We can understand the reason behind this difference betbeen yarn qualities to be produced.
Suppose that a yarn of 10 s count is spun with coarse fibres, the number of fibres in cross section area of yarn gets lower than required number of fibres. Thus the low yarn strength results in the yarn. If the number of fibres of cross section area of the yarn gets increased more than required, these fine fibres results in the form of improved yarn strength.
The coarse fibres also results in the form of unevenness. How does it happens? The cotton fibres differ in fineness one to another within the variety. Here more number of fibres of finer fibres always have grater chances to result in the form of improved evenness than the yarn spun with lower number of fibres of coarse fibres.
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