Internal coating of a glass tube by plasma pulse-induced chemica

Details Internal coating of a glass tube by plasma pulse-induced chemica Internal coating of a glass tube by plasma pulse-induced chemica

1989-09-12

1991-10-22

Beck, Shrive

Glass manufacturing

Processes

Forming product or preform from molten glass

427 39, 427 38, 427166, 427237, 427238, 427 531, 65 311, 65 182, C03C 2502, B05D 306, B05D 722

Patent

active

050592319

ABSTRACT:
For producing a fiberoptic waveguide preforms by plasma pulse-induced chemical vapor deposition (PICVD), blank glass tubes are prepared having a continuously increasing internal diameter in the direction of gas flow. This type of blank compensates for the otherwise occurring decrease in the density of the layer-forming molecules due to pressure drop, thereby permitting the formation of a uniform masswise deposition of layer-forming molecules along the length of the tube. This permits the production of collapsed preforms having a series of coating layers of substantially uniform thickness.

REFERENCES:
patent: 4125389 (1978-11-01), King
patent: 4417911 (1983-11-01), Cundy et al.
patent: 4473596 (1984-09-01), Beerwald et al.

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