Furnace for heating highly pure quartz preform for optical fiber

Details Furnace for heating highly pure quartz preform for optical fiber Furnace for heating highly pure quartz preform for optical fiber

1991-03-22

1992-05-19

Bennet, Henry A.

Heating

Work chamber having heating means

Interior bell forms muffle

432208, 432239, 432244, 65157, 65 13, C03B 3700, C03B 3714, C03B 2000

Patent

active

051143380

ABSTRACT:
A heating furnace for heating a porous preform made of fine particles of highly pure quartz glass for an optical fiber, which furnace comprises a cylindrical furnace body, a heater installed in said furnace body and a muffle tube installed inside said heater to separate a heating atmosphere from said heater, wherein said muffle tube is made of highly pure carbon and coated with a gas impermeable carbon, which furnace prevents contamination of the preform with impurities and has long life.

REFERENCES:
Tsunehisa Kyodo "Heating Oven for Optical Fiber . . . ", Patent Abstracts of Japan, Jun. 28, 1989, pp. (C-312) (3631).
Edahiro Takao "Optical Fiber Base Material Producing Furnace", Patent Abstracts of Japan, Apr. 10, 1980, (C-6) (528).
Kouzou Yoshimura "Production of Fibers for Optical Communication", Patent Abstracts of Japan, Jan. 26, 1979 (E-86) (39).
Yoichi Ishiguro "Production of Glass Article", Patent Abstracts of Japan, Mar. 29, 1988 (c-484) [2943].
Yoichi Ishiguro, "Production of High-Purity Transparent Glass", Patent Abstracts of Japan, Dec. 21, 1988 C-554(3338).
Tsunehisa Kiyoudou "Manufacturing Apparatus of Base . . . ", Patent Abstracts of Japan, Nov. 29, 1984 (c-254) [1697].

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