Nep Counts AFIS or equivalent, per gram at each point

Neps in the Feed 1/g

Neps in the Sliver 1/g

Neps in the Card Waste 1/g

Flat strips and licker-in droppings combined

Waste & Output The mass each count applies to

Flat Strips %

Licker-in Droppings %

Card Production kg/h

Nep Removal Efficiency

— %

Fall in nep count between feed and delivered sliver

Where the Neps Went

Removed in the Waste: — %
Opened Out by Carding: — %
Neps Entering: — million/kg
Neps Leaving in Sliver: — million/kg
Neps Leaving in Waste: — million/kg
Neps Opened Out: — million/kg
Nep Concentration in Waste: — x
Neps Removed: — million/h

All three nep counts must come from the same instrument and method, normally AFIS, because absolute nep counts are not comparable between measurement techniques - an optical count and a mechanical count on identical material differ by more than the effects being resolved here. The waste count is treated as a single combined figure for flat strips and licker-in droppings; the two differ substantially in nep content, and where the split matters they should be sampled and weighted separately. Seed-coat neps and fibre neps behave differently - the carding action cannot open a seed-coat nep, only remove it - so a material with a high seed-coat fraction will show a low dispersion share for reasons that have nothing to do with the card. The balance assumes steady state, so sample the three streams over the same period and not immediately after a grinding or a setting change.

Card Nep Removal, Dispersion & Residual Index — free, with the formula and a worked example, at Textile School.