In order to elucidate the relationships between the maturity of cotton fiber and nep formation, the distribution and quantity of immature lint in the raw cotton during the process of cotton-spinning were measured by differential dyeing method.The percentage of the napy substance dyed green by the differential dyeing method in raw cotton and the fineness of these napy substance were measured, and the author pointed out that the origin of the nep formation is due to the immature lint of small fineness.The nep formation from these experimental results is discussed.
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