METHOD OF MANUFACTURING COAXIAL CABLE HOLLOW CORE BODY, COAXIAL CABLE HOLLOW CORE BODY, AND COAXIAL CABLE

摘要

PROBLEM TO BE SOLVED: To manufacture a hollow core body for a coaxial cable with a high hollow rate and with stabilized electrical characteristics in a longitudinal direction.;SOLUTION: The hollow core body for coaxial cable is equipped with an inner conductor, an insulated covered body including an inner annulation portion to cover the inner conductor, a plurality of rib portions radially extending from the inner annulation portion, an outer annulation portion with an outer diameter of 0.5 mm or less and connecting outer edges of the rib portions, a plurality of hollow portions surrounded by the inner annulation portion, the outer annulation portion, and the rib portions. An area percentage occupied by the hollow portions in the total insulated portion area is 40% or more, and a roundness of the outer annulation portion is 96.0% or more. A method of manufacturing the hollow core object for the coaxial cable includes at least the following (1) to (3) processes: (1) a process of using a die to form the insulated covered body and to extrude molten resin from the die (2) a process of heating resin to form the insulated covered body, and (3) a process of gradually cooling the resin to form the insulated covered body at around the room temperature.;COPYRIGHT: (C)2010,JPO&INPIT