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Cut away illustration of a double seam
A double seam is a canning process for sealing a tin can by mechanically interlocking the 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.[1] 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.
^"Complete History of the Can". Can Manufacturers Institute. Retrieved 10 October 2012.
A doubleseam is a canning process for sealing a tin can by mechanically interlocking the can body and a can end (or lid). Originally, the can end was...
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retorting is required for many food products Joining the wall and top "end". Doubleseam rims are crucial to the joining of the wall to a top or bottom surface...
using different colors. The American Cornhole League's rules call for double-seamed fabric bags measuring 6 by 6 inches (150 by 150 mm) and weighing 15...
Lancashire Coalfield, the coal seams of which were laid down in the Carboniferous Period. Some easily accessible seams were worked on a small scale from...
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"stacked-" or "double-box pleats". These stacked box pleats create more fullness and have a 5:1 ratio. They also create a bulkier seam. Inverted box pleats...
characteristics; coal seam continuity, thickness, structure, quality, and depth; strength of materials above and below the seam for roof and floor conditions;...
blend colors or geometry between two values, smoothly and without visible seams or discontinuities. Titration curves between strong acids and strong bases...
following series of steps: Start with the tie draped over the neck, with the seam inward and the wide end of the tie to the right. Cross the wide end over...
fabric or large reinforced sections. Double-weave jackets designed for competition usually display a prominent seam down the back of the jacket, joining...
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first rubber condom was produced in 1855. The earliest rubber condoms had a seam and were as thick as a bicycle inner tube. Besides this type, small rubber...
cutting line and the sewing line, where the distance between them is the seam allowance. Pattern notcher Wartenberg wheel Pouncing Willem. "Tracing Wheel"...
for turning corners right side out. "6" Sewing Gauge Has New Easy-read-seamDouble Point Slider". Bangor Daily News. Google Books. Sep 15, 1971. Retrieved...
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