ASTM_D_2645_-_07_2018.pdf

Designation:D264507(Reapproved 2018)Standard Tolerances forYarns Spun on the Cotton or Worsted Systems1This standard is issued under the fixed designation D2645;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 These tolerances are applicable to all yarns spun on thecotton or the worsted system,either carded or combed,andcomposed of any fiber or mixture of fibers,except cotton tirecords and novelty or fancy yarns.1.2 These tolerances are applicable only to yarns taken frompackages,and not to yarns taken from greige or processedfabrics.NOTE1For tolerances for other spun yarns,see Tolerances D2644,Methods D179 and D738,and Specifications D541 and D681.1.3 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Terminology Relating to TextilesD179 Methods of Testing Cotton Tire Cords and CordFabrics Made from Cotton(Withdrawn 1974)3D541 Specification for Single Jute Yarn(Withdrawn 1996)3D681 Specification for Jute Rove and Plied Yarn for Elec-trical and Packing Purposes(Withdrawn 2000)3D738 Methods of Testing and Tolerances for Rope Madefrom Bast and Leaf Fibers(Withdrawn 1971)3D1422/D1422M Test Method for Twist in Single SpunYarnsby the Untwist-Retwist MethodD1423/D1423M Test Method for Twist in Yarns by Direct-CountingD1578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 MethodD2255/D2255M Test Method for Grading Spun Yarns forAppearanceD2256/D2256M Test Method for Tensile Properties of Yarnsby the Single-Strand MethodD2257 Test Method for Extractable Matter in TextilesD2258/D2258M Practice for Sampling Yarn for TestingD2494 Test Method for Commercial Mass of a Shipment ofYarn or Manufactured Staple Fiber or TowD2644 Tolerances for Yarns Spun on the Woolen SystemD4849 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 system,tolerances,worsted system.3.2 For all other terminology related to extiles,refer toTerminology D123.4.Sampling4.1 Take samples as directed in the applicable materialspecification,or in the absence of specifications,proceed asdirected in Practice D2258/D2258M.5.Tolerances5.1 StrengthThe average breaking force of each lot shallbe equal to or greater than the specified minimum.5.2 Yarn Number:5.2.1 The average yarn number of yarns spun on cottonsystem or the worsted system shall conform to the limits:specified value 64.0%of the specified value.5.3 Twist:5.3.1 The direction of twist in each package or end shall beS or Z,as specified.1These tolerances are under the jurisdiction of ASTM Committee D13 onTextiles and are the direct responsibility of Subcommittee D13.58 on Yarns andFibers.Current edition approved July 1,2018.Published July 2018.Originally approvedin 1967.Last previous edition approved in 2012 as D2645 07(2012).DOI:10.1520/D2645-07R18.2For 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 5.3.2 In all cotton-system yarns except single yarns made ofcotton,the average twist shall conform to the limits:specifiedvalue 65.0%of the specified value.In single cotton yarns,including the single yarn components of plied cotton yarns,theaverage twist shall conform to the limits:specified value610.0%of the specified value.In yarns spun on the worstedsystem the average twist shall conform to the limits:specifiedvalue 67.5%of the specified value.5.4 Ext