| 摘要 |
PURPOSE:To prevent the fracture, microbending, etc., of an element wire and to improve flexure characteristics by bringing a fiber-reinforced resin layer formed around the outer circumference of the element wire and a thermoplastic resin coating layer arranged around its outer circumference into contact integrally by anchor effect. CONSTITUTION:The layer 22 of the fiber-reinforced thermosetting resin (FRP) is formed around the outer circumference of the optical fiber element wire 2, and the layer 8 of thermoplastic resin (TP) is arranged around the outer circumference of the FRP layer 22; and the coating layer 8 and FRP layer 22 are brought into contact integrally by the anchor effect. Namely, a reinforcing fiber bundle 4 impregnated with thermosetting resin (TR) in an unset state is arranged around the outer circumference of the element wire 2 and coated with TP, and then a heat treatment is carried out after temporary cooling to bring the FRP layer 22 and TP layer 8 into contact integrally by the anchor effect simultaneously with the setting of the TS. Consequently, the TP layer 8 serves as a die which sets the internal FRP layer 22 while holding it in a specific shape, and prevents the breaking of the wire by protecting the element wire 2 against high tensile force. Further, the FRP layer 22 and TP layer are brought into contact by the heat treatment to improve the flexure characteristics and to increase the coating speed. |
