ASTM_D_6587_-_12e1.pdf

Designation:D6587121Standard 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.1NOTEThe units statement was updated editorially in October 2013.1.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 and health practices and determine the applica-bility of regulatory limitations prior to use.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.6.1.1 ACW(Automatic Cut and Weigh)Yarn Tester,3Series Tfor textile yarns,Series BCF for bulked continuous filament1This 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 1,2012.Published October 2012.Originallyapproved in 2000.Last previous edition approved in 2006 as D658700(2006)1.DOI:10.1520/D6587-12.2For 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.3Available from W.Fritz Mezger,Inc.,155 Hall St.,Spartanburg,SC 29302-1523 and Lenzing Technik GrmbH&Co KG,4860 Lenzing,Austria.Copyright ASTM International,100 Barr Harbor Drive,PO Box C700,West Conshohocken,PA 19428-2959.United States1(BCF)carpet yarns,and Series I for industrial yarns.See Fig.1.The different series testers have different systems fortensioning yarns and different yarn running speeds.6.1.2 Autocount C4See Fig.2.6.1.3 Autocount TTA4See Fig.3.6.1.4 Yarn Count Analyzer(YCA)5See Fig.4.6.2 Calibration WeightsTwo grams and others as neededto cover the dtex(denier)ranges of interest.7.Sampling7.1 Lot SampleAs a lot sample for acceptance testing,takeat random the number of shipping units directed in anapplicable material specification or other agreement betweenthe purchaser and the supplier,such as an agreement to usePractice