| 摘要 |
Methods and apparatuses are disclosed for exhausting reaction products from an optical fiber preform tube and for choking off the preform tube during collapse wherein an exhaust tube (40) is provided with an entry end (41) located adjacent and in fluid communication with a downstream end (10') of a preform tube (10), suction applied to the exhaust tube (40), and a stream of reaction product agitating gas free of reaction products introduced into the exhaust tube (40) at a location adjacent the exhaust tube entry end (41). |
