| 摘要 |
In a method of upwardly drawing flat glass, two oppositely moving and similar streams of molten glass are advanced towards each other along the surface of a molten metal bath towards the line of draw at the point where the streams merge to form a body of molten glass from which the flat glass is drawn upwardly, contact of the streams with the molten metal minimizing local temperature variations in the glass approaching the line of draw. Two streams of glass are fed down platinum lined conduits 12, 13 positioned at each end of a tunnel 5 on to opposite ends of the surface of a bath 23 of a molten metal (e.g. tin or tin alloy) the two streams merging at 3, the point of draw. The tunnel is of greater width than the width of the sheet to be drawn. The temperature of <PICT:1074313/C1/1> the two approaching streams is made identical by controlling the temperature of the bath 23 through regulators 26 in the tank floor and by regulators 27 in the tunnel roof for effecting a heat exchange with the upper surface of the glass streams. Thus the point of draw is stabilized and a sheet of glass 1 is drawn upwardly by conventional means into a vertical annealing lehr 10. Alternatively the sheet may initially be drawn upwardly and then bent over a roller and drawn horizontally through the annealing lehr (Colburn Process). |
