| 摘要 |
PROBLEM TO BE SOLVED: To provide a manufacturing method of a coated optical fiber which is provided with a primary coating and a secondary coating on an optical fiber where for the material of the secondary coating which is frame retardant and in case of burning hardly generate halogen gas, and the cut surfaces of the coatings are sharp and beautiful when the primary and secondary coatings are stripped en bloc and coatings of coated fibers are prevented from adhering to each other. SOLUTION: On the outside of elementary optical fiber 3 which is provided with the primary coating 2 of ultra violet curing type resin on optical fiber 1, the secondary coating 4 of flame retardant polyethylene resin which is obtained by adding fire retardant to EEA, etc., is extruded to form coating and successively is irradiated with electron beam of 50-300 kV acceleration voltage by an electron beam irradiator 11.
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