Patent ID: 8568830

Claim:
A method for manufacturing a pipe coated with a peelable protection layer, the method comprising: producing a solid core pipe by extrusion and calibration; heating, after the producing, the solid surface of the core pipe to a predetermined temperature, wherein the speed and effectiveness of the heating is controlled to create a desired degree of adhesion between the core pipe and a protective coating layer; passing the heated solid core pipe through a coating die; applying, during the passing, the protective coating layer to the heated core pipe; controlling the pressure inside the coating die within a range of vacuum pressures such that the pressure causes the coating layer to contact the surface of the core pipe at an angle between 45 to 90 degrees, and cooling the applied coating layer; wherein the welding time and stretching of the coating layer as it is applied to the core pipe is controlled at least in part by the maintaining a vacuum level.