Designation:D6101–97AnAmericanNationalStandardStandardTestMethodforEquivalentBlackArea(EBA)ofDirtinPulp,PaperandPaperboardbyImageAnalysis1ThisstandardisissuedunderthefixeddesignationD6101;thenumberimmediatelyfollowingthedesignationindicatestheyearoforiginaladoptionor,inthecaseofrevision,theyearoflastrevision.Anumberinparenthesesindicatestheyearoflastreapproval.Asuperscriptepsilon(e)indicatesaneditorialchangesincethelastrevisionorreapproval.INTRODUCTIONThelevelofvisibledirtpresentinpulp,paperorpaperboardcanimpactitsusefulnessinaspecificenduseapplication.Insuchcases,thepresenceofvisibledirtspecksthatarehighinnumber,easilynoticedinvisualexamination,orboth,maydetractmorefromtheapparentusefulnessofthepapermaterialthandoesalowernumberofspecks,orspecksthatarelesseasilynoticedbytheeye.Boththenumberofdirtspecksandtheirvisualimpactmaybeimportant.Forsomeonecontrollingormonitoringthepapermakingprocess,theabsolutephysicalareaofdirt,orthenumberofdirtspeckspresentinaninspectionareamaybeofgreatestimportance.Fortheenduserofthepapermaterial,theoverallvisualimpressionmaybethecriticalparameter.1.Scope1.1Thistestmethodcoverstheuseofimageanalysistodeterminethelevelofdirtinpulp,paper,andpaperboardintermsofEquivalentBlackArea(EBA)ofdirtspeckswithinthephysicalarearangeof0.02to3.0mm2reportedinpartspermillionaswellasthenumberofdirtspeckspersquaremeterofsample.Usingthealgorithmprescribedinthistestmethod,themaximumdirtsizeislimitedto3.0mm2.Extentiontootherspecksizes(forexamplethosegreaterthan3.0mm2inphysicalarea),mayrequirechangesinequipment,calculationproce-dures,orboth,andisnotcoveredinthistestmethod.Thistestmethodcannotbeusedforphysicalareameasurementssinceitdoesnotcorrectlymeasurethedirtspecksforthatmodeofmeasurement.1.2Thespecimentobeevaluatedmusthaveabrightness,asdeterminedbyTestMethodD985,of30%orgreater.Itmaybenecessarytoreformsomepulpsheetsintohandsheetsifthesurfaceistooroughortextured.1.3ThistestmethodisaninstrumentalequivalentofTestMethodD2019,TAPPIT437,andTAPPIT213,allthreeofwhic...
