VAd process improvements

Details VAd process improvements VAd process improvements

1993-02-22

1994-01-25

Lindsay, Robert L.

Glass manufacturing

Processes

Forming product or preform from molten glass

65 182, 65 608, C03B 37023

Patent

active

052812480

ABSTRACT:
In a VAD method for making optical fiber preforms, the yield is increased by terminating or significantly reducing the supply of glass raw material to the torch (24) just after glass jacket soot (23, FIG. 4) has been deposited at the bottom end of the glass rod (20). The fuel supply to the torch is maintained, however, and the flame continues to be projected from the torch toward the deposited soot boule (23). The rate of vertical movement of the glass rod is increased until the flame is directed at the bottom end (27') of the soot boule. The flame is then allowed to dwell for a sufficient period to increase significantly the temperature of the bottom end of the soot boule and to consolidate partially the bottom end of the soot boule. This has the effect of containing the soot and countering the effects of gravity on the delicate soot boule that might otherwise cause it to crack.

REFERENCES:
patent: 4367085 (1983-01-01), Suto et al.
patent: 4618354 (1986-10-01), Suda et al.
patent: 4915716 (1990-04-01), Monroe et al.
patent: 5207813 (1993-05-01), Danzuka et al.
patent: 5211732 (1993-05-01), Abbott et al.
"Double-Flame VAD Process for High-Rate Optical Preform Fabrication," H. Suda et al. Electronics Letters, vol. 21, No. 1, Jan. 3, 1985, pp. 29-30.
"Optical Fiber Communications," B. K. Tariyal et al., Encyclopedia of Physical Science and Technology, vol. 11, Academic Press, 1992, pp. 612-621.

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