Plastic Design Guide

EngineeringPolymers/DuPont(Korea)Inc.1DesignGuidelinesNov.24.2004TechnicalCenter/EngineeringPolymersDuPont(Korea)Inc.Version1.0EngineeringPolymers/DuPont(Korea)Inc.2DesignConceptDesignFlowCAECADEngineeringPolymers/DuPont(Korea)Inc.3TypicalWallThicknessForEngineeringPolymersGeneralapplications12345670millimetricscaleSpecialapplicationsEngineeringPolymers/DuPont(Korea)Inc.4GateLocation&StrengthGate050100150200250300TensionCompressionFlowTranverseMPaZYTEL70G3323C,DAMTensileStrengthEngineeringPolymers/DuPont(Korea)Inc.5GateLocation&ShrinkageGateMaterialFlowAffectsOrientationFlowDirectionTransverseDirectionEngineeringPolymers/DuPont(Korea)Inc.6GateLocation&ShrinkageUnreinforcedHigherShrinkageinDirectionofMolecularOrientation/FlowGateFlowDirectionTransverseDirectionEngineeringPolymers/DuPont(Korea)Inc.7GateLocation&ShrinkageGateFlowDirectionTransverseDirectionGlassReinforcedGlassFiberResistsShrinkageinDirectionofAlignment/FlowEngineeringPolymers/DuPont(Korea)Inc.8GateLocation&ShrinkageGateFlowDirectionTransverseDirectionMineralReinforcedMineralResistsShrinkageMoreUniformlyinAllDirectionsEngineeringPolymers/DuPont(Korea)Inc.9Shrinkage&WarpageShrinkageIncreaseswithWallThicknessHigherShrinkageLowerShrinkageEngineeringPolymers/DuPont(Korea)Inc.10Shrinkage&WarpageUnevenShrinkageEngineeringPolymers/DuPont(Korea)Inc.11Shrinkage&WarpageBadFlatnessEngineeringPolymers/DuPont(Korea)Inc.12Shrinkage&WarpageGoodFlatnessEngineeringPolymers/DuPont(Korea)Inc.13Shrinkage&WarpageCaseona‘plate+rib’profilebGatehwaFlowangleIsochronesLGateEngineeringPolymers/DuPont(Korea)Inc.14Shrinkage&WarpageSSinflowShrinkage(S)SSThinThickba1234Wallthickness[mm]Shrinkage[%]TransversetoflowInflow1.5GlassreinforcedmaterialsDeformationtrendEngineeringPolymers/DuPont(Korea)Inc.15Shrinkage&WarpageSSinflowShrinkage(S)SSThinThick1234Wallthickness[mm]Shrinkage[%]TransverseInFlow1.5baDeformationtrendUnreinforcedmaterialsEngineeringPolymers/DuPont(Korea)Inc.16GateLocation&ShrinkageBadGateLocationGateEngineeringPolymers/DuPont(Korea)Inc.17GateLocation&ShrinkageFlowStepsEngineeringPolymers/DuPont(Korea)Inc.18Shrinkage&WarpageGateGlassreinforcedmaterialsEngineeringPolymers/DuPont(Korea)Inc.19Shrinkage&WarpageEffectofMachineSettingsonShrinkageEngineeringPolymers/DuPont(Korea)Inc.20Shrinkage&WarpageNon-uniformwallsWrongRightEngineeringPolymers/DuPont(Korea)Inc.21SizingtoReduceWarpageMaxRReduceStressConc.ReduceWarpageTT2Bow-InShrinkage&WarpageEngineeringPolymers/DuPont(Korea)Inc.22Shrinkage&WarpageNon-uniformWallThicknessContributesTo•HigherMolded-inStress•Warpage•Sinks•VoidsSinkVoidInThickerSectionEngineeringPolymers/DuPont(Korea)Inc.23Shrinkage&WarpageOutsideRadiusFollowsInsideRadiusEngineeringPolymers/DuPont(Korea)Inc.24GoodDesign3TGateGateBadTBetterBestEngineeringPolymers/DuPont(Korea)Inc.25Shrinkage&WarpageCoolingSidetoSideHOTCOOLTOOLPARTEngineeringPolymers/DuPont(Korea)Inc.26SizingtoReduceStressConcentrationFactor(SCF)R/TStressConcentrationFactor3.02.52.01.51.000.20.40.60.81.01.21.4P=AppliedLoadR=FilletRadiusT=ThicknessEngineeringPolymers/DuPont(Korea)Inc.27SharpCornersSHARPCORNERSEngineeringPolymers/DuPont(Korea)Inc.28WeldLine&Strength1Gate2GateWeldLineEngineeringPolymers/DuPont(Korea)Inc.29WeldLine&StrengthTensileStrengthWeldLinevs.FlowDirection020406080100120140160180ZYTEL70G33MINLON22CRYNITE530FlowDirectionKnitLineMPa23C,50%RHEngineeringPolymers/DuPont(Korea)Inc.30WeldLine&StrengthMaterialTypeFillerTypeTensileStrengthMPa%RetainedNylon66Nylon66PolypropPolypropNone40%GlassNone30%Glass79199376977103322397528634OneGateTwoGateEngineeringPolymers/DuPont(Korea)Inc.31WeldLine&StrengthWeldline,exampleFlowFlowEngineeringPolymers/DuPont(Korea)Inc.32WeldLine&StrengthGateWeldLineEngineeringPolymers/DuPont(Korea)Inc.33GateWeldLine&StrengthWeldLineImprovedDesignEngineeringPolymers/DuPont(Korea)Inc.34SinksRibsandSinksEngineeringPolymers/DuPont(Korea)Inc.35SinksRibsandSinks0.5T(max.0.75T)Rmax.0.5TbetterD2TTR=TDshouldbeimproved1Sinkmark3TEngineeringPolymers/DuPont(Korea)Inc.36SinksImprovedSinksGrainedorStippledSurfaceTooledDepressionOffsetatRibSinkEngineeringPolymers/DuPont(Korea)Inc.37SinksRibsDesignBetterBestshouldbeimprovedEngineeringPolymers/DuPont(Korea)Inc.38GoodDesign,StrengthEngineeringPolymers/DuPont(Korea)Inc.39GoodDesign,Strength1X1.5X13.3X27X30XRelativeTorsionalStiffnessEngineeringPolymers/DuPont(Korea)Inc.40Bad&GoodDesign,ExampleEngineeringPolymers/DuPont(Korea)Inc.41Bad&GoodDesign,ExampleEngineeringPolymers/DuPont(Korea)Inc.42Bad&GoodDesign,ExampleEngineeringPolymers/DuPont(Korea)Inc.43Bad&GoodDesign,ExampleEngineeringPolymers/DuPont(Korea)Inc.44Bad&GoodDesign,ExampleEngineeringPolymers/DuPont(Korea)Inc.45Bad&GoodDesign,ExampleEngineeringPolymers/DuPont(Korea)Inc.46GoodDesign,ExampleSteelPlasticEngineeringPolymers/DuPont(Korea)Inc.47GoodDesign,Example