1、Designation:D671707(Reapproved 2012)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 and health practices and determine the applica-bility of regulatory limitations prior to use.2.Referenced Documents2.1 ASTM Standards:2D123 Terminology Relating to TextilesD1776 P
6、ractice 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 D13.58,Yarns andFibers,refer to Term
7、inology 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 formon a reel.The skein is cut,rem
8、oved 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-laboratory precision are acceptabl
9、e 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 bias between them,using competent
10、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 laboratory.The test results from the l
11、aboratoriesinvolved 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 consideration of the known bias.5.2 Linea
12、r 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 does notcover the removal of finish
13、for the determination of lineardensity of“finish-free”elastomeric yarns.6.Apparatus6.1 Reel3,1.125-m(1.230-yd)circumference,with multiplepositions for making several skeins at one time,guides thatapply minimal friction to the running yarn,and with vertical-mount creel,with automatic counter to set a
14、nd count the1This 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 1,2012.Published August 2012.Originallyapproved in 2001.Last previous edition approved in 2007 as D6717 07
15、.DOI:10.1520/D6717-07R12.2For 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 onthe ASTM website.3This test apparatus is commercially avai
16、lable.Copyright ASTM International,100 Barr Harbor Drive,PO Box C700,West Conshohocken,PA 19428-2959.United States1 number of revolutions.The operating speed may be from 25 to40 rpm;however,30 rpm is preferred.6.2 Measuring Tape,6-mm(0.25-in.)wide,steel,accurateto 1 mm(0.05 in.),to verify the reel circumference.6.3 Pads,sheepskin,to prevent yarn from sloughing off thebottom of the package during reeling.6.4 Balance,with an accuracy of 60.1%of the expectedmass of the specimens.Balance pan should
