ASTM_D_2645_-_07_2012.pdf

Designation:D264507(Reapproved 2012)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 and health practices and determine the applica-bility of regulatory limitations prior to use.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Terminology Relating to TextilesD179 Methods of Testing Cotton Tire Cords and CordFabrics Made from Cotton(Withdrawn 1974)3D541 Specification for Single Jute Yarn(Withdrawn 1996)3D681 Specification for Jute Rove and Plied Yarn for Elec-trical and Packing Purposes(Withdrawn 2000)3D738 Methods of Testing and Tolerances for Rope Madefrom Bast and Leaf Fibers(Withdrawn 1971)3D1422 Test Method for Twist in Single Spun Yarns by theUntwist-Retwist MethodD1423 Test Method for Twist in Yarns by Direct-CountingD1578 Test Method for Breaking Strength of Yarn in SkeinFormD1907 Test Method for Linear Density of Yarn(Yarn Num-ber)by the Skein MethodD2255 Test Method for Grading Spun Yarns for AppearanceD2256 Test Method for Tensile Properties of Yarns by theSingle-Strand MethodD2257 Test Method for Extractable Matter in TextilesD2258 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 D2258.5.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 value6 4.0%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.5.3.2 In all cotton-system yarns except single yarns made ofcotton,the average twist shall conform to the limits:specifiedvalue 6 5.0%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 value 610.0%of the specified value.In yarns spun on the worstedsystem the average twist shall conform to the limits:specifiedvalue 6 7.5%of the specified value.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 1,2012.Published August 2012.Originallyapproved in 1967.Last previous edition approved in 2007 as D2645 07.DOI:10.1520/D2645-07R12.2For 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 States1 5.4 Extractable MatterThe average percent extractablematter in yarns spun on the worsted system shall not exceed thefollowing values:%Oil-spun yarns4.0Dry-spun yarns1.755.5 AppearanceAt least 80%of the specimens examinedshall be equal in appearance to the standard for the specifiedgrade.The remaining 20%shall not fall below the next lowergrade.5.6 Uniformity:5.6.1 Yarns Spun on the Cotton SystemThe coefficients ofvariation of individual observations shall not exceed the limitsin Table 1.5.6.2 Yarns Spun on the Worsted SystemThe average twistof the package containing the highest average twist shall not behigher than that of the package containing the lowest averagetwist by more than 15.0%of the