Method and apparatus for modifying the transverse cross section

Details Method and apparatus for modifying the transverse cross section Method and apparatus for modifying the transverse cross section

1990-10-31

1993-06-22

Lindsay, Robert L.

Glass manufacturing

Processes

Forming product or preform from molten glass

65 311, 65 23, 65113, 65292, 82 111, 82118, 36447412, C03B 1900

Patent

active

052213064

ABSTRACT:
The transverse cross section of a body is modified by the steps of: a) determining the extent to which the body has material in excess of a desired shape at a plurality of points, b) exposing the body to a local heat source having a temperature sufficiently high to remove material from the surface of the body, and c) moving the surface of the body in relation to the source at a speed which decreases in regions where the body has material in excess of the desired shape so as to remove more material from such regions than from other regions. In a preferred embodiment, the body is an optical fiber preform, the local heat source is the fireball of a plasma torch, and the body is moved relative to the torch by rotating the preform at a controllable angular velocity while the torch is translated along the length of the preform.

REFERENCES:
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patent: 4498917 (1985-02-01), Weinstein et al.
patent: 4564914 (1986-01-01), Ballough et al.
patent: 4759243 (1988-07-01), Thompson
patent: 5000771 (1991-03-01), Fleming et al.

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