1、Designation: D2644 12Standard 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 parenthes
2、es 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 any wo
3、ol present in the yarn.NOTE 1For 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-Counting
4、D1578 Test Method for Breaking Strength of Yarn in SkeinFormD1907 Test Method for Linear Density of Yarn (YarnNumber) 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 fo
5、r 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 related to yarn test methods, refer toTerminology D4849
6、.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 otheragreement, proceed as directed in Practice D2258.5.
7、 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, %500 tex or 0.6 woolen run to 165 tex or 1.86 woolen run
8、 6 7.5Finer than 165 tex or 1.86 woolen run 6 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 thehighes
9、t 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-spun 2.0Oil-spun, semi-scoured 15.0Oil-spun scoured:Blends, 5
10、0 % 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 and asdetermined by the supplier, shall not exceed the commercialmass as determi
11、ned 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.NOTE 2Particular attention is drawn to the results of an interlabora-tory test described in Section 10 of Test Method D2494.6. Test Metho
12、ds6.1 StrengthDetermine the breaking force by Test MethodD1578 or Test Method D2256, as agreed or specified.6.2 Yarn NumberDetermine the yarn number by TestMethod D1907, using Option 1, 3, or 6 as agreed or specified.1These tolerances are under the jurisdiction of ASTM Committee D13 onTextiles and a
13、re the direct responsibility of Subcommittee D13.58 Yarns and Fibers.Current edition approved Feb. 1, 2012. Published March 2012. Originallyapproved in 1967. Last previous edition approved in 2007 as D2644 02(2007).DOI: 10.1520/D2644-12.2For referenced ASTM standards, visit the ASTM website, www.ast
14、m.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.1Copyright ASTM International, 100 Barr Harbor Drive, PO Box C700, West Conshohocken, PA 19428-2959, United States.6.3 Twist
15、Determine the twist by Test Method D1423,or,by agreement (for single yarns 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 M
16、ethod 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-sampling plan, or thedouble-sampling plan outlined in 7.2.7.2 In the absence of a control-chart or sequential-samplingpla
17、n, 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 laboratory sampl
18、e 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 the first and secondsamples as if all results were from one test of double theoriginal number of specimens. If the new
19、 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 tolerances, consider the lot a nonvaliddelivery.8. Keywords8.1 tolerances; woolen system; yarnASTM International takes no posit
20、ion 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 the validity of any such patent rights, and the riskof infringement of such rights, are entirely their own responsibilit
21、y.This standard is subject to revision at any time by the responsible technical committee and must be reviewed every five years andif not revised, either reapproved or withdrawn. Your comments are invited either for revision of this standard or for additional standardsand should be addressed to ASTM
22、 International Headquarters. Your comments will receive careful consideration at a meeting of theresponsible technical committee, which you may attend. If you feel that your comments have not received a fair hearing you shouldmake your views known to the ASTM Committee on Standards, at the address s
23、hown 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 multiple 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 ASTM website (www.astm.org/COPYRIGHT/).D2644 122
