1、Designation: D2497 07 (Reapproved 2012)Standard Tolerances forManufactured Organic-Base Filament Single Yarns1This standard is issued under the fixed designation D2497; the number immediately following the designation indicates the year oforiginal adoption or, in the case of revision, the year of la
2、st 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 cover first-quality, manufactured,organic-base filament single yarns (namely, bright, semi-dull,dull, s
3、olution-dyed, bleached, unbleached, etc.) regardless ofthe package type. These tolerances cover permissible varia-tions in linear density, tenacity, elongation, twist, and commer-cial weight.1.1.1 These tolerances do not apply to rubber yarns, span-dex yarns, metal-covered yarns, nor to bulk yarns s
4、ince testmethods for these types of yarn are not available. Thesetolerances do not apply to industrial filament yarns.NOTE 1Tolerances for inorganic glass yarns are given in Specifica-tions and Methods D578.1.2 This standard covers only tolerances. It does not coverspecifications or quality levels,
5、for yarns to be used for anypurpose. Specifications for specific properties are subject toagreement by the purchaser and the supplier.NOTE 2While the tolerances specified may be applied to yarn takenfrom fabric, the properties of such yarns will likely differ from the originallevel.1.3 This standard
6、 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
7、Standards:2D123 Terminology Relating to TextilesD578 Specification for Glass Fiber StrandsD1423 Test Method for Twist in Yarns by Direct-CountingD1907 Test Method for Linear Density of Yarn (YarnNumber) by the Skein MethodD2256 Test Method for Tensile Properties of Yarns by theSingle-Strand MethodD2
8、258 Practice for Sampling Yarn for TestingD2494 Test Method for Commercial Mass of a Shipment ofYarn or Manufactured Staple Fiber or TowD4849 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 followi
9、ng terms are relevant to this standard:tolerances.3.2 For all other terminology relating to textiles, refer toTerminology D123.4. Significance and Use4.1 These tolerances may be used as a guide in purchaser/supplier disputes, or to assist in assigning nominal values forlinear density and twist. The
10、tolerances listed for each propertyrepresent the maximum variations deemed acceptable in thetrade.5. Test Methods5.1 Take a sample of yarn as directed in Practice D2258.Make the indicated tests as directed in Test Method D1907 forYarn Number, Test Method D1423 for Direct Twist, TestMethod D2256 for
11、Single Strand Breaking Strength, and TestMethod D2494 for Commercial Mass.6. Tolerances6.1 Linear DensityThe average linear density shall con-form to the average linear density agreed upon between thepurchaser and the supplier with the tolerances specified inTable 1.6.2 StrengthThe average breaking
12、force of the yarn de-termined in single strand tests or the average force at a specificlevel of elongation, in each packing case of ten or more yarnpackages or on a beam, shall be equal to or exceed thepreviously agreed upon level.6.3 ElongationThe average elongation of the yarn at thebreaking force
13、 or at a specified force, in each packing case often or more yarn packages or on a beam, shall conform to thelimits: specified elongation 6 20 % of the specified averageelongation.1These tolerances are under jurisdiction of ASTM Committee D13 on Textilesand are the direct responsibility of Subcommit
14、tee D13.58 on Yarns and Fibers.Current edition approved July 1, 2012. Published August 2012. Originallyapproved in 1963 replacing D1235, D1236, and D1237. Last previous editionapproved in 2007 as D2497 07. DOI: 10.1520/D2497-07R12.2For referenced ASTM standards, visit the ASTM website, www.astm.org,
15、 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.6.4 Twist:6.4.1
16、 DirectionThe direction of twist shall be S or Z asspecified.6.4.2 Number of TurnsThe average number of turns perunit length of yarn, in each packing case of ten or more yarnpackages or on a beam, shall conform to the tolerancesspecified in Table 2.6.5 Commercial MassCommercial mass shall conform to
17、the limits: invoice mass 6 1.0 % of the invoiced mass.NOTE 3Particular attention is drawn to the results of an interlabora-tory test described in Section 10 of Method D2494.7. Conformance7.1 The purchaser and the supplier may agree on a proce-dure to establish conformance, including control charts f
18、ur-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 S
19、ection 6, 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 sample fromeither the original lot sample or a new lot sample. Retest the lotfor the characteristic(s) that did not conform to the tolerancesin
20、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 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
21、.2 do notconform to the specified tolerances, consider the lot a nonvaliddelivery.8. Keywords8.1 breaking strength; cellulose-base man-made fibers;commercial mass; elongation strand; man-made-fibers; organicbase; strand; synthetic base; tolerances; twist; yarn; yarnnumberASTM International takes no
22、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 the validity of any such patent rights, and the riskof infringement of such rights, are entirely their own responsi
23、bility.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
24、 ASTM 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 addr
25、ess 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),
26、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/).TABLE 1 Average Linear Density TolerancesTolerance ofAverageLinearDensity,%Each Individual Yarn
27、Package, Except Beams:All yarns with linear density of 4.4 tex and above or 40 denierand above6 4.0All yarns with linear density below 4.4 tex or 40 denier 6 6.0Each Beam, or Each Case Comprising 10 or More Packages:All yarns 6 3.0TABLE 2 Twist TolerancesTolerancesTurns per Metre:From zero to 40, incl 6 10 turns per metreOver 40 and up to and including 400 6 20 turns per metreOver 400 6 5.0 % of the specifiedaverage twistTurns per Inch:From zero to 1, incl 6 0.25 turn per inchOver 1 and up to and including 10 6 0.5 turn per inchOver 10 6 5.0 % of the specifiedaverage twistD2497 07 (2012)2
