Designation:D3108/D3108M−13StandardTestMethodforCoefficientofFriction,YarntoSolidMaterial1ThisstandardisissuedunderthefixeddesignationD3108/D3108M;thenumberimmediatelyfollowingthedesignationindicatestheyearoforiginaladoptionor,inthecaseofrevision,theyearoflastrevision.Anumberinparenthesesindicatestheyearoflastreapproval.Asuperscriptepsilon(´)indicatesaneditorialchangesincethelastrevisionorreapproval.1.Scope1.1Thistestmethodcoversthemeasurementofthekineticfrictionalpropertiesofamovingyarnincontactwithasolidmaterial.NOTE1—Fordeterminingyarn-to-yarnfriction,refertoTestMethodD3412.1.2Thistestmethodspecifiesarelativespeedof100m/min.Thetestmethodmaybeusedatotherspeeds,althoughwithapossiblechangeinprecisionandcoefficientoffriction.1.3Thistestmethodcoversthemeasurementofthecoeffi-cientofkineticfrictionbetweenyarnandsolidsurfaceorsurfacesofconstantradiusinthecontactarea.Ifayarnofuniformvalueisused,comparisonsoffrictionalpropertiesofdifferentsolidmaterialscanbemadewithrelationtothatyarn.Ifagivensolidmaterialisused,comparisonsoffrictionalpropertiesofdifferentyarns,oryarnswithdifferentfinishes,canbemadewithrelationtothatparticularsolidmaterial.1.4Thistestmethodspecificallyrecommendswrapanglesof1.57,3.14and6.28radian(90,180and360°),butotherwrapanglesmaybeused,againwithapossiblechangeinprecisionandlevel.Theangleofwrapshouldnotbesogreat,especiallyforyarnshavinghighcoefficientsoffriction,thatitcausestheoutputtensiontoexceedtheyieldvaluefortheyarnbeingtested.Also,ineverycasetheangleofwrapshouldnotbelessthan1.57rad(90°).1.5Thistestmethodhasbeenappliedtoyarnshavinglineardensitiesrangingbetween1.5and400tex[14and3600denier]andhavingcoefficientsoffrictionrangingbetween0.1and1.0butmayalsobeusedwithyarnsoutsidetheserangesoflineardensitiesandcoefficientsoffriction.1.6ThevaluesstatedineitherSIunitsorinch-poundunitsaretoberegardedseparatelyasstandard.Thevaluesstatedineachsystemmaynotbeexactequivalents;therefore,eachsystemshallbeusedindependentlyoftheother.Combiningvaluesfromthetwosyst...
