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1、J.Mater.ShapingTechnol.(1987)5:17-2191987SpringeroVerlagNewYorkInc.ProcessingandDesigningPartsUsingStructuralReactionInjectionMoldingJ.H.EcklerandT.C.WilkinsonAbstract.Anewprocesscalledstructuralreactioninjectionmolding(SRIM)hasbeendevelopedtocombinethehighstr
2、engthandmoduluspropertiesoffiberreinforcedcompositeswiththeadvantagesofthereactioninjectionmoldingprocess.Alongwiththeprocess,anewreactiveresinhasbeendevelopedexpresslyforthestructuralRIMprocess.WiththenewresinandSRIMprocessconventionaldesignmethodscanbeused,bu
3、tthedesignermustalsoconsiderseveralfacetsofthestructuralRIMprocess.INTRODUCTIONwithshapecanbelight,yetverystrong.Beadsandlipsonpartsaddstiffness.Morecomplicateddesigns,Structuralreactioninjectionmolding(SRIM)isarel-suchaschannels,bosses,ribs,andcylinders,maybea
4、tivelynewprocesscombiningthehighproductionratesmoldedusingpreformedreinforcements.ComplicatedofRIMwiththestrong,highmoduluspropertiesfordesignsmaybeeliminatedusinginnovativeengineer-partsmadebyRIM.StructuralRIMusesconventionalingdesigntechniques.RIMprocessingeq
5、uipmentandmolds.Unlike"ure-thane"RIM,longreinforcingfiberscanbeusedforSRIM,yieldingincreasedstiffness,toughness,andSTRUCTURALREACTIONINJECTIONstrength.StructuralRIMmaterialsarerelativelylowMOLDINGinviscosity,permittingrapidmoldfillingwithoutdis-turbingtheprepla
6、cedreinforcement.Inaddition,SRIMStructuralRIMcombinesthestrong,highmodulusmaterialscanbeformulatedtoreactfastforhighpro-propertiesofpolymer/fiberreinforcedcompositeswithductionrates.thehighproductionratesandeaseofRIM.Like(RTM),Asthenameimplies,SRIMcompositesare
7、stronger(SMC),andpre-impregnatedmolding,SRIMuseslongandmorerigidthanurethanepartsmadeusingcon-reinforcingfibersforhighstrengthandmodulus.ventionalRIM.StrengthsandmoduliofcommonSRIMStructuralRIMuseslowviscosityreactantsthatcancompositesaretwototenormoretimesthes
8、trongestbeinjectedquickly,thenreactfast.Inaddition,inSRIMreinforcedRIMmaterials.Resistancetohightemper-thealignmentorpositioningoffiberscanbeprede-atureallowsSRIMpartstobeus
