Roving Frame in textile|roving frame objective

 Necessity of roving frame

1. The first reason is related to the required draft. Sliver is a thick, untwisted strand that tends to be hairy and to create fly. The draft needed to convert this to a yarn is in the region of 300-500. The drafting arrangements of ring spinning machines, in their current forms, are not capable of processing this strand in a single drafting operation to create a yarn of short-staple fibers that meets all the normal demands on such yarns. The fine , twisted roving is significantly better suited to this purpose. 

 

View of roving frame

 

 

Objects/ Functions of speed frame

1.Attenuation of drawn sliver to form roving of required count by drafting.

2.Insert small amount of twist to give required strength of roving.

3.Wind the twisted roving on to the bobbin.

4.Build the roving in bobbin such a form which will facilitate handling, withdrawing & transfer to the next process.

Operations involved in simplex machine

1.Creeling

2.Drafting

3.Twisting

4.Winding

5.Building

6.Doffing

Creeling 

 To feed the sliver by the help of several rows of driver rollers to the machine.

Creel draft

Creel Stop motion

Block creeling

Drafting

To reduce the wt/unit length of sliver to make it suitable for ring spinning system

Twisting

To insert small amount of twist to give required strength of roving.

Winding

To wind the twisted roving on to bobbin.

Building

To build the roving in bobbin such a form which will facilitate handling, withdrawing & transfer to the next process.

Doffing

To replace an empty bobbin at the place of full roving bobbin.

Manufacturer of speed frame

1. Rieter (Switzerland)

Used in recent spinning mill

2. Toyoda (Japan)(FL-16, FL- 100)

Used most in our country

3. LMW(India)/Laskmi