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1、山东科技大学硕士学位论文摘要ABSTRACTPEThaslargeoutput,lowprices,heatresistance,chemicalresistance,abrasionresistance,electricalinsulationandotheradvantages.Ithasawideapplicationspaceinindustrialproduction,andthereforeithascausedtheextensiveconcerntoresearchonPETprocessingtec
2、hnologyandmoldingprocess.Inthispaper,basedonplasticextrusiontheory,polymermeltflowinsheetdiewassystematicallysimulatedthroughcombiningpolymerrheology,computationalfluiddynamicsandplasticprocessing.Polymermeltflowlawsinrectangularsheetextrusiondieandcoat-hangers
3、heetdieweresimulatedandanalyzedbyPOLYFLOWsoftware.Thedistributionofpressurefield,velocityfieldandtemperaturefieldwereobtained.Thesimulationandanalysisofpolymercoextrusionwasperformedandthechangingpositionofthecoextrusionsheetfreeboundarywasobtained.Forrectangul
4、arsheetextrusiondie,extrusionswellwassimulatedanddieoptimizationwasperformed.Meanwhile,factorsaffectingthedesignofextrusiondie-velocityexportuniformityandinletvolumetricflowratewerediscussedthoroughly.TheinfluenceoftheCrossindexandinletvolumetricflowrateonthedi
5、stributionofpolymermeltpressureandvelocitywasanalyzedinthesimulation.Forthecoat-hangerdiesusedwidely,theinfluenceofmanifoldexpansionangle,theentrancelengthandfan-shapedtransitionzonelengthonthedistributionofpolymermeltspressure,velocityandtemperatureareresearch
6、ed.Theinfluenceofinletvolumetricflowrateandthedieflowchannelconvergenceangleonthefreeboundarywereresearchedinthepolymercoextrusionsimulation.Thecorrespondinglawswhichcanguidethemoldingprocessandmolddesignwereobtainedbysimulationtechnology.Theextrusionswellpheno
7、menonofPETsheetisobvious.Whendesigningmold,itshouldbefullytakenpolymerextrusionswelleffectsintoaccount.Thisproblemcanbesolvedbythereverseextrusionfunction.WiththeincreaseoftheCrossindexandtheinletvolumetricflowrate,themeltpressureandvelocityincrease.Theinfluenc
8、eofmanifoldexpansionangleonthemeltspressureandvelocityissignificant,buttheinfluence山东科技大学硕士学位论文摘要onthemeltstemperaturedistributionisnotobvious.Themeltsphysicalfielddistribut