Method of making pull-tabs for cans

Details Method of making pull-tabs for cans Method of making pull-tabs for cans

1991-01-30

1992-06-30

Coan, James F.

Package making

Methods

Forming a cover adjunct or application of a cover adjunct to...

531338, 72 42, B65B 6118, B21D 5128

Patent

active

051252120

ABSTRACT:
A method of making pull-tabs for the ends of cans of soda or the like in which a strip of aluminum having a top surface and a bottom surface is fed into a progressive die, a substantially non-volatile lubricant composition is deposited onto the top and bottom surfaces of the strip as it is being fed into the die so as to protect the die from excessive wear during subsequent stamping operations, pull-tabs are stamped out in a progressive fashion in the progressive die, and the amount of lubricant composition deposited is such that it is substantially completely used up so that the tabs are substantially free of lubricant composition when they leave the die, whereby the emission into the atmosphere of volatile organic contents is substantially reduced or eliminated, and unwanted transfer of lubricant from a pull-tab to a can end stacked above it is substantially reduced to avoid contaminating the can end. The preferred lubricant composition is about, by weight, 20 parts butyl stearate and 80 parts mineral oil.

REFERENCES:
patent: 3868919 (1975-03-01), Schrecker et al.
patent: 3884382 (1975-05-01), Ball
patent: 4106422 (1978-08-01), Buhrke
patent: 4848623 (1989-07-01), Saunders et al.
patent: 4950415 (1990-08-01), Malito
patent: 4978465 (1990-12-01), Sturwold

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