Closure having a pull tab and a controlled seal width at the pull tab
AssigneeContinental Can Company, Inc.
InventorDonald J. Roth
Life of this patent
Estimating the term…
Abstract
This disclosure relates to a closure having a plastic layer which is to be heat bonded to a plastic outer layer of a container. The closure is provided with a pull tab to facilitate the removal thereof from the container. Heat bonding of the closure to the container is effected by induction heating utilizing a metal foil barrier layer within the closure. By offsetting a portion of the closure in alignment with the pull tab, the bond between the closure and the container may be configurated so as to facilitate the initial peeling of the closure from the container when the pull tab is lifted.
Claims7
A closure, said closure being of the type constructed to have a rupturable bonded seal with a container and including a projecting pull tab for effecting removal of said closure, said pull tab having a radial axis, said closure being circular in outline at least at said pull tab, and said closure in alignment with said pull tab and radially inwardly of said pull tab being upwardly offset to change a configuration of a bonding surface of said closure from circular to angular to reduce an effective width of said bonding surface transversely of said pull tab axis and thus a peeling force required to remove said closure.
Dependencies are inferred from the claim text.