Method of manufacturing a wall ironed can
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United States of America Patent
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-
Jan 26, 1993
Grant Date -
N/A
app pub date -
Jul 22, 1991
filing date -
Jul 28, 1990
priority date (Note) -
Expired
status (Latency Note)
Importance
Abstract
In a method of drawing and wall ironing a can body, a blank (1) is cut from a laminate of aluminium or alloy and a polyester film. The blank is lubricated and drawn to a cup (7) having a side wall (8), which is then wall ironed. A terminal margin (14) of the side wall (13) of the wall ironed can is heated to a temperature above 100.degree. C. but below the crystalline melting point of the polyester film in order to prevent delamination of the polyester film from the side wall of the can during subsequent washing of the can. A benefit of the process is that the heating of the side wall margin (14) does not soften the aluminium or aluminium alloy body.
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