1、Designation:D105917Standard Test Method forYarn Number Based on Short-Length Specimens1This standard is issued under the fixed designation D1059;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 pa
2、rentheses indicates the year of last reapproval.Asuperscript epsilon()indicates an editorial change since the last revision or reapproval.1.Scope1.1 This test method covers the determination of the yarnnumber of all types of cotton,woolen,worsted,and man-madefiber yarns taken from packages;or from a
3、ny textile fabrics inwhich the yarns are intact and can be removed in measurablelengths.The test method is not applicable to yarns taken fromnapped or cut pile fabrics.Because this test method is based onshort-length specimens,the results should only be consideredas approximations of yarn number.NOT
4、E1For a more precise procedure for the determination of yarnnumber,refer to Test Method D1907.NOTE2The following additional methods for the determination ofyarn number have been approved for yarns made from specific fibers:Specification D541,D578,and D681.1.2 This test method is applicable to yarns
5、which stretch lessthan 5%when tension on yarn is increased from 0.25 to 0.75cN/tex(0.25 to 0.75 gf/tex).By mutual agreement it may beadapted to yarns which stretch more than 5%by use of tensionlower than that specified in the method for elastomers or use oftension higher than that specified in the m
6、ethod to pull thecrimp out of textured yarns.1.3 The values stated in SI units are to be regarded asstandard;the values in inch-pound units are reported asinformation only.1.4 This standard does not purport to address all of thesafety concerns,if any,associated with its use.It is theresponsibility o
7、f the user of this standard to establish appro-priate safety and health practices and determine the applica-bility of regulatory limitations prior to use.1.5 This international standard was developed in accor-dance with internationally recognized principles on standard-ization established in the Dec
8、ision on Principles for theDevelopment of International Standards,Guides and Recom-mendations issued by the World Trade Organization TechnicalBarriers to Trade(TBT)Committee.2.Referenced Documents2.1 ASTM Standards:D123 Terminology Relating to TextilesD541 Specification for Single Jute Yarn(Withdraw
9、n 1996)2D578 Specification for Glass Fiber StrandsD629 Test Methods for Quantitative Analysis of TextilesD681 Specification for Jute Rove and Plied Yarn for Elec-trical and Packing Purposes(Withdrawn 2000)2D1423 Test Method for Twist in Yarns by Direct-CountingD1776 Practice for Conditioning and Tes
10、ting TextilesD1907 Test Method for Linear Density of Yarn(Yarn Num-ber)by the Skein MethodD2258 Practice for Sampling Yarn for Testing3.Terminology3.1 DefinitionsThe following terms are relevant to thisstandard:cooton count,cut,indirect yarn numbering system,lea,metric count,run,tex,typp,worsted cou
11、nt,yarn number,yarn numbering system.3.2 For definitions of other textile terms used in this testmethod,refer to Terminology D123.4.Summary of Test Method4.1 Specimens of prescribed length,usually 1 m(1.1 yd)orless,are cut from a conditioned sample,which is underprescribed tension,and weighed.The ya
12、rn number is calcu-lated from the mass and the measured length of the yarn.5.Significance and Use5.1 This is a quick method used for the determination of theapproximate yarn number of short-length specimens takenfrom packages or fabrics.5.2 Because any error present in the reported length of thespec
13、imen is multiplied many times when calculating thetheoretical yarn number using Eq 2 or Eq 3,it is extremelyimportant that the length be measured as precisely as practi-cable.5.3 For the analysis of fabrics,this test method is adequatefor estimating the approximate yarn number of the yarn used to1Th
14、ese test methods are under the jurisdiction of ASTM Committee D13 onTextiles and are the direct responsibility of Subcommittee D13.58 on Yarns andFibers.Current edition approved July 15,2017.Published August 2017.Originallyapproved in 1952.Last previous edition approved in 2001 as D1059 01 which was
15、withdrawn July 2010 and reinstated in July 2017.DOI:10.1520/D1071-17.2The last approved version of this historical standard is referenced onwww.astm.org.Copyright ASTM International,100 Barr Harbor Drive,PO Box C700,West Conshohocken,PA 19428-2959.United StatesThis international standard was develop
16、ed in accordance with internationally recognized principles on standardization established in the Decision on Principles for theDevelopment of International Standards,Guides and Recommendations issued by the World Trade Organization Technical Barriers to Trade(TBT)Committee.1 weave or knit the fabric,but the results obtained by this testmethod may not agree with the nominal yarn number of theyarns actually used to make the fabric because of the changesin the yarn number produced by the weaving o
