1、Designation:D671707(Reapproved 2018)Standard Test Method forLinear Density of Elastomeric Yarns(Skein Specimens)1This standard is issued under the fixed designation D6717;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 This test method covers the determination of the lineardensity of“as produced”elastomeric yarns made from rubber,spandex or o
3、ther elastomers using a skein.NOTE1For the determination of linear density of elastomeric yarnsusing short length specimens,refer to Test Method D2591.1.2 The method is not applicable to covered,wrapped,orcore-spun yarns,or yarns spun from elastomeric staple,orelastomeric yarns removed from fabrics.
4、1.3 This test method is applicable to elastomeric yarnshaving a range of 40 to 3200 dtex(36 to 2900 denier).1.4 The values stated in SI units are to be regarded as thestandard.The values given in parentheses are for informationonly.1.5 This standard does not purport to address all of thesafety conce
5、rns,if any,associated with its use.It is theresponsibility of the user of this standard to establish appro-priate safety,health,and environmental practices and deter-mine the applicability of regulatory limitations prior to use.1.6 This international standard was developed in accor-dance with intern
6、ationally recognized principles on standard-ization established in the Decision 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:2D123 Termi
7、nology Relating to TextilesD1776 Practice for Conditioning and Testing TextilesD2258 Practice for Sampling Yarn for TestingD2591 Test Method for Linear Density of Elastomeric Yarns(Short Length Specimens)D4849 Terminology Related to Yarns and Fibers3.Terminology3.1 For all terminology relating to D1
8、3.58,Yarns andFibers,refer to Terminology D4849.3.1.1 The following terms are relevant to this standard:denier,elastomeric yarn,linear density,tex.3.2 For all other terminology related to textiles,refer toTerminology D123.4.Summary of Test Method4.1 Aspecimen of specified length is wound into skein
9、formon a reel.The skein is cut,removed from the reel and weighed.Linear density is calculated using the mass of the skein and thelength of yarn.5.Significance and Use5.1 This test method is considered satisfactory for accep-tance testing of commercial shipments because current esti-mates of between-
10、laboratory precision are acceptable and themethod is used extensively in the trade for acceptance testing.5.1.1 If there are differences of practical significance be-tween reported test results for two laboratories(or more),comparative tests should be performed to determine if there isa statistical
11、bias between them,using competent statisticalassistance.As a minimum,use samples for such comparativetests that are as homogeneous as possible,drawn from the samelot of material as the samples that resulted in disparate resultsduring initial testing,and randomly assigned in equal numbersto each labo
12、ratory.The test results from the laboratoriesinvolved should be compared using a statistical test forunpaired data,at a probability level chosen prior to the testingseries.If bias is found,either its cause must be found andcorrected,or future test results for that material must beadjusted in conside
13、ration of the known bias.5.2 Linear density of elastomeric yarns is used in somecalculations for tensile and elastic properties.5.3 The test method is based on elastomeric yarns in theas-produced condition,but may be used for treated elastomericyarns provided the treatment is specified.The method do
14、es notcover the removal of finish for the determination of lineardensity of“finish-free”elastomeric yarns.1This test method is under the jurisdiction ofASTM Committee D13 on Textilesand is the direct responsibility of Subcommittee D13.58 on Yarns and Fibers.Current edition approved July 1,2018.Publi
15、shed August 2018.Originallyapproved in 2001.Last previous edition approved in 2012 as D6717 07(2012).DOI:10.1520/D6717-07R18.2For 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
16、 to the standards Document Summary page 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 theDevelopment of International Standards,Guides and Recommendations issued by the World Trade Organization Technical Barriers to Trade(TBT)Committee.1 6.Apparatus6.1 Re