【astm標(biāo)準(zhǔn)】d 4635 - 08a

1、Designation:D4635?08aStardSpecificationfPolyethyleneFilmsMadefromLowDensityPolyethylenefGeneralUsePackagingApplications1ThisstardisissuedunderthefixeddesignationD4635thenumberimmediatelyfollowingthedesignationindicatesth

2、eyearofiginaladoptioninthecaseofrevisiontheyearoflastrevision.Anumberinparenthesesindicatestheyearoflastreapproval.Asuperepsilon()indicatesaneditialchangesincethelastrevisionreapproval.1.Scope1.1Thisspecificationcoversun

3、pigmentedunsupptedlowdensitypolyethylenefilms(hereafterreferredtoasfilmfilms)fromClass1polyethylenesperSpecificationD4976.NOTE1—Thedensityofafilmwillnotnecessarilybeequaltothedensityofamoldedplaquefromthesameresin.NOTE2—

4、Blendsofethylenevinylacetate(EVA)withlowdensitypolyethylenemayhavedensitiesupto0.929gcm3.1.2Thisspecificationisapplicabletohomopolymerpolyethylenebutisnotrestrictedtoit.Itisapplicabletofilmsmadefrompolyethylenecopolymers

5、alsoapplicabletofilmsmadefromblendsofhomopolymerscopolymersincludingethylenevinylacetatecopolymers.1.3Thethicknessofthefilmscoveredbythisspecificationis100mless(0.004in.less)inclusive.Themaximumwidthofthesheetlayflatis3.

6、00m(120in.).1.4Thisspecificationdoesnotcoverientedheatshrinkablefilms.1.5Thisspecificationallowsftheuseofrecycledpolyethylenefilmresinasfeedstockinwholeinpartaslongasalloftherequirementsofthisspecificationaremetaslongasa

7、nyspecificrequirementsasgovernedbytheproducerenduserarealsomet.(SeeNote3.)NOTE3—GuideD7209describesterminologydefinitionsrelatedtorecycledplastics.1.6Thisspecificationdefinesthelevelsofthevariousphysicalpropertiesfromwhi

8、chspecificationsfspecificfilmsmaybedescribed.ThelevelsofphysicalpropertiesrequiredbyafilmfagivenapplicationareedfromSection6.HoweverSections25relatingtotolerancesshallapplywithoutchangetoallfilmfallingwithinthescopeindic

9、atedbythetitle1.11.4.1.7Thisspecificationcoversdimensionaltolerancesclassificationsintrinsicqualityrequirementstestmethods.Thedimensionaltolerancesincludethicknesswidthlengthyield.Classificationdefinestypesclassessurface

10、sfinishes.Theintrinsicqualityrequirementsincludedensitywkmanshiptensilestrengthheatsealabilityodaswellastheclassificationpropertiesfimpactstrengthcoefficientoffrictionopticalpropertiessurfacetreatment.Asamplingmethodisin

11、cluded.1.8ThevaluesstatedinSIunitsaretoberegardedasthestard.Thevaluesgiveninparenthesesarefinfmationonly.1.9ThefollowingprecautionarycaveatpertainsonlytothetestmethodsptionSection10ofthisspecification:Thisstarddoesnotpur

12、pttoaddressallofthesafetyconcernsifanyassociatedwithitsuse.Itistheresponsibilityoftheuserofthisstardtoestablishappropriatesafetyhealthpracticesdeterminetheapplicabilityofregulatylimitationspritouse.NOTE4—Thereisnosimilar

13、equivalentISOspecification.2.ReferencedDocuments2.1ASTMStards:2D618PracticefConditioningPlasticsfTestingD882TestMethodfTensilePropertiesofThinPlasticSheetingD883TerminologyRelatingtoPlasticsD1003TestMethodfHazeLuminousTr

14、ansmittanceofTransparentPlasticsD1505TestMethodfDensityofPlasticsbytheDensityGradientTechniqueD1709TestMethodsfImpactResistanceofPlasticFilmbytheFreeFallingDartMethodD1984SpecificationfTallOilFattyAcids(Withdrawn1999)3D2

15、103SpecificationfPolyethyleneFilmSheetingD2457TestMethodfSpecularGlossofPlasticFilmsSolidPlastics1ThisspecificationisunderthejurisdictionofASTMCommitteeD20onPlasticsisthedirectresponsibilityofSubcommitteeD20.19onFilmShee

16、tingMoldedProducts.CurrenteditionapprovedNov.12008.PublishedNovember2008.iginallyapprovedin1986.Lastpreviouseditionapprovedin2008asD463508.DOI:10.1520D463508A.2FreferencedASTMstardsvisittheASTMwebsitewww.astm.gcontactAST

17、MCustomerServiceat.FAnnualBookofASTMStardsvolumeinfmationrefertothestard’sDocumentSummarypageontheASTMwebsite.3Thelastapprovedversionofthishisticalstardisreferencedonwww.astm.g.ASummaryofChangessectionappearsattheendofth

18、isstardCopyright?ASTMInternational100BarrHarbDrivePOBoxC700WestConshohockenPA194282959.UnitedStates17.5Flatness—Theflatnessofthefilmshallbewithinlimitsasmutuallyagreeduponbetweenthebuyertheseller.7.6Dimensiontolerancesf“

19、JSheeting”lipgussetdepthshallbeestablishedbymutualagreementbetweenthepurchaserthesupplier.8.WkmanshipFinishAppearance8.1Film—Thefilmshallhavewkmanshipqualitiesconfmingtogoodcommercialpractice.Thequalityoffilmwithregardto

20、gelsstreakspinholesparticlesoffeignmatterscratcheswrinkleswindchatterundispersedrawmaterialsholestearsblistersshallbemutuallyestablishedbythepurchaserthesupplier.8.2RollFmation:8.2.1Thediameterofcesuponwhichfilmiswoundsh

21、allbeestablishedbymutualagreementbetweenthepurchaserthesupplier.Cesuponwhichfilmiswoundmustnotberecessedateitheredgeoftherollbutmayextendupto6mm(1?4in.)beyondeitheredgeoftheroll.Rollswithcesthatarecrushedarenotabletobemo

22、untedonthepurchaser’sequipmentaretobeconsideredrejects.8.2.2Ridgessoftspotswhichresultinbagginessloosenessoftheunwoundfilmareunacceptablemayberejectedbythepurchaseronarolltorollbasisiftheconditionscontributetopoperfmance

23、ofthefilminenduseapplication.8.2.3Theedgesoftherollmustbefreeofnickscutsthegeneralconditionofrolledgesmustnotinterferewiththeunwindingoftherolls.8.2.4Thetypenumberofsplicesflaggingsofsplicesbreaks(ifunspliced)inrollsofme

24、thanonepieceshallbeestablishedbymutualagreementbetweenthesupplierthepurchaser.9.Sampling9.1Statisticallybasedsamplingplanswhichareappropriatefeachparticularproductquantitymaybeusedtoobtainsamplesfuseindeterminingcomplian

25、cewiththisspecification.9.2Fthepurposesofdevelopingsupplierpurchaserspecificationsalotsizegenerallyreferstothenumberofrollsinalot.Samplingunitsarethoserollsedbyromnumbersfromthelot.Aunitsampleisthesampleoffilmtakenfromth

26、eroll.Caremustbeexercisedintakingunitsamples.Unwindthendiscardseveralturnsfromtherollthentakemethanenoughsampletorunallspecifiedtests.Keepthesamplefrombecomingsoiled.Ensurethatthesampleisnotfoldedcreasedexcessively.10.Te

27、stMethods10.1Conditioning—Conditionthetestspecimensat2362C(73.463.6F)fnotlessthan40hpritotestinaccdancewithSpecificationD4976asotherwisespecifiedbyagreement.Incasesofdisagreementthetolerancesshallbe61C(61.8F).10.2TestCon

28、ditions—Conductthetestsat2362C(73.463.6F)inaccdancewithSpecificationD4976asotherwisespecifiedbyagreement.Incasesofdisagreementthetolerancesshallbe61C(61.8F).10.3Inadditionffilmscontaininghyhilicfillerscomonomerspigmentso

29、thermodifiersconditioningtestingshallbedoneat50610%relativehuity.Incasesofdisagreementthetoleranceshallbe65%relativehuity.10.4Width—Measurewidthwithametalrulecapableofmeasuringtoanaccuracyof61mm(1?16in.).10.5Thickness—Me

30、asurethicknessinaccdancewiththeGeneralTestMethodssectionofSpecificationD2103withthemodificationthatthespecimenshallbetakenasa50mm(2in.)stripacrossthewebmeasuredatintervalsofnotmethan50mm.10.6Yield—SeeTestMethodD4321.10.7

31、Flatness—Measureflatnessusingamethodmutuallyagreeduponbetweenthepurchaserthesupplier.10.8Density—ThedensityofresinsfromwhichthefilmismadeshallbemeasuredinaccdancewithTestMethodD1505.10.9Coeff?cientofFriction—Thekiiccoeff

32、icientoffrictionshallbemeasuredinaccdancewithTestMethodD1984.Thetestshallbeconductedfilmtofilminboththemachinedirectiontransversedirection.10.10OpticalProperties:10.10.1Clarity—Measureclarityofthefilmbyvisualinstrumented

33、meansasagreeduponbetweenthepurchaserthesupplier.10.10.2Gloss—MeasureglossofthefilminaccdancewithTestMethodD2457usinga45glosshead.10.10.3Haze—MeasurehazeinaccdancewithTestMethodD1003.10.11WettingTension—Measurewettingtens

34、ioninaccdancewithTestMethodD2578.10.12ImpactResistance—MeasureimpactresistanceinaccdancewithTestMethodsD1709exceptthatTestMethodAshallbeusedfallgagesoffilm.TABLE5TensilePropertiesPropertyUnitsMachineDirectionTransverseDi

35、rectionTensileStrengthminMPa(psi)11.7(1700)8.3(1200)TensileElongationmin%225350TABLE6HeatSealabilityAFinishofContactSurfacesBHeatSealabilitymin2to20.601to20.601to10.75AHeatsealabilityistheratioofthetensilestrengthofthehe