Can manufacture
View Patent ↗An assembly for can manufacture includes a toolpack having coolant dies ( 3,4,5,6 ) adjacent and either side of ironing dies ( 1,2 ) so that coolant may be circulated around cavities in the coolant dies so as to cool the ironing die inserts ( 12 ). Generally, the toolpack is used in conjunction with a ram ( 20 ), coolant tube assembly ( 30 ) and ram guidance assembly ( 60 ) which together ensure that the ram is cooled along its entire length, up to and including the punch nose ( 21 ).
1. A metal container comprising a base, an axially opposite open ended side wall and a ring component, the ring component adapted to be closed by a peelable membrane or foil, the base and the ring component being formed from the same sheet of metal and fastened to opposite ends of the axially opposite open ended side wall,
in which the container side wall:
a) is flared outwardly to a diameter D 2 at the end to which the ring component is fixed by between 6 mm and X mm, where X=0.15 times the diameter D 1 of a central section of the container side wall, the central section being of a substantially constant cross-section;
and in which the container side wall:
b) is tapered inwardly to a diameter D 3 at the end to which the base is fixed by between 2 mm and Y mm, where Y=0.22 times the diameter D 1 of the central section of the container side wall.
2. The metal container as defined in claim 1 wherein the difference between diameter D 2 and diameter D 1 is from 6 mm to 12 mm and the difference between diameter D 3 and D 2 is from 14 mm to 28 mm.
3. The metal container as defined in claim 2 wherein the difference D 2 −D 1 is between 10 mm and 11 mm and the difference D 2 −D 3 is between 23 mm and 27 mm.
4. The metal container as defined in claim 1 wherein the ring component includes a generally flat panel to which a peelable membrane or foil is fixed, and the flat panel having a seal width of 2 mm to 6 mm.
5. The metal container as defined in claim 2 wherein an internal diameter of the ring component is substantially the same as or greater than the diameter D 1 .
6. The metal container as defined in claim 5 wherein the diameter D 3 is at least 15 mm smaller than the diameter D 1 .
7. A method of forming a container according to claim 1 , comprising:
forming a cylindrical side wall;
expanding the side wall at one end and necking the side wall at the opposite end;
forming an intermediate component having a seaming panel connected by a wall to a flat annulus, a substantially cylindrical wall portion and a centre panel;
cutting the centre panel out of the intermediate component and curling the cylindrical wall to form a ring component; and
seaming the ring component to the expanded end of the side wall and the centre panel to the necked end.
8. The method according to claim 7 , in which the step of forming the intermediate component comprises forming can end features on the centre panel.