Designation:D3811/D3811M−96(Reapproved2011)StandardTestMethodforUnwindForceofPressure-SensitiveTapes1ThisstandardisissuedunderthefixeddesignationD3811/D3811M;thenumberimmediatelyfollowingthedesignationindicatestheyearoforiginaladoptionor,inthecaseofrevision,theyearoflastrevision.Anumberinparenthesesindicatestheyearoflastreapproval.Asuperscriptepsilon(´)indicatesaneditorialchangesincethelastrevisionorreapproval.ThisstandardhasbeenapprovedforusebyagenciesoftheDepartmentofDefense.1.Scope1.1Thistestmethodcoversoneprocedurefordeterminingtheforcerequiredtounwindarollofpressure-sensitivetape.1.2ThevaluesstatedineitherSIorinch-poundunitsaretoberegardedseparatelyasstandard.Thevaluesstatedineachsystemmaynotbeexactequivalents;therefore,eachsystemmustbeusedindependently,withoutcombiningvaluesinanyway.1.3Thisstandarddoesnotpurporttoaddressallofthesafetyconcerns,ifany,associatedwithitsuse.Itistheresponsibilityoftheuserofthisstandardtoestablishappro-priatesafetyandhealthpracticesanddeterminetheapplica-bilityofregulatorylimitationspriortouse.2.ReferencedDocuments2.1ASTMStandards:2D996TerminologyofPackagingandDistributionEnviron-mentsD3715/D3715MPracticeforQualityAssuranceofPressure-SensitiveTapesD4332PracticeforConditioningContainers,Packages,orPackagingComponentsforTestingE122PracticeforCalculatingSampleSizetoEstimate,WithSpecifiedPrecision,theAverageforaCharacteristicofaLotorProcess3.Terminology3.1Definitions—Generaltermsinthistestmethodarede-finedinTerminologyD996.4.SummaryofTestMethod4.1Thesamplerolloftapeisplacedonafree-turningspindleheldinaCRE(constant-rate-of-extension)tensiontester.Whilethecrossheadismovedataspecifiedrate,themaximumforcemeasuredduringunwindingofapproximately150mm[6in.]oftapeistakenastheunwindforce.5.SignificanceandUse5.1Thisproceduresimulateshandandmachineunwindingoftapeatlowrates.Theforcerequiredforunwindingatlowratesisafunctionofrate.Atsomerate(expectedtobedifferentforeachconstructiontypeandmanufacturer)thereoccursaninversionoftheresponse.Theratefor...
