ASTM_D_5344_-_99_2017.pdf

Designation:D534499(Reapproved 2017)Standard Test Method forExtension Force of Partially Oriented Yarn1This standard is issued under the fixed designation D5344;the number immediately following the designation indicates the year oforiginal adoption or,in the case of revision,the year of last revision.A number in parentheses indicates the year of last reapproval.Asuperscript epsilon()indicates an editorial change since the last revision or reapproval.1.Scope1.1 This test method covers the measurement of extensionforce developed while drawing a partially oriented filamentyarn between pairs of draw rolls of different surface speeds.1.2 Extension force provides an estimate of the yarn orien-tation.1.3 This test method applies to partially oriented filamentyarns less than 33.3 tex(300 denier),but it can be used forhigher deniers by applying the test conditions as directed inAppendix X1.1.4 The values stated in SI units are to be regarded asstandard.The values given in parentheses are provided forinformation only.1.5 This standard does not purport to address all of thesafety concerns,if any,associated with its use.It is theresponsibility of the user of this standard to establish appro-priate safety and health practices and determine the applica-bility of regulatory limitations prior to use.1.6 This international standard was developed in accor-dance with internationally recognized principles on standard-ization established in the Decision on Principles for theDevelopment of International Standards,Guides and Recom-mendations issued by the World Trade Organization TechnicalBarriers to Trade(TBT)Committee.2.Referenced Documents2.1 ASTM Standards:2D123 Terminology Relating to TextilesD1776 Practice for Conditioning and Testing TextilesD2258 Practice for Sampling Yarn for TestingD2904 Practice for Interlaboratory Testing of a Textile TestMethod that Produces Normally Distributed Data(With-drawn 2008)3D2906 Practice for Statements on Precision and Bias forTextiles(Withdrawn 2008)3D4849 Terminology Related to Yarns and Fibers3.Terminology3.1 For terminology related to yarn test methods refer toTerminology D4849.3.2 The following terms are relevant to this standard:drawing;draw ratio(DR);draw texturing;extension;extensionforce;partially oriented yarn.3.3 For definitions of other textile terms used in this testmethod refer to Terminology D123.4.Summary of Test Method4.1 Partially oriented filament yarn withdrawn from a pack-age is pretensioned,heated,and drawn on an instrument underconditions similar to those used in the draw-texturing process.Atension measuring head senses the force required to draw therunning yarn a specified amount of its original length undergiven conditions.5.Significance and Use5.1 This test method is considered satisfactory for accep-tance testing of commercial shipments because current esti-mates of between-laboratory precision are acceptable and themethod is used extensively in the trade for acceptance testing.5.1.1 If there are differences or practical significance be-tween reported test results for two laboratories(or more),comparative tests should be performed to determine if there isa statistical bias between them,using competent statisticalassistance.As a minimum,the test samples to be used are ashomogeneous as possible,are drawn from the material fromwhich the disparate test results are obtained,and are assignedrandomly in equal numbers to each laboratory for testing.Other materials with established test values may be used forthis purpose.The test results from the two laboratories shouldbe compared using a statistical test for unpaired data,at a1This test method is under the jurisdiction ofASTM Committee D13 on Textilesand is the direct responsibility of Subcommittee D13.58 on Yarns and Fibers.Current edition approved July 1,2017.Published July 2017.Originally approvedin 1993.Last previous edition approved in 2011 as D534499(2011).DOI:10.1520/D5344-99R17.2For referenced ASTM standards,visit the ASTM website,www.astm.org,orcontact ASTM Customer Service at serviceastm.org.For Annual Book of ASTMStandards volume information,refer to the standards Document Summary page onthe ASTM website.3The last approved version of this historical standard is referenced onwww.astm.org.Copyright ASTM International,100 Barr Harbor Drive,PO Box C700,West Conshohocken,PA 19428-2959.United StatesThis international standard was developed in accordance with internationally recognized principles on standardization established in the Decision on Principles for theDevelopment of International Standards,Guides and Recommendations issued by the World Trade Organization Technical Barriers to Trade(TBT)Committee.1 probability level chosen prior to the testing series.If a bias isfound,either its cause must be found and corrected,or futuretest results must be adjusted in consideration of the knownbias.5.2 Elapsed time between spinning and testing has a markedeffect on the results of the draw tension test,especially duringth