Container end closure system

Claim 1

A molded end closure of organic polymeric material for a tubular container formed from identable material, comprising a central section, an integrally formed peripheral rim extending about a closure axis, the rim being of generally U-shape cross-section and providing a bight and a pair of peripherally extending legs for straddling and snugly engaging a peripheral wall of a tubular container, the legs and bight cooperating to define an annular slot of narrow radial dimension for receiving end wall portions of a container tube having substantially the same said dimension, the legs and bight providing a continuous surface which is exposed inside the slot, and macroscopic surface irregularity means formed on said surface as discrete, spaced structures for projecting away from said surface toward and into firm indenting engagement with the container end wall portions when the wall portions are snugly received in the slot for enhancing the bonding action of a bonding agent introduced between the said continuous surface and the wall portions by initiating bonding in the vicinities of the discrete, spaced structures, the said legs between said discrete spaced structures defining circumferential zones forming capillary-like passages with said container end wall portions thereadjacent, whereby the bonding action spreads rapidly away from the vicinities of the discrete, spaced structures to effectively continuously bond and seal the said closure surface portions and the container end wall portions.