| 摘要 |
The present invention relates to a process for producing insulated pipes, which comprises the steps (A) provision of pipe for a medium and outer pipe, where the pipe for a medium is arranged within the outer pipe and an annular gap having ends E1 and E2 is formed between the pipe for a medium and outer pipe, (B) introduction of a polyurethane system comprising at least one isocyanate component (a) and at least one polyol mixture (b) into the annular gap at the end E1 and (C) foaming and curing of the polyurethane system, wherein the annular gap is closed by means of a cap at the end E2 and this cap has openings having an adjustable size, a cap which has openings having an adjustable size, the use of this cap for producing insulated pipes and also an insulated pipe which can be produced by the above-described process of the invention.
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