Glass manufacturing – Processes – Forming product or preform from molten glass
Patent
1976-01-20
1977-04-12
Lindsay, Jr., Robert L.
Glass manufacturing
Processes
Forming product or preform from molten glass
65 12, 65 29, 65162, C03B 3702
Patent
active
040172872
ABSTRACT:
In an electrical heating element apparatus and control system for tubular glass fiber bushings wherein a plurality of bushings are each individually temperature controlled by a compact power supply and control system and means are provided for mounting and holding the orifice tube fiber units in proper relationship, while at the same time providing the required electrical connection to them. The heating elements or the orifice tubes are connected in parallel across the secondary of a single transformer, and individual control elements are connected in series with each element on the secondary side of the transformer. A special fluid control system is used to provide for differential flow of cooling fluid across the face of the orifice tube. The cooling fluid is controlled along the length of the orifice tube by segmented units, that can be individually controlled to provide for varying cooling fluid flow along a given length of the orifice tube.
REFERENCES:
patent: 3625025 (1971-12-01), Jensen
patent: 3649231 (1972-03-01), Trethewey
patent: 3697241 (1972-10-01), Strickland et al.
patent: 3829301 (1974-08-01), Russell
Curley John E.
Lindsay, Jr. Robert L.
McDonald Alan T.
PPG Industries Inc.
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