N. S. Kaplan's A Practical Guide to Fibre Science PDF

By N. S. Kaplan

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Extra resources for A Practical Guide to Fibre Science

Example text

It may be defined as the upper quartile of a numerical length distribution eliminated by an arbitrary construction. The fibres eliminated are shorter than half the effective length. Modal length It is the most frequently occurring length of the fibres in the sample and it is related to mean and median for skew distributions, as exhibited by fibre length, in the follwing way. (Mode-Mean) = 3(Median-Mean) where, Median is the particular value of length above and below which exactly 50% of the fibres lie.

The slide is then placed on the microscope and examined. Fibres are classed into the following three categories: 1. Mature: (Lumen width "L")/(wall thickness"W") less than 1 2. Half mature: (Lumen width "L")/(wall thickness "W") is less than 2 and more than 1 3. 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.

5% span length 50% span length 32 Textile Technology Mean length It is the estimated quantity which theoretically signifies the arithmetic mean of the length of all the fibres present in a small but representative sample of the cotton. This quantity can be an average according to either number or weight. Upper quartile length It is that value of length for which 75% of all the observed values are lower, and 25% higher. Effective length It is difficult to give a clear scientific definition. It may be defined as the upper quartile of a numerical length distribution eliminated by an arbitrary construction.

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