BS ISO 2403-2014 Textiles Cotton fibres Determination of micronaire value《纺织品 棉纤维 马克隆尼值的测定》.pdf

1、BSI Standards PublicationBS ISO 2403:2014Textiles Cotton fibres Determination of micronairevalueBS ISO 2403:2014 BRITISH STANDARDNational forewordThis British Standard is the UK implementation of ISO 2403:2014.The UK participation in its preparation was entrusted to TechnicalCommittee TCI/24, Physic

2、al testing of textiles.A list of organizations represented on this committee can beobtained on request to its secretary.This publication does not purport to include all the necessaryprovisions of a contract. Users are responsible for its correctapplication. The British Standards Institution 2014. Pu

3、blished by BSI StandardsLimited 2014ISBN 978 0 580 69630 5ICS 59.060.10Compliance with a British Standard cannot confer immunity fromlegal obligations.This British Standard was published under the authority of theStandards Policy and Strategy Committee on 28 February 2014.Amendments issued since pub

4、licationDate Text affectedBS ISO 2403:2014 ISO 2014Textiles Cotton fibres Determination of micronaire valueTextiles Fibres de coton Dtermination de lindice micronaireINTERNATIONAL STANDARDISO2403Second edition2014-02-01Reference numberISO 2403:2014(E)BS ISO 2403:2014ISO 2403:2014(E)ii ISO 2014 All r

5、ights reservedCOPYRIGHT PROTECTED DOCUMENT ISO 2014All rights reserved. Unless otherwise specified, no part of this publication may be reproduced or utilized otherwise in any form or by any means, electronic or mechanical, including photocopying, or posting on the internet or an intranet, without pr

6、ior written permission. Permission can be requested from either ISO at the address below or ISOs member body in the country of the requester.ISO copyright officeCase postale 56 CH-1211 Geneva 20Tel. + 41 22 749 01 11Fax + 41 22 749 09 47E-mail copyrightiso.orgWeb www.iso.orgPublished in SwitzerlandB

7、S ISO 2403:2014ISO 2403:2014(E) ISO 2014 All rights reserved iiiContents PageForeword iv1 Scope . 12 Normative references 13 Terms and definitions . 14 Principle 15 Apparatus and materials 16 Atmosphere for conditioning and testing 27 Test Specimen 28 Procedure. 29 Calculation and expression of resu

8、lts . 310 Test report . 3Annex A (informative) Method of calibration of instruments 4Annex B (informative) Operation of the micronaire airflow instruments 5Annex C (informative) Operation of the Wira Fineness Meter (Cotton Model) 7BS ISO 2403:2014ISO 2403:2014(E)ForewordISO (the International Organi

9、zation for Standardization) is a worldwide federation of national standards bodies (ISO member bodies). The work of preparing International Standards is normally carried out through ISO technical committees. Each member body interested in a subject for which a technical committee has been establishe

10、d has the right to be represented on that committee. International organizations, governmental and non-governmental, in liaison with ISO, also take part in the work. ISO collaborates closely with the International Electrotechnical Commission (IEC) on all matters of electrotechnical standardization.T

11、he procedures used to develop this document and those intended for its further maintenance are described in the ISO/IEC Directives, Part 1. In particular the different approval criteria needed for the different types of ISO documents should be noted. This document was drafted in accordance with the

12、editorial rules of the ISO/IEC Directives, Part 2 (see www.iso.org/directives).Attention is drawn to the possibility that some of the elements of this document may be the subject of patent rights. ISO shall not be held responsible for identifying any or all such patent rights. Details of any patent

13、rights identified during the development of the document will be in the Introduction and/or on the ISO list of patent declarations received (see www.iso.org/patents).Any trade name used in this document is information given for the convenience of users and does not constitute an endorsement.For an e

14、xplanation on the meaning of ISO specific terms and expressions related to conformity assessment, as well as information about ISOs adherence to the WTO principles in the Technical Barriers to Trade (TBT) see the following URL: Foreword - Supplementary informationThe committee responsible for this d

15、ocument is ISO/TC 38, Textiles, Subcommittee SC 23, Fibres and yarns.This second edition of ISO 2403 cancels and replaces the first edition (ISO 2403:1972), which has been technically revised.iv ISO 2014 All rights reservedBS ISO 2403:2014INTERNATIONAL STANDARD ISO 2403:2014(E)Textiles Cotton fibres

16、 Determination of micronaire value1 ScopeThis 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 referencesThe following documents, in whole or in part, are

17、 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 a

18、nd testingISO 1130, Textile fibres Some methods of sampling for testing3 Terms and definitionsFor the purposes of this document, the following terms and definitions apply.3.1micronaire valuemeasure of the air permeability of a mass of cotton under specified conditions, expressed in terms of an arbit

19、rary scale, the so-called micronaire scaleNote 1 to entry: The micronaire scale is based on a range of cottons to which micronaire values have been assigned by international agreement.4 PrincipleAir is passed through a test specimen consisting of a plug of fibres. The permeability is indicated on a

20、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 permeabi

21、lity 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.5 Apparatus and materials5.1 Balance of sufficient capacity

22、 to weigh the test specimen required for the airflow instrument used, with an accuracy of 0,2 %.5.2 Airflow instrument, whose principal parts are:5.2.1 Compression cylinder with perforated ends of such dimensions that with the prescribed mass of specimen each cubic centimetre shall contain between 0

23、,16 g and 0,30 g of cotton when compressed.5.2.2 Means for measuring the air permeability of the specimen, comprising, for example: ISO 2014 All rights reserved 1BS ISO 2403:2014ISO 2403:2014(E)a) a suitable air pump;b) one or more valves or other means for controlling the flow of air through, or th

24、e pressure difference across, the specimen in the compression cylinder;c) a manometer for measuring the required air pressure difference across the specimen and a flowmeter for indicating the rate of airflow through it.NOTE Details of certain commercially available instruments which comply with this

25、 specification are given in the Appendices to this International Standard. The method of calibration of airflow instruments is described in Annex A.5.3 International calibration cotton standards (see A.1).6 Atmosphere for conditioning and testing6.1 Condition test samples in the standard atmosphere

26、for 4 h in moving air (or alternatively for 12 h in still air) or for a shorter time if the change in mass in a 2 h period does not exceed 0,25 % before weighing and testing the specimen. Preconditioning is not required.6.2 Weigh and test the specimen in the standard atmosphere for conditioning (see

27、 ISO 139).7 Test Specimen7.1 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 impu

28、rities. 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 adjus

29、tably 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 Procedure8.1 Before each series of measurements, make t

30、he 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 instr

31、ument is correctly adjusted and is giving results on the correct level.8.1.1 Consider the performance of any instrument to be within the requirements of this International Standard if the average results for each such calibration cotton do not differ from its corresponding established values by more

32、 than 0,10 micronaire scale unit.8.1.2 Re-test, by the above procedure, cottons giving differences greater than 0,10 micronaire scale unit between the average of the two tests and the established value. Accept the results if the difference between the two new micronaire values for such a cotton does

33、 not exceed 0,10 micronaire scale unit. If the difference continues to be greater than 0,10 micronaire scale unit, either re-adjust the instrument and repeat the above check procedure or apply, on the basis of the established differences referred to 2 ISO 2014 All rights reservedBS ISO 2403:2014ISO

34、2403:2014(E)above, an appropriate correction or adjustment to test values for subsequent samples submitted for testing.8.2 Pack the test specimen evenly into the compression cylinder, a small portion at a time, fluffing the fibres with the fingers in order to break up any lumps and taking care that

35、all the fibres are inserted in the cylinder. Put the compression plunger in position and lock it.8.3 Cause air to flow through the specimen at the appropriate flow (or pressure) and note the reading on the airflow (or pressure difference) scale of the instrument to an accuracy of about 1 %.8.4 If a

36、second measurement is required for the same specimen, remove the cotton from the instrument, taking care not to lose fibre, and repeat the procedure given in 8.2 and 8.3.9 Calculation and expression of results9.1 For instruments in which the scale is graduated in micronaire values, average the readi

37、ngs for the specimens tested from a sample. If necessary, apply any correction based on 8.1.2 and report the average to the nearest 0.1 micronaire value.9.2 For instruments in which the scale is graduated in units other than micronaire values, convert the direct readings to micronaire values from a

38、previously established conversion curve or statistical relation as described in Annex A. Calculate the converted values as described in 9.1.10 Test reportThe test report shall include the following information:a) reference to this International Standard (i.e. ISO 2403:2014);b) the material source (l

39、int cotton, picker lap, processing waste) and, if possible, type and/or botanical species (desi, Upland, G. barbadense);c) the number of specimens tested, the number of readings per specimen, the number of samples used, and the scheme for drawing them;d) the average values calculated;e) the type, ma

40、ke, and model of instrument used. ISO 2014 All rights reserved 3BS ISO 2403:2014ISO 2403:2014(E)Annex A (informative) Method of calibration of instrumentsA.1 Calibration of airflow instruments is based on samples of a series of International Calibration Cottons which are available from the Standardi

41、zation and Engineering Branch, United States Department of Agriculture, 3275 Appling Road, Memphis, Tennessee, 38133 USA, fax: 011-1-(901) 384-3032, e-mail: cotton.standardsams.usda.gov. These are furnished with micronaire values established by the International Calibration Cotton Standards Committe

42、e.A.2 For calibration purposes use the full range of calibration cottons available. They approximately cover the range of the micronaire values of the worlds commercial cottons.NOTE The routine checking and adjusting of the instrument in relation to a section of the instruments scale is to be distin

43、guished from the more elaborate determination of the locations of numerous points along the full-scale range of the instrument when it is being calibrated. Routine checking for daily use is described in 8.1 to 8.1.2, B.2 and B.3, and in C.3. Calibration of an instrument, such as at the factory or up

44、on receiving it at the laboratory or occasionally under other special circumstances at the laboratory, is described in the following subclauses of this Annex,A.3 For each calibration cotton, make a minimum of two test determinations on each of three test specimens. The difference between the test va

45、lues for the first and second determinations shall not exceed 0,10 unit. If a greater difference is obtained, discard the result and make two determinations on a fresh test specimen. Take the average of the first readings on each of the three test specimens for each calibration cotton.NOTE The scale

46、 from which the readings are noted can already be graduated in micronaire values (as with most commercially available instruments). For a new instrument, it can be a uniformly graduated scale.A.4 For instruments already fitted with a scale graduated in micronaire values, determine the difference bet

47、ween the average scale reading and the corresponding established value for each cotton. If none of these differences exceeds 0,10 unit, regard the previous calibration of the instrument as satisfactory. If greater differences occur, make appropriate instrument checks and adjustments to bring the ins

48、trument performance into compliance with the above requirements. Alternatively, a series of appropriate scale corrections can be calculated.A.5 For instruments fitted with a scale graduated in other than micronaire values, either plot a graph showing the average instrument readings as abscissae and

49、the corresponding established values as ordinates and draw a smooth curve to pass evenly through the points or determine statistically the relation between average instrument readings and corresponding established values in the form of an equation.The deviations between average scale readings and established micronaire value shall not be greater than the equivalent of 0,10 unit, as indicated by the graph or by the statistically established relation, as in A.4.A.6 Use the calibration curve, or the corresponding statistical relation, t