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US 4,813,561 AGranted
Composite retortable closure
AssigneeAnchor Hocking Corporation
InventorCharles S. Ochs
Life of this patent
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Abstract
A closure is described for sealing retortable containers. The closure has a disc shaped metal cover with a grooved sealing portion at its outer edge containing a sealant and a plastic ring for engaging the container. A clamping action holds sealant in the cover groove against a rim of the container and the relative dimensions of the closure groove and the container are chosen for providing a tight seal particularly after retorting.
Claims11
A sealed package comprising the combination of:
- a container 3;
- a composite closure 1 having a metal cover 2 and a molded plastic ring 4 sealing the container;
- a generally cylindrical annular sealing surface on the radially innermost surface of the container rim 17;
- the annular outer edge of said metal cover 2 having a downwardly facing groove 7;
- a grooved sealant 8 in said metal cover 2 groove 7;
- and
- means creating a pressure contact between said container rim 17 annular sealing surface and the radially innermost surface of said sealant 8 groove provided by said sealant 8 groove at its center line D having a greater diameter than the diameter C of said container rim 17 at its center line when the container 3 is at room temperature.
4 more elements
Dependencies are inferred from the claim text.