Flexible package structure with a press-and-pull opening feature
View Patent ↗An opening feature for a flexible laminate membrane having a metal foil layer sandwiched between first and second structures is formed by a first score line through a thickness of the first structure but not breaching the metal foil layer, and a second score line through a thickness of the second structure but not breaching the metal foil layer, the first and second score lines together encompassing a removable panel portion of the flexible membrane. A press-and-pull tab constituting part of the removable panel portion is arranged to be pressed downward to cause the metal foil layer to break in the region of the tab, and then to be grasped and pulled upward to cause the metal foil layer to break all around a periphery of the removable panel portion to enable the removable panel portion to be completely removed from the flexible membrane.
1. A container at least part of which is formed by a flexible membrane having a press-and-pull opening feature, wherein:
the flexible membrane comprises a laminate of a metal foil layer having a first side and an opposite second side, a first non-metal structure adhered via a first adhesive layer to the first side of the metal foil layer, and a second non-metal structure adhered via a second adhesive layer to the second side of the metal foil layer; and
the press-and-pull opening feature comprises:
a first score line forming a complete loop and extending through a thickness of the first structure but not breaching the metal foil layer;
a second score line forming a complete loop and extending through a thickness of the second structure but not breaching the metal foil layer, the first and second score lines together encompassing a removable panel portion of the flexible membrane, wherein the flexible membrane includes an outlying portion that completely surrounds the removable panel portion; and
a press-and-pull tab constituting part of the removable panel portion, wherein a segment of the first score line and a corresponding segment of the second score line separate an outer edge of the press-and-pull tab from the outlying portion of the flexible membrane, and wherein the press-and-pull tab is arranged to first be pressed downward generally normal to the flexible membrane to cause the metal foil layer to break in the region of the outer edge of the press-and-pull tab so as to sever the outer edge of the press-and-pull tab from the outlying portion of the flexible membrane, and then to be grasped and pulled upward to cause the metal foil layer to break all around a periphery of the removable panel portion to enable the removable panel portion to be completely removed from the flexible membrane.
2. The container of claim 1 , wherein at least in the vicinity of the press-and-pull tab the second score line is offset from the first score line, and wherein the first adhesive layer is absent in a region bounded between the offset first and second score lines.
3. The container of claim 2 , wherein the first and second score lines are offset from one another all around the periphery of the removable panel portion.
4. The container of claim 1 , wherein the container comprises a can body having an upper rim, and the flexible membrane comprises a lid attached to the upper rim, wherein the first structure is exposed at an outer surface of the container and the second structure is adjacent an interior of the container, and the second structure at least in the outlying portion of the flexible membrane includes a heat-sealable material that is heat-sealed to the upper rim, wherein the outlying portion is the only part of the flexible membrane that is heat-sealed to the upper rim, and the outlying portion remains attached to the upper rim after the removable portion of the flexible membrane is removed.
5. The container of claim 4 , wherein the upper rim and the lid each has a plan view shape selected from the group consisting of round, non-round, and polygonal.
6. The container of claim 5 , wherein the removable portion of the flexible membrane has a plan view shape geometrically similar to that of the lid.
7. The container of claim 1 , wherein the container comprises a bag or pouch constructed of the flexible membrane.
8. The container of claim 7 , wherein the removable portion of the flexible membrane has a plan view shape selected from the group consisting of round, non-round, and polygonal.
9. The container of claim 1 , wherein the first structure comprises at least a first polymer film layer and the second structure comprises at least a second polymer film layer.
10. The container of claim 9 , wherein the second structure additionally comprises a third polymer film layer, wherein the second polymer film layer has one surface adhered to the second side of the metal foil layer, and the third polymer film layer is disposed adjacent an opposite surface of the second polymer film layer.
11. The container of claim 10 , wherein the third polymer film layer is a sealant material.
12. The container of claim 11 , wherein the sealant material is a heat-sealable material.