PROCESS FOR PRODUCING THERMALLY INSULATED PIPING

摘要

In a process for producing thermally insulated piping comprising a metal tube (2), a foamed plastic insulating layer, and an outer sheath (9), the latter is formed from a flexible strip in order to obtain a pipe which can readily be bent for installation, the overlapping edges of this strip being joined by adhesive-bonding. The outer sheath composed of the flexible plastic strip is supported from the outside during the production of the insulating layer. A flexible, closed-cell polyurethane foam is introduced from a nozzle (10). A spacer-helix (7) is applied around the tube (2) before the sheath (9) is added.