ASTM_D_6197_-_99_2017.pdf

Designation:D619799(Reapproved 2017)Standard Test Method forClassifying and Counting Faults in Spun Yarns in ElectronicTests1This standard is issued under the fixed designation D6197;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 classifying and counting offaults in spun yarns using capacitance testers.1.1.1 Protruding fibers or yarn hairiness,or both,are notdetermined as part of this method.NOTE1For measuring protruding fibers or hairiness,or both,refer toGuide D5647.1.2 This test method provides for grading yarns by faultlevel and type.1.3 This test method is applicable to all single or plied spunyarns from natural or manufactured fibers or blends of each.1.4 The values stated in SI units are to be regarded asstandard;the values in inch-pound units are provided asinformation only and are not exact equivalents.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 TextilesD2258 Practice for Sampling Yarn for TestingD5647 Guide for Measuring Hairiness of Yarns by thePhoto-Electric ApparatusD4849 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:spunyarn;yarn fault;yarn fault count.3.3 For definitions of other textile terms used in this testmethod refer to Terminology D123.4.Summary of Test Method4.1 A specimen is passed through the sensing device of aclassifying instrument at a constant speed.The electroniccounting instrument records the faults and classifies themaccording to their length and relative diameter.The faults forthe most part are in the form of thick places,thin places andneps in yarns spun on various spinning systems.5.Significance and Use5.1 This test method is considered satisfactory for accep-tance testing of commercial shipments of spun yarns byagreement between purchaser and supplier.5.1.1 In case of a dispute arising from differences inreported test results when using this test method for acceptancetesting of commercial shipments,the purchaser and suppliershould conduct comparative tests to determine if there is astatistical bias between their laboratories.Competent statisticalassistance is recommended for the investigation of bias.As aminimum,the two parties should take a group of test speci-mens that are as homogenous as possible and that are from a lotof material of the type in question.The test specimens shouldthen be randomly assigned in equal numbers to each laboratoryfor testing.The average result from the two laboratories shouldbe compared using statistical analysis and a probability levelchosen by the two parties before the testing is begun.If a biasis found,either its cause must be found and corrected or thepurchaser and the supplier must agree to interpret future testresults with consideration to the known bias.5.2 Yarn faults are a factor in determining yarn and fabricquality.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 1,2017.Published July 2017.Originally approvedin 1999.Last previous edition approved in 2011 as D619799(2011).DOI:10.1520/D6197-99R17.2For 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.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.Apparatus6.1 Electronic Measuring DeviceA capacitance or opticalunit with guide alignment of the yarn in a straight path throughthe measuring zone.6.2 Control UnitA device that supplies the signal tooperate the measuring device and,al