Thermal control of the bead portion of a glass ribbon

Details Thermal control of the bead portion of a glass ribbon Thermal control of the bead portion of a glass ribbon

2009-02-27

2011-10-18

Lazorcik, Jason L (Department: 1741)

Glass manufacturing

Processes

Forming product or preform from molten glass

C065S090000, C065S097000

Reexamination Certificate

active

08037716

ABSTRACT:
Methods and apparatus for controlling the stress in, and the shape of, the glass ribbon (15) formed in a downdraw glass manufacturing process (e.g., the fusion downdraw process) are provided. In certain embodiments, the control is achieved by cooling the bead portions (21a,21b) of the ribbon (15) at a rate which provides a heat flux Q″bat the thickest part of the bead (23a,23b) which is given by Q″b=Q″q+ΔQ″, where (i) Q″qis the heat flux at a transverse position adjacent to the bead portion (21a,21b) at which the ribbon's thickness equals 1.05*tcenter, where tcenteris the final thickness at the ribbon's center line (17), and (ii) ΔQ″≧(tb/tq−1)Q″q+10 kilowatts/meter2, where tbis the thickness of the thickest part of the bead portion. The cooling can take place along the entire length of the ribbon (15) or at selected locations, e.g., in the portion (50) of the draw which includes the glass transition temperature region (31) or the portion (60) of the draw where individual glass sheets (13) are cut from the ribbon (15).

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