Can

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, a cylindrical can shell of the can consisting mainly of paper or cardboard material, wherein the can shell has a barrier layer on an 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 an innermost layer of the can shell consists of a straight-wound barrier layer, which has a longitudinal seam with itself running in a longitudinal direction of the can, the longitudinal seam forming an increase in thickness in the layer structure and an inner longitudinal edge or an 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;
• wherein the barrier layer is followed by said two wound middle layers of the can shell;
• wherein both middle layers of the can shell each overlap themselves and are present in an area of overlap with themselves without a reduction in thickness, the inner longitudinal edge of the respective middle layer is facing a flank of the increase in thickness;
• wherein a third subsequent layer is located around said two wound middle layers;
• and
• wherein the third subsequent layer is a third wound middle layer or said barrier layer on the outside.

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 a longitudinal direction, wherein the longitudinal seam of the barrier layer running in the longitudinal direction of the can has an increase in thickness, wherein the barrier layer is followed by two subsequent layers of the can shell, in a form of wound layers of paper or cardboard material, wherein both subsequent layers of the can shell each overlap themselves and are present in an area of overlap with themselves without a reduction in thickness, the inner longitudinal edge of the respective layer facing a flank of the increase in thickness, wherein a third subsequent layer is located around the second subsequent layer, 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 a 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.