Curled container bodies, method of securing closures thereto and containers formed thereby

A method of securing a metal container end closure to the marginal open end portion of an open-ended composite cylindrical container body whose body wall includes a layer of full hard metal foil, whose marginal open end portion is less than about 0.002 inch thick, to form a hermetically sealed container capable of holding internal pressures of up to about 90 psi developed at elevated temperatures of up to about 140.degree. F., which comprises:

• providing an open-ended composite cylindrical container body whose body wall includes a layer of full hard metal foil and whose marginal open end portion is less than about 0.002 inch thick,
• forming an annular body curl of the marginal open end portion so that the curl has an edge which points toward the container body wall,
• providing a metal container end closure having merging panel portions including a central panel, an annular substantially vertical countersink wall portion peripheral to the central panel, and a peripheral flange, and
• hermetically securing the end closure to the curled marginal open end poriton of the body wall to form a container capable of holding internal pressures of up to about 90 psi developed at elevated temperatures of up to about 140.degree. F. by
• providing a sealant material between the end closure countersink wall portion and the container body wall,
• bending the closure flange into a skirt and closure hook having an edge,
• mechanically engaging and exerting a compressive force by an end portion of the closure hook substantially axially against an end portion of the body curl, and
• axially compressing the body curl with the end portion of the closure hook to hermetically pressure-resistantly secure the end closure to the container body.