Devitrification resistant flame hydrolysis process

Details Devitrification resistant flame hydrolysis process Devitrification resistant flame hydrolysis process

1982-09-29

1984-12-04

Bashore, S. Leon

Glass manufacturing

Processes

Forming product or preform from molten glass

65 312, C03B 37025

Patent

active

044862121

ABSTRACT:
Porous glass optical fiber preforms are conventionally formed by depositing many layers of glass soot on a mandrel, removing the mandrel, and heating the porous preform to form a consolidated glass article. To prevent the formation of a devitrified layer at the aperture-forming surface during the consolidation step, the rate of soot deposition is initially reduced so that a stratum of fine soot is initially deposited on the mandrel. The stratum is initially discontinuous, but after a plurality passes of the soot-producing burner, it becomes continuous. Thereafter, the formation of the remainder of the soot preform continues in a conventional manner.

REFERENCES:
patent: 3775075 (1973-11-01), Keck et al.
patent: 3826560 (1974-07-01), Schultz
patent: 3877912 (1975-04-01), Shirarshi et al.
patent: 4125388 (1978-11-01), Powers
patent: 4204851 (1980-05-01), Nolan
patent: 4251251 (1981-02-01), Blankenship
patent: 4289522 (1981-09-01), Bailey et al.
patent: 4298365 (1981-11-01), Bailey et al.

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