Glass manufacturing – Processes – Forming product or preform from molten glass
Patent
1989-05-12
1989-12-26
Lindsay, Robert L.
Glass manufacturing
Processes
Forming product or preform from molten glass
65 6, 65 9, 65 12, 65 14, 65 16, 264 8, 264 12, 425 7, 425 8, C03B 3706, C03B 3704
Patent
active
048895466
ABSTRACT:
Method and apparatus for attenuating glass fibers. Primary glass is delivered into a primary, high temperature, high velocity gaseous blast to produce fibers that are attenuated while carried by said primary blast. While the fibers are above the minimum glass attenuation temperature, the fiber containing primary blast is subjected to thin, closely spaced, high speed jets that deliver fuel and oxidant at a higher speed and less rate of mass flow than said primary blast essentially normal to the primary blast to increase the attenuation of the fibers and the temperature of the primary blast at one or more stations spaced downstream from the location where primary glass is delivered to one side only of said primary blast. The side of jet application may be the same or differ from one said station to another said station. Shields may be provided in spaced relation on opposite sides of the primary blast and closely offset from the opposing rows to limit the amount of atmospheric air that is entrained into the primary blast. Means is provided in heat exchanging relation with the shields to control the temperature of the surfaces of the shields so that fibers carried by the primary blast that engage the shields are prevented from sticking to the shields without lowering the temperature of the main body of the fibers to below the minimum temperature required for attenuation.
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