The straighten and parallelizing of fibres and removal of short fibres and impurities by using a comb or combs assisted by brushes and roller. Combing is the process which is used to upgrade the raw material. It influences the following yarn quality:
- Yarn evenness
- Strength
- Cleanness
- Smoothness
- Visual appearance
Objectives of Combing
- Elimination of short fibres
- Elimination of remaining impurities
- Elimination of neps
The basic operation of the comber is to improve the mean length or staple length by removing the short fibres. Since fineness of short fibres (noil) is low, the overall micronaire of the sliver after combing is high.
Because of combing, fibre parallelisation increases. Please note that this is a side effect which is not an advantage always. The high degree of parallelisation might reduce inter-fibre adhesion in the sliver to such an extent that the fibres slide apart while pulled out of the can. This may lead to sliver breaks or false draft.
Combers Noel
The wastage which is removed from the comber m/c during processing is known as comber’s noel. It is expressed as percentage. It is mainly of short fibers and naps. Noel is used for lower count as raw material.
Combing for finer/better yarn
- For finer count, high draft is required but draft irregularity for presence of short fibre. After combing short fibre free product (sliver/roving) is ready for higher draft.
- Longer fibres are finer than shorter fibre. After combing higher count is possible to keep minimum no. of fibre in yarn dia.
Contribution of combing to yarn quality
- Improve the spinning value of fibre.
- Better twist distribution improve the strength of yarn.
- Improve uniformity, smoothness and luster of yarn.
- Reduce yarn hairiness and imperfection.
- Improve Yarn regularity and strength.
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