Patent ID: 7735338
Filing Date: 2010-06-15
Classification: C03B,Y02P

Abstract:
1. A method of producing thin glass panes, in particular glass panes with a thickness of less than 1 mm, said method comprising the steps of: a) conveying a glass melt from a tank furnace, through a vertical inlet and to a drawing tank with a nozzle system, said nozzle system having at least one slit nozzle; b) drawing a glass ribbon vertically downward from the at least one slit nozzle; c) setting a total throughput by setting a length and cross section of the vertical inlet and by definite heating and cooling of the vertical inlet so as to control glass melt viscosity in the vertical inlet in such a way that a pressure of the glass melt in the vertical inlet, said pressure being due to a level difference between a free surface height of the glass melt and a nozzle system height, significantly decreases; and d) setting a throughput per unit of length in a lateral direction along the glass ribbon by setting nozzle system geometry and by definite heating and cooling of segments of the drawing tank and the at least one slit nozzle so as to control glass melt viscosity in the nozzle system, so that upon emerging from the nozzle system, glass does not wet an underside of the at least one slit nozzle in the vicinity of a breaking edge; wherein the setting of the total throughput and the setting of the throughput per unit of length are largely decoupled from each other so that process control is simplified.