Device for welding plastic films by means of hot gas

A device having a modular design for welding of a plastic film by hot gas with at least one tubular body through which an electric current flows for heating of the hot gas, wherein the device comprises at least one gas inlet opening (6, 106) and a plurality of gas outlet openings (12, 112) arranged next to each other, from which hot gas is blown onto the plastic film, the at least one gas inlet opening (6, 106) being provided on a main tubular body (4, 104), which stands in gas communication with a plurality of branch tubular bodies (8, 108) at branching points (10, 110);

• wherein each of the plurality of branch tubular bodies (8, 108) has at least one of the plurality of gas outlet openings (12, 112);
• wherein all of the plurality of branch tubular bodies (8, 108) have electric current flowing through them;
• wherein the main tubular body (4, 104) is formed by a plurality of modules (124) connected to one another by at least one connection element (136) comprising at least one rod;
• wherein each of the plurality of modules (124) has:
• at least one of the plurality of branch tubular bodies (8, 108), through which electric current is flowing,
• at least one branching point (10, 110) through which gas flows from the main tubular body (4, 104), into the at least one of the plurality of branch tubular bodies (8, 108),
• a section (126) of the main tubular body (4, 104), at least one recess for receiving the at least one connection element (136) for establishing a connection with another of the plurality of modules.