Patent ID: 7556191

Claim:
A blank for forming a sealed enclosure useful for containment of a liquid comprising: a laminate including a substrate having first and second opposite surfaces and at least one other layer of disparate elongation to break property relative to said substrate, said elongation to break property of said at least one other layer being greater than the elongation to break property of said substrate, said laminate having a plurality of score lines, and being configured to be folded along said plurality of score lines to form a sealed enclosure; a structurally weakened area defined on a portion of said first surface of said at least one other layer of disparate elongation to break property comprising a plurality of intersecting embossments produced by a pair of registered male die inserts acting simultaneously on opposed surfaces of said laminate, each of said embossments being of a continuous length and non-pervious to liquids over their length, said structurally weakened area including a thickness that is substantially less than a thickness of said substrate and wherein said structurally weakened area is configured to be ruptured upon applying thereto a puncturing force originated externally of said container to permit access to an interior region of the sealed enclosure; and said structurally weakened area remains unfolded during formation of the blank into the sealed enclosure.