Furnace for producing high purity quartz glass preform

Details Furnace for producing high purity quartz glass preform Furnace for producing high purity quartz glass preform

1989-12-29

1991-07-16

Bennet, Henry A.

Heating

Work chamber having heating means

Interior bell forms muffle

65157, 6537713, 6537415, 432242, 432244, 432253, C03B 3714, C03B 2000, F27B 1100

Patent

active

050320793

ABSTRACT:
There is provided a heating furnace comprising a furnace body, a cylindrical zone heater in the furnace body, a muffle tube installed through the furnace body for thermally treating a porous preform made of high purity quartz glass by moving the preform vertically therethrough and a partition means in the portion of the muffle tube projecting above the furnace body to divide an interior space of the muffle tube into an upper space and a lower one.

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