METHOD OF MAKING PUSH-PULL CABLE CONDUIT AND PRODUCT

摘要

Abstract of the DisclosureA push-pull cable conduit is made by continuouslymoving a tubular mandrel through a crosshead extruding die,forming n tape of micro-porous polytetrafluoroethylene resininto cylindrical form covering the mandrel as it enters theextruding die, extruding an outer layer of fluid polymericmaterial over the cylindrical covering in the presence ofheat, helically wrapping contiguous wires over said outerlayer to form a wire layer, extruding an outer covering ofthermoplastic material over the wire layer, and removing thetubular mandrel. The porosity of the polytetrafluoroethylenecovering insures a good heat bond with the outer layer offluid polymeric material and also provides a lubricant reser-voir in its inner surface, thereby minimizing friction withthe cable core and greatly reducing sound transmission.