Glass manufacturing – Processes – Forming product or preform from molten glass
Patent
1991-09-09
1992-05-05
Lindsay, Robert L.
Glass manufacturing
Processes
Forming product or preform from molten glass
65 2, 65 12, C03B 3709
Patent
active
051103338
ABSTRACT:
A bushing assembly 10 through which molten glass 14 is extruded to form fiberglass filaments 12 includes a bushing 22 defining an extrusion face 32. Molten glass flows through the bushing 22 of the extrusion face 32. The extrusion face 32 has a plurality of integrally formed tips 46. The bushing 22 is heated by ceramic heater blocks 42 having resistance heating elements 64 encased in slots 62. A frame 20 holds the bushing assembly 10 including the bushing 22 and heater blocks 42 on an opening 18 of a forehearth 16. Cooling fins 50 and cooling tubes 52 are attached to the bushing assembly to cool the tips 48 and fiberglass filaments 12 after extrusion. Methods of making the bushing and bushing assembly 10 are also disclosed including the steps of hydroforming the bushing 22, punching a plurality of holes 48 in the extrusion face 32, forming tips 48 on each hole and machining the tips 48 to a uniform length. The bushing assembly method also includes the steps of attaching ceramic heater blocks 42 and cooling means (50,52) with the frame 20 into the opening 18 of the forehearth 16.
REFERENCES:
patent: 2460547 (1949-02-01), Stevens
patent: 2949633 (1960-08-01), Drummond et al.
patent: 3134659 (1964-05-01), Labino
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patent: 3164458 (1965-01-01), Mitchell
patent: 3623857 (1971-11-01), McFadden et al.
patent: 3779730 (1973-12-01), Ramage
patent: 3837823 (1974-09-01), Shealy
patent: 4363645 (1982-12-01), Eisenberg
The Manufacturing Technology of Continuous Glass Fibres, Glass Science and Technology K. L. Loewenstein, Published by Elsevier 1983.
Thin Wall Perimeter Bushing, Ronald O. McCormick Oct. 8, 1984.
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