Glass manufacturing – Processes – Forming product or preform from molten glass
Patent
1984-04-19
1986-01-21
Lindsay, Robert
Glass manufacturing
Processes
Forming product or preform from molten glass
65 2, 65 111, 65 12, C03D 37027
Patent
active
045655570
ABSTRACT:
Apparatus and method for pulling optical glass fibers in a containerless environment is disclosed which includes a single-axis acoustical levitation furnace (10) in which a specimen (S) is levitated and melted. A reflector unit (16) is carried in the interior of the furnace and includes a reflector (16a) disposed centrally about the acoustical axis of the levitator. The reflector unit includes a circular shroud (32) of insulation and a copper sleeve (34) inserted in the unit which is hollow at (34a) for receiving a cooling medium (38). A fiber pulling bore (40) is formed centrally in the reflector unit surrounded by cooling jacket (34a) to enhance solidification and formation of a fiber (F). A starting fiber strand is introduced into the melt and pulled outwardly through bore (40) whereby the specimen fiber is started and formed as pulled therethrough. In order to replenish the melt and thus enable a continuous process, a movable secondary reflector (42) is provided which captures a supplemental specimen pellet (46) and by movement of the reflector transfers it to the melt (S).
REFERENCES:
patent: 2908545 (1959-10-01), Teja
patent: 3155475 (1964-11-01), Ashman
patent: 3944640 (1976-03-01), Haggerty
patent: 4061484 (1977-12-01), Aulich et al.
patent: 4344787 (1982-08-01), Wong et al.
patent: 4363646 (1984-12-01), Torobin
Acusticfield Positioning for Containerless Processing, Ultrasonics, Nov. 1975, pp. 251-261, Whymark.
Ethridge Edwin C.
Naumann Robert J.
Beumer Joseph H.
Lindsay Robert
Manning John R.
The United States of America as represented by the Administrator
Wofford, Jr. Leon D.
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