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1、双螺杆挤出机工作原理（Workingprincipleoftwinscrewextruder）Extrusionmoldingisakindofprocessingmethodwhichhasthelargestvariety,themostchange,thehighproductivity,thestrongadaptability,thewideapplicationandthelargestproportionofoutputinthefieldofpolymerprocessing.Extrusionmoldingistomakethemelt(o
2、rviscousfluid)ofpolymermeltthroughtheextrusionoftheextruderscrewthroughacertainshapeofthemouthmold,theproductisacontinuousprofilewithaconstantcross-sectionshape.Theextrusionmoldingprocessofpolymermaterialssuitableforall.Almostallthermoplasticscanbeformed,andthermosettingplasticscan
3、alsobeused,butonlyafewthermosettingresinssuchasphenolics.Plasticextrusionproductsarepipes,plates,bars,sheets,films,monofilament,cablecoating,allkindsofprofiles,aswellasplasticandothermaterialssuchascomposite.Atpresent,about50%ofthethermoplasticplasticproductsbyextrusionmolding.Inad
4、dition,mixingtechnologyiscommonlyusedinplasticscoloring,mixing,plasticizing,granulationandmodificationofplastics,byextrusionmoldingasthefoundation,withblowinganddrawingtechnology,andforthedevelopmentofextrusionblowmoldingandextrusionmoldingandblowmoldingdrawingmanufacturingBOPPfilm
5、andotherproducts.Theextrusionmoldingisthemostimportantmethodinpolymermolding.Extrusionequipmentwithascrewextruderandaplungerextrudertwocategories,theformerforthecontinuousextrusion,theintermittentextrusionmoldingmaterialismainlyusedforhighviscosity,suchasPTFE,ultrahighmolecularweig
6、htpolyethylene.Canbedividedintosinglescrewextruderandmultiscrewextruderscrewextruder.Thesinglescrewextruderistheproductionofthemostbasicextruder.Forthefastestdevelopmentinrecentyearsinthetwin-screwextrudermultiscrewextruder,itsapplicationisextensive.Atpresent,intheprocessingofPVCpl
7、asticdoorandwindowprofiles,twin-screwextruderhasbecomethemainproductionequipment,singlescrewextruderwillbephasedout.Butintheextrusionprocessingofotherpolymers,isstilldominatedbysinglescrewextruder.Thetwohavetheirowncharacteristics:Singlescrewextruder:Thestructureissimpleandtheprice
8、islow.-suitableforpolymere
