科学化射出成型课件

SymbolTechnologiesScientificInjectionMolding科学化射出成型

(ProcessOptimization)(过程最优化)JohnnySinghSymbolTechnologiesScientific2CONTENTS内容

Introduction简介

PlasticFlowRate塑料的流动率

PlasticPressurel

塑料的压力CoolingRateandTime冷却的速率和时间

PlasticTemperature塑料的温度

CharacteristicstoMonitor塑料特性之监控

MoldingWindowoptimizationl

成型窗口最优化Appendix附注2CONTENTS内容Introduction简介31.IntroductionScientificInjectionMoldingEnsuresthatidenticalpartsareproducedconsistentlyindependentofthenormalmachinetomachine,daytodayandlottolotvariations保证相同部件生产的一致性,不受一般的不同机器,生产批号,日期之变异所影响Scientificapproachtoestablishallmoldingvariables以科学的方法来建立所有成型的变异数Providesabilitytodetectanddocumentproblemsbasedondata-notpersonalopinions能够用数据化的方式来侦测和纪录问题点,而不是靠个人观点Canincreaseprofitmarginby20to50%能够提高利润20%到50%31.IntroductionScientificInj41.IntroductionProfitpercentage(利潤百分比)41.IntroductionProfitpercent5EffectofCycleTimeonProfit(成型周期对利润的影响)PartWeight(gm)(部件重量)Material(材料)ApproxCostperlb(1b的大约成本)MaterialCost–Cents(物料成本—分)CycleTime(周期)MachineRate$/hr(机械速率)CycleTimeCost–Cents(周期成本—分)ActualPlasticCost(实际塑料成本)OverheadsandLabor(管销和人力)Profitat5%-Cents(利润5%)分PercentofQuotedPriceProfit(报价利润率)50PC/ABS

$3.0033.320.0

$30.0016.750.060.55.5210050PC/ABS

$3.0033.322.5

$30.0018.852.163.03.4462.350PC/ABS

$3.0033.325.0

$30.0020.854.265.51.3624.61.Introduction5EffectofCycleTimeonProfi61.IntroductionFourCriticalcomponentstomakeagoodpart做出好成品的四大重要成分PartDesign(成品设计)Materialselectionandhandling(材料选择和处理方式)Tooldesignandconstruction(模具设计和结构)Processing(加工制程)InProcessing,thefourmainplasticvariables(加工中的四大塑料变异因素)PlasticFlowRate(塑料流动率)PlasticPressure塑料压力CoolingRate&Time冷却速率和时间PlasticTemperature塑料温度61.IntroductionFourCritical72.PlasticFlowRateFundamentals基本性Itsflowpatternislikefountainflow塑料流动模式类似于喷泉流动模式Chainendssticks&freezetowall,thusformingfrozenlayers.流体末端会附着、凝固在侧壁,形成凝固层Directlyproportionaltoshearrate;highertheshear,fastertheflow与剪切率比例成正比:剪切率越高,流动率越快Inverselyproportionaltoviscosity;lowertheviscosity,fastertheflow与黏度比例成反比:黏度越低,流动率越快BigmisunderstandingaboutMFR,itdoesNOTcorrelatetoprocessability

对MFR的误解,它与加工能力无关Whatdoesitaffect?它的影响72.PlasticFlowRateFundament82.PlasticFlowRateTypicalPlasticFlow典型的塑膠流動率StiffEasySlowFast82.PlasticFlowRateTypicalP92.PlasticFlowRateTypicalPlasticFlow典型的塑膠流動StiffEasySlowFastNonNewtonianMixedNewtonian92.PlasticFlowRateTypicalP102.PlasticFlowRateNewtonianfluidscanbedefinedasthoseforwhichviscosityisaconstantregardlessofshearstressorrateofshear.牛顿流体可被定义为黏度是一个常数,不随着剪切应力或剪切率变化的流体。Non-Newtonianfluidsarethoseforwhichviscosityisnotaconstant,butvariesbasedupontherateofshearortheshearstress.非牛顿流体是那些黏度不是一个常数,而是随着剪切应力或剪切率变化的流体102.PlasticFlowRate112.PlasticFlowRateMomentumEffect慣性作用StiffEasySlowFastElectric電力Hydraulic水力112.PlasticFlowRateMomentum122.PlasticFlowRateMFREffectMFR效應StiffEasySlowFast11.5MFR6MFRMFR10gm/10minutes.ShearRate1/10/60=.007Machineflowrate30gmin.5sec=3/.05=60122.PlasticFlowRateMFREffe132.PlasticFlowRateMeltTempEffect融熔溫度效應StiffEasySlowFast525degF425degF132.PlasticFlowRateMeltTem142.PlasticFlowRatePlasticViscosityVaries塑料黏度的变化与以下有关Withinjectionspeed与射出速度Lotchanges,temperature生产批号变化,温度%regrind,colorants再生料%,抽料制程Screwrotatetime螺杆旋转速度-Butthesecanbeminimizedbyvelocitycontrol但这些可经速度控制减到最小Whatelsechangestheviscosity?其他改变黏度的因素:Inordertohavecruisecontrolonvelocity,weneedtohaveconstantfilltime(samefilltimeonanypress).为了在速度上的稳定性,我们需要有稳定的注料时间(在任何射出循环有稳定的注料时间)Inordertohavecontrolonconstantfilltime,weneedtouseabundantpressuredifferencebetweenpressureattransferandavailablemachinepressure-DeltaP.为了对稳定的注料时间进行控制,我们需要在移转的压力和可利用的机器压力之间使用大量的压力差-DeltaP142.PlasticFlowRatePlastic152.PlasticFlowRateTwoStageMolding成型二阶段Fillto95-99%on1ststage第一步注料95%-99%Packandholdon2ndStage第二步射饱和保压Velocitycontrol,deltaP速度控制,deltaPSwitchoverbyposition位置交换(V-P切换位置)Wewilldeterminethefollowingperimeters:我们将决定以下参数Cutoffposition,cushion,velocityandplasticpressureattransfer.切换位置,缓冲,速度和切换时之塑料压力FilltimeanddeltaP充填时间和deltaPPackingpressureandtime(Gatesealed&unsealed)保压压力和时间(浇口被密封或未封)Backpressureandscrewdelay背压和螺杆延迟时间Coolingandcycletime.冷却时间和成型周期152.PlasticFlowRateTwoStag162.PlasticFlowRateTwoStageMolding成型二阶段162.PlasticFlowRateTwoStag173.PlasticPressureFundamentals基本原理ItisveryimportanttodetermineplasticpressureattransferandDeltaP.在转换和DeltaP时决定正确的塑料压力是很重要的Alsodeterminethepressurelossoftheflowpath(Nozzle-Sprue-Runner-Gate-Part)也要决定流道的压力流失(喷嘴,注道-流道-浇口-成品)Machinecontrollersmustuseplasticpressure机器控制器必须使用塑料压力IntensificationRatio:强化比率:-Ratioofeffectivehydraulicramareatoscrewarea

-有效的液压缸区域与螺杆区域的比率-Ratioofmax.injectionpressuretomax.hyd.Pressure-最大的射入压力与最大液压比。-Usemachinegraph-使用机器图表173.PlasticPressureFundament184.CoolingRate&TimeCoolingTimeistheprofitkillinggiant冷却时间--是利润的最大杀手Injectioncyclecomponents;注射循环之组成:184.CoolingRate&TimeCoolin194.CoolingRate&TimeBasicsofCooling冷却的基本知识Radiation辐射--Moldradiatesenergyinalldirection模具在所有方向放热能量-Notusuallyvisible-通常不可视-Infraredwavescanbemonitored-红外线可被监测Convection对流-Energyisemittedthroughaircurrents-能量通过气流散发-Hotairrises,lessdense-热空气上升,较轻-Moldfacesseesanupdraft-模具正面有上升气流Conduction传导-Energyistransferredthroughcontact;likethroughcoolinglines-能量通过接触转移;如通过冷却管路-Themosteffectiveandtheonewecancontrol–是最有效的和我们能控制的-----It’sasciencebutoftendonepoorly

--是科学但经常很少有效的去执行194.CoolingRate&TimeBasics204.CoolingRate&TimeConductionCooling传导冷却:Dependson:依靠

-Turbulentflow;Reynolds#-乱流;雷诺号码-CoolingLineLocation冷却管路的位置-CleanChannels-干净的管道-Time-时间-Temperaturedifference-温度区别ReynoldsEquation(Nr):Reynolds公式(雷诺号码)

Nr=3160xQQ=GPMofcoolant冷却剂的GPM

DxnD=ChannelDiameter(in)管道直(吋)

n=KinematicViscosity动态黏度(cs)204.CoolingRate&TimeConduc214.CoolingRate&TimeReynolds’#for1/8”&5/16”IDMinimumNr32F50F80F100F140F214.CoolingRate&TimeReynol224.CoolingRate&TimeCoolingLineConnection冷却管路连接ParallelFlow平行流动

-Blockageinmulti-cavity-多洞穴之阻塞-UnevenflowthruChannels-通过管路时流量不均-MaximumCooling--最大值冷却-LargestGPMdemand最大的GPM需求-Leastdeltas:T&P-最少变数:时间&压力SeriesFlow串联流动

-Blockagefoundquickly-阻塞可迅速找到-EvenflowthruChannels-通过流道流量均匀-AverageCooling?DeltaT-平均冷却值-MinimumGPMdemand–最小值GPM需求-Maximumdeltas:T&P-最大变数:时间&压力224.CoolingRate&TimeCoolin234.CoolingRate&TimeCoolingIssues有关冷却的议题Uniformforeachcavity每穴位需均匀SameGPMforeachline各管路同样的GPMDeltaTshouldbemaximum4F最大DeltaT应该是4FLargerHosesthanmoldchannels水喉要比模子管路更大Useparallel/seriescombo使用并联与串联组合方式CoolingTimeisaffectedby:冷却时间受影响于:Howthickisthethickestsection最厚部分的厚度DeltaTbetweenplasticandmoldsteel在塑料和模金属之间的DeltaTStiffness&Thermalpropertiesoftheplastic塑料之硬度和热力特性ReleaseCharacteristics&Draftangles脱模特性和脱模角度Amountofejectionsurfacearea顶出面积的大小Coolantflowrate冷却剂的流动率

234.CoolingRate&TimeCoolin245.PlasticTemperatureHopper料斗Massflow大流量Uniformtemp;insulated一致溫度,需作绝缘Cleanitwithvacuum以真空清洗MaterialDryingusingdehumidifierat-40F.物料使用除湿乾燥机在-40F干燥。

245.PlasticTemperatureHopper255.PlasticTemperatureInjectionScrewshoulddelivermeltedplasticuniformly.螺杆必须均匀的把熔融射出L/Dratio:L/D比率-16:1isshort,poormeltquality!-16:1是很短的,很差的熔融质量!-24:1islong,bettermeltquality…..Critical24:1是长的,更好的熔融质量.....非常重要

-20:1minimum20:1最少值Compressionratio:压缩比-Flightdepthratio;feedtometeringsection进入深度比;进料到测量部分-Range:1.5:1to8:1范围:1.5:1到8:1-Highratiostendtoworktheplasticmore;highertemp高比率会使塑料工作更快;更高的温度255.PlasticTemperatureInject265.PlasticTemperatureTemperatureprofile温度特征Targetmidrangeofmfg.recommendations目标为使用原料商推荐范围之中间值Use800–1200psitoturnscrew用800–1200psi转动螺杆Mostenergytomeltplasticcomesfromscrewrotation(shearingeffect)多数熔化塑料的能量来自螺杆的转动(剪切热作用)Frontzoneshouldnotattempttochangemelttemperature前面区域不应该试图用来改变熔融温度WatchTemperaturecontrollerduringmolding:成型时要时常观察温度控制器Ifzoneoverridessetpoints如果区域超过设定点

-raiserearorcenterzone–提高后方或中心区域-slowscrewrpm–减慢螺杆rpm-lowerbackpressure–减低背压-removebarrelblanket--移除料桶的毯子?

265.PlasticTemperatureTemper276.CharacteristicstoMonitorFactorstoMonitor:主要监控因素:Pressureattransfer(V-P)切换时的压力Cushion缓冲FillTime充填时间Recoverytime恢复时间276.CharacteristicstoMonito287.MoldingWindowOptimizationProcessWindowStudy加工窗口研究TraditionallyHoldPressureandMeltTemperature(andMoldTempforSCMaterials)传统上保压和熔融温度(和sc物料的模具温度)AsdiscussedMelttemphasverylittleeffectonprocessability(shearrateisthemaincontroller)如讨论所说,熔融温度对加工能力很少有影响,剪切率是主要控制因素Dropmelttempfromstudy?放弃熔融温度的研究?Addhighandlowfillrate?增加高和低的填充率?287.MoldingWindowOptimizati298.AppendixAppendix附錄298.AppendixAppendix附錄30ShearRateFormulaForacircularorifice:對於圓形的管口WhereQisthevolumetricflowrateAndristheradiusoftheorificeQ是容量流速,r是管口的半徑So,duringthefirststage,shearrateisaffectedbythegeometryofthetoolandthevolumeofmeltenteringthecavityduringtheinjectiontime.因此,在第一階段,剪切率是受在射出期間,模具的幾何形狀和熔融進入模穴的容量所影響的4Qpr3剪切率ShearRate=30ShearRateFormulaForacirc31ShearRateforMachineForsimplicity,imaginemeasuringtheshearrateatthenozzleofanoldfashionedplungertypemoldingmachine:衝程Stroke=L灌咀半徑NozzleRadius=r射出時間InjectionTime=t料管半徑BarrelRadius=R簡單來說,想像在一種老的柱塞類型的成型機器的噴管上測量剪率31ShearRateforMachineForsi32ShearRateforMachine(cont.)Thenthevolumetricflowrateis:容量流速是:Q=(面積X長度)/時間Substitutingintotheshearrateformula,weget:代入剪切率公式,我們得到:tpR2LQ=4Qpr3ShearRate=4(pR2L/t)pr3=4R2Lr3t=AreaxLengthTime()32ShearRateforMachine(cont33EffectofStrokeonShearRateSo,ifthetoolandmachinearen’tvaried:所以,如果工具和機器不變化:Wherekisaconstantequalto4R2/r3k是恆定的等於4R2/r3

Inotherwords:ShearRateisdirectlyproportionaltothestrokeandinverselyproportionaltotheinjectiontime;changeeitherinisolationandtheShearRatechanges.換句話說:剪切率與衝程是成正比與射入時間成反比;單獨改變任何一方都會帶來剪切率變動Lt剪切率ShearRate=k.33EffectofStrokeonShearRaSymbolTechnologiesScientificInjectionMolding科学化射出成型

(ProcessOptimization)(过程最优化)JohnnySinghSymbolTechnologiesScientific35CONTENTS内容

Introduction简介

PlasticFlowRate塑料的流动率

PlasticPressurel

塑料的压力CoolingRateandTime冷却的速率和时间

PlasticTemperature塑料的温度

CharacteristicstoMonitor塑料特性之监控

MoldingWindowoptimizationl

成型窗口最优化Appendix附注2CONTENTS内容Introduction简介361.IntroductionScientificInjectionMoldingEnsuresthatidenticalpartsareproducedconsistentlyindependentofthenormalmachinetomachine,daytodayandlottolotvariations保证相同部件生产的一致性,不受一般的不同机器,生产批号,日期之变异所影响Scientificapproachtoestablishallmoldingvariables以科学的方法来建立所有成型的变异数Providesabilitytodetectanddocumentproblemsbasedondata-notpersonalopinions能够用数据化的方式来侦测和纪录问题点,而不是靠个人观点Canincreaseprofitmarginby20to50%能够提高利润20%到50%31.IntroductionScientificInj371.IntroductionProfitpercentage(利潤百分比)41.IntroductionProfitpercent38EffectofCycleTimeonProfit(成型周期对利润的影响)PartWeight(gm)(部件重量)Material(材料)ApproxCostperlb(1b的大约成本)MaterialCost–Cents(物料成本—分)CycleTime(周期)MachineRate$/hr(机械速率)CycleTimeCost–Cents(周期成本—分)ActualPlasticCost(实际塑料成本)OverheadsandLabor(管销和人力)Profitat5%-Cents(利润5%)分PercentofQuotedPriceProfit(报价利润率)50PC/ABS

$3.0033.320.0

$30.0016.750.060.55.5210050PC/ABS

$3.0033.322.5

$30.0018.852.163.03.4462.350PC/ABS

$3.0033.325.0

$30.0020.854.265.51.3624.61.Introduction5EffectofCycleTimeonProfi391.IntroductionFourCriticalcomponentstomakeagoodpart做出好成品的四大重要成分PartDesign(成品设计)Materialselectionandhandling(材料选择和处理方式)Tooldesignandconstruction(模具设计和结构)Processing(加工制程)InProcessing,thefourmainplasticvariables(加工中的四大塑料变异因素)PlasticFlowRate(塑料流动率)PlasticPressure塑料压力CoolingRate&Time冷却速率和时间PlasticTemperature塑料温度61.IntroductionFourCritical402.PlasticFlowRateFundamentals基本性Itsflowpatternislikefountainflow塑料流动模式类似于喷泉流动模式Chainendssticks&freezetowall,thusformingfrozenlayers.流体末端会附着、凝固在侧壁,形成凝固层Directlyproportionaltoshearrate;highertheshear,fastertheflow与剪切率比例成正比:剪切率越高,流动率越快Inverselyproportionaltoviscosity;lowertheviscosity,fastertheflow与黏度比例成反比:黏度越低,流动率越快BigmisunderstandingaboutMFR,itdoesNOTcorrelatetoprocessability

对MFR的误解,它与加工能力无关Whatdoesitaffect?它的影响72.PlasticFlowRateFundament412.PlasticFlowRateTypicalPlasticFlow典型的塑膠流動率StiffEasySlowFast82.PlasticFlowRateTypicalP422.PlasticFlowRateTypicalPlasticFlow典型的塑膠流動StiffEasySlowFastNonNewtonianMixedNewtonian92.PlasticFlowRateTypicalP432.PlasticFlowRateNewtonianfluidscanbedefinedasthoseforwhichviscosityisaconstantregardlessofshearstressorrateofshear.牛顿流体可被定义为黏度是一个常数,不随着剪切应力或剪切率变化的流体。Non-Newtonianfluidsarethoseforwhichviscosityisnotaconstant,butvariesbasedupontherateofshearortheshearstress.非牛顿流体是那些黏度不是一个常数,而是随着剪切应力或剪切率变化的流体102.PlasticFlowRate442.PlasticFlowRateMomentumEffect慣性作用StiffEasySlowFastElectric電力Hydraulic水力112.PlasticFlowRateMomentum452.PlasticFlowRateMFREffectMFR效應StiffEasySlowFast11.5MFR6MFRMFR10gm/10minutes.ShearRate1/10/60=.007Machineflowrate30gmin.5sec=3/.05=60122.PlasticFlowRateMFREffe462.PlasticFlowRateMeltTempEffect融熔溫度效應StiffEasySlowFast525degF425degF132.PlasticFlowRateMeltTem472.PlasticFlowRatePlasticViscosityVaries塑料黏度的变化与以下有关Withinjectionspeed与射出速度Lotchanges,temperature生产批号变化,温度%regrind,colorants再生料%,抽料制程Screwrotatetime螺杆旋转速度-Butthesecanbeminimizedbyvelocitycontrol但这些可经速度控制减到最小Whatelsechangestheviscosity?其他改变黏度的因素:Inordertohavecruisecontrolonvelocity,weneedtohaveconstantfilltime(samefilltimeonanypress).为了在速度上的稳定性,我们需要有稳定的注料时间(在任何射出循环有稳定的注料时间)Inordertohavecontrolonconstantfilltime,weneedtouseabundantpressuredifferencebetweenpressureattransferandavailablemachinepressure-DeltaP.为了对稳定的注料时间进行控制,我们需要在移转的压力和可利用的机器压力之间使用大量的压力差-DeltaP142.PlasticFlowRatePlastic482.PlasticFlowRateTwoStageMolding成型二阶段Fillto95-99%on1ststage第一步注料95%-99%Packandholdon2ndStage第二步射饱和保压Velocitycontrol,deltaP速度控制,deltaPSwitchoverbyposition位置交换(V-P切换位置)Wewilldeterminethefollowingperimeters:我们将决定以下参数Cutoffposition,cushion,velocityandplasticpressureattransfer.切换位置,缓冲,速度和切换时之塑料压力FilltimeanddeltaP充填时间和deltaPPackingpressureandtime(Gatesealed&unsealed)保压压力和时间(浇口被密封或未封)Backpressureandscrewdelay背压和螺杆延迟时间Coolingandcycletime.冷却时间和成型周期152.PlasticFlowRateTwoStag492.PlasticFlowRateTwoStageMolding成型二阶段162.PlasticFlowRateTwoStag503.PlasticPressureFundamentals基本原理ItisveryimportanttodetermineplasticpressureattransferandDeltaP.在转换和DeltaP时决定正确的塑料压力是很重要的Alsodeterminethepressurelossoftheflowpath(Nozzle-Sprue-Runner-Gate-Part)也要决定流道的压力流失(喷嘴,注道-流道-浇口-成品)Machinecontrollersmustuseplasticpressure机器控制器必须使用塑料压力IntensificationRatio:强化比率:-Ratioofeffectivehydraulicramareatoscrewarea

-有效的液压缸区域与螺杆区域的比率-Ratioofmax.injectionpressuretomax.hyd.Pressure-最大的射入压力与最大液压比。-Usemachinegraph-使用机器图表173.PlasticPressureFundament514.CoolingRate&TimeCoolingTimeistheprofitkillinggiant冷却时间--是利润的最大杀手Injectioncyclecomponents;注射循环之组成:184.CoolingRate&TimeCoolin524.CoolingRate&TimeBasicsofCooling冷却的基本知识Radiation辐射--Moldradiatesenergyinalldirection模具在所有方向放热能量-Notusuallyvisible-通常不可视-Infraredwavescanbemonitored-红外线可被监测Convection对流-Energyisemittedthroughaircurrents-能量通过气流散发-Hotairrises,lessdense-热空气上升,较轻-Moldfacesseesanupdraft-模具正面有上升气流Conduction传导-Energyistransferredthroughcontact;likethroughcoolinglines-能量通过接触转移;如通过冷却管路-Themosteffectiveandtheonewecancontrol–是最有效的和我们能控制的-----It’sasciencebutoftendonepoorly

--是科学但经常很少有效的去执行194.CoolingRate&TimeBasics534.CoolingRate&TimeConductionCooling传导冷却:Dependson:依靠

-Turbulentflow;Reynolds#-乱流;雷诺号码-CoolingLineLocation冷却管路的位置-CleanChannels-干净的管道-Time-时间-Temperaturedifference-温度区别ReynoldsEquation(Nr):Reynolds公式(雷诺号码)

Nr=3160xQQ=GPMofcoolant冷却剂的GPM

DxnD=ChannelDiameter(in)管道直(吋)

n=KinematicViscosity动态黏度(cs)204.CoolingRate&TimeConduc544.CoolingRate&TimeReynolds’#for1/8”&5/16”IDMinimumNr32F50F80F100F140F214.CoolingRate&TimeReynol554.CoolingRate&TimeCoolingLineConnection冷却管路连接ParallelFlow平行流动

-Blockageinmulti-cavity-多洞穴之阻塞-UnevenflowthruChannels-通过管路时流量不均-MaximumCooling--最大值冷却-LargestGPMdemand最大的GPM需求-Leastdeltas:T&P-最少变数:时间&压力SeriesFlow串联流动

-Blockagefoundquickly-阻塞可迅速找到-EvenflowthruChannels-通过流道流量均匀-AverageCooling?DeltaT-平均冷却值-MinimumGPMdemand–最小值GPM需求-Maximumdeltas:T&P-最大变数:时间&压力224.CoolingRate&TimeCoolin564.CoolingRate&TimeCoolingIssues有关冷却的议题Uniformforeachcavity每穴位需均匀SameGPMforeachline各管路同样的GPMDeltaTshouldbemaximum4F最大DeltaT应该是4FLargerHosesthanmoldchannels水喉要比模子管路更大Useparallel/seriescombo使用并联与串联组合方式CoolingTimeisaffectedby:冷却时间受影响于:Howthickisthethickestsection最厚部分的厚度DeltaTbetweenplasticandmoldsteel在塑料和模金属之间的DeltaTStiffness&Thermalpropertiesoftheplastic塑料之硬度和热力特性ReleaseCharacteristics&Draftangles脱模特性和脱模角度Amountofejectionsurfacearea顶出面积的大小Coolantflowrate冷却剂的流动率

234.CoolingRate&TimeCoolin575.PlasticTemperatureHopper料斗Massflow大流量Uniformtemp;insulated一致溫度,需作绝缘Cleanitwithvacuum以真空清洗MaterialDryingusingdehumidifierat-40F.物料使用除湿乾燥机在-40F干燥。

245.PlasticTemperatureHopper585.PlasticTemperatureInjectionScrewshoulddelivermeltedplasticuniformly.螺杆必须均匀的把熔融射出L/Dratio:L/D比率-16:1isshort,poormeltquality!-16:1是很短的,很差的熔融质量!-24:1islong,bettermeltquality…..Critical24:1是长的,更好的熔融质量.....非常重要

-20:1minimum20:1最少值Compressionratio:压缩比-Flightdepthratio;feedtometeringsection进入深度比;进料到测量部分-Range:1.5:1to8:1范围:1.5:1到8:1-Highratiostendtoworktheplasticmore;highertemp高比率会使塑料工作更快;更高的温度255.PlasticTemperatureInject595.PlasticTemperatureTemperatureprofile温度特征Targetmidrangeofmfg.recommendations目标为使用原料商推荐范围之中间值Use800–1200psitoturnscrew用800–1200psi转动螺杆Mostenergytomeltplasticcomesfromscrewrotation(shearingeffect)多数熔化塑料的能量来自螺杆的转动(剪切热作用)Frontzoneshouldnotattempttochangemelttemperature前面区域不应该试图用来改变熔融温度WatchTemperaturecontroll