| 摘要 |
The present invention relates to a continuous process for producing an insulated pipe comprising at least one medium pipe, an outer pipe, a layer of at least one polyurethane between the at least one medium pipe and outer pipe and a film tube between the at least one polyurethane and the outer pipe, which comprises at least the steps (A) provision, in a jaw band, of at least one medium pipe and a film tube formed continuously from a film, where the at least one medium pipe is arranged within the film tube in such a way that a gap is formed between the at least one medium pipe and the film tube, (B) introduction of a polyurethane system comprising at least one isocyanate component (a) and at least one polyol (b) into the gap, (C) foaming and allowing to cure of the polyurethane system and (D) application of a layer of at least one material to the film tube in order to form the outer pipe, where the polyurethane system has thixotropic properties. |
