Tear opening device for containers

In an opening device for a package, said package comprising a substantially rigid outer wall portion and an inner layer of substantially gas-tight material, the improvement wherein said outer wall portion includes a first tearing notch defining a removable portion and a second tearing notch defining a grip tongue, said outer wall portion and said inner layer being interconnected substantially over their total surfaces facing each other with said outer wall portion and said inner layer being separated within an area under at least a portion of said grip tongue, said outer wall portion including an injection molded cap and said inner layer including polypropylene laminated with a thin aluminum foil attached to said cap, said cap being attached to a middle part of said package, said middle part being in the form of an extruded casing which on the outside thereof includes a sealing outer layer, and said inner layer substantially extending to said sealing outer layer.