The Comber Noil Goldmine: Are You Throwing Away Your Profits In The Trash?
The Spinning Veteran’s Perspective
In most mills, the comber is treated as a “set and forget” machine. But as any experienced Textile Engineer knows, the comber is actually the “Heart of Quality.” If your noil percentage is too low, your yarn quality fails. If it is too high, your yarn realization collapses.
1. The “Step-Gauge” Secret
Most technicians set the Top Comb and the Nipper based on the machine manual. However, the manual does not know the Short Fibre Index (SFI) of your current cotton lot.
- The Veteran’s Rule: If your SFI increases by 2%, your index setting must be advanced by at least 0.5 mm to maintain the same yarn U\%.
- The Audit: Check your “Noil Spectrogram.” If you see a chimney at the fibre length frequency, your detaching roller timing is slightly off.
2. The “Fractionating Efficiency” Formula
To truly optimize, you must calculate your Extraction Efficiency.
E = N / S *100
E where E = Efficiency, n = Noil %, and S = Short Fibre % in Lap.
Expert Tip: If E is above 75%, you are likely removing long, “good” fibres. This is a direct loss of profit.
- 3-Point Checklist for the Floor Supervisor
- Brush Condition: Are the brushes “flicking” the waste, or are they embedded? Worn brushes cause “Noil Strips” to jump back into the sliver.
- Lap Preparation: If your Sliver Lap or Unilap has poor “selvedge,” your comber will pull out long fibres at the edges, increasing noil unnecessarily.
- Pressure Bar Settings: Ensure uniform top-roller pressure. Uneven pressure is the #1 cause of “Periodic Faults” in combed yarn.
By Pravin Salokhe, Production Manager, Alok Industries Ltd
