Protective tubular member for automotive control wire and manufacturing method therefor

摘要

A protective tubular member for an automotive control wire includes a hollow tubular member made of a synthetic resin and a protective film layer joined integrally to the hollow tubular member. The protective film layer is provided with a rough surface portion having irregularities on the exposed surface of the protective film layer. A manufacturing method for the protective tubular member includes the steps of pouring and melting a mixture for the protective film layer, formed of a base material and an additive material, in a first extrusion molding machine, pouring and melting a synthetic resin for the hollow tubular member in a second extrusion molding machine, operating the first and second extrusion molding machines at the same time, polymerizing and jointing integrally the mixed resin in the first extrusion molding machine and the synthetic resin in the second extrusion molding machine in a die by heat and pressure, and forming a rough surface portion with irregularities on the exposed surface of the protective film layer due to the grains and particles of the additive material.