| 摘要 |
PURPOSE:To obtain a bundle of fibers having an excellent strength and a less erosion against a humidity by coating under heating a metal halide polycrystal fiber formed by hot-extruding it using a die having the plural die holes, with a molten resin having an environment resistance, and then by making the bundle of said optical fiber. CONSTITUTION:The hole of the die 4 provided the plural die holes 12 at a rotation symmetry has a circular arcuate shape or a prescribed tapered angle in a cross section. Said die is provided to a container 1, and the preformed crystal 2 of the metal halide is charged into the container 1 and then is extruded under the pressure with a rum 3 to form the plural polycrystal fibers 5. And, then, the fiber 5 is passed into a crucible 8 filled the resin 7 suitable to the reinforcing or the environment resistance, preferably, such as polyethylene, polypropylene, polycarbonate and a fluoro-resin to coat the fiber with said resin, before contacting the fiber 5 with a guide roll 6, thereby heat- curing it in a heating furnace 9. By treating the fiber as mentioned above, the fiber 5 easy to erode to the humidity and easy to break, is coated with the resin and then cured so as to give an excellent strength and environment resistance, thereby obtaining the titled fiber having a good durability and a less transmission loss. |
