Abstract: A method and apparatus for triple roll seaming flanged end closure to a flanged container body. Before the flanges of the end closure and container body are rolled together by a suitably shaped seaming roll, the peripheral portion of the end closure flange is imparted with a frustoconical portion at an angle between about 20.degree. and 50.degree. with respect to the yet undeformed part of the end closure flange followed by a first rolled section which curves substantially around, parallel to the frustoconical zone. The raising of the frustoconical portion and the forming of the first rolled section may be effected substantially simultaneously, either before or after the end closure is positioned in the open end of the container body, in a first tool setup including a single forming roll with parallel entry and exit zone joined through a frustoconical zone connected to a radiused zone.

Abstract: A process for securing bases in the ends of metallic container bodies by .[.upsetting.]. .Iadd.rolling by a seaming roll .Iaddend.contiguous peripheral portions of the bases and container ends, in which overlapping bent-over peripheral base and container end portions are .[.knurled to roll them over.]. .Iadd.rolled together by a seaming roll .Iaddend.to produce a joint having seven superposed thicknesses of the base and the container body. .[.At the end of.]. .Iadd.During .Iaddend.the roll-over movement, a .[.polymerized.]. .Iadd.polymerizable .Iaddend.liquid is injected between at least some of the thicknesses of the metal of the base and container body.