BS ISO BRITISHSTANDARD 17202:2002 Textiles Determination of twist in single spun yarns : Untwist/retwist method ICS 59.080.20 BSi NOCOPYINGWITHOUTBSIPERMISSIONEXCEPTASPERMITTEDBYCOPYRIGHTLAW British Standards BSIS017202:2002 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 Technical Committee TCI/24, Physical testing of textiles, which has the responsibility to: aidenquirerstounderstandthetext; present to the responsible international/European committee any UK interests informed; monitor related international and European developments and promulgate them in the UK. 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 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 contract. Users are responsible for its correct application. Compliance with a British Standard does not ofitself confer immunity from legal obligations. This British Standard, having Summary of pages been prepared under the This document comprises a front cover, an inside front cover, the ISO title page, direction of the Materials and pages i to V, a blank page, pages 1 to 10, an inside back cover and a back cover. Chemicals Sector Policy and StrategyCommittee,was The BSI copyright date displayed in this document indicates when the published under the authority of the Standards Policy and document was last issued. Strategy Committee on 25November2002 Amendments issued since publication Amd. No. Date Comments BSI25November2002 ISBN0580408051 BS ISO 17202:2002 INTERNATIONAL ISO STANDARD 17202 First edition 2002-11-01 Textiles Determination of twist in single spun yarns Untwist/retwist method Textiles- Détermination de la torsion des files de fibres simples- Methodededetorsion/retorsion Reference number ISO 17202:2002(E) ISO BS ISO 17202:2002 ii BS ISO 17202:2002 Contents Page Foreword... Introduction 1 Scope 2 Normativereferences 3 Terms and definitions 4 Principle.. 5 Apparatus 6 Standard atmosphere 7 Sampling.. 8 Test Specimens .. 9 Procedure 1 - Determination of direction of twist. 10 Procedure 2 Determination of amount of twist.. 11 Calculations ... 12 Test report Annex A (informative) Suggested procedure for sampling. Bibliography.. ili BS ISO17202:2002 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 interested in a subject for which a technical committee has been established has liaison with isO, also take part in the work. isO collaborates closely with the International Electrotechnical Commission (IEC) on all matters of electrotechnical standardization. International Standards are drafted in accordance with the rules given in the ISO/lEC Directives, Part 3. The main task of technical committees is to prepare International Standards. Draft International Standards adopted by the technical 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 patent 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. iv