1、Designation:D264412Standard 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 in parentheses ind
2、icates 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 any wool present
3、 in the yarn.NOTE1For tolerances for other spun yarns,see Tolerances D2645.2.Referenced Documents2.1 ASTM Standards:2D123 Terminology Relating to TextilesD1422 Test Method for Twist in Single Spun Yarns by theUntwist-Retwist MethodD1423 Test Method for Twist in Yarns by Direct-CountingD1578 Test Met
4、hod for Breaking Strength of Yarn in SkeinFormD1907 Test Method for Linear Density of Yarn(Yarn Num-ber)by the Skein MethodD2256 Test Method for Tensile Properties of Yarns by theSingle-Strand MethodD2257 Test Method for Extractable Matter in TextilesD2258 Practice for Sampling Yarn for TestingD2494
5、 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 related to yarn test methods,refer toTerminology D4849.3.2 For definit
6、ions 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 otheragreement,proceed as directed in Practice D2258.5.Tolerances5.1 Strengt
7、hThe 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,%500 tex or 0.6 woolen run to 165 tex or 1.86 woolen run 7.5Finer than 165 tex
8、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 average twist of the package containing thehighest average twist shall not be hi
9、gher 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,semi-scoured15.0Oil-spun scoured:Blends,50%wool or less4.0All wool or more tha
10、n 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 exceed the commercialmass as determined by the purchaser,by more than 1%.Inbranche
11、s 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 results of an interlabora-tory test described in Section 10 of Test Method D2494.6.Test Methods6.1 StrengthDetermine the breaking force by Test M
12、ethodD1578 or Test Method D2256,as agreed or specified.1These tolerances are under the jurisdiction of ASTM Committee D13 onTextiles and are the direct responsibility of Subcommittee D13.58 Yarns and Fibers.Current edition approved Feb.1,2012.Published March 2012.Originallyapproved in 1967.Last prev
13、ious edition approved in 2007 as D2644 02(2007).DOI:10.1520/D2644-12.2For 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 websi
14、te.Copyright ASTM International,100 Barr Harbor Drive,PO Box C700,West Conshohocken,PA 19428-2959.United States1 6.2 Yarn NumberDetermine the yarn number by TestMethod D1907,using Option 1,3,or 6 as agreed or specified.6.3 TwistDetermine the twist by Test Method D1423,or,by agreement(for single yarn
15、s only),Test Method D1422.6.4 Extractable MatterDetermine the percent of extract-able matter by Test Method D2257 soxhlet extraction.6.5 MassDetermine the net mass and,if required,thecommercial mass of the shipment by Test Method D2494.7.Conformance7.1 The purchaser and the supplier may agree on a p
16、roce-dure to establish conformance,including control charts fur-nished by the supplier,a sequential-sampling plan,or thedouble-sampling plan outlined in 7.2.7.2 In the absence of a control-chart or sequential-samplingplan,proceed as directed in 7.2.1-7.2.3.7.2.1 If the test results for the lot conform to the tolerancesfor all characteristics specified in Section 5,consider the lot avalid delivery.7.2.2 If the test results for one or more characteristics do notconform to the tolerances,take a new
