Process and apparatus for the vertical drawing of glass tubes wi

Details Process and apparatus for the vertical drawing of glass tubes wi Process and apparatus for the vertical drawing of glass tubes wi

1988-12-28

1990-06-26

Lindsay, Robert L.

Glass manufacturing

Processes

Forming product or preform from molten glass

65 88, 65188, 15624418, C03B 1518

Patent

active

049368915

ABSTRACT:
A process for the vertical drawing of glass tubes, optionally with safety strips, sealed bottoms, and, if desired, a pressure equalizing aperture wherein specific tube lengths are severed in succession from a continuous glass tube rod. The glass tube rod, closed at its beginning and exiting through a feeder head from a vessel which contains molten glass, is introduced, being under atmospheric pressure in the interior of the glass tube rod, in the still plastic condition into a pressure tank located downstream of the feeder head where the glass tube rod is exposed to a defined pressure and is conducted on a non-plastic condition out of the pressure tank by drawing. Thereafter, by heating the glass tube rod at an interval after leaving the pressure tank, a specific tube length is severed from the continuous glass tube rod essentially simultaneously with the formation of bottoms that seal the melted-off tube length and the continuous glass tube rod.

REFERENCES:
patent: 1766638 (1930-06-01), Howard
patent: 1892126 (1932-12-01), Bailey
patent: 2150017 (1939-03-01), Barnard
patent: 2172899 (1939-09-01), Barnard
patent: 2390926 (1945-12-01), Danner
patent: 3554828 (1971-01-01), Schnedding et al.
patent: 3666583 (1972-05-01), Pei
patent: 3852053 (1974-12-01), Einramhof et al.
patent: 4525194 (1985-06-01), Rudoi

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