| 摘要 |
PURPOSE:To improve the reliability of a spacer by a simple process for production by forming a primary coating layer for enclosing tensile wires of an adhesive thermoplastic resin and a spacer body part of a thermoplastic resin having large compatibility with the adhesive thermplastic resin. CONSTITUTION:While the tensile wires 1 are inserted into the 1st cross head die 3, the molten adhesive thermoplastic resin is supplied to the outside periphery thereof to form the primary coating 4 to 0.1-0.5mm thickness, by which a core strand 5 is obtd. The core strand 5 is inserted into the 2nd cross head die 6 having the shape resembling to the sectional shape of the spacer and the thermoplastic resin having the large compatibility with the adhesive thermoplastic resin is supplied in the molten state to the outside periphery of the layer 4 so that the spacer body 8 formed with the spiral optical fiber contg. grooves having projections 7 on the outside periphery is obtd. The simple process for producing the spacer for carrying the optical fibers which has the large joining strength between the spacer body and the tensile wires, obviates the change with environmental temp. decreases the transmission loss of the optical fibers and has high reliability is thus obtd. |
