Overflow downdraw glass forming method and apparatus
Patent No. 6,990,834
Issued: January 31, 2006
Inventor: Pitbladdo; Richard B. (Naples, FL)
The present invention alters the flow path at the inlet of the sheet glass forming apparatus to improve quality. The bottom of the downcomer pipe is preferably shaped to alter the character of the vortex flow in the quiescent flow zone between the pipes. In another embodiment, a bead guide provides hydraulic stresses that are in opposition to the surface tension stress and thus reduces the influence of surface tension on the formation of thick beads on the edges of the sheet. The present invention also measures the temperature of the glass by immersing thermocouples in the glass, at locations where any defects caused by the immersion are in the glass that forms the unusable edges of the sheet. In another embodiment, the support structure for the trough is altered to substantially reduce the aging of the trough due to thermal creep.
REFERENCE TO RELATED APPLICATIONS
This application claims an invention that was disclosed in one of the following provisional applications:
1) Provisional Application No. 60/444,728, filed Feb. 4, 2003, entitled "SHEET GLASS FORMING APPARATUS";
2) Provisional Application No. 60/449,671, filed Feb. 24, 2003, entitled "SHEET GLASS FORMING APPARATUS";
3) Provisional Application No. 60/505,302, filed Sep. 23, 2003, entitled "TEMPERATURE MEASUREMENT FOR SHEET GLASS FORMING APPARATUS"; and
4) Provisional Application No. 60/534,950, filed Jan. 8, 2004, entitled "SHEET GLASS FORMING APPARATUS".
This is a divisional patent application of application Ser. No. 10/771,761, filed Feb. 4, 2004, entitled "OVERFLOW DOWNDRAW GLASS FORMING METHOD AND APPARATUS", now U.S. Pat. No. 6,895,782, issued May 24, 2005. The aforementioned application is hereby incorporated herein by reference.
In addition, this application is a continuation in part of U.S. application Ser. No. 10/214,904, filed on Aug. 8, 2002, entitled "OVERFLOW DOWNDRAW GLASS FORMING METHOD AND APPARATUS", now U.S. Pat. No. 6,889,526, issued May 10, 2005. The aforementioned application is hereby incorporated by reference.
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