| 摘要 |
Thermally insulated pipe, with at least an inner tube (1) and a thermal insulation layer (2) based on polyurethane or polyisocyanurate foam, separated by a film (3) from an outer mantle (4) of thermoplastic material. Thermally insulated pipe, with at least an inner tube (1) and a thermal insulation layer (2) based on polyurethane or polyisocyanurate foam, separated by a film (3) from an outer mantle (4) of thermoplastic material. The film has several layers (3.1, 3.2, 3.3), with at least one layer (3.1) that is impermeable for the blowing agent gas in the foam cells and is bonded to both the layer (3.2) next to the outer mantle (4) and the layer (3.2) next to the insulation layer (2). |
