| 摘要 |
PURPOSE:To obviate cracking in a packing material for preventing running water by packing said material having prescribed mixing consistency between optical fibers thereby permitting packing at a low temp., decreasing the volumetric shrinkage of the packing material and decreasing microbends. CONSTITUTION:Eight pieces of optical fiber core units 1 each formed by gathering six pieces of optical fibers around a tensile member 11 such as a metallic wire and winding a tape 13 for retentive winding are gathered around a tensile member 2 and are covered with a water shielding layer 3 consisting of Al, etc. and an extruded protective sheath layer 4. A packing material 5 having 85-475 mixing consistency at an ordinary temp. measured in accordance with ASTMD- 217 is packed to the inside space of the layer 3. Calcium soap grease, aluminum soap grease, lithium soap grease, compound aluminum soap grease, benton grease, polyurea grease, etc. are used as the packing material. |
