~~J~Designation:D781-68(Reapproved1973)TechnicalAssociationofPulpandPaperIndustryStandardMethodT803m-50AMERICANSOCIETYFORTESTINGANDMATERIALS1916RaceSt.,Philadelphia,Pa.19103ReprintedfromtheAnnualBookofASTMStandards,CopyrightASTMIfnotlistedinthecurrentcombinedindex,willappearinthenextedition.StandardTestMethodsforPUNCTUREANDSTIFFNESSOFPAPERBOARD,ANDCORRUGATEDANDSOLIDFIBERBOARD1ThisStandardisissuedunderthefixeddesignationD781;thenumberimmediatelyfollowingthedesignationindicatestheyearoforiginaladoptionor.inthecaseofrevision,theyearoflastrevision.Anumberinparenthesesindicatestheyearoflastreapproval.l.Scope1.1Thesemethodscoverthedeterminationofpunctureandstiffnessofpaperboardandcorrugatedandsolidfiberboard.1.2Themethodsappearinthefollowingorder:PunctureTestStiffnessTestPUNCTURETEST2.SignificanceSections2to78to122.1Thepuncturetest(alsoknownastheBeachorG.E.Puncturetest)measurestheresistanceofboardineithersinglesheets(thatis,components)orincombinedformtopunc-ture.Suchpuncturemayresultfromcontactwithsolidobjectssuchasacornerofabox,orthelike.Theunitmeasuredbytheinstrumentistheenergyrequiredtopuncturethecontain-erboardinthedesignatedmanner(oneunitequals0.265in-lb(0.305cm•kg)).Theseunitsareactuallymadeupofseveralcomponents,theprincipalonesbeingtheenergyrequiredtotearthematerialandtheenergyrequiredtobenditoutofthewayofthepoint.Byconductingbothpunctureandstiffnesstests(seeSection8)onthesamelotofmaterial,therelativecontributionofthetearingandthestiffnessmaybeevaluated.2.2Thetestevaluatesinacompositefash-ionsomefabricationfactorsandmaterialvalues,althoughitisnotpossibletoisolatethetwospecifically,3.Apparatus(Fig.I)3.1Pendulum,incorporatinganarminthe207formofanarcof90deg.3.2PuncturePoint,affixedtotheendofthearmandhavingtheshapeofarightangletriangularpyramidIin.(25mm)inheightwithroundedleadingedgesof0.062±0.002-in.(1.57±0.05-mm)radius.Thepointshallbehonedtoa0.062-in.radiusandbaseedgesleftsharp,3.3PuncturePointCollar,loosefittingaroundthebaseofthepuncturepointtoavoidfrictiontha...
