Working of Bi Coiler Drawframe
Tasks of the draw frame
Drafting
Equalizing
Parallelizing
Blending
Dust removal
Drafting
The reduction of weight/yard of sliver and increase in length is called drafting. Or Attenuation of sliver without breaking is called draft.
Break draft: Draft b/w the 2nd and 3rd rollers are called break draft.
Main draft: Draft b/w the 2nd and front rollers are called the main draft.
Objectives of drafting
Straightening of crimped and hooked fibers
Paralleling of fibers
To produce more uniform of sliver of definite wt/yd
To reduce wt/yd of materials fed
To make perfect blending/mixing of the component fibers
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