TENSILE STRENGTH BODY AND SPACER FOR OPTICAL FIBER CABLE, AND MANUFACTURE THEREOF

摘要

PROBLEM TO BE SOLVED: To avoid stress lowering at the time of 0.2% elongation. SOLUTION: This spacer 10 is provided with a tensile strength body 15 arranged in its central part, a first precoat layer 16, a second precoat layer 17 and a third precoat layer 18 provided respectively in an outer circumference of the tensile strength body 15, and a spacer main body coating 20 provided in an outer circumference of the third layer 18. The tensile strength body 15 has a fiber-reinforced synthetic resin rod 12, and a primary coating layer 14 for coating an outer circumference of the rod 12. A PBO(poly-benzbis-oxazole) fiber having a high tensile elastic modulus is used as a reinforcing fiber in the rod 12. A volume content of the PBO reinforcing fiber is made 50% or more. A cross-sectional area of the precoat layers 16, 17, 18 is made larger than that of the fiber-reinforced synthetic resin rod 12. An elastic modulus of the spacer 10 keeps 80% or more of the tensile elastic modulus inherent to the PBO reinforcing fiber.