Method and apparatus for delivering a coated glass stream for forming

Abstract

A method and apparatus for delivering a coated glass stream having a first inner layer and a second outer layer wherein the method comprises providing a vertical orifice, delivering molten glass from a first source through the orifice, providing a gap about the orifice intermediate its upper and lower ends, delivering glass from a second source about the gap such that the glass from the second source flows through the gap to provide an outer layer about the glass from said first source as it flows through the orifice, and controlling the size and shape of the gap parallel to the flow and the size of the gap perpendicular to the flow such that the gap provides sufficient flow resistance and the gap is of sufficient size and shape to prevent clogging. The method includes mounting a metal cooling manifold on a periphery of said pan and extending around said second orifice ring mounting a metal fuel/air manifold mounted on said metal cooling manifold and extending around said second orifice ring, providing a fuel/air combustion chamber between second orifice ring, said pan and said fuel/air manifold, providing a plurality of passage means in said fuel/air manifold opening into said combustion chamber and feeding a fuel air mixture into said combustion chamber, positioning said cooling manifold beneath said fuel/air manifold and directing cooling gas to said cooling manifold so as to cool said pan, said fuel/air manifold and said means carried by said pan.