Patent ID: 8950071
Filing Date: 2015-02-10
Classification: B29C,F16L,Y10T

Abstract:
1. A method for manufacturing a heat-insulated pipe ( 1 ), comprising the positioning of at least one flexible inner duct ( 3 ) into an outer duct ( 2 ) creating a hollow space between an outer wall ( 6 ) of the inner duct ( 3 ) and an inner wall ( 7 ) of the outer duct ( 2 ) as well as the injecting of foam into the hollow space, characterized in that during the injecting of foam the inner duct ( the tension member comprises a cable ( the centering elements are arranged coaxially to the cable for supporting the inner duct away from the cable, and are spaced from one another by means of fixed spacers ( the tensile force holds the tension member straight so as to provide a straight shape to the inner duct that is supported by the tension member, while being held in this way, such that the inner duct cannot be displaced by a foaming pressure, the inner duct is surrounded with the injected foam, which then fixes together the inner duct with the outer duct to form the heat-insulated pipe, and the tension member is removed from the inner duct after the foaming.