Patent ID: 8726697

Claim:
A convection heating furnace for a glass sheet, which glass sheet arrives and moves along on moving rolls in a glass moving direction in said furnace, said furnace comprising: air heating elements which heat air, which heated air is then blasted against, the moving glass sheet, a plurality of elongated channels disposed laterally adjacent one another and longitudinally in the glass moving direction, said elongated channels capable of blasting the heated air moving in the glass moving direction the moving glass sheet, and into which said elongated channels at least a part of said air heating elements are fitted, and a respective row of elongated casings for each respective said elongated channel of said plurality of elongated channels, and each said row being disposed longitudinally along the respective said elongated channel, each said row of elongated casings having said elongated casings of each row a) disposed laterally adjacent one another and b) disposed longitudinally perpendicular to the glass moving direction, and each said elongated casing being in fluid communication with the heated air in the respective said elongated channel, redirecting the heated air in the respective said elongated channel against an adjacent portion of the moving glass to heat the glass, including a row of air blasting nozzles, which said nozzles direct the heated air against the glass, said row of air blasting nozzles including a) flank air blasting nozzles at each side of said casing which direct heated air from the respective said elongated channel against the glass sheet, and b) one or more intermediate air blasting nozzles which are intermediate said flank air blasting nozzles, including two shaped formed metal sheets with joints of each said sheet which are joined together to form said elongated casing including said air blasting nozzles, having a direction of air flow in said elongated casing which is essentially in a same direction as an air flow in said air blasting nozzles, a casing space provided between consecutive said casings of each row, which said casing spaces serve as a first return route for the heated air after said heated air is directed at the moving glass and a channel space provided between adjacent said channels for the return air to move from said casing spaces.