Method of forming containers
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United States of America Patent
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-
Dec 12, 1989
Grant Date -
N/A
app pub date -
Sep 26, 1983
filing date -
Feb 2, 1982
priority date (Note) -
Expired
status (Latency Note)
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Abstract
In a method of reshaping a container (1) having side wall (2) and a bottom wall (3), the container is rotated by support means (11, 12) while a roll (13) is applied thereto and moved towards the container axis. The bottom wall (3) comprises a central panel (4), an annular wall (5) depending from the periphery of the central panel, an outwardly convex bead (6) of arcuate cross-section on which the container stands and a transition wall (7) extending radially and axially from the convex bead to the side wall (2), and the roll is applied to the transition wall (7) to reshape it and to tighten the curvature of the convex bead. The method permits the formation of bottom wall profiles which resist eversion under the influence of pressure within the container so that thinner metals, such as tinplate or aluminum alloys, may be used.
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