塑膠射出成形-流變介紹

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1、塑膠射出成形-流變介紹國立高雄應用科技大學機械系王珉玟•流變學為力學的一種,探討物質對於變形所產生的回應性質•高分子加工大都是經由變形來加工成為所要的特殊製品•了解流變特性有助於(UnderstandRheologywillhelp:)模具設計(moldordiedesign…)生產設備設計(射出或押出等)Processingmachinerydesign製程掌控(成形參數)Controltheprocessingparameters高分子的特異功能(Rodclimbing,tubelesssyphon…)1PDFcreatedwithpdf

2、Factorytrialversionwww.pdffactory.com解決一個塑膠加工製程問題(押出或射出)方法:•改良塑膠材料特性或成形參數(流變學探討的範圍)•改良塑膠材料特性(加工學探討的範圍)製程問題流變加工改良塑膠材料特性改良塑膠材料特性改良製程較佳產品MeltFlowRateLoad(Wt+Piston=±0.5%)PistonThermometer(D=9.4742mm)orPRT(±0.1oC)Barrel(D=9.5504mm)TemperatureControl(±0.2oC)Capillary(D=2.0955mm,

3、L=8.000mm)ØStandardizedtest(ASTM,ISO).ØMass/timemeasured.(g/10min.)ØConstantloadtest.ØMFRa1/Viscosity(Ratevarieswithviscosity.)ØMayberelatedto,butnotaØFixeddiediameter.strictfunctionof,MW.ØFixeddieL/Dratio.2PDFcreatedwithpdfFactorytrialversionwww.pdffactory.comSUGGESTEDTEMP

4、ERATURES(°C)ANDLOADS(Kg)FORMFRTESTS.MaterialTemperature(°C)Load(Kg)Acetal(POM-H&POM-CO)1902.16or1.05.Acrylic(PMMA)2301.2or3.8.(a)ABS2005.0.(b)(ABS)2303.8.(a)Celluloseesters1900.325or2.16or21.6.(b)Celulosicesters(CA,CABCP)2102.16.Nylon66(PA66)2750.325.Nylon6(PA6)2351.0or2.16

5、or5.0.Polychlorotrifluorethylene(PCTFE)26512.5.(a)Polyethylene(PE)1250.325or2.16.(b)Polyethylene1900.325or2.16or10or21.6.®Polyethylene31012.5.Polycarbonate(PC)3001.2.Polypropylene(PP)2302.16.(a)Polystyrene(PSorHIPS)1905.0.(b)Polystyrene2005.0.®Polystyrene2301.2or3.8.(a)Poly

6、terephthalate2102.16(b)Polyterephthalate2502.16®Polyterephthalate2852.16.Polyphenylenesulfide(PPS)3155.0.UnplasticizedPVC(UPVC)17521.6.MeltFlowRatevsViscosityWeightMeltFlowRate(MFI)andMeltIndex(MI)aresamePistonMFI=DropWeightper10minutes(gm/10min)IfMFI(orMI)islow,Viscosityis

7、highBarrelIfMFI(orMI)ishigh,ViscosityislowViscosityT=200OrificeT=220T=240MeltMeasurementforMeltFlowRateTestMethod:ASTM1263ShearRateMFImeasuringregionProcessingregion3PDFcreatedwithpdfFactorytrialversionwww.pdffactory.com熔液流動指數(MFI)w•MI為塑膠流變特性中,被使用最多的•美國量測學會MI測試標準ASTMD1238Ex

8、A125/0.325(125度C活塞0.325Kg~44.8Kpa)PP常用L230/2.16來測試•量測10分鐘下押出熔膠克數如25g/min及代表MI=25•M