Patent ID: 6035663
Filing Date: 2000-03-14
Classification: C03B

Abstract:
A method of forming a cased glass stream in which glass from first and second sources is delivered to a pair of aligned orifices in such a way that glass from the second source forms a casing around an inner core of glass from the first source, wherein the improvement comprises controlling rate of glass flow from said second source according to the steps of:(a) delivering casing glass at said second source from glass batch means through a furnace to a spout having an opening through which glass flows by gravity to said orifices,(b) measuring rate of casing glass flow from said glass batch means through said furnace,(c) comparing the rate of casing glass flow measured in said step (b) to preset limits selected to obtain a desired ratio between core and casing glass in the cased glass stream, and(d) automatically adjusting rate of casing glass flow through said opening so as to maintain the rate of casing glass flow measured in said step (b) between said preset limits.