| 摘要 |
PURPOSE:To apply a dense coating layer to the surface of an optical fiber, by applying a coating material through rotating roll dies to the surface of the optical glass fiber, and passing the coated optical fiber through a fixed die. CONSTITUTION:A quartz type base material 1 is fed to a wire drawing furnace 2 and hot molten to give an optical glass fiber 3, which is then fed to a gap between a pair of roll dies 4 having a semicircular groove and coated with a coat ing material fed from a feeding apparatus 5 while rotating the dies 4. The coated optical glass fiber 3 is then passed through a fixed die 6 to recover the excess coating material in an overflowing solution resevoir 7. The fiber 3 is then passed through a baking furnace 8 to harden the coating material under heating. The fiber 3 is taken off by a taking off machine 10 and wound onto a bobbin 11. Thus, all the multilayered coating layers are uniformly formed from coating material prepared from different materials. |
