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1、AppliedThermalEngineering27(2007)611–618www.elsevier.com/locate/apthermengThermalmodelingofvacuumwebcoatinga,*abbG.Comini,S.Savino,N.Magriotis,S.MuratoriaUniversityofUdine,DepartmentofEnergyandFluidMachinery,ViadelleScienze208,33100Udine,ItalybArcotronicsTechnologiesSrl
2、,ViaS.Lorenzo19,40037SassoMarconi(BO),ItalyReceived3February2006;accepted26May2006Availableonline12July2006AbstractThepaperpresentsananalyticalmodelforthepredictionofthesubstratetemperatureinvacuumwebcoaters.Themodelisbasedonthetheoryofheattransferbetweenacontinuouslymo
3、vingworkpieceandastationarysource,orsink,ofenergy.Theinvestigationcon-cernsthePhysicalVaporDeposition(PVD)ofametallayeronapolymerfilmbymeansofthermalevaporation,butmanyaspectsapplyequallywelltosputteringandelectronbeamevaporation.Thecontributionstothespecificheatloadonthe
4、webarequantified,andtheinfluenceoftheheatexchangebetweenthefilmandthecoolingdrumisdiscussedindetail.Aftersatisfactorilycomparingthepredictionswithavailableliteratureresults,themodelisusedasaguidelineforaseriesofexperimentaltestsaimedatdeterminingtheinfluenceoftheoperatingco
5、nditionsonthefinalqualityoftheproductsobtainedfromvacuumdepositionofthickmetallayersonthinpolymersub-strates.Theexperimentalresultsdemonstratetheinfluenceofthemechanicaltractionofthewebonthethermalconductancebetweenthefilmandthecoolingdrum.Ó2006ElsevierLtd.Allrightsreserve
6、d.Keywords:Vacuumcoating;Webcoating;Thermalmodeling;Thermalevaporation;Movingworkpieces;Webtension1.Introduction•electriccapacitors,•gas,lightandUVbarriersforflexiblefoodpackagings,Polymerwebs.i.e.thinpolymersubstrateswithconsid-•thermalradiationscreensforbuildingenvelop
7、es,erableflexibility,whencoatedwithmetallayersoffercon-•reflectivecoatingsandsumersthecombinedadvantagesofmetalandplastic•decorativewrappings.films.Thelistofsubstratesincludes,butisnotlimitedto:PE(polyethilene),PET(polyethyleneterephtalate),PPPhysicalVaporDeposition(PVD)ist
8、hemostreliable(polypropylene),CPP(castpolypropylene),BOPP(biaxi-technologyforthedepositionofmetalcoatingsonthi
