Method and apparatus for manufacturing profiled glass tubing

Details Method and apparatus for manufacturing profiled glass tubing Method and apparatus for manufacturing profiled glass tubing

1990-05-14

1991-10-15

Lindsay, Robert L.

Glass manufacturing

Processes

Forming product or preform from molten glass

65187, C03B 1514

Patent

active

050571362

ABSTRACT:
Methods of an apparatus for producing profiled glass tubing utilizing the Danner process comprise flowing the molten glass over profiled blowpipe heads which are "super-profiled" in that the angles of ridges and grooves are more acute than the ridges and grooves resulting in the glass tubing. The particular profiles of the glass tubing are controlled by selecting the necessary drawing speed, viscosity of the glass, internal air pressure at the blowpipe head and throughput rate of the glass melt.

REFERENCES:
patent: Re28600 (1975-11-01), Lemelson
patent: 1218598 (1917-03-01), Danner
patent: 1574482 (1926-02-01), Hirsch
patent: 2390925 (1945-12-01), Danner
Von Erwin Roeder et al., "Das Dusenschwellphanomen--eine Erscheinung beim Strangpressen von Glasschmelzen", Glastechnische Berichte, 54 (1981), Nr. 5, S. 131-135.

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