First Operation Seam Process
The first operation seaming roller curls the lid under the can body flange to form a hook.
The seam should be rounded at the bottom and in contact with the body of the can.
Second Operation Seam Process
The second operation seaming roller will push forward to flatten the hook formed by first operation roller, the pressing also will cause the compound to compress and fill up the gaps in the seam that not occupied by metal.
