1、Designation:D677402(Reapproved 2010)Standard Test Method forCrimp and Shrinkage Properties for Textured Yarns Using aDynamic Textured Yarn Tester1This standard is issued under the fixed designation D6774;the number immediately following the designation indicates the year oforiginal adoption or,in th
2、e case of revision,the year of last 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 crimpcontraction,residual fiber shrinkage and t
3、heir variability of alltypes of filament yarns(partially oriented yarn(POY),fullyoriented yarn(FOY),flat yarns,textured and bulked continu-ous filament(BCF)carpet yarns)using an automated tester.NOTE1For another method of testing crimp in textured yarns,refer toTest Method D4031.1.1.1 This method ma
4、y also be used for non-textured yarns.1.2 This test method is limited to crimped,multi-filamentyarns ranging from 22.0 to 890 dtex(15 to 800 denier)and forBCF yarns from 890 to 4200 dtex(800 to 3800 denier).1.3 The values stated in either SI or US customary units areto be regarded separately as stan
5、dard.Within the text,the U.S.customary units are in parentheses.The values stated in eachsystem are not exact equivalents;therefore,each system shallbe used independently of the other.Combining values from thetwo systems may result in nonconformance with the method.1.4 This standard does not purport
6、 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 Standards:2D123 Termi
7、nology Relating to TextilesD2258 Practice for Sampling Yarn for TestingD4031 Test Method for Bulk Properties of Textured YarnsD4849 Terminology Related to Yarns and Fibers3.Terminology3.1 For definitions of textile terms in this test method,referto Terminology D4849.For other textile terms used in t
8、his testmethod,refer to Terminology D123.4.Summary of Test Method4.1 The specimen passes through a pretension device toremove crimp.The specimen then passes,at a constant speed,around an input roller,to a calibrated sensor which maintains aspecific tension.4.1.1 Subsequently,the specimen passes thro
9、ugh a heatingelement,at a low tension,where the specimen shrinks andagain is crimped.4.1.2 The crimped specimen then goes to an intermediateroll,at a low tension.4.1.3 The specimen then travels to a second sensor,whichmaintains a tension equal to the pretension applied,to removedeveloped crimp.4.2 R
10、esidual fiber shrinkage,crimp developed,and maxi-mum total contraction are calculated by the computer softwareusing speeds of the input,intermediate and output rolls.5.Significance and Use5.1 Test Method D6774,for determining maximum totalcontraction,crimp,and residual fiber shrinkage in texturedfil
11、ament yarns is suitable for acceptance testing of commercialshipments.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 st
12、atisticalassistance.As a minimum,use the samples for such a com-parative tests that are as homogeneous as possible,drawn fromthe same lot of material as the samples that resulted in disparateresults during initial testing and randomly assigned in equalnumbers to each laboratory.The test results from
13、 the labora-tories involved should be compared using a statistical test forunpaired data,a probability level chosen prior to the testingseries.If a 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.1T
14、his 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 June 1,2010.Published September 2010.Originallyapproved in 2002.Last previous edition approved in 2002 as D6774-02.DOI:10.152
15、0/D6774-02R10.2For 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.Copyright ASTM International,100 Barr Harbor Drive,P
16、O Box C700,West Conshohocken,PA 19428-2959.United States1 5.2 The properties and their variability as measured by thismethod relate to bulk appearance,stretch and recovery offabrics and dyeability of yarns.5.3 For some yarns,elapsed time between processing andtesting has a marked effect on the results,of this test,especiallyduring the first 72 h.The effect is caused by stress decay whichis known to be minimal beyond the seventh day and afterwhich time the yarn remains relatively stable.Therefore