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JOURNALOFMATERIALSPROCESSINGTECHNOLOGY187–1882007690–693ADAPTIVESYSTEMFORELECTRICALLYDRIVENTHERMOREGULATIONOFMOULDSFORINJECTIONBNARDINA,∗,BˇZAGARA,∗,ASLOVENIA,ABSTRACTDITIONSMEANSMOULDITWPATENTONLINEINFLUENCECONTROL2006ELSEVIERBVALLRIGHTSRESERVEDKSIMULATIONS1DEVELOPMENTOFTECHNOLOGYOFCOOLINGMOULDSVIATHERMOELECTRICALTEMMEANSDERIVESOUTOFTHEINDUSTRIALPRAXISANDPROBLEMS,IEATDESIGN,TOOLMAKINGANDEXPLOITATIONOFTOOLSCURRENTCOOLINGTECHNOLOGIESHAVETECHNOLOGICALLIMITATIONSTHEIRFINITEPLETELYRETROLLABLEINGTECHNOLOGIESENINGONLYTIONAND11PRPLASTICPROCESSINGISBASEDONHEATTRANSFERBETWEENPLASTICMATERIALANDMOULDCAVITYWITHINCALCULATIONOFHEATTRANSFERONESHOULDCONSIDERTWOMAJORFACTSFIRSTISALLUSEDENERGY09240136/DOILIMITATIONSCANBELOCATEDANDPREDICTEDINADVANCEWITHELEMENTANALYSESFEASIMULATIONPACKAGESBUTNOTCOMAVOIDEDRESULTSOFADIVERSESTATEOFTHEARTANALYSESVEALEDTHATALLEXISTINGCOOLINGSYSTEMSDONOTPROVIDECONHEATTRANSFERCAPABILITIESADEQUATETOFITINTODEMANDTECHNOLOGICALWINDOWSOFCURRENTPOLYMERPROCESSINGPOLYMERPROCESSINGISNOWADAYSLIMITEDINTERMOFSHORTTHEPRODUCTIONCYCLETIMEANDWITHINTHATREDUCINGCOSTSWITHHEATCAPACITYMANIPULATIONCAPABILITIESOTHERPRODUCOPTIMIZATIONCAPABILITIESAREALREADYDRIVENTOMECHANICALPOLYMERPROCESSINGLIMITATIONS3∗CORRESPONDINGAUTHORSTEL3863490920;FAX38634264612EMAILADDRESSBLAZNARDINTECOSSIBNARDINWHICHISBASEDONFIRSTLAWOFTHERMODYNAMICSLAWOFENERGYCONSERVATION1,SECONDISVELOCITYOFHEATTRANSFERBASICTASKATHEATTRANSFERANALYSESISTEMPERATURECALCULATIONOVERTIMEANDITSDISTRIBUTIONINSIDESTUDIEDSYSTEMTHATLASTDEPENDSONVELOCITYOFHEATTRANSFERBETWEENTHESYSTEMANDSURROUNDINGSANDVELOCITYOFHEATTRANSFERINSIDETHESYSTEMHEATTRANSFERCANBEBASEDASHEATCONDUCTION,CONVECTIONANDRADIATION112COOLINGTIMECOMPLETEINJECTIONMOULDINGPROCESSCYCLECOMPRISESOFMOULDCLOSINGPHASE,INJECTIONOFMELTINTOCAVITY,PACKINGPRESSUREPHASEFORCOMPENSATINGSHRINKAGEEFFECT,COOLINGPHASE,MOULDOPENINGPHASEANDPARTEJECTIONPHASEINMOSTCASES,THELONGESTTIMEOFALLPHASESDESCRIBEDABOVEISCOOLINGTIMECOOLINGTIMEININJECTIONMOULDINGPROCESSISDEFINEDASTIMENEEDEDTOCOOLDOWNTHEPLASTICPARTDOWNTOEJECTIONTEMPERATURE1–SEEFRONTMATTER2006ELSEVIERBVALLRIGHTSRESERVED101016/JJMATPROTEC200611052ATECOS,TOOLANDDIEDEVELOPMENTCENTREOFBFACULTYOFELECTRICALENGINEERINGONEOFTHEBASICPROBLEMSINTHEDEVELOPMENTANDPRODUCTIONPROCESSINTHEMOULDPRECISESTUDYOFTHERMODYNAMICPROCESSESINMOULDSSUCHSYSTEMUPGRADESCONVENTIONALCOOLINGSYSTEMSWITHINTHEINTHEPAPER,THEAUTHORSWILLPRESENTRESULTSOFTHERESEARCHPROJECT,WHICHTHETESTINGSTAGE,THEPROTOTYPESTAGEANDTHEINDUSTRIALIZATIONPHASETHERMOREGULATIONOFTHEMOULDOVERTHECYCLETIMEANDOVERALLPRESENTEDAPPLICATIONCANPRESENTAMILESTONEINTHEFIELDOFMOULDTEMPERATUREEYWORDSINJECTIONMOULDING;MOULDCOOLING;THERMOELECTRICMODULES;FEMINTRODUCTION,DEFINITIONOFPROBLEMMOULDINGGLOJEKA,DKRIˇZAJBKIDRIˇCEVACESTA25,3000CELJE,SLOVENIA,LJUBLJANA,SLOVENIAOFMOULDSFORINJECTIONMOULDINGISTHECONTROLOFTEMPERATURECONSHOWED,THATHEATEXCHANGECANBEMANIPULATEDBYTHERMOELECTRICALORCANBEASTANDALONEAPPLICATIONFORHEATMANIPULATIONWITHINASCARRIEDOUTINTHREEPHASESANDITSRESULTSAREPATENTEDINA686\2006WILLBEPRESENTEDTHEMAINRESULTSOFTHEPROJECTWERETOTALANDRAPIDONQUALITYOFPLASTICPRODUCTWITHEMPHASISONDEFORMATIONANDPRODUCTQUALITYCONTROLDURINGTHEINJECTIONMOULDINGPROCESSTHERMALPROCESSESININJECTIONMOULDINGPLASTICOCESSINGBNARDINETAL/JOURNALOFMATERIALSPROCESSINGTECHNOLOGY187–1882007690–693691COOLINGFROMMOULDANDTEMPERATUREFROM2ENTMOSTIELINES,ACCUMULATEDTOITYINTOALTERLIKINTETHEERTIESWITHATUREINDEPENDENTDONEFROMSIMULATIONTEM21WTRICALTHEFIG2TEMBLOCKDIAGRAMNOWNEVERUSEDINTHEINJECTIONMOULDINGAPPLICATIONSTEMMODULESEEFIG2ISADEVICECOMPOSEDOFPROPERLYARRANGEDPAIRSOFPANDNTYPESEMICONDUCTORSTHATAREPOSITIONEDBETWEENTWOCERAMICPLATESFORMINGTHEHOTANDTHECOLDTHERMOELECTRICCOOLERSITESPOWEROFAHEATTRANSFERCANBEEASILYCONTROLLEDTHROUGHCURRENT22INTOUNITTRANSFERALLOSYSTEMMODULESPERATUREHEATCONSTANTTRICWITHTEMCHANNELSCONTROLLABLEMOULDFIG1MOULDTEMPERATUREVARIATIONACROSSONECYCLE2THEMAINAIMOFACOOLINGPROCESSISTOLOWERADDITIONALTIMEWHICHISTHEORETICALLYNEEDLESS;INPRAXIS,ITEXTENDS45UPTO67OFTHEWHOLECYCLETIME1,4FROMLITERATUREANDEXPERIMENTS1,4,ITCANBESEEN,THATTHETEMPERATUREHASENORMOUSINFLUENCEONTHEEJECTIONTIMETHEREFORETHECOOLINGTIMECOSTSINJECTIONMOULDINGPROCESSISACYCLICPROCESSWHEREMOULDVARIESASSHOWNINFIG1WHERETEMPERATUREVARIESAVERAGEVALUETHROUGHWHOLECYCLETIMECOOLINGTECHNOLOGYFORPLASTICINJECTIONMOULDSASITWASALREADYDESCRIBED,THEREAREALREADYSEVERALDIFFERTECHNOLOGIES,ENABLINGTHEUSERSTOCOOLTHEMOULDS5THECONVENTIONALISTHEMETHODWITHTHEDRILLINGTECHNOLOGY,PRODUCINGHOLESINTHEMOULDTHROUGHTHESEHOLESCOOLINGTHECOOLINGMEDIAISFLOWING,REMOVINGTHEGENERATEDANDHEATFROMTHEMOULD1,2ITISALSOVERYCONVENIENTBUILDINDIFFERENTMATERIALS,WITHDIFFERENTTHERMALCONDUCTIVWITHTHEAIMTOENHANCECONTROLOVERTEMPERATURECONDITIONSTHEMOULDSUCHAPPROACHESARESOCALLEDPASSIVEAPPROACHESWARDSTHEMOULDTEMPERATURECONTROLTHECHALLENGINGTASKISTOMAKEANACTIVESYSTEM,WHICHCANTHETHERMALCONDITIONS,REGARDINGTOTHEDESIREDASPECTS,EPRODUCTQUALITYORCYCLESTIMEONEOFSUCHAPPROACHESISGRATINGTHERMALELECTRICALMODULESTEM,WHICHCANALTERTHERMALCONDITIONSINTHEMOULD,REGARDINGTHEDESIREDPROPWITHSUCHAPPROACH,THEONEC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