Glass manufacturing – Processes – Forming product or preform from molten glass
Patent
1991-10-16
1993-02-23
Lindsay, Robert L.
Glass manufacturing
Processes
Forming product or preform from molten glass
65 182, 427163, 427167, 427237, 427578, C03C 2502, C03B 37023
Patent
active
051886480
ABSTRACT:
In the PCVD method glass is deposited in layers on the inner wall of a glass tube by heating the tube to a temperature between 1100.degree. and 1300.degree. C., by passing a reactive gas mixture through the glass tube from a gas inlet side at a pressure between 1 and 30 hPa, by forming a plasma in the interior of the glass tube, and by reciprocating the plasma between two reversal points. After a quantity of glass corresponding to the desired fiber optical construction has been deposited, the tube is collapsed to form a solid preform from which optical fiber are draw. The range of nonconstant deposition geometry at the preform entrance, (i.e. on the gas inlet side), is reduced by interrupting the reciprocating movement of the plasma at the reversal point on the gas inlet side.
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Geittner Peter E. E.
Hagemann Hans-Jurgen
Warnier Jacques P. M.
Bartlett Ernestine C.
Lindsay Robert L.
U.S. Philips Corp.
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