초록 ▼

An end wall for a can body has a central panel (7) surrounded by a conventional expansion ring (8) which is connected to an inner wall (16) of a channel portion by an upwardly extending deformable annulus (17, 18) so that during thermal processing of a closed can having this end wall, the deformable

An end wall for a can body has a central panel (7) surrounded by a conventional expansion ring (8) which is connected to an inner wall (16) of a channel portion by an upwardly extending deformable annulus (17, 18) so that during thermal processing of a closed can having this end wall, the deformable annulus changes shape to permanently increase the container volume. The deformable annulus protects the side wall and ends of the can from excessive pressure so thinner container materials may be used.

대표청구항 ▼

A container end wall (4) comprising a peripheral channel portion opening in an axially upward direction and being defined by an outer wall (15) an inner wall (16) and an annular bead therebetween; a center panel (7) spaced radially inboard of said inner wall (16), an inner peripheral wall (19) joine

A container end wall (4) comprising a peripheral channel portion opening in an axially upward direction and being defined by an outer wall (15) an inner wall (16) and an annular bead therebetween; a center panel (7) spaced radially inboard of said inner wall (16), an inner peripheral wall (19) joined to said center panel, a deformable bistable annulus (6) extending both radially and axially inward away from said inner wall (16) and being joined to said inner peripheral wall (19), and said deformable bistable annulus (6) being constructed and arranged to (a) occupy a first stable position under ambient pressure at which said centre panel (7) and said deformable bistable annulus (6) are undeflected, and (b) occupy a second bistable position under internal pressure above ambient pressure at which said centre panel (7) is temporarily deflected axially upward and said deformable bistable annulus (6) is permanently deflected from its first stable position to a second stable position which permanently increases the volume of the container.