OPTICAL FIBER WIRE DRAWING FURNACE

摘要

PURPOSE:To make it possible to prevent leakage of heat by arranging a reflecting sheet between a heater arranged around periphery of a furnace core tube and heat resistant heat-insulating material arranged in the periphery of the heater. CONSTITUTION:A heater 3 is arranged in the periphery of a furnace core tube 2 of an optical fiber drawing furnace and a heat-resistant heat-insulating material 4 is arranged in the periphery of the heater 3. Then a single or multiple reflecting sheet 13 consisting of a heat resistant material such as tungsten is arranged between the heater 3 and heat insulating material 4. Then the optical fiber preform 1 is inserted into the furnace core tube 2 and a heater 3 is heated to about 1670 deg.C by applying electricity between conductors 14 and 15 and the preform 1 is drawn to produce the optical fiber 12. On the other hand, heat leakage from the furnace to the outside is prevented to save energy.