Designation:D4031−07(Reapproved2012)StandardTestMethodforBulkPropertiesofTexturedYarns1ThisstandardisissuedunderthefixeddesignationD4031;thenumberimmediatelyfollowingthedesignationindicatestheyearoforiginaladoptionor,inthecaseofrevision,theyearoflastrevision.Anumberinparenthesesindicatestheyearoflastreapproval.Asuperscriptepsilon(´)indicatesaneditorialchangesincethelastrevisionorreapproval.1.Scope1.1Thistestmethodcoversthemeasurementofthechangeinlengthofatensionedskeinoftexturedyarnduetochangeincrimpcharacteristicsbroughtaboutbyexposuretowetordryheat.Thechangeinlength,dependingonprocedure,isameasureofskeinshrinkage,crimpcontraction,bulkshrinkage,orcrimprecovery.1.2Thistestmethodappliestocrimped,continuousmulti-filamentyarnsrangingfrom1.7to88.9tex(15to800denier).1.3Threeconditionsareprovidedforcrimpdevelopmentmediums,andloadingroutinesareprovidedtobeusedontheyarnskeinstoallowdeterminationofyarnbulkbyseveraldifferentprocedures.1.4ThevaluesstatedineitherSIunitsorinch-poundunitsaretoberegardedasstandard.Withinthetext,theinch-poundunitsareshowninparentheses.Thevaluesstatedineachsystemarenotexactequivalent;therefore,eachsystemshallbeusedindependentlyoftheother.Combiningvaluesfromthetwosystemsmayresultinnonconformancewiththespecifi-cation.1.5Thisstandarddoesnotpurporttoaddressallofthesafetyconcerns,ifany,associatedwithitsuse.Itistheresponsibilityoftheuserofthisstandardtoestablishappro-priatesafetyandhealthpracticesanddeterminetheapplica-bilityofregulatorylimitationspriortouse.2.ReferencedDocuments2.1ASTMStandards:2D123TerminologyRelatingtoTextilesD1059TestMethodforYarnNumberBasedonShort-LengthSpecimens(Withdrawn2010)3D1776PracticeforConditioningandTestingTextilesD1907TestMethodforLinearDensityofYarn(YarnNum-ber)bytheSkeinMethodD2258PracticeforSamplingYarnforTestingD4849TerminologyRelatedtoYarnsandFibers3.Terminology3.1ForallterminologyrelatingtoD13.58,YarnsandFibers,refertoTerminologyD4849.3.1.1Thefollowingtermsarerelevanttothisstandard:bulkshrinkage,crimpcontraction,...
