ASTM D2838-2007 塑料薄膜和薄板的收缩张力及定向释放应力的标准试验方法

作者:标准资料网 时间:2024-05-05 20:19:33  浏览:8964   来源:标准资料网

【英文标准名称】:StandardTestMethodforShrinkTensionandOrientationReleaseStressofPlasticFilmandThinSheeting
【原文标准名称】:塑料薄膜和薄板的收缩张力及定向释放应力的标准试验方法
【标准号】:ASTMD2838-2007
【标准状态】:现行
【国别】:
【发布日期】:2007
【实施或试行日期】:
【发布单位】:美国材料与试验协会(ASTM)
【起草单位】:D20.19
【标准类型】:(TestMethod)
【标准水平】:()
【中文主题词】:箔;塑料;铁路;测试
【英文主题词】:film;orientationreleasestress;shrinkforce;shrinktension;thinsheeting;
【摘要】:Asaresultofthemanufacturingprocess,internalstressesarelockedintothefilmandthesecanbereleasedbyheating.Foranygiventypeoffilmorsheeting,thetemperaturesatwhichshrinkagewillbeginarerelatedtoprocessingtechniquesemployedtomanufacturethefilmandalsomayberelatedtoaphasetransitioninthebaseresin.Shrinktensionaffectstheappearanceandperformanceofafilminashrink-packagingapplication.Itmayalsobeusedtodeterminethedegreeanddirectionoforientation.Theorientationexertsagreatinfluenceuponimportantphysicalcharacteristicssuchastensilestrength,stiffness,tearresistance,andimpactstrength.DatafromProcedureAaremostusefulfordeterminingthedegreeanddirectionoforientation,orientationreleasestress,andthemaximumforcethatthefilmcanexertatagiventemperature.Since,inactualapplications,filmisseldom,ifever,totallyrestrained,datafromProcedureBareusefulinestimatingtheforceanitemtobepackagedwillactuallyreceiveandinpredictingtheappearanceofpackageditems.Thecharacterizationofshrinktensionasafunctionoftemperature,andtheresultantdeterminationoforientationreleasestressanditscorrespondingtemperature,isusuallycarriedoutonlyforaparticularmaterialofspecifiedthicknessforadefinedfabricationprocess.Forproductdevelopmentpurposes,qualitycontrolanddeterminationofconformitytospecificationlimits,themeasurementofshrinktensionatonlyoneortwospecifiedtemperaturesisnormallysufficient.Beforeproceedingwiththistestmethod,referenceshallbemadetothespecificationofthematerialbeingtested.Anytestspecimenpreparation,conditioning,dimensions,ortestingparameters,orcombinationthereof,coveredintherelevantASTMmaterialspecificationshalltakeprecedenceoverthosementionedinthistestmethod.IftherearenorelevantASTMmaterialspecifications,thenthedefaultconditionsapply.Table1ofClassificationSystemsD4000liststheASTMmaterialspecificationsthatcurrentlyexist1.1Thistestmethodcoversthedeterminationoftheshrinktensionandrelatedcharacteristics,thatis,shrinkforceandorientationreleasestress,ofheat-shrinkableplasticfilmandsheetingoflessthan1.0mm(0.04in.)thickness.Twoproceduresaredescribedthatpermitthemeasurementofshrinkforcesatpredeterminedtemperatures.Theyareasfollows:1.1.1ProcedureAisdesignedtomeasurethemaximumforceexertedbyaspecimenthatistotallyrestrainedfromshrinkingasitisheatedrapidlytoaspecifictemperature.1.1.2ProcedureBisdesignedtomeasurethemaximumforceexertedbyaspecimenthatispermittedtoshrinkapredeterminedamountpriortorestraintwhilebeingheatedrapidlytoaspecifictemperature.1.2OrientationreleasestresscanbedeterminedfromthedataobtainedusingProcedureA.1.3ThevaluesstatedinSIunitsaretoberegardedasthestandard.Thevaluesinparenthesesareforinformationonly.Note1ThereisnoknownISOequivalenttothistestmethod.Thisstandarddoesnotpurporttoaddressallofthesafetyconcerns,ifany,associatedwithitsuse.Itistheresponsibilityoftheuserofthisstandardtoestablishappropriatesafetyandhealthpracticesanddeterminetheapplicabilityofregulatorylimitationspriortouse.
【中国标准分类号】:G33
【国际标准分类号】:83_140_10
【页数】:5P.;A4
【正文语种】: