Glass manufacturing – Processes – Forming product or preform from molten glass
Patent
1983-03-04
1989-03-28
Kellogg, Arthur
Glass manufacturing
Processes
Forming product or preform from molten glass
65 311, 65 182, 65161, C03B 37018
Patent
active
048160504
ABSTRACT:
In order to prevent an uncontrolled collapse of a quartz tube whose inner surface is being coated with a vitrifiable substance in making a preform or parison of an optical fiber, one or more streams of carrier gas entraining the ingredients of the coating substance through the quartz tube are supplemented by a stream of supplemental carrier gas whose flow is being continuously controlled to keep the overall mass-flow rate substantially constant. The outer tube diameter is photoelectrically monitored and incipient changes thereof are compensated by controlling a flow of additional carrier or inert gas which does not pass through the tube but joins the traversing gas flow at the tube outlet, inside a solids separator with a restricted exit aperture, to modify the pressure differential across the tube wall.
REFERENCES:
patent: 1817338 (1931-08-01), Baker
patent: 4162904 (1979-07-01), Clay et al.
patent: 4165224 (1979-08-01), Irven
patent: 4280829 (1981-07-01), Sheth
patent: 4314837 (1982-02-01), Blankenship
patent: 4328017 (1982-05-01), Buehl
patent: 4378985 (1983-04-01), Powers
patent: 4389229 (1983-06-01), Jang et al.
CSELT - Centro Studi e Laboratori Telecomunicazioni S.P.A.
Dubno Herbert
Kellogg Arthur
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