双色成形材料搭配

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1、Multi-materialtechnologyTheinjectionmoldingofpartswithdifferentmaterial/colorcombinationshasbeenknownformanyyears.Todaytheutilizationofdifferentmaterialcombinationsisincreased,figure1:Figure1:Differentmaterial/colorcombinationsThecombinationoftwoormorematerialsisac

2、hievedbyanumberoftechniques.Thesemaybecharacterizedasmould-controlledormachine-controlledprocesses.Mould-controlledprocessesOvermolding32Twoormorematerialsareinjectedintodifferentcavitiesorintotwoormoremouldswhichmustbeopenedandclosedbetweeneachinjectionstep.Thepri

3、ncipleisshowninfigure2.41Figure2:TwoormoremouldswitharotatingsystemThemouldismountedonarotarytablefittedtothemachine.Material1,2and3areinjectedintothemouldsA,BandC.Afterthemouldopens,themoldingstaysinthemovinghalfandisrotatingtogetherwiththemould-halftolineupwithca

4、vityABCintowhichthefourthmaterialisinjectedbyinjectionunit4.Themould-halvesonthemovingplatenareidentical,whilethoseonthefixedplatenaredifferent.EachtimethemouldopensafinishedcomponentisejectedfromcavityABC.Foranexampleseefigure3.N9Figure3:ExampleofovermoldingMulti-

5、componentmoldingThisaanothermould-controlledprocess.Incontrasttoovermolding,asinglemouldorcavityisusedwhichhasmovinginsertswhichblockoffoneormorepartsofthecavityatthestartoftheinjectionprocess.Thefirstpolymerisinjectedintothemould,onlyfillingthefirstpartofthecavity

6、withmaterial.Afewsecondsafterinjectionofthefirstmaterial,coresormovinginsertsinthemouldareactivatedintowhichthesecondpolymeristheninjected.Theprincipleisshowninfigure4.4A4BFigure4A:Injectionofmaterial1intothefirstpartofcavity,secondpartofcavityblockedbymovingslide.

7、Figure3B:Injectionofmaterial2intosecondpartofcavity.Limitstothepossibleapplicationsofthisprocessareonlysetbythegeometryoftheproduct.Examplesofmulti-componentinjectionmoldingareshowninfigure5.Figure5:ExamplesofcompositeinjectionmoldingMachine-controlledprocessesSand

8、wichinjectionmoldingIncontrasttothetechniquesdiscussedabove,sandwichinjectionmoldingisamachine-controlledprocess.Themouldusedisaconventionalinjec