By N. S. Kaplan

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Extra resources for A Practical Guide to Fibre Science

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Fineness denotes the size of the cross-section dimensions of the fibre. AS the cross-sectional features of cotton fibres are irregular, direct determination of the area of croo-section is difficult and laborious. The Index of fineness which is more commonly used is the linear density or weight per unit length of the fibre. The unit in which this quantity is expressed varies in different parts of the world. The common unit used by many countries for cotton is microgrammes per inch and the various airflow instruments developed for measuring fibre fineness are calibrated in this unit.

Productivity A large proportion of short fibre leads to strong fly contamination, strain on personnel, on the machines, on the work room and on the air-conditioning, and also to extreme drafting difficul ties. A uniform yam would have the same no of fibres in the cross-section, at all points along it. If the fibres themeselves have variations within themselves, then the yam will be more irregular. 5% span length of the fibre increases, the yarn strength also icreases due to the fact that there is a greater contribution by the fibre strength for the yam strength in the case of longer fibres.

Immature: (Lumen width "L")/(wall thickness "W") is more than 2 IS About four to eight slides are prepared from each sample and examined. The results are presented as percentage of Mature, half-mature and immature fibres in a sample. 9, it is called as mature cotton There are other techniques for measuring maturity using Micronaire instrument. As the fineness value determined by the Micronaire is dependent both on the intrinsic fineness(perimeter of the fibre) and the maturity, it may be assumed that if the intrinsic fineness is constant then the Micronaire value is a measure of the maturity Dyeing methods Mature and immature fibers differ in their behaviour towards various dyes.

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