Saturday, May 16, 2015

Combing | Drawing | Roving


Before combing the material, a number of slivers are doubled and drafted in a parallel position to form a ribbon lap as a feeding material on the combing machine. The ribbon lap is then processed on the comber for the removal of short fibers (noil), neps and others impurities.


Drawing is the process of progressively passing or sliding fibers by each other, causing a reduction in the size of the strand, but not breaking its continuity. In processing cotton, the action is obtained by using several pairs of rolls running at speed gradually increasing from back to front.

Purpose of all roller drawing is to straighten the fibers & removing hook point being treated and to reduce the size of the strand, which they compose. The straightening is important because it arranges the fibers more nearly parallel to each other and to the direction of the strand when the fibers are well straightened; the arrangement helps in producing uniform, strong and smooth yarn.


A roving, the product of roving frame, may be defined as a continuous, slightly twisted strand of cotton fibers, which has not received its final reduction. The machine which produces roving takes sliver or other roving and reduces them by roller drawing twisting them slightly as needed, and winds the product accurately in a special form of bobbin.

The purpose of the roving operation is to attenuation drawn the sliver for a suitable size for spinning

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