ASTM_D_6587_-_12_2018.pdf

Designation:D658712(Reapproved 2018)Standard Test Method forYarn Number Using Automatic Tester1This standard is issued under the fixed designation D6587;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 yarnnumber of filament and spun yarns using automated testers.Some of the instruments are stand-alone and others are optionalmodules for instruments that perform additional tests.1.1.1 The instruments are capable of measuring yarn num-bers up to 4000 dtex(3600 denier).NOTE1For determination of yarn number by use of reel and balance,refer to Test Method D1907.1.2 The values stated in SI units are to be regarded asstandard.1.3 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,health,and environmental practices and deter-mine the applicability of regulatory limitations prior to use.1.4 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 TextilesD1907 Test Method for Linear Density of Yarn(Yarn Num-ber)by the Skein MethodD2258 Practice for Sampling Yarn for TestingD4849 Terminology Related to Yarns and Fibers3.Terminology3.1 For all terminology relating to D13.58,Yarns andFibers,refer to Terminology D4849.3.1.1 The following terms are relevant to this standard:cotton count,denier,linear density,tex,yarn number,yarnnumbering system.3.2 For all other textile terms used in this test method,seeTerminology D123.4.Summary of Test Method4.1 A specified length of yarn(specimen)is automaticallystripped directly from the package,cut,and weighed.The yarnnumber is calculated by an interfaced computer,displayed on amonitor,and may be printed.The yarn number can be reportedin tex,denier,or cotton count units.5.Significance and Use5.1 This test method for yarn number is satisfactory foracceptance of commercial shipments and is used in the trade.5.1.1 In case of a dispute arising from differences inreported test results when using this Test Method for accep-tance testing of commercial shipments,the purchaser and thesupplier should either use the referee Test Method D1907 foryarn number or conduct comparative tests to determine if thereis a statistical bias between their laboratories.Competentstatistical assistance is recommended for the investigation ofbias.As a minimum,the two parties should take a group of testspecimens that are as homogeneous as possible and that arefrom a lot of material of the type in question.The testspecimens should then be randomly assigned in equal numbersto each laboratory for testing.The average results from the twolaboratories should be compared using appropriate statisticalanalysis and a probability level chosen by the two partiesbefore the testing is begun.If a bias is found,either its causemust be found and corrected or the purchaser and the suppliermust agree to interpret future test results with consideration tothe known bias.5.2 This test method is also used for the quality control forboth filament and spun yarns.6.Apparatus6.1 Automatic Yarn Numbering Instrument,with interfacedcomputer.1This 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 1,2018.Published August 2018.Originallyapproved in 2000.Last previous edition approved in 2012 as D6587121.DOI:10.1520/D6587-12R18.2For 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.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 6.1.1 ACW(Automatic Cut and Weigh)Yarn Tester,3Series Tfor textile yarns,Series BCF for bulked continuous filament(BCF)carpet yarns,and Series I for industrial yarns.See Fig.1.The different series testers have different systems fortensioning yarns and diff