BS-ISO-17202-2002.pdf
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1、BRITISH STANDARD BS ISO 17202:2002 Textiles Determination of twist in single spun yarns Untwist/retwist method ICS 59.080.20 ? BS ISO 17202:2002 This British Standard, having been prepared under the direction of the Materials and Chemicals Sector Policy and Strategy Committee, was published under th
2、e authority of the Standards Policy and Strategy Committee on 25 November 2002 BSI 25 November 2002 ISBN 0 580 40805 1 National foreword This British Standard reproduces verbatim ISO 17202:2002 and implements it as the UK national standard. The UK participation in its preparation was entrusted to Te
3、chnical Committee TCI/24, Physical testing of textiles, which has the responsibility to: A list of organizations represented on this committee can be obtained on request to its secretary. Cross-references The British Standards which implement international publications referred to in this document m
4、ay be found in the BSI Catalogue under the section entitled “International Standards Correspondence Index”, or by using the “Search” facility of the BSI Electronic Catalogue or of British Standards Online. This publication does not purport to include all the necessary provisions of a contract. Users
5、 are responsible for its correct application. Compliance with a British Standard does not of itself confer immunity from legal obligations. aid enquirers to understand the text; present to the responsible international/European committee any enquiries on the interpretation, or proposals for change,
6、and keep the UK interests informed; monitor related international and European developments and promulgate them in the UK. Summary of pages This document comprises a front cover, an inside front cover, the ISO title page, pages ii to v, a blank page, pages 1 to 10, an inside back cover and a back co
7、ver. The BSI copyright date displayed in this document indicates when the document was last issued. Amendments issued since publication Amd. No. DateComments Reference number ISO 17202:2002(E) INTERNATIONAL STANDARD ISO 17202 First edition 2002-11-01 Textiles Determination of twist in single spun ya
8、rns Untwist/retwist method Textiles Dtermination de la torsion des fils de fibres simples Mthode de dtorsion/retorsion BS ISO 17202:2002 IS:20271 O2002(E) DPlcsid Fremia ihTs PDF file mac ytnoaie nmt deddebyfepca.se In ccaocnadrw eith Aebods licsneilop gnic,y this file mairp eb yntiv ro deewb detu s
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13、c h Web ww.wiso.ch Printi denS witlrez dna ii I SO 2002 Allr ithgsr esedevr BS ISO 17202:2002 ii IS:20271 O2002(E) I SO 2002 All irthgs ersedevr iii Contents Page Foreword iv Introduction. v 1 Scope 1 2 Normative references 1 3 Terms and definitions. 2 4 Principle . 2 5 Apparatus. 3 6 Standard atmos
14、phere . 3 7 Sampling 4 8 Test Specimens. 4 9 Procedure 1 Determination of direction of twist. 5 10 Procedure 2 Determination of amount of twist . 5 11 Calculations. 7 12 Test report 8 Annex A (informative) Suggested procedure for sampling 9 Bibliography 10 BS ISO 17202:2002 iii IS:20271 O2002(E) vi
15、I SO 2002 All irthgs ersedevr Foreword ISO (the International Organization 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 interes
16、ted in a subject for which a technical committee has been established 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 C
17、ommission (IEC) on all matters of electrotechnical standardization. International Standards are drafted in accordance with the rules given in the ISO/IEC Directives, Part 3. The main task of technical committees is to prepare International Standards. Draft International Standards adopted by the tech
18、nical committees are circulated to the member bodies for voting. Publication as an International Standard requires approval by at least 75 % of the member bodies casting a vote. Attention is drawn to the possibility that some of the elements of this International Standard may be the subject of paten
19、t rights. ISO shall not be held responsible for identifying any or all such patent rights. ISO 17202 was prepared by Technical Committee ISO/TC 38, Textiles, Subcommittee SC 23, Fibres and yarns. Annex A of this International Standard is for information only. BS ISO 17202:2002 iv IS:20271 O2002(E) I
20、 SO 2002 All irthgs ersedevr v Introduction The direct twist method (see 1 and 2) has, for a long time, been recognized as the most accurate method of twist determination but the much faster untwist/retwist method has long been used in industry in many countries. In the 1980s the hope was expressed
21、by some Institutes that the untwist/retwist method would be suitable for the measurement of twist of open-end yarns that cannot be measured by the direct method. First experiments in the 1970s and later in the 1990s showed, however, that the untwist/retwist method is not suitable to OE yarns. The pr
22、esent method is therefore restricted to ring spun yarns. BS ISO 17202:2002 v INTENRATIONAL TSANDADR IS:20271 O2002(E) I SO 2002 All irthgs ersedevr 1 Textiles Determination of twist in single spun yarns Untwist/retwist method 1 Scope This International Standard specifies a method for the determinati
23、on of the direction of twist in single yarns and the amount of twist, in terms of turns per unit length, by the indirect untwist/retwist method. This International Standard is applicable to single spun yarns. This International Standard is not applicable to: a) open-end spun yarns; b) false twist an
24、d self twist yarns; c) air-jet yarns; d) yarns that stretch more than 0,5 % when the tension increases from 0,5 cN/tex to 1,0 cN/tex. NOTE Such yarns may be tested under special conditions of tension which are accepted by all parties interested in the test results. e) yarns that are too large to per
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