Designation:D1907/D1907M−12(Reapproved2018)StandardTestMethodforLinearDensityofYarn(YarnNumber)bytheSkeinMethod1ThisstandardisissuedunderthefixeddesignationD1907/D1907M;thenumberimmediatelyfollowingthedesignationindicatestheyearoforiginaladoptionor,inthecaseofrevision,theyearoflastrevision.Anumberinparenthesesindicatestheyearoflastreapproval.Asuperscriptepsilon(´)indicatesaneditorialchangesincethelastrevisionorreapproval.ThisstandardhasbeenapprovedforusebyagenciesoftheU.S.DepartmentofDefense.1.Scope1.1Thistestmethodcoversthedeterminationofthelineardensityofalltypesofyarninpackageform,subjecttothelimitationsofsizeandstretchgivenin1.2and1.3.Provisionismadeforexpressingyarnlineardensityinallthetraditionalyarnnumberingsystems.1.2Thistestmethodisapplicabletoyarnsthatstretchlessthan5%whentensionontheyarnisincreasedfrom0.25to0.75cN/tex[0.25to0.75gf/tex].Bymutualagreement,anduseofalowerthanspecifiedreelingtension,thismethodmayalsobeadaptedtomeasurethelineardensityofyarnsthatstretchmorethan5%,undertheaboveforce.1.3Thismethodisapplicabletoyarnsfinerthan2000tex.However,itmaybealsoadaptedtocoarseryarnsbytheuseofskeinsofshorterthanspecifiedlengths,andalternatereelingconditions,agreeabletotheinterestedparties.1.4Dependingontheprocedureusedtocalculatethemoisturecontentoftheyarnbeingtested,anditsactualmoisturecontent,orfinishcontent,orboth,oneormoreofthefollowingoptionsmaybeutilized.1.4.1UnscouredYarn:Option1—Yarnatequilibriumwiththestandardatmospherefortestingtextiles.Option2—Oven-driedyarn.Option3—Oven-driedyarn,pluscommercialmoisturere-gain.1.4.2ScouredYarn:Option4—Scouredyarnatequilibriumwiththestandardatmospherefortestingtextiles.Option5—Oven-dried,scouredyarn.Option6—Oven-dried,scouredyarn,pluscommercialmois-tureregain.Option7—Oven-dried,scouredyarn,pluscommercialal-lowance(commercialmoistureregain,plusanallowanceforfinish).1.5Specimensusedtodetermineyarnlineardensitymayalsobeusedtodeterminetheskeinbreakingstrengthoftheyarn.Hence,thismethodprovidesthesequenceofste...
