Objects and Necessity of Combing

Objects of combing

The following are the objects of combing –

• To remove the fibre shorter than a predetermined length so as to enable the spinner to produce finer yarn than that can be spun from the same carded fibber (Sliver).
• To remove remaining impurities in pre-comber lap (such as trashes, dirt and dust etc.) this helps in producing clear yarn.
• To remove neps in the carded fibres (nep is the small knots of entangled fibre).
• To make the fibre more parallel and straight so that the yarn becomes more even and luster.
• To produce a uniform sliver of required weight per unit length and collect it into a can.

Different combing machines name

• Heilman Comber U.K
• Nasmith Comber U.K
• Hartfort Comber U.K
• New model Nasmith Comber U.K
• The Rieter Comber, model E₇
• Bettoni Comber, Model F.B 8/2, Italy
• Ingolstadt, W. Germany
• Hartford Comber, Platt brothers (England)
• Duplex S.A.GM (French)
• Saco-Lowell U.S.A
• Textima Comber, E. Germany
• Whitin, Super J, U.S.A
• Japanee Combers

The difficulties to comb card sliver

In card sliver the fibres are oriented in all directions, the fibres are not straight and there are leading, tailing, and both end hooked fibres. If the hooked fibres are used in comber, the comber needle catches the hooked fibres and breakage occurs. Thus increase the waste percentage.

Longer fibre for irregular alignment may go with the wastage. In the same way, hooked and crimped fibres may also go with the waste. Moreover, hooked, crimped and oriented fibres may create irregularity in the sliver.

Necessity of Combing

Combing is necessary for quality product. The essential requirement to produce quality yarn are-

• Clean fibre i.e. free from impurities.
• Uniformity in length of fibre.
• Absence of neps.
• Absence of short fibres.
• More parallel alignment of fibres and
• Straight fibres.

The above quality of fibres can only be obtained by combing. In combing process short fibres, neps and trash content are removed by cylinder comb, and top comb. Here the fibre also become straight and parallel to some extent. Further parallelization of the fibres is achieved by the machine. So, combing is essential for quality products.