What Is Draw Frame / Objects of Draw Frame / Importance of Draw Frame / Operating Principle of Draw Frame

Drawing : 

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.

Object of Draw Frame:
01. To straighten the fibres in the slivers.
02. To make them lie in a manner parallel to their neighbors and to the sliver axis.
03. To improve the uniformity or evenness of the slivers.
04. To remove dust from the sliver.
05. To make perfect blending of the component.

Waste of Draw Frame:
01. Filter waste
02. Clearer waste
03. Sliver cut

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.

Operating Principle of Draw Frame:
Four to eight card or draw frame slivers are fed to the drafting arrangement (3). A feed roller pair (2) above each can (1) 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 (4) via a passage (6) of the tube gear into a can (7), 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 (5).

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