Glass manufacturing – Processes – Reshaping or surface deformation of glass preform
Patent
1977-06-30
1979-03-27
Kellogg, Arthur D.
Glass manufacturing
Processes
Reshaping or surface deformation of glass preform
65112, 65155, 65270, 65271, C03B 3308
Patent
active
041463803
ABSTRACT:
A focused laser beam is directed at the wide side surface of a long, sealed, gas-filled, glass tube having a longitudinal axis and an elongated cross section. Repeated relative back and forth movement is introduced between the laser beam and the wide surface of the tube transverse to its longitudinal axis to heat and soften the tube along a cut line until the tube divides to form ends and collapses to seal the divided ends. Preferably, the tube is held in fixed position, while the laser beam is scanned across both of its wide side surfaces. The intensity and/or the velocity of the laser beam are modulated. After the tube divides along the cut line, the divided ends are annealed while still in the tube holder by defocusing the laser beam. In one embodiment, plural simultaneous cuts are made by directing a plurality of focused laser beams onto the tube at spaced intervals along its longitudinal axis.
REFERENCES:
patent: 2613479 (1952-10-01), Stong
patent: 3580710 (1971-05-01), Britt et al.
patent: 4045201 (1977-08-01), Cafarella et al.
Caffarella Thomas E.
Radda George J.
Watts David J.
American Atomics Corporation
Kellogg Arthur D.
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