Importance

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Abstract

This relates to the construction of a pull tab integrally formed on a closure which is bonded to a container by way of a rupturable bond. Instead of utilizing the conventional pull tab which is normally integrally connected to the closure, the pull tab has been modified so as to provide two or more lines of bond rupturing forces as opposed to the prior art original single line with the two or more lines of bond rupturing forces having a tendency to spread in opposite directions and thereby greatly reducing the force required to initiate a rupture of the bond between the closure and the container. Numerous different types of notches, openings and the like are provided to provide for the separate lines of bond rupturing forces. These notches, openings and the like also function to constrain stray electric current induced into an intermediate metal layer of the closure and pull tab flowing into the pull tab, thereby reducing the power requirement for heating the closure to a bonding temperature. Employing selective geometries of the notches, openings and the like creates selective geometries of the bond to achieve ease of initiating rupture.

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First Claim