Designation:D7879−13StandardTestMethodforDeterminingFlaxFiberWidthsUsingImageAnalysis1ThisstandardisissuedunderthefixeddesignationD7879;thenumberimmediatelyfollowingthedesignationindicatestheyearoforiginaladoptionor,inthecaseofrevision,theyearoflastrevision.Anumberinparenthesesindicatestheyearoflastreapproval.Asuperscriptepsilon(´)indicatesaneditorialchangesincethelastrevisionorreapproval.1.Scope1.1Thistestmethodinvolvesthemeasurementandanalysisoftwo-dimensionalprojectionsofflaxfibersusingimageanalysissoftwareinthelongitudinalplanetodeterminetheaverageanddistributionoffiberwidths.1.2ThevaluesstatedinSIunitsaretoberegardedasstandard.Nootherunitsofmeasurementareincludedinthisstandard.1.3Thisstandarddoesnotpurporttoaddressallofthesafetyconcerns,ifany,associatedwithitsuse.Itistheresponsibilityoftheuserofthisstandardtoestablishappro-priatesafetyandhealthpracticesanddeterminetheapplica-bilityofregulatorylimitationspriortouse.2.ReferencedDocuments2.1ASTMStandards:2D123TerminologyRelatingtoTextilesD1776PracticeforConditioningandTestingTextilesD6798TerminologyRelatingtoFlaxandLinen3.Terminology3.1Definitions:3.1.1ForallterminologyrelatedtoFlaxandLinenseeTerminologyD123.3.1.1.1Thefollowingtermsarerelevanttothisstandard:averagefiberwidth(µm).3.1.1.2FordefinitionsofallothertextiletermsseeTermi-nologyD6798.4.SummaryofTestMethod4.1Thistestmethodinvolvesthepreparationofflaxfibersfordigitalcapture,thescanningofthefibersforanalysis,andthecalibrationandstandardizationoftheimageprocessing.Fromtheimageanalysis,thearithmeticmeananditsstandarddeviation,median,andnumericaldistributionofthefiberwidthsarecalculated.5.SignificanceandUse5.1Longitudinalpreparationismuchquickerandlessdamagingthancross-sectionalanalysisandallowsthefiberstobeevaluatedintheirnaturalstate.5.2Thistestmethodprovidesmeasurementofaflaxfiberspecimenthatuseslessspecimenpreparation,producescon-sistentresults,andminimalspecimenmodification.IthasbeenshownthatthemedianvaluesofwidthcorrelateverywellwiththeOpticalFiberDi...
