1、Designation:D264412(Reapproved 2018)Standard Tolerances forYarns Spun on the Woolen System1This standard is issued under the fixed designation D2644;the number immediately following the designation indicates the year oforiginal adoption or,in the case of revision,the year of last revision.A number i
2、n parentheses indicates the year of last reapproval.Asuperscript epsilon()indicates an editorial change since the last revision or reapproval.1.Scope1.1 These tolerances are applicable to all yarns spun on thewoolen system and composed of any fiber or mixture of fibers,even though there might not be
3、 any wool present in the yarn.NOTE1For tolerances for other spun yarns,see Tolerances D2645.1.2 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 Standa
4、rds,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 TextilesD1422/D1422M Test Method for Twist in Single SpunYarnsby the Untwist-Retwist MethodD1423/D1423M Test Method f
5、or Twist in Yarns by Direct-CountingD1578 Test Method for Breaking Strength of Yarn in SkeinFormD1907/D1907M Test Method for Linear Density of Yarn(Yarn Number)by the Skein MethodD2256/D2256M Test Method for Tensile Properties of Yarnsby the Single-Strand MethodD2257 Test Method for Extractable Matt
6、er in TextilesD2258/D2258M Practice for Sampling Yarn for TestingD2494 Test Method for Commercial Mass of a Shipment ofYarn or Manufactured Staple Fiber or TowD2645 Tolerances for Yarns Spun on the Cotton or WorstedSystemsD4849 Terminology Related to Yarns and Fibers3.Terminology3.1 For terminology
7、related to yarn test methods,refer toTerminology D4849.3.2 For definitions of other terms,refer to TerminologyD123.4.Sampling4.1 Take samples as directed in the applicable materialspecification,or as agreed upon by the purchaser and thesupplier.In the absence of an applicable specification or othera
8、greement,proceed as directed in Practice D2258/D2258M.5.Tolerances5.1 StrengthThe average breaking force of each lot shallbe equal to or greater than the specified minimum average.5.2 Yarn NumberThe average yarn number shall be withinthe following tolerances:Deviation fromthe SpecifiedYarn Number,%5
9、00 tex or 0.6 woolen run to 165 tex or 1.86 woolen run 7.5Finer than 165 tex or 1.86 woolen run 5.05.3 Twist:5.3.1 The direction of twist in each package or end shall beS or Z,as specified.5.3.2 The average twist shall conform to the limits:speci-fied value 6 7.5%of the specified value.5.3.3 The ave
10、rage twist of the package containing thehighest average twist shall not be higher than that of thepackage containing the lowest average twist by more than15.0%of the lower average.5.4 Extractable MatterThe average percent extractablematter shall not exceed the following values:%Dry-spun2.0Oil-spun,s
11、emi-scoured15.0Oil-spun scoured:Blends,50%wool or less4.0All wool or more than 50%wool10.05.5 Commercial MassIn the absence of other contractualagreements,the invoice mass,that is the commercial mass asadopted in a specific branch of the textile trade and asdetermined by the supplier,shall not excee
12、d the commercial1These tolerances are under the jurisdiction of ASTM Committee D13 onTextiles and are the direct responsibility of Subcommittee D13.58Yarns and Fibers.Current edition approved July 1,2018.Published July 2018.Originally approvedin 1967.Last previous edition approved in 2012 as D2644 1
13、2.DOI:10.1520/D2644-12R18.2For 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 Ha
14、rbor 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
15、 issued by the World Trade Organization Technical Barriers to Trade(TBT)Committee.1 mass as determined by the purchaser,by more than 1%.Inbranches of the textile trade which use the net mass as thecommercial mass,the latter is subject to the same limitation.NOTE2Particular attention is drawn to the
16、results of an interlabora-tory test described in Section 10 of Test Method D2494.6.Test Methods6.1 StrengthDetermine the breaking force by Test MethodD1578 or Test Method D2256/D2256M,as agreed or specified.6.2 Yarn NumberDetermine the yarn number by TestMethod D1907/D1907M,using Option 1,3,or 6 as agreed orspecified.6.3 TwistDetermine the twist by Test Method D1423/D1423M,or,by agreement(for single yarns only),TestMethod D1422/D1422M.6.4 Extractable MatterDetermine the percent of extract-able m