基本信息
标准名称: | 压汽式蒸馏水机 |
中标分类: |
医药、卫生、劳动保护 >>
制药、安全机械与设备 >>
制药加工机械与设备 |
替代情况: | 调整为YY 0230-1995 |
发布日期: | |
实施日期: | 1990-07-01 |
首发日期: | |
作废日期: | |
出版日期: | |
适用范围
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前言
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目录
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引用标准
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所属分类: 医药 卫生 劳动保护 制药 安全机械与设备 制药加工机械与设备
【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】: