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- Double_seam abstract "A double seam is the closure between a can body and a can end (or lid).Originally, the can end was soldered or welded onto the can body after the can was filled. However, this introduced a variety of issues, such as foreign contaminants (including lead and other harmful heavy metals). The double seam was later developed as a cheaper and safer alternative and quickly replaced the welded seam.The double seam is made using a double seamer, which can have just one or a number of heads or seaming stations. The double seam is formed by mechanically interlocking five layers of material together: three layers of the can end and two layers of the can body. Each seaming head typically consists of two rolls, a first operation roll and second operation roll, and a chuck. Some seaming machines have two first operation rolls and two second operation rolls and a few machines use a method called \"rail seaming\" which requires no rolls. During the seaming operation, the can end is lowered on to the filled can body and held down by the chuck, which acts as an anvil to the seaming operation. The first operation roll then engages the can end against the can body thereby folding the end curl around the flange of the body. In some seaming machines, this is done as the can is turning at high speed. In other seaming machines, the can is stationary and the first operation roll (or rolls) spins around several times to ensure a complete first operation. After the first operation is complete, the first operation roll disengages from the can and the second operation roll then engages the can. The purpose of the second operation is to iron out the double seam into its final shape and remove the voids between the layers of can and end material. In practice, ironing out all of the can and end material in a double seam without leaving some voids is impossible without the use of a sealing compound.".
- Double_seam wikiPageExternalLink Cover%20Droop.pdf.
- Double_seam wikiPageExternalLink Cover%20Vee.pdf.
- Double_seam wikiPageExternalLink Cut-Over.pdf.
- Double_seam wikiPageExternalLink Dead%20Head.pdf.
- Double_seam wikiPageExternalLink FalseSeam.pdf.
- Double_seam wikiPageExternalLink Knoccked%20Down%20Flange.pdf.
- Double_seam wikiPageExternalLink Long%20Body%20Hook.pdf.
- Double_seam wikiPageExternalLink Long%20Cover%20Hook.pdf.
- Double_seam wikiPageExternalLink Loose%20First%20Operation%20Seam.pdf.
- Double_seam wikiPageExternalLink Pleats,%20Puckers%20and%20Spurs.pdf.
- Double_seam wikiPageExternalLink Seam%20Bump.pdf.
- Double_seam wikiPageExternalLink Sharp%20Seam.pdf.
- Double_seam wikiPageExternalLink Short%20Body%20Hook.pdf.
- Double_seam wikiPageExternalLink Short%20Cover%20Hook.pdf.
- Double_seam wikiPageExternalLink Sprung%20Seam.pdf.
- Double_seam wikiPageExternalLink Tight%20First%20Operation%20Seam.pdf.
- Double_seam wikiPageExternalLink iseamproblems.htm.
- Double_seam wikiPageExternalLink watch?v=e61omDYJdeU&feature=youtu.be&t=23m49s.
- Double_seam wikiPageID "37171441".
- Double_seam wikiPageLength "18843".
- Double_seam wikiPageOutDegree "6".
- Double_seam wikiPageRevisionID "667814523".
- Double_seam wikiPageWikiLink Canning.
- Double_seam wikiPageWikiLink Category:Canned_food.
- Double_seam wikiPageWikiLink Category:Containers.
- Double_seam wikiPageWikiLink Double_seamer.
- Double_seam wikiPageWikiLink Food_and_Drug_Administration.
- Double_seam wikiPageWikiLink United_States_Department_of_Agriculture.
- Double_seam wikiPageWikiLinkText "Double seam".
- Double_seam wikiPageWikiLinkText "double seam".
- Double_seam wikiPageUsesTemplate Template:Multiple_issues.
- Double_seam wikiPageUsesTemplate Template:Packaging.
- Double_seam wikiPageUsesTemplate Template:Refimprove.
- Double_seam wikiPageUsesTemplate Template:Reflist.
- Double_seam wikiPageUsesTemplate Template:Underlinked.
- Double_seam subject Category:Canned_food.
- Double_seam subject Category:Containers.
- Double_seam hypernym Closure.
- Double_seam comment "A double seam is the closure between a can body and a can end (or lid).Originally, the can end was soldered or welded onto the can body after the can was filled. However, this introduced a variety of issues, such as foreign contaminants (including lead and other harmful heavy metals).".
- Double_seam label "Double seam".
- Double_seam sameAs Q5300087.
- Double_seam sameAs m.0n50w1m.
- Double_seam sameAs Q5300087.
- Double_seam wasDerivedFrom Double_seam?oldid=667814523.
- Double_seam isPrimaryTopicOf Double_seam.