| 摘要 |
In apparatus for producing glass tubing by drawing molten glass from an annular opening, at least one air induction device is provided for cooling the hot glass tubing, the air induction device being arranged to induce a flow of atmospheric air by means of a smaller flow of air under pressure and to direct the flow of atmospheric air over the external surface of the hot glass tubing. The air induction device comprises a venturi-shaped nozzle which is disposed substantially co-axially with the path of the hot glass tubing. |
