ASTM D2644-2002(2007) Standard Tolerances for Yarns Spun on the Woolen System《毛织品系统的细纱标准公差》.pdf

1、Designation: D 2644 02 (Reapproved 2007)Standard Tolerances forYarns Spun on the Woolen System1This standard is issued under the fixed designation D 2644; the number immediately following the designation indicates the year oforiginal adoption or, in the case of revision, the year of last revision. A

2、 number in parentheses indicates the year of last reapproval. Asuperscript epsilon (e) 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 ther

3、e might not be any wool present in the yarn.NOTE 1For tolerances for other spun yarns, see Tolerances D 2645 .2. Referenced Documents2.1 ASTM Standards:2D 123 Terminology Relating to TextilesD 1422 Test Method for Twist in Single Spun Yarns by theUntwist-Retwist MethodD 1423 Test Method for Twist in

4、 Yarns by Direct-CountingD 1578 Test Method for Breaking Strength of Yarn in SkeinFormD 1907 Test Method for Linear Density of Yarn (YarnNumber) by the Skein MethodD 2256 Test Method for Tensile Properties of Yarns by theSingle-Strand MethodD 2257 Test Method for Extractable Matter in TextilesD 2258

5、 Practice for Sampling Yarn for TestingD 2494 Test Method for Commercial Mass of a Shipment ofYarn or Manufactured Staple Fiber or TowD 2645 Tolerances for Yarns Spun on the Cotton or WorstedSystemsD 3888 Terminology Relating to Open-End SpinningD 3990 Terminology Relating to Fabric DefectsD 4849 Te

6、rminology Relating to Yarns and Fibers3. Terminology3.1 Definitions:3.1.1 For definitions of textile terms used in these toler-ances: woolen-spun and woolen system, refer to TerminologyD 4849.3.1.2 For definitions of terms used in this standard: toler-ances and wool, refer to Terminology D 123.3.1.3

7、 For other textile terms used in this test method, refer toTerminologies D 123, D 3888, D 3990, and D 4849.4. 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 otheragreem

8、ent, proceed as directed in Practice D 2258.5. 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 fromthe SpecifiedYarn Number, %500 tex o

9、r 0.6 woolen run to 165 tex or 1.86 woolen run 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 ave

10、rage 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 following values:%Dry-spun 2.0Oil-spu

11、n, 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 and asdetermined by the supplier,

12、shall not exceed the commercialmass as determined by the purchaser, by more than 1 %. In1These 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 July 1, 2007. Published July 2007.

13、Originally approvedin 1967. Last previous edition approved in 2002 as D 2644 02.2For 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.1Copyright ASTM International, 100 Barr Harbor Drive, PO Box C700, West Conshohocken, PA 19428-2959, United States.branches 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 re

15、sults of an interlabora-tory test described in Section 10 of Test Method D 2494.6. Test Methods6.1 StrengthDetermine the breaking force by Test MethodD 1578 or Test Method D 2256, as agreed or specified.6.2 Yarn NumberDetermine the yarn number by TestMethod D 1907, using Option 1, 3, or 6 as agreed

16、or specified.6.3 TwistDetermine the twist by Test Method D 1423,or,by agreement (for single yarns only), Test Method D 1422.6.4 Extractable MatterDetermine the percent of extract-able matter by Test Method D 2257 soxhlet extraction.6.5 MassDetermine the net mass and, if required, thecommercial mass

17、of the shipment by Test Method D 2494.7. 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

18、 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, t

19、ake 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 the first and secondsamples as if all results were from one test of double theoriginal numbe

20、r 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 tolerances, consider the lot a nonvaliddelivery.8. Keywords8.1 tolerances; woolen system; yarnASTM In

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24、tandards, 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 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).D 2644 02 (2007)2