Operating Principle of Draw Frame

• Feeding of Material: Four to eight card or draw frame sliver can (1) are fed to underneath of creel frame. These slivers are then creeled and fed to the drafting arrangement (3) through a feed roller pair (2), which is located above each, can (1) to enable the feeding in a controlled manner.  

• Drafting of Material: The slivers then run through the drafting arrangement (3) where range of draft of 4 to 12 as required is applied. Here straightening, parallelization and attenuation operation take place. 

• Sliver formation: leaving the drafting arrangement a package of fiber called web, lacking significant cohesion between fibers is produced. In this condition the fibers do not form a transportable intermediate product in order to avoid disintegration of the web.The intermediate transportable product sliver is produced condensing the web immediately after leaving the drafting arrangement.

• Delivery of material: This sliver is then guided through a tube (4) via a passage (6) of the tube [coiler] gear into a can (7), in which it must be laid in clean coils with optimal utilization of the space in the can. To enable the can to take up as much material as possible, the sliver is compressed by passing it through calendaring rollers (or discs) or grooved discs (5).