Appartus for, and method of, producing a bag from paper, and paper bag

A bag machine for production of bags made of paper material, comprising:

• an unwinding device to unwind and feed the paper material in a transport direction (x);
• a device for producing a perforation, such that portions of the perforation are offset relative to each other in the transport direction (x), so that a first wall of a finished bag continues in at least one tab, which extends beyond a second wall thereof;
• a tube formation device to form a tube, with which the side areas of the sheet are folded and joined to each other to form an overlapping area;
• a separation device to separate a tube section along the perforation from the tube;
• a bottom formation device, with which areas of a leading end of the tube section are folded and fastened to an outer wall of the tube section;
• and
• a device for applying to the paper material, directly adjacent to the perforation, an adhesive surface, the adhesive surface being (i) applied to an area of the paper material that represents a side of the tab facing the second wall in the finished bag and (ii) a piece of material having adhesive on bot sides thereof, one side of which is covered with a cover sheet,
• the device for applying the adhesive surface being located upstream, in the transport direction (x), of the tube formation device.