Designation:D5725–99(Reapproved2003)AnAmericanNationalStandardStandardTestMethodforSurfaceWettabilityandAbsorbencyofSheetedMaterialsUsinganAutomatedContactAngleTester1ThisstandardisissuedunderthefixeddesignationD5725;thenumberimmediatelyfollowingthedesignationindicatestheyearoforiginaladoptionor,inthecaseofrevision,theyearoflastrevision.Anumberinparenthesesindicatestheyearoflastreapproval.Asuperscriptepsilon(e)indicatesaneditorialchangesincethelastrevisionorreapproval.INTRODUCTIONThepropertyofaliquidtoadhereto,or“wet”,asheetedsurface,ortobeabsorbedbythatsurface,orboth,isimportantinmanyaspectsofpapermanufacturingandconverting,aswellasintheend-useapplicationsofmanyconvertedpaperproducts.Examplesinclude,butarenotlimitedto,theabsorptionofwaterorotherliquidbyanabsorbentstructure(suchasanabsorbenttissueorwipe);theadhesionofaninktoapolymerfilmoracoatedoruncoatedpaper(suchasapackagingorwrappingmaterial);theadherenceofapolymerfilmorsizingmaterialtoapapersubstrateinalaminateorcoatedstructure;theadhesionofapressuresensitivetapetoareleasepaper;theadhesionofafilmtoapapersubstrateinacompositestructure(suchasadiaperorothercompositestructure);andthenon-wettingornon-absorbency,orboth,ofabarrierpaper.Thewettingorsorptivebehaviorbetweenaliquidandaparticularsheetedsubstrateisdependent,atleastinpart,upontherelationshipofthesurfaceenergy(tension)oftheliquidandthesurfaceenergyofthesubstrate.Thetheoreticalrelationshipoftheseenergiesiscomplex,andthedifferentmathematicalmodelswhichhavebeenproposedforadhesion,wettability,andsorptionarebeyondthescopeofthistestmethod,butmaybefoundinstandardtextsintheseareas.Inmanycases,however,thecontactangleofthefluidwhichwillbeincontactwiththesubstrate,orthecontactangleofaliquidofknownsurfacetension,whenplacedincontactwithasubstrateofinterest,isusedtounderstandorpredictin-processorend-useresultsofaparticularprinting,adhesion,orsorptiveapplication.ContactanglemeasurementsasdescribedinTestMethodD724orCanadianPulpandPaperAssociationCPPAF.3Hhavebeenusedtost...
