compression why better? - sacmi · produced by ccm machines are colder than similar closures...
TRANSCRIPT
![Page 1: COMPRESSION WHY BETTER? - Sacmi · produced by CCM machines are colder than similar closures produced by injecOon machines. Colder the part, less is the shrinkage, narrower is the](https://reader034.vdocuments.net/reader034/viewer/2022050207/5f59f662ee05dc79d361ba65/html5/thumbnails/1.jpg)
COMPRESSION
WHYBETTER?
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COMPRESSION
WHYBETTER?INDEX
HOWITWORKSWHATISITSAVEENERGY
WEIGHTCONSISTENCYDIMENTIONALCONSISTENCY
ITRUNSFASTERENJOYSIMPLICITYMOREFLEXIBLE
PROCESSALWAYSUNDERCONTROLADVANTAGESINTHINWALLCAPS
REFERENCES
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COMPRESSION
WHYBETTER?HOWITWORKS
CompressionmoldingisaFULLMOLDINGPROCESSPolymerisfullymeltedintotheextruderandfullymixedandhomogenizedthankstoextruderscrewdesignandstaOcmixerplacedattheendoftheextrusionlineCompressionmoldingisaHIGHPRESSUREFORMINGPROCESS(similartoinjecOonmolding)Fora28mmcap,theavailableforceforeachmoldingstaOonisupto4000kg,appliedonasurfaceof7cm2.ThereforethepressureappliedoneachmoldingstaOonexceeds400kg/cm2
Moltenpolymerisstronglypressedagainstmoldsurface
WHATISIT
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COMPRESSION
WHYBETTER?SAVEENERGY
Compression
Injec@on+16%
CompressionmoldingDOESNOTOVERHEATPOLYMERSInINJECTION,duetotheextremelynarrowpassages,meltedplasOcmustbeoverheatedtoreachtherequiredfluidity
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COMPRESSION
WHYBETTER?SAVEENERGY
LOWEREXTRUSIONTEMPERATUREmeanslessenergyisneededtobringtheplasOctoextrusiontemperature,andsincetheplasOciscolder,itisusedLESSENERGYtocoolit
EnergyconsumpOondependsoncaptype/weight,butCompressionkeepsitsadvantageinenergyconsumpOonalsowhencapsweightdecreases
HOT RUNNER
RESIDENCE
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COMPRESSION
WHYBETTER?SAVEENERGY
Ininjec@onWATERCOOLINGTEMPERATUREhastobearound10°,incompressionSACMIclientsareusingitataround30°,whichmeansenergysaving
0,00
0,02
0,04
0,06
0,08
0,10
0,12
0,14
0,16
0,18
SACMI CCM48 cool+ tools - S29W15 INJECTION 450 Tons 96 cav - S29W15
AbsorbedPowerCosts(kwh/1000caps)
water cooling power
direct power
morethan30%savingsinCM
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COMPRESSION
WHYBETTER?outsandingWEIGHTCONSISTENCY
incompressionallmouldsreceivePLASTICwhichTRAVELTHESAMEPATH,therearenohotrunners,justanozzle.IncompressionALLMOULDSARETHESAME,thereisnothinglikeperiphery,central,upperorlowermoulds
injec@on compression
MeasurementsfromSacmiatcustomer’sproduc@onplantresultscomingfrom1280individualmeasurements
CompressionInjec@on
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COMPRESSION
WHYBETTER?outsandingDIMENTIONCONSISTENCY
LESSDIMENSIONALVARIATIONincompressionduetolowertemperature.ClosuresproducedbyCCMmachinesarecolderthansimilarclosuresproducedbyinjecOonmachines.Colderthepart,lessistheshrinkage,narroweristhedimensionalvaria@on.
MeasurementsfromSacmiatcustomer’sproducOonplantresultscomingfrom1280individualmeasurements
CompressionInjec@on
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COMPRESSION
WHYBETTER?
HIGHERWEIGHTCONSISTENCYHIGHERDIMENSIONALSTABILITY
LESSSTRESSCRACKING
Higherefficiencyintheboelingline
HIGHEREFFICIENCYintheBOTTLINGLINE
“Nowyougottounderstandwhywepurchasesomanycompressionmoldedclosures!”Mr.JoeLadina-CocaColaCompany
“Idonotknowifthesecapsarecheaperornot,becausetheyaregiventomeandIgottousethem.ButIknowthatwithsuchcapsthebo>linglineneverstops!”Mr.Longo–formerplantmanager-SanBenedeeo
“ZEROcomplaintsfromtheplantsinoneyear.Notone,twoorfivebutzero.Notasingledefectoncaps”Mr.Juelg–Vitaquaplantmanager
“WeexportthisclosuretootherplantsofthegroupandthefeedbackhasbeenveryposiHveforus.Theclosurehasspectacularperformancesonthecappingprocesswitha98%ofefficiency”Eng.JulioBertran–Ananosgroupdirector
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COMPRESSION
WHYBETTER?ITRUNSFASTER…..
TheLOWEREXTRUSIONTEMPERATUREallowsthecaptobecooledinthemouldmorequickly.SHORTERCYCLETIMEmeansHIGHERPRODUCTIVITY(equalnumberofmouldcaviOes)
Compression2000caps/minina48cavitymachine
Injec@on
29mmFLATWATERCAP
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COMPRESSION
WHYBETTER?ITRUNSFASTER…….
AddiOonally,incompressionthemaxcycleOmewithopenmouldsis32%oftotalcycleOme,ininjec@onis45%.
Compression
Injec@on Givensamecap,compressionhasshortercycleOmecomparedtoinjec@on,buthighercooling@me
cycle@mebreakdown(29mmwatercap)
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COMPRESSION
WHYBETTER?
ThecompeOOveadvantageofcompressionhasbeenfurtherpushedupbyCOOL+,amodifiedcoolantliquidcirculaOonsysteminsidethemouldwhichensuresallpartsincontactwiththeplasOcarecooled(bothinnerandouterpunch).ItCOOLSBETTERandINLESSTIME.
Coolingcircuitforstandardmould
addiOonalcircuitforcool+mould
ITRUNSFASTER….WITHBETTERQUALITY
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COMPRESSION
WHYBETTER?
INJECTIONItisCOMPLICATED,asina128cavitymouldthereare128heatersatthenozzleandatleast32heatersinthemanifold,wherecouldbepresenceofBURNTPLASTICandBURNTGREASE
COMPRESSIONNohotrunner,nomanifoldmeans:LESSRESIDENCETIMELESSCOLORCHANGETIMENODOWNTIMEFORCLEANING
ENJOYSIMPLICITY
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COMPRESSION
WHYBETTER?
Nohotrunner,nomanifold
Nomoldingforcewasted
Moreviscous(lowerMFI)HDPEcanbeused
Lessstresscracking
0
100
200
300
0 5 10 15 20
ESCR(hoursbeforebraking)
MOREFLEXIBLE
MELTINDEX
WIDERRANGEOFRAWMATERIALSALLOWED
CompressionRangeofmeltindex
Injec@onRangeofmeltindex
29mmwatercapexample
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COMPRESSION
WHYBETTER?
Nohotrunner,nomanifold
Nomoldingforcewasted
Moreviscous(lowerMFI)HDPEcanbeused
Lessstresscracking
0
100
200
300
0 5 10 15 20
ESCR(hoursbeforebraking)
MOREFLEXIBLE
MELTINDEX
WIDERRANGEOFRAWMATERIALSALLOWED
CompressionRangeofmeltindex
Injec@onRangeofmeltindex
28mmCSDcapexample
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COMPRESSION
WHYBETTER?MOREFLEXIBLE
IncompressionitispossibletohaveDIFFERENTCLOSUREDESIGNSWHITHOUTCHANGINGTHEMOULD,becausethecaptoppanelthicknesscanbehandledviauserinterface
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COMPRESSION
WHYBETTER?MOREFLEXIBLE
IncompressionALLMOULDCAVITIESareALWAYSINPRODUCTION,becauseinfewminutesitispossibletochangeupperandlowerpartofthemalfunOoningone,aslongasallofthemareindipendent
QUICKERCOLORCHANGE(usingliquidmasterbatch)becauseincompressiontherearenohotrunnersneithermanifolds
Injec@oncaviOesnotinproducOon
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COMPRESSION
WHYBETTER?PROCESSALWAYSUNDERCONTROL
aslongasincompressioncapshaveanorientedpathintheoutlet,itispossibletochecktheminrealOmewithaFULLYINTEGRATEDVISIONSYSTEMandREJECTIMMEDIATELYFAULTYCAPS,withposiOveimpactdownstreamintheprocess.
Injec@onSystemforcapsinspecOon
CompressionSystemforcapsinspecOon
$$$
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COMPRESSION
WHYBETTER?
Compressionmoldinghasaflowlengthinherentlyshorter,asthemoldisopenandthetopwallofthecapmustnotbeconsideredforflowpath.Compressionmouldinghasnorunners,sonopressureiswastedthere.Injec@onmouldingofthinwallcapsrequiresspecialequipment,notthesameistrueforcompressionmouldingOurcompeOtorsclaimthatcompressionmoldingisnotsuitableformoldingthinwallcaps,becauseoflargethicknessvariaOoninherentlylinkedtoourtechnology.InparOculartheysaidthatthemoltenplasOcplacementisnotalwaysinthemiddleofthecavity(becauseofcentrifugalforce).BUTsincefewyears,themoltenplasOcissuccessfullyinsertedinthecenterofthecavity,byaroddirectly.
THINWALLCAPSproducOon
CompressionthicknessvariaOon
0,03 mm
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COMPRESSION
WHYBETTER?
Averyprecisealignment,isforsuremoreimportantforthinwallcaps.IntheInjec@onMoldingprocess,temperaturedifferences(higherthan5°C)betweenplatesmakingupamoldassembly,canbeasourceofalignmentproblems,duetodifferentthermalexpansion.Besides,thelargeristheIMmold,themoreseverecanbethisproblem.InCMthereisnoeffectofmachinesize(numberofcavity).InCompressionMolding,therearenomoldplatesbutjustindividualandidenOcalcoresandcaviOes.SinceCMhasnohothalfandcoldhalf,theeffectofheatexpansionisintrinsicallylowerthanIM.InCM,moldhalvesarealignedbyaveryeffecOvewayofcentering.Eachindividualcoreandcavitypairisalignedthrutaperedsurfaces,combinedwithafloaOngstripperring,whichensureandearlycontactbetweencoreandcavitycenteringprovisions.AnIMmoldcanweighthousandsofkilogramsandistypicallyarrangedhorizontally,thereforeinthecentersecOon,itmightbesubjecttohorizontaldeflecOonunderitsownweight.ThisdeflecOoncanbadlyaffectthealignmentofthetwooldhalves.ThelargeristheIMmold,themoreseverecanbethisproblem.ThisissueisintrinsicallyabsentinCM.CMmoldsarearrangedverOcallyandweighjustfewkilograms.InCMthereisnoeffectofmachinesize.
THINWALLCAPSproducOon
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COMPRESSION
WHYBETTER?
Over1600presssesinstalledworldwide.
Withinflat-topbeverageclosuresproducedworldwide,morethan50%bySACMI’Stechnology
REFERENCES–thelargestcommunityofflattopbeveragecapsmanufacturers