Process to preserve isopipe during coupling

Details Process to preserve isopipe during coupling Process to preserve isopipe during coupling

2008-02-08

2011-10-11

Lazorcik, Jason L. (Department: 1741)

Glass manufacturing

Processes

Forming product or preform from molten glass

C065S053000, C065S099100, C065S195000

Reexamination Certificate

active

08033137

ABSTRACT:
Methods for reducing stress on an isopipe during manufacture of a drawn glass sheet are disclosed including a method comprising providing an isopipe having a root, heating the isopipe to a predetermined temperature, maintaining the isopipe at the predetermined temperature for a period of time sufficient to relieve at least a portion of a tensile stress on the isopipe root, coupling the isopipe to a down-comer, and then providing glass to the isopipe. Also disclosed is a method comprising heating an isopipe such that the temperature difference between the weir and the root of the isopipe, after heating and prior to coupling, is less than about 100° C. A method comprising application of a compressive force to the ends of an isopipe root during heating is also disclosed.

REFERENCES:
patent: 3437470 (1969-04-01), Overman
patent: 3519411 (1970-07-01), Cortright et al.
patent: 7681414 (2010-03-01), Pitbladdo
patent: 2003/0121287 (2003-07-01), Chalk et al.
patent: 2005/0138966 (2005-06-01), Pitbladdo
patent: 2008/0282736 (2008-11-01), Filippov et al.

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