Process for manufacturing quartz glass pipes having a high conte

Details Process for manufacturing quartz glass pipes having a high conte Process for manufacturing quartz glass pipes having a high conte

1990-04-17

1991-06-25

Lindsay, Robert L.

Glass manufacturing

Processes

With measuring, sensing, inspecting, indicating, or testing

65 87, 65188, 65191, 65161, C03B 1514

Patent

active

050264133

ABSTRACT:
A process is described for manufacturing vertically withdrawn pipes from quartz glass or glasses having a high content of silica with only minor diameter deviation. In an electrically heated furnace, the initial material is heated up to the softening point. A pipe is formed in a deformation zone and is downwardly withdrawn. In this deformation zone, a constant pressure difference is maintained between the pressure in the pipe interior and the pressure in a chamber and/or heating chamber. The pressure is continuously measured and controlled so as to be at a constant difference. In order to maintain a higher pressure in the pipe interior as opposed to the pressure in the chamber and/or the heating chamber, the withdrawn pipe end of the pipe to be manufactured is sealed.

REFERENCES:
patent: 2150017 (1939-03-01), Barnard
patent: 2396254 (1940-03-01), Everett
patent: 3190739 (1965-06-01), Wilson
patent: 3410672 (1968-11-01), Lajarte
patent: 3556758 (1971-01-01), Andrews et al.
patent: 3620704 (1971-11-01), Gray

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