Methods of making can ends with plastics closures

Details Methods of making can ends with plastics closures Methods of making can ends with plastics closures

1988-02-25

1989-03-21

Schmidt, Frederick R.

Sheet metal container making

Method

Forming or treating metallic closure

220270, 413 25, B21D 5144

Patent

active

048138371

ABSTRACT:
A method of making a metal can end with a tear-open plastics closure, for a can intended to be resistant to leakage when subject to internal pressures, such as arise from carbonation of a beverage or thermal processing, wherein the undersurface of the can end is provided with a plastics coating, and the can end is pierced to form an aperture with a peripheral downturned flange at an angle of 80.degree. to 120.degree. to the plane of the can end and having a flat end. A one-piece ring pull closure is injection moulded on to the can end from a plastics material resistant to softening at up to at least 67.degree. C., without additional heating of the metal, so as to fill the aperture, bond with the coating, and enclose the flange, with a residual thickness below the flange of 0.08 to 0.5 mm. The thickness of the plastics material of the closuure is such that it can be sheared against the flange when the ring pull is pulled manually. The residual thickness of the plastics material may be varied around the aperture to increase resistance of the closure to creep, and the aperture may be pear-shaped or may be circular with a separate vent hole.

REFERENCES:
patent: 4170314 (1979-10-01), Weierman et al.
patent: 4489018 (1984-12-01), Ball
patent: 4576306 (1986-03-01), Kelsey et al.
Elements of Materials Science and Engineering, Author: Van Vlack, 1980, pp. 534-535.

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