PROCESS CONTROL IN COMBER
In combers, the important aspects to be controlled are waste level, combing efficiency and sliver irregularity. Mills generally fix the amount of comber waste to be extracted only by past experience and not on the fiber length distribution of the cottons processed which primarily determines the amount of waste to be removed to achieve the desired fiber length uniformity. Best results of combing of Indian cottons are generally achieved by suitable adjustments of detaching distance, even though the top comb penetration is not very deep. However, the cottons have a high fiber length uniformity but the lap contains too many impurities and neps, a deep penetration of top comb is desirable, without fiber rupture. Mill process all classes of cottons in the same comber without regard to the suitability of the needling arrangement. Coarsening of the needling scheme helps to reduce the comber waste by 2% for coarser cottons and by 1% for finer cottons. Incase of heavier laps, it increases th...