Method and device for fire-polishing a lengthwise extended glass

Details Method and device for fire-polishing a lengthwise extended glass Method and device for fire-polishing a lengthwise extended glass

1996-04-12

1998-12-01

Griffin, Steven P.

Glass manufacturing

Processes

With measuring, sensing, inspecting, indicating, or testing

65 2919, 65 65, 65104, 65120, 65158, 65162, 65271, 65279, 65284, 65292, 65377, 65378, 65384, 65385, 65484, 65485, 65488, C03B 23045, C03B 37012

Patent

active

058431993

ABSTRACT:
During the fire-polishing of a lengthwise extended glass body (3), for example a preform for drawing optical fibers, the glass body (3) is held by a holding device (5, 7), and is heated by a burner (23) moving at a variable advancing speed parallel to the lengthwise axis (19). The surface temperature of the glass body (3) is determined with a temperature measuring device (25). The mechanical stress condition of the glass body (3) is detected with an optical device (29) and can be controlled by varying the burner temperature and/or the advancing speed of the burner. The invention makes it possible to counteract the occurrence of high mechanical stresses in the glass body (3).

REFERENCES:
patent: 172624 (1876-01-01), Hall
patent: 2370918 (1945-03-01), Rohl
patent: 2731772 (1956-01-01), Ehret, Jr. et al.
patent: 3263852 (1966-08-01), Fridrich
patent: 3485613 (1969-12-01), Herczog et al.
patent: 3537833 (1970-11-01), Gossie et al.
patent: 3576611 (1971-04-01), Obersby
patent: 4578101 (1986-03-01), Clark et al.
patent: 4619681 (1986-10-01), Tetaz et al.
patent: 4702132 (1987-10-01), Grosse
patent: 4731103 (1988-03-01), Mizutani et al.
patent: 5158589 (1992-10-01), Curtis et al.
patent: 5192350 (1993-03-01), Le Sergent
patent: 5211730 (1993-05-01), Kanamori et al.
Strainoptic.TM. Universal Polarimeter System PS-100 Bulletin PS-101.

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