PARAMETERS OF COMBING PROCESS:
The quality of preparation of feed( lap) greatly affects the performance of the combing process. The man quality parameters of feed ( lap) are given below:
2 - The optimum degree of parallelisation is achieved during preparation of feed stock to the comber.
3 - The waste percentage is reduced by achieving optimum degree of parallelisation.
4 - The over parallelisation of fibres creates problem of lap licking.
5 - The mutual separation of layers within the sheet lowers due to fibre to fibre adhesion force in over parallelised lap sheet.
6 - The retaining capacity of the over parallelised lap sheet is decreased up to great extent. This low retaining capacity of lap sheet, it is not able to hold back the neps as it usually does.
7 - Some of these neps also pass through the top comb. Neppiness of the web is increased.
8 - The sheet does not hold together well due the over parallelisation of fibres in the lap sheet. Over degree of parallelisation leads to increase the hairiness of lap.
Thick sheet has negative effect also. Thick lap sheet develops much load to the comb, thus leads to uncontrolled combing.
The upgraded higher quality of the yarn results in comparison to carded yarn. The noil percentage in this yarn ranges between 5 - 10 %.
It is better quality yarn in comparison to semi - combed yarn. The noil percentage in this yarn ranges between 11 - 20 %.
It is the best quality yarn in comparison to semi combed and normally combed yarn. The noil percentage goes over 20% in this yarn.
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 fibres and naps. The noil is used for lower count as raw material.
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