Title:
METHOD FOR MANUFACTURING GLASS PREFORM
Document Type and Number:
WIPO Patent Application WO/2019/225637
Kind Code:
A1
Abstract:
A method for manufacturing a glass preform, the method having: a depositing step for installing a starting rod and a burner for generating glass fine particles in a reaction container, introducing a siloxane as a glass raw material to the burner, oxidizing the glass raw material in a flame formed by the burner and generating glass fine particles, depositing the generated glass fine particles on the starting rod and fabricating a glass fine particle deposited body; and a transparentizing step for heating the glass fine particle deposited body and manufacturing a transparent glass preform, wherein, after the depositing step, the transparentizing step is performed after the glass fine particle deposited body is heated for a time range of one to eight hours in an oxygen-containing atmosphere at a temperature lower than the temperature of the transparentizing step.
Inventors:
HAYAKAWA MASATOSHI (JP)
ITO MASUMI (JP)
KONISHI TATSUYA (JP)
ITO MASUMI (JP)
KONISHI TATSUYA (JP)
Application Number:
PCT/JP2019/020238
Publication Date:
November 28, 2019
Filing Date:
May 22, 2019
Export Citation:
Assignee:
SUMITOMO ELECTRIC INDUSTRIES (JP)
International Classes:
C03B8/04; C03B37/014; C03B37/018
Foreign References:
| JP2004338992A | 2004-12-02 | |||
| JP2017536324A | 2017-12-07 |
Attorney, Agent or Firm:
SHIN-EI PATENT FIRM, P.C. (JP)
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