Overflow downdrawn glass forming method and apparatus

Details Overflow downdrawn glass forming method and apparatus Overflow downdrawn glass forming method and apparatus

2005-05-10

2005-05-10

Vincent, Sean (Department: 1731)

Glass manufacturing

Processes

Fusion bonding of glass to a formed part

C065S121000, C065S195000

Reexamination Certificate

active

06889526

ABSTRACT:
One embodiment of the present invention is an improved sheet glass forming apparatus. In another embodiment, a precise thermal control system redistributes the flow of molten glass at the weirs to counteract the degradation of the sheet forming apparatus which inevitably occurs during manufacturing. In yet another embodiment, the invention introduces a counteracting force to the stresses on the trough in a manner such that the thermal creep which inevitably occurs has a minimum impact on the glass flow characteristics of the forming trough. Another embodiment creates a variable external cross-section which provides hydraulic stresses that are in opposition to the surface tension and body force stresses and thus, reduces the influence of surface tension and body forces. In an alternative embodiment, the glass is preferentially cooled across its width to create forming stresses during solidification, which ensures that the glass sheet drawn is inherently flat. In an additional embodiment, the internal pressure is adjusted in each of the major components of the forming apparatus such that the pressure difference across any leakage path to the forming zone is essentially zero. Therefore, air leakage in the apparatus is minimized even though the cracks and openings exist during initial operation and develop during manufacturing.

REFERENCES:
patent: 1759229 (1928-02-01), Drake
patent: 1673907 (1928-06-01), Ferngren
patent: 1697227 (1929-01-01), Danner
patent: 1731260 (1929-10-01), Nobbe
patent: 1829639 (1931-10-01), Ferngren
patent: 1829641 (1931-10-01), Ferngren
patent: 1841579 (1932-01-01), Fraser
patent: 1891370 (1932-12-01), Danner
patent: 3149949 (1964-09-01), Dockerty et al.
patent: 3338696 (1967-08-01), Dockerty
patent: 3433613 (1969-03-01), Dockerty
patent: 3437470 (1969-04-01), Overman
patent: 3451798 (1969-06-01), Simon
patent: 3506429 (1970-04-01), Overman
patent: 3519411 (1970-07-01), Cortright et al.
patent: 3589887 (1971-06-01), Ward
patent: 3607182 (1971-09-01), Leibowitz
patent: 3682609 (1972-08-01), Dockerty
patent: 3723082 (1973-03-01), Knowles et al.
patent: 4214886 (1980-07-01), Shay et al.
patent: 4416678 (1983-11-01), Bottger
patent: 5374595 (1994-12-01), Dumbaugh, Jr. et al.
patent: 6319867 (2001-11-01), Chacon et al.
patent: 20010039814 (2001-11-01), Pitbladdo
patent: 20030110804 (2003-06-01), Fenn et al.
patent: 20030192349 (2003-10-01), Meda et al.
patent: 20040055338 (2004-03-01), Helfinstine et al.
patent: 1596484 (1967-07-01), None
patent: 1596402 (1967-12-01), None
patent: 1596403 (1967-12-01), None
patent: 21 58 253 (1971-11-01), None
patent: 31 11484 (1983-02-01), None
patent: 33 16795 (1983-11-01), None
patent: 31 11484 (1983-12-01), None
patent: 33 14540 (1983-12-01), None
patent: 3329843 (1984-05-01), None
patent: 3507852 (1985-08-01), None
patent: 3518137 (1986-01-01), None
patent: 43 36 046 (1993-10-01), None
patent: 43 26 143 (1993-12-01), None
patent: 196 44 673 (1998-04-01), None
patent: 198 09 878 (1999-09-01), None
patent: 198 40 113 (2000-03-01), None
patent: 19964043 (2001-07-01), None
patent: 100 21 013 (2001-11-01), None
patent: 100 28 741 (2001-12-01), None
patent: 1549081 (1967-12-01), None
patent: 1549915 (1968-01-01), None
patent: 982153 (1965-02-01), None
patent: 09110443 (1997-04-01), None
patent: 10291827 (1998-11-01), None
patent: 11-246230 (1999-09-01), None
patent: 2001-80922 (1999-09-01), None
Bottger, et al.; “LCD substrate—the future process” International Glass Review, Issue 2—2000; 3 pages.
Bocko, Peter L. and Mitchell, Mark H. “AMLCD Glass Substrates—Foundation for High-Tech Displays” The GlassReseacher, vol. 12, No. 1, pp. 26-29, 2002, no month available.
Varshneya, Arun, “Fundamentals of Inorganic Glasses”, Academic Press, Inc., 1994, pp. 534-540.
Snyder, R.D./Byars, E.F., “Engineering Mechanics”, McGraw-Hill Book Company, 1973, pp. 349-350.
Kingery, W.D.; Bowen, H.K.; Uhlmann, D.R., “Introduction to Ceramics”, John Wiley & Sons, 1976, pp. 705-767.

Affiliated with

Also associated with

Rating

Overflow downdrawn glass forming method and apparatus does not yet have a rating. At this time, there are no reviews or comments for this patent.

If you have personal experience with Overflow downdrawn glass forming method and apparatus, we encourage you to share that experience with our LandOfFree.com community. Your opinion is very important and Overflow downdrawn glass forming method and apparatus will most certainly appreciate the feedback.

Rate now

Comments { 0 }

Profile ID: LFUS-PAI-O-3396080