包装盒专业英语5.ppt

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