US 12,129,197 B2
Apparatus and method for producing glass ribbons
Alexander Glacki, Mainz (DE); Christian Breitbach, Darmstadt (DE); Holger Hunnius, Mainz (DE); Ulrich Lange, Mainz (DE); Wolfgang Münch, Budenheim (DE); Gregor Rösel, Ginsheim-Gustavsburg (DE); and Holger Wegener, Alfeld (DE)
Assigned to SCHOTT AG, Mainz (DE)
Filed by SCHOTT AG, Mainz (DE)
Filed on Jul. 24, 2020, as Appl. No. 16/938,092.
Claims priority of application No. 10 2019 120 064.4 (DE), filed on Jul. 24, 2019.
Prior Publication US 2021/0024399 A1, Jan. 28, 2021
Int. Cl. C03B 17/06 (2006.01)
CPC C03B 17/061 (2013.01) [C03B 17/067 (2013.01); C03B 17/068 (2013.01)] 20 Claims
OG exemplary drawing
 
20. An apparatus for producing thin glass ribbons from a molten glass, the apparatus comprising:
a drawing tank having an inlet for the molten glass, a wall and a nozzle opening through the wall, wherein the drawing tank has an upper portion transversely to the drawing direction of the glass ribbon, that is along the longitudinal extension of the nozzle opening and wherein the nozzle opening being configured to allow the molten glass to exit the drawing tank and produce the thin glass ribbons with a thickness up to 3000 μm;
a direct heater having a heating circuit and a power source, the heating circuit defining a first heating zone to heat the drawing tank, the power source operatively connected to the heating circuit, the heating circuit having power connections that connect the heating circuit to the wall so that a current from the power source flows through a current-carrying portion of the wall to heat the wall;
an indirect heater having a heating element defining a second heating zone to heat the drawing tank, wherein the direct heater comprises a plurality of heating circuits defining a plurality of the first heating zones arranged on and around the drawing tank in a horizontally distributed manner, wherein the drawing tank comprises collars as the power connections for direct conductive heating.