Glass manufacturing – Processes – Forming product or preform from molten glass
Patent
1991-06-21
1992-11-03
Lindsay, Robert L.
Glass manufacturing
Processes
Forming product or preform from molten glass
65 13, 65109, 65110, 65120, 65244, C03B 37025
Patent
active
051605201
ABSTRACT:
To produce a blank mold for glass fiber optical waveguides with a core and a single or multilayer sheath, in which the core glass material is applied to the inner wall of a glass tube by chemical deposition from the vapor phase, the internally-coated glass tube is caused to collapse by temperature treatment, and this blank mold is finally drawn out into a glass fiber, the temperature treatment for collapse is carried out along the glass tube in accordance with a temperature profile that is determined by an upper region of maximum glass temperature along the treated section of glass tube (hot zone) and a lower region at the glass softening temperature (soft zone). The region of maximum glass temperature shows a largely uniform temperature level with a width along the section of glass tube that is approximately equal to the width of the region at the glass softening temperature.
REFERENCES:
patent: 3876149 (1975-04-01), Futerko
patent: 4231777 (1980-11-01), Lynch et al.
patent: 4401267 (1983-08-01), Spainhour
patent: 4477244 (1984-10-01), Nis et al.
patent: 4645451 (1987-02-01), Schneider et al.
Keim Norbert
Wittmann Manfred
Kabelmetal Electro GmbH
Lindsay Robert L.
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