【英文标准名称】:StandardTestMethodforMeltFlowRatesofThermoplasticsbyExtrusionPlastometer
【原文标准名称】:用挤压式塑性计测定热塑塑料的熔体流动速率的标准试验方法
【标准号】:ASTMD1238-2010
【标准状态】:现行
【国别】:美国
【发布日期】:2010
【实施或试行日期】:
【发布单位】:美国材料与试验协会(US-ASTM)
【起草单位】:D20.30
【标准类型】:(TestMethod)
【标准水平】:()
【中文主题词】:
【英文主题词】:meltflowrate;meltindex;volumeflowrate;Acrylonitrile-butadiene-styrene(ABS);Extrusionplastometer;Flowandflowrate--thermoplastics;Fluoropolymers;Polycarbonate(PC);Polymers;Thermoplastics
【摘要】:Thistestmethodisparticularlyusefulforqualitycontroltestsonthermoplastics.Thedataproducedbythistestmethodservestoindicatetheuniformityoftheflowrateofthepolymerasmadebyanindividualprocess.Itisnottobeusedasanindicationofuniformityofotherpropertieswithoutvalidcorrelationwithdatafromothertests.Theflowrateobtainedwiththeextrusionplastometerisnotafundamentalpolymerproperty.Itisanempiricallydefinedparametercriticallyinfluencedbythephysicalpropertiesandmolecularstructureofthepolymerandtheconditionsofmeasurement.Therheologicalcharacteristicsofpolymermeltsdependonanumberofvariables.Itispossiblethatthevaluesofthesevariablesoccurringinthistestwilldiffersubstantiallyfromthoseinlarge-scaleprocesses,whichwouldresultindatathatdoesnotcorrelatedirectlywithprocessingbehavior.Measuretheflowrateofamaterialusinganyoftheconditionslistedforthematerialin8.2.Formanymaterials,therearespecificationsthatrequiretheuseofthistestmethod,butwithsomeproceduralmodificationsthattakeprecedencewhenadheringtothespecification.Therefore,itisadvisabletorefertothatmaterialspecificationbeforeusingthistestmethod.Table1inClassificationD4000liststheASTMmaterialsstandardsthatcurrentlyexist.Analternativetestmethodforpoly(vinylchloride)(PVC)compoundsisfoundinD3364.Additionalcharacterizationofamaterialcanbeobtainedifmorethanoneconditionisused.Inthecasethattwoormoreconditionsareemployed,aFlowRateRatio(FRR)isobtainedbydividingtheflowrateatoneconditionbytheflowrateatanothercondition.ProcedureDprovidesonemethodtomeasuremorethanoneconditioninasinglecharge.Frequently,variationsintesttechnique,apparatusgeometry,ortestconditions,whichdefyallbutthemostcarefulscrutiny,exist,causingdiscrepanciesinflowratedeterminations.AtroubleshootingguideisfoundinAppendixX2anditisaresourcetobeusedtoidentifysourcesoftesterror.1.1Thistestmethodcoversthedeterminationoftherateofextrusionofmoltenthermoplasticresinsusinganextrusionplastometer.Afteraspecifiedpreheatingtime,resinisextrudedthroughadiewithaspecifiedlengthandorificediameterunderprescribedconditionsoftemperature,load,andpistonpositioninthebarrel.Fourproceduresaredescribed.Comparableresultshavebeenobtainedbytheseproceduresininterlaboratoryround-robinmeasurementsofseveralmaterialsandaredescribedinSection15.1.2ProcedureAisusedtodeterminethemeltflowrate(MFR)ofathermoplasticmaterial.Theunitsofmeasurearegramsofmaterial/10minutes(g/10min).Itisbasedonthemeasurementofthemassofmaterialthatextrudesfromthedieoveragivenperiodoftime.Itisgenerallyusedformaterialshavingmeltflowratesthatfallbetween0.15and50g/10min(seeNote1).1.3ProcedureBisanautomaticallytimedmeasurementusedtodeterminethemeltflowrate(MFR)aswellasthemeltvolumerate(MVR)ofthermoplasticmaterials.MFRmeasurementsmadewithProcedureBarereporteding/10minutes.MVRmeasurementsarereportedincubiccentimetres/tenminutes(cm3/10min).ProcedureBmeasurementsarebasedonthedeterminationofthevolumeofmaterialextrudedfromthedieoveragivenperiodoftime.Thevolumeisconvertedtoamassmeasurementbymultiplyingtheresultbythemeltdensityvalueforthematerial(seeNote2).ProcedureBisgenerallyusedwithmaterialshavingmeltflowratesfrom0.50to1500g/10min.1.4Pr......
【中国标准分类号】:G32
【国际标准分类号】:83_080_20
【页数】:15P.;A4
【正文语种】:英语
基本信息
| 标准名称： | 冲槽机 精度 |
| 中标分类： |
电工 >>
电工生产设备 >>
电机生产设备 |
| 替代情况： | 被JB/T 5349-2011代替 |
| 发布部门： | 中华人民共和国机械电子工业部 |
| 发布日期： | 1991-06-28 |
| 实施日期： | 1992-07-01 |
| 首发日期： | 1900-01-01 |
| 作废日期： | 2012-04-01 |
| 提出单位： | 机械电子工来部沈阳电工专用设备研究所 |
| 归口单位： | 机械电子工来部沈阳电工专用设备研究所 |
| 起草单位： | 芜湖电工机械厂 |
| 起草人： | 戴卫国、戴庆秋 |
| 出版社： | 机械工业出版社 |
| 出版日期： | 1992-06-01 |
| 页数： | 6页 |
| 批文号： | 机电科标[1991]1087号 |
适用范围
本标准规定了冲槽机的精度检验项目和检验方法。本标准适用于各种内定位、外定位冲槽机。
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所属分类： 电工 电工生产设备 电机生产设备