Patent ID: 8459062

Claim:
An apparatus for producing glass ribbon comprising: a drawing device configured to draw molten glass into a glass ribbon in a draw direction along a draw plane of the apparatus; a viscous zone located along the draw direction, a setting zone adjacent to the viscous zone along the draw direction wherein the glass ribbon is set from a viscous state to an elastic state with a desired cross-sectional profile, an elastic zone adjacent to the setting zone along the draw direction wherein the cross-sectional profile of the glass ribbon is frozen, and a severed zone wherein distinct glass sheets are formed by severing an upstream portion of the glass ribbon; a temperature adjustment apparatus including a plurality of temperature adjustment elements positioned at respective lateral locations along at least one temperature adjustment axis extending transverse to the draw direction, wherein the at least one temperature adjustment axis is located in one or more of the viscous zone, the setting zone, and the elastic zone, and wherein the temperature adjustment elements are configured to adjust a transverse temperature profile of the glass ribbon along a width of the glass ribbon; a stress sensor apparatus configured to measure a stress characteristic of the glass ribbon at respective lateral locations along a first stress sensing axis extending along a width of the glass ribbon located in the elastic zone and optionally along a second stress sensing axis located within the severed zone; and a control device configured for at least periodic thermal stress compensation of the glass ribbon by independently adjusting operation of the temperature adjustment elements based on stress characteristic information at least periodically obtained from the stress sensor apparatus.