Method and device for the production of a can body, and can body

Method for the production of a can body with a closed can shell having a longitudinal welding seam extending over the entire height of the can shell and with at least one closure member arranged on the can shell, comprising:

• cutting a metal strip into sections,
• forming the sections into a closed flat pressed shape by means of a forming mold and forming tools
• putting the flat pressed sections in series, joining directly each other
• laser welding a longitudinal seam in between lateral edges of the joining, flat pressed sections substantially continuously in longitudinal direction along the joining, flat pressed sections,
• severing tube sections, which have the length of a desired can height;
• forming the sections to can shells with a cross-sectional restriction at least at one face of the can shells;
• and
• attaching a closure member in the form of a can bottom to said at least one restriction of each can shell by laser welding a circumferential seam, wherein the outer marginal region of the can bottom is adapted to the shape of said restriction.

Device for the production of a can body with a closed can shell and at least one closure member arranged on the can shell, comprising:

• a supply arrangement for supplying a metal strip;
• first forming device for forming the metal strip into the shape of a tube closed in peripheral direction;
• a welding device for substantially continuously welding the tube;
• a severing device separating closed can shells from the tube;
• a second forming device for forming the sections to can shells with a cross-sectional restriction at least at one face of the can shells;
• and
• an attaching device for attaching a closure member in the form of a can bottom to said at least one restriction of each can shell by laser welding a circumferential seam, wherein the outer marginal region of the can bottom is adapted to the shape of said restriction.

Can body including a can shell, closed by way of a longitudinal laser welding seam, and a bottom fixed at one face side of the can shell, wherein

• the can shell consists of metal strip closed in peripheral direction by the longitudinal laser welding seam;
• the can shell has a cross-sectional restriction at least at one face of the can shell;
• and
• a closure member in the form of a can bottom is attached to said at least one restriction of each can shell by a circumferential laser welding seam, wherein the outer marginal region of the can bottom is adapted to the shape of said restriction.

Can body comprising a closed can shell and a closure member fixed at one face side of the can shell wherein

• the can shell has a cross-sectional restriction at least at one face of the can shell;
• the closure member is attached to said at least one restriction of the can shell by a circumferential laser welding seam, wherein the outer marginal region of the closure member is adapted to the shape of said restriction;
• and
• the closure member including a valve seat with a metallic inner portion as well as a plastic portion (which surrounds torically the metallic inner portion at least at the valve seat.

Can body comprising a closed can shell and an upper closure member fixed at one face side of the can shell wherein

• the upper closure member is including a valve;
• the can shell has a cross-sectional restriction at least at one face of the can shell;
• and
• the closure member with the valve is attached to said at least one restriction of the can shell by a circumferential laser welding seam, wherein the outer marginal region of the closure member is adapted to the shape of said restriction.