Method for producing glass preform

Details Method for producing glass preform Method for producing glass preform

1998-09-08

2000-04-18

Hastings, Karen M.

Glass manufacturing

Processes

With measuring, sensing, inspecting, indicating, or testing

65 321, 65377, C03B 1906

Patent

active

060501081

ABSTRACT:
A method for producing a glass preform by synthesizing a porous glass preform by a vapor-phase synthesizing method and heating said porous glass preform in a vacuum or reduced-pressure atmosphere so as to consolidate said porous glass preform, which comprises the steps of: a first step of degassing said porous glass preform to thereby remove gas adsorbed or contained therein; a second step of temporarily contracting said porous glass preform at a temperature higher than a temperature in the first step and lower than a consolidation temperature; and a third step of consolidating said porous glass preform at the consolidation temperature; the degassing of said first step is determined in accordance with the bulk density of said porous glass preform.

REFERENCES:
patent: 4842628 (1989-06-01), Kreutzer et al.

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