Necessity of combing, objectives of combing, Combers Noel
What is Combing?
The Comber removes short fibers that are not good in making fine yarns and a brush cleans the comber and the suction device takes out the short fibers like we clean or combs on a hand towel.
As soon as combing is complete the sheet of web comes over a plate and gets condensed to form a sliver, the pre and post broken sheet of web are joined by a forward and backward moving pair of fluted rollers at the bottom and rubber covered rollers at the top which grip the sheet of fine web which looks like a bridal veil. 8 such Comber segments from one machine and even 16 segments may form a machine known as a double-sided machine.
The short fibers known as comber noils are very clean and they are graded as first-grade waste and may also be used for spinning very course yarns like 6’s and 10’s. The slivers known as combed slivers are fed to a Drawing machine since the combing gets fibers crisscrossed at many places and needs to be made parallel before they are taken to Fly Frames for conversion to go to spinning, a pre-spinning operation.
Objectives of Combing
Following are the objectives of combing process:
- To remove the fiber shorter than a predetermined length.
- To remove remaining impurities in the comber lap.
- To remove naps in the carded sliver.
- To make the fiber more parallel and straight.
- To produce a uniform sliver of required per unit length.
Necessity of combing
The following quality of fibers can only be obtained by combing
- Clean finer fiber
- Uniformity in length of fiber
- Absence of nap
- The more parallel arrangement of fibers
- Straight fibers
Combers Noel: The wastage which is removed from the comber m/c during processing is known as comber’s noel. It is expressed as a percentage. It is mainly
of short fibers and naps. Noel is used for lower count as raw material.
Combing Process
For getting high quality of yarn, one extra process is introduced which is called combing process.Combing is an operation in which dirt and short fibers are removed from sliver lap by following ways.
- In a specially designed jaw, a narrow lap of fiber is firmly gripped across its width
- Closely spaced needles are passed through the fiber projecting from jaws.
Short fiber which we remove is called comber noil. The comber noil can be recycled in the production of carded yarn. The yarn which is got from comber sliver is called comber yarn. Carded sliver are combined into comber lap in a single continuous process stage. The flat sheet of fiber which is got from comber lap is fed into the comber in an intermediate.There are different ways by which value of combing is used in the manufacturing of cotton. By spinning point of view, combing process makes more uniformity in the yarn. The strength of yarn is also high because in combing process short fiber is removed and the only fiber having good strength remains. So it plays very important role in increasing the yarn strength. Because of the straightened condition of fibers combing makes possible spinning smoother and more lustrous yarn. In combing process length of fiber are strong so it needs less twist produced then carded yarn.
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