PRODUCTION DEVICE AND METHOD FOR OPTICAL FIBER

摘要

A wire drawing device (1) has a wire drawing furnace (11), a heating furnace (21) and a resin curing unit (31). An optical fiber (3) heat-drawn in the wire drawing furnace (11) is fed to a heating furnace (21), and a preset portion of the optical fiber (3) is slowly cooled at a preset cooling speed. A heater (22) temperature in the heating furnace (21) is so set that a furnace center temperature is within a range of 1200 to 1600 DEG C. Then, the optical fiber (3) is coated with a UV resin liquid (52) by a coating die (51), and the UV resin (52) is cured at the resin curing unit (31) to form an optical fiber strand (4).