Study on gearing diagram of a Draw frame Machine.

      YARN MANUFACTURING  TECHNOLOGY LAB-2

Experiment:1

EXP. NAME: Study on gearing diagram of a Drawframe Machine.

Introduction /Theory:

Drawframe  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

It is a process of yarn manufacturing in which the sliver is elongated when passes through pairs of rollers, each pair moving faster than the previous one.This permits combination of several slivers. These slivers are drawn and elongated to straighten and create greater uniformity.There are two types of draw frame

1.    Draw frame -1/Pre-comb drawing/Breaker draw frame

2.    Draw frame -2/Post-comb drawing/Finisher draw frame

Objectives of Draw Frame:

1. To straighten the fibres in the slivers.
2. To make them lie in a manner parallel to their neighbors and to the sliver axis.
3. To improve the uniformity or evenness of the slivers by drafting and doubling.
4. To remove dust from the sliver.
5. To make perfect blending of the component.

            6.  To reduce weight per unit length of sliver.

            7.To blend raw materials of same husk perfectly.  

Importance of Draw Frame:

To parallelization of fiber and blending the carded sliver, draw frame is needed.In carded sliver, fibers are present in hook form i.e. trailing hooks and leading hooks. To parallel these hooks raw frame is used.
Majority of the fiber hooks in a carded sliver are trailing hooks while leading hooks are comparatively less. Trailing hooks are also known as major hooks, while leading hooks are known as minor hooks.

Function of draw-frame:

Carded Slivers are fed into the Draw-Frame and are stretched/Straightened and made in to a single sliver. Also fibre blending can be done at this stage. The cans that contain the sliver are placed along the draw-frame feeder rack, usually including eight pairs of cylinders (each pair is above the space occupied by a can),the lower cylinder is commanded positively, while the upper one rests on the lower one in order to ensure movement of the relative sliver that runs between the two.

Working principle of draw-frame:

Four to eight card or draw frame slivers are fed to the drafting arrangement. A feed roller pair above each can feeds the material without false drafts. The slivers runs into the drafting arrangement, subjected to a draft of 4 to 8 and leave it as a web and condensed into a sliver immediately. This sliver is then guided through a tube via a passage of the tube gear into a can, in which it must be laid in clean coils with optimal utilization of the space in the can by sliver compressing with passing it through calendaring rollers.

Conclusion:

To parallelization of fiber and blending the carded sliver, draw frame is needed.Jute draw frame is very necessary for producing jute drawn sliver. So, we should learn about this experiment very carefully and sincerely. By this Experiment we learn a lot about this Draw frame and get Practical Experience about Operation of this and in front of my view this Practical Experience will help us in our Future job life.