Patent ID: 6719514
Filing Date: 2004-04-13
Classification: B21D,B65D,F25D

Abstract:
A process for producing a metal can, comprising a cylindrical body, a base and a lid, in which the base has a cylindrical recess which projects into the inside of the can, in which processa) a combination of a body and a base is produced, by deep-drawing and wall stretching, from metallic and/or plastic coated metal sheet which is suitable for cans, wherein the body and the base are formed from a single structure; b) a tubular insert-piece, which forms the cylindrical recess and has opposed a first closed end and a second open end, is produced from corresponding metal sheet by deep-drawing or spinning, followed by wall stretching; c) a hole which is narrower than the open end of the insert piece is made in the base of the body-base combination; d) the edge of the hole is flanged until the edge of the hole acquires a bearing surface which is able to fit together with the edge of the open end of the insert piece; and e) the insert piece is inserted into the hole and the edge of the hole and the edge of the open end of the insert piece are joined together directly; wherein the edge of the hole is beaded before the insert piece is inserted into the hole and joined to the edge of the hole; wherein the closed end of the insert piece is inserted into the hole before any other portion of the insert piece is inserted into the hole.