| 摘要 |
PURPOSE:To improve a low-temp. characteristic, productivity and color coding property and further terminating property by forming and integrating a primary coating consisting of a resin having small distortions at the time of coating and a secondary coating consisting of a foamed resin on the outer periphery of a laminate formed by superposing >=1 sheets of coated optical fiber ribbons. CONSTITUTION:This 12-fiber optical fiber unit is constructed by laminating three ribbons of the 4-fiber coated optical fibers 1 consisting of 4 optical fibers 5 and interposing two pieces of intervening cords 2, then forming the primary coating 3 and the secondary coating 4 of the foamed polyethylene thereon. The ribbon structure coated optical fibers 1 are formed by arranging 4 pieces of the optical fibers 5 in one row and integrally coating the fibers with a UV curing resin. The primary coating 3 is formed by extrusion molding of nylon and the secondary coating 4 of the foamed polyethylene of 50% foaming rate. The increase in low-temp. transmission loss is eliminated in this way and the temp. characteristics of the optical fiber unit are stabilized. |
