C - Chemistry – Metallurgy – 03 – B
Patent
C - Chemistry, Metallurgy
03
B
49/8
C03B 37/025 (2006.01) C03B 37/029 (2006.01)
Patent
CA 1199495
METHODS OF AND APPARATUS FOR HEATING A PREFORM FROM WHICH LIGHTGUIDE FIBER IS DRAWN Abstract of the Disclosure Apparatus for heating a vertically suspended preform from which lightguide fiber is drawn includes a torch having a plurality of ducts that open to a surface adjacent to a lower end of the preform. Fuel and oxidizing gases flow from the ducts, mix at the surface and flame about a necked-down, lower portion of the preform to form a melt cone from which the fiber is drawn. The ducts and the preform are positioned to cause a combustion zone of each flame to impinge upon the preform. In a preferred embodiment, the openings of the ducts are arrayed in a circle which is referred to as a pitch circle and which has a diameter that is less than that of the preform. Also, the ducts are arranged so that the gases are directed at a predetermined angle to the axis of the preform.
411282
Kirby Eades Gale Baker
Western Electric Company Incorporated
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