包装盒专业英语5.ppt
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包装盒专业英语5.ppt
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Lesson5MetalContainers第第5课课金属容器金属容器BackgroundSteelisoneoftheolderpackagingmaterials.-Originallyusedforround,square,andrectangularboxesandcanisters.-Theold-fashionedappearanceofafabricatedmetalboxiseffectivelyusedtocreatenostalgiaforspecialtyandgift-typecontainers.-Sanitaryfoodcan,hand-solderedcylindricalmetalcansstartedintheearlyl800s.-Metalcansadvantages:
Backgroundbeingrelativelyinexpensivecapableofbeingthermallyprocessedrigideasytoprocessonhigh-speedlinesreadilyrecyclabletotalbarriertogasandlightanimportantmeansofdeliveringashelf-stableproduct-Foodcans:
three-piececonstruction(Figure5.1).BackgroundFigure5.1Three-piece(left)andtwo-piece(right)canconstructionBackgroundShallowdrawncontainerswithfrictionorslipcovers-Two-pieceshallowdrawncanswithdouble-seamed(folded)ends-Two-piececans(Figure5.1).reducedmetalusageimprovedappearanceeliminationofapossibleleakagelocationmoreelaboratetoolingrequired-Deeperdrawsandmultipledrawsanddraw-and-ironprocess-Impact-extrusion:
tin,lead,andAl;collapsibletubes(nearlyAl);heaviergaugealuminumextrusionsusedforpressurizedaerosolcontainersCommonMetalContainerShapesThree-piecesteelsanitaryfoodcans.Aerosolcans,madebytwomethods:
(1)Three-piecesteelcanswithaweldedbodyandtwoends,and
(2)one-piece,impact-extrudedaluminumcansnecked-intoacceptthevalvecup.Steeloraluminumtwo-piecedrawn-and-ironedbeveragecans.Two-piecesteeloraluminumcansbydrawingorbydrawandredraw.Full-opening,ringpull-topcansDouble-seamed,conventional-topcansCanswithhingedlids,usuallysteelCommonMetalContainerShapesFlatroundcansofdrawnsteeloraluminumwithslipcovers(Figure5.2)Three-piecesteeloraluminumovals,typicallyfittedwithadispensingspout(Figure5.2)Traditionalpear-shaped,three-piecesteelhamcansOblongsteelthree-pieceF-stylecans(Figure5.2)Oblongkey-openingcans,three-piecesteelMultiplefrictioncansofthree-piecesteel,alsoreferredtoasdouble-andtriple-tightcansThree-piece,square-breastedsteelcansSpicecans(smallerthree-piececans)withaperforatedmetalorplastictopIndustrialpailsanddrumsTwo-piece,low-profilesteeloraluminumovals,withfull-openingringpull-topsCommonMetalContainerShapesFigure5.2ExamplesofspecializedcanshapesThree-PieceSteelCansSteelthree-piececanbodiescanbemechanicallyseamed,bondedwithadhesive,welded,orsoldered(Figure5.3).-Aluminumcannotbesolderedandcannotbeweldedeconomically.-Weldedsanitarythree-piececanbodiesarethereforemadeexclusivelyofsteel.-MechanicalseamingorclinchingisusedonlyforcontainersintendedfordryproductThree-PieceSteelCansFigure5.3Mechanical,welded,andadhesive-bondedsideseamsforthree-piececansThree-PieceSteelCansAdhesivebonding,orcementing,usesathermoplasticadhesiveextrudedontoahotcanblank.Beinganattractivebody-assemblymethodfornotbeingsubjectedtothermalprocessinghavingfullwraparoundlithographyi.e.,three-piecebeveragecontainers,somefrozenjuiceconcentrateandpaintcans-Solderedacan,(solders:
97.5%leadand2.5%tin).LeadextractionbyfoodproductsandapotentialproblemwithsolderedseamsBeingnolongerpermittedforfoodinNorthAmerica-Weldedcans,(strongandeliminatepotentialleadhazards).Three-PieceSteelCansProcess:
(Notes:
Soudronic-thegloballeaderforresistanceandlaserweldingsystemsandkeyproductionsystemsforthemetalpackagingindustry(3-piececans,industrialpackaging)bodysheet-atubewithaslightoverlap-passingbetweenelectrodes-anelectricalcurrentheatsandfusesthemetal(Figure5.4).Weldedseam:
about30%thickerthanthetwobasemetalsheets.-Sanitaryfoodcansandbead:
toimproveresistancetocollapse(preventingcollapseduringpressuredifferentialsencounteredduringretortingandenablesthecantowithstandaninternalvacuum).Three-PieceSteelCansFigure5.4Thecan-weldingprocessThree-PieceSteelCansSidewallbeading:
requiresmorematerialreducestop-to-bottomcompressionstrengthcomplicateslabeling-Canendsintendedforthermalprocessingandaseriesofcircularexpansionpanels(Figure5.5).Thisallowsformovementoftheendpanelssothatthecontentsareabletoexpandandcontractwithoutbulgingorotherwisedistortingthecan.-Can-endcompoundappliedaroundtheperimetercurlasacaulkorsealant(Figures5.6and5.7).Three-PieceSteelCansFigure5.5Typicalcan-endembossingpatternThree-PieceSteelCansFigure5.6Double-seamingistheattachmentofthecanendtothebody.Itinvolvestwocurlingsteps.Three-PieceSteelCansFigure5.7Thedoubleseamisacriticalcancomponent.Everyangle,radius,anddimensionmustbecorrecttoensureahermeticsealTwo-PieceCansDrawDrawandredraw(DRD)Drawandiron(D&I)DrawProcess:
Shallow-profilecans(whoseheightislessthantheirdiameter)canbedrawndirect
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