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1、PolymericFoamingSimulationforExtrusionProcessesMITSUTAKASHIMODA,1,*ISAOTSUJIMURA,2MASATAKATANIGAKI1ANDMASAHIROOHSHIMA11DepartmentofChemicalEngineering,KyotoUniversity,Sakyo-ku,Kyoto,606-8501Japan2ProcessingTechnicalResearchGroup,KanekaCorporation,5-1-1Torigai,Settsu,Osaka,566-0072JapanABST
2、RACT:Anumericalsimulationforpolymericfoamingextrusionprocesseswasconducted.Combiningclassicalnucleationrateandbubblegrowthmodelswithanon-Newtonianfluidmodelofaflow,asimultaneousbubblenucleationandgrowthbehaviorinaflowfieldwassimulated.Simulationresultswerecomparedwiththeexperimentaldataobt
3、ainedbyvisualobserva-tionsatafoamingextruder,whereapolypropyleneresinwasphysicallyfoamed.Theeffectsofphysicalparametersinfoamingmodelonbubblesizeandnumberdensitycalculationwereintensivelyexaminedbysensitivityanalysis.1.INTRODUCTIONhemethodoffoamingpolymerresinscanberoughlydividedintoTtwoca
4、tegories;physicalandchemical.Inphysicalfoamingprocesses,dissolvingagasintopolymerasaphysicalblowingagentataspecifiedtemperatureandpressurecreatesfoams:Oncethedissolutioniscompleted,eitherthepressureisreducedorthetemperatureisincreasedsoastoliberatethedissolvedgas.InchemicalfoamingThisrevis
5、edpaperwaspresentedinitsoriginalformattheFoams2000SecondInterna-tionalConferenceonThermoplasticFoamheldinParsippany,NJ,October24–25,2000.Thisconferencewasco-sponsoredbytheSocietyofPlasticsEngineers(SPE)andtheNewark/PalisadesSectionofThermoplasticMaterialsandFoamsDivisionoftheSPEandthecopyr
6、ightisheldbytheSocietyofPlasticsEngineers.*Authortowhomcorrespondenceshouldbeaddressed.E-mail:oshima@cheme.kyoto-u.ac.jpJOURNALOFCELLULARPLASTICSVolume37—November20015170021-955X/01/060517-20$10.00/0DOI:10.1106/W4C0-CAG6-H3FM-LTJP©2001SagePublicationsDownloadedfromcel.sagepub.comatPRINCETO
7、NUNIVLIBRARYonJanuary18,2016518MITSUTAKASHIMODAETAL.processes,foamsarecreatedbydecomposingachemicalblowingagent(CBA)thathasbeenincorporatedintoapolymer.Atacertaintemperatureandpressure,achemicalreactionreleasesthefoaminggas,suchasnitrogenandcarbondioxide.Ineit
