| 摘要 |
PROBLEM TO BE SOLVED: To provide a method for manufacturing a spacer for an optical fiber cable by which a groove inclination of a spiral groove housing an optical fiber is controlled. SOLUTION: A coated high-tensile wire 4 in which a preliminary coating layer is provided in the outer periphery of a high-tensile body is pre-heated by passing through a heating tank 5, thereafter the wire is introduced into an extruder 7 having a rotating die 6 corresponding to the cross section shape of the spacer, the wire is guided to a cooling zone 9 to cool it after rotating, extruding and coating a spacer main body resin layer at prescribed speed, and whereby a PE spacer 10 is obtained. Three stages of ring shaped air nozzles are set up in the cooling zone 9 along the running direction of the spacer 10. Air is almost orthogonally brown out of the nozzles toward the spacer 10 and is brown against the groove bottom of the spacer 10, and the root part of a rib is cooled preferentially more than the middle part. The spacer 10 is specified by nearly 1.5 mm in the minimum rib thickness at the root of the rib demarcating the spiral groove, 11.9 degrees in the advancing angle and nearly 15 degrees in the groove inclination angleα.
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