Method for forming a groove in a glass tube

Details Method for forming a groove in a glass tube Method for forming a groove in a glass tube

1989-09-11

1990-05-08

Lindsay, Robert L.

Glass manufacturing

Processes

Reshaping or surface deformation of glass preform

65277, 65283, C03B 2704

Patent

active

049234986

ABSTRACT:
A method for forming a groove in a glass tube without contacting the glass tube in the groove region. The method includes the steps of rotating the glass tube about its longitudinal axis, heating a localized area of the glass tube where a groove is to be formed sufficiently to soften the glass tube in the localized area, stretching the glass tube along its longitudinal axis by a first distance sufficient to cause a reduction in the diameter of the glass tube in the localized area, and compressing the glass tube along its longitudinal axis by a second distance sufficient to produce a groove in the localized area. The glass tube is rotated during the steps of heating, stretching and compressing the glass tube. Heating is preferably performed by directing the flames from one or more torches at the groove area.

REFERENCES:
patent: 1948560 (1934-02-01), Borneman
patent: 3263852 (1966-08-01), Fridrich
patent: 4582523 (1986-04-01), Marcucci et al.
patent: 4585468 (1986-04-01), Marcucci et al.
patent: 4818266 (1989-04-01), Saehs et al.

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