Patent ID: 6622525
Filing Date: 2003-09-23
Classification: C03B,Y02P

Abstract:
Apparatus for forming a cased glass stream having an inner core glass surrounded by an outer casing glass, said apparatus including:a core glass source for delivering core glass through a first orifice, a housing forming a second orifice vertically spaced beneath and aligned with said first orifice with a chamber surrounding said second orifice and communicating with said second orifice through a gap between said first and second orifices, a casing glass source for delivering casing glass to said chamber, such that glass flows by gravity from said sources through said orifices to form said cased glass stream, said casing glass source including a spout having an outlet opening and a spout tube disposed within said spout for controlling delivery of casing glass through said spout opening, and a source of gas at continuous elevated pressure coupled to said interior volume of said tube, and through said tube to said opening, continuously maintaining said interior volume of said tube at a pressure above ambient pressure surrounding said spout.