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.

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 opposing rows of 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 in directions essentially normal to the primary blast to increase the attentuation of the fibers and the temperature of the primary blast at one or more locations spaced downstream from the location where primary glass is delivered to said primary blast. 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.