ISO 2403:2014 pdf download

ISO 2403:2014 pdf download.Textiles — Cotton fibres — Determination of micronaire value
1 Scope
This International Standard specifies a method of determining the micronaire value of loose disorientated cotton fibres taken from bales, laps and slivers, or other sources of lint cotton.
2 Normative references
The following documents, in whole or in part, are normatively referenced in this document and are indispensable for its application. For dated references, only the edition cited applies. For undated references, the latest edition of the referenced document (including any amendments) applies.
ISO 139, Textiles — Standard atmospheres for conditioning and testing
ISO 1130, Textile fibres — Some methods of sampling for testing
3 Terms and definitions
For the purposes of this document, the following terms and definitions apply.
3.1 micronaire value
measure of the air permeability of a mass of cotton under specified conditions, expressed in terms of an arbitrary scale, the so-called micronaire scale
Note 1 to entry: The micronaire scale is based on a range of cottons to which micronaire values have been assigned by international agreement.
4 Principle
Air is passed through a test specimen consisting of a plug of fibres. The permeability is indicated on a scale for recording variations in either the rate of flow through, or the pressure difference across, the plug. The mass and volume of the test specimen are either a constant for a given type of instrument or varied appropriately in relation to each other. The scale indicating variations in permeability can be calibrated in arbitrary units of micronaire value or marked in the appropriate absolute units of rate of flow or of pressure difference and a table or graph provided for conversion of the observed readings into micronaire values.
7 Test Specimen
7.1 Take test specimens in accordance with the instructions given in ISO 1130, or specimens and samples can be drawn in other ways with prior agreement between the parties concerned.
7.2 Remove from the sample foreign bodies such as seed, sand, pieces of stalk, and other impurities. Use a test specimen of the size prescribed for the instrument being used. In instruments having a compression cylinder of fixed volume, weigh the specimen to within ±0,2 % of the specimen size appropriate for the instrument (see Annexes). In instruments having compression cylinders with adjustably varied volume,determine the mass of the specimen with an accuracy of ±0,2 %.
7.3 Test the number of specimens per sample or per lot or shipment, and specify the scheme for the selection of samples, as agreed between the parties concerned.
8 Procedure
8.1 Before each series of measurements, make the necessary preliminary adjustments appropriate to the instrument in use (see Annexes). From time to time, test a minimum of two check specimens from each of three calibration cottons (see Annex A) covering the range of micronaire values of samples to be tested to determine whether or not the instrument is correctly adjusted and is giving results on the
correct level.