SHEATHING STEEL PIPES WITH AN EXTRUDED SHEATHING LAYER OF THERMOPLASTIC SYNTHETIC MATERIAL

摘要

A steel pipe is jacketed by concurrent extrusion of an ethylene hose concentric with a copolymer hose serving as an adhesive, the pipe passing through the extruder heat at an approximately 10% higher speed. The copolymer is predried, and the pipe is preferably precoated with heat-curable phenol or epoxy.