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Abstract
Circular combing of the beard usually removes all neps and vegetable particles from the zone of fibre ends to be detached, and yet some eventually appear in the top. Those which do so are either advanced into the detaching zone by suitable contacts with fibres being detached or are positively detached, as can happen with neps that have a protruding fibre end in the detaching zone. Gripping of the beard by the detaching rollers stretches the wool so that an uncombed length is pulled in front of the top comb before the pins completely penetrate the beard. The neps and vegetable particles in this uncombed length and those left behind near the nipper brush after circular combing form the main source of those found in the combed sliver.
The top comb mainly acts as an impedance to the forward movement of neps and vegetable particles, but for neps it also acts as a sieve, and the effect is dependent on nep size. The number of neps and vegetable particles proceeding to top is inversely dependent on noil setting and to a less extent dependent on feed-gill amplitude. The number and size of vegetable particles in the input material also influence the particle content of the top.