Textile Notes related to fiber, yarn, fabric knowledge, spinning, weaving, processing, projects, knitting, Indian Traditional Textiles and denim manufacturing
Sunday 21 June 2009
The Measures of Fiber Length
The Measures of Fiber Length
1. Mean Length: Numerical Average length of fibres of given population of fibre.
2. Upper Quartile: Length for which 75% of all observed values are lower or 25% higher by weight or number
3. Modal Length: The most frequently occuring length of fiber.
4. Median Length: Length Below and above which 50% of fibres lie.
5. Half Fall Value: The fiber length higher than modal length having half the modal frequency by wt. (Group length longer than mode with frequency equal to 1/2 of mode.)
6. Effective Length: Upper quartile of numerical length distribution from which some of the shortest fibers, having length less than half of effective length are cutailed or eliminated.
7. short fiber %: It is the % of fibers having length less than 1/2 of the effective length value.
8. Uniformity Ratio: Ratio of 50% span length to 2.5 % span length.
9. Span Length: It is the distance that can be spanned by specified percentage of fibers in a test beard.
10. Irregularity: Percentage by weight fo fibers in a sample which are shorter than 3/4th of the mode.
11. Dispersion %: inter quartile range expressed as % of effective length.