frame Drafting Zone-


• 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.


• Three specially designed trumpet guides or condensers are used in the drafting section of the machine.


• In the modern roving frames a double apron

system is provided at the middle pair of

drafting rollers.

In the roving frame we can witness

three drafting zones.

1. Break draft

2. Main draft

3. Tension draft


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.


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.


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.


Fig: Drafting Zone Of A Roving Frame

Main

Draft

Break

Draft

Tension

Draft

Sunday, April 19,

2015 13

Thanks To All


Drafting Zone Of Roving/Speed/Simplex Frame Machine

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Transcript of Drafting Zone Of Roving/Speed/Simplex Frame Machine