| 摘要 |
<p>Molten glass 1 flows continuously from a glass melting furnace 2 to a drawing tank 7 whence the glass is drawn as a continuous ribbon 10 from a slot 11 in a refractory device 12 such as a debiteuse partially immersed in the molten glass. The centre of the slot 11 is spaced from each of upstream 6 and downstream 9 end walls of the drawing tank 7 by at least 550 mm. The debiteuse 12 is preferably spaced from those walls by at least 350 mm. This promotes and facilitates production of a high yield of glass of a high standard of thickness uniformity and of good planeity. These advantages are enhanced when the ribbon is passed over a bending roll 13 in a drawing chamber 8 above the drawing tank 7 and thence to a horizontal annealing lehr 14. <IMAGE></p> |
