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Significance and Use
The array method provides objective measurements for determining the fiber length and length distribution in a sample of cotton. The results can be plotted to show the length-weight distribution of all the fibers in the sample. Data obtained from array tests are useful in fiber length research studies, for investigation of changes in fiber length distribution in ginning and mill processing, and for other research purposes.
Upper quartile length is correlated with, but usually longer than, Fibrograph and 2.5 % span length as defined in Test Method D1447. Judgment must be used in making comparisons between length measures from arrays and measures obtained by other methods, which may be basically different.
The coefficient of length variation is a measure of length distribution, or nonuniformity of length. Because the fiber weight-length distribution is usually highly skewed, statistical judgments based on the assumption of normality are not justified.
The array method makes a physical separation of fibers of different lengths. It therefore serves as a standard, or benchmark, with which other methods may be compared and by which their precision and accuracy may be judged.
Test Method D1440 for testing length and length distribution of cotton fibers (array method) is not commonly used for acceptance testing of commercial shipments.
a and c
Note—Other accessories required for length arraying, not shown above, consist of the following: small whisk broom for cleaning velvet surfaces, one pair of tweezers with smooth round tips, forceps similar to b but having tips padded with rubber for laying groups on velvet surfaces, small papers for wrapping groups of fibers (papers 2½ by 3 in. (62 by 75 mm)) with small envelopes for them (2½ by 4¼ in. (62 by 110 mm)), and balances having ranges from 0 to 25 mg and 0 to 100 mg.FIG. 1 Combs and Accessories for Arraying Fibers According to Length
1.1 This test method covers the determination of the fiber length and length distribution in loose cotton fibers.
Note 1—For another method for measuring fiber length, see Test Method D1447.
1.2 This standard does not purport to address all of the safety concerns, if any, associated with its use. It is the responsibility of the user of this standard to establish appropriate safety and health practices and determine the applicability of regulatory limitations prior to use.
2. Referenced Documents (purchase separately) The documents listed below are referenced within the subject standard but are not provided as part of the standard.
D123 Terminology Relating to Textiles
D1441 Practice for Sampling Cotton Fibers for Testing
D1447 Test Method for Length and Length Uniformity of Cotton Fibers by Photoelectric Measurement
D1776 Practice for Conditioning and Testing Textiles
D7139 Terminology for Cotton Fibers
ICS Number Code 59.060.10 (Natural fibres)
UNSPSC Code 11151507(Cotton fibers); 41114721(Fiber length tester)