BS ISO 17202-2002 Textiles - Determination of twist in single spun yarns - Untwist retwist method《纺织品 单丝纱捻度的测定 丝纱松劲和上劲法》.pdf
《BS ISO 17202-2002 Textiles - Determination of twist in single spun yarns - Untwist retwist method《纺织品 单丝纱捻度的测定 丝纱松劲和上劲法》.pdf》由会员分享,可在线阅读,更多相关《BS ISO 17202-2002 Textiles - Determination of twist in single spun yarns - Untwist retwist method《纺织品 单丝纱捻度的测定 丝纱松劲和上劲法》.pdf(20页珍藏版)》请在麦多课文档分享上搜索。
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 the
2、authority of the Standards Policy and S t r a t e g y C o m m i t t e e o n 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 e
3、ntrusted to Technical 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 t
4、his document may 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 c
5、ontract. Users 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 proposal
6、s for change, 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
7、 and a back cover. The BSI copyright date displayed in this document indicates when the document was last issued. Amendments issued since publication Amd. No. Date Comments Reference number ISO 17202:2002(E)INTERNATIONAL STANDARD ISO 17202 First edition 2002-11-01 Textiles Determination of twist in
8、single spun yarns Untwist/retwist method Textiles Dtermination de la torsion des fils de fibres simples Mthode de dtorsion/retorsion BSISO17202:2002IS: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 d
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13、irypthgiso.c h Web ww.wiso.ch Printi denS witlrez dnaii I SO 2002 Allr ithgsr esedevrBSISO17202:2002iiIS:20271 O2002(E) I SO 2002 All irthgs ersedevr iiiContents 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 a
14、tmosphere . 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 BSISO17202:2002iiiIS:20271 O2002(E)
15、vi I SO 2002 All irthgs ersedevrForeword 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 inter
16、ested 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
17、 Commission (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 te
18、chnical 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 pat
19、ent 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. BSISO17202:2002ivIS:20271 O2002(E) I S
20、O 2002 All irthgs ersedevr vIntroduction 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 by
21、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 prese
22、nt method is therefore restricted to ring spun yarns. BSISO17202:2002vINTENRATIONAL TSANDADR IS:20271 O2002(E)I SO 2002 All irthgs ersedevr 1Textiles Determination of twist in single spun yarns Untwist/retwist method 1 Scope This International Standard specifies a method for the determination of the
23、 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 and self tw
24、ist 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 permit their
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