Can

A can, configured to contain at least one of a solid, liquid, and a gaseous medium which can have positive pressure or can develop such during transport or storage, the cylindrical can shell of the can consisting mainly of paper or cardboard material, the cylindrical can shell comprising:

• at least two wound layers and being closed at the bottom with a bottom element and at the top with a cover element;
• wherein the innermost layer of the can shell consists of a straight-wound barrier layer which has a longitudinal seam with itself running in the longitudinal direction of the can;
• wherein one of:
• the longitudinal seam is sealed on the inside by a film layer of the barrier layer, which overlaps the barrier layer in an area of the longitudinal seam;
• the longitudinal seam is sealed by a sealing strip running straight in the longitudinal direction of the can;
• and
• the longitudinal seam is designed as a folded seam and the inner or outer longitudinal edge of a further layer of the can shell in the form of a wound layer made of paper or cardboard material faces a flank of the increase in thickness resulting from the folded seam.

A can, containing at least one of a solid, liquid, and a gaseous medium which can have excess pressure or can develop such during transport or storage, the cylindrical can shell of the can consisting mainly of paper or cardboard material, wherein the can shell has a barrier layer on the inside and a barrier layer on the outside, the can comprising:

• at least two wound middle layers made of paper or cardboard material in between;
• a bottom element closing the can at the bottom;
• and
• a cover element closing the can at the top;
• wherein the innermost layer of the can shell consists of a straight-wound barrier layer, which has a longitudinal seam with itself running in the longitudinal direction of the can, the longitudinal seam forming an increase in thickness in the layer structure and the inner or outer longitudinal edge of at least one of the middle layers is facing a flank of the increase in thickness resulting from the longitudinal seam.

A method for producing a can, comprising:

• manufacturing, in a first step, can shells with a continuously operating winding machine in that the individual layers are applied on a winding mandrel and are continuously connected to one another, wherein during winding the barrier layer is provided with a longitudinal seam running in the longitudinal direction and wherein subsequently the resulting tube is cut into individual cylindrical hollow bodies open on both sides;
• bending outwards, in a second step, the two open ends of the cylindrical hollow body so that the ends have a circular cross section with a larger diameter than the remaining cylindrical hollow body;
• closing, in a third step, the lower end of the cylindrical hollow body with a flanging device with a bottom element;
• filling, in a fourth step, the hollow body closed at the bottom with the medium using a filling device;
• and
• further closing, in a fifth step, the filled hollow body at the bottom at the top with a cover element using a crimping device;
• wherein the fourth and fifth steps are performed on a filling system configured to fill and close known aluminum cans.