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 the preparation of feedstock to the comber.
3 - The waste percentage is reduced by achieving the 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 the 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 to the over parallelisation of fibres in the lap sheet. Over degree of parallelisation leads to an increase in the hairiness of the lap.
The thick sheet has a negative effect also. A thick lap sheet develops much load to the comb, thus leading 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 a 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 a percentage. It is mainly of short fibres and naps. The noil is used for the lower count as raw material.
You may also be interested in the following articles:
Process parameters of blow room assembly
Carding process parameters
Draw frame process parameters
Objectives of carding process
Fabric pilling test by Tumble type pilling tester