Method and apparatus for sealing canisters

摘要

A method and apparatus is described for forming a lock seam for joining a first edge of material to a second edge of material. The lock seam is characterized by the first edge being wrapped in a first curl such that the first curl is substantially circular in shape. The second edge is wrapped in a second curl which is also substantially circular in shape. The inside surface of the first curl is wrapped about the outer surface of the second curl. The lock seam formed by this manner is particularly advantageous for muffler assembly.