Abstract
It is shown that combing rate is very sensitive to changes in setover and insensitive to changes in tear. Tear, of a given wool, depends not only on the setover, but also on the ‘pull-through’; typical values of the latter are given and its variation with setover, punch sliver weight and type of wool investigated. Changes in top fibre length and tear are examined for different lengths of noil removed and it is shown that, though the tear may change considerably, there is only a small change in fibre-length distribution in the top. As a general rule, the number of fibres less than the noil length after combing is about 2/3 of the number before combing. The use of higher punch sliver weights is shown to be advantageous since, at constant input, less noil is lost whilst, at constant setover, higher production is obtained without change of noil loss. In either case, there is very little difference in the properties of the top.
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