4. What is draw frame?
Draw Frame
Draw frame is a machine for combining and drawing slivers of a textile fiber (as of
hemp for rope manufacture or cotton for spinning). 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.
In drawing slivers are elongated when passing through a group of pair rollers,
each pair is moving faster than previous one.
5. Objectives of draw frame
To straighten the fibers in
the slivers.
To make parallel the fibers
in their sliver axis.
Hooks created in the card
are straightened
through the suction
,intensive dust removal is
achieved
To make perfect blending
of the slivers.
To reduce irregularities of
fiber by doubling and
drafting.
To improve the uniformity
and evenness of the sliver.
6. Task of draw frame
1.Equalizing
2.Parallelizing
3.Blending
4.Dust removal
Actions Involved in Draw Frame
Drafting: It is the process of increasing length per unit weight of sliver. It is mainly
due to peripheral speed of the rollers.
Doubling: The process of combing two or more carded sliver into a single form is
called doubling. In draw frame m/c generally six slivers are fed to convert into one
i.e. six doubling.
Drawing: In the cotton industry the term is applied exclusively to processing on the
draw frame, where the operation is one of doubling and drafting. Drawing= Drafting
+ Doubling.
7. Drafting system
There is many others
drafting system…………..
A short video of drawing
frame
1. 4- over-3 roller drafting arrangement
2. 3-over-3 roller drafting arrangement
3. 3-over-4 roller drafting arrangement
4. 5-over-3 roller drafting arrangement
