Metal containers and methods of manufacture
AssigneeCrown Packaging Technology, Inc.
InventorPaul Robert Dunwoody
Life of this patent
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Abstract
A method of reducing a thickness and increasing a height of a cylindrical wall of a metal cup to form a can body comprises positioning a wall-ironing punch (40) inside the cup, moving an annular wall-ironing die (24) axially over the closed end of the cup towards the open end of the cup, but not beyond the open end of the cup, in order to iron the cylindrical wall from the closed end up to a position axially spaced from the open end and moving the wall-ironing die (24) back in an opposite direction to remove the can body from the die (24). Methods of altering a diameter of one or more regions of a can body are also disclosed.
Claims10
A method of reducing a thickness and increasing a height of a cylindrical wall of a metal cup so as to form a can body, the method comprising:
- positioning a wall-ironing punch inside the cup;
- moving an annular wall-ironing die axially over a closed end of the cup towards an open end of the cup, but not beyond the open end of the cup, in order to iron the cylindrical wall from the closed end up to a position axially spaced from the open end;
- forming a profile in a base of the cup at the closed end to form the can body, wherein said die is shaped such that when the profile is formed in the base of the cup the die passes across a region beyond said axially spaced position toward the open end without ironing that region;
- and
- moving the wall-ironing die back in an opposite direction to remove the can body from the die.
Dependencies are inferred from the claim text.