1、Designation: D2644 12 (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 n
2、umber 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 thewoolen system and composed of any fiber or mixture of fibers,even though there m
3、ight not be any wool present in the yarn.NOTE 1For 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 Intern
4、ational 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 TextilesD1422/D1422M Test Method for Twist in Single Spun Yarnsby the Untwist-Retwist MethodD1423/D
5、1423M 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 MethodD2256/D2256M Test Method for Tensile Properties of Yarnsby the Single-Strand MethodD2257 Test Method
6、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 TowD2645 Tolerances for Yarns Spun on the Cotton or WorstedSystemsD4849 Terminology Related to Yarns and Fibers3. Terminolog
7、y3.1 For terminology 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 applicab
8、le specification or otheragreement, 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 fro
9、mthe SpecifiedYarn Number, %500 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
10、the specified value.5.3.3 The average 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 foll
11、owing values:%Dry-spun 2.0Oil-spun, semi-scoured 15.0Oil-spun scoured:Blends, 50 % wool or less 4.0All wool or more than 50 % wool 10.05.5 Commercial MassIn the absence of other contractualagreements, the invoice mass, that is the commercial mass asadopted in a specific branch of the textile trade a
12、nd asdetermined by the supplier, shall not exceed 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 196
13、7. Last previous edition approved in 2012 as D2644 12. 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
14、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 theD
15、evelopment of International Standards, Guides and Recommendations issued by the World Trade Organization Technical Barriers to Trade (TBT) Committee.1mass 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 sub
16、ject to the same limitation.NOTE 2Particular 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 MethodD1578 or Test Method D2256/D2256M, as agreed or specified.6.2 Yarn NumberDeter
17、mine 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 matter by Test Method
18、 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 proce-dure to establish conformance, including control charts fur-nished by the supplier, a sequential-sa
19、mpling 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
20、.7.2.2 If the test results for one or more characteristics do notconform to the tolerances, take a new laboratory sample fromeither the original lot sample or a new lot sample. Retest the lotfor the characteristic(s) that did not conform to the tolerancesin the first test, and average the results of
21、 the first and secondsamples as if all results were from one test of double theoriginal number of specimens. If the new average(s) con-form(s) to the specified tolerances, consider the lot a validdelivery.7.2.3 If the test results obtained as directed in 7.2.2 do notconform to the specified toleranc
22、es, consider the lot a nonvaliddelivery.8. Keywords8.1 tolerances; woolen system; yarnASTM International takes no position respecting the validity of any patent rights asserted in connection with any item mentionedin this standard. Users of this standard are expressly advised that determination of t
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25、s have not received a fair hearing you shouldmake your views known to the ASTM Committee on Standards, at the address shown below.This standard is copyrighted by ASTM International, 100 Barr Harbor Drive, PO Box C700, West Conshohocken, PA 19428-2959,United States. Individual reprints (single or mul
26、tiple copies) of this standard may be obtained by contacting ASTM at the aboveaddress or at 610-832-9585 (phone), 610-832-9555 (fax), or serviceastm.org (e-mail); or through the ASTM website(www.astm.org). Permission rights to photocopy the standard may also be secured from the Copyright Clearance Center, 222Rosewood Drive, Danvers, MA 01923, Tel: (978) 646-2600; http:/ 12 (2018)2
