Method for furnishing glass tube with internal glass spiral

Details Method for furnishing glass tube with internal glass spiral Method for furnishing glass tube with internal glass spiral

1995-12-21

1997-06-17

Czaja, Donald E.

Glass manufacturing

Processes

Fusion bonding of glass to a formed part

65 57, 65109, C03B 23057, C03B 2313

Patent

active

056392885

ABSTRACT:
A method to provide a glass tube with an internal glass spiral being formed from a straight glass rod and fastened to the internal wall of the glass tube by merging the glass rod with the glass wall in the line of contact between the glass wall and the spiral wherein the glass rod is conducted into the glass tube through a guiding tube placed inside the glass tube at a velocity v.sub.1 relative to the guiding tube, the guiding tube being provided with a heating zone at its front end inside the glass tube, the glass rod being heated to its softening point in the heating zone before leaving the guiding tube through a mouth piece, at the same time the glass tube and/or the guiding tube being rotated at a frequency n, and the glass tube being moved at a velocity v.sub.2 relative to the guiding tube.

REFERENCES:
patent: 1926552 (1933-09-01), Morgan
patent: 3186820 (1965-06-01), Adkins
patent: 3837830 (1974-09-01), Eberhart

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