Patent ID: 7731647

Claim:
A bottoming device for forming a cross bottom paper bag, the device configured to form the cross bottom of the paper bag by providing folds at extremities of a tubular segment from which the bag is produced such that lines of a glue are applied to at least one of a folded bottom on the extremities of the tubular segment and a sheet to be glued with the bottom, and to connect and glue the folded bottom and the sheet, the bottoming device comprising a gluer having an application head with a glue duct in which the glue is exposed to a pressure that is higher than ambient pressure such that the glue is transported throughout the application head, the application head including a plurality of valves each having at least one glue output orifice through which the glue is directly applied to the at least one of the folded bottom and the sheet, the valves being arranged in a configuration that includes at least a first valve row (VRi) and a second valve row (VRii) with each of the first and second valve rows extending along a length of the application head in a direction (y) that is transverse to a bag transfer direction (x), and a glue circulation channel that provides for circulation of the glue within the application head, the glue circulation channel including (i) a first transverse channel and a second transverse channel each extending along the length of the application head in the (y) direction, and (ii) a connection channel extending across the application head in the (x) direction, the connection channel connecting an end of the first transverse channel to an adjacent end of the second transverse channel, the glue circulation channel providing for glue flow through the first transverse channel, across the connection channel, and through the second transverse channel to drain from the application head.