| 摘要 |
Process for the manufacture of an elongated, multilayered tubular body (1 ) comprising an elongated, tubular inner hollow core (5), optionally an elon gated, tubular inner casing (4) and an elongated, tubular outer casing, the inner casing, when present, surrounding the hollow core, the outer casing su rrounding the inner casing, when present, or otherwise the hollow core, the outer casing comprising at least two layers (2, 3), each layer consisting of one or more longitudinally preformed, flat elongated metal strips, the pref orming of the strips such that the strips have been bent helically in such a way that the consecutive windings of the helix or helices touch or almost t ouch to each other, each strip in one layer overlapping with other strips in other layers, the layers in the outer casing being bound to each other by a n adhesive.
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